JPS6225648Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an air-conditioning and heating system in which a heating cycle includes a refrigerant heater serving as a heat supply source in the cooling cycle.

This type of air conditioning equipment mentioned above consists of a compressor, outdoor heat exchanger (cooling condenser), capillary reach tube,
Many systems incorporate a refrigerant heater, which serves as a heat supply source during heating operation, into a cooling cycle consisting of an indoor heat exchanger (cooling evaporator). A refrigerant heater is usually provided between an indoor heat exchanger and a compressor, and low-temperature refrigerant gas flows therethrough during cooling operation. Although the refrigerant heater does not perform an active function during cooling operation, it is not a major impediment to cooling operation, so the circulation of refrigerant during cooling operation is permitted. However, making the refrigerant conductive when the refrigerant heater is inactive often causes trouble with the refrigerant heater. That is, due to the conduction of the refrigerant, dew condensation occurs on the refrigerant heater in the idle state, leading to corrosion of the refrigerant heater.

An object of the present invention is to provide a heating and cooling device that can prevent dew condensation on a refrigerant heater and prevent its corrosion.

Next, the configuration of the present invention will be specifically explained based on an embodiment shown in the drawings.

The air conditioning system shown in the drawing as an application example of the present invention includes a compressor 1, an outdoor heat exchanger 2 (cooling condenser), a capillary reach tube 3, and an indoor heat exchanger 4.
A cooling (refrigeration) cycle revolves around a cooling evaporator, and a heating cycle revolves around a refrigerant heater 5, a compressor 1, and an indoor heat exchanger 4. Although the heating cycle is built into the cooling cycle, the outdoor heat exchanger 2 and the cooling capillary reach tube 3 are separated from the cooling cycle and constitute their own cycle. That is,
The cooling refrigerant circuit includes a heating refrigerant circuit 6 that spans the compressor 1 and a refrigerant heating circuit 7 that bridges the inlet and outlet sides of the indoor heat exchanger 4. During heating operation, the outdoor heat exchanger The refrigerant is prevented from flowing into the capillary reach tube 2 and the capillary reach tube 3. The heating refrigerant circuit 6 includes a solenoid valve 8 that closes this circuit during cooling operation, and the refrigerant heating circuit 7 includes a refrigerant heater 5 that heats the refrigerant in series with a valve element 9 such as a check valve or a solenoid valve. Accumulator 10
is incorporated. The communication part of the heating refrigerant circuit 6 with the cooling refrigerant circuit on the indoor heat exchanger 4 side is set closer to the indoor heat exchanger 4 than the communication part of the refrigerant heating circuit 7 with respect to the refrigerant circuit, so that the communication between both A resistance element (such as a capillary or a throttle valve) 11 is inserted into the refrigerant circuit between the parts, and an accumulator 12 is disposed behind the resistance element 11, that is, near the suction port of the compressor 1. Therefore, in this air-conditioning system, during cooling operation, by operating the valve, the compressor 1 is connected to the outdoor heat exchanger 2, the capillary reach tube 3, and the indoor heat exchanger 4.
The refrigerant can be circulated around the compressor 1 through the accumulator 12 and back to the compressor 1. During heating operation, by operating a valve, the refrigerant is circulated from the compressor 1 through the heating refrigerant circuit 6 to the indoor heat exchanger 4 and the refrigerant heater. 5. Refrigerant can be circulated around the accumulator 10 and back from the accumulator 12 to the compressor 1. Note that during heating operation, a part of the refrigerant flowing through the heating refrigerant circuit 6 passes through the resistance element 11 and is returned to the compressor 1 from the refrigerant circuit. That is, the outdoor heat exchanger 2, which is a component for cooling, and the capillary reach tube 3, which has a large resistance, have a short path for the refrigerant that transports heat for heating, and which radiate heat.
Since the refrigerant does not pass through the refrigerant heater 5, the heat from the refrigerant heater 5 can be efficiently transferred to the indoor heat exchanger 4, and since there is no conduction of refrigerant to the refrigerant heater 5 during cooling operation, the refrigerant heater 5 There is little chance of corrosion due to condensation. In addition, since the refrigerant conduction direction of the indoor heat exchanger 4 is opposite during the cooling operation and during the heating operation, the communication pipe 13 related to the indoor heat exchanger 4,
The phase of the refrigerant flowing through the refrigerant 14 is the same, and as a result, the two communication pipes 13 and 14 related to the indoor heat exchanger 4 can be configured separately for use in the liquid phase and for use in the gas phase. That is, during cooling operation, refrigerant liquid passes through the communication pipe 13 on the inlet side of the indoor heat exchanger 4, and refrigerant gas passes through the communication pipe 14 on the outlet side, but also during heating operation, each communication pipe 13,
14, refrigerant having the same phase as that during cooling operation flows in the opposite direction. Therefore, the communication pipe 13 through which only liquid refrigerant flows can be constructed of a thinner pipe that is easier to pipe and process than one through which refrigerant gas passes. Especially during heating operation, the refrigerant may not be completely gasified in the refrigerant heater 5, and the refrigerant in a gas-liquid state may be sucked into the compressor 1, but this increases the load on the compressor 1. This factor can be eliminated by the liquid absorption action of the accumulators 10 and 12 disposed on the rear side of the refrigerant heater and on the suction side of the compressor 1. The accumulator 12 in front of the compressor 1 is normally installed, but when the refrigerant heater 5 is installed as described above, the liquid absorption function is easily paralyzed by this accumulator 12 alone. It's something you end up doing.

In the figure, reference numeral 15 designates a solenoid valve for controlling the conduction of refrigerant to the outdoor heat exchanger 2, 16 a check valve, and 17 a purge solenoid valve provided in the bypass of the capillary reach tube 3. show.

As is clear from the above description of the embodiments, the air conditioning system of the present invention has a refrigerant heater, which serves as a heat supply source during heating operation, arranged in parallel with the indoor heat exchanger, so that low temperature during cooling operation can be maintained. The refrigerant gas is introduced into the compressor without passing through the refrigerant heater, and the refrigerant is sent from the compressor to the indoor heat exchanger in opposite directions during cooling and heating. Since the liquid absorbing member is installed both immediately after the compressor and near the suction port of the compressor, it is possible to prevent condensation on the refrigerant heater due to the flow of low-temperature refrigerant gas, and also to prevent the indoor heat exchanger from heating and cooling operation. The same phase of refrigerant can be passed through the connecting pipes, and the piping in this section can be unified to either liquid or gas piping. Furthermore, due to the liquid absorption function of the liquid absorption members at two locations, refrigerant in a gas-liquid mixed state is hardly sucked into the compressor during heating operation, and there is an advantage that the input to the compressor is stable at a low input.

[Brief explanation of drawings]

The drawing is a refrigerant system diagram showing a heating and cooling device as an application example of the present invention. 1... Compressor, 2... Indoor heat exchanger, 3... Capillary reach tube, 4... Indoor heat exchanger, 5... Refrigerant heater, 6... Refrigerant circuit for heating, 7... Refrigerant heating circuit, 8
... Solenoid valve, 9... Valve element, 10, 12... Accumulator, 13, 14... Communication pipe.

Claims (1)

[Scope of utility model registration request] In the cooling refrigerant circuit that goes from the compressor to the outdoor heat exchanger, capillary reach tube, indoor heat exchanger, and returns to the compressor, the intermediate section between the indoor heat exchanger and the compressor, the capillary reach tube, and the indoor heat exchanger and the intermediate part of the indoor heat exchanger,
In addition to bridging the refrigerant heating circuit that includes the refrigerant heater, the refrigerant circuit on the downstream side of the compressor is used to send refrigerant from the compressor to the indoor heat exchanger during heating operation in the opposite direction to that during cooling operation. The refrigerant circuit for heating is branched, and a resistance element is provided between the communication part of the refrigerant heating circuit and the communication part of the heating refrigerant circuit in the refrigerant circuit between the indoor heat exchanger and the compressor. An air conditioner/heater in which a liquid absorbing member is provided immediately after the refrigerant heater and near the suction port of the compressor.