JPH0355706A - Lighting equipment - Google Patents

Abstract

PURPOSE:To improve luminous efficacy by controlling a fan in such a manner that the temperature of a lamp tube wall detected by a temperature detecting means becomes a determined value, and changing the opening of a return hole for returned air to control the temperature of the tube wall of a fluorescent lamp. CONSTITUTION:A slit plate 7 is, for example, manually displaced, whereby the opening of a return hole 5 for regulating returned air is changed. A control means is integrally provided on a fan 8, and the flow rate of the returned air is controlled by the fan 8 in such a manner that the temperature of the tube wall of a fluorescent lamp 2 detected by a temperature detecting means becomes a determined value.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is provided by being embedded in a hole formed in, for example, a ceiling, for guiding return air after air conditioning to the ceiling. This invention relates to a lighting fixture provided with a return hole.

[Conventional technology]

In so-called recessed lighting equipment, a box-shaped equipment body is embedded in a recessed hole formed in the ceiling, and a lamp, reflective lamp, etc. are stored inside the equipment body. In order to ventilate (return air) from the ceiling, a device in which a return hole is provided in the main body of the device has been used. The return air from the room to be air-conditioned is brought up to the attic through the above-mentioned return hole by creating a negative pressure in the space under the attic, but at this time, it passes near the lamp. The return air removes heat from the tube wall of the lamp and cools the tube wall.

By the way, it is known that fluorescent lamps have the characteristic that their illumination intensity changes depending on the temperature of the tube wall.
The measurement results of the tube wall average temperature and illuminance characteristics by the inventor of the present invention are shown in FIG. It is understood from FIG. 4 that the highest illumination intensity can be obtained by maintaining the temperature of the tube wall of the fluorescent lamp within a certain predetermined range. In addition, as a result of measuring several combinations of fluorescent lamps and ballasts, the temperature of the coldest point at the bottom of the lamp center was 4.
It has been found that the illumination intensity is highest when the temperature is between 2 and 43 degrees Celsius.

[Problem to be solved by the invention]

In this way, in fluorescent lamps, what is the temperature of the tube wall? However, in conventional configurations, the flow rate of return air flowing near the fluorescent lamps is a constant value determined by the negative and positive values of the space in the attic. However, it is not always possible to cool the tube wall of a fluorescent lamp well, and therefore it is not possible to optimize the temperature of the tube wall. The purpose of this invention is to achieve the above-mentioned technical i! ! An object of the present invention is to provide a lighting device that solves the problem and improves luminous efficiency by controlling the temperature of the tube wall of a fluorescent lamp. [iI1! [Means for Solving the Problem] The lighting device according to claim (1) includes a fan that is provided in association with the return hole and adjusts the flow rate of return air near the tube wall of the lamp, and a fan that adjusts the flow rate of return air near the tube wall of the lamp. The present invention is characterized by comprising a temperature detection means for detecting the temperature, and a control means for controlling the fan so that the temperature of the tube wall of the lamp reaches a predetermined value when the output of the temperature detection means is applied. The lighting device according to claim (2) changes the opening degree of the return hole to reduce the tlLWk of the return air near the tube wall of the lamp.
an aperture variable means for adjusting the temperature of the tube wall of the lamp; a temperature detection means for detecting the temperature of the tube wall of the lamp; The present invention is characterized by comprising a control means for controlling the opening degree variable means.

[Effect]

According to the lighting device of claim (+1), the flow rate of return air in the vicinity of the lamp is adjusted by the rotational speed of a fan provided in connection with the return hole. is controlled by a control means based on the output from a temperature detection means for detecting the temperature of the lamp.The control means controls the fan so that the temperature of the tube wall becomes a predetermined value, and as a result, return air y
Lit is controlled to a flow rate suitable for cooling the tube wall of the lamp, thereby optimizing the temperature of the tube wall of the lamp. As a result, the illuminance of the lamp can be maintained at the maximum level regardless of the room temperature, etc., thereby contributing to an improvement in luminous efficiency.

In the lighting device according to claim (2), the flow rate of the return air for cooling the tube wall of the lamp is adjusted by controlling the opening degree of the return hole by the opening degree variable means,
As a result, the same effect as the lighting fixture according to claim (1) can be obtained.

〔Example〕

FIG. 1 is a perspective view showing the basic configuration of a lighting fixture according to an embodiment of the present invention. This lighting fixture has a box-shaped fixture body that is inserted into a roughly rectangular embedded hole (not shown) in the ceiling.
(Indicated by imaginary lines in FIG. 1). A straight tube-shaped fluorescent lamp 2, a reflector plate 3 for reflecting light from the fluorescent lamp 2 toward an object to be irradiated, and the like are housed within the main body of the apparatus. A partition plate 4 is provided behind the reflector plate 3 to partition the internal space of the instrument body 1 into upper and lower parts, and this partition plate 4 has a slit 5 as a return hole. In relation to this partition plate 4, a slit plate 7 in which a slit 6 aligned with the slit 5 is formed is attached to the fluorescent lamp 2 side of this partition plate 4 so as to be freely displaceable in the direction of arrow R1. By manually displacing the temporary slint 7, for example, the area of the common portion between the slit 5 and the slit 6 can be adjusted, so that the degree of opening of the return hole can be changed.

A fan 8 is attached to the upper part of the appliance body 1, that is, on the back side of the appliance body 1, for guiding the air inside the appliance body 1 to the space under the attic through a through hole (not shown) formed in the upper part of the appliance body 1. The reflector plate 3 consists of three parts 3a, 3b, and 3c extending along the longitudinal direction of the fluorescent lamp 2, and the return air after air conditioning in the room where this lighting equipment is installed is drawn from the space near the fluorescent lamp 2. , passes through the gaps between the respective parts 3a, 3b, and 3c of the reflecting plate 3, and further passes through the slit 56.
, and is guided from the fan 8 to the space behind the ceiling. This space behind the ceiling is exhausted by a ventilation system (not shown), and is kept under negative pressure.

Is the fan 8 controlled to change its operation into four stages, for example, stop, low-speed rotation, medium-speed rotation, and high-speed rotation? JIl means (
Not shown. ) is physically provided, and this control means includes, for example, a temperature detection means (not shown) that is fixed to the tube wall of the fluorescent lamp 2 on the reflection plate 3 side and detects the temperature of the tube wall of the fluorescent lamp 2. .) is given a temperature signal. Based on this temperature information signal, the control means controls the operation of the fan 8, thereby controlling the flow rate of return air in the space near the fluorescent lamp 2. As a result, the return air is deprived from the tube wall of the fluorescent lamp 2. By changing the amount of heat generated, the cooling efficiency of the tube wall of the fluorescent lamp 2 changes.

FIG. 2 is a flowchart for explaining the control process of the fan 8 by the control means. In step nl, the temperature T of the tube wall of the fluorescent lamp 2 is measured. That is, temperature information from the temperature detection means is taken into the control means.

Next, in step n2, the temperature T of the tube wall is set within a predetermined temperature range TL-T. Whether it is within the range of TL≦T<'r++... (1
)? It is decided whether or not it will be dignified. This degree range is the third
As shown in the figure, there is a temperature range ΔT near where the illuminance takes its maximum value, and this temperature range ΔT is, for example, a temperature range in which the temperature at the coldest point of the lamp is in the range of 42 to 43°C. If the judgment in step n2 is affirmative, the rotation speed in the current state is maintained at step n3, and if the judgment is negative, the process proceeds to step n5.

In Stenop n5, TN < T... (2)
It is determined whether That is, the temperature of the tube wall of the fluorescent lamp 2 detected by the temperature detection means is above the temperature range to be controlled @T. It is determined whether or not the sardine is being eaten. If this determination is affirmative, the process proceeds to step n6, where the rotation of the fan 8 is changed to a higher speed by one step.
In other words, stop ■ Low speed rotation Low speed rotation ■ Medium speed rotation Medium speed rotation ■ High speed rotation? As such, the rotational state of the fan 8 changes. This increases the flow rate of return air in the vicinity of the fluorescent lamp 2, increases cooling efficiency, and therefore lowers the temperature of the tube wall of the fluorescent lamp 2.

If the determination at step n6 is negative, the process proceeds to step n7, where the rotation of the fan 8 is changed to the lower speed side by one step. In other words, the rotation state of the fan 8 changes as follows: high speed rotation, medium speed rotation, medium speed rotation, low speed rotation, and ■ stop. As a result, the flow rate of return air near the fluorescent lamp 2 is reduced, cooling efficiency is reduced, and the temperature of the tube wall of the fluorescent lamp 2 is increased. If the determination in step n6 is negative, TNT. (3) Therefore, it is necessary to weaken the cooling of the tube wall of the fluorescent lamp 2, but the above-mentioned treatment meets this requirement.

From steps n3, n6, and n7, the process proceeds to step n4. In step n4, a certain period of time Δt is measured in order to take an interval for controlling the rotational speed of the fan 2, and when this elapsed time is over, the process returns to the stencil nl.
A measurement of the temperature of the tube wall is taken. In this way, the fan 8 is controlled at approximately time intervals of time ΔL.

As described above, according to this embodiment, by adjusting the flow rate of the return air near the fluorescent lamp 2 by controlling the rotational speed of the fan 8, the temperature of the tube wall of the fluorescent lamp 2 is maintained within the predetermined range TL-T. ．． controlled by. As a result, the illuminance of the fluorescent lamp 2 can be brought to almost the maximum level regardless of the room temperature, etc., so that the luminous efficiency can be significantly improved. In addition, for example, in conjunction with the lighting equipment of this embodiment, a plenum return is provided in which return slits and ponds are provided in the ceiling, and the space under the attic is used as an air chamber (plenum), allowing return air to flow through these and the lighting equipment. In addition, if the total ventilation amount is kept constant, desired air conditioning can be achieved, and therefore problems such as hindrance to air conditioning caused by driving the fan 8 for cooling the tube wall of the fluorescent lamp 2 can be avoided. It never comes to life. Furthermore, in this embodiment, by displacing the slit plate 7, the opening degree of the slit 5 can be changed, so the control width of the return air flow rate can be increased, and the fluorescent lamp 2 can be cooled to room temperature, etc. This can be done in an optimal manner.

In another embodiment of the invention, in the configuration shown in FIG. 1, the slit 4Ii7 is connected to a motor (not shown).

A control means is provided for controlling the motor based on temperature information from a temperature detection means for detecting the temperature of the tube wall of the fluorescent lamp 2. The fan 8 is driven to rotate at a constant speed. Even with such influence, by controlling the opening degree of the slit 5, it is possible to control the flow rate of return air in the vicinity of the tube wall of the fluorescent lamp 2 in order to obtain a desired cooling effect on the tube wall of the fluorescent lamp 2. The same effects as in the first embodiment can be obtained. In this embodiment, an opening degree variable means includes the slit plate 7 and the motor.

) In the first embodiment described above, the fan 8 whose rotation speed is variable is provided, and the slit plate 7 that changes the opening degree of the slint 5 is provided, but the temporary slint 7 is not necessarily provided. You can. Further, in the first embodiment described above, the fan 8 can be stopped, rotated at low speed, rotated at medium speed, etc. Although each state of high-speed rotation is provided, and the rotational speed is changed in four stages, so to speak, the rotational speed may be changed continuously.

Further, in the second embodiment described above, the slit plate 7 is displaced by a motor to change the opening degree of the slit 5, and a fan 8 that rotates at a constant speed is provided, but this fan 8 is not necessarily provided. Even if the plenum return is not performed, the flow rate of return air in the vicinity of the fluorescent lamp 2 can be effectively controlled if the plenum return is performed with the space under the ceiling in a negative pressure state. Furthermore, in the configuration of the second embodiment, the fan 8
If the rotational speed of the fluorescent lamp 2 is controlled together with the displacement of the slit plate 7, the control range can be further widened, and the temperature of the tube wall of the fluorescent lamp 2 can be controlled more optimally.

〔Effect of the invention〕

As described above, according to the lighting device of the present invention, the flow rate of the return air near the lamp is changed in accordance with the degree of curvature of the tube wall of the lamp, thereby optimizing the cooling of the tube wall of the lamp. The temperature of the lamp tube wall is maintained at a predetermined value. As a result, the temperature of the tube wall of the lamp can be reliably maintained at a temperature that maximizes the illuminance of the lamp, regardless of the room temperature, making it possible to significantly improve luminous efficiency.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the basic structure of a lighting fixture according to an embodiment of the present invention, FIG. 2 is a flowchart for explaining the control operation of the control means for controlling the fan 8, and FIG. 3 is a fluorescent FIG. 4 is a characteristic diagram showing the relationship between the temperature of the tube wall of lamp 2 and the illuminance in a simplified manner; FIG. be. 1... Appliance body, 2... Fluorescent lamp, 5... Surinoto (return hole), 7... Surino L-plate (means for varying opening degree), 8... Fan HP deaf socket A zu4=1 Figure 3/Group 1}・Voice^T TLTH Lap1

Claims (2)

[Claims] (1) In a lighting device in which return air after air conditioning is guided outside through a return hole provided on the back side of the device body housing the lamp, a lamp provided in association with the return hole and connected to the lamp a fan for adjusting the flow rate of the return air near the tube wall; a temperature detection means for detecting the temperature of the tube wall of the lamp; A lighting device comprising: control means for controlling the fan so that the fan is set to a certain value. (2) In a lighting device that guides return air after air conditioning to the outside through a return hole provided on the back side of the device body in which the lamp is housed, the opening degree of the return hole is changed to an opening degree variable means for adjusting the flow rate of the return air near the tube wall of the lamp; a temperature detection means for detecting the temperature of the tube wall of the lamp; A lighting device comprising: a control means for controlling the opening degree variable means so that the temperature becomes a predetermined value.