JP4482875B2 - Emergency lighting system - Google Patents

Description

  The present invention relates to an emergency lighting device using a semiconductor light emitting element such as a light emitting diode as a light source.

  In recent years, a light-emitting diode, which is a semiconductor light-emitting element with a long life and low power consumption, is employed as a light source for an emergency lighting device, as shown in Patent Document 1 below, instead of a light bulb having a filament. It has become like this.

  However, the light emitting diode generates a relatively large amount of heat when it is turned on, and there is a problem that the luminous efficiency is lowered due to this temperature rise and a predetermined illuminance cannot be obtained.

  In order to solve this problem, in an illumination device using this type of light emitting diode as a light source, as shown in Patent Documents 2 and 3 below, the heat dissipation characteristics of the light emitting diode are improved and the decrease in light emission efficiency is suppressed. Things have been done.

  The one disclosed in Patent Document 2 includes a heat conductive graphite provided so as to be in contact with an end portion of a lead wire of a light emitting diode and a heat radiator provided directly or indirectly on the heat conductive graphite to emit light. The diode heat is dissipated to the outside to prevent temperature rise.

The one disclosed in Patent Document 3 is configured to seal an LED chip in a container, fill the container with a liquid, and dissipate heat from the LED chip by the liquid to suppress an increase in temperature. .
JP 2004-103256 A JP 2003-100110 A JP-A-11-163410

  However, an emergency lighting device that is turned on in the event of a power outage in the event of a fire, etc., must fulfill its prescribed emergency lighting function even when the ambient temperature is considerably high due to a fire. Therefore, in the guidelines for emergency lighting equipment technical standard JIL5501 (Japan Lighting Equipment Manufacturers Association standard) or emergency lighting equipment, it is stipulated that 1-lux lighting can be performed for 30 minutes at an ambient temperature of 140 ° C. ing.

  In the light emitting diode, the junction part of the PN junction is generally allowed up to a rated temperature of about 120 ° C. However, when the ambient temperature of the device becomes a high temperature of 140 ° C., the light emitting diode raised to 120 ° C. It is difficult to cool the heat by radiating the temperature to the outside air, and the usual heat radiating means disclosed in Patent Documents 2, 3 and the like cannot take countermeasures.

  As a result, the light emitting diode cannot be cooled, the temperature rises, the light emission efficiency is lowered, and there is a problem that it is difficult to continue illumination that satisfies the above-described criteria in an emergency.

  The present invention provides an emergency lighting device capable of suppressing a temperature rise of a semiconductor light emitting element such as a light emitting diode even when the ambient temperature rises, improving luminous efficiency, and performing predetermined illumination in an emergency. For the purpose.

Invention emergency lighting device according to claim 1, the body and; thermally conductive; consists radiator plate provided on the back surface of the semiconductor light emitting element and a substrate mounted on the substrate, a light source and to be housed in the body consists of a good metallic, disposed radiating plate of the light source to form a hollow region therein, the heat exchange means is housed in the body and, housed in the hollow region of the heat exchange means heat exchange medium absorbs heat from the light source A storage battery that is thermally insulated from the semiconductor light emitting element and the heat exchange means and disposed in the main body; a charging circuit that charges the storage battery during power supply; a lighting circuit that controls lighting of the light source by the storage battery in an emergency; and a heat exchange means And a heat insulating member provided in the main body so as to be thermally shielded from outside air.

  According to the first aspect of the present invention, there is configured an emergency lighting device capable of performing predetermined illumination in an emergency by suppressing the temperature rise of the light source and improving the light emission efficiency.

  The “light source” allows a light emitting diode or a semiconductor laser.

  The “heat exchange medium” allows incombustible liquid such as water or alcohol, or gas having good thermal conductivity such as argon or helium.

“The heat exchange means , which is made of a metal with good thermal conductivity, forms a hollow area inside and is disposed on the heat sink of the light source, and is housed in the main body ” is directly or indirectly with these heat exchange media. The heat exchange medium is disposed on the heat radiating plate of the light source to allow the heat exchange medium to absorb the heat from the light source by the action of vaporization heat or specific heat in a boiling state.

"Heat exchange means" is a unit made up of a case made of a metal with good thermal conductivity, such as aluminum, containing a heat exchange medium inside the case, and arranged on the heat sink of the light source. Allow what you did.

  “The heat insulating member provided in the main body so as to thermally shield the heat exchange means from the outside air” allows the heat exchange medium to absorb the heat generated from the light source even when the ambient temperature is high. In addition, the heat exchange means is covered with a heat insulating member, and is allowed to be thermally shielded from outside air and accommodated in the main body.

  According to a second aspect of the present invention, in the emergency lighting device according to the first aspect, the storage battery is arranged in the main body so as to be able to exchange heat with the outside air.

  According to the second aspect of the present invention, the storage battery is configured to suppress the thermal influence on the light source, further suppresses the temperature rise of the light source, improves the light emission efficiency, and performs predetermined illumination in an emergency. An emergency lighting device is constructed.

The invention according to claim 3 is the emergency lighting device according to claim 1 or 2, wherein the light source is a light emitting diode , and the heat exchange medium absorbs heat from the light emitting diode by heat of vaporization in a boiling state. To do.

According to the third aspect of the present invention, an emergency lighting device is provided that can suppress the temperature rise of the light emitting diode by the heat of vaporization, improve the light emission efficiency, and perform predetermined illumination in an emergency.

The invention according to claim 4 is the emergency lighting device according to claim 3, wherein the heat exchange medium has a boiling point higher than an upper limit value of a normal use temperature range and lower than a maximum rated temperature of the light emitting diode. And

According to the fourth aspect of the present invention, there is configured an emergency lighting device capable of performing predetermined illumination in an emergency by suppressing the temperature rise of the light emitting diode by the heat of vaporization and improving the light emission efficiency.

  According to a fifth aspect of the present invention, in the emergency lighting device according to the third or fourth aspect, the time until the heat exchange medium boils and the vaporization is completed is substantially the same as the time until the end of discharge of the storage battery. It is characterized by that.

  According to the fifth aspect of the present invention, an emergency lighting device capable of reliably ensuring emergency lighting is configured.

  The invention described in claim 6 is the emergency lighting device according to claim 1 or 2, wherein the heat exchange medium absorbs heat from the light source by specific heat.

  According to the sixth aspect of the present invention, an emergency lighting device is provided that can suppress the temperature rise of the light source by specific heat, improve the light emission efficiency, and perform predetermined illumination in an emergency.

According to the present invention, consists of a good thermal conductivity metal, is disposed on the heat radiating plate of the light source to form a hollow region inside, a heat exchange means is housed in the body, the heat exchange means The heat exchange medium that is housed in the hollow area and absorbs heat from the light source, and the heat insulating member provided in the main body so as to thermally shield the heat exchange means from the outside air, suppress the temperature rise of the light source and improve the luminous efficiency. Thus, it is possible to provide an emergency lighting device capable of performing predetermined illumination in an emergency. Further, since the storage battery is thermally shielded from the semiconductor light emitting element and the heat exchanging means and disposed in the main body, it can be prevented from being affected by heat.

  According to the invention of claim 2, the storage battery is configured to suppress the thermal influence on the light source, to further suppress the temperature rise of the light source, improve the light emission efficiency, and perform predetermined illumination in an emergency. A possible emergency lighting device can be provided.

According to the invention of claim 3, since the heat exchange medium is configured to absorb heat from the light emitting diode by the heat of vaporization in a boiling state, the temperature increase of the light emitting diode is suppressed, the light emission efficiency is improved, An emergency lighting device capable of performing illumination can be provided.

According to the invention of claim 4, the heat exchange medium, its boiling point is higher than the upper limit of the normal temperature range, since lower than the maximum rated temperature of the light emitting diode structure, to suppress the temperature rise of light-emitting diodes, light emitting It is possible to provide an emergency lighting device capable of improving the efficiency and performing predetermined illumination in an emergency.

  According to the invention of claim 5, since the time until the heat exchange medium boils and the vaporization is completed is substantially the same as the time until the discharge of the storage battery is completed, it is possible to reliably ensure emergency lighting. A possible emergency lighting device can be provided.

  According to the invention of claim 6, since the heat exchange medium absorbs heat from the light source by specific heat, it is possible to suppress temperature rise of the light source, improve luminous efficiency, and perform predetermined illumination in an emergency. An emergency lighting device can be provided.

  Hereinafter, an embodiment of an emergency lighting device according to the present invention will be described.

  FIG. 1 is a longitudinal sectional view showing a part of the emergency lighting device according to the first embodiment of the present invention.

  The emergency lighting device 10 of the present embodiment is configured as an emergency light installed on a ceiling surface of a room such as a building facility, and includes a main body 11, a semiconductor light emitting element 12 serving as a light source, and a heat exchange medium 13. The heat exchange means 14, the heat insulating member 15, the storage battery 16, and the circuit block 17 are configured.

  The main body 11 is made of a heat-resistant metal such as a coated steel plate, and includes a case 11a having a substantially cylindrical box shape, a bottom plate 11b that closes the lower surface of the case, and a top plate 11c that closes the upper surface. The entire external shape is configured to have a cylindrical shape with a substantially circular cross section.

  A recess 11d is formed in a substantially central portion of the top plate 11c, a lead wire drawing boss 11e is integrally formed in the central portion of the recess, and an opening 11f is formed in a substantially central portion of the bottom plate 11b.

  The semiconductor light emitting element 12 includes a light emitting diode (hereinafter referred to as “LED”), and one white LED is prepared in this embodiment.

  The LED 12 is configured to emit light mainly in one direction, that is, the axial direction of the LED (indicated by a one-dot chain line LL in FIG. 1), and have a power consumption of 5 W.

  The LED 12 includes a substantially disc-shaped printed circuit board 12a in which a chip element is mounted at the center, and a heat radiating plate 12b made of a metal having good thermal conductivity such as aluminum provided in contact with the back surface of the printed circuit board. . The heat radiating plate 12b is formed in a substantially disc-like plate shape having the same shape as the printed board 12a.

  The heat exchanging means 14 is made of a metal having good thermal conductivity such as aluminum, and forms a unit case 14a composed of a hollow cylinder by closing both ends of the cylinder, and encloses water 13 as a heat exchange medium therein. To do.

  In the case of the present embodiment, the amount of water 13 that is a heat exchange medium encloses 4 g of water for an LED that consumes 5 W of power.

  Further, the narrow tube 14b is protruded from the upper part of the unit case 14a, and the open end 14c of the thin tube is attached to the side wall 11c of the case 11a of the main body so as to communicate with the outside air, and the pressure valve 14d is provided in the middle portion of the conduit of the narrow tube 14b. Provide.

  The bottom surface 14e of the unit case 14a is formed in a flat plane having a substantially disk shape, and the LED 12 configured as described above is incorporated in this plane.

  That is, the heat radiating plate 12b of the LED 12 is brought into contact with the bottom surface 14e of the unit case 14a, and two screws 12c are screwed into the bottom surface 14e from the printed circuit board 12a so that they are completely adhered to each other.

  Thereby, the heat generated from the LED 12 is firmly fixed so as to be reliably conducted from the heat radiating plate 12b to the water 13 as the heat exchange medium via the bottom surface 14e of the unit case 14a.

  The bottom surface shape of the unit case 14a is configured to be substantially the same as the heat sink plate 12b having a substantially disk shape, and the entire surface of the heat sink plate 12b is brought into close contact with the bottom surface 14e of the unit case 14a.

  As described above, the heat exchanging means 14 incorporating the LED 12 is incorporated in the case 11a of the main body.

  That is, in order to support the heat exchange means 14 in the main body 11, a support member 11g that forms a cylinder is formed from a heat-resistant metal such as a steel plate, and an opening formed in a substantially central portion of the bottom plate 11b of the main body. Install upright on the inner surface of 11f.

  The inner diameter dimension of the support member 11g is formed slightly larger than the diameter dimension of the cylindrical outer shape of the unit case 14a, and the unit case 14a is inserted into the inner cylindrical surface of the support member 11g. A stopper protrudes from the inner surface of the support member 11g, and the unit case 14a is supported by being locked to the stopper, thereby forming a space portion with the bottom plate 11b of the main body.

  At this time, the open end portion 14c of the thin tube 14b is attached so as to communicate with the outside air from the side wall 11c of the case 11a.

  The reflector 18 is supported in a space formed on the bottom surface of the case 11a. The reflector 18 has a through hole at the center, the light emitting chip element of the LED 11 is fitted into the through hole, and the open end of the reflector is engaged with the outer surface side of the opening 11f formed in the bottom plate 11b of the main body. And support.

  The reflector 18 constitutes an optical path control means. The reflector 18 is formed of a heat-resistant metal such as stainless steel so that the surface is a glossy mirror surface, and the reflection surface is a concave surface such as a paraboloid or a rotating paraboloid. The luminous body X is configured by setting the light rays emitted from the LEDs 12 so that the light distribution angle is about 30 to 60 degrees.

  The optical path control means may be constituted by a lens body made of synthetic resin such as colorless and transparent polycarbonate or glass instead of the reflector 18.

  Further, the circuit block 17 is installed on the side surface of the support member 11g supported in the case 11a.

  The circuit block 17 has a shape of a half ring along the cylindrical side surface of the support member. In the block case made of heat-resistant synthetic resin, the charging circuit 17a for charging the storage battery 16 at the time of power feeding and the storage battery 16 at the time of emergency in the LED 12 A circuit board on which a lighting circuit 17b for controlling lighting is mounted is incorporated.

  The inner surface of the case 11a of the main body in which each component is arranged and configured as described above is filled with a heat insulating material 15 made of foamed polystyrene as a heat insulating member by foaming, and the unit case 14a as a heat exchange means is thermally shielded from the outside air. Thus, it is configured not to be affected by the outside air temperature, and is configured to cut off the dependence on the ambient temperature.

  The storage battery 16 is housed and installed in the recess 11d of the top plate 11c of the main body so as to be disposed outside the main body 11. As a result, the storage battery 16 is thermally shut off from the LED 12 and the thermal influence on the LED 12 can be suppressed, and the storage battery 16 touches the outside air and directly exchanges heat with the outside air, thereby improving the heat exchange performance. 16 also cools well.

  In the figure, 19 is a glove that is detachably attached to the case 11a by means such as screwing so as to cover the bottom surface of the main body 11, and is composed of heat-resistant tempered glass or synthetic resin that is made of translucent milky white or the like. .

  The charging circuit 17a in the circuit block 17 is supplied with commercial power via a lead wire 20 drawn from a boss portion 11e formed on the top plate 11c of the main body, and the storage battery 16 is supplied by the charging circuit 17a during power feeding. The battery 12 is configured to automatically control lighting of the LED 12 by the lighting circuit 17b when the battery is charged and a power failure occurs in an emergency such as a fire.

  In the figure, reference numeral 21 denotes a charge monitor which is attached to the bottom plate 11c of the main body and is composed of a green LED for displaying the charging state of the storage battery 16, and is turned on when the storage battery 16 is in a charging state and is turned off when it is in a non-charging state. Set as follows. In addition, the light ray of the green LED is visually recognized through the glove 19 made of milky white or the like.

  Due to the above configuration, the LED 11 as a light source as a whole has a disk shape in plan view, and has a diameter D of about 75 to 100 mm and a height h of about 40 to 60 mm. A lighting device is configured.

  The operation of the emergency lighting device as an emergency light constructed as described above will be described.

  In order to install the emergency light 10 on the ceiling surface A of a room such as a building facility, the main body 11 and the globe 19 are separated, and the main body is screwed into the ceiling surface A from the inner surface of the upper surface plate 11c of the main body using wood screws or the like. To do.

  At this time, the lead wire 20 is pulled out from the boss portion 11e of the upper surface plate 11c and is connected to a power line wired on the back of the ceiling so as to supply commercial power to the charging circuit 17a and the like in the circuit block 17.

  Next, the globe 19 is attached to the lower surface of the main body 11 by screwing so that the main body 11 installed on the ceiling surface A is covered with the globe 19 from below.

  Thereby, power is supplied from the commercial power source to the charging circuit 17a, and the storage battery 16 is always charged.

  Next, for example, when a fire occurs and a power failure occurs, power is automatically supplied to the lighting circuit 17b using the charged storage battery 16 as a power source, and the LED 12 is turned on to illuminate a dark room.

  Due to the lighting action of the LED 12, the PN junction portion of the light emitting element generates heat and the temperature rises. This temperature rises up to about 120 ° C.

  The heat generated by this temperature rise is conducted from the heat radiating plate 12b to the water 13 as the heat exchange medium through the bottom surface 14e of the unit case 14a, and the water absorbs the heat generated from the LED.

  At this time, since the amount of 4 g of the water, which is a heat exchange medium, is enclosed in an LED having a power consumption of 5 W, the water becomes a boiling state in a short time and is evaporated and evaporated.

  Due to the evaporation of the water, the pressure in the sealed unit case 14a is increased, the pressure valve 14d is opened, and the vapor is released to the outside air through the narrow tube 14b. The heat absorbed by the water is sequentially released by the heat of vaporization at this time, and the heat generated from the LED is continuously absorbed to suppress the temperature rise of the LED.

  At this time, the ambient temperature of the room rises due to a fire, but since the unit case 14a is blocked from the outside air by the heat insulating material 15, the temperature of the water 13 does not become the ambient temperature raised to a high temperature by the fire. The heat from the LED that is maintained within the normal use temperature range of about 5 to 35 ° C. and rises to 120 ° C. can be absorbed sufficiently.

  According to the present embodiment, the water generated from the LEDs can be evaporated by absorbing heat continuously for 30 to 40 minutes.

  In addition, the energy when water is vaporized is 2.26 KJ / g. With 4 g of water, a 5 W LED can be reduced to about 65 ° C. to prevent a decrease in luminous flux, and an illuminance of about 1 to 2 lux. Was able to hold.

  As a result, it was possible to sufficiently satisfy the above-mentioned prescribed range of “perform lighting of 1 lux for 30 minutes at an ambient temperature of 140 ° C.”.

  Note that, as in the present embodiment, the amount of water 4 g required by the heat absorption method using the heat of vaporization of water in a state of being blocked from the outside air by the heat insulating material can be obtained by the following calculation formula.

Heat of vaporization of endothermic body (water in this embodiment): 2.26 KJ / g
5W LED heat generation for 30 minutes: 5W x 30 x 60 seconds = 9000J
Therefore, 9000J / 2260J / g = 4g
Moreover, the water which is the heat exchange medium in the present embodiment has a boiling point of 100 ° C. which is higher than the upper limit of 35 ° C. of about 5 to 35 ° C. which is a normal use temperature range at normal temperature, and lower than the maximum rated temperature of 120 ° C. Is set.

  Further, the time until the water as the heat exchange medium boils and the vaporization is completed, that is, about 30 to 40 minutes is set to be substantially equal to the discharge completion time of the storage battery 16. Thereby, during the discharge time of the storage battery 16, in other words, during the time when the LED continues to be lit, the temperature rise of the LED 12 can be sufficiently suppressed, and the emergency illuminance can be secured with a predetermined illuminance.

  In this embodiment, it is composed of a single white LED. However, depending on the usage conditions, a plurality of LEDs may be used, and the emission color may be red, yellow, green, etc. The colors may be combined.

  Although the globe 19 is composed of translucent milky white tempered glass, it may be colorless and transparent, or the material may be composed of heat-resistant synthetic resin.

  Further, the heat sink 12b of the LED 12 is supported by being in close contact with the unit case 14a. However, the heat sink 12b of the LED is omitted and the printed circuit board 12a is directly supported by the bottom surface 14e of the unit case 1a. Also good.

  Although water is used as the heat exchange medium, other noncombustible liquids may be used, and liquids such as alcohol may be used.

  Although the heat insulating material 15 made of expanded polystyrene is filled by foaming as a heat insulating member, other heat insulating materials such as glass wool may be incorporated and filled.

  Although the main body 11 is made of a heat-resistant metal such as a coated steel plate, it may be made of a synthetic resin having heat resistance and electrical insulation.

  Moreover, although the main body 11 is configured to have a cylindrical shape with a substantially circular cross section, it may be configured in a rectangular shape such as a quadrangle or a rectangle to further improve the design.

  Although the storage battery 16 is disposed on the outer surface of the main body 11, it may be accommodated in the main body and indirectly exchanged with the outside air via the case 11a such as the upper surface plate 11c of the main body. In this case, the storage battery 16 is covered with a heat insulating material 15 so that the unit case 14a is not thermally affected.

  Although the circuit block 17 having the charging circuit 17a and the lighting circuit 17b is housed and provided in the main body 11, it is provided on the outer surface of the main body like the storage battery 16 so that the LED 12 is not affected by the heat generated from the circuit components as much as possible. The charging circuit 17a and the lighting circuit 17b of the circuit block 17 may be cooled.

  Although the emergency lighting device of this embodiment is configured as an emergency light, it may be configured as various emergency lighting devices for home use, shops, facilities, business use, etc.

  According to the present embodiment, the unit case 14a is thermally shielded from the outside air by the heat insulating material 15 so as to cut off the dependence on the ambient temperature, and the water 13 enclosed in the unit case 14a is used to remove the LED 12 from the LED 12. Since the generated heat is absorbed, even if the ambient temperature becomes high due to a fire or the like, the temperature rise of the LED 12 can be reliably suppressed, the luminous efficiency is improved, and a predetermined illumination is provided in an emergency. It can be carried out.

  In addition, by arranging the storage battery 16 outside the main body so that heat can be exchanged with the outside air, the LED 12 can reduce the influence of heat generated from the storage battery 16, and more reliably suppress the temperature rise of the LED 12, Luminous efficiency can be improved and predetermined illumination can be performed in an emergency.

  Since water 13 is used as a heat exchange medium and the heat from the LED 12 is absorbed by the heat of vaporization in a boiling state, the temperature rise of the LED is reliably suppressed by an inexpensive heat exchange medium, and the luminous efficiency is improved. Predetermined lighting can be performed in an emergency.

  Since water is used as the heat exchange medium and its boiling point is higher than the upper limit of the normal operating temperature range and lower than the maximum rated temperature of the semiconductor light emitting device, the temperature rise of the LED is surely suppressed and the luminous efficiency is improved. Thus, predetermined illumination can be performed in an emergency.

  The time until the water 13 as the heat exchange medium boils and the vaporization is completed is substantially the same as the time until the discharge of the storage battery 16 is completed, so that it is possible to reliably ensure emergency lighting such as a fire. be able to.

  FIG. 2 is a longitudinal sectional view showing a part of the emergency lighting device according to the second embodiment of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals.

  The emergency lighting device of this embodiment encloses water, which is a heat exchange medium, in a unit case of a heat exchange means, absorbs heat generated from the LED by the specific heat of the water, and suppresses the temperature rise of the LED. is there.

  That is, the unit case 14a does not include the narrow tube 14b provided in the first embodiment, but is sealed in a sealed state and encloses water 13 as a heat exchange medium.

  In the case of this embodiment, the amount of water 13 to be sealed is about 33 g of water for the LED 12 whose power consumption is 5 W.

  Thereby, the heat generated from the LED 12 is conducted from the heat radiating plate 12b to the water 13 through the bottom surface 14e of the unit case 14a, and the heat is absorbed by the specific heat.

  At this time, since the amount of about 33 g of the water 13 that is a heat exchange medium is enclosed in the LED with the power consumption of 5 W, the heat absorption action is continued for a relatively long time.

  According to the present embodiment, the water 13 can continuously absorb the heat generated from the LED 12 for 30 minutes to 40 minutes, and the temperature rise of the LED is continuously suppressed.

  At this time, the ambient temperature of the room rises due to a fire, but since the unit case 14a is blocked from the outside air by the heat insulating material 15, the temperature of the water 13 does not become the ambient temperature raised to a high temperature by the fire. The heat from the LED 12 which is kept within the normal use temperature range of about 5 to 35 ° C. and rises to 120 ° C. can be absorbed sufficiently.

  Moreover, the energy when water is vaporized is 2.26 KJ / g, and a 5 W LED can be reduced to about 65 ° C. with 33 g of water to prevent a decrease in luminous flux. Was able to hold.

  As a result, it was possible to sufficiently satisfy the above-mentioned prescribed range of “perform lighting of 1 lux for 30 minutes at an ambient temperature of 140 ° C.”.

  In addition, as in this embodiment, the amount of water 33g required by the method based on the specific heat of water in a state insulated from the outside air by a heat insulating material can be obtained by the following calculation formula.

Specific heat of the heat storage body (water in this embodiment): 4.2 J / g · K
5W LED heat generation for 30 minutes: 5W x 30 x 60 seconds = 9000J
Therefore, 9000 J / (4.2 × 65K) = 33 g
Also in this embodiment, water is used as the heat exchange medium, but other incombustible liquids may be used, and liquids such as alcohol may be used.

  According to this embodiment, since the heat from the LED is absorbed by the specific heat of water, the temperature rise of the LED can be reliably suppressed, the luminous efficiency can be improved, and predetermined illumination can be performed in an emergency. .

  In particular, since it is not necessary to provide a thin tube, a pressure valve, or the like in the unit case that is a heat exchange means, it is possible to provide an emergency lighting device that is simpler in configuration and advantageous in cost.

  Other configurations, functions, modifications, functions and effects are the same as those in the first embodiment.

  FIG. 3 is a longitudinal sectional view showing a part of the emergency lighting device according to the third embodiment of the present invention, with the same reference numerals assigned to the same parts as those in the first and second embodiments.

  The emergency lighting device of this embodiment encloses a gas having good thermal conductivity, such as argon or helium, as a heat exchange medium in a unit case of the heat exchange means, and generates heat from the LED due to the moving action by heating the gas. Is used to suppress the LED temperature rise.

  That is, a thin tube 14b is protruded from the upper part of the unit case 14a, and an open end portion 14c of the thin tube is communicated with a reservoir portion 14f configured to be hollow and sealed, and heat conductive materials such as argon and helium as a heat exchange medium. A good gas 13a is sealed in the unit case 14a, the thin tube 14b, and the reservoir 14f.

  Thereby, the heat generated from the LED 12 is conducted and warmed from the heat radiating plate 12b to the gas 13a as the heat exchange medium through the bottom surface 14e of the unit case 14a, and the heated gas is accumulated through the discharge pipe 14b. It moves into the part 14f.

  The gas 13a that has been warmed during the movement is cooled, and by repeating this action, the heat of the LED 12 is continuously absorbed by the gas and the temperature rise is suppressed.

  As a result, it is possible to prevent a decrease in the luminous flux and maintain a predetermined illuminance, and sufficiently satisfy the above-mentioned prescribed range of “perform lighting of 1 lux for 30 minutes at an ambient temperature of 140 ° C.”. Can be satisfied.

  At this time, the ambient temperature of the room rises due to a fire, but since the unit case 14a is blocked from the outside air by the heat insulating material 15, the temperature of the gas 13a does not become the ambient temperature raised to a high temperature by the fire. The LED which is kept within the normal use temperature range of about 5 to 35 ° C. and rises to 120 ° C. can sufficiently absorb heat.

  According to the present embodiment, it is possible to reliably suppress an increase in the temperature of the LED by a cooling action due to the movement of gas, improve the light emission efficiency, and perform predetermined illumination in an emergency.

  Other configurations, functions, modifications, functions and effects are the same as those in the first and second embodiments.

  FIG. 4 is a front view of an emergency lighting device according to a fourth embodiment of the present invention, and FIG. 5 is a longitudinal sectional view taken along line AA of FIG.

  The emergency lighting device 40 of the present embodiment is configured as an emergency light installed on the wall surface of a corridor that can also be an evacuation route such as a passage of a building facility, and includes a main body 41, a semiconductor light emitting element 42 serving as a light source, and a lens. And the like, a heat exchange means 45 having a heat exchange medium 44, a heat insulating member 46, a storage battery 47, and a circuit block 48.

  The main body 41 is made of a heat-resistant metal such as a coated steel plate, and includes a case 41a having a horizontally long rectangular parallelepiped box shape and a decorative frame 41b provided so as to cover an opening in front of the case.

  The semiconductor light emitting element 42 includes a light emitting diode (hereinafter referred to as “LED”), and three white LEDs are prepared in the present embodiment.

  Each LED 12 is configured to emit light mainly in one direction, that is, in the axial direction of the LED (indicated by a one-dot chain line LL in FIG. 5), and have a power consumption of 5 W each.

  Each LED 42 includes a substantially disc-shaped printed board 42a having a chip element mounted in the center thereof, and a heat radiating plate 42b made of a metal having good thermal conductivity such as aluminum provided in contact with the back surface of the printed board. To do. The heat radiating plate 42b is formed in a substantially disk-like plate shape having the same shape as the printed board 42a.

  The heat exchanging means 45 is made of a metal having good thermal conductivity such as aluminum, and forms a unit case 45a made of a hollow cylinder by closing both ends of the cylinder, and encloses water 44 as a heat exchanging medium therein. To do. The bottom surface 45e of the unit case 45a is formed to be inclined obliquely.

  Further, the thin tube 45b is projected from the upper part of the unit case 14a, and the open end 45c of the thin tube is attached to the back plate 41b of the case 41a of the main body 41 so that the open end 45c communicates with the outside air. A pressure valve 45d is installed in the part.

  An inclined bottom surface 45e of the unit case 45a of the heat exchange means 45 is formed on a flat surface having a substantially disk shape, and the LED 42 configured as described above is incorporated in this plane.

  That is, the heat sink 42b of the LED 42 is brought into contact with the inclined bottom surface 45e of the unit case 45a, and two screws are screwed from the printed circuit board 42a into the bottom surface 14e of the unit case 14a so that they are completely adhered.

  Thereby, the heat generated from the LED 42 is firmly fixed so as to be reliably conducted from the heat radiating plate 42b to the water 44 as the heat exchange medium via the bottom surface 45e of the unit case 45a.

  The shape of the bottom surface 45e of the unit case 45a is the same as that of the heat sink 42b having a substantially disk shape, and the entire surface of the heat sink 42b is brought into close contact with the bottom surface 45e of the unit case 45a.

  As described above, three heat exchange means 45 incorporating the LED 42 are prepared and incorporated into the case 41 a of the main body 41.

  That is, in order to support the three heat exchanging means 45 in the main body 41, a support plate 41g having three cylindrical support portions 41f is made of a heat-resistant metal such as a steel plate, and the support plate 41g is used as a case. It attaches to the opening part of the front of 41a.

  The inner diameter of each support portion 41f is slightly larger than the diameter of the cylindrical outer shape of each unit case 45a, and the three unit cases 45a are inserted and supported on the inner surfaces of the three support portions 41f.

  At this time, the open ends 45c of the three thin tubes 45b are attached so as to communicate with the outside air from the back plate 41c of the case 41a of the main body.

  As described above, each LED 42 incorporated in the unit case 45a incorporates a lens body 43 serving as an optical path control means.

  That is, the three lens bodies 43 are made of a synthetic resin such as colorless and transparent polycarbonate, and the vertical section has a mortar shape and the horizontal section has a circular shape. The light emitting chip element of the LED 42 is fitted, the optical path of the light emitted from the LED 42 is controlled by the lens, and the light distribution angle is set to about 20 degrees.

  Since the LED 42 incorporated in the lens body 43 is supported on the inclined bottom surface 45e of the unit case 45a as described above, the optical axis LL of the LED 42 has an angle a of 15 degrees to 30 with respect to the horizontal line. The light emitter X is configured to irradiate light in the direction of the degree, and three light emitters are prepared. The lens body 43 is supported by being engaged with three circular openings formed in front of a decorative frame 41b described later.

  Further, a circuit block 48 is installed around the unit case 45a.

  The circuit block 48 is ring-shaped along the cylindrical side surface of the unit case 45a, and the LED 42 is lit by the charging circuit 48a for charging the storage battery 47 during power supply and the storage battery 47 in an emergency in a block case made of heat-resistant synthetic resin. A circuit board on which the lighting circuit 48b to be controlled is mounted is incorporated.

  The decorative frame 41b is a heat-resistant metal such as a coated steel plate, has a horizontally long rectangular box shape, is provided so as to cover the opening of the front surface of the case 41a, and has three lens bodies 43 of the light-emitting bodies X on the front surface. An opening that engages is formed.

  The upper surface portion R of the decorative frame 41b is configured so that the cross-section has an R shape so that dust does not collect easily. Further, the lens body 43 is disposed so that the front plate of the decorative frame 41b is located outside the lens body 43 so that the lens body 43 does not protrude from the opening of the decorative frame 41b, so that dust does not easily adhere to the surface of the lens body 43. And

  The inner surface of the case 41a of the main body in which the components are arranged and configured as described above is filled with a heat insulating material 46 made of foamed polystyrene, which is a heat insulating member, by foaming, so that the unit case 45a, which is a heat exchanging means, is thermally transferred from the outside air. It is cut off so that it is not affected by outside air temperature, and the dependence on ambient temperature is cut off.

  The storage battery 47 is housed and installed in a ring-shaped recess 41 d formed on the back plate 41 c of the main body so as to be disposed outside the main body 41. As a result, the storage battery 47 is thermally cut off from the LED 42 and the thermal influence on the LED 42 can be suppressed, and the storage battery 47 touches the outside air and directly exchanges heat with the outside air, thereby improving the heat exchange performance. 47 is also well cooled.

  In the figure, reference numeral 50 denotes a charge monitor which is attached to the front face of the decorative frame 41b and is composed of a green LED for displaying the charge state of the storage battery 47. Set to be.

  The charging circuit 48a in the circuit block 48 is supplied with commercial power via a lead wire (not shown) drawn from the back plate 41c of the main body, and the storage battery 47 is charged by the charging circuit 48a during power feeding. In the event of a power failure in the event of an emergency such as a fire, the storage battery 47 automatically turns on the LED 42 by the lighting circuit 48b.

  With the above configuration, a horizontally long rectangular parallelepiped as a whole using three LEDs as light sources, a width dimension w of about 150 to 180 mm, a height dimension h of about 100 mm, a depth dimension d1 of about 65 mm, and a protruding dimension from the wall surface B An emergency lighting device is constructed as an emergency light 40 having a small and thin d2 with a d2 of about 30 mm.

  The operation of the lighting device configured as an emergency light will be described.

  In order to install the emergency light 40 on the concrete wall surface of the corridor of the building, a horizontally long mounting hole for installation is formed in the wall surface B in advance. The position of the mounting hole is formed at a height of about 30 cm from the floor surface of the hallway.

  A main body 41 having a horizontally long rectangular parallelepiped shape is fitted into the mounting hole with the decorative frame 41b on the corridor side, and is screwed and installed on the wall surface with concrete screws from the front of the decorative frame 41b.

  At this time, the lead wire is pulled out from the back plate 41c, connected to the power line wired in the wall surface B, and installed so as to supply the commercial power to the charging circuit 48a of the circuit block 48, and the charging circuit 48a from the commercial power source is installed. Is supplied with power and the storage battery 47 is always charged.

  Thereby, the emergency light 40 is installed about 30 cm from the floor surface of the corridor, and the light beams from the three LEDs 42 are installed so as to irradiate in the direction of 15 degrees to 30 degrees with respect to the horizontal plane, that is, the floor surface.

  A plurality of emergency lights 40 are prepared, and are installed in the hallway with, for example, equal pitch construction at intervals of about 2 to 4 m.

  Next, for example, when a fire occurs and a power failure occurs, power is automatically supplied to the lighting circuit 48b using the charged storage battery 47 as a power source, and each LED 42 is lit to illuminate a dark corridor. .

  At this time, the main body 41 forms a horizontally long rectangular parallelepiped, a plurality of them are installed at equal intervals, and are lit in a line shape.

  Due to the lighting action of each LED 42, the PN junction portion of the light emitting element generates heat and the temperature rises. However, by the same operation as described in the first embodiment, the discharge time of the storage battery 47, in other words, each LED 42 During the time during which the LED continues to light, the temperature rise of each LED 42 can be sufficiently suppressed, and a predetermined emergency illuminance can be secured.

  In the present embodiment, it is composed of three white LEDs 42, but the number is selected and increased or decreased according to the use conditions, and the light emission color is red, yellow, green, etc., and further various colors are combined. May be.

  The lens body 43 is made of a colorless and transparent synthetic resin. However, the lens body 43 may be colored in various colors as described above, or may be translucent or not completely transparent, and the material is not limited to the synthetic resin. You may comprise with the tempered glass which has.

  Although the heat insulating material 46 made of expanded polystyrene is filled by foaming as the heat insulating member, other heat insulating materials such as glass wool may be incorporated and filled.

  Further, the LED 42 is supported on the inclined bottom surface 45e of the unit case 45a so that the optical axis of the LED is in the direction of 15 degrees to 30 degrees with respect to the horizontal line, but the vertical surface without tilting the bottom surface 45e of the unit case 45a. It is configured so that the optical axis of the LED 42 is horizontal, and an asymmetric lens body is used as the lens body 43 so that the light of the LED 42 is irradiated in the direction of 15 to 30 degrees with respect to the horizontal line. Also good.

  Although the decorative frame 41b is made of a heat-resistant metal such as a coated steel plate, it may be made of a synthetic resin having heat resistance and electrical insulation.

  Although the storage battery 47 is provided outside the main body 41, the decorative frame 41b is configured to be removable, and the storage battery 47 is accommodated in the decorative frame 41b so that replacement, repair, and inspection of the storage battery can be performed from the front side of the main body 41. You may make it easy to do. In this case, the storage battery 47 is covered with a heat insulating material 46 so as not to thermally affect the unit case 45a.

  Moreover, although the main body 41 is configured in a horizontally long rectangular parallelepiped, it may be configured as a square or a circle to further improve the design.

  A plurality of emergency lights 40 are installed at equal intervals and are lit in a line shape so as to have the effect of evacuation guidance. Further, in the lighting circuit 48b, each LED is lit in order with a time difference. It is possible to control and configure like a light blinking travel device, and further enhance the guidance effect at the time of evacuation.

  As the heat exchange means of this embodiment, the means by the heat of vaporization of water is adopted as in the first embodiment, but the specific heat of water or the heat exchange means by gas in the second and third embodiments is adopted. May be configured.

  According to the present embodiment, similarly to the first, second, and third embodiments, even when the ambient temperature becomes high during a fire or the like, the heat of each LED is reliably absorbed to suppress the temperature rise. It is possible to improve the light emission efficiency and perform predetermined illumination in an emergency, and has the following remarkable effects as an emergency light.

  Conventionally, an emergency light using a fluorescent lamp or the like is large as a light source, and the lamp is easily damaged by an impact, so that it cannot be installed under the feet, and the installation place is limited to the ceiling.

  However, according to the present embodiment, since a small LED that is not easily damaged is used as the light source, it can be installed on the floor or the like in a corridor that can be an evacuation route, which has been conventionally difficult. An emergency light capable of adding an effect can be provided.

  Furthermore, since the LED and lens body that can easily control the optical axis in a predetermined direction are adopted, it is possible to make an optical design so as not to irradiate places such as the ceiling that are not necessary in actual use. An emergency light with no loss can be configured.

  Since a small, long-life LED is used as the light source, it is possible to construct an emergency light that is small, thin, and long-life as an instrument. In particular, since the instrument can be configured to be small and thin, construction can be facilitated by forming a small mounting hole in the concrete wall surface or the like.

  In addition, it is only necessary to install the equipment at a position about 30 cm from the floor surface. Compared to conventional ceiling surface construction, the equipment can be constructed at hand, making it easier to operate, and without being affected by the height of the ceiling. Lighting can be ensured.

  Since the lens body is arranged so that the front plate of the decorative frame is located outside the lens body so that it does not protrude from the opening of the decorative frame, dust is not easily attached to the surface of the lens body and is directly impacted. Because it is not in a positional relationship, it is difficult to break. Even if it is damaged, the lens body is very small and there is little scattering of debris.

  Other configurations, functions, modifications, functions and effects are the same as those in the first, second, and third embodiments.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above-described embodiment, and various design changes can be made without departing from the scope of the present invention.

The longitudinal cross-sectional view which notches and shows a part of emergency lighting apparatus in 1st embodiment of this invention. The longitudinal cross-sectional view which notches and shows a part of emergency lighting apparatus in 2nd embodiment of this invention. The longitudinal cross-sectional view which notches and shows a part of emergency lighting apparatus in 3rd embodiment of this invention. The front view of the emergency illuminating device in 4th embodiment of this invention. FIG. 5 is a longitudinal sectional view taken along line AA in FIG. 4.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Emergency lighting device 11 Main body 12 Light source 13 Heat exchange medium 14 Heat exchange means 15 Heat insulation member 16 Storage battery 17a Charging circuit 17b Lighting circuit

Claims (6)

With the body;
A light source housed in the main body, comprising a semiconductor light emitting device mounted on the substrate and a heat sink provided on the back surface of the substrate ;
A heat exchanging means which is made of a metal having good thermal conductivity and which is formed in a heat sink of the light source by forming a hollow region inside and is housed in the main body ;
A heat exchange medium housed in a hollow region of the heat exchange means and absorbing heat from the light source;
A storage battery that is thermally isolated from the semiconductor light emitting element and the heat exchange means and disposed in the main body;
A charging circuit for charging the storage battery during power supply;
A lighting circuit for controlling lighting of the light source by a storage battery in an emergency;
A heat insulating member provided in the main body so as to thermally shield the heat exchange means from outside air;
An emergency lighting device comprising: The emergency lighting device according to claim 1, wherein the storage battery is disposed in the main body so as to exchange heat with outside air. 3. The emergency lighting device according to claim 1, wherein the light source is a light emitting diode , and the heat exchange medium absorbs heat from the light emitting diode by heat of vaporization in a boiling state. The emergency lighting device according to claim 3, wherein the heat exchange medium has a boiling point higher than an upper limit value of a normal use temperature range and lower than a maximum rated temperature of the light emitting diode . 5. The emergency lighting device according to claim 3, wherein the time until the heat exchange medium boils and the vaporization is completed is substantially equal to the time until the discharge of the storage battery is completed. The emergency lighting device according to claim 1, wherein the heat exchange medium absorbs heat from the light source by specific heat.

Images