JPH0539946A - Air conditioner - Google Patents

Abstract

(57) [Summary] [Purpose] Air that can detect the radiant heat temperature by making it difficult to be affected by the heat and air currents from the outside world, maintaining good directional sensitivity, and ensuring sufficient infrared transmittance. Provide a harmony machine. [Structure] A pair of radiant heat detectors 2A and 2B for detecting the temperature by collecting the radiant heat energy held by the wall surface / floor surface from the directions adjacent to each other are arranged side by side, and the front side of these radiant heat detectors is infrared rays. The infrared light having the radiant heat energy is transmitted by being covered with the permeable film 11, and the radiant heat detecting portions are blocked and held in the same space to make the heat influence from the outside uniform, and an air conditioner is provided on the front side of the infrared permeable film. The front panel 12 of the main body 15 is arranged with a gap between them to provide mechanical protection for the infrared ray transmissive film, and the long slits 13 are provided in this front panel in the direction in which the radiant heat detecting portions are arranged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner equipped with a radiant heat detecting means for detecting a radiant heat temperature from a wall surface or a floor surface.

[0002]

2. Description of the Related Art In an air conditioner, a radiant heat temperature sensor is attached to, for example, a lower part of a front surface of an indoor unit to catch heat radiated from an indoor wall or floor to indirectly detect the temperature of the wall or floor. , There is one that adds the detected temperature to the air conditioning control. However, the conventional radiant heat temperature sensor can only capture the temperature at a limited location in one direction.

On the other hand, there is a radiant heat temperature sensor disclosed in Japanese Patent Application Laid-Open No. 63-231134, which detects the temperature of a wide range. As a heat collecting means for collecting radiant heat in a predetermined range, the sensor portion is formed in a convex shape, and the left and right or upper and lower visual fields are made independent.

Alternatively, in the air conditioner disclosed in Japanese Patent Laid-Open No. 61-149751, the back side is covered with a heat insulating material,
A sensor case whose surface is covered with a transparent plate is provided, and a temperature sensor element for radiation is additionally provided inside the sensor case.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the case of Japanese Patent Laid-Open No. 3-231134, since a plurality of sensors are arranged in independent spaces, there is a problem in that uniformity is lacking with respect to thermal influence from the outside. Since the sensor portion is formed in a convex shape, there is exposure from the mounting surface, which causes a difference in the influence of the left and right air flows.

Further, in the case where the reflecting cylinder is formed in front of the radiant heat transmitting film, there is a problem that the reflecting cylinder causes the size of the device to be large. When a convex lens or the like is used as the heat collecting means, the lens itself absorbs infrared rays, and the heat collecting power is small, resulting in poor sensitivity. Therefore, it is necessary to use a very expensive lens or a sensor having a very high sensitivity, which adversely affects the cost.

In the above-mentioned Japanese Patent Laid-Open No. 61-149751, since the transparent plate is covered with a thick acrylic plate, there is no problem in strength, but on the other hand, the infrared transmittance is significantly attenuated. However, a decrease in detection accuracy cannot be avoided.

The present invention has been made in consideration of the above circumstances, and an object of the present invention is to make it less susceptible to the influence of heat and air flow from the outside world, and to maintain a good directional sensitivity. An object of the present invention is to provide an air conditioner capable of detecting radiant heat temperature while ensuring sufficient infrared transmittance.

[0009]

In order to satisfy the above-mentioned object, a first aspect of the present invention is a pair of radiant heat detectors for directing heat from radiant heat energies held by wall surfaces, floor surfaces, etc. from directions adjacent to each other and detecting the temperature. Parts are arranged side by side, and the front side of these radiant heat detecting parts is covered with an infrared transmitting film to transmit infrared light having radiant heat energy, and each radiant heat detecting part is blocked and held in the same space to evenly affect the heat from the outside world. The front panel of the air conditioner body is placed on the front side of this infrared ray transmissive film with a gap to provide mechanical protection against the infrared ray transmissive film.The front panel has a long slit in the direction in which the radiant heat detectors are arranged. An air conditioner characterized by being provided.

In a second aspect of the present invention, the front panel is formed of a material having a low emissivity, or is treated to reduce the emissivity. It is a machine.

[0011]

Since the pair of radiant heat detectors are covered with the infrared ray permeable film that blocks and holds them in the same space and are in the same air layer, even if they are affected by heat from the outside, they are affected by the same degree, There is no difference in detection accuracy.

Since the front panel of the main body of the air conditioner is opposed to the front surface side of the infrared transmitting film with a gap, it provides mechanical protection for the infrared transmitting film. Since the slits provided here are long in the direction in which the radiant heat detectors are arranged, the slits secure a sufficient amount of infrared light to be transmitted and minimize the sensitivity deterioration due to secondary radiation from the front panel.

All of the front panel or the portion where the slits are provided is formed as a separate piece and is made of a material having a low emissivity, such as an aluminum material panel, a stainless material panel, a white synthetic resin material panel, or the emissivity. The secondary radiation from the front panel is suppressed to a minimum by performing such a treatment that lowers the temperature, such as a plating treatment of aluminum or the like, a transfer treatment of a vapor deposition film, or the like.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a radiant heat temperature sensor S housed in the air conditioner body.

In the figure, reference numeral 1 is an opening 1 on the front side which is rectangular.
In the casing 1, a pair of radiant heat detectors 2A and 2B are arranged side by side. Between the back side of these radiant heat detectors 2A and 2B and the inside of the casing 1,
The heat insulating material 3 is filled.

The radiant heat detectors 2A and 2B are arranged in the horizontal direction in the drawing in the left-right direction, and are arranged in the vicinity of the focal positions of a pair of reflecting mirrors 4a and 4b that are integrally provided in series. Heat receiving plates 5a, 5b and each heat receiving plate 5a,
The temperature sensors 6a and 6b are attached to the respective 5b.

The peripheral ends of the reflecting mirrors 4a and 4b are fixed by a pressing plate 7, and the reflecting mirrors 4a and 4b are, for example, parabolic mirrors having the same curvature, which are press-formed products of metal thin plates. Alternatively, it can be obtained by surface-plating a resin molded product. Mutually, the axes 8a and 8b are located at the center position,
Different directivities are provided in the left and right directions so as to intersect at a point on the central axis 9 that is inclined inwardly at the same angle with respect to each other and extends from the connection position of the reflecting mirrors 4a and 4b.

Therefore, the field of view as the reflecting mirrors 4a and 4b largely intersects with the front surface of the casing opening 1a, but the edge line along the mutual connecting portions becomes a thermal boundary line in effect, and the reflecting mirrors 4a and 4b. 4b itself is in a thermally separated state. The heat receiving plates 5a and 5b are disk-shaped here, and are formed of, for example, a thin glass plate in order to reduce the heat capacity of themselves.

The heat receiving plates 5a and 5b are provided with elongated bridge fixing members 10 in order to suppress heat conduction from the outside.
It is supported at a predetermined position by a and 10b. The temperature sensors 6a and 6b for detecting radiant heat are adhered and fixed to the rear surface side of the reflecting mirrors 4a and 4b facing the mirror surface by using a heat conductive adhesive. The signal outputs of these temperature sensors 6a and 6b are taken out by lead wires (not shown) connected to the temperature sensors 6a and 6b.

The temperature sensors 6a and 6b are heat receiving plates 5a and 5 supported by elongated bridge fixing bodies 10a and 10b.
Since it is attached to b, it is in a state of floating in the air together with the heat receiving plates 5a and 5b, and the influence of heat conduction is extremely small. Further, since the back surfaces of the heat receiving plates 5a and 5b have high reflectance, secondary radiation from the back surfaces to the temperature sensors 6a and 6b is also reduced.

The front opening 1a of the casing 1 for accommodating the radiation detecting portions 2A and 2B has a thickness of 100 μm, for example.
It is closed by the infrared ray transmissive film 11 made of a polyethylene sheet. From this fact, only infrared rays are transmitted into the casing 1, and the influence of the blown airflow in the external environment is not affected.
a, 5b and the temperature sensors 6a, 6b, etc. are not reached.

The radiant heat temperature sensor S thus constructed is attached to the indoor unit Y of the air conditioner.
That is, the front panel 1 of the indoor unit Y of the air conditioner
2 and the infrared permeable film 11 face each other with a gap.

At least the front panel 12 is generally
Alternatively, only the portion where the slits 13 are provided needs to be formed of a material having a low emissivity, for example, an aluminum material, a stainless material, or a white synthetic resin material panel. Instead of these materials, a treatment to reduce the emissivity, for example, a plating treatment of aluminum or the like may be performed.

A plurality of slits 13 ... As shown in FIGS. 1 and 2, are provided at a portion of the front panel 12 facing the infrared ray transmitting film 11. The longitudinal direction of these slits 13 must be aligned with the direction in which the radiant heat detectors 2A and 2B are arranged side by side for the reason described later. Since the radiant heat detecting portions 2A and 2B are arranged side by side in the horizontal direction, the slits 13 are also formed to be long in the horizontal direction.

Next, the reason why the longitudinal direction of the slits 13 coincides with the arranging direction of the radiant heat detecting portions 2A and 2B will be described. In FIG. 3, only one reflecting mirror 4a is shown here.
Represents the field of view of. When the front panel 12 arranged in front of the infrared permeable film 11 is provided with, for example, a plurality of slits a ... Which are long in the vertical direction orthogonal to the horizontal direction, the field of view is preliminarily oriented in a direction inclined with respect to the front panel 12. Therefore, the number of parts blocked by the remaining panel parts b ...

That is, the ineffective portion of the visual field range blocked by the remaining panel portions b increases, and as a result, the transmission area for the slit a originally obtained as the effective visual field portion is narrowed.

As described above, the longitudinal direction of the slit 12 should not be oriented in the direction orthogonal to the direction in which the radiant heat detecting portions 2A and 2B are arranged side by side.
It is formed in the horizontal direction that coincides with the direction in which A and 2B are arranged in parallel. As a result, the ineffective portion is extremely small, and the effective visual field portion can be made wider and longer.

As shown in FIGS. 4 and 5, the radiant heat temperature sensor S is mounted in the indoor unit Y of the air conditioner.
The indoor unit Y is provided with an air intake port 16 in the upper front portion of the air conditioner body 15 and an air outlet 17 in the lower front portion. The radiant heat temperature sensor S is arranged inside the air outlet 17 laterally.

From the structure of the radiant heat detectors 2A and 2B,
As shown in FIG. 4, these visual field ranges are distributed to the left and right when viewed from the front of the indoor unit Y, and as shown in FIG. 5, they match when viewed from the side.

Next, attached to the indoor unit Y,
The operation of the radiant heat temperature sensor S will be described. When heat is radiated from the wall surface or floor surface, the radiant heat energy becomes infrared light and is projected onto the radiant heat temperature sensor S.

That is, as shown in FIG. 6 and FIG.
Radiant heat energy is projected to the radiant heat temperature sensor S in the indoor unit Y from the field-of-view range on the floor and the wall surface of the air-conditioned room R that is lined up in the left and right.

As shown in FIG. 1 again, the radiant heat energy that has become infrared light is transmitted through the slits 13 of the front panel 12 and the infrared permeable film 11 and projected onto the reflecting mirrors 4a and 4b, where it is focused. Reflects in a narrowed state.

The radiant heat energy reflected by the reflecting mirrors 4a, 4b is concentratedly taken in by the heat receiving plates 5a, 5b and transmitted to the temperature sensors 6a, 6b. Each temperature sensor 6
The temperature detected by a and 6b is output to the outside through a lead wire. The radiation exchange heat quantity Q of the wall surface or floor surface, which is the heat receiving surface, is expressed by the following equation. Q = Ε _r · Ε _w · F · K · A _p · σ (T _r ⁴ -T _w ⁴ ) · Η − Ε _r · Ε _p · F · (1-K) · A _p · σ (T _p ⁴ -T _r ⁴ ) ・ Η Q: Radiation exchange heat (Kcai / h) Ε _r : Heat-receiving plate emissivity Ε _w : Wall and floor emissivity F: Form factor K: Effective field ratio (effective field / total field) A _p : Reflection Mirror projected area σ: Boltzmann constant T _r : Radiation detection temperature (° K) T _w : Wall and floor temperature (° K) T _p : Front panel temperature η: Polyethylene infrared transmittance

The field of view range of such a radiant heat temperature sensor S is, here, the mutual reflection mirrors 4 arranged side by side.
The inclination angles of the axes 8a and 8b of a and 4b, the curvature as a parabolic mirror, the diameter areas of the heat receiving plates 5a and 5b, and the reflecting mirror 4.
It can be freely adjusted by setting various distances between the a and 4b and the heat receiving plates 5a and 5b.

In particular, since the temperature sensors 6a and 6b are arranged in a state of floating in the air together with the heat receiving plates 5a and 5b and are in the same air layer in the casing 1 by the infrared ray transmitting film 11, even if there is an influence of external heat. Even if there is, it will be affected in the same way, and the detection accuracy of the left-right difference can be kept high.

Since the infrared ray permeable film 11 is provided so as to close the front opening of the casing 1, at the same time as transmitting infrared rays, it prevents dust and the like floating in the air-conditioned room R from entering the inside.
Therefore, the reflectance of the reflecting mirrors 4a and 4b does not decrease. Further, since the infrared transmitting film 11 is configured to be protected by the front panel 12, it is possible to prevent the infrared transmitting film 11 from being broken by a finger or a stick.

Since the longitudinal direction of the slits 13 is aligned with the direction in which the radiant heat detecting portions 2A and 2B are arranged, the effective visual field portion can be widened in the visual field range of the respective reflecting mirrors 4a and 4b, and the front panel 12 is provided. It is possible to suppress the secondary radiation from the minimum and secure an effective visual field for difference detection.

Since the front panel 12 is processed to reduce the emissivity such as a material having a low emissivity such as an aluminum material or a plating treatment such as an aluminum, the secondary radiation from the front panel 12 is minimized. Suppress to the limit. In addition, the radiant exchange heat quantity Q of the wall surface or floor surface described above
In the equation for obtaining, the negative heat quantity shown below − (Manas code), that is,

Ε _r · Ε _p · F · (1-K) · A _p · σ
(T _p ⁴ -T _r ⁴ ) .Eta. Is nothing but the amount of secondary radiation heat of the front panel 12. With the above configuration, the front panel 12
Since the amount of secondary radiant heat from is reduced, the required amount Q of radiant exchange heat can be sufficiently secured.

As shown in FIG. 8, the radiant heat detecting portions 2A, 2 in the casing 1 which are shielded by the infrared ray transmitting film 11 are shown.
In the front space 18 of b, the left and right reflecting mirrors 4a, 4b
A reference temperature sensor 19 for detecting the temperature of the space portion 18 may be provided at a position deviated from the axes 8a and 8b passing through the focal point of.

In this case, the temperature sensors 6a and 6b attached to the heat receiving plates 5a and 5b receive the radiant heat energy on the left and right, while the reference temperature sensor 19 does not receive the radiant heat energy from the position setting. .. Further, the temperature sensors 6a and 6b and the reference temperature sensor 19 are connected to an electric circuit as shown in FIG.

That is, the power supply terminals 20a of the terminal board 20,
A series circuit of the resistor 21 and the temperature sensor 6a is connected between the terminals 20g. Power terminal 20a, 20g of terminal board 20
A series circuit of the resistor 22 and the temperature sensor 6b is connected to each other. Furthermore, the power supply terminals 20a, 20 of the terminal board 20
A series circuit of the resistor 23 and the reference temperature sensor 19 is connected between g.

The voltage Va generated in the temperature sensor 6a and the voltage (reference voltage) Vc generated in the reference temperature sensor 19 are input to the differential amplifier circuit 24. This differential amplifier circuit 24
Is composed of an operational amplifier 25, an input resistor R ₁ and a feedback resistor R ₂ , and outputs a voltage V _{1 of} a level corresponding to the difference between the input voltages Va and Vc. This output voltage V ₁ is expressed by the following equation and is applied between the terminals 1 a and 1 g of the terminal board 20. _{V 1 = Va- (Vc-Va} ) R 2 / R 1

The voltage Vb generated in the differential amplifier circuit 24 and the voltage (reference voltage) Vc generated in the reference temperature sensor 19
Are input to the differential amplifier circuit 26. The differential amplifier circuit 26 includes an operational amplifier 27, an input resistance R ₁ , and a feedback resistance R ₂
And outputs a voltage V _{2 of} a level corresponding to the difference between the input voltages Va and Vc. This output voltage V
₂ is represented by the following formula, and the terminals 20b, 2 of the terminal board 20 are
It is applied between 0 g. _{V 2 = Vb- (Vc-Vb} ) R 2 / R 1

Therefore, the voltage V
By taking out ₁ and V ₂ , the amount of radiant heat energy in the left and right visual field ranges detected by the temperature sensors 6a and 6b is used as the reference temperature sensor 19 under the condition that the thermal influence from the outside is uniform in the same space 18. Can be detected as the difference between the two, and a detection value with high relative accuracy can be obtained.

[0046]

As described above, according to the present invention, a pair of radiant heat detectors are arranged side by side, the front side of these radiant heat detectors is covered with an infrared permeable film, and a gap is present on the front side of the infrared permeable film. Since the front panel of the air conditioner body is provided with long slits in the direction in which the radiant heat detectors are arranged, the radiant heat detectors are less likely to be affected by heat and airflow from the outside world, and have good directional sensitivity. The temperature of the radiant heat can be detected by maintaining the temperature of the infrared rays to secure sufficient infrared transmittance. Also, from the longitudinal setting of the slits provided on the front panel, the field of view area that is invalidated by the slits is minimized to secure the amount of radiant heat.
It is possible to suppress a decrease in sensitivity due to secondary radiation. The infrared transparent film is protected by the front panel on the front side, and has an effect that it is not broken by a finger or a stick.

[Brief description of drawings]

FIG. 1A is a cross-sectional plan view of a radiant heat temperature sensor showing an embodiment of the present invention. (B) is a front view of the radiant heat temperature sensor with a part omitted. (C) is a vertical cross-sectional view of the radiant heat temperature sensor.

FIG. 2 is a front view of a slit portion of the front panel.

FIG. 3 is an operation explanatory view of a radiant heat temperature sensor when slit directions are different.

FIG. 4 is a perspective view of an air conditioner indoor unit including a radiant heat temperature sensor.

FIG. 5 is a side view of the air conditioner indoor unit.

FIG. 6 is a plan view of an air-conditioned space showing a visual field range of a radiant heat temperature sensor.

FIG. 7 is a side view of an air-conditioned space showing a visual field range of a radiant heat temperature sensor.

FIG. 8 is a cross-sectional plan view of a radiant heat temperature sensor showing another embodiment of the present invention.

FIG. 9 is an electric circuit diagram of the embodiment.

[Explanation of symbols]

2A, 2B ... Radiant heat detector, 11 ... Infrared transmitting film, 13
… Slits, 15… Air conditioner body, 12… Front panel.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yoshitaka Warashina 336 Tatehara, Fuji City, Shizuoka Prefecture Toshiba Corporation Fuji Factory

Claims (2)

[Claims] 1. A pair of radiant heat detectors arranged in parallel to collect radiant heat energy held by a wall surface / floor surface from a direction adjacent to each other to collect the heat and detect the temperature, and to cover front faces of the radiant heat detectors. An infrared transparent film that transmits infrared light having radiant heat energy and that keeps each radiant heat detection unit in the same space to evenly affect the heat from the outside, and there is a gap on the front side of this infrared transparent film. An air conditioner comprising: a front panel of an air conditioner main body, which is provided with long slits arranged in the direction in which the radiant heat detectors are arranged, and which mechanically protects the infrared permeable film. 2. The air conditioner according to claim 1, wherein the front panel is formed of a material having a low emissivity or is treated so as to have a low emissivity.