JPH0243014Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] The invention includes a heat exchanger using a refrigerant heater,
The present invention relates to a refrigerant heating/cooling/heating machine that cools and heats a room, and particularly relates to a liquid refrigerant stagnation prevention device for this refrigerant heating/cooling/heating machine.

[Technical background of the invention and its problems] Conventionally, this type of refrigerant heating air-conditioning machine has a refrigerant compressor (hereinafter simply referred to as a compressor) 1, a four-way valve 2, and an indoor heat source, as shown in Figure 1. Exchanger 3, first two-way valve 4, capillary reach tube 5, outdoor heat exchanger 6
The four-way valve 2 is connected in sequence to cool and heat the room by switching the four-way valve 2.

On the other hand, in this refrigeration cycle, a refrigerant heating system piping 9 equipped with a second two-way valve 7 and a refrigerant heater 8 has one end on the second two-way valve 7 side between the compressor 1 and the four-way valve 2.
The other end on the refrigerant heater 8 side is connected between the indoor heat exchanger 3 and the first two-way valve 4 .

Further, between the indoor heat exchanger 3 and the capillary reach tube 5, a bypass passage 11 having a first check valve 10 is connected in parallel to the first two-way valve 4.

In such a cycle, during refrigerant heating and heating operation, the first two-way valve 4 is closed, the outdoor heat exchanger 6 is stopped, and the high temperature and high pressure refrigerant discharged from the compressor 1 is transferred to the indoor heat exchanger 3 as shown by the solid line arrow. It heats the room by exchanging heat with the indoor air. Then, the liquid refrigerant from the indoor heat exchanger 3 is guided to the refrigerant heater 8 of the refrigerant heating system piping 9, heated by the burner 12, and evaporated.

However, in a refrigerant heating/cooling/heating machine having such a refrigeration cycle, the first two-way valve 4 is closed during heating, and despite the presence of the first check valve 10, the refrigerant is not flowing upward as shown by the broken line arrow. A small amount of leakage may gradually leak into the capillary reach tube 5, outdoor heat exchanger 6, etc., and may remain in the outdoor heat exchanger 6.

When refrigerant accumulates in the outdoor heat exchanger 6 etc. in this way, the amount of refrigerant flowing through the refrigeration cycle decreases by the amount of accumulated refrigerant, causing the compressor 1 to operate under heavy load during normal cooling and heating, reducing operating efficiency. , the compressor 1 may be damaged as a result.

In addition, if the amount of refrigerant charged into the refrigeration cycle is significantly increased in consideration of refrigerant retention, it becomes difficult to obtain stable operation of the refrigeration cycle as the amount of refrigerant increases, and the liquid The compressor 1 may be damaged as a result.

[Purpose of the invention] The present invention has been made in view of the above-mentioned circumstances. During refrigerant heating operation, the outdoor heat exchanger on the idle side is controlled by a two-way valve or a check valve attached to the flow path. A refrigerant that aims to improve the reliability of the refrigeration cycle and improve the efficiency of cooling and heating operations by preventing the accumulation of liquid refrigerant and the resulting increase or decrease in the amount of refrigerant circulated. Our goal is to provide heating and cooling equipment.

[Summary of the invention] The present invention is a refrigerant heating air conditioner equipped with a refrigerant heater, in which a check valve and a two-way A valve is attached, and another check valve is installed in the flow path connecting the four-way valve and the compressor, and during heating, the check valve and two-way valve disconnect the outdoor heat exchanger on the idle side from the refrigeration cycle. A two-way valve is attached to both the inlet side and the outlet side of the flow path of the refrigerant heater so that the refrigerant heater can be completely separated.

[Embodiments] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings, with the same reference numerals assigned to the same constituent members as those of the above-mentioned conventional example.

In FIG. 2, the compressor 1, four-way valve 2, indoor heat exchanger 3, first two-way valve 4, heating capillary reach tube 13, capillary reach tube 5, and outdoor heat exchanger 6 are connected in sequence. , the room is heated and cooled by switching the four-way valve 2.

On the other hand, a second check valve 15 is provided in the flow path 14 between the compressor 1 and the four-way valve 2, and a first check valve 10 is provided between the indoor heat exchanger 3 and the capillary reach tube 5. The bypass flow path 11 provided with the first two-way valve 4 and the heating capillary reach tube 1
A refrigerant heating system piping 9 in which a second two-way valve 7, a refrigerant heater 8, and a third two-way valve 16 are sequentially arranged in parallel with the compressor 1 and the second two-way valve 7 has one end connected to the compressor 1 and The other end on the refrigerant heater 8 side is connected between the indoor heat exchanger 3 and the first two-way valve 4 .

Furthermore, an injection passage 18 in which a fourth two-way valve 17 is installed is connected to the compressor 1 .

Hereinafter, the operation of the present invention will be explained for each operation of cooling, heating, and refrigerant heating.

(1) During cooling operation During cooling operation, the four-way valve 2 is switched to the cooling side, the second two-way valve 7 is opened, and the other two-way valves 4 and 14 are opened.
and 17 are performed with the valve closed.

That is, by driving the compressor 1, the refrigerant discharged from the compressor 1 passes through the four-way valve 2, the outdoor heat exchanger 6, the capillary reach tube 5, the first check valve 10, the indoor heat exchanger 3, and the four-way valve 2. The liquid refrigerant is evaporated and vaporized in the indoor heat exchanger 3, thereby cooling the room.

At this time, since the second two-way valve 7 is open and the third two-way valve 16 is closed, the refrigerant does not flow into the refrigerant heater 8 due to the third two-way valve 16, and Even if a small amount of refrigerant flows into and remains in the refrigerant heater 8 , the refrigerant in the refrigerant heater 8 is sucked into the compressor 1 through the second two-way valve 7 .

(2) During heating operation During heating operation, the four-way valve 2 is switched to the heating side, the first two-way valve 4 and the second two-way valve 7 are opened, and the third
This is done by closing the two-way valve 16 and the fourth two-way valve 17.

That is, when the compressor 1 is driven, the refrigerant discharged from the compressor 1 passes through the four-way valve 2, the indoor heat exchanger 3, and
The gas refrigerant flows sequentially through the heating capillary reach tube 13, the capillary reach tube 5, the outdoor heat exchanger 6, and the four-way valve 2, and is condensed in the indoor heat exchanger 3, thereby heating the room.

At this time, as in the cooling operation, the second two-way valve 7 is open and the third two-way valve 16 is closed, so the third
Even if the refrigerant does not flow into the refrigerant heater 8 due to the two-way valve 16 and a small amount of refrigerant flows into and remains in the refrigerant heater 8, the second two-way valve 7
The refrigerant in the refrigerant heater 8 is sucked into the compressor 1 from the refrigerant heater 8 .

(3) During refrigerant heating and heating operation During refrigerant heating and heating operation, which is performed when the outside temperature is low, the four-way valve 2 is switched to the heating side, and
The first two-way valve 4 and the fourth two-way valve 17 are closed, the inflow of refrigerant to the outdoor heat exchanger 6 is separated and blocked, and the second two-way valve 7 and the third two-way valve 16 are opened. It is done as follows.

That is, when the compressor 1 is driven, the refrigerant discharged from the compressor 1 passes through the four-way valve 2, the indoor heat exchanger 3, and
The gas refrigerant flows sequentially through the third two-way valve 16, the refrigerant heater 8, the second two-way valve 7, and the four-way valve 2, and heats the room by condensing the gas refrigerant in the indoor heat exchanger 3. It is evaporated and vaporized instead of in the outdoor heat exchanger 6.

At this time, the outdoor heat exchanger 6 is connected to the first check valve 1.
0. Since the flow of the refrigerant is blocked by the second check valve 15 and the first two-way valve 4, the refrigerant no longer remains in the outdoor heat exchanger 6, and the compressor 1
The fear of running out of return refrigerant is eliminated.

Even if refrigerant accumulates in the outdoor heat exchanger 6 due to leakage from the first check valve 10 or the like, the fourth two-way valve 17 of the injection passage 18 and the second two-way valve 7 of the refrigerant heating system piping 9 By closing the third two-way valve 16 and the first two-way valve 4 and performing a gas recovery operation for a short time, the accumulated gas in the outdoor heat exchanger 6 can be removed without recovering the refrigerant in the refrigerant heater 8. Refrigerant can be recovered.

Incidentally, the fourth two-way valve 17 attached to the injection passage 18 is used as a release valve by opening it when the amount of refrigerant circulation becomes larger than necessary during refrigerant heating operation. This controls the amount of circulation to only the required amount.

Moreover, this can also be used during cooling and heating, so by controlling the opening and closing of this fourth two-way valve 17, it is possible to perform virtually four-stage control, which is useful for saving energy during cooling and heating. It is valid.

[Effects of the invention] As described above, according to the invention, a first check valve and a first two-way valve are provided in each flow path connecting an indoor heat exchanger and an outdoor heat exchanger in a refrigerant heating/cooling machine. A second check valve is attached to the flow path connecting the four-way valve and the compressor, and a second two-way valve and a third two-way valve are installed on both the inlet side and the outlet side of the flow path of the refrigerant heater. The first check valve, the second check valve, and the first two-way valve separate the outdoor heat exchanger on the inactive side from the refrigeration cycle during refrigerant heating and heating operation, and disconnect the refrigerant from the refrigeration cycle. Since stagnation can be prevented, the amount of refrigerant circulated will not be significantly increased or decreased, the compressor can be prevented from operating under heavy load or liquid back-up, and the reliability of the compressor etc. can be improved.

Furthermore, the present invention has excellent effects such as recovering only the refrigerant in the indoor heat exchanger during the refrigerant recovery operation, so that there is no risk of affecting the refrigerant in the refrigerant heater.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of a conventional refrigerant heating/cooling/heating machine, and FIG. 2 is a system diagram of a refrigerant heating/cooling/heating machine according to the present invention. 1... Compressor, 2... Four-way valve, 3... Indoor heat exchanger, 4... First two-way valve, 5... Capillary reach tube, 6... Outdoor heat exchanger, 7... Second second 8...refrigerant heater, 10...first check valve, 15...second check valve, 16...third two-way valve.

Claims (1)

[Scope of utility model registration request] Compressor, four-way valve, indoor heat exchanger, first two-way valve,
A heating capillary reach tube, a capillary reach tube, and an outdoor heat exchanger are sequentially connected to form a refrigeration cycle, and a second
A check valve is provided, and a bypass flow path having a first check valve is connected between the heating capillary reach tube and the heating capillary reach tube in parallel with the first two-way valve and the heating capillary reach tube. At the same time, a refrigerant heating system piping in which a second two-way valve, a refrigerant heater, and a third two-way valve are sequentially arranged is connected between one end of the second two-way valve and the compressor and the second check valve, A refrigerant heating/cooling/heating machine characterized in that the other end on the third two-way valve side is connected between the indoor heat exchanger and the first two-way valve.