A kind of passive fan structure light fixture
Technical field
The utility model relates to LED lamp technical field, is specifically related to a kind of passive fan structure light fixture.
Background technology
LED lamp adopts LED chip as light source body, but LED chip operationally its junction temperature can have influence on its light efficiency largely, so the heat dissipation design of LED lamp seems very important, current prior art adopts this mode of interpolation radiating fin to dispel the heat usually, and this mode can cannot be affected the effect of heat radiation under air flows inviolent environment by taking away in time because of thermal current, so need to design a kind of light fixture that initiatively can produce air flowing increase radiating effect.
And for example utility model patent, a kind of fan-type LED disclosed in number CN202915139U, it comprises cylindrical shell, radiator, LED, reflector and fan; Be installed with radiator in the upper end of cylindrical shell, at cylindrical shell internal fixtion, reflector and LED be installed, be fixed with mount pad in the side of radiator, mount pad is installed with the fan of wind direction towards radiator.But the problem that the heat radiation that the heat that still cannot solve LED lamp generation of this utility model cannot be produced by taking away in time is bad.
Prior art just simply arranges radiator, or the fin arrangement on design radiator forms heat dissipation wind channel, this method can play certain acceleration radiating effect when air flows violent around, but radiating effect is very not obvious, because air flowing is generally directed, and radiator necessarily has the position of air flowing dorsad, the heat that these positions produce just cannot be taken away by air flowing and accumulate, cause localized heat potential difference, to the life of LED, light efficiency promotes can not play great effect.And the utility model devises directed acceleration air channel, and air channel is perpendicular to radiator surface, the direction that design and the heat of this heat dissipation wind channel conduct on radiator is identical, and it is identical with the protrusion direction of the radiating fin of radiator, the dead angle of heat radiation would not be had like this, can better take advantage of a situation simultaneously and heat directly discharged above radiator.
Also there is prior art that simply fan cooling is set, this mode equally can because of heat dissipation wind channel itself through rigorous design, and cause the wind-force agency part of fan extremely to limit to, take away not in time to heat, radiating effect is caused to decline, and fan of the present utility model is arranged on air stream outlet goes out, the rotation of fan is driven by the flowing of thermal current, the speed of rotation is maintained by the inertia of fan itself, under such design, fan is not dispel hot body, but the heat produced by radiator discharges housing along the direction of heat flow, this mode meets the principle of heat trnasfer, the due effect of fan can better be played.
The utility model has the advantage of good heat dissipation effect.
Utility model content
The utility model provides the rate of outflow being accelerated loose thermogenetic air-flow by design shell moulding, utilizes this air-flow to drive a kind of passive fan structure light fixture of fan turns improving radiating effect simultaneously.
In order to achieve the above object, the utility model adopts following technical scheme: comprise lens, light source substrate, radiator and housing, described lens are connected with light source substrate, described light source substrate is connected with described radiator, the another of described radiator is connected with described housing with side, the inner hollow of described housing forms the gas channel flowed for thermal current from bottom to top, described housing comprises being arranged at and produces the end of thermal current from described radiator, for docking described radiator and coordinating the connection air duct sections being formed and pass into cold airflow and dispel the heat with described radiator, be arranged on described connection air duct sections along the front end on thermal current ascent direction, for accelerating the air-flow accelerating sections of thermal current flow velocity and being arranged on the air stream outlet of described air-flow accelerating sections along the front end on thermal current acceleration flow direction, the radiator fan transferring improving radiating effect at thermal current one way flow effect backspin is provided with in described air stream outlet.The utility model is by improving the mode of enclosure interior air current flow to the structural design of lamp casing, the heat that light fixture is shed accelerates to send lamp casing under the effect of air-flow accelerating sections, and cold air reinforcement radiating effect can be sucked simultaneously, the radiator fan being arranged on top then can rotate under the effect of air-flow perpendicular flow accelerates sending of thermal current, and the temperature of reduction case top increases the temperature difference inside and outside housing further.
Preferred as one, multiple joint pin for connecting described radiator is provided with in described housing, the length that described joint pin gives prominence to the side wall lower ends edge portions of described housing is identical with the height of the radiating fin be arranged on described radiator, the top of the compartment between described radiating fin is connected with described air-flow accelerating sections, forms when the work of described radiator because cool exterior air to be sucked the cold airflow passage of described air-flow accelerating sections by the air current flow of inside and outside cold and hot temperature difference generation.Such design can prevent cold airflow convection current in the horizontal direction, and cold airflow along with thermal current upwards accelerates flowing together after entering housing, can be accelerated the heat exchange on radiator surface, improve the efficiency of heat radiation.
Preferred as one, the radial section area of described air-flow accelerating sections on thermal current flow direction reduces gradually.
Preferred as one, the area of the radial section foremost of described air-flow accelerating sections on thermal current flow direction is identical with the area of the radial section of described air stream outlet on thermal current flow direction.
Preferred as one, the radial section of described air-flow accelerating sections on thermal current flow direction is by circle gradually to rectangular transition, and area of section reduces gradually.
Preferred as one, described air-flow accelerating sections gives prominence to the edge carrying out cross section of described radiator on thermal current flow direction near the radial section edge of described radiator end, ledge coordinates the radiating fin of described radiator to form the air-flow guide part that cold airflow is inwardly above flowed.
Preferred as one, the radial section of described air-flow accelerating sections on thermal current flow direction is circular or rectangle.
Preferred as one, the radial section of described air stream outlet on thermal current flow direction is circular or square.
Preferred as one, the fan blades angle of inclination of described radiator fan is 20 ° ~ 45 °.The radiator fan that the utility model is arranged does not have active drive power, rotate power from the thermal current by air stream outlet, and the power that thermal current can produce is not very large, so then rotary resistance is too large when being arranged on more than 45 ° at the angle of inclination of fan blades, rotating effect is very poor, and also can export and affect radiating effect by barrier air; If when being arranged on below 20 ° at the angle of inclination of fan blades, the stress surface of fan blades is too little, and rotating effect is very poor equally.
Preferred as one, the top place of described radiator fan is provided with the link be connected with center rotating shaft at edge, described link be less than 1/3 of the area of the radial section of described air stream outlet on thermal current flow direction with the summation of described casing center axes normal side lateralarea.When lateralarea link being blocked air stream outlet side is arranged on less than 1/3 of air outlet area of section air-flow by time resistance can reduce, radiating effect would not be had influence on because of will fan be set up like this.
To sum up, the utility model has the following advantages:
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model embodiment;
Fig. 2 is the decomposition texture schematic diagram of the utility model embodiment;
1-lens, 2-light source substrate, 3-radiator, 4-housing, 5-radiator fan, 6-cold airflow passage, 401-connect air duct sections, 402-air-flow accelerating sections, 403-air stream outlet, 404-joint pin, 501-link.
Detailed description of the invention
Below in conjunction with accompanying drawing, with embodiment, the utility model is described in further detail.
As shown in Figure 1 to Figure 2, the present embodiment comprises lens 1, light source substrate 2, radiator 3 and housing 4, lens 1 are connected with light source substrate 2, light source substrate 2 is connected with radiator 3, the another of radiator 3 is connected with housing 4 with side, wherein light source substrate 2 adopts aluminium base, and light source adopts single low-power light source array arrangement design simultaneously.The inner hollow of housing 4 forms the gas channel flowed for thermal current from bottom to top, housing 4 comprises being arranged at and produces the end of thermal current from radiator 3, for docking radiator 3 and coordinating the connection air duct sections 401 being formed and pass into cold airflow and dispel the heat with radiator 3, be arranged on and connect air duct sections 401 along the front end on thermal current ascent direction, for accelerating the air-flow accelerating sections 402 of thermal current flow velocity and being arranged on the air stream outlet 403 of air-flow accelerating sections 402 along the front end on thermal current acceleration flow direction, the radiator fan 5 transferring improving radiating effect at thermal current one way flow effect backspin is provided with in air stream outlet 403.
As shown in Figure 1 to Figure 2, joint pin 404 is cylindrical protrusions structure for connecting the joint pin 404 of radiator 3 to be provided with four in the present embodiment housing 4, is provided with screw in order to coordinate fastening with the screw on radiator with radiator contact surface.The length that joint pin 404 gives prominence to the side wall lower ends edge portions of housing 4 is identical with the height of the radiating fin be arranged on radiator 3, the top of the compartment between radiating fin is connected with air-flow accelerating sections 402, forms when radiator 3 works because cool exterior air to be sucked the cold airflow passage 6 of air-flow accelerating sections 402 by the air current flow of inside and outside cold and hot temperature difference generation.Air-flow accelerating sections 402 gives prominence to the edge carrying out cross section of radiator 3 on thermal current flow direction near the radial section edge of radiator 3 end, ledge coordinates the radiating fin of radiator 3 to form the air-flow guide part 7 that cold airflow is inwardly above flowed.
As shown in Figure 1 to Figure 2, the radial section area of the present embodiment air-flow accelerating sections 402 on thermal current flow direction reduces gradually.The area of the radial section foremost of air-flow accelerating sections 402 on thermal current flow direction is identical with the area of the radial section of air stream outlet 403 on thermal current flow direction.The radial section of air-flow accelerating sections 402 on thermal current flow direction is by circle gradually to rectangular transition, and area of section reduces gradually.The radial section of air-flow accelerating sections 402 on thermal current flow direction also can be simple circle or simple rectangle and without transition.The radial section of air stream outlet 403 on thermal current flow direction is square, so just can coordinate common fan part universal design.
As shown in Figure 1 to Figure 2, the fan blades angle of inclination of the present embodiment radiator fan 5 is 30 °.The radiator fan 5 that the present embodiment is arranged does not have active drive power, the power rotated from by the thermal current of air stream outlet 403, and the power that thermal current can produce is not very large, so then rotary resistance is too large when being arranged on more than 30 ° at the angle of inclination of fan blades, rotating effect is very poor, and also can export and affect radiating effect by barrier air; If when being arranged on below 30 ° at the angle of inclination of fan blades, the stress surface of fan blades is too little, and rotating effect is very poor equally.The top place of radiator fan 5 is provided with the link 501 be connected with center rotating shaft at edge, and the summation of side vertical with the housing central axis lateralarea of link 501 is less than 1/5 of the area of the radial section of air stream outlet 403 on thermal current flow direction.When lateralarea link 501 being blocked air stream outlet 403 side is arranged on 1/5 of air outlet area of section air-flow by time resistance can reduce, radiating effect would not be had influence on because radiator fan 5 will be set up like this.
The present embodiment operationally, light source substrate 2 by heat trnasfer to radiator 3, now the temperature on radiator 3 surface rises, ambient air is also just heated, and hot-air can upwards flow by relative cold air, cold air sinks, because the restriction hot-air of housing 4 can only flow towards air-flow accelerating sections 402 direction, the reduction gradually of the area of section of air duct sections 401 is relatively docked due to air-flow accelerating sections 402, design according to Bernoulli equation, the flow of air-flow is certain, when the reduced cross-sectional of passing, such thermal current can accelerate to move upward and the radiator fan 5 driving air stream outlet 403 to go out rotates, the radiator fan being arranged on top then can rotate under the effect of air-flow perpendicular flow accelerates sending of thermal current, the temperature of reduction case top increases the temperature difference inside and outside housing further.Radiator 3 by feeding housing energy lasting for cold air, can be accelerated the heat exchange on radiator 3 surface, improves radiating efficiency under the effect of the gentle stream guide part 7 of cold airflow passage 6 formed further by the bottom sides of radiating fin and housing 4 simultaneously.
More than illustrate it is only to explanation of the present utility model, those of ordinary skill in the art's can completely is made to implement this programme, but be not to restriction of the present utility model, those skilled in the art can make to the present embodiment the amendment not having creative contribution as required after reading this description, and these are all not creative amendments.As long as but be all subject to the protection of Patent Law in right of the present utility model.