JPS6269034A - Temperature regulator - Google Patents

Abstract

PURPOSE:To make it possible to control rigorously with a simple construction and to prevent the back-flow of liquid to a compressor by providing a mechanism which regulates voltage applied to a heater which is installed to the heat-sensing cylinder of an expansion valve. CONSTITUTION:An expansion valve 4 to regulate the flow rate of a coolant, uniform pressure pipe 5 which detects the outlet pressure of a heat exchanger and transmits it to the expansion valve, and a heat-sensing cylinder 6 which detects the coolant temperature in the piping or the temperature of a micro-heater 7 and determines the opening circle of the expansion valve. On the basis of the temperature detected by an thermometer 10 installed in a room, the voltage passing through an Triac 8 by a controller 11 is regulated. Since a micro-heater 7 changes its heat generation according to the intensity of the voltage, the amount of heat generation is detected by a heat-sensing cylinder 6 to control the expansion valve 4 and also adjusts the amount of coolant flowing into a cooling coil 2. Further, since a uniform pressure pipe 5 and a heat-sensing cylinder 6 are provided, it is possible to prevent the back-flow of liquid to a compressor. Further, a temperature sensor 10, controller 11 and Triac 8 can be commonly used with a plurality of coils by using a resistance 9 for voltage minute adjustment.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a control method for an air conditioner that adjusts the temperature and humidity of air, and in particular, uses a cooling coil to maintain strict temperature control of approximately ±0.5°C. The present invention relates to a temperature control device suitable for the required air conditioner.

[Background of the invention]

Conventionally, in this type of temperature control, a motorized valve is installed in the cooling coil, and the opening degree of this motorized valve is controlled to adjust the room temperature, as disclosed in Japanese Patent Application Laid-Open No. 57-21740 and Japanese Patent Application Laid-Open No. 5
It is known from the publication No. 8-182062.

Although strict temperature control is possible with such control, there are problems in that the structure of the electric valve and regulator is complicated and the price is high.

Also, one using a thermoelectric expansion valve was published in Japanese Patent Application Laid-Open No. 58-182.
It is known from the publication No. 062. In this case, refrigerant control to prevent liquid backflow to the compressor becomes complicated.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a temperature control device that solves such problems and realizes temperature control of an air conditioner, which requires strict temperature control, with a simple configuration.

[Summary of the invention]

In order to achieve the above object, the present invention has the following improvements.

(1) An expansion valve with a simple structure is used to replace the power of the electric valve conventionally used for room temperature control.

(2) In order to control the expansion valve, a heater is attached to the temperature sensing tube of the expansion valve, and a mechanism is provided to adjust the voltage applied to the heater. For example, when the room temperature increases, the voltage output increases, and accordingly, the temperature of the heater increases, causing the expansion valve to open. Also, when the room temperature decreases, the voltage decreases, and accordingly, the temperature of the heater decreases and the expansion valve closes. Additionally, this expansion valve is equipped with a temperature-sensitive tube, making it easy to prevent liquid back-up.

(3) In order to share the voltage adjustment of the above heater with multiple coils, the heater for each coil is equipped with a paper alignment resistor.
Corrects variations between coils.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In the figure, 1 indicates a heat exchanger main body, 2 a cooling coil, and 3 a pipe through which a refrigerant flows. Also.

In the control device, 4 is an expansion valve that adjusts the refrigerant flow plate.

5 is a pressure equalizing pipe that detects the heat exchanger outlet pressure and transmits it to the expansion valve; 6 is a temperature sensing cylinder that detects the temperature of the refrigerant in the pipe or the temperature of the micro heater 7 and determines the opening degree of the expansion valve. ,
8 is a triac that controls the voltage applied to the microheater; 9 is a resistor for fine adjustment of the voltage; 10 is a sensor that detects the indoor temperature; 11 is the output of 10 that controls the timing of the gate voltage applied to the triac. The regulating controller 12 indicates a transformer regulating the maximum voltage applied to the microheater.

Next, the operation of this device will be explained. Based on the temperature detected by a thermometer 10 installed indoors, a controller 11 adjusts the voltage passing through the triac 8. Since the amount of heat generated by the microheater 7 changes depending on the magnitude of this voltage, this is detected by the temperature sensing cylinder 6, and the expansion valve 4 is controlled to adjust the amount of refrigerant flowing into the cooling coil 2.

For example, when the room temperature is higher than a set value, the controller 11 controls the triac 8 so that the portion to be cut is reduced. Therefore, the amount of heat generated by the micro heater 7 becomes large, and the opening degree of the expansion valve 4 becomes large.
Since the amount of inflowing refrigerant increases, the indoor cooling effect increases.

On the other hand, when the indoor temperature is lower than the set value, the controller 11 controls so that the area to be cut by the tractor 8 is increased. Therefore.

The amount of heat generated by the micro heater 7 becomes small, the opening degree of the expansion valve 4 becomes small, and the amount of inflowing refrigerant becomes small, so that the indoor cooling effect becomes small.

Furthermore, since it has a pressure equalizing pipe 5 and a temperature sensor @6, liquid backflow to the compressor can be prevented.

Further, by using the voltage fine adjustment resistor 1o, the temperature sensor 10. Controller 11. Also, the triac 8 can be shared by a plurality of coils.

〔Effect of the invention〕

As described above, according to the present invention, strict control can be achieved with a simpler configuration than devices using conventional electric valves, and
Liquid backflow to the compressor can also be easily prevented.

Furthermore, by providing an electric fine adjustment mechanism, it is possible to control the number of watts of the heater with one set of temperature sensor, controller, and triac.

[Brief explanation of drawings]

The figure is a system diagram of an embodiment of the present invention. 1... Heat exchanger body, 2... Cooling coil, 3...
Refrigerant piping, 4... expansion valve, 5... pressure equalization pipe, 6...
Temperature sensing tube, 7... Micro heater, 8... Triac, 9... Resistor for voltage machine AM, 10... Temperature sensor, 11... Controller, 12... Transformer, 13
...Compressor.

Claims (1)

[Claims] 1. In an air conditioner having a cooling coil, an expansion valve is disposed at the inlet of the cooling coil, a temperature sensing tube is placed at the outlet of the cooling coil, and a temperature sensing tube heating device is attached to the temperature sensing tube. A temperature control device characterized in that a hot tube heating device controls an expansion valve to adjust the amount of refrigerant or cold water circulated into a cooling coil. 2. The temperature control device according to claim 1, characterized in that a heater is used as the temperature-sensitive tube heating device, and a mechanism is provided for adjusting the amount of heating by adjusting the voltage applied to the heater. Temperature control device. 3. A temperature control device according to claim 1 or 2, characterized in that each of the plurality of heaters is provided with a mechanism for finely adjusting the heater temperature.