JPS6027323Y2 - air conditioner - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an air conditioner equipped with a heating device that operates according to the outside air temperature during heating.

Conventionally, this type of air conditioner has been provided with a temperature detector that detects the temperature of the refrigerant flowing out of the heating device as a means for preventing the refrigerant from being overheated by the heating device.

This temperature detector detects the temperature of the refrigerant flowing out of the heating device, and when this detected temperature reaches a set temperature that allows overheating of the refrigerant or lubricating oil in the refrigerant compressor, the amount of heat generated by the heating device is reduced, and the refrigerant or This is to prevent overheating of lubricating oil, etc.

However, in this type of device, the allowable superheating temperature of the refrigerant is set to a constant value regardless of the temperature of the refrigerant flowing into the heating device, so even if the refrigerant flowing out of the heating device is below the above-mentioned superheating allowable setting temperature. Not only does this have the problem of overheating depending on the temperature of the inflowing refrigerant, but it also has the drawback that the state of refrigerant evaporation by the heating device cannot be monitored.

The present invention was developed in view of the above points, and is configured to detect the temperature difference between the inflow and outflow refrigerant of the heating device that operates during heating, and to maintain this temperature difference below the set temperature difference. This solves the above-mentioned conventional problems.

Embodiments of the present invention will be described below based on the drawings.

In the figure, 1 is the refrigerant compressor, and 2 is the discharge side of the refrigerant compressor 1.
3 is an indoor heat exchanger connected to the C contact of the four-way valve 2, 4 is a blower that blows air to the indoor heat exchanger 3, and 5 is an indoor heat exchanger. An expansion mechanism such as a capillary tube connected to the heat exchanger 3, 6 a one-way valve connected in parallel to the expansion mechanism 5 and bypassing the expansion mechanism 5 during heating, and 7 connected to the expansion mechanism 5 and the one-way valve 6. an outdoor heat exchanger; 8 is a blower that supplies outdoor air to the outdoor heat exchanger 7; 9 is an evaporator interposed between the outdoor heat exchanger 7 and the d contact point of the four-way valve 2; 10 is an evaporator; A temperature detector 11 is installed between the outdoor heat exchanger 7 and the evaporator 9, that is, on the inlet side of the evaporator 9 during heating. A temperature sensor installed on the outflow side; 12, a combustor that heats the evaporator 9; 13, a temperature sensor 10; 13 detects the inflow of refrigerant into the evaporator 9 when the combustor 12 is heated in response to a signal from the 11; - A control circuit serving as a control means for detecting the temperature difference between the refrigerant and controlling the calorific value of the combustor 12 to correct it to below the set temperature difference of the refrigerant.

Next, the action will be explained.

Note that during the cooling operation, the refrigerant circulates as shown by the dotted arrow in the figure, which is the same as in the conventional case, so the explanation will be omitted, and the heating operation will be explained.

If the outside air temperature is above a predetermined temperature during heating operation, the heat pump function is fully utilized and the combustion machine 12 is stopped.
The effect is the same as in the conventional case, as in the case of cooling operation, and the direction of flow of the refrigerant is shown by a solid arrow.

On the other hand, if the outside air temperature difference during heating operation is less than a predetermined value, the heat pump function will be insufficient and the combustor 12 will operate.

In this case, in the transient region until the refrigerant flow rate that occurs at startup reaches a steady flow rate, the temperature sensor 10.1
1, the control means 13 constantly detects the temperature difference of the refrigerant and adjusts the calorific value of the combustor 12 so that the temperature difference is below the set temperature difference, so the refrigerant does not become overheated, and of course, the refrigerant compression The lubricating oil, etc. of machine 1 will not become overheated.

Furthermore, even if the heating load changes during regular operation, the temperature of the refrigerant flowing out of the indoor heat exchanger 3 will change depending on the load, and the temperature difference will also change. 12 can adjust the amount of heat generated.

This prevents the refrigerant from becoming overheated.

Of course, the same applies to lubricating oil and the like.

Incidentally, in the above embodiment, a combustion machine was used as the heating device, but
There is no need to be limited to this, and a heat source such as an electric heater may be used.

As explained above, according to the present invention, the temperature difference between the inflow and outflow of the refrigerant of the heating device, which operates according to the outside air temperature during heating, is detected and the temperature difference is adjusted to be below the set temperature difference. Even if the heating load changes, such as during startup or rain, the refrigerant will not become overheated.

This also prevents the lubricating oil in the refrigerant compressor from becoming overheated.

[Brief explanation of the drawing]

The figure is a schematic configuration diagram of an air conditioner that is an embodiment of the present invention. 1...Refrigerant compressor, 3...Indoor heat exchanger, 7...Outdoor heat exchanger, 9...
Evaporator, 10.11...Temperature detector, 12...
...Combustor, 13...Control circuit.

Claims (1)

[Scope of utility model registration request] In an air conditioner that air-conditions a room by evaporating and condensing the refrigerant, the air conditioner includes an indoor/outside heat exchanger and a heating device that operates according to the outside air temperature during heating to evaporate a refrigerant. An air conditioner comprising a detection means for detecting a temperature difference between refrigerants at an outlet, and a control means for controlling a heating device to maintain the detected temperature difference below a set temperature difference.