JPS5819644A - Blower speed control device of air conditioner - Google Patents

Abstract

PURPOSE:To prevent cold draft by controlling the amount of air blown out of an indoor unit during heating retrigerant in connection with a relay or the like controlling fuel supply to a heat source for heating a heating agent in a refrigerant heating device. CONSTITUTION:A control circuit consists of a relay or the like 13 for a fam motor which controls the speed of the motor 12 for the blower stepwise or steplessly in connection with a relay or a valve mechanism controlling fuel supply. When controlling heating operation using a refrigerant heater 6, the motor 12 for blower located in the indoor unit A is operated as follows: When the fuel supply control relay 10 supplies fuel, the motor 12 is turned at a preset speed, while when the relay does not supply fuel, the speed of the motor 12 is decreased stepwise or steplessly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air system having a refrigeration cycle equipped with a refrigerant heater that improves heating capacity when the outside temperature is low, and particularly relates to an air system having a refrigeration cycle equipped with a refrigerant heater that improves heating capacity at low outside temperatures. The operation of the supply relay or valve mechanism is detected, and if the relay or valve mechanism is in the state of supplying fuel, the rotation speed of the blower installed in the indoor unit iC is set. Di, and if the relay or valve mechanism does not supply fuel, it controls the rotation speed of the blower installed in the indoor unit to drop below the set rotation speed or to stop, thereby preventing cold draft into the living space. This is intended to prevent this phenomenon and ensure that comfort in the living area does not deteriorate.

Conventionally, in this type of air conditioner, the rotational speed of the blower during refrigerant heating operation has been controlled without regard to the operation of the relay or valve mechanism that controls the fuel supplied to the refrigerant heater. Therefore, even when the blowing temperature is low, the blowing air blows into the living area, causing a cold draft phenomenon and reducing comfort.

The present invention aims to eliminate the drawbacks found in the conventional operation control device for a refrigerant heater of an air conditioner.

Hereinafter, the present invention will be described with reference to the accompanying drawings showing one embodiment thereof.

First, the refrigeration cycle will be explained with reference to FIG.

In the figure, 1 is a compressor, 2 is a four-way switching valve, 3 is an indoor heat exchanger, 4 is a pressure reduction mechanism, 6 is an outdoor heat exchanger, and 6 is a refrigerant that heats the return pipe to the compressor 1. This refrigerant heater 6 is provided with a heat medium 6& such as water, a heat source 6b for heating the heat medium 6a, and a relay for controlling fuel supply to the heat source 6b. Alternatively, a valve mechanism 1° is provided. 7 is the first on-off valve, 8 is the second
These on-off valves control the flow of the refrigeration cycle. 9
is an on-off valve that controls communication between the discharge pipe and the suction pipe of the compressor 1. A well-known refrigeration cycle is constructed by connecting these in an annular manner as shown in the figure.

In the figure, M is the indoor unit, B is the outdoor unit,
C is a freezer/heater unit.

Inside the indoor unit, as shown in FIG. 3, there are installed a blower 11 whose rotational speed is changed in response to a control signal from the relay or valve mechanism 10, and a fan motor 12 that drives the blower 11.

Next, a control circuit for the blower 11 provided in the indoor unit during refrigerant heating operation will be described with reference to FIG. 4.

In the figure, reference numerals 13, 14, and 16 indicate the relay or valve mechanism 1 for controlling the rotation of the blower 11 in stages.
16 is a cooling/heating switching switch, 7 is a mode switching switch 1, and 17 is a mode switching switch for switching the operation of the air conditioner between heat pump operation and heat transfer operation. It is Chi.

In the above configuration, during cooling operation, the refrigerant discharged from the compressor 1 is transferred to the four-way switching valve 2. Outdoor heat exchanger5. Decompression mechanism 4. Indoor heat exchanger 3. Compressor 1 passes through four-way switching valve 2
Configure the refrigeration cycle to return to. Also, during heating operation using a normal heat pump system, refrigerant is discharged from the compressor 1 and the four-way switching valve 2. Indoor heat exchanger 3. Decompression mechanism 4.
Outdoor heat exchanger6. It constitutes a refrigeration cycle that passes through the four-way switching valve 2 and returns to the compressor 1. In these operations, the rotation of the blower 11 is fixed at a certain set value and remains at 6 pages.

Next, when performing refrigerant heating operation using the refrigerant heater 6,
The refrigerant is supplied to the compressor 1. Four-way switching valve2. Indoor heat exchanger 3. Two cycles are constructed: a refrigeration cycle that passes through the first on-off valve 7, enters the refrigerant heater 6, and returns to the compressor 1, and a refrigeration cycle that returns from the compressor 1 to the compressor 1 through the third on-off valve 9. However, in the case of refrigerant heating operation, the second on-off valve 8 is closed, so the refrigerant does not pass through the outdoor heat exchanger 6.

In other words, the refrigerant heating operation using the refrigerant heater 6 is performed in the first
The on-off valve 7 is opened, the second on-off valve 8 is closed, and the third on-off valve 9 is opened to form a refrigeration cycle in which no refrigerant flows into the outdoor heat exchanger 6. The refrigerant discharged from the compressor 1 exchanges heat with indoor air in the indoor heat exchanger 3, and then flows into the refrigerant heater 3, where the heat from the heating source 6b is absorbed into the refrigerant. A refrigeration cycle returning to the compressor 1 is configured.

Here, in controlling the refrigerant heating operation using the refrigerant heater 6 in this way, a thermostat (not shown) provided in the indoor unit or the heating medium 6a sealed in the refrigerant heater 6 is controlled. When the temperature detecting thermostat (not shown) controls the fuel supply relay or valve mechanism 1° to control the operation and stop of the heating source 6b, the refrigerant heater unit C cools the refrigeration cycle. The amount of heat that can be absorbed increases or decreases, and as a result, the amount of heat that can be radiated by the indoor unit also increases or decreases.

However, the amount of air blown from the indoor unit can only take a certain value, so if the amount of heat that can be radiated decreases, the temperature of the blown air will drop, and if it is blown into the living area, it will cause a cold draft and reduce comfort. let

Therefore, when controlling the refrigerant heating operation using the refrigerant heater 6, the relay for fuel supply is controlled by a thermostat installed in the indoor unit or a thermostat installed to detect the temperature of the heat medium 6a. Alternatively, controlling the valve mechanism 1° to operate the heating source 6b;
When the fuel supply relay or valve mechanism 10 is in a state of supplying the fan motor 12 for the blower fan 11 provided in the indoor unit at the same time as controlling the stop, the fan motor 12 is controlled to stop. Operate with the rotation speed at the set value,
When the fuel supply relay or valve mechanism 10 is not supplying fuel, the rotational speed of the fan motor 12 is controlled to be lowered stepwise or steplessly to prevent cold drafts in the living area. It is possible to obtain control of heating operation to prevent and create a comfortable living area.

As is clear from the above embodiments, the blower rotation speed control device for an air conditioner according to the present invention controls the amount and speed of air blown from the indoor unit during refrigerant heating operation to heat the heat medium of the refrigerant heater. By controlling the operating state of the relay or valve mechanism that controls the fuel supply to the heating source, it is possible to prevent low-temperature blown air from being blown into the living area and ensure a comfortable living area. etc., it has excellent effects.

[Brief explanation of the drawing]

FIG. 1 is a refrigeration cycle diagram of an air conditioner equipped with an operation control device for refrigerant heating operation according to an embodiment of the present invention, and FIG.
3 is a front cutaway view of the indoor unit, and FIG. 4 is a schematic diagram of a refrigerant heating operation control circuit in the air conditioner. 1... Compressor, 3... Indoor heat exchanger, 6... Refrigerant heater, 6... Heat medium,
10... Relay for fuel supply control, 11...
...Indoor blower, 12...Fan motor for indoor blower, 13,14.15...Relay for fan motor rotation speed control. Name of agent: Patent attorney Toshio Nakao and one other person
1 Figure 2 Figure 8 Figure 3 Δ /

Claims (1)

[Claims] A refrigeration cycle is provided that is equipped with at least a compressor, an indoor heat exchanger, and a refrigerant heater that heats the refrigerant, and is linked to the operation and stop of a relay or valve mechanism that controls the supply of fuel such as electricity or gas. A blower rotation speed control device for an air conditioner that is equipped with a control circuit that controls the rotation speed of a blower installed in the air conditioner in a stepwise or non-stepwise manner.