CN202403044U - LED (Light-Emitting Diode) explosion-proof lamp - Google Patents

Abstract

The utility model relates to an LED explosion-proof lamp, which is composed of an LED light source, a lens, a radiator and a driving circuit. The inner surface of the lens is a light incident surface, which is a hemispherical surface. The outer surface is a light exit surface, which is composed of a central area, a protection area and a connection area. The curved surfaces of the central area and the protection area are free-form surfaces, and the connection area is a conical surface connecting the central area and the protection area. Compared with LED explosion-proof lamps without cut-off treatment, it not only significantly reduces the adverse effects of glare on vision, but also increases the total luminous flux output within the cut-off angle range. When the cut-off angle is 70 degrees, It can be increased by 12%, and when the cut-off angle is 60 degrees, it can be increased by 25%. Compared with LED lamps that use reflectors to cut off light, the light distribution element and lampshade of the LED explosion-proof lamp disclosed in the utility model are combined into one , compact structure, high total luminous flux output in the cutoff angle range.

Description

LED explosion-proof lamps

technical field

The utility model relates to a lamp with an LED as a light source, in particular to an explosion-proof LED lamp which can meet the light cutting requirement.

Background technique

LED is a solid-state light source, which uses DC power supply, has the advantages of high luminous efficiency, long life and small size, and is an ideal light source. In the design of LED lamps, heat dissipation and light distribution are two key issues that need to be solved.

LEDs are sensitive to temperature. As the junction temperature rises, the luminous efficiency of LEDs will decrease significantly, and the service life will also be significantly shortened. The design schemes of the currently disclosed LED explosion-proof lamps generally use heat sinks or heat pipes to achieve heat dissipation, and the structure and size of the radiator need to be reasonably designed according to the power of the lamp and the protection and explosion-proof requirements.

The brightness of the LED light source is high, and the light intensity of the LED without a lens or the LED using a spherical lens is approximately a cosine distribution in the space of 2π. Compared with traditional light sources, the solid angle of light radiation of LED light sources is smaller, which is conducive to improving the utilization rate of luminous flux. However, in order to obtain the desired luminosity distribution on the illuminated surface more efficiently, it is still necessary to use non-imaging optical technology to design a reasonable illumination optical system.

Generating uniform illumination on the illuminated surface is one of the basic requirements for luminaire design. Invention patents ZL 200610113463.4, 200910022409.2, and 200910046129.5 disclose the design method of lenses that can form rectangular spots. Such optical systems can be used in road lighting fixtures. Each lamp can independently produce uniform illumination on the road surface. Invention patent 200910099552.1, utility model ZL 200720047134.4 and CN 201521855U disclose the design method of an LED lens that can form a circular uniform lighting spot, which can be used for downlights, miner's lamps and table lamps. The optical design of the above-mentioned LED lamps is aimed at the independent lighting of a single lamp. In workshops, offices and warehouses where the lighting area is large and the illumination requirements are high, it is usually necessary to use multiple lamps to provide sufficient luminous flux. The luminosity distribution is the result of superimposed lighting of multiple lamps. LED lamps that can produce uniform lighting alone, when distributed, the effect of superimposed lighting may not be able to meet the requirements of uniformity.

In some occasions, there is a requirement for cut-off lamps. LED light sources with approximate cosine distribution have lower light intensity in areas with larger aperture angles, but they still cannot meet the technical requirements for cut-off lamps. If no shading treatment is carried out, it will not only easily cause visual discomfort, but may also become a safety hazard.

In terms of light distribution, the disclosed design methods of LED explosion-proof lamps can be divided into four types: 1) using reflectors for light distribution (such as CN 201731301U); 2) using spherical lenses for light distribution (such as CN 201615372U); 3) using The installation position of the LED realizes the light distribution (such as CN 201715291U); 4) Use the light distribution mirror for light distribution (CN 201615372U). The method of using reflector light distribution improves the illuminance of the target area by reducing the illumination range. The larger the solid angle covered by the reflector, the more obvious the effect of changing the light intensity distribution, but the light energy loss caused by the reflector will also increase accordingly. The method of using a spherical lens can adjust the light intensity distribution to a certain extent, but it may cause the boundary line between the illuminated area and the non-illuminated area to be too obvious, thereby affecting the uniformity of the superimposed illumination of multiple lamps. Installing LEDs on the surface of the polyhedron can expand the lighting range of the lamp. However, the structure of the lamp is relatively complicated, which increases the difficulty and cost of manufacture, and at the same time causes the problem of glare. The surface of the light distribution mirror is composed of cylinders with different radii or wedges with different angles, which can change the optical path and obtain the required light intensity distribution. Due to the complex surface structure, large machining errors are likely to occur at the joints between cylindrical surfaces or wedge surfaces, which will cause stray light and cause a certain degree of light energy loss.

Contents of the invention

The utility model is to provide an explosion-proof LED lamp, which is suitable for occasions requiring combined lighting of multiple lamps. The light distribution is realized by using a light-cutting non-imaging lens, which can meet the requirements of explosion-proof and light-cutting, and has a high uniformity of illumination and light utilization.

In order to achieve the above purpose, the technical solution adopted by the utility model is: an LED explosion-proof lamp, which is composed of an LED light source, a lens, a heat sink, and a driving circuit. The center is placed at the center of the spherical surface of the lens; the outer surface of the lens is the light exit surface, which is composed of three parts: the central area, the protection area and the connection area. The conical face of the protected area.

The plane opening angle of the center of the light emitting surface of the LED light source to the central area of the lens outer surface is α, and the plane opening angle to the protection area 104 is β=π/2-α, where α is the cutoff angle.

The normal direction of any point on the surface of the two parts of the lens central area and the protection area satisfies: under the condition of ignoring the absorption loss of the lens material and the interface reflection loss, the luminous flux emitted by the LED light source in the Ω1 solid angle and the output through the lens in the Ω2 solid angle The luminous flux is equal, where the Ω1 solid angle corresponds to the aperture angle of the incident light is θ1, and the Ω2 solid angle corresponds to the aperture angle of the refracted light is θ2; 0≤θ2≤α, the light intensity of the lamp in the θ2 direction is determined by the light distribution requirements.

The radiator is a blade-type radiator, which consists of a cylindrical mandrel and a number of heat sinks evenly distributed on the outer cylindrical surface of the cylindrical mandrel. The busbar of the heat sink is parallel to the center line of the cylindrical mandrel, and the cylindrical mandrel The LED light source and the lens are installed below, the lens is sealed and connected with the cylindrical mandrel through the pressure ring and the sealing ring, and the power line of the LED light source is connected to the driving circuit through the through hole in the cylindrical mandrel.

The drive circuit is installed in the electrical box. The electrical box is composed of the upper cover, the box body, the sealing gasket and the connecting piece. The driving circuit is placed in the box. The upper end of the box body is fixedly connected to the upper cover, and the lower end is fixed and sealed with the heat sink by the sealing gasket and connecting piece. connect.

The LED light source in the LED explosion-proof lamp is a single high-power integrated packaged LED light source or multiple single-chip independently packaged LED light sources or multi-chip integrated packaged LED light sources, and each LED light source is equipped with a lens.

The lens is a transparent protective cover for LED explosion-proof lamps, which is used to isolate LED lamps and their power supply circuits from explosive environments.

The beneficial effects of the utility model are: 1) It can meet the technical requirements of cut-off lamps; 2) In the case of using multiple lamps at the same time, it can form a lighting effect with high uniformity on the illuminated surface; 3) Only use lenses Light distribution is realized, and the lens is also used as a lampshade, so the structure is simple, and the light energy transmission loss of the optical system is also small. At the same time, the light emitted by the light source is gathered within the cutoff angle range, so that the light energy can be fully utilized. Compared with the LED explosion-proof lamps without cut-off treatment, the LED explosion-proof lamps disclosed in the present invention not only significantly reduce the adverse effects of glare on vision, but also increase the total luminous flux output within the range of cut-off angles. When the light angle is 70 degrees, it can be increased by 12%, and when the cut-off angle is 60 degrees, it can be increased by 25%. Combined with the lampshade, the structure is relatively compact, and the total luminous flux output within the cutoff angle range is also high.

Description of drawings

Fig. 1 is a structural cross-sectional view of a light-cutting lens of the present invention;

Fig. 2 is a structural cross-sectional view of a light-cutting lens of the present invention with an integrated base;

Fig. 3 is the light path figure of the utility model optical system;

Fig. 4 is a schematic diagram of calculating the center area of the outer surface of the light-cutting lens and the curved surface of the protection area of the utility model;

Fig. 5 is the figure of luminous intensity distribution curve (i.e. light distribution curve) of the present utility model, wherein, figure (a) is the light distribution curve that is evenly distributed in the cutoff angle range, and figure (b) is the light distribution curve in the cutoff angle range Light distribution curve with cosine distribution inside;

Fig. 6 is a structural sectional view of the utility model using a single LED light source;

Fig. 7 is a three-dimensional schematic diagram of the structure of the utility model using multiple LED light sources;

Figure 8 is a schematic diagram of the illuminance distribution using four LED lamps to illuminate the illuminated surface;

Fig. 9 is a schematic diagram of illuminance distribution using twelve LED lamps to illuminate the illuminated surface.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

As shown in Figures 6 and 7, the LED explosion-proof lamp of the present invention uses LED as the light source, and can use a high-power LED light source 1 packaged with multi-chip integration, or multiple LEDs with single-chip independent packaging or multi-chip integrated packaging. light source. Each LED light source 1 is equipped with a lens 2, the inner surface of the lens 2 is the light incident surface 101, which is a hemispherical surface, as shown in FIG. The outer surface of the lens 2 is a light-emitting surface, which is divided into three parts: the central area 102, the protection area 104 and the connection area 103, wherein the central area 102 and the protection area 104 are free-form surfaces, and the connection area 103 is for connecting the central area 102 and the protection area. The conical surface of zone 103.

The curved surfaces of the central area 102 and the protected area 104 of the outer surface of the above-mentioned lens 2 are obtained through point-by-point calculation according to the light distribution requirements, and respectively refract light rays within different solid angle ranges. The light distribution requirements include limiting the light emitted by the LED light source 1 within the range of the solid angle Ω corresponding to the cutoff angle α, and within the range of the solid angle Ω, the light intensity of the lamp satisfies a specific distribution (Figure 3). When a plurality of lamps are used to illuminate an area at the same time, the specific light intensity distribution can make the illuminance or brightness uniformity in the illuminated area meet the requirements. According to the above light distribution requirements, the angle coverage ranges of the central area 102 and the protection area 104 on the outer surface of the lens are firstly determined. 

112满足以下条件：设入射光线的孔径角为θ1，对应的Ω1立体角110；折射光线的孔径角为θ2，对应的Ω2立体角111，则在Ω1立体角110中由LED光源1发出的光通量和Ω2立体角111中经透镜2输出的光通量相等；0≤θ2≤α，灯具在θ2方向的光强由配光要求确定。最后通过绕主光轴旋转L1，L2母线113，114得到透镜2外表面的中心区102和保护区104曲面。 As shown in Figure 1, if the cut-off angle is α, the center of the light-emitting surface of the LED light source 1 has a plane angle to the central area 102 of α, and the plane angle β to the protected area 104 is equal to π/2-α. Then The L1 generatrix 113 and the L2 generatrix 114 of the curved surface of the central area 102 and the protection area 104 on the outer surface of the lens 2 are respectively calculated, as shown in FIG. 4 . The calculation of the bus line starts from a specific starting point, which is determined according to the radius of the inner surface of the lens and the thickness of the lens, and the subsequent points are sequentially calculated according to the normal direction at each point. normal at each point

112 satisfies the following conditions: if the aperture angle of the incident light is θ1, the corresponding Ω1 solid angle is 110; It is equal to the luminous flux output by the lens 2 in the Ω2 solid angle 111; 0≤θ2≤α, the light intensity of the lamp in the θ2 direction is determined by the light distribution requirements. Finally, the curved surfaces of the central area 102 and the protected area 104 of the outer surface of the lens 2 are obtained by rotating the L1 and L2 generatrices 113 and 114 around the main optical axis.

For ease of installation, an integrated base 105 can be added to the lower part of the lens 2, and the base 105 can adopt a structural form such as a hollow cylinder that is convenient for linking with other parts, as shown in FIG. 2 .

The lens 2 is also used as a light-transmitting lampshade for the lamp. In occasions where explosion-proof requirements are high, the lens is made of glass material and tempered. In occasions where the explosion-proof requirements are lower, the lens can be made of PMMA or PC material.

LED explosion-proof lamps use blade type radiator 3. Structurally, the radiator 3 is composed of a cylindrical mandrel and radial fins evenly distributed on the outer cylindrical surface of the mandrel, and the generatrices of the radiating fins are parallel to the centerline of the mandrel (Figure 6). The LED light source 1, the lens 2, the pressure ring 9 and the sealing ring 8 are installed on the lower end surface of the radiator mandrel. There is a through hole in the mandrel, and the power line of the LED light source 1 is connected to the driving circuit 6 through the through hole.

The power drive circuit 6 of the LED explosion-proof lamp is installed in the electrical box. The electrical box is composed of an upper cover 5, a box body 4, a sealing gasket 7 and connectors, etc., and a sealing gasket 7 is set at the connection between the radiator 3 and the electrical box (Fig. 6). Both the radiator 3 and the electrical box are made of aluminum alloy with good thermal conductivity, so that the heat generated by the LED light source 1 and the driving circuit 6 can be conducted to the outside of the lamp in time.

The structural dimensions of the radiator 3 and the electrical box are mainly determined according to the power and packaging form of the LED light source 1. Figure 6 and Figure 7 respectively show the structure of an explosion-proof lamp using a single integrated package LED and the structure of an explosion-proof lamp using multiple LEDs .

Further illustrate the implementation method of the present utility model by example below.

Example 1: It is required to illuminate a square area, and the uniformity of illuminance within the range of L meters × L meters in the middle of the lighting area is greater than 0.75, and the cut-off angle of the lamp is 65 degrees. According to lighting requirements, four LED explosion-proof lamps are used with an interval of L meters. The lamps adopt uniform light intensity distribution. The light distribution curve is shown in Figure 5a. The lens shape obtained according to the light intensity distribution is shown in Figure 1. As shown in Figure 8. Within the solid angle range corresponding to the cutoff angle of 65 degrees, the luminous flux output by the lamp reaches 92% of the total luminous flux of the light source.

Example 2: It is required to illuminate a rectangular area, the illuminance uniformity is greater than 0.7 in the range of L meters × W meters in the middle of the lighting area, and the cut-off angle of the lamp is 70 degrees. According to the lighting requirements, use N pieces of LED explosion-proof lamps with an interval of D meters, and arrange them in m rows and n columns, n=INT (L/D), m=INT (W/D), and the light intensity of the lamps within the cut-off angle According to the cosine distribution, the light distribution curve is shown in Figure 5b, the lens shape obtained according to the light intensity distribution is shown in Figure 1, and the obtained lighting effect is shown in Figure 9. Within the solid angle range corresponding to the cutoff angle of 70 degrees, the luminous flux output by the lamp reaches 92% of the total luminous flux of the light source.

The lens of the LED explosion-proof lamp of the present invention can also be used for other types of LED lamps.

Claims (7)

1. LED explosion-proof lamp; Form by led light source (1), lens (2), radiator (3), drive circuit (6); It is characterized in that: said lens (2) inner surface is light incidence surface (101); Be hemisphere face, the center of led light source (1) light-emitting area places the centre of sphere of lens (2) sphere; Lens (2) outer surface is the beam projecting surface; Form by center (102), protection zone (104) and bonding pad (103) three parts; Wherein, Center (102) and protection zone (104) curved surface are free form surface, and bonding pad (103) curved surface is for connecting the taper seat of center (102) and protection zone (104).

2. LED explosion-proof lamp according to claim 1; It is characterized in that: the center of said led light source (1) light-emitting area is α to the plane subtended angle of lens (2) outer surface centers (102); To the plane subtended angle β=pi/2-α of protection zone (104), wherein, α is the cutoff angle degree.

3. LED explosion-proof lamp according to claim 1; It is characterized in that: the normal direction of the center of said lens (102) and two parts curved surface arbitrfary point, protection zone (104) satisfies: the luminous flux through lens (2) output in luminous flux that in Ω 1 solid angle (110), is sent by led light source (1) and Ω 2 solid angles (111) equates; Wherein, The angular aperture of the corresponding incident ray of Ω 1 solid angle (110) is θ 1; The angular aperture of the corresponding refracted ray of Ω 2 solid angles (111) is θ 2, and 0≤θ, 2≤α.

4. LED explosion-proof lamp according to claim 1; It is characterized in that: said radiator (3) is the blade type radiator; Form by cylindrical mandrel and the several cooling fins that is evenly distributed on the cylindrical mandrel external cylindrical surface; The bus of fin is parallel with the center line of cylindrical mandrel; Led light source (1) and lens (2) are installed below the cylindrical mandrel, and lens (2) are tightly connected with cylindrical mandrel through trim ring (9) and sealing ring (8), and led light source (1) power line connects drive circuit (6) through the through hole in the cylindrical mandrel.

5. LED explosion-proof lamp according to claim 1; It is characterized in that: said drive circuit (6) is installed in the electric appliance box; Electric appliance box is made up of loam cake (5), casing (4) and seal washer (7) and connector; Place drive circuit (6) in the casing (4), casing (4) upper end is fixedly connected loam cake (5), and the lower end is with seal washer (7) and connector and fin (3) fixed seal connection.

6. LED explosion-proof lamp according to claim 1; It is characterized in that: the led light source (1) in the said LED explosion-proof lamp is the led light source or the integrated encapsulated LED light source of multicore sheet of single high-power integrated encapsulated LED light source or a plurality of single-chip individual packages, and each led light source (1) configuration lens (2).

7. LED explosion-proof lamp according to claim 1 is characterized in that: said lens (2) are the transparent protective shield of LED explosion-proof lamp, are used for LED lamp and power supply circuits thereof and explosive atmosphere and isolate.

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