JP2012003854A - Led lamp used for nuclear power plant facilities and led lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED lamp which has long lifetime and low power consumption as a lighting means used in a nuclear reactor containment vessel which does not use an incandescent lamp, and an LED lighting fixture.SOLUTION: In the LED lamp used for a nuclear power plant facilities having a light-emitting section where a plurality of LED elements are arranged, a heat radiation member connected to the light-emitting section, and a base electrically connected to the light-emitting section and detachably installed to a socket for an electric bulb arranged in an enlarged diameter member, the heat radiation member comes in contact with the enlarged diameter member for an electric bulb at a fixed or more area. The LED lighting fixture uses the LED lamp.

Description

  The present invention relates to an LED lamp and an LED lighting apparatus installed in a high radiation environment of a nuclear power generation facility such as in a reactor containment vessel of a pressurized water reactor (PWR).

Incandescent light bulbs (general lighting bulbs, krypton bulbs, halogen bulbs), fluorescent lamps, HID lamps (mercury lamps, metal halide lamps, high-pressure sodium lamps), LEDs (light-emitting diodes), and many more However, incandescent light bulbs are used as light sources for lighting fixtures installed in high-radiation environments of nuclear power generation facilities, such as in the containment vessels of pressurized water reactors (PWRs). ing.
An example of using an LED lighting apparatus in a reactor containment vessel has not been known so far, but in other fields, replacement with an LED such as an incandescent light bulb has been rapidly performed in recent years. LEDs have excellent characteristics such as long life and power saving, low consumption of energy other than light energy, low emission of ultraviolet rays and heat, and low CO ₂ emission. ing.
As one of the problems of LED lamps, it is known that the lifetime has a correlation with temperature. There is a report example that the lifetime of the LED is about 100,000 hours or more when the junction temperature of the LED element is 120 ° C., about 40,000 hours at 150 ° C., and about 1000 hours at 200 ° C. (see FIG. 2). Therefore, many techniques for improving the life of the LED lamp and maintaining the luminous flux by cooling the LED without increasing the temperature have been proposed.

  For example, as a device for cooling using a heat medium, an LED array surface located on the outer surface of the heat exchange base and a heat exchange base including a central hollow portion, each LED has a plurality of LEDs on the LED array surface of the heat exchange base. Working fluid in which an LED array including LEDs, a heating unit, a cooling unit, and a conductive unit that connects the heating unit to the cooling unit are provided, the heating unit is inserted into the central hollow portion of the heat exchange base, and the connection path extends from the heat exchange base In the LED lighting assembly comprising a heat pipe including a heat dissipation module disposed in a cooling part of the heat pipe, the heat energy generated by the LED is conducted from the heat exchange base to the heating part of the heat pipe, thereby LED configured to heat and evaporate the working fluid of the heat pipe and flow in the heat dissipation module for dissipation from the conduction part to the cooling part Luminaire has been proposed (Patent Document 1).

  Moreover, as a device for diffusing the heat generated from the LED to a member serving as a heat dissipation plate by heat conduction and cooling, a trumpet-shaped metal heat dissipating part provided with a base at one end and expanding in a trumpet shape toward the opening at the other end A translucent cover attached to the opening of the trumpet-shaped metal heat dissipating portion, a metal substrate provided inside a substantially spherical body formed by the trumpet-shaped metal heat dissipating portion and the translucent cover, An LED bulb (Patent Document 2) that provides a long-life LED bulb with high luminous efficiency by suppressing the heat generation of the LED element by a cooling structure including an LED element mounted on the outer surface facing the translucent cover It consists of main components such as lamp socket, light source member, light guide, lamp housing, etc. The light source member has a plurality of LEDs installed on the substrate and bonded to the lamp socket through heat conduction, and the lamp socket is lighted High-performance LED lighting apparatus in the power saving of cooling has been proposed by which the operating temperature of the members is conducted divergence (Patent Document 3).

  In addition, an LED having a total output of several watts to several tens of watts, and a heat radiating body that radiates and cools the heat generated from the LED on the back side of the base body on which the LED is mounted is used as a predetermined heat radiation area. Disposed as a body, the heat dissipating body is a multiple concentric cylindrical body that is concentric with the central axis of the LED, and a heat conduction connecting material that transfers heat between the cylindrical bodies is connected and disposed. Even a bright high-intensity and ultra-high-intensity LED lamp with a large calorific value can be cooled sufficiently to achieve durability, and can be used to cool a heating element. The heat sink is formed by winding a band-shaped metal plate around a central axis and winding it in a roll shape, and is configured so that one height in the central axis direction gradually increases from the radial outer side toward the radial central part. The other end side in the axial direction penetrates in the thickness direction of the metal plate. Cooling device is provided with a plurality of air intake (Patent Document 5) have been proposed.

However, it is almost difficult to use these LED lighting fixtures as they are for nuclear power generation facilities. This is because when the semiconductor is irradiated with radiation, the characteristics may be remarkably deteriorated.
Also, in the unlikely event that a nuclear reactor coolant loss accident (LOCA) occurs in the reactor, an atom made of boric acid or the like containing hydrazine or caustic soda to quickly reduce the internal pressure of the reactor containment vessel Furnace containment spray water is sprayed. At this time, when these chemicals come into contact with aluminum, a chemical reaction is caused to generate a flammable gas such as hydrogen, which is dangerous. From this point of view, it is difficult to use a normal-use LED lighting apparatus that uses aluminum for the casing or heat dissipation material and uses a semiconductor for the electric circuit in the reactor containment vessel.

JP 2008-243780 Japanese Patent Laid-Open No. 2001-243809 Registered Utility Model No. 313001 Registered Utility Model No. 3125101 JP 2009-16664 A

  Many types of light sources such as incandescent bulbs, fluorescent lamps, HID lamps, and LEDs are used as light sources for general lighting equipment, but those used in the reactor containment are incandescent that does not use mercury exclusively. It was a light bulb. This is because if mercury leaks out of the lighting equipment that uses mercury, it may react with copper alloys, nickel, chromium, iron alloys, etc. used in surrounding equipment, and in the primary cooling system. This is because when mixed, nickel, chromium, iron alloys, etc. used as materials for cooling systems and the like may be damaged.

  However, incandescent light bulbs that have been used in the reactor containment vessel have a short life and a certain number of bulbs run out every year. Therefore, it is necessary to replace the bulbs regularly. Since the replacement work is performed at a high place and involves danger, there is a demand for reducing the replacement work as much as possible. Also, incandescent bulbs and glass globes are made of glass and are easily broken by impacts, etc., so they may be damaged by collisions with scaffolding materials during periodic inspections of nuclear reactor equipment, etc. is there.

A further problem is that the incandescent bulb after replacement must be properly treated as radioactive waste, which also requires a reduction in the number of incandescent bulb replacement, that is, radioactive waste. It was. Further, since the incandescent lamp has a large power consumption, it has been a problem to reduce the power consumption.
Further, when an LED lamp is used instead of an incandescent lamp, the life of the LED is shortened by heat, so that cooling of the LED becomes a problem. In a high radiation environment, it is difficult to adopt a configuration that controls voltage and current with a semiconductor that causes failure, and the glove is generally a sealed structure due to the need for drip-proof, so it is easy to dissipate heat only by air cooling. It is not. Providing an LED lamp having an efficient cooling means is also a problem to be solved.
On the other hand, there is a problem that an LED lamp must be manufactured without using aluminum in principle, under the restriction of the use of semiconductors in a high radiation environment.

  An object of the present invention is to provide an illumination means in a reactor containment vessel that does not use an incandescent bulb, and further to provide an LED lamp and an LED lighting apparatus that have a long life and low power consumption. Objective.

  The inventors of the present invention have developed an LED lamp that is optimal for use in a reactor containment vessel by accumulating earnest research with the goal of eliminating the problems of lighting equipment used in the reactor containment vessel. And LED lighting fixtures were created.

The present invention comprises the following technical means.
[1] A light-emitting part in which a large number of LED elements are arranged, a heat dissipating member connected to the light-emitting part, and a base electrically connected to the light-emitting part. An LED lamp for a nuclear power generation facility, wherein the LED lamp is detachably mounted on a socket for a light bulb, wherein the heat dissipating member is in contact with a diameter-expanding member for the light bulb over a certain area.
[2] The LED lamp for nuclear power generation facilities according to [1], wherein the heat radiating member includes a plate-like body fixed in contact with a stepped portion of the diameter-expanding member.
[3] The LED lamp for a nuclear power generation facility according to [2], wherein the heat dissipating member can be fixed by being sandwiched between a step portion of the diameter-expanding member and an end of the globe joined to the diameter-expanding member. .
[4] The LED lamp for nuclear power generation facilities according to any one of [1] to [3], further comprising a movable mechanism that urges the base toward the heat dissipating member and fixes the base movably.
[5] The LED lamp for nuclear power generation facilities according to any one of [1] to [4], wherein the light emitting unit includes an LED module formed by connecting a large number of LED elements in series.
[6] The nuclear power generation facility LED lamp according to [5], wherein the light emitting unit is configured by connecting a plurality of the LED modules in parallel.
[7] The nuclear power generation facility according to any one of [1] to [6], further including a temperature rise suppression mechanism that controls resistance by operating a temperature switch according to a temperature change of the LED lamp. LED lamp.
[8] The nuclear power generation facility LED lamp according to [7], wherein the temperature rise suppression mechanism controls a corresponding resistance component in the circuit by controlling the number of lighting of the LED elements.
[9] The LED lamp for nuclear power generation facilities according to any one of [1] to [8], further comprising a power switch.
[10] The nuclear power generation facility LED lamp according to any one of [1] to [9], wherein the heat dissipating member is made of copper or graphite.
[11] An LED for a nuclear power generation facility, comprising: the LED lamp according to any one of [1] to [10]; a diameter-expanding member provided with a socket for a light bulb; and a globe joined to the diameter-expanding member. lighting equipment.
[12] The LED lighting apparatus for a nuclear power generation facility according to [10], wherein the globe is made of polycarbonate resin or polyarylate resin.

The main effects achieved by the present invention are as follows.
(1) Since a long life is realized by the LED lamp, the number of work for replacing the bulb due to natural wear is reduced.
(2) Since the opportunities for replacing the bulbs are reduced, accidents during bulb replacement operations such as falling from a high place and falling are reduced.
(3) During periodic inspection of nuclear reactor equipment, damage to glass globes and light bulbs due to collision with scaffolding materials can be reduced.
(4) By reducing the amount of discarded used incandescent bulbs, the amount of radioactive waste is reduced.
(5) Since an existing incandescent bulb socket or the like can be used as it is, the amount of waste at the time of replacement with an LED lamp can be minimized.
(6) The power consumption is reduced by the LED lamp.
(7) It is possible to provide a robust lighting device for a nuclear power generation facility that is less likely to drop or break even when an earthquake occurs.

It is principal part sectional drawing of the conventional lighting fixture for nuclear power generation facilities using an incandescent lamp. It is a graph which shows the relationship between the temperature of LED, and a lifetime. It is a principal part cross-sectional side view of the LED lighting fixture which concerns on Example 1. FIG. It is a principal part cross-sectional side view of the conventional socket holder (diameter expansion member). It is a principal part cross-sectional side view of the LED lighting fixture which concerns on Example 2. FIG. 6 is a top view of an LED lamp according to Example 2. FIG. It is explanatory drawing of the process which mounts an LED lamp in a socket. It is a circuit block diagram of the temperature control circuit of the LED lamp using a temperature switch. It is a graph which shows the simulation result of the voltage-current characteristic of the temperature control of an LED lamp. It is a circuit block diagram which added the power switch to the circuit of FIG. It is a graph which shows an example of the voltage and electric current characteristic of an LED element.

  A typical incandescent bulb has a rated life of 2,000 hours. When replacing an incandescent light bulb with an LED lamp, there is a need for a life as long as possible. For example, a life of 40,000 hours or more is required. According to this, the LED lamp must be able to maintain the performance required as the illumination means under the situation where it is exposed to radiation for a long period of 20 years or more in actual use, for example.

In the present invention, since the lifetime of the LED element as a light source is affected by the temperature of the LED, by providing a heat dissipation member with good heat dissipation efficiency, it is possible to suppress the temperature rise and extend the life of the LED. . At this time, it is also important to be able to divert as many existing parts (sockets, socket holders, gloves, etc.) as possible so as to minimize waste.
Moreover, although the glove which covers LED lamp can use the thing made from the conventional glass, the weight of a lighting fixture can be reduced by replacing this with a flame-retardant and light material, such as a polycarbonate. This makes it possible to provide a lighting apparatus for a nuclear power generation facility that is excellent in earthquake countermeasures.

Next, an example for carrying out the present invention will be described in comparison with a conventional incandescent bulb.
[1] Luminaire using a conventional incandescent bulb FIG. 1 is a cross-sectional side view of an essential part showing an example of a luminaire for a nuclear power generation facility using a conventional incandescent bulb. The lighting fixture includes an incandescent bulb 11, a socket 2, a socket holder (a diameter-expanding member) 3, and a globe 4 that covers the bulb, and the bulb is attached to an installation place such as a ceiling or a wall in a vertical direction.
The socket holder 3 is a socket cover in which the socket 2 is fixed, and is a bell-shaped casting having an enlarged diameter opening.
The globe 4 is made of glass and has a structure that is screwed into the screw groove 32 of the socket holder 3 and fixed. In addition, the rubber packing 10 is arrange | positioned at the step part in order to prevent the looseness of the screw which has attached the glass globe.

[2] LED lighting apparatus of the present invention The LED lighting apparatus of the present invention includes an LED lamp 1, a socket 2, a socket holder (diameter expanding member) 3, and a globe 4 that covers the LED lamp 1. In the LED lighting apparatus of the present invention, aluminum is not used in principle, and even if it is used in a very small amount, it is not used in an exposed state. Each element will be described in detail below.

[2-1] LED lamp The LED lamp 1 of the present invention suppresses the temperature rise of the LED by configuring the heat generated from the LED through the heat dissipating member so that it can be conducted and diffused to the socket holder 3 having a large heat capacity and surface area. It is characterized by.
The relationship between the LED temperature and the lifetime has been clarified. For example, in order to maintain the lifetime of about 40,000 hours, the LED temperature needs to be maintained at about 150 ° C. or less (see FIG. 2).
The LED lamp 1 according to the present embodiment includes a light emitting unit 5 having a large number of LED elements 51, a disk (plate-like body) 91 disposed above the light emitting unit 5, and a movable mechanism 7 joined to the disk 91. And a base 6 connected to the movable mechanism.
The light emitting unit 5 has a circuit configuration in which a plurality of LED modules formed by connecting a large number of LED elements 51 in series are connected in parallel. The number of LED elements 51 connected in series is determined by the power supply voltage and the voltage / current characteristics of the LED elements employed, and the brightness is adjusted by the number of LED modules connected in parallel. FIG. 11 shows an example of voltage / current characteristics of the LED element. The housing 52 in which the LED element 51 is disposed has a hollow bowl-like or lattice-like inner space, and is configured in such a shape that warmed air freely flows. The connecting member 92 is joined to the housing 52 and the disk 91 with a cross-sectional area of a certain level or more so that heat is efficiently transmitted. The casing 52, the disk 91, and the connecting member 92 are preferably made of copper or graphite. The disk 91 may be formed with heat radiating fins or a raised member for contacting the inner peripheral surface or inner edge of the socket holder 3.
The base 6 is of the same standard size as the incandescent bulb, and can be detachably attached to the bulb socket disposed in the socket holder 3.

[2-2] Socket and socket holder The socket 2 and the socket holder 3 can be used as they are for conventional incandescent lamps, but are not limited thereto.
The socket 2 of the present embodiment is a mogul socket.
Since the socket holder 3 has a function to disperse heat from the LED as a whole and to dissipate heat from the surface to the outside environment, the socket holder 3 needs to be a material having good heat conduction and good heat dissipation. Is suitable. The socket holder 3 of the present embodiment is cast iron. The socket holder 3 is formed with a step portion 31, and a contact area of a certain level or more is secured by bringing the upper surface of the disk 91 into contact with the lower surface of the step portion 31, and efficient heat dissipation is performed by heat conduction. Is possible.

[2-3] Temperature control corresponding to the voltage change of the LED lamp The voltage of the power supply used in the nuclear power generation facility may fluctuate, but when the voltage rises, the temperature of the LED rises and the life of the LED is reduced. It will be shortened. In particular, it is desirable to avoid an increase in temperature to 100 ° C. or higher because LEDs have a tendency to shorten their lifetime when the temperature during use is 120 ° C. or higher. When a large voltage fluctuation occurs, the temperature rise cannot be suppressed only by the heat radiation by the heat radiating member provided in the LED lamp, and it is desirable to provide a separate temperature rise suppression mechanism.
IC circuits are generally used for current and voltage control, but IC circuits do not function when exposed to radiation for a long period of time, so they are used in places where there is strong radiation such as in a containment vessel. It is not preferable to do. Although a certain level of voltage fluctuation can be absorbed by a simple circuit such as a Zener diode, it is desirable to provide a separate temperature rise suppression mechanism in order to cope with the voltage fluctuation in the nuclear power generation facility. Therefore, in the present invention, it is possible to cope with a temperature rise accompanying voltage fluctuation by controlling the number of LED elements energized by the temperature switch.

  Any temperature switch may be used as long as it is less affected by radiation, but a magnetic switch and a bimetal switch are preferred. As a method for controlling the temperature of the LED by the temperature switch, for example, a circuit for bypassing several (n) LEDs is provided in an LED module in which a large number (N) of LED elements are coupled in series, and the LED A device is disclosed in which the temperature is controlled by opening and closing a temperature switch according to the temperature of the lamp and causing N or Nn LEDs to emit light.

[2-4] Effect of radiation on equipment When a semiconductor is irradiated with radiation, the characteristics may be remarkably deteriorated. An example thereof is as follows.
(1) When γ-rays were irradiated to the LED driving IC, it stopped operating at all.
(2) When the neutron beam was irradiated to the diode, the IV characteristics (the most representative characteristic among the current-voltage characteristics and the electrical characteristics) decreased by 10% or more depending on the product. However, since there was a product that hardly deteriorated, a diode having no deterioration was selected and used in the LED lighting apparatus of the present invention. (3) When the LED was irradiated with a neutron beam, the IV characteristic was not deteriorated, but the emission intensity decreased by 10% or more.
From these facts, it has been found that it is preferable to use a component with high radiation resistance for the LED lighting apparatus for the containment vessel and to have a simple circuit configuration so as to reduce failure.
In the LED lighting apparatus of the present invention, no semiconductor is used other than the LED and the diode for full wave rectification in order to make the circuit configuration resistant to radiation. Thereby, it is possible to suppress deterioration of electrical and optical characteristics due to radiation as much as possible.

[2-5] Fixing of LED lamp with globe and material of globe The equipment installed in the nuclear power generation facility is required to have earthquake resistance. It is important not to lose the function due to the shaking of the earthquake, and to consider that there is no ripple effect on other facilities even if it is damaged. As described above, since the LED lamp for nuclear power generation facilities cannot use aluminum, it is considerably heavier than an incandescent bulb of about 150 g (for example, about 1.5 kg). Therefore, since the force applied to the socket base that is the socket mounting portion is increased by the vibration due to the earthquake, the same mounting method as that of the incandescent light bulb is likely to be damaged during the earthquake. Therefore, in the present invention, the heat dissipation member of the LED lamp is sandwiched between the globe and the socket holder and is firmly fixed to improve the vibration resistance (see FIGS. 3 and 5). By fixing the disk 91 in this way, the contact between the disk 91 and the socket holder 3 is good, and an effect that heat dissipation can be further improved can be obtained.

  Further, as described above, in the lighting equipment for nuclear power generation facilities, since the globe cannot be an open type, there is a limit in reducing the weight of the lighting device with the conventional glass globe. Therefore, in the present invention, the problem due to weight has been improved by configuring the globe with a flame-retardant and lightweight translucent material such as polycarbonate resin or polyarylate resin. However, in the LED lamp of the present invention, a conventional glass globe can be used as it is.

  Hereinafter, the present invention will be specifically described based on examples, but the present invention is not limited to the following examples.

The LED lamp 1 of Example 1 can be used with the lighting fixture installed in the reactor containment vessel of a pressurized water reactor (PWR). That is, the LED lamp 1 of Example 1 is used by being mounted on the conventional socket holder 3 shown in FIG.
The LED lamp of the present embodiment is configured as shown in FIG. 3, and includes a light emitting unit 5 having a large number of LED elements 51, a connecting member 92 joined to the light emitting unit 5, and a disk 91 disposed above the connecting member. And a base 6. The light emitting unit 5 has a circuit configuration in which LED modules A and B formed by connecting 88 LED elements 51 in series are connected in parallel. Each module is provided with a power resistor so as to absorb the influence of a certain voltage fluctuation (see FIG. 8). The casing 52, the disk 91, and the connecting member 92 are made of copper. In the internal space of the connecting member 92, a rectifier circuit storage is provided.
The base 6 was an E39 base.

  In the LED lamp 1 of the first embodiment, the light emitting portion 5 and the base 6 are not fixed, and the base is free. Therefore, the disk 91 is brought into contact with the socket holder 3 by the screwing pressure of the globe 4. . Here, since the socket holder 3 is a metal casting and the surface thereof is not flat and there are many portions where irregularities are formed, the disk 91 is sandwiched between the glove and the step 31 via the rubber packing 10.

  The LED lamp 1 of Example 1 having the above configuration can be used in place of an incandescent bulb that has been conventionally used in a lighting fixture in a nuclear reactor containment vessel.

The LED lamp 1 of the second embodiment is used by being mounted on the same conventional socket holder 3 as the first embodiment, and includes a movable mechanism 7 joined to the disk 91 and a base 6 connected to the movable mechanism. This is different from the first embodiment. Therefore, description of the same parts as those in the first embodiment is omitted, and the movable mechanism 7 will be described below.
The movable mechanism 7 includes a connection column 71 having one end fixed to the disk 91, a spring 72 through which the connection column 71 is inserted, and a support plate 73 through which the connection column 71 is inserted. There are four connecting struts 71 and four springs 72, and they are arranged as shown in FIG.
One end of the spring 72 is fixed by a collar provided at the upper end of the support column 71, and the other end is fixed by a support plate 73. The base 6 fixed to the support plate 73 by the spring 72 is normally biased downward (see FIG. 7A).

FIG. 7 is an explanatory diagram of the process of mounting the LED lamp 1 of this embodiment in the socket.
FIG. 7A shows a state in which the LED lamp 1 is inserted into the socket holder 3 from below and the base 6 is brought into contact with the inlet portion of the socket 2. At this stage, the support plate 73 is biased by the spring 72 and is in a state of being close to the disk 91.
FIG. 7B shows a state in which the LED lamp 1 is rotated, the base 6 is screwed into the socket 2, and the disk 91 is brought into contact with the step 31. At this stage, the support plate 73 is still biased by the spring 72 and is in a state of being close to the disk 91.
FIG. 7C shows a state in which the LED lamp 1 is further rotated and the base 6 is screwed deeper into the socket 2. At this stage, the support plate 73 compresses the spring 72 as the base 6 is raised, and the support plate 73 is separated from the disk 91. At this time, even if the socket holder 3 made of a casting has an irregular shape, the disk 91 can be reliably brought into contact with the socket holder 3 by the expansion and contraction of the spring 72.

  According to the LED lamp 1 of the second embodiment having the above-described configuration, the disk 91 can be reliably brought into contact with a certain area or more in the cast socket holder 3 installed in the conventional reactor containment vessel. It is.

Example 3 relates to the LED lamp provided with a temperature rise suppression mechanism in the LED lamp of Example 1 or 2.
The light emitting unit 5 of this embodiment has a circuit configuration in which LED modules A and B formed by connecting 88 LED elements 51 in series are connected in parallel. The LED module A has a first temperature switch (TRS1), and the LED module B has a second temperature switch (TRS2).
By providing a bypass circuit between the four LEDs A1 to B4 and between the four LEDs 89 to 92 and opening and closing the temperature switches TRS1 and TRS2 in each of the series A and B, 88 A first state in which the LEDs are connected in series and a second state in which the 84 LEDs are connected in series are realized. In the first state, the voltage per LED is low, and the current flowing through the circuit is small, so the amount of heat generation is reduced. In the second state, the voltage per LED increases, and the current flowing through the circuit increases, so the amount of heat generation increases. At the start, voltage is applied to 84 LED elements, and then the temperature switch is turned OFF when the temperature of the LED elements reaches, for example, 100 ° C. or more, and the temperature rise is suppressed by energizing the 88 LED elements. It is possible. In addition, the number of LED elements to bypass can be suitably selected according to conditions, such as the raise temperature of a lighting fixture. In addition, the operating temperatures of the A and B series can be shifted. For example, by setting the operating temperature of TRS1 to 95 ° C. and the operating temperature of TRS2 to 100 ° C., stepwise temperature control becomes possible.

  The temperature switch (TRS1, 2) is configured by combining a ring-shaped thermosensitive magnetic material, a permanent magnet, and a gap spacer, and inserting a reed switch into the hole at the center of the ring. The temperature-sensitive magnetic material is a soft magnetic ferromagnetic material at the Curie temperature, and the saturation magnetic flux density decreases as the temperature rises, and becomes a paramagnetic material when the Curie temperature is reached. A temperature-sensitive magnetic body that reacts to the ambient temperature changes the magnetic field (converts thermal energy into magnetic field energy), thereby opening and closing the switch.

  FIG. 9 shows the result of simulating current / voltage characteristics when the temperature control circuit shown in FIG. 8 is used. The number of LED elements to be energized is normally 84, and 88 when the temperature rises to 100 ° C. or higher. The voltage at which the number of LED elements switches between 84 and 88 (the voltage at which the temperature of the lamp becomes 100 ° C.) varies depending on the environmental temperature, but is preferably controlled so as to be in the range of the performance design voltage 200V to 221V. Control is performed so that it is at least in the range of safe design voltage 189V to 231V. In the case shown in FIG. 9, when the LED current reaches 150 mA, the lamp temperature becomes 100 ° C. Therefore, when the temperature switch is turned OFF so that 88 LEDs are operated at this time, the LED current suddenly increases. It has been shown that the lamp temperature decreases.

  According to the LED lamp 1 of Example 3 having the above-described configuration, the temperature of the LED lamp can always be maintained at a constant temperature or lower, so that a long life can be realized.

Example 4 relates to the LED lamp provided with the power switch in the LED lamp of Example 3.
The LED lamp 1 of the fourth embodiment has a power switch (SW1) between the power supply board and the base 6.
). According to the LED lamp 1 of the fourth embodiment, it is possible to safely replace the LED lamp without turning off the power of the section by turning off the power switch when replacing the LED lamp.

The LED lighting apparatus of the present invention provides a product that replaces an incandescent bulb installed in a reactor containment vessel with an LED lamp. The present invention realizes a long life of the lighting fixture and a reduction in power consumption by adopting the LED, and it is possible to reduce the replacement work due to the breakage or breakage of the lighting fixture. Provide a means for the operation of a modern nuclear power plant. Furthermore, according to the present invention, it is possible to provide a lighting device having a shape and size that can be used as is by using a lamp and a glove using a conventional incandescent bulb, so that replacement can be performed at low cost, and it is resistant to vibration, that is, an earthquake resistant structure. New lighting fixtures can be provided.
The present invention provides a lighting apparatus that operates stably in a high radiation environment, and is useful for contributing to the reduction of CO ₂ emissions by helping to operate a stable nuclear power generation facility. It is.

1: LED lamp 2: Socket (Mogal socket)
3: Socket holder (expanded member)
4: Globe 5: Light emitting part 6: Base (mounting part)
7: Movable mechanism 8: Rectifier storage part 9: Heat radiation member 10: Rubber packing 11: Incandescent light bulb 31: Step part 32: Screw groove 41: Umbrella part 42: Bottom part 71: Connection support 72: Spring 73: Support plate 51: LED Element 52: Housing 91: Disk (plate-like body)
92: Connecting member

Claims (12)

For a light bulb provided with a light emitting part provided with a large number of LED elements, a heat dissipating member connected to the light emitting part, and a base electrically connected to the light emitting part. An LED lamp that is detachably attached to a socket,
An LED lamp for a nuclear power generation facility, wherein the heat dissipating member is in contact with a light-bulb expanding member with a certain area or more.   2. The LED lamp for a nuclear power generation facility according to claim 1, wherein the heat radiating member includes a plate-like body fixed in contact with a step portion of the diameter-expanding member.   3. The LED lamp for a nuclear power generation facility according to claim 2, wherein the heat dissipating member can be fixed by being sandwiched between a step portion of the diameter-expanding member and an end portion of a globe joined to the diameter-expanding member.   The LED lamp for a nuclear power generation facility according to any one of claims 1 to 3, further comprising a movable mechanism that urges the base toward the heat dissipating member and fixes the base in a movable manner.   The LED lamp for a nuclear power plant according to any one of claims 1 to 4, wherein the light emitting unit includes an LED module formed by connecting a large number of LED elements in series.   The nuclear power generation facility LED lamp according to claim 5, wherein the light emitting unit is configured by connecting a plurality of the LED modules in parallel.   The LED lamp for a nuclear power generation facility according to any one of claims 1 to 6, further comprising a temperature rise suppression mechanism that controls resistance by operating a temperature switch in accordance with a temperature change of the LED lamp.   8. The nuclear power generation facility LED lamp according to claim 7, wherein the temperature rise suppression mechanism controls the corresponding resistance component in the circuit by controlling the number of lighting of the LED elements.   The LED lamp for a nuclear power generation facility according to any one of claims 1 to 8, further comprising a power switch.   The LED lamp for a nuclear power generation facility according to any one of claims 1 to 9, wherein the heat dissipation member is made of copper or graphite.   11. An LED lighting apparatus for a nuclear power generation facility comprising: the LED lamp according to claim 1; a diameter-expanding member in which a bulb socket is disposed; and a globe joined to the diameter-expanding member.   The LED lighting apparatus for nuclear power generation facilities according to claim 10, wherein the globe is made of polycarbonate resin or polyarylate resin.