JPH07123006B2 - Fluorescent tube pendant temperature rise prevention device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature rise prevention device for a lighting fixture that accommodates a fluorescent lamp such as a light bulb type equipped with a power control unit such as an inverter.

[0002]

2. Description of the Related Art Conventionally, incandescent light bulbs have been used as temporary lighting fixtures for construction work, etc. However, since the electricity charges for temporary installations increase, it takes a fraction of a fraction to obtain the same brightness as an incandescent light bulb. The electric bulb type fluorescent tube which can be used with the electric power of is attracting attention in terms of economy. This light bulb type fluorescent tube is made by folding the fluorescent tube into two or four.
A compact structure that is bent or bridge-connected in a folded manner, and can be configured in the same size as a conventional incandescent light bulb, and is equipped with an inverter that converts the electric power from the power line into a high-frequency current. Realizes low power consumption.

[0003]

However, when the above-mentioned fluorescent tube is heated at its end to apply a high voltage to the filament provided at the end of the tube, and a bulb-shaped fluorescent tube is hung from the socket, The inverter connected at the upper part of the fluorescent tube is likely to be heated and become high in temperature. Therefore, if a bulb-shaped fluorescent tube is housed in a sealed pendant that prevents the glass from scattering when the fluorescent tube is damaged, the internal temperature rises and the operation of electronic circuits such as the inverter becomes unstable. There were cases.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a sealed fluorescent tube pendant which ensures safety when the fluorescent tube is broken and has improved cooling capacity.

[0005]

According to the present invention, in a pendant for accommodating a fluorescent tube having a power control unit in a space defined inside by a combination of a cap and a globe, an opening is provided on an upper part of the cap. , Large diameter to connect the glove to the above
Part and small diameter part connected to this via a step part facing the inner circumference
And the fluorescent tube is placed in this small diameter part,
A plurality of through holes are provided at a predetermined interval in a substantially vertical direction.

Further, the step portion of the globe is formed below the connection position between the fluorescent tube and the power control portion.

Further, a heat radiating member protruding above the opening is provided in the above-mentioned cap.

Further, the area of the opening provided in the above-mentioned cap is set to be substantially equal to the area of the through hole provided in the step.

[0009]

Therefore, after the air flowing in from the plurality of through holes of the step portion is once lowered all around the inner circumference of the globe, the fluorescent tube and the power control section are cooled by the convection of the air, In order to discharge the heated air from the opening provided in the cover, the fluorescent tube and the power control section are cooled without requiring special power, and since many of the fluorescent tubes are covered by the small diameter part of the globe, Even if it breaks, it can provide a safe environment without scattering debris around it, and since the through hole of the step is formed almost vertically, it is possible to prevent foreign matter such as rainwater and dust from entering the inside of the glove. .

Further, since the step portion is formed below the connecting position of the power control portion and the fluorescent tube, the air intruding through the through hole can be smoothly lowered along the inner wall of the globe.
The generation of air convection can be promoted to cool the fluorescent tube and the power control unit.

Further, the heat dissipation area can be increased to promote heat dissipation of the power control section and the fluorescent tube due to heat conduction, and rainwater and dust can be prevented from entering and the power control section and the fluorescent tube can be protected.

Further, it is possible to equalize the discharge and inflow of air accompanying the convection of air generated inside the globe,
Can efficiently cool the inside with a minimum opening area,
By reducing the opening area, foreign matter such as rainwater and dust can be prevented from entering.

[0013]

EXAMPLE An example of the present invention is shown in FIGS.

In FIGS. 1 to 3, reference numeral 1 denotes a shade having a conical side surface and having a hemispherical top portion to form an upper portion of a pendant. The shade 1 is made of a metal such as aluminum having a high thermal conductivity. It is formed of a plate-shaped member.

A glove 2 formed of a cylindrical member having a lower end sealed in a hemispherical shape is coaxially coupled to the outer peripheral end of the shade 1 to form a space defined inside the shade 1 and the glove 2. The fluorescent tube 5 is housed in the central portion to form a closed pendant.

A pedestal 40 for fixing the socket 4 is fixed to the center of the inner circumference of the top of the shade 1, and the socket 4 is suspended from the center of the shade 1 in a substantially vertical direction. An opening 10 for inserting a cord (not shown) is provided at the top of the shade 1, and the shade 1 and the glove 2 are suspended by the inserted cord. A bush 12 made of rubber or the like is fixed to the inner periphery of the opening 10 to prevent the cord (not shown) from being damaged by the end of the shade 1.

From below the socket 4, a fluorescent tube 5 integrally formed with an inverter 3 as a power control unit is screwed. The fluorescent tube 5 has a U-shaped central portion,
A filament (not shown) is provided in the vicinity of the connection portion with the inverter 3 which is the end portion of the fluorescent tube 5.

The globe 2 is made of light-transmissive resin or the like having a predetermined thickness, and a flange portion 2C is formed at the upper end thereof. The outer diameter of the flange portion 2C is set to be slightly smaller than the inner diameter of the end portion of the shade 1.
A large-diameter portion 2A having a predetermined outer diameter is formed in a cylindrical shape from the inner circumference of the globe 2. On the predetermined lower side from the position where the inverter 3 and the fluorescent tube 5 are connected, the outer diameter of the globe 2 is larger than the large-diameter portion 2A. A small diameter portion 2B that is sufficiently small and has a predetermined gap with the fluorescent tube 5 is formed on the inner circumference, and the lower end of this small diameter portion 2B is sealed by a hemispherical portion 21.

Below the connection position between the inverter 3 and the fluorescent tube 5 where the outer diameter of the globe 2 is smaller than that of the large diameter portion 2A, a step portion 20 connecting the large diameter portion 2A and the small diameter portion 2B of the globe 2 is provided. It is formed with a predetermined inclination toward the inner circumference. The inclination angle is set to a predetermined angle close to horizontal.

The step portion 20 is provided with an elliptical through hole 7 having a predetermined area in the vertical direction which is substantially parallel to the axis of the globe 2. As shown in FIG. 2, the through hole 7 has a step portion. It is formed at predetermined intervals over the entire circumference of 20.

At three places on the inner circumference of the flange portion 2C formed on the upper end of the globe 2, there are mounting holes for inserting metal fittings 22 formed in a U shape for connecting the globe 2 to the shade 1. 23 is provided, and the metal fitting 22 is provided in the mounting hole 23.
And the flange portion 2C is engaged therewith, the bolt 24 is inserted from above into a through hole (not shown) provided at a predetermined position of the shade 1, and the glove 2 is screwed into the metal fitting 22 so that the glove 2 is shaded. Bind to.

On the side surface of the shade 1, exhaust ports 6 formed of arc-shaped openings are arranged at concentric predetermined intervals, and from the upper end of the exhaust port 6 a predetermined length in a substantially horizontal direction. The heat radiation fins 11 are formed as the heat radiation members projecting at. The ends of the heat radiation fins 11 project from the lower ends of the exhaust ports 6 toward the outer periphery of the shade 1, and the upper portions of the exhaust ports 6 are covered by the heat radiation fins 11. The total opening area of the exhaust ports 6 provided over the entire circumference of the shade 1 is set to be substantially equal to the total opening area of the through holes 7 provided in the step portion 20.

With the above construction, the operation will be described below.

A pendant in which a fluorescent tube 5 equipped with an inverter 3 is housed inside the shade 1 and the globe 2 is hung at a predetermined position by a cord (not shown) and then energized.

As the power is supplied, the fluorescent tube 5 is lit by the high frequency current supplied from the inverter 3, and the fluorescent tube 5 mainly generates heat at its end portion with this lighting. The inverter 3 and the socket 4 are also heated by heat conduction due to the heat generation of the fluorescent tube 5, and the air inside the globe 2 is also heated to generate convection.

The heated air is heated on the surface of the fluorescent tube 5 and then rises along the end of the fluorescent tube 5 and the surface of the inverter 3, as shown by the arrow in FIG. It is discharged from the mouth 6 to the outside. A part of this ascending airflow enters the inside of a slit (not shown) of the inverter 3 and is discharged from the upper portion to cool the inside of the inverter 3.

On the other hand, by this convection, outside air is introduced from the through hole 7 provided in the step portion 20 of the globe 2 at the connection position of the inverter 3 and the fluorescent tube 5. The unheated air flowing upward from below the through hole 7 descends along the inner circumference of the small-diameter portion 2B of the globe 2 due to its specific gravity, and is then heated at the lower end of the fluorescent tube 5 as described above. Rise to.

The air heated on the surface of the fluorescent tube 5 rises along the surface of the inverter 3, while the air flowing from the through hole 7 of the step portion 20 descends on the inner circumference of the globe 2 and then the fluorescent tube 5 moves. By repeating the cycle of heating, the fluorescent tube 5
The inverter 3 and the inverter 3 can radiate heat to the air to suppress a rise in temperature and keep the temperature inside the globe 2 within a predetermined temperature range.

The through hole 7 provided in the step portion 20 is provided in the inverter 3
Since it is formed in a substantially vertical direction below a connection position between the fluorescent tube 5 and the fluorescent tube 5, it prevents rainwater and dust from entering and
Air flowing in from the outside of the globe 2 can descend toward the hemispherical portion 21 along the inner circumference of the small diameter portion 2B, and the fluorescent tube 5 is not affected by the ascending air current heated on the surface of the fluorescent tube 5. It is possible to introduce outside unheated air to the lower end of the, and efficiently generate convection to suppress the temperature rise inside the globe 2. Further, since the lower end of the globe 2 is sealed by the hemispherical portion 21, when the fluorescent tube 5 is damaged due to an impact or the like, fragments are not scattered to the outside of the pendant.

The opening area of the exhaust port 6 of the shade 1 and the step portion 2
By making the opening area of the through hole 7 of 0 substantially equal, it is possible to equalize the discharge and inflow amount of air due to the convection of the air generated inside the globe 2, and the inside area can be efficiently set with the minimum opening area. Cooling can be performed, and by reducing the opening area, invasion of foreign matter such as rainwater and dust can be prevented.

On the other hand, the heat generated by the fluorescent tube 5 is also conducted to the socket 4 via the inverter 3, but when the socket 4 is heated, the heat is transmitted by the shade 1 via the pedestal 40. The heated shade 1 radiates heat to the outside air from the radiation fins 11 projecting from the upper part of the exhaust port 6 and the upper surface of the shade 1, and also to the air from the inside of the globe 2 discharged from the exhaust port 6. The heat can be dissipated, and the rise of the temperature of the inverter 3 can be suppressed to obtain a stable operation.

Here, the radiating fins 11 not only radiate the heat conducted from the socket 4 to cool the shade 1, but also project so as to cover the exhaust port 6 from above, so that rainwater and dust are absorbed in the glove 2. It is possible to prevent the fluorescent tubes 5 and the inverter 3 from being invaded, and to maintain the performance of the fluorescent tube 5 and the inverter 3.

In this way, the inverter 3 and the fluorescent tube 5 are
The air flowing in from the through hole 7 of the step portion 20 provided at the connection position is once lowered along the inner circumference of the globe 2, and then the fluorescent tube 5 and the inverter 3 are cooled by the convection of the air to exhaust the shade 1. Since it is discharged from the mouth 6, it becomes possible to cool the fluorescent tube 5 and the inverter 3 without requiring special power. Since the fluorescent tube 5 is covered with the globe 2, even if it breaks, the fragments are surrounded. It can provide a safe environment without being scattered. Further, since the through hole 7 of the step portion 20 is penetrated in the vertical direction and the heat radiation fin 11 of the shade 1 is projected like an eaves-like shape at the upper portion of the exhaust port 6, rainwater and dust can be collected without the need of a filter device such as a filter. Invasion can be prevented and the inverter 3 and the fluorescent tube 5 can be protected.

In the above embodiment, the step portion 20 is provided with an inclination close to horizontal, but any shape that allows the through hole 7 to be formed in a substantially vertical direction may be used. For example, although not shown, 30 degrees to 60 degrees. Even if the step portion 20 having an inclination of about a degree is formed of a thick member and the through hole 7 is provided in the vertical direction, the same operation and effect as those of the above-described embodiment can be obtained.

Further, although the globe 2 is made of a cylindrical member in the above embodiment, it may be made of a polygonal cylindrical member or the like, although not shown, and the through hole 7 and the exhaust port 6 are also shaped. It can have any shape.

In the above embodiment, the total opening area of the exhaust ports 6 and the total opening area of the through holes 7 are set to be substantially equal to each other, but when there is no risk of foreign matter entering the inside of the globe 2. For example, the opening area of the through hole 7 may be increased without increasing the area, or the opening area of the exhaust port 6 may be increased to improve the cooling effect.

Further, although the step portion 20 is formed over the entire circumference in the above embodiment, it may be formed partially although not shown.

[0038]

As described above, according to the present invention, the air flowing in from the plurality of through holes provided in the step portion is once lowered all around the inner circumference of the globe, and then the air is convected. After cooling the fluorescent tube and the power control unit, the heated air is discharged from the opening in the cap, so it is possible to cool the inside of the pendant without requiring special power, and power control is possible. the operation of the parts can be kept performance of the fluorescent tube with stabilizing small glove many fluorescent tubes
Since it is covered with the diameter part , even if it breaks, it can provide a safe environment without scattering fragments around.

Further, since the step portion of the globe is formed below the connecting position of the fluorescent tube and the power control portion, the air flowing in through the through hole provided in the step portion smoothly descends along the inner circumference of the globe. Therefore, the convection of air can be promoted and the cooling efficiency can be improved.

Further, since the through hole of the step portion is vertically penetrated and the radiating member of the bulge is projected like an eave at the upper part of the opening, rainwater and dust are prevented from entering and the power control section and the fluorescent tube are prevented. Can be protected.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a view on arrow AA of FIG.

FIG. 3 is a partial sectional view of a shade.

[Explanation of symbols]

 1 Shade 2 Globe 3 Inverter 4 Socket 5 Fluorescent tube 6 Exhaust port 7 Through hole 11 Radiating fin 20 Step section

Claims (4)

[Claims] 1. A pendant for accommodating a fluorescent tube having a power control unit in a space defined inside by a combination of a cap and a globe, wherein an opening is provided at an upper part of the cap.
On the large diameter part that connects the glove to the above and the inner circumference
It is formed from a small diameter part that is connected via a stepped part facing
A fluorescent tube pendant temperature rise preventing device , wherein a fluorescent tube is arranged in a small diameter portion, and a plurality of through holes are provided in the stepped portion at a predetermined interval in a substantially vertical direction. 2. The temperature rising prevention device for a pendant of a fluorescent tube according to claim 1, wherein the stepped portion of the globe is formed below a connection position between the fluorescent tube and the power control section. 3. The temperature rising prevention device for a pendant of a fluorescent tube according to claim 1 or 2, wherein a heat dissipation member protruding above the opening is provided in the cap. 4. The fluorescent tube according to claim 1, wherein the area of the opening provided in the cap is substantially equal to the area of the through hole provided in the step. Pendant temperature rise prevention device.