JPS63187130A - Radiation temperature detector - Google Patents

Abstract

PURPOSE:To perform fine air conditioning control by making it possible to detect only specific radiant heat, by additionally providing a heat collecting means for collecting a predetermined range of radiant heat in the receiving chamber of a heat insulating case. CONSTITUTION:Only the radiant heat of a floor within a predetermined range determined by heat collecting means 10, 11, 12 in the radiant heat from the floor, a wall or the like transmits through a radiant heat permeable film 8 at first and subsequently incident to a radiant heat absorbing plate 3 through an air heat insulating layer 9. The radiant heat is conducted to the radiant heat absorbing plate 3 and the radiation temp. thereof is detected by a temp. detection element 2. As mentioned above, since only the radiant heat within the predetermined range is collected by the heat collecting means, directionality is brought about and, since only the specific radiant heat can be detected, fine air conditioning control can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a radiation 11 installed in an indoor unit of an air conditioner, etc., for non-contact detection of radiant humidity from a wall, etc.
It concerns a 4 degree detector.

(Prior Art) In general, for example, in an air conditioner, an indoor unit installed indoors is equipped with an air temperature detector that detects the indoor air temperature and a radiant temperature detector that detects the radiant rJJ temperature of walls, etc. The indoor temperature 'ar* is adjusted to the set temperature based on these rain detection signals. The radiation rJ4 temperature detector in the air conditioner is a simple type that can be manufactured at low cost, and this simple type radiation temperature 1 detector is disclosed in Japanese Patent Application Laid-Open No. 149751/1983. There are some.

This radiant temperature sensor has a case whose front opening is open, and a temperature sensing element for detecting temperature is supported in a storage space located approximately in the center of the storage space, and the front opening of the case is covered with a transparent plate. On the other hand, the back of the case is covered with a heat insulating material.

Therefore, the radiant heat from the wall, etc., passes through the transparent plate and then travels through the storage space to reach the temperature sensing element, and the temperature sensing element
14 temperature is detected.

(Problems to be Solved by the Invention) In the radiation tJ4 temperature sensor described above, the temperature sensing element is simply supported in the center of the storage space, and only the surface of the sensing element is exposed to radiant heat, that is, from the wall etc. Since it serves as a heat receiving surface that receives the emitted heat rays, there is a problem that the amount of heat received is small, making it impossible to accurately detect the radiant temperature, making it impossible to perform accurate air conditioning control, etc.

In addition, although the temperature sensing element is covered with the above-mentioned transparent plate, some transparent plates, such as acrylic plates, transmit only visible light and do not transmit infrared light. Heat rays (radiant heat) with similar properties will not pass through,
There is a problem that the degree of gradient cannot be detected.

Further, although a temperature sensing element is provided within the storage space, there is a drawback that natural convection occurs within the storage space, and heat transfer due to this convection increases, so that the temperature sensing element does not detect the true radiant temperature.

Furthermore, since the front of the temperature sensing element in the above-mentioned radiant temperature detector is open in a hemispherical manner, it picks up most of the radiant heat coming from the front, making it impossible to detect only the radiant heat from a specific wall, etc. However, there were problems such as poor directivity and limited air conditioning control.

In view of these points, the present invention secures a large amount of heat by receiving radiant heat with a radiant heat absorbing plate, and at the same time, transmits infrared rays through an air insulation layer having a thickness that does not cause convection in front of the radiant heat absorbing plate. The purpose of this invention is to enable accurate detection of radiant heat within a predetermined area such as a wall with a simple structure by providing a heat collecting means as well as a permeable membrane.

(Means for Solving the Problems) In order to achieve the above object, the present invention has a storage chamber (5c) with an open front as shown in FIG. A heat insulating case (5) is formed. A radiant heat absorbing plate (3) for absorbing radiant heat is provided in the storage chamber (5c) of the heat insulating case (5) with its back surface covered by the heat insulating case (5). Further, a temperature detection element (2) is provided to detect the temperature of the radiant heat absorption plate (3). In addition, the front surface of the storage chamber (5c) of the insulation case (5) is covered with an air insulation layer (9) having a thickness that does not cause natural convection to the radiant heat absorption plate (3), so that the radiant heat is absorbed. A radiant heat transmitting film (8) made of an infrared transmitting material is formed. In addition, heat collecting means (10), (11), and (12) are provided to collect radiant heat in a predetermined range into the storage chamber (5c) of the heat insulating case (5).

(Function) With the above configuration, in the present invention, the heat collecting means (10) and (11) of the radiant heat from the floor, wall, etc.

Only the radiant heat from the floor, etc. within the specified range defined in (12)
First, after passing through the radiant heat permeable membrane (8), the air passes through the air insulation 11 (
9) and enters the radiant heat absorption plate (3). and,
The radiant heat is transmitted through the radiant heat absorption plate (3) and the temperature detection element (
2) detects the radiant temperature using this radiant heat.

Therefore, since the radiant heat is infrared rays, it reliably passes through the radiant heat transmitting film (8) made of polyethylene, polypropylene, etc. and is absorbed by the radiant heat absorbing plate (3). Moreover, since the air insulation layer (9) between the radiant heat permeable membrane (8) and the radiant heat absorbing plate (3) has a thickness that does not cause natural convection, the front surface of the radiant heat absorbing plate (3) is connected to the outside air. The heat conduction of the air alone ensures a reliable heat shield, and at the same time, radiant heat is reliably transferred. Furthermore, since the radiant heat absorption plate (3) receives radiant heat on its front surface and conducts it to the temperature detection element (2), the heat receiving surface becomes wider and the radiant temperature can be detected accurately, making air conditioning control etc. more accurate. can do well.

Furthermore, since the heat collecting means (10), (11), and (12) collect only the radiant heat from, for example, a specific floor, they have directivity and can be used for a wide range of air conditioning controls that match external conditions. It can be carried out.

(Example) ! An embodiment of the present invention will now be described in detail based on the drawings.

As shown in Fig. 1, (1) is a simple radiant temperature detector installed in an indoor unit such as an air conditioner, and a temperature detecting element (2) detects radiant heat from the floor, wall, etc.
This is a non-contact detection method.

The temperature detection element (2) is composed of a thermocouple that detects temperature, and is embedded in the center of the radiant heat absorption plate (3), and the temperature detection element (2) absorbs radiant heat from the front to the back. It is covered with a plate (3).

The temperature sensing element (2) is covered with a radiant heat absorbing plate.
3) It is designed to receive hot radiant heat from walls, etc. The radiant heat absorbing plate (3) has a paint layer (4) laminated on the front surface to absorb radiant heat, and on this front surface #i
The coating F1 layer (4) receives the absorbed radiant heat and transmits it to the temperature sensing element (2).

As shown in FIG. 3, the paint layer (4) is a paint having a spectral absorption rate that roughly matches the spectral reflectance of human skin or clothing, or conversely, the spectral absorption rate of human skin or clothing, such as tetrafluoride. Fluororesins such as ethylene resin (PTFE) and titanium oxide (Ti
02) and other pigments. The radiant heat transfer coefficient of the paint WJ (4) is made to approximately match the radiant heat transfer coefficient of the human body, etc., so that the radiant fJJ temperature with respect to the human body can be detected with high accuracy. That is, the spectral reflectance of skin and clothing is high in the visible light and near-infrared light regions, and close to zero in the infrared light region, so the paint layer (4) is made to correspond to this spectral reflectance, for example. We aim to obtain spectral radiation characteristics similar to those of the actual human body, such as skin color or cream color.

If the above paint GL (4) is a black paint, the reflectance in the visible light and near-infrared light regions will be close to zero, and it will absorb more heat from high-temperature heat sources such as sunlight than the actual human body, etc. It will be overestimated. Therefore, as described above, a skin-colored paint layer (4) is applied. .

The radiant heat absorption plate (3) is housed in a heat insulating case (5), which is made of heat insulating material and has a predetermined thickness, and has a side wall (5b) around the rear wall (5a). They are arranged in a row to form a U-shaped cross section, and the inside is configured as a storage chamber (5c). The radiant heat absorption plate (3) is connected and stretched at the side end of the side wall portion (5b), and the absorption plate (3)
is supported in parallel with the rear wall (5a) at a predetermined distance, and a rear air insulation layer (
6). The side and rear sides of the radiant heat absorbing plate (3) including the temperature sensing element (2) are shielded from external heat by the case (5) and the rear air insulation layer (6). Note that (7) is a lead wire of the temperature sensing element (2) that passes through the radiant heat absorption plate (3) and the case (5).

Further, in front of the radiant heat absorbing plate (3), a radiant heat transmitting film (8) is installed at a predetermined interval in the storage chamber (5) of the heat insulating case (5).
5c), and a front air insulation X1 (9) is formed between the permeable membrane (8) and the paint layer (4). The radiant heat transmitting plate 1 (8) is formed of a thin film made of an infrared Iil transparent resin such as polyethylene or polypropylene, and reliably transmits the radiant heat and supplies it to the radiant heat absorbing plate (3). The plate (3) is isolated from the outside air to prevent heat due to convection such as wind from being transmitted to the absorption plate (3). When the above-mentioned radiant heat transmitting film 8) is formed of polyethylene with a thickness of 30 μm, for example, its spectral transmittance becomes as shown in Fig. 4, and the wave number is 4000C.
Almost 90% of the infrared rays from I-1 to 500C11-1 are transmitted through, and the radiant heat that is heat rays (infrared rays) is reliably transmitted and transmitted to the radiant heat absorption plate (3). Further, the radiant heat transmission 1 m (8) may be formed by a cut-on filter that transmits only infrared rays having a wavelength of 6 to 7 μm or more, and only radiant heat may be transmitted to the radiant heat absorption plate (3).

On the other hand, the front air insulation 1t (9) has a radiant heat absorption plate (
3) Insulate the front and outside with an air layer.
Its thickness is set to such a value that natural convection does not occur.

In other words, as shown in Figure 5, when two flat plates are installed in parallel, the vertical axis is the distance between the plates, and the horizontal axis is the temperature difference between the plates, and natural convection occurs due to the temperature difference. The distance between the plates is expressed as actual mA. When the distance between the plates becomes larger than this actual LmA, natural convection occurs and heat transfer due to this convection increases. Therefore, if the thickness of the front air insulation layer (9) in this example is increased, the insulation effect will increase, but if it is made thicker than the solid line A, the insulation layer (9) will increase in thickness.
9), natural convection occurs and convective heat transfer occurs in addition to radiant heat, so much of the heat transferred to the absorption plate (3) as 5u+~10111111 is 11g1()1 heat that passed through the permeable membrane (8). It is configured so that

Furthermore, as shown in FIG. 2, a reflecting tube (10) is connected to the front surface of the radiant heat passing membrane (8), and the reflecting tube (10) absorbs radiant heat within a predetermined range, for example. It constitutes a heat collecting means that collects only the radiant heat emitted from the front wall. The reflector tube (10) is formed into a horn shape whose rear end almost coincides with the inner peripheral edge of the side wall portion (5b) of the heat insulating case (5), and which spreads outward from the rear end toward the front. Only the radiant heat in a predetermined range enters the reflector tube (10), and direct radiant heat transmission 'AM! In addition to passing through (8), the light is reflected from the inner surface of the reflecting tube (10) and passes through the transmission film (8).

The reflector tube (10) is formed of an aluminum plate, aluminum plating, nickel plating, gold plating, or the like.

Next, the detection operation of this radiation temperature detector (1) will be explained.

First, this radiation rJJ'aa detector (1) is installed in the indoor unit of the air peace apparatus, and the radiant heat emitted from the walls, floor, etc. is transmitted to the radiant heat transmission film (8) as heat rays.

At this time, since the reflector tube (10) is provided, only the radiant heat emitted from a specific wall in front of the reflector tube (10) is introduced into the reflector tube (10). Then, the radiant heat introduced into the reflective IJ (10) is directly transmitted to the radiant heat transmitting film (
In addition to being transmitted to the transmission film (8), it is also reflected by the inner surface of the reflection tube (10) and transmitted to the transmission film (8).

Thereafter, since the radiant heat permeable film (8) is formed of polyethylene, a silicon substrate, etc., the radiant heat will surely pass through and be transmitted to the paint layer (4) via the air insulation 11 (9). In this paint layer (4), radiant heat is absorbed in substantially the same way as human skin, clothing, etc., and then this radiant heat is transmitted to the radiant heat absorption plate (3). The temperature detection element (2) detects radiant humidity using the radiant heat transmitted from the radiant heat absorbing plate (3), and the indoor unit is controlled based on this temperature signal.

Therefore, in this radiant temperature detector (1), radiant heat is received on the front surface of the radiant heat absorbing plate (3), and the temperature sensing element (2) detects the radiant temperature from this radiant heat, so the amount of received radiant heat is large. Accurate radiant temperature will be detected.

In addition, the front of the radiant heat absorbing plate (3) is radiant heat transmitting wA (8
), it not only ensures that radiant heat passes through and is transmitted, but also reliably prevents the influence of external convective heat transfer caused by air blowing, etc. Furthermore, since the sides and rear of the radiant heat absorption plate (3) are covered with the heat insulation case (5), external heat is not transferred to the absorption plate (3), and the front air insulation Jl (9 ) is formed to a thickness that does not cause natural convection, so heat will not be transferred to the absorption plate (3) due to this convection, and the m degree detection element (2) will accurately detect radiant heat.

Furthermore, the reflector tube (10) provides directivity, and for example, the reflection tube (10) has directivity.
(10), it is possible to detect only the radiant heat of the cough wall, and air conditioning control that meets the conditions can be performed. Besides, this N! By providing a plurality of radiant humidity temperature detectors (1) and pointing them in different directions, or by rotating one radiant temperature detector (1) to detect and scan the room,
It is possible to detect the temperature distribution in the room, and perform precise air conditioning control that matches this temperature distribution.

FIGS. 6 and 7 show other heat collecting means, and the heat collecting means shown in FIG. 6 includes a reflecting mirror <11 ). The reflecting mirror (11) is a concave mirror that is curved concavely toward the front of the transmission film (8), and is formed into a spherical, parabolic, or ellipsoidal surface, and its focal point is located at the temperature sensing element (2). It is formed like this. Furthermore, the above is against! ) I mirror (11
) is made of an aluminum plate or the like like the reflector tube (10).

Therefore, this radiant temperature detector (1) is installed with the back side facing the front of the indoor unit, and the radiant heat from the front of this indoor unit is reflected by the mirror (11) and is reflected by the temperature sensing element (2). ).

Then, the reflecting mirror (11) gives a predetermined Ii! Surrounded by 4! ! Only radiant heat will be collected.

Further, the heat collecting means shown in FIG. 7 includes a radiant heat transmitting film (8) formed on a convex lens and the convex lens surface (12). The radiant heat transmitting film (8) is made of infrared transmitting crystal material such as Qe, KR8-5°KR8-6, Si, etc., in addition to resin such as polyethylene.

Therefore, the radiant heat is refracted by the convex lens surface (12) and transmitted to the temperature sensing element (2), and only the radiant heat within a predetermined range is detected.

Although the radiant temperature detector (1) of this embodiment has been described for the case where it is installed in an air conditioner, it goes without saying that it may be applied to a device that uses the temperature of the pond width Q4.

Further, the radiant heat absorbing plate (3) and the radiant heat transmitting film (8) do not need to be located in parallel, and may be curved instead of being flat.

Further, the rear air insulation layer (6) does not necessarily need to be formed.

(Effects of the Invention) As described above, according to the radiant temperature detector of the present invention, the temperature detection element detects the temperature of the radiant heat absorption plate, and the radiant heat is emitted from the front of the radiant heat absorption plate through the air insulation layer. Since the radiant heat absorbing plate receives radiant heat on its front surface and the temperature detection element detects the radiant temperature, the radiant heat absorbing plate receives radiant heat in front of it and the temperature sensing element detects the radiant temperature, so the radiant heat receiving area becomes larger and the amount of heat received increases. Since the radiant temperature is often accurately detected, air conditioning control and the like can be performed with high precision.

In addition, since the radiant heat transmitting film is made of an infrared transmitting material,
The radiant heat will surely pass through and be transmitted to the absorption plate. Further, since the air heat insulating layer is formed to a predetermined thickness of 5 ms+ to 101 m1, etc., natural convection does not occur, heat transfer due to convection can be reduced, and the accuracy of radiant temperature can be improved.

Furthermore, since the heat collecting means collects only the radiant heat within a predetermined range, it has directivity, and only specific radiant heat can be detected, allowing precise air conditioning control and the like.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which FIG. 1 is an enlarged longitudinal sectional view of a radiation temperature detector, and FIG. M2 is a schematic longitudinal sectional view of the same showing the whole. Figure 3 is a diagram showing the spectral radiation characteristics of the human body, etc.
The figure shows the spectral transmittance of the radiant heat transmitting film, and FIG. 5 shows the convection limit value of the air heat insulating layer. 6 and 7 are schematic longitudinal sectional views of a radiant humidity detector showing other heat collecting means, respectively. (1)...Radiant temperature detector, (2)...Temperature detection element, (3)...Radiant heat absorption plate, (4)...Paint layer,
(5)...insulation case, (5c)...storage chamber, (8
)...Radiant heat permeable membrane, ku)...Front air insulation layer,
(10)...Reflector tube, (11)...Reflector, (12
)...Convex lens surface. Figure 4 Value number (C♂) Figure 5 逼/'J Summer ('C) Figure 3

Claims (4)

[Claims] (1) A heat insulating case (5) made of a heat insulating material and having a storage chamber (5c) open at the front, and a back surface covered with a heat insulating case (5) inside the storage chamber (5c) of the heat insulating case (5). a radiant heat absorption plate (3) that is stretched in a stretched state and absorbs radiant heat;
A temperature detection element (
2), and the front surface of the storage chamber (5c) of the heat insulating case (5) is covered with an air heat insulating layer (9) having a thickness that prevents natural convection from occurring with respect to the radiant heat absorption plate (3). A radiant heat transmitting film (8) made of an infrared transparent material that transmits radiant heat and a storage chamber (5c) of the heat insulating case (5) transmitting radiant heat in a predetermined range.
1. A radiant temperature detector comprising: (10), (11), (12) for collecting heat. (2) The heat collecting means (10) includes the radiant heat transmitting film (
8), comprising a horn-shaped reflecting tube projecting from the front surface of the transmitting film (8) and expanding outward toward the front of the transmitting film (8). Temperature detector. (3) The heat collecting means (11) includes the radiant heat transmitting film (
The temperature sensing element (8) is provided in front of the temperature sensing element (
2) The radiant temperature detector according to claim 1, wherein the radiant heat from the rear is reflected by the reflecting mirror and collected on the temperature detecting element (2). (4) The heat collecting means (12) includes the radiant heat transmitting film (
8) is formed as a convex lens and is constituted by the surface of the convex lens.