Lighting fixtures

Abstract

To ensure that a water supply pipe is comprised in a luminaire to be installed outdoors, and reduce thermal stress of a light source.SOLUTION: A luminaire 1 comprises an LED 300, an appliance body 2 supporting the LED 300, and a water supply pipe 4 housed in the appliance body 2. The water supply pipe 4 comprises a main pipe 41, and a plurality of branch pipes 42 branching from the main pipe 41. The appliance body 2 comprises a plurality of discharge ports 22 corresponding to respective tips of the plurality of branch pipes 42 on a one-to-one basis, and for discharging water flowing through the plurality of branch pipes 42.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to lighting fixtures, and more particularly to lighting fixtures that are installed outdoors. [Background technology]

[0002] Conventionally, lighting fixtures for outdoor use such as road lights and street lights have been provided. For example, Patent Document 1 describes a lighting fixture that is attached to the tip of a road light pole (lighting pole). The lighting fixture body of the lighting fixture incorporates an LED board on which an LED (Light Emitting Diode) is mounted as a light source, a power supply board for turning on the LED, and the like. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-208189 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, lighting fixtures installed outdoors are prone to becoming hot when exposed to direct sunlight, and there is a risk that the thermal stress will accelerate the deterioration of the light source (LED).

[0005] An object of the present disclosure is to provide a lighting fixture that can reduce thermal stress outdoors. [Means for solving the problem]

[0006] A lighting fixture according to an aspect of the present disclosure includes a solid-state light source, a fixture body supporting the solid-state light source, and a water supply pipe housed inside the fixture body. The water supply pipe has a main pipe and a plurality of branch pipes branched off from the main pipe. A connecting portion for connecting another main pipe to the main pipe is provided at an end of the main pipe. The connecting portion includes a connecting pipe made of a flexible material and a joint. The joint includes a male threaded portion attached to the other end of the connecting pipe, a nut that engages with the male threaded portion, and a male threaded portion other than the male threaded portion that is connected to the other main pipe via a connecting pipe other than the connecting pipe, and is configured to connect the connecting pipe to the other connecting pipe by fitting the nut to the male threaded portion and the other male threaded portion with the male threaded portion and the other male threaded portion aligned in a straight line.The fixture body has an accommodation space for accommodating the water supply pipe, and a plurality of outlets which correspond one-to-one to the ends of the plurality of branch pipes and discharge water flowing into the plurality of branch pipes, and is thermally coupled to the plurality of branch pipes. Heat is exchanged between the fixture body and the water in the plurality of branch pipes, thereby cooling the solid-state light source via the fixture body. Effect of the Invention

[0007] The lighting fixture of the present disclosure has an advantage of being able to reduce thermal stress outdoors. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of a lighting fixture according to an embodiment of the present disclosure attached to a lighting pole. [Diagram 2] FIG. 2 is a block diagram of the lighting fixture, lighting pole, and water supply system. [Diagram 3] FIG. 3 is a cross-sectional view of the above lighting fixture. [Figure 4] FIG. 4 is a perspective view of a connecting portion in the lighting fixture. [Diagram 5] FIG. 5 is a perspective view of a connector in the lighting fixture. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, a lighting device according to an embodiment of the present disclosure will be described in detail with reference to the drawings. However, each figure described in the following embodiment is a schematic diagram, and the ratio of the size and thickness of each component does not necessarily reflect the actual dimensional ratio. Note that the configuration described in the following embodiment is merely an example of the present disclosure. The present disclosure is not limited to the following embodiment, and various modifications are possible depending on the design, etc., as long as the effects of the present disclosure can be achieved.

[0010] A lighting fixture 1 according to the embodiment (hereinafter, abbreviated as lighting fixture 1) is a lighting fixture for outdoor lighting (road lighting) that is attached to a lighting pole 5, which is a type of lighting pillar, as shown in FIG. 1, and illuminates the roadway or sidewalk around the lighting pole 5.

[0011] The lighting pole 5 is made of a steel pipe and formed into a cylindrical shape with a hollow interior. For example, a first end (lower end) of the lighting pole 5 is buried and fixed in the ground. The lighting fixture 1 is attached to a second end (upper end) of the lighting pole 5. A flow path 50 (see FIG. 2) is housed inside the lighting pole 5. A first end (lower end) of the flow path 50 is connected to the water supply facility 6. A power supply device (not shown) is housed inside the lighting pole 5. The power supply device converts, for example, AC power supplied from a power system into DC power and supplies it to the lighting fixture 1. Therefore, an electric circuit (power cable) for supplying DC power from the power supply device is also housed inside the lighting pole 5.

[0012] The water supply facility 6 includes a pump 60 and a water tank 61 (see FIG. 2). The water tank 61 is installed on the ground or buried underground. The water tank 61 stores water (tap water) supplied from a waterworks, for example. However, the water tank 61 may be configured to be buried underground and store rainwater.

[0013] The pump 60 sucks up water stored in the water tank 61 and sends it out to the flow path 50. The pump 60 is controlled by the control device 7, and can adjust the amount of water sent out to the flow path 50 per unit time.

[0014] As shown in FIGS. 1 and 3, the lighting fixture 1 includes a light source unit 3, a fixture body 2 that supports the light source unit 3, and a water supply pipe 4 housed inside the fixture body 2.

[0015] The light source unit 3 includes an LED module 30, a mounting member 31, and a cover 32. The LED module 30 includes an LED substrate 301 formed in a long rectangular shape, and a plurality of LEDs 300 (solid-state light sources) mounted at equal intervals on the surface (lower surface) of the LED substrate 301 (see FIG. 3). The mounting member 31 is formed in a long rectangular shape from a metal material such as aluminum or an aluminum alloy. The LED module 30 is attached to the center of the width direction (short direction) on the lower surface of the mounting member 31. The cover 32 is formed in a long trough shape from inorganic glass or organic glass. The cover 32 houses the plurality of LEDs 300 inside and is attached to the lower side of the mounting member 31 (see FIG. 2). The LED module 30 is electrically connected to a power supply device via a power cable housed in the lighting pole 5, and is turned on by DC power supplied from the power supply device via the power cable.

[0016] The fixture body 2 is formed into a long rectangular tube shape by extrusion molding of aluminum or an aluminum alloy, for example. Inside the fixture body 2, an accommodation space 20 is formed, the cross section of which is rectangular when cut along a plane perpendicular to the longitudinal direction (see FIG. 3). A mounting member 31 of the light source unit 3 is attached to the lower surface of the fixture body 2. Here, the LED module 30 of the light source unit 3 is thermally coupled to the fixture body 2 via the mounting member 31. Therefore, heat generated by the LED module 30 during lighting is thermally conducted from the mounting member 31 to the fixture body 2, and dissipated from the fixture body 2.

[0017] The water supply pipe 4 has a main pipe 41 and a plurality of branch pipes 42 branching off from the main pipe 41 (see FIG. 3). The main pipe 41 is formed in an elliptical cylindrical shape from a metal material such as stainless steel. The tip of each of the plurality of branch pipes 42 is formed in a funnel shape. The water supply pipe 4 is accommodated in the accommodation space 20 of the fixture body 2 such that the pipe axis direction (longitudinal direction) of the main pipe 41 coincides with the longitudinal direction of the fixture body 2.

[0018] Here, the ends of the branch pipes 42 correspond one-to-one to the outlets 22 provided on the side surface along the longitudinal direction of the instrument body 2, and are connected one-by-one to the outlets 22. Note that the outlets 22 in the instrument body 2 are each provided with a flow rate adjustment valve 23 (see FIG. 3).

[0019] For example, the lighting fixture 1 supplies DC power from the power supply device to the light source unit 3 around sunset to turn on the light source unit 3. On the other hand, during the day (for example, the period from sunrise to sunset), the lighting fixture 1 turns off the light source unit 3. Then, when the maximum daytime temperature is 30 degrees (or 35 degrees) or higher, water is supplied from the water supply equipment 6 to the water supply pipe 4 of the lighting fixture 1. The lighting fixture 1 cools the fixture body 2 and the LED module 30 of the light source unit 3 by exchanging heat between the fixture body 2, which has been warmed by sunlight and outside air, and the water in the water supply pipe 4.

[0020] Moreover, the water supplied from the water supply equipment 6 passes through the multiple branch pipes 42 of the water supply pipe 4 and is discharged from each of the multiple outlets 22. In other words, the water heated by heat exchange is discharged from the multiple outlets 22 to the outside of the water supply pipe 4, so that the rise in the water temperature in the water supply pipe 4 can be suppressed, and the temperature rise of the LED module 30 can be suppressed.

[0021] Furthermore, the water in the water supply pipe 4 is discharged in mist form from each of the multiple outlets 22. When the water discharged in mist form from the multiple outlets 22 evaporates, the temperature around the lighting fixture 1 drops. Therefore, by discharging cooling water from the multiple outlets 22 of the fixture body 2, the lighting fixture 1 can lower the surrounding temperature and make pedestrians feel cooler.

[0022] Further, a flow rate adjustment valve 23 is provided for each of the multiple outlets 22 in the fixture body 2. Therefore, the amount of water discharged from the outlets 22 can be adjusted by the flow rate adjustment valve 23. For example, by the flow rate adjustment valve 23 increasing the flow rate (the amount of water discharged from the outlets 22) in accordance with an increase in the temperature, it is possible to improve the heat dissipation performance of the lighting fixture 1 and reduce the surrounding temperature.

[0023] Incidentally, in the lighting fixture 1, the ends (both longitudinal ends) of the main pipe 41 are provided with a connecting portion 43 for connecting another main pipe (a main pipe of a water supply pipe provided in another lighting fixture 1) (see FIG. 4). The connecting portion 43 has a connecting pipe 430 and a joint 431 (see FIG. 4). The connecting pipe 430 is preferably formed of a flexible material such as synthetic rubber. One end of the connecting pipe 430 is connected to the tip of the main pipe 41. An opening 24 is provided on the tip surface of the fixture body 2, and the connecting pipe 430 can be drawn out of the fixture body 2 from this opening 24.

[0024] The joint 431 has a male threaded portion 432 attached to the other end of the connecting pipe 430, a nut 433 that fits with the male threaded portion 432, and a male threaded portion 434 that is connected to another main pipe via another connecting pipe 435. In other words, the joint 431 connects the two connecting pipes 430, 435 together by fitting the nuts 433 to the male threaded portions 432, 434 with the two male threaded portions 432, 434 aligned in a straight line. The connecting portion 43 is pushed into the accommodation space 20 through the opening 24 of the device body 2.

[0025] Furthermore, the fixture body 2 is provided with a waterproof connector 8. The connector 8 has a plug connector 80 and a receptacle connector 81 (see FIG. 5). The plug connector 80 is provided at the rear end of the fixture body 2, and the receptacle connector 81 is provided at the front end of the fixture body 2. That is, the LED modules 30 of the two lighting fixtures 1 are electrically connected to each other via the connector 8. The two lighting fixtures 1 are mechanically connected by an appropriate method such as screw fastening. However, when connecting multiple lighting fixtures 1 as described above, it is preferable that the multiple lighting fixtures 1 are installed on the roof of a building or on the parapet of a bridge, rather than on a lighting pole 5.

[0026] As described above, the lighting fixture (1) according to the first aspect includes a solid-state light source (LED 300), a fixture body (2) that supports the solid-state light source, and a water supply pipe (4) housed inside the fixture body (2). The water supply pipe (4) includes a main pipe (41) and a plurality of branch pipes (42) branched off from the main pipe (41). The fixture body (2) includes a plurality of outlets (22) that correspond one-to-one to the ends of the plurality of branch pipes (42) and that discharge water flowing into the plurality of branch pipes (42).

[0027] The lighting fixture (1) according to the first aspect cools the fixture body (2) and the solid-state light source by exchanging heat between the fixture body (2) and the water in the water supply pipe (4), thereby reducing thermal stress outdoors.

[0028] The lighting fixture (1) according to the second aspect can be realized by combining it with the first aspect. In the lighting fixture (1) according to the second aspect, the fixture body (2) is preferably attached to a lighting pole (lighting pole 5). The main pipe (41) is preferably connected to the water supply facility (6) via the lighting pole.

[0029] The lighting fixture (1) according to the second aspect can be installed at a high place using a lighting pole.

[0030] The lighting fixture (1) according to the third aspect can be realized in combination with the lighting fixture (1) according to the first or second aspect. In the lighting fixture (1) according to the third aspect, it is preferable that a connection part (43) for connecting another main pipe is provided at an end of the main pipe (41).

[0031] The lighting fixture (1) according to the third aspect can be connected to another lighting fixture by a connecting portion (43) and can supply water to the water supply pipe of the other lighting fixture.

[0032] The lighting device (1) according to the fourth aspect can be realized by combining with any one of the aspects 1 to 3. In the lighting device (1) according to the fourth aspect, it is preferable that the plurality of outlets (22) discharge water in the form of a mist.

[0033] The lighting fixture (1) according to the fourth aspect discharges water heated by heat exchange from the multiple outlets (22) to the outside of the water supply pipe (4), thereby suppressing an increase in the water temperature in the water supply pipe (4) and suppressing an increase in the temperature of the solid-state light source. Furthermore, the lighting fixture (1) according to the fourth aspect can lower the surrounding air temperature when the mist of water discharged from the multiple outlets (22) evaporates, making pedestrians feel cooler.

[0034] The lighting device (1) according to the fifth aspect can be realized by combining with any one of the aspects 1 to 4. In the lighting device (1) according to the fifth aspect, it is preferable that a flow rate adjustment valve (23) capable of adjusting a flow rate is provided in each of the plurality of outlets (22).

[0035] The lighting fixture (1) according to the fifth aspect can further reduce thermal stress outdoors by adjusting the flow rate with the flow rate adjustment valve (23). [Explanation of symbols]

[0036] 1 Lighting equipment 2. Equipment body 4 Water supply pipe 5 Lighting poles (lighting columns) 6 Water supply equipment 22 Discharge port 23 Flow control valve 41 Main 42 Branch Pipe 43 Connecting part 300 LEDs (solid light source)

Claims

1. A solid-state light source; A fixture body supporting the solid-state light source; A water supply pipe accommodated inside the appliance body; Equipped with The water supply pipe includes a main pipe and a plurality of branch pipes branched from the main pipe, A connecting portion is provided at an end of the main pipe for connecting another main pipe to the main pipe, The connecting portion includes a connecting pipe formed of a flexible material and a joint, the joint has a male threaded portion attached to the other end of the connecting pipe, a nut that engages with the male threaded portion, and a male threaded portion other than the male threaded portion that is connected to the other main pipe via a connecting pipe other than the connecting pipe, and is configured to connect the connecting pipe and the other connecting pipe by fitting the nut to the male threaded portion and the other male threaded portion with the male threaded portion and the other male threaded portion aligned in a straight line, the device body has an accommodation space for accommodating the water supply pipe, and a plurality of outlets each corresponding to one of the ends of the plurality of branch pipes and for discharging water flowing into the plurality of branch pipes, and is thermally coupled to the plurality of branch pipes; The solid-state light source is cooled via the fixture body by performing heat exchange between the fixture body and water in the plurality of branch pipes. Lighting fixtures.

2. The fixture body is attached to a lighting pole, The main pipe is connected to a water supply facility via the lighting pole.

2. A lighting device according to claim 1.

3. The plurality of outlets eject the water in the form of a mist.

3. A lighting fixture according to claim 1 or 2.

4. A flow rate control valve capable of adjusting a flow rate is provided at each of the plurality of discharge ports. A lighting fixture according to any one of claims 1 to 3.

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