JPH02122143A - Temperature control device - Google Patents

Abstract

PURPOSE:To make it possible to maintain detection accuracy about temperature distribution voltage by installing a suction air temperature detection device for a suction air temperature thermistor and a differential amplification device which outputs the temperature distribution voltage depicting an indoor temperature distribution state. CONSTITUTION:A suction temperature detection unit 14 for a temperature control device detects room temperature with a suction temperature temperature thermistor 12 from a suction air temperature detection means 11. The change in the suction air temperature is converted into the change in a resistance value of the suction temperature thermistor 12. An output means of an amplifier 31 varies based on a potential generated by a partial pressure of resistors 35 and 36, and processes the non-linear characteristic of the thermistor so that the voltage may be turned in linear mode. An amplifier 34 input a voltage V3 which is output from the amplifier 31 and amplified from the amplidaction degree of the resistance value ratio between the resistors 35 and 36 into a differential amplification device 22. The differential amplification device 22 which receives the voltages V1 and V3 output from a radiation temperature detection device 13 and a suction air temperature detection device 14 respectively, performs arithmetic operation and outputs a temperature distribution voltage 29 which depicts an indoor temperature distribution state.

Description

[Detailed description of the invention] Industrial applications The present invention is an air conditioner, especially an indoor temperature control device Page 2 It is related to.

Prior Art The conventional technology will be explained with reference to FIGS. 2, 3, and 4. In FIG. 2, reference numeral 1 denotes an indoor unit of a ceiling-embedded air conditioner, and the lower surface of the indoor unit 1 is opened on the same plane as the ceiling 2. Room 3 has ceiling 2. It consists of side walls 4.5 and a floor 6. Further, 7 is a suction port of the indoor unit 1. In FIG. 3, 7 is a blower casing made of a heat insulating material. Reference numeral 8 denotes a radiant temperature detecting section, which is composed of a downwardly opened concave mirror 9 made of aluminum and a radiant temperature thermistor 1o provided near its focal point. Reference numeral 11 denotes a suction air temperature detection section, which is composed of a suction air temperature thermistor 12. FIG. 4 shows a temperature control device comprising a radiation temperature detection device 13 and a suction air temperature detection device 14. The radiant temperature detection device 13 is connected to the radiant temperature thermistor 1o, the resistor 15, and the non-inverting input part of the amplifier 16, one side of the radiant temperature thermistor 10 is grounded, and the resistor 17 and the resistor 17 are connected to each other. 18 and the inverting input of the amplifier 16 are connected. One end of the resistor 17 is grounded.

The outputs of resistor 15, resistor 18 and amplifier 16 are connected to a non-inverting input of amplifier 19.

The inverting input section of the amplifier 19 is connected to a resistor 20 and a resistor 21, and one of the resistors 20 is grounded. Also, one side of the resistor 21 is connected to the output of the amplifier 19,
Its output is input to a differential amplifier 22. Next, in the suction air temperature detection device 14, the suction air temperature thermistor 12, a resistor 23, and an inverting input part of an amplifier 24 are connected through a resistor 25; e, and one side of the suction air temperature thermistor 12 is grounded and the resistance 23
One side is connected to the power supply, and the other is connected to the resistor 26 and resistor 2.
7 and the non-inverting input of the amplifier 24 are connected.

One side of the resistor 17 is grounded, and one side of the resistor 270 is connected to the power supply. The inverting input section and the output section of the amplifier 24 are connected via a resistor 28, and the output section thereof is input to the differential amplifier 22. The differential amplifier device 22
outputs a temperature distribution voltage 29 that can detect the temperature distribution state of the chamber 3 based on the output voltage difference between the amplifier 19 and the amplifier 24.

The operation of the temperature control device configured as described above will be explained below.

The radiation temperature is detected by the radiation thermistor 10 using the concave mirror 9 from the radiation detection section 8 which is to detect the temperature distribution voltage 29 of the chamber 3 . A change in the radiant temperature is converted into a change in the resistance value of the radiant temperature thermistor 10, and when the resistance value of the radiant temperature thermistor 10 changes, the resistance value of the radiant temperature thermistor 10 changes.
5, the potential at the non-inverting input portion of the amplifier 16 increases as the resistance value of the radiant temperature thermistor 11 increases, and decreases as the resistance value decreases.

Therefore, the output section of the amplifier 16 changes centering on the potential generated by the voltage division between the resistor 18 and the resistor 17, processing the nonlinear characteristics of the thermistor into linear characteristics, and changing the voltage linearly. Further, the amplifier 19 transfers the voltage output from the amplifier 16 to the resistor 20 and the resistor 2.
An output voltage (1) amplified by a 5-page amplification factor with a resistance value ratio of 1 is inputted to the differential amplifier 22.

Next, the suction air temperature detection device 14 will be explained. The room temperature is detected by the suction air temperature thermistor 12 from the suction air temperature detection section 11 which is to detect the temperature distribution voltage 29 of the chamber 3 . A change in room temperature is converted into a change in the resistance value of the suction air temperature thermistor 12. When the resistance value of the suction air temperature thermistor 12 changes, due to the partial pressure with the resistor 28, the amplifier 2
When the resistance value of the suction air temperature thermistor 12 increases, the potential at the inverting input section 4 increases, and when it decreases, the potential decreases. Therefore, the output section of the amplifier 24 is amplified by the amplification degree of the resistance value ratio of the resistor 25 and the resistor 2B around the potential generated by the voltage division between the resistor 18 and the resistor 17. 2 is input to the differential amplifier 22.

Each output voltage V1. of the radiation temperature detection device 13 and the suction air temperature detection device 14. The differential amplifier 22 inputs V2 and performs the calculation of page 6 (2), performs (1) and outputs a temperature distribution voltage 29.

Problems to be Solved by the Invention However, in such a configuration, the radiant temperature detection device 13
Since the detection circuit configurations of the radiant temperature thermistor 10 and the suction air temperature thermistor 12 are different, there are variations in the radiant temperature thermistor 10, the intake air temperature thermistor 12, and each component, and temperature variations in the circuit due to the temperature of the chamber 3 used, etc. Due to these factors, it was not possible to ensure the detection accuracy of the temperature distribution voltage 29.

Means for Solving the Problems The temperature control device of the present invention includes a radiant temperature thermistor that converts radiant heat in a room into a change in resistance value, and a radiant temperature thermistor that detects the change in resistance value of the radiant temperature thermistor as the radiant temperature of the room. a temperature detection device, a suction air temperature thermistor that converts room temperature into a change in resistance value, a suction air temperature detection device that detects a change in resistance value of the suction air temperature thermistor as a change in room temperature, and the radiation temperature detection device. It consists of a differential amplifier that outputs a temperature distribution voltage indicating the temperature distribution state of the room based on the output voltage difference of the suction air temperature detection device described on the previous page 7.

Operation The present invention has the above-described configuration to make the circuit configuration of the radiant temperature detection device and the suction air temperature detection device the same, so that the temperature distribution state of the room indicated by the difference between the radiant temperature and the suction air temperature can be detected by the circuit components. Accurate detection is possible without being affected by variations in temperature and circuit temperature variations.

Embodiment A temperature control device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a circuit diagram of a temperature control device according to an embodiment of the present invention. In FIG. 1, circuit configurations that are the same as the conventional configuration shown in FIG. 4 are designated by the same reference numerals and detailed explanations will be omitted. FIG. 1 shows a temperature control device according to the present invention, which is composed of a radiation temperature detection device 13 and a suction air temperature detection device 14. The suction air temperature detection device 14 is connected to the suction air temperature thermistor 12, a resistor 80, and a non-inverting input part of an amplifier 81, one side of the suction air temperature thermistor 12 is grounded, and a resistor 32 and a resistor 33. and the inverting input section of the amplifier 31 are connected. One end of the resistor 32 is grounded. The outputs of resistor 30, resistor 33, and amplifier 31 are connected to a non-inverting input of amplifier 34.

The inverting input of amplifier 34 is connected to resistor 35 and resistor 36 . One end of the resistor 35 is grounded. Further, one end of the resistor 36 is connected to the output of the amplifier 34, and the output thereof is input to the differential amplifier 22.

The operation of the temperature detection device configured as described above will be explained below with reference to FIG. Note that the operation of the radiation temperature detection device 13 is the same as the conventional one, so a detailed explanation will be omitted. The suction temperature detection device 14 detects the room temperature using the suction air temperature thermistor 12 from the suction air temperature detection section 11 which is to detect the temperature distribution voltage 29 of the chamber 3 . A change in the suction air temperature is converted into a change in the resistance value of the suction temperature thermistor 12. When the resistance value of the suction air temperature thermistor 12 changes, due to the partial pressure with the resistor 30, the amplifier 81
When the resistance value of the suction air temperature thermistor 12 increases, the potential at the non-inverting input portion of the inverter increases, and when it decreases, the potential decreases. Therefore, the output section of the amplifier 81 changes the potential generated by the voltage division between the resistor 35 and the resistor 36, processing the nonlinear characteristics of the thermistor into linear characteristics, and changing the voltage linearly. Further, the amplifier 34 amplifies the voltage output from the amplifier 31 by the amplification degree of the resistance value ratio of the resistor 85 and the resistor 36, and the output voltage (1)8 is inputted to the differential amplifier device 22. The differential amplifier 22, which receives the output voltages Vl and V3 of the radiant temperature detection device 13 and the suction air temperature detection device 14, calculates V1-V3 and calculates the temperature distribution indicating the temperature distribution state of the room. Outputs voltage 29.

As described above, according to this embodiment, the circuit configurations of the radiant temperature detecting device and the suction air temperature detecting device are the same on page 10, so that the temperature distribution state of the room indicated by the difference between the radiant temperature and the room temperature is shown. Temperature distribution voltage can be detected accurately without being affected by variations in each circuit component of the radiant temperature detection device and suction air temperature device, and temperature variations in the circuit. Detection accuracy is improved with an inexpensive circuit configuration. can be realized.

Effects of the Invention As described above, the temperature control device of the present invention includes a radiant temperature thermistor that converts radiant heat in a room into a change in resistance value, and a radiant temperature thermistor that detects a change in resistance value of the radiant temperature thermistor as the radiant temperature in the room. a detection device, a suction air temperature thermistor that converts room temperature into a change in resistance value, a suction air temperature detection device that detects a change in resistance value of the suction air temperature thermistor as a change in room temperature, the radiation temperature detection device, and the It consists of a differential amplifier that outputs a temperature distribution voltage indicating the temperature distribution state of the room based on the output voltage difference of the suction air temperature detection device, and the circuit configuration of the radiant temperature detection device and the suction air temperature detection device is shown on page 11 of the same page. Because of this structure, the temperature distribution voltage, which indicates the temperature distribution state of the room as indicated by the difference between the radiant temperature and the room temperature, is detected by the radiant temperature detection device and the variation in each circuit component of the suction air temperature device.
The practical effects are extremely large, such as being able to accurately detect the temperature distribution state of the room without being affected by temperature variations in the circuit, and improving detection accuracy with an inexpensive circuit configuration. be.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of a temperature control device according to an embodiment of the present invention, Fig. 2 is an indoor unit installation diagram, Fig. 3 is a sensor installation diagram, and Fig. 4 is a conventional temperature control device. FIG. 10...Radiation temperature sensor 12...Suction air temperature sensor 18...Radiation temperature detection device, 14...
- Suction air temperature detection device, 22... Differential amplifier, 29... Temperature distribution voltage.

Claims (1)

[Claims] A radiant temperature thermistor that converts the radiant heat of the room into a change in resistance value, a radiant temperature detection device that detects the change in the resistance value of the radiant temperature thermistor as the radiant temperature of the room, and a suction air that converts room temperature into a change in resistance value. A temperature thermistor, a suction air temperature detection device that detects a change in the resistance value of the suction air temperature thermistor as a change in room temperature, and a temperature distribution state of the room based on the output voltage difference between the radiant temperature detection device and the suction air temperature detection device. 1. A temperature control device comprising: a differential amplifier device that outputs a temperature distribution voltage showing a temperature distribution voltage, wherein the radiation temperature detection device and the suction air temperature detection device have the same circuit configuration.