JPH0716981Y2 - Air conditioner temperature sensor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a temperature sensor for an air conditioner.

[Prior Art] FIG. 3 is a perspective view showing a temperature sensor disclosed in, for example, Japanese Utility Model Laid-Open No. 59-151127, and FIG. 4 is a sectional view taken along line IV-IV in FIG.

In FIGS. 3 and 4, 1 is a plate portion made of a thermistor substrate, 2 is a thermistor adhered to one surface of the plate portion 1 by means such as printing, 3 is a heat insulator fixed to one surface of the plate portion 1, Four
Is a black body paint that covers the other surface of the plate.

The operation of the temperature sensor configured as above will be described. First, the electromagnetic waves included in the infrared region from the visible light from the periphery of the plate portion 1, that is, the radiant energy, is first blackened paint
Is absorbed by the plate portion 1 according to the absorption rate of. Radiant energy is also radiated from the plate portion 1 to the surroundings in accordance with the emissivity of the blackbody paint 4, and when the temperature of the plate portion 1 is higher than the surroundings, the radiation amount is larger than the absorption amount. The temperature of 1 drops further with respect to the ambient air temperature. As a result, the resistance of the thermistor 2 changes, and the air temperature around the temperature sensor corrected by the radiant energy is detected.

However, the temperature sensor described in Japanese Utility Model Laid-Open No. 59-151127 detects the temperature in which both the air temperature around the temperature sensor and the radiant energy are taken into consideration, but the actual sensible temperature is affected by the air flow. There is a problem in that the sensible temperature is not detected.

As a temperature sensor which solves this problem and also considers the influence of the air flow, there is a thermal environment measuring machine described in JP-A-53-176, or a temperature sensor as shown in FIG.

The thermal environment measuring device described in Japanese Patent Laid-Open No. 53-176 is modeled on a human arm and includes a soaking cylinder made of metal such as aluminum and a heater wire wound around the soaking cylinder. And a sensing element including a thermal resistor provided on the outside of the soaking cylinder and the heater winding, and a temperature measuring element provided on the inside of the soaking cylinder, and the sensing element. It is composed of an electric circuit and an indicator for measuring the output change of the sensitive element, and the thermal environment is detected by detecting the change of the output signal of the temperature measuring element with respect to the temperature, wind speed, humidity, etc. while keeping the heater current constant. It is something to measure.

The temperature sensor shown in FIG. 1 also detects the temperature close to the sensible temperature in consideration of the effects of the air temperature, the radiant energy and the air flow. Plate 1, plate thermistor 2 for detecting the temperature of plate 1, plate 1
The electric heater 5 for heating the room temperature, the thermistor 6 for detecting the room temperature, and the lead wire 6a for holding the thermistor 6 for detecting the room temperature. The thermistor 2 detects the temperature rise value of the plate portion 1 when the plate portion 1 is heated by the heater 5, and calculates the sensible temperature based on the detected value. That is, the temperature rise of the plate portion 1 is reduced when the airflow level or the radiation level is large, and the sensible temperature is similarly reduced when the airflow level or the radiation level is large.

[Problems to be Solved by the Invention] Although the thermal environment measuring device described in Japanese Patent Laid-Open No. 53-176 considers the influence of air flow, it has the following problems. That is, in order to detect the sensible temperature more accurately, it is necessary to independently adjust the sensitivity to the radiation level and the sensitivity to the airflow level, but in order to change the sensitivity to the radiation level in this thermal environment measuring instrument, The emissivity of the outer surface of the thermal resistor must be changed,
Changes such as changes in materials and surface roughness are required, which is not easy and also greatly affects the sensitivity to the air flow level. Also, to change the sensitivity to the air flow level, the amount of heat applied to the heater may be changed, but since this thermal environment measuring device matches the heat radiation characteristics with the human body, the surface temperature of the thermal resistor outside the room temperature is sufficient. If the amount of heat applied to the heater is high, the temperature of the outer surface of the thermal resistor changes significantly, which affects the radiation of radiation energy and changes the sensitivity to the radiation level. Furthermore, since the heat radiation characteristics are made to match those of the human body, there is a problem that the amount of heat applied to the heater becomes large, and that the cylindrical shape is inconvenient to attach to the air conditioner.

Further, the temperature sensor shown in FIG. 1 has a problem in that it is not possible to change the amount of radiant energy emitted from the plate portion 1, so that the sensitivity to the radiation level cannot be adjusted.

The present invention has been made to solve the above problems, and takes into consideration the effects of air temperature, radiant energy, and air flow, which are the elements of temperature sensation, and the sensitivity to the radiation level and the air flow level. It is an object of the present invention to provide a temperature sensor that can adjust the sensitivity independently to detect a temperature closer to the sensible temperature, and can appropriately control the air conditioner by the detected temperature.

[Means for Solving the Problems] A temperature sensor for an air conditioner according to the present invention includes a plate portion made of a good heat conductor, a heater for heating the plate portion, and a plate portion temperature for detecting the temperature of the plate portion. A heat-sensitive element for detection, a heat insulator that surrounds the periphery by releasing one surface of the plate portion, a film having a high transmittance of radiant energy that covers the released surface through an air layer, the heat insulator and the film. A room temperature detecting heat sensitive element disposed outside the enclosed space, and the plate temperature is higher than the temperature detected by the plate temperature detecting heat sensitive element and the room temperature detecting heat sensitive element. The temperature rise value of the temperature sensitive value of the room temperature detecting thermosensitive element is determined by the temperature difference between this temperature rise value and the reference value that is the temperature rise value of the plate portion when there is no air flow and the temperature of the surrounding object is equal. It is equipped with a correction means for correcting the detected temperature. It

[Operation] The temperature sensor of the air conditioner according to the present invention obtains the temperature rise value of the plate portion from the temperature of the plate portion detected by the plate temperature detecting heat sensitive element and the room temperature detected by the room temperature detecting heat sensitive element, By correcting the detected temperature of the room temperature detecting heat-sensitive element by the temperature difference between this temperature rise value and the reference value that is the temperature rise value of the plate portion when there is no air flow and the temperature of the ambient object is equal to the temperature of the surrounding object, It is possible to detect a temperature close to the sensible temperature that takes into consideration the effects of air temperature, radiant energy and air flow, and by changing the material and thickness of the film, the amount of heat applied to the heater, the thickness of the air layer, etc. By adjusting the sensitivity of the plate to the radiation level and the sensitivity of the plate to the air flow level independently, and adjusting the ratios as accurately as possible to the sensitivity ratio of the sensation, the temperature closer to the sensation temperature can be obtained. Can be detected, and an effect that the air conditioner can be appropriately controlled by the detected temperature can be obtained.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows an embodiment of this invention. In the figure, reference numeral 1 denotes a plate portion of a black body having a good thermal conductivity, and a thermistor 2 and an electric heater 5 are closely fixed to the lower surface of the plate portion 1. Reference numeral 3 is a box-shaped heat insulator whose upper surface is open.
To surround the periphery of the plate portion 1 excluding the upper portion. The open surface above the plate portion 1 is covered with a film 7 having a high transmittance of radiant energy through the air layer. A room temperature detection thermistor 6 is provided outside the space surrounded by the heat insulator 3 and the film 7. A part of the lead wire 6a is fixed to the upper surface of the heat insulator 3 and is held by the lead wire 6a. .

Next, the operation of the temperature sensor thus configured will be described. The heater 5 provided on the surface of the plate portion 1 made of a good thermal conductor
When the plate portion 1 is heated by a certain amount of heat by the above and the temperature of the plate portion 1 is raised, heat is released from the plate portion 1 to the surrounding air and radiant energy is emitted to the surrounding objects. Here, the amount of heat released to the surrounding air increases as the airflow level of the surrounding air increases. This means that the higher the airflow level, the lower the temperature of the plate portion 1. On the other hand, when the airflow level is large, the sensible temperature also decreases, so that the temperature change of the plate portion 1 corresponds to the sensible temperature change. Similarly, when the temperature of surrounding objects is low, the radiation level increases,
Since the emission of radiant energy increases, the temperature of the plate portion 1 decreases. Further, when the radiation level is large, the sensible temperature also decreases, so that the radiant level with respect to the temperature of the surrounding objects is also corresponding to the temperature change of the plate portion and the sensible temperature change. That is, the change in the temperature rise of the plate portion 1 corresponds to the change in the sensible temperature with respect to the air flow level and the radiation level.

Specifically, the sensible temperature is calculated as follows. First, the temperature of the plate portion 1 is detected by the thermistor 2 fixed to the plate portion 1, and the temperature rise value of the plate portion 1 which is the difference from the room temperature detected by the room temperature detection thermistor 6 is calculated. On the other hand, the temperature rise value with respect to the ambient temperature of the plate when there is no air flow and the temperature of the ambient object is equal to the ambient temperature is stored in a microcomputer (not shown) as a reference value. Since the temperature difference between the reference value and the temperature rise value of the plate portion 1 is the temperature decrease of the plate portion 1 due to the influence of the airflow level and the radiation level, this temperature difference is subtracted from the detected temperature of the room temperature detection thermistor 6. If corrected, it becomes possible to detect a temperature close to the sensible temperature.

Further, in the temperature sensor configured as described above, it will be described below that the sensitivity with respect to the radiation level and the sensitivity with respect to the airflow level can be independently adjusted.

The sensitivity to the radiation level can be adjusted by changing the material and film thickness of the film 7. That is,
When the thickness of the film 7 is changed, the radiant energy transmittance changes and the radiant energy emission amount changes, so that the sensitivity to the radiant level changes. For example, if the film 7 is made thicker, the transmittance decreases and the amount of radiant energy emitted decreases, so that the temperature change of the plate portion 1 decreases when the same wall temperature change occurs. Here, if the thermal resistance of the film 7 is made sufficiently smaller than the thermal resistance of the air layer, even if the thickness of the film changes, the change in the amount of energy released by the air flow is so small that it can be ignored. That is, the sensitivity to airflow level does not change.

The sensitivity to the air flow level can be adjusted by changing the amount of heat applied to the heater. That is, when the amount of heat applied to the heater is changed, the amount of heat radiated from the plate portion 1 is changed and the temperature change of the plate portion 1 is also changed with respect to the change of the air flow level, so that the sensitivity to the air flow level is changed. For example, when the amount of heat applied to the heater is increased, the amount of heat released from the plate portion 1 is increased, and the temperature change of the plate portion 1 when the air flow changes is also increased. Here, even if the temperature of the plate portion 1 is changed, if the temperature change of the plate portion 1 is sufficiently small compared to the difference between the temperature of the plate portion 1 and the wall temperature, the change of the radiant energy emission amount is small enough to be ignored. Therefore, the sensitivity to the radiation level does not change. Further, the air around the plate portion 1 is not directly affected by the air flow, and the sensitivity to the air flow level can be adjusted by changing the thickness of the air layer between the film 7 and the plate portion 1. .

In this way, since the ratio of the sensitivity of the plate portion 1 to the radiation level and the sensitivity of the plate portion 1 to the air flow level can be adjusted, it is possible to more accurately match the sensitivity ratio of the sensation to the radiation level and the air flow level.

In addition, since the plate portion 1 is covered with the heat insulating body 3, the size can be reduced and it is convenient when it is attached to the air conditioner. Further, since the one-sided detection is performed, the heat radiation area is small and the amount of heat applied to the heater can be reduced.

[Effects of the Invention] As described above, according to the present invention, the plate portion made of a good conductor of heat, the heater for heating the plate portion, and the plate portion temperature detecting thermal element for detecting the temperature of the plate portion are provided. And a heat insulator surrounding the periphery by releasing one surface of the plate portion, a film having high transmittance of radiant energy that covers the released surface through an air layer, and a space surrounded by the heat insulator and the film. The temperature rise value of the plate part is obtained from the temperature detected by the plate temperature detecting heat element and the temperature detected by the room temperature detecting heat element. A correction means is provided to correct the temperature detected by the temperature-sensitive element for detecting the room temperature by the temperature difference between the temperature rise value and the reference value that is the temperature rise value of the plate portion when the room temperature and the temperature of the surrounding object are equal without air flow. Because of the configuration, the air temperature and radiant energy The temperature closer to the sensible temperature is detected by considering the influence of the air flow and adjusting the ratio of the sensitivity of the plate to the radiation level and the ratio of the sensitivity of the plate to the air flow to the sensitivity ratio of the sensation as accurately as possible. It is possible to obtain the effect that the air conditioner can be controlled appropriately by the detected temperature.

[Brief description of drawings]

FIG. 1 is a sectional view showing a conventional temperature sensor, FIG. 2 is a sectional view showing a temperature sensor of an air conditioner according to an embodiment of the present invention, and FIG. 3 is a perspective view showing a conventional temperature sensor. The drawing is a sectional view taken along the line IV-IV in FIG. 1 ... Plate part, 2 ... Thermistor, 3 ... Insulator, 5 ...
Heater, 6 ... Room temperature detection thermistor, 6a ... Lead wire, 7 ... Film. The same reference numerals in the drawings indicate the same or corresponding parts.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Masanori Hara, 2-14-40 Ofuna, Kamakura-shi, Kanagawa Mitsubishi Electric Corporation Product Research Laboratory (72) Inventor, Sakuo Sugawara 2-14-40, Ofuna, Kamakura-shi, Kanagawa No. Mitsubishi Electric Co., Ltd. Product Research Laboratory (72) Inventor Katsuyuki Aoki 3-18-1, Oshika, Shizuoka-shi, Shizuoka Prefecture Mitsubishi Electric Corporation Shizuoka Factory (72) Kenji Matsuda 3--18, Oka, Shizuoka, Shizuoka Prefecture No. 1 Mitsubishi Electric Co., Ltd. Shizuoka Works (72) Inventor Hidetetsu Ishioka 3-18-1, Oga, Shizuoka City, Shizuoka Prefecture Mitsubishi Electric Co., Ltd. Shizuoka Works (56) References JP-A-53-176 A)

Claims (1)

[Scope of utility model registration request] 1. A plate portion made of a good conductor of heat, a heater for heating the plate portion, a plate portion temperature detecting heat sensitive element for detecting the temperature of the plate portion, and one side of the plate portion being released to surround the plate portion. A heat-insulating body that surrounds the heat-dissipating body, a film having a high radiant energy transmittance that covers the open surface through an air layer, and a room temperature detecting heat-sensitive element that is disposed outside the space surrounded by the heat-insulating body and the film. The temperature rise value of the plate portion is obtained from the detection temperature of the temperature sensing element for detecting the temperature of the plate portion and the temperature sensing element of the temperature sensing element for detecting the room temperature. The temperature sensor of the air conditioner is provided with a correction means for correcting the detected temperature of the room temperature detecting heat-sensitive element based on a temperature difference from a reference value which is a temperature rise value of the plate portion when the temperatures of the two are equal. .