JPS5820858Y2 - Air conditioning equipment - Google Patents

Description

[Detailed description of the invention] This invention uses heat pump operation in which the outdoor heat exchanger acts as an evaporator when the outside temperature is high, and the refrigerant heater acts as an evaporator when the outside temperature is low. The purpose of this system is to eliminate the discrepancy in the amount of refrigerant charged when operating a heat pump and using a refrigerant heater to obtain sufficient heating capacity.

A conventional example is shown in FIG.

During heating or when operating the heat pump when the outside temperature is high, compressor 1'
The compressed high-pressure gas refrigerant flows into the indoor heat exchanger 3' through the first four-way valve 2', where it condenses and releases heat, is reduced in pressure by the pressure reducing mechanism 4', and is transferred to the outdoor heat by the second four-way valve 5'. It flows into the exchanger 7', is gasified and evaporated, and then passes through the second four-way valve 5' again.
As a result, the refrigerant passes through the refrigerant heater 6' whose heat input is turned off, and returns to the compressor 1' through the first four-way valve 2'.

When the outside temperature is low, the high-pressure gas refrigerant compressed by the compressor 1' flows into the indoor heat exchanger 3' through the first four-way valve 2', condenses and releases heat, is depressurized by the pressure reducing mechanism 4', and is then transferred to the indoor heat exchanger 3'. The refrigerant flows into the refrigerant heater 6' through the four-way valve 5', is heated there, undergoes gasification and evaporation, and returns to the compressor 1' through the first four-way valve 2'.

However, when the heat pump operation is changed to the operation using the refrigerant heater 6' using the second four-way valve 5', the refrigerant flowing through the outdoor heat exchanger 7' is transferred to the second four-way valve 5'. In the cycle using the refrigerant heater 6', the amount of refrigerant charged is considerably reduced compared to when the heat pump is operated.

Therefore, a decrease in heating capacity was observed.

The present invention solves the above problems and eliminates the discrepancy in the amount of refrigerant charged when operating the heat pump and when using the refrigerant heater. This makes it possible to obtain sufficient heating regardless of the outside temperature.

An embodiment of the present invention will be described below with reference to FIG. 2 of the accompanying drawings.

1 is a compressor, 2 is a first four-way valve, 3 is an indoor heat exchanger,
Acts as a condenser during heating and an evaporator during cooling.

4 is a pressure reduction mechanism; 5 is a second four-way valve, which sequentially connects the compressor 1, first four-way valve 2, indoor heat exchanger 3, pressure reduction mechanism 4, and a refrigerant evaporator in series when the outside temperature drops during heating; A refrigerant heater 6 that acts as a heater and an ejector 8 are installed between the decompression mechanism 4 of the refrigerant main circuit connected to the refrigerant and the cold use 6,
Four-way heat exchanger 6 and outdoor heat exchanger 7 before evaporation of refrigerant during heating
There are two valves to choose from.

The operation of the present invention is shown in the above configuration.

The solid line in the figure shows the refrigerant flow during heat pump operation during heating.
A broken line indicates when a refrigerant heater is used, and a dashed line indicates when cooling.

During heating, when the outside temperature is relatively high, the refrigerant compressed by the compressor 1 flows into the indoor heat exchanger 3 through the first four-way valve 2, condenses and liquefies, and is depressurized by the pressure reducing mechanism 4, and then passed through the second four-way valve. The refrigerant flows into the outdoor heat exchanger 7 via the air heat source 5, is gasified and evaporated by the air heat source, passes through the refrigerant heater 6 whose heat input is turned off, and returns to the compressor 1 through the first four-way valve 2.

During heating, when the outside temperature is low and sufficient heating capacity cannot be obtained by heat pump operation, the refrigerant compressed by the compressor 1 flows into the indoor heat exchanger 3 through the first four-way valve 2, condenses and liquefies, and is activated by the pressure reducing mechanism. 4, the refrigerant flows into the refrigerant heater 6 through the second four-way valve 5, and is gasified and evaporated.

When the gasified and evaporated refrigerant passes through the ejector 8, it sucks the refrigerant accumulated in the outdoor heat exchanger 7 during heat pump operation by the ejector effect and returns to the compressor 1 through the first four-way valve 2.

Next, during cooling, the refrigerant compressed by the compressor 1 flows into the outdoor heat exchanger 7 in a gas state through the first four-way valve 2, condenses, releases heat, and liquefies, and then passes through the second four-way valve 5 to the pressure reducing mechanism 4. It is depressurized, flows into the indoor heat exchanger 3, is gasified and evaporated, and returns to the compressor 1 through the first four-way valve 2.

As explained above, the present invention is designed to connect a compressor, a first four-way valve, an indoor heat exchanger, a pressure reducing mechanism, a refrigerant heater, and an ejector to a refrigerant main circuit in which the pressure reducing mechanism and the refrigerant heater are connected in series. By providing an outdoor heat exchanger via a second four-way valve, and connecting the low pressure part of the ejector and the vicinity of the outdoor heat exchanger with a suction pipe, the refrigerant can be used depending on the outside temperature during heating. Sufficient heating capacity can be obtained regardless of the outside temperature by selecting whether gasification and evaporation is performed by heat pump operation using an outdoor heat exchanger or by a refrigerant heater.Using a refrigerant heater from the time of heat pump operation in an air-conditioning system where sufficient heating capacity can be obtained regardless of outside temperature. When changing to a cycle, the refrigerant present in the outdoor heat exchanger is sucked into the refrigerant main circuit by the ejector action, thereby eliminating the difference in refrigerant filling amount between conventional heat pump operation and when using a refrigerant heater. , sufficient heating capacity can be obtained when using a refrigerant heater.

[Brief explanation of drawings]

FIG. 1 is a refrigerant circuit diagram of a conventional heating and cooling device, and FIG. 2 is a refrigerant circuit diagram of a heating and cooling device according to an embodiment of the present invention.

Claims (1)

[Claims for Utility Model Registration] Compressor, first four-way valve, indoor heat exchanger, pressure reduction mechanism. A refrigerant main circuit in which a refrigerant heater and an ejector are sequentially connected in series is provided with an outdoor heat exchanger via a second four-way valve between the pressure reducing mechanism and the refrigerant heater, and an outdoor heat exchanger is provided between the low pressure section of the ejector and the refrigerant heater. The vicinity of the outdoor heat exchanger is connected with a suction pipe,
A heating and cooling system that selectively evaporates refrigerant using an outdoor heat exchanger and a refrigerant heater depending on the outside temperature during heating.