JPS6240284Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an improvement of a control device for a fuel supply on-off valve installed in an air conditioner having a refrigeration cycle equipped with a refrigerant heater that improves heating capacity at low outside temperatures. In particular, during refrigerant heating operation, fuel such as electricity, gas, kerosene, etc. is supplied to the heating source that heats the refrigerant through a heating operation relay installed in the air conditioner, and during cooling operation and heating heat pump operation. At times, the fuel supply on-off valve is closed, and during refrigerant heating operation, the fuel supply on-off valve is opened.In addition to automatically stopping fuel supply when refrigerant heating operation is unnecessary, it is also controlled as the season changes. This aims to eliminate the inconvenience of having to go outside and manually open and close the fuel supply on-off valve.

Conventionally, during refrigerant heating operation in this type of air conditioner, the on-off valve that controls the fuel supplied to the heating source of the refrigerant heater was manually opened and closed depending on the settings for the outdoor or indoor side. However, there have been drawbacks such as fuel being supplied even when it is not needed, fuel leakage, and the fuel supply opening/closing valve having to be operated manually depending on the season.

The present invention eliminates the drawbacks found in the conventional control of the on-off valve for supplying fuel to the refrigerant heater of the air conditioner.

The present invention will now be described with reference to the accompanying drawings, which show 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, 5 is an outdoor heat exchanger, 6 is a refrigerant heater that heats the return pipe to the compressor 1, and the refrigerant heater 6 contains water, etc. A heat medium 6a, a heat source 6b for heating the heat medium 6a, and the like are provided, and an on-off valve 10 is provided to control fuel supply to the heat source 6b. 7 is a first on-off valve, and 8 is a second on-off valve, which control the flow of the refrigeration cycle. Reference numeral 9 denotes a third 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, A is an indoor unit, B is an outdoor unit, and C is a refrigerant heater unit.

FIG. 2 shows a control circuit for controlling the on-off valve 10 for supplying fuel to the heating source 6b of the refrigerant heater 6 during refrigerant heating operation, and in the same figure, reference numeral 11 indicates the opening and closing of the on-off valve 10. It is a relay that controls the 1
2 is a cooling/heating switch equipped with a cooling contact 12a and a heating contact 12b; 13 is the heating contact 12b;
It is an operation changeover switch connected to a heat pump and has a heat pump contact 13a and a refrigerant heating contact 13b. A second on-off valve 8 is connected to the heat pump contact 13a, and a first on-off valve 7, a third on-off valve 9, and a relay 11 are connected in parallel to the refrigerant heating contact 13b.

In the above configuration, during cooling operation, the refrigerant discharged from the compressor 1 passes through the four-way switching valve 2, the outdoor heat exchanger 5, the pressure reducing mechanism 4, the indoor heat exchanger 3, and the four-way switching valve 2, and passes through the compressor 1. Configure the refrigeration cycle to return to.

In addition, in heating operation using a normal heat pump system, the refrigerant is discharged from the compressor 1, the four-way switching valve 2,
A refrigeration cycle is configured that returns to the compressor 1 through an indoor heat exchanger 3, a pressure reduction mechanism 4, an outdoor heat exchanger 5, and a four-way switching valve 2.

Next, when performing a refrigerant heating operation using the refrigerant heater 6, the refrigerant passes through the compressor 1, the four-way switching valve 2, the indoor heat exchanger 3, and the first on-off valve 7, and enters the refrigerant heater 6. The refrigeration cycle consists of two cycles: a refrigeration cycle that returns to the compressor 1 through 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 is closed, so the refrigerant does not pass through the outdoor heat exchanger 5. That is, in the refrigerant heating operation using the refrigerant heater 6, the first on-off valve 7 is opened and the second on-off valve 8 is opened.
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 5.

As a result, the refrigerant discharged from the compressor 1 exchanges heat with the indoor air in the indoor heat exchanger 3, and then flows into the refrigerant heater 6, transferring heat from the heating source 6b into the refrigerant. A refrigeration cycle is constructed in which the air is taken in and returned to the compressor 1. The refrigerant heating operation is performed here during heating when the outside temperature is low and the heat pump operation cannot ensure sufficient heating capacity. That is, during cooling operation or heat pump operation, it is unnecessary to supply fuel to the heating source 6b of the refrigerant heater 6, and it is necessary only when the operation is in the refrigerant heating operation state.

Therefore, by opening the on-off valve 10 for supplying fuel to the heat source 6b of the refrigerant heater 6 only during refrigerant heating operation, the supply state from the on-off valve 10 can be changed during cooling operation or heat pump operation. It is possible to eliminate troubles caused by leakage of fuel that is already in use, and the inconvenience of going outside and manually opening and closing the on-off valve 10 every time the temperature outside the room drops.

As is clear from the above embodiments, the heating capacity control device for an air conditioner according to the present invention controls the supply of fuel to the heating source during the refrigerant heating operation by switching between the heat pump operation and the refrigerant installed in the air conditioner during the heating operation. This system is linked to a switch that controls heating operation, and is controlled so that the on-off valve for supplying fuel to the heating source is opened only during refrigerant heating operation, and the on-off valve for supplying fuel to the heating source is automated. It also eliminates the problem of fuel leaking from the on-off valve as much as possible, making seasonal manual operations unnecessary. Furthermore, during refrigerant heating operation, the refrigeration cycle system on-off valve and the fuel system on-off valve are connected to the refrigerant heating contact of the operation changeover switch so that they operate simultaneously, so the refrigeration cycle forms a refrigerant heating cycle during refrigerant heating. However, it has various advantages, such as eliminating the inconvenience caused by the fuel system not operating, and making it easier to confirm failures.

[Brief explanation of the drawing]

FIG. 1 is a refrigeration cycle diagram of an air conditioner equipped with a heating capacity control device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an operation control circuit for an on-off valve that controls fuel supply to a heating source. 1...Compressor, 3...Indoor heat exchanger, 6...
Refrigerant heater, 6b...heat source, 10...fuel supply on-off valve, 11...relay.

Claims (1)

[Scope of utility model registration request] A refrigeration cycle is constructed by connecting a compressor, an indoor heat exchanger, a pressure reduction mechanism, and an outdoor heat exchanger in a ring,
A second on-off valve that prevents refrigerant from flowing into the outdoor heat exchanger by a closing action is provided between the pressure reduction mechanism and the outdoor heat exchanger, and the second on-off valve and the pressure reduction mechanism are provided. A series circuit consisting of a first on-off valve and a refrigerant heater that heats the refrigerant flowing through the indoor heat exchanger to the compressor is connected in parallel with the series circuit consisting of the outdoor heat exchanger and the refrigerant heating. The container is provided with an on-off valve that controls the supply of fuel to the heating source, and a third on-off valve whose both ends are connected to the discharge pipe and suction pipe of the compressor, and further controls heating operation by the heat pump and the refrigerant. An operation changeover switch is provided which is equipped with a heat pump terminal and a refrigerant heating terminal for switching heating operation by the operation of the heater, and the second on-off valve is connected to the heat pump terminal of the operation changeover switch, and the first shutoff valve is connected to the refrigerant heating terminal. A heating capacity control device for an air conditioner, which includes an on-off valve, a third on-off valve, and a relay for controlling opening and closing of the on-off valve for fuel supply control, which are connected in parallel.