WO2015140876A1

WO2015140876A1 - Refrigeration cycle device

Info

Publication number: WO2015140876A1
Application number: PCT/JP2014/057034
Authority: WO
Inventors: 裕樹宇賀神; 岡崎　多佳志; 石橋　晃; 真哉東井上; 伊東　大輔; 拓未西山; 繁佳松井
Original assignee: 三菱電機株式会社; 旭硝子株式会社
Priority date: 2014-03-17
Filing date: 2014-03-17
Publication date: 2015-09-24
Also published as: JPWO2015140876A1; JP6223546B2

Abstract

Provided is a refrigeration cycle device capable of ensuring adequate safety even when a refrigerant which has the property of causing a disproportionation reaction is used as the primary component. This refrigeration cycle device has a refrigerant circuit in which at least a compressor (3), a first heat exchanger (5), a pressure reduction mechanism (6), and a second heat exchanger (8) are connected, with a refrigerant which has the property of causing a disproportionation reaction being used as the primary component in the refrigerant circuit. When the pressure and/or the temperature of the refrigerant in the refrigerant circuit approaches the respective limit pressure and/or limit temperature at which the refrigerant causes a disproportionation reaction, the refrigerant is discharged from the refrigerant circuit.

Description

Refrigeration cycle equipment

The present invention relates to a refrigeration cycle apparatus using a refrigerant having a property of causing a disproportionation reaction as a main component.

Conventionally, there exists a refrigeration cycle apparatus that executes a refrigeration cycle using “HFC refrigerant” such as R410A, which is nonflammable. Unlike the conventional “HCFC refrigerant” like R22, this R410A has zero ozone depletion coefficient (hereinafter referred to as “ODP”) and does not destroy the ozone layer. (Hereinafter referred to as “GWP”). For this reason, as part of the prevention of global warming, studies are underway to change from an HFC refrigerant having a high GWP, such as R410A, to a refrigerant having a low GWP (hereinafter referred to as a “low GWP refrigerant”).

As a candidate for a low GWP refrigerant, there is an HFC refrigerant having no carbon double bond in the composition, for example, R32 (CH ₂ F ₂ ; difluoromethane) having a lower GWP than R410A. Further, as a similar candidate refrigerant, there is a halogenated hydrocarbon having a carbon double bond in the composition, which is a kind of HFC refrigerant like R32. As such a halogenated hydrocarbon, for example, HFO-1234yf (CF ₃ CF═CH ₂ ; tetrafluoropropene) and HFO-1234ze (CF ₃ —CH═CHF) are known. In order to distinguish from an HFC refrigerant having no carbon double bond in the composition such as R32, an HFC refrigerant having a carbon double bond is changed to an olefin (unsaturated hydrocarbon having a carbon double bond). It is often expressed as “HFO refrigerant” using “O” (called olefin).

Furthermore, as a similar candidate refrigerant, HFO-1123 (CF ₂ ═CHF; 1, 1, ₂ trifluoroethene (ethylene)), which is a kind of HFO refrigerant, is known as well as HFO-1234yf and HFO-1234ze. Yes. This HFO-1123 has a property of causing a disproportionation reaction (autolysis reaction). When a disproportionation reaction occurs, the reaction proceeds explosively. The disproportionation reaction generates heat and HF (hydrogen fluoride) as shown in the following reaction formula.
CF ₂ = CHF → 1 / 2CF ₄ + 3 / 2C + HF + 44.7 kcal / mol
Therefore, when HFO-1123 is used, care must be taken not to cause a disproportionation reaction.

Note that an air conditioner has been proposed that uses a combustible refrigerant and immediately responds to the leakage of the refrigerant when the refrigerant leaks (see, for example, Patent Document 1). The air conditioner described in Patent Document 1 is “the indoor unit and the outdoor unit are integrated, and the indoor heat exchanger, the outdoor heat exchanger, the compressor, and the expansion device are connected in a ring shape through a pipe, In a refrigeration cycle using a flammable refrigerant as a refrigerant, a gas sensor is provided on the indoor side, a refrigerant discharge unit is provided on the outdoor side, and the gas sensor detects refrigerant leakage from the refrigeration cycle to the outside. The part is opened and the refrigerant is exhausted to the outside ”.

Japanese Patent Laid-Open No. 11-304226 (Example 1)

However, since the technique described in Patent Document 1 relates to the case where the refrigerant leaks, even if HFO-1123 is used in the technique described in Patent Document 1, the disproportionation reaction is not performed in advance. It cannot be prevented. Assuming that HFO-1123 is used in the technique described in Patent Document 1, since the refrigerant is burned using a burner, a disproportionation reaction has occurred or an error has occurred. There remains a problem with safety against activation.

The present invention has been made to solve the above-described problems, and even when a refrigerant having a property of causing a disproportionation reaction is used as a main component, a refrigeration cycle that can ensure sufficient safety. An object is to provide an apparatus.

A refrigeration cycle apparatus according to the present invention has a refrigerant circuit to which at least a compressor, a first heat exchanger, a decompression mechanism, and a second heat exchanger are connected, and has a property of causing a disproportionation reaction in the refrigerant circuit. When at least one of the pressure and temperature of the refrigerant in the refrigerant circuit approaches at least one of the limit pressure and the limit temperature at which the refrigerant causes a disproportionation reaction, The refrigerant is discharged from the refrigerant circuit.

According to the refrigeration cycle apparatus of the present invention, when at least one of the pressure and temperature of the refrigerant in the refrigerant circuit approaches at least one of the pressure and temperature at which the refrigerant causes a disproportionation reaction, that is, the refrigerant is incomplete. Since the refrigerant is discharged from the refrigerant circuit before the leveling reaction occurs, even if the refrigerant causing the leveling reaction is used as a main component, sufficient safety can be ensured.

It is a schematic block diagram which shows an example of the refrigerant circuit structure of the refrigerating-cycle apparatus which concerns on Embodiment 1 of this invention. It is a schematic block diagram which shows another example of the refrigerant circuit structure of the refrigerating-cycle apparatus which concerns on Embodiment 1 of this invention. It is a schematic block diagram which shows another example of the refrigerant circuit structure of the refrigerating-cycle apparatus which concerns on Embodiment 1 of this invention. It is a schematic block diagram which shows another example of the refrigerant circuit structure of the refrigerating-cycle apparatus which concerns on Embodiment 1 of this invention. It is a schematic block diagram which shows an example of the refrigerant circuit structure of the refrigerating-cycle apparatus which concerns on Embodiment 2 of this invention. It is a schematic block diagram which shows another example of the refrigerant circuit structure of the refrigerating-cycle apparatus which concerns on Embodiment 2 of this invention. It is a schematic block diagram which shows another example of the refrigerant circuit structure of the refrigerating-cycle apparatus which concerns on Embodiment 2 of this invention. It is a schematic block diagram which shows another example of the refrigerant circuit structure of the refrigerating-cycle apparatus which concerns on Embodiment 2 of this invention. It is a schematic block diagram which shows an example of the refrigerant circuit structure of the refrigerating-cycle apparatus which concerns on Embodiment 3 of this invention. It is a schematic block diagram which shows another example of the refrigerant circuit structure of the refrigerating-cycle apparatus which concerns on Embodiment 3 of this invention. It is a schematic block diagram which shows another example of the refrigerant circuit structure of the refrigerating-cycle apparatus which concerns on Embodiment 3 of this invention. It is a schematic block diagram which shows another example of the refrigerant circuit structure of the refrigerating-cycle apparatus which concerns on Embodiment 3 of this invention. It is a schematic block diagram which shows an example of the refrigerant circuit structure of the refrigerating-cycle apparatus which concerns on Embodiment 4 of this invention. It is a schematic block diagram which shows another example of the refrigerant circuit structure of the refrigerating-cycle apparatus which concerns on Embodiment 4 of this invention. It is a schematic block diagram which shows another example of the refrigerant circuit structure of the refrigerating-cycle apparatus which concerns on Embodiment 4 of this invention. It is a schematic block diagram which shows another example of the refrigerant circuit structure of the refrigerating-cycle apparatus which concerns on Embodiment 4 of this invention. It is a schematic block diagram which shows an example of the refrigerant circuit structure of the refrigerating-cycle apparatus which concerns on Embodiment 5 of this invention. It is a schematic block diagram which shows another example of the refrigerant circuit structure of the refrigerating-cycle apparatus which concerns on Embodiment 5 of this invention. It is a schematic block diagram which shows another example of the refrigerant circuit structure of the refrigerating-cycle apparatus which concerns on Embodiment 5 of this invention. It is a schematic block diagram which shows another example of the refrigerant circuit structure of the refrigerating-cycle apparatus which concerns on Embodiment 5 of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings as appropriate. In addition, in the following drawings including FIG. 1, the relationship of the size of each component may be different from the actual one. Further, in the following drawings including FIG. 1, the same reference numerals denote the same or equivalent parts, and this is common throughout the entire specification. Furthermore, the forms of the constituent elements shown in the entire specification are merely examples, and are not limited to these descriptions.

Embodiment 1 FIG.
FIG. 1 is a schematic configuration diagram showing an example of a refrigerant circuit configuration of a refrigeration cycle apparatus (hereinafter referred to as refrigeration cycle apparatus 100A) according to Embodiment 1 of the present invention. FIG. 2 is a schematic configuration diagram showing another example of the refrigerant circuit configuration of the refrigeration cycle apparatus 100A. FIG. 3 is a schematic configuration diagram showing still another example of the refrigerant circuit configuration of the refrigeration cycle apparatus 100A. FIG. 4 is a schematic configuration diagram showing still another example of the refrigerant circuit configuration of the refrigeration cycle apparatus 100A. The refrigeration cycle apparatus 100A will be described with reference to FIGS.

The refrigeration cycle apparatus 100A is assumed to use a refrigerant having a property of causing a disproportionation reaction as a main component, and includes an outdoor unit 1 and an indoor unit 2. The outdoor unit 1 and the indoor unit 2 are connected via a liquid pipe 7 and a gas pipe 9.

The outdoor unit (heat source unit) 1 includes a compressor 3 for compressing refrigerant, a four-way valve 4 as refrigerant circuit switching means for switching the refrigerant flow path, air around the outdoor unit 1 conveyed by the refrigerant and the outdoor blower 5a, and An outdoor heat exchanger (first heat exchanger) 5 for exchanging heat and an electronic expansion valve 6 (an example of a decompression mechanism) for controlling the flow rate of the refrigerant. Moreover, the outdoor heat exchanger 5 has the outdoor air blower 5a which supplies air.
The indoor unit (use-side unit) 2 exchanges heat between the refrigerant and the air around the indoor unit 2 conveyed by the indoor blower 8a, and cools or heats the indoor space by, for example, cooling or heating the indoor space. A heat exchanger (second heat exchanger) 8 is provided. The indoor heat exchanger 8 has an indoor blower 8a that supplies air.

As the compressor 3 for compressing the refrigerant, it is preferable to use a positive displacement compressor of a type in which the rotation speed is controlled by an inverter circuit and the capacity is controlled. Examples of the positive displacement compressor include a rotary compressor, a scroll compressor, a screw compressor, and a reciprocating compressor. The compressor 3 is provided with an electric motor. A discharge pipe 3 a is connected to the compressor 3. The discharge pipe 3a is provided with a pressure detector 21 for measuring the discharge pressure of the refrigerant and a temperature detector 22 for measuring the discharge temperature of the refrigerant.

The four-way valve 4 switches the refrigerant flow path according to a cooling / heating supply mode (for example, cooling operation mode) and a heating / heating supply mode (for example, heating operation mode).
Although the four-way valve 4 will be described as an example of the refrigerant circuit switching unit, the refrigerant circuit switching unit may be configured by combining two refrigerant valves, for example, two two-way valves or three-way valves. Good. Moreover, although the case where the four-way valve 4 is provided is shown as an example, when the refrigerant circuit configuration in which the refrigerant flow path is not switched is adopted as the refrigeration cycle apparatus 100A, it is not necessary to provide the refrigerant circuit switching means.

The outdoor heat exchanger 5 functions as a condenser or an evaporator, and can be constituted by, for example, a cross-fin type fin-and-tube heat exchanger constituted by heat transfer tubes and a large number of fins.
In the outdoor heat exchanger 5, a case where heat is exchanged between the refrigerant and air is shown as an example. However, heat exchange may be performed between the refrigerant and a heat medium (for example, water or brine) other than air. Further, depending on the heat medium to be heat-exchanged, the outdoor heat exchanger 5 is, for example, a microchannel heat exchanger, a shell-and-tube heat exchanger, a heat pipe heat exchanger, a double pipe heat exchanger, a plate A heat exchanger or the like may be used.
Moreover, although the case where a 1st heat exchanger is the outdoor heat exchanger 5 is demonstrated to an example, a 1st heat exchanger is not limited to the outdoor heat exchanger 5, and a 1st heat exchanger is a heat source side. What is necessary is just a heat exchanger (namely, heat source side heat exchanger).

The outdoor blower 5a supplies air to the outdoor heat exchanger 5, and is configured to be capable of changing the flow rate of air. For example, a centrifugal fan or a multiblade fan driven by a motor such as a DC fan motor can be used as the outdoor fan 5a.
When heat is exchanged between the refrigerant and a heat medium other than air in the outdoor heat exchanger 5, a transfer device such as a pump may be provided instead of the outdoor fan 5a.

The electronic expansion valve 6 can adjust the refrigerant flow rate.
As an example of the pressure reducing mechanism, the electronic expansion valve 6 having a structure with a variable throttle opening is described as an example. However, the present invention is not limited to this, and a mechanical expansion using a diaphragm for the pressure receiving portion. You may comprise a pressure reduction mechanism with a valve or a capillary tube.

The indoor heat exchanger 8 functions as an evaporator or a condenser, and can be constituted by, for example, a cross-fin type fin-and-tube heat exchanger constituted by heat transfer tubes and a large number of fins.
Note that, in the indoor heat exchanger 8, a case where heat is exchanged between the refrigerant and air is shown as an example, but heat exchange may be performed between the refrigerant and a heat medium (for example, water or brine) other than air. Further, depending on the heat medium to be heat-exchanged, the indoor heat exchanger 8 is, for example, a microchannel heat exchanger, a shell-and-tube heat exchanger, a heat pipe heat exchanger, a double pipe heat exchanger, a plate A heat exchanger or the like may be used.
Moreover, although the case where a 2nd heat exchanger is the indoor heat exchanger 8 is demonstrated to an example, a 2nd heat exchanger is not limited to the indoor heat exchanger 8, and a 2nd heat exchanger is a utilization side. What is necessary is just a heat exchanger (namely, utilization side heat exchanger).

The indoor fan 8a supplies air to the indoor heat exchanger 8, and is configured to be capable of changing the flow rate of air. For example, a centrifugal fan or a multiblade fan driven by a motor such as a DC fan motor can be used as the indoor fan 8a.
When heat is exchanged between the refrigerant and a heat medium other than air in the indoor heat exchanger 8, a transfer device such as a pump may be provided instead of the indoor blower 8a.

And the outdoor unit 1 and the indoor unit 2 comprise a refrigerant circuit by connecting each element apparatus by the liquid pipe 7 and the gas pipe 9 which are refrigerant flow paths.
In addition, the connection algebra of the outdoor unit 1 and the indoor unit 2 is not limited to one, and any one or each may be a plurality.

Further, the refrigeration cycle apparatus 100A includes a control device 30 that performs overall control of the refrigeration cycle apparatus 100A. The control device 30 controls each actuator (driving components such as the compressor 3, the four-way valve 4, the outdoor blower 5a, the electronic expansion valve 6, and the indoor blower 8a) based on the detection value from each detector. The control device 30 can be configured by hardware such as a circuit device that realizes the function, or can be configured by an arithmetic device such as a microcomputer or a CPU and software executed thereon.

In FIG. 1, in the cold supply mode (for example, cooling operation) in which cold heat is supplied from the indoor heat exchanger 8, the four-way valve 4 becomes a solid flow path, and a hot heat supply mode (for example, supplying warm heat from the indoor heat exchanger 8) In the heating operation), the four-way valve 4 is switched to the dotted flow path. Therefore, in the cold heat supply mode, the compressor 3, the four-way valve 4, the outdoor heat exchanger 5, the electronic expansion valve 6, the indoor heat exchanger 8, and the compressor 3 are connected in an annular shape in this order. In the heat supply mode, the compressor 3, the four-way valve 4, the indoor heat exchanger 8, the electronic expansion valve 6, the outdoor heat exchanger 5, and the compressor 3 are annularly connected in this order. Therefore, in the cold heat supply mode, the outdoor heat exchanger 5 functions as a condenser, and the indoor heat exchanger 8 functions as an evaporator. In the heat supply mode, the outdoor heat exchanger 5 functions as an evaporator, and the indoor heat exchanger 8 functions as a condenser.

Next, the refrigerant used for the refrigeration cycle apparatus 100A will be described.
As a refrigerant used in the

refrigeration cycle apparatus

100A, 1, 1, 2 trifluoroethylene (HFO-1123) having a low GWP and a high operating pressure is used as a main component. As shown in the following reaction formula, HFO-1123 undergoes a disproportionation reaction in which a substance having heat and toxicity (HF) is generated under high temperature and high pressure.
CF ₂ = CHF → 1 / 2CF ₄ + 3 / 2C + HF + 44.7 kcal / mol
Note that the main component of HFO-1123 is that the content of other refrigerants (which may be a plurality of types of refrigerants) to be mixed, including the fact that HFO-1123 is used alone, It means that the content is not exceeded by mass%.

Therefore, in the refrigeration cycle apparatus 100A, when at least one of the pressure and temperature of the refrigerant in the refrigerant circuit approaches at least one of the pressure and temperature at which HFO-1123 causes a disproportionation reaction, that is, HFO-1123 Before the disproportionation reaction takes place, the refrigerant mainly composed of HFO-1123 is released from the refrigerant circuit to prevent the occurrence of the disproportionation reaction. Specifically, the refrigeration cycle apparatus 100A releases the refrigerant from the refrigerant circuit before the HFO-1123 undergoes a disproportionation reaction via the refrigerant release pipe 15 connected to the shell of the compressor 3. I am doing so. Since the compressor 3 includes an electric motor in the shell, there is a possibility that the compressor 3 may become an ignition source of the refrigerant having a high temperature and a high pressure. Therefore, a pipe 15 is connected to the compressor 3 so that the refrigerant is directly discharged from the compressor 3.

For example, in the shell of the compressor 3, when the refrigerant whose main component is HFO-1123 becomes 0.9 times the limit pressure causing the disproportionation reaction of HFO-1123, or the disproportionation reaction is performed. The refrigerant may be discharged from the refrigerant circuit via the pipe 15 when the temperature is lower by 10 ° C. than the limit temperature at which it occurs. Specifically, the pipe 15 is communicated with a part of the compression chamber for compressing the refrigerant of the compressor 3. When the communication portion of the pipe 15 does not operate in the state at the normal operation pressure or normal operation temperature, and the pressure or temperature before the HFO-1123 reaches the pressure or temperature causing the disproportionation reaction. At least a valve that operates is provided. Then, in accordance with the operation of the valve, the refrigerant in the middle of compression may be discharged from the shell to the outside of the refrigeration cycle. For example, in a refrigerant in which HFO-1123: HFO-1234yf is mixed at a molar ratio of 60:40 or 70:30, the limit pressure causing the disproportionation reaction is 3.5 to 4.0 MPa, and the limit temperature is 120 to 130 ° C. Therefore, when 3.2 to 3.6 MPa which is 0.9 times the critical pressure or 110 to 120 ° C. which is −10 ° C. which is the critical temperature is detected, the refrigerant is discharged from the refrigerant circuit.

By doing so, the refrigerant mainly composed of HFO-1123 can be discharged to the outside of the refrigeration cycle before the disproportionation reaction occurs, and the disproportionation reaction can be prevented in advance. . The case where the refrigerant is discharged to the outside of the refrigeration cycle when HFO-1123 reaches the pressure or temperature before the pressure or temperature at which the disproportionation reaction occurs will be described as an example. With one piece of information, it may be determined whether to release the refrigerant outside the refrigeration cycle.

<Refrigerant release means shown in FIG. 1>
In the refrigeration cycle apparatus 100A shown in FIG. 1, one end side of the pipe 15 (the end side that is not the end portion on the compressor 3 side) is positioned outside the outdoor unit 1, and a valve 10 that can be opened and closed is installed there. ing. The valve 10 is controlled to be opened and closed by a control device 30 that receives detection information from the pressure detector 21 or the temperature detector 22. That is, when the control device 30 determines from the detection information of the pressure detector 21 or the temperature detector 22 that the pressure or temperature before the HFO-1123 has reached the pressure or temperature causing the disproportionation reaction, 10 is opened, and the refrigerant is discharged to the outside of the refrigeration cycle through the pipe 15.

As described above, in the refrigeration cycle apparatus 100A shown in FIG. 1, before HFO-1123 undergoes a disproportionation reaction, the refrigerant mainly composed of HFO-1123 is discharged outside the refrigeration cycle outside the outdoor unit 1. By opening to the atmosphere, disproportionation reaction can be prevented. In addition, as conditions for opening the valve 10, the pressure or temperature detected by the discharge pipe 3a is, for example, 0.9 times the limit pressure causing the disproportionation reaction or the limit temperature causing the disproportionation reaction. It may be when a temperature lower by 10 ° C. is detected.

<Refrigerant Release Means Shown in FIG. 2>
In the refrigeration cycle apparatus 100A shown in FIG. 2, one end side of the pipe 15 (the end side that is not the end portion on the compressor 3 side) is constituted by the branch pipe 11 having a smaller diameter than the liquid pipe 7 and the gas pipe 9. It is located outside the outdoor unit 1 with its one end side closed. That is, the branch pipe 11 is destroyed when the pressure or temperature before the pressure or temperature at which HFO-1123 causes a disproportionation reaction is reached, and the refrigerant is transferred to the outside of the refrigeration cycle via the broken branch pipe 11. Release. For example, the tip of the branch pipe 11 can be closed using a pinch-off pliers or the like.

As described above, in the refrigeration cycle apparatus 100A shown in FIG. 2, before HFO-1123 undergoes a disproportionation reaction, the refrigerant mainly composed of HFO-1123 is released to the outside of the outdoor unit 1 to disproportionately. The chemical reaction can be prevented. In addition, as conditions for destroying the branch pipe 11, the pressure or temperature detected by the discharge pipe 3a is, for example, 0.9 times the limit pressure causing the disproportionation reaction, or the limit temperature causing the disproportionation reaction It may be when a temperature lower by 10 ° C. is detected.

<Refrigerant Release Means Shown in FIG. 3>
In the refrigeration cycle apparatus 100A shown in FIG. 3, one end side of the pipe 15 (the end side that is not the end part on the compressor 3 side) is configured with the branch pipe 11 having a smaller diameter than the liquid pipe 7 and the gas pipe 9. The one end side is positioned outside the outdoor unit 1 with the cap 12 closed. That is, the cap 12 comes off or breaks when the pressure or temperature before the pressure or temperature at which the HFO-1123 undergoes a disproportionation reaction is reached, and releases the refrigerant to the outside of the refrigeration cycle via the branch pipe 11. . As the cap 12, for example, a low proof stress copper cap may be used.

As described above, in the refrigeration cycle apparatus 100A shown in FIG. 3, before HFO-1123 undergoes a disproportionation reaction, the refrigerant mainly composed of HFO-1123 is released to the atmosphere outside the outdoor unit 1 to disproportionately. The chemical reaction can be prevented. In addition, as conditions for the cap 12 to be removed or broken, the pressure or temperature detected in the discharge pipe 3a is, for example, 0.9 times the limit pressure causing the disproportionation reaction, or the limit temperature causing the disproportionation reaction. It may be when a temperature lower by 10 ° C. is detected.

<Refrigerating means shown in FIG. 4>
In the refrigeration cycle apparatus 100A shown in FIG. 4, one end side of the pipe 15 (the end side that is not the end portion on the compressor 3 side) is positioned outside the outdoor unit 1, and the valve 10 is installed there. A branch pipe 11 having a diameter smaller than that of the liquid pipe 7 and the gas pipe 9 is connected to one end side (the end side that is not the end portion on the compressor 3 side) via a flare nut 13. One end of the branch pipe 11 is closed. That is, when the control device 30 determines from the detection information of the pressure detector 21 or the temperature detector 22 that the pressure or temperature before the HFO-1123 has reached the pressure or temperature causing the disproportionation reaction, When 10 is opened and the branch pipe 11 is broken, the refrigerant is discharged to the outside of the refrigeration cycle through the branch pipe 11.

However, even if the pressure detector 21 or the temperature detector 22 detects an incorrect value and the control device 30 opens the valve 10 by mistake, the branch pipe 11 is connected to the tip of the valve 10, so that the refrigerant It will never be released. By connecting the valve 10 and the branch pipe 11 with the flare nut 13, for example, at the time of service, it is only necessary to replace the flare connection portion, so that serviceability is improved. A cap 12 shown in FIG. 3 may be provided at the tip of the branch pipe 11.

As described above, in the refrigeration cycle apparatus 100A shown in FIG. 4, before HFO-1123 undergoes a disproportionation reaction, the refrigerant mainly composed of HFO-1123 is released to the atmosphere outside the outdoor unit 1 to disproportionately. The chemical reaction can be prevented. The condition for opening the valve 10 and the condition for destroying the branch pipe 11 are, for example, a pressure or temperature detected by the discharge pipe 3a that is 0.9 times the limit pressure that causes a disproportionation reaction, or a non-uniformity. The temperature may be 10 ° C. lower than the limit temperature at which the leveling reaction occurs.

In addition, after the branch pipe 11 is broken, both the pressure and temperature of the refrigerant in the refrigerant circuit are such that the pressure at which the HFO-1123 does not cause a disproportionation reaction (for example, a limit pressure of 0.8 that causes a disproportionation reaction). Double pressure) and temperature (for example, a temperature 20 ° C. lower than the limit temperature at which the disproportionation reaction occurs), if the valve 10 is closed, the refrigerant can be prevented from leaking more than necessary. In this case, in addition to the valve 10, another valve may be provided in the pipe 15 to close the pipe 15.

Embodiment 2. FIG.
FIG. 5 is a schematic configuration diagram showing an example of a refrigerant circuit configuration of a refrigeration cycle apparatus (hereinafter referred to as refrigeration cycle apparatus 100B) according to Embodiment 2 of the present invention. FIG. 6 is a schematic configuration diagram showing another example of the refrigerant circuit configuration of the refrigeration cycle apparatus 100B. FIG. 7 is a schematic configuration diagram showing still another example of the refrigerant circuit configuration of the refrigeration cycle apparatus 100B. FIG. 8 is a schematic configuration diagram showing still another example of the refrigerant circuit configuration of the refrigeration cycle apparatus 100B. The refrigeration cycle apparatus 100B will be described with reference to FIGS. In the second embodiment, differences from the first embodiment will be mainly described, and the same parts as those in the first embodiment will be denoted by the same reference numerals and description thereof will be omitted.

The basic configuration of the refrigeration cycle apparatus 100B is the same as that of the refrigeration cycle apparatus 100A according to Embodiment 1. In Embodiment 1, although the example which connected the piping 15 to the shell of the compressor 3 was shown, in Embodiment 2, the piping 15 is connected to the discharge piping 3a of the compressor 3. FIG. A refrigerant having a high temperature and a high pressure flows through the discharge pipe 3a. Therefore, the refrigerant is quickly discharged from the high-pressure discharge pipe 3a. Other configurations of the refrigeration cycle apparatus 100B are the same as those of the refrigeration cycle apparatus 100A according to the first embodiment. The refrigerant used for the refrigeration cycle apparatus 100B is the same as that of the refrigeration cycle apparatus 100A according to Embodiment 1.

<Refrigerating means shown in FIG. 5>
In the refrigeration cycle apparatus 100B shown in FIG. 5, one end side of the pipe 15 (the end side that is not the discharge pipe 3a side end) is positioned outside the outdoor unit 1, and the valve 10 is installed there. The valve 10 is controlled to be opened and closed by the control device 30 as described in the first embodiment.

As described above, in the refrigeration cycle apparatus 100B shown in FIG. 5, before HFO-1123 undergoes a disproportionation reaction, the refrigerant mainly composed of HFO-1123 is released to the outside of the outdoor unit 1 to disproportionately. The chemical reaction can be prevented. The conditions for opening the valve 10 are as described in the first embodiment.

<Refrigerant Release Means Shown in FIG. 6>
In the refrigeration cycle apparatus 100B shown in FIG. 6, one end side of the pipe 15 (the end side that is not the end part on the discharge pipe 3a side) is configured with the branch pipe 11 having a smaller diameter than the liquid pipe 7 and the gas pipe 9, It is located outside the outdoor unit 1 with its one end side closed. As described in the first embodiment, the branch pipe 11 is broken at a predetermined pressure or a predetermined temperature.

As described above, in the refrigeration cycle apparatus 100B shown in FIG. 6, before HFO-1123 undergoes a disproportionation reaction, the refrigerant mainly composed of HFO-1123 is released to the outside of the outdoor unit 1 to disproportionately. The chemical reaction can be prevented. The conditions for breaking the branch pipe 11 are as described in the first embodiment.

<Refrigerant Release Means Shown in FIG. 7>
In the refrigeration cycle apparatus 100B shown in FIG. 7, one end side of the pipe 15 (the end side which is not the discharge pipe 3a side end) is constituted by the branch pipe 11 having a smaller diameter than the liquid pipe 7 and the gas pipe 9. The one end side is positioned outside the outdoor unit 1 with the cap 12 closed. As described in Embodiment 1, the cap 12 is configured to come off or break at a predetermined pressure or a predetermined temperature.

As described above, in the refrigeration cycle apparatus 100B shown in FIG. 7, before HFO-1123 undergoes a disproportionation reaction, the refrigerant containing HFO-1123 as a main component is released to the atmosphere outside the outdoor unit 1 to disproportionately. The chemical reaction can be prevented. The conditions for removing or breaking the cap 12 are as described in the first embodiment.

<Refrigerant release means shown in FIG. 8>
In the refrigeration cycle apparatus 100B shown in FIG. 8, one end side of the pipe 15 (the end side that is not the end on the discharge pipe 3a side) is positioned outside the outdoor unit 1, and the valve 10 is installed there. A branch pipe 11 having a diameter smaller than that of the liquid pipe 7 and the gas pipe 9 is connected to one end side (the end portion side which is not the discharge pipe 3a side end portion) via a flare nut 13. The valve 10 is controlled to be opened and closed by the control device 30 as described in the first embodiment. As described in the first embodiment, the branch pipe 11 is broken at a predetermined pressure or a predetermined temperature. In addition, you may make it provide the cap 12 shown in FIG.

As described above, in the refrigeration cycle apparatus 100B shown in FIG. 8, before HFO-1123 undergoes a disproportionation reaction, the refrigerant mainly composed of HFO-1123 is released to the outside of the outdoor unit 1 to disproportionately. The chemical reaction can be prevented. Further, as described in the first embodiment, even when the valve 10 is opened by mistake, the refrigerant is not opened as long as the branch pipe 11 is not broken, and serviceability is improved. The conditions for opening the valve 10 and the conditions for breaking the branch pipe 11 are as described in the first embodiment. Moreover, the blockage of the pipe 15 after the branch pipe 11 is broken is also as described in the first embodiment.

Embodiment 3 FIG.
FIG. 9 is a schematic configuration diagram showing an example of a refrigerant circuit configuration of a refrigeration cycle apparatus (hereinafter referred to as refrigeration cycle apparatus 100C) according to Embodiment 3 of the present invention. FIG. 10 is a schematic configuration diagram illustrating another example of the refrigerant circuit configuration of the refrigeration cycle apparatus 100C. FIG. 11 is a schematic configuration diagram illustrating still another example of the refrigerant circuit configuration of the refrigeration cycle apparatus 100C. FIG. 12 is a schematic configuration diagram showing still another example of the refrigerant circuit configuration of the refrigeration cycle apparatus 100C. The refrigeration cycle apparatus 100C will be described with reference to FIGS. In the third embodiment, differences from the first and second embodiments will be mainly described, and the same parts as those in the first and second embodiments will be denoted by the same reference numerals and the description thereof will be omitted.

The basic configuration of the refrigeration cycle apparatus 100C is the same as that of the refrigeration cycle apparatus 100A according to the first embodiment. In the first embodiment, an example in which the pipe 15 is connected to the shell of the compressor 3 has been shown, but in the third embodiment, the pipe 15 is connected to the gas pipe 9. Other configurations of the refrigeration cycle apparatus 100C are the same as those of the refrigeration cycle apparatus 100A according to Embodiment 1. The refrigerant used for the refrigeration cycle apparatus 100C is the same as that of the refrigeration cycle apparatus 100A according to the first embodiment.

<Refrigerating means shown in FIG. 9>
In the refrigeration cycle apparatus 100C shown in FIG. 9, one end side of the pipe 15 (the end side that is not the end portion on the gas pipe 9 side) is positioned outside the outdoor unit 1, and the valve 10 is installed there. The valve 10 is controlled to be opened and closed by the control device 30 as described in the first embodiment.

As described above, in the refrigeration cycle apparatus 100C shown in FIG. 9, before HFO-1123 undergoes a disproportionation reaction, the refrigerant mainly composed of HFO-1123 is released to the outside of the outdoor unit 1 to disproportionately. The chemical reaction can be prevented. The conditions for opening the valve 10 are as described in the first embodiment.

<Refrigerant release means shown in FIG. 10>
In the refrigeration cycle apparatus 100C shown in FIG. 10, one end side of the pipe 15 (the end side that is not the gas pipe 9 side end) is configured with the liquid pipe 7 and the branch pipe 11 having a smaller diameter than the gas pipe 9. It is located outside the outdoor unit 1 with its one end side closed. As described in the first embodiment, the branch pipe 11 is broken at a predetermined pressure or a predetermined temperature.

As described above, in the refrigeration cycle apparatus 100C shown in FIG. 10, before HFO-1123 undergoes a disproportionation reaction, the refrigerant mainly composed of HFO-1123 is released to the outside of the outdoor unit 1 to disproportionately. The chemical reaction can be prevented. The conditions for breaking the branch pipe 11 are as described in the first embodiment.

<Refrigerant release means shown in FIG. 11>
In the refrigeration cycle apparatus 100C shown in FIG. 11, one end side of the pipe 15 (the end side that is not the gas pipe 9 side end) is constituted by the liquid pipe 7 and the branch pipe 11 having a smaller diameter than the gas pipe 9. The one end side is positioned outside the outdoor unit 1 with the cap 12 closed. As described in Embodiment 1, the cap 12 is configured to come off or break at a predetermined pressure or a predetermined temperature.

As described above, in the refrigeration cycle apparatus 100C shown in FIG. 11, before HFO-1123 undergoes a disproportionation reaction, the refrigerant containing HFO-1123 as a main component is released to the atmosphere outside the outdoor unit 1 to disproportionately. The chemical reaction can be prevented. The conditions for removing or breaking the cap 12 are as described in the first embodiment.

<Refrigerant release means shown in FIG. 12>
In the refrigeration cycle apparatus 100C shown in FIG. 12, one end side of the pipe 15 (the end side that is not the gas pipe 9 side end) is positioned outside the outdoor unit 1, and the valve 10 is installed there. A branch pipe 11 having a diameter smaller than that of the liquid pipe 7 and the gas pipe 9 is connected to one end side (the end side which is not the gas pipe 9 side end) via a flare nut 13. The valve 10 is controlled to be opened and closed by the control device 30 as described in the first embodiment. As described in the first embodiment, the branch pipe 11 is broken at a predetermined pressure or a predetermined temperature. In addition, you may make it provide the cap 12 shown in FIG.

As described above, in the refrigeration cycle apparatus 100C shown in FIG. 12, before HFO-1123 undergoes a disproportionation reaction, the refrigerant mainly composed of HFO-1123 is released to the outside of the outdoor unit 1 to disproportionately. The chemical reaction can be prevented. Further, as described in the first embodiment, even when the valve 10 is opened by mistake, the refrigerant is not opened as long as the branch pipe 11 is not broken, and serviceability is improved. The conditions for opening the valve 10 and the conditions for breaking the branch pipe 11 are as described in the first embodiment. Moreover, the blockage of the pipe 15 after the branch pipe 11 is broken is also as described in the first embodiment.

Embodiment 4 FIG.
FIG. 13 is a schematic configuration diagram showing an example of a refrigerant circuit configuration of a refrigeration cycle apparatus (hereinafter referred to as refrigeration cycle apparatus 100D) according to Embodiment 4 of the present invention. FIG. 14 is a schematic configuration diagram illustrating another example of the refrigerant circuit configuration of the refrigeration cycle apparatus 100D. FIG. 15 is a schematic configuration diagram showing still another example of the refrigerant circuit configuration of the refrigeration cycle apparatus 100D. FIG. 16 is a schematic configuration diagram showing still another example of the refrigerant circuit configuration of the refrigeration cycle apparatus 100D. The refrigeration cycle apparatus 100D will be described based on FIGS. In the fourth embodiment, differences from the first to third embodiments will be mainly described, and the same parts as those in the first to third embodiments will be denoted by the same reference numerals and the description thereof will be omitted.

The basic configuration of the refrigeration cycle apparatus 100D is the same as that of the refrigeration cycle apparatus 100A according to the first embodiment. In the first embodiment, the example in which one of the pipes 15 is connected to the shell of the compressor 3 and the other of the pipes 15 is positioned outside the outdoor unit 1 is shown. Is connected to the shell of the compressor 3, and the other side of the pipe 15 is positioned on the suction side of the outdoor fan 5a. Other configurations of the refrigeration cycle apparatus 100D are the same as those of the refrigeration cycle apparatus 100A according to Embodiment 1. The refrigerant used for the refrigeration cycle apparatus 100D is the same as that of the refrigeration cycle apparatus 100A according to the first embodiment.

<Refrigerating means shown in FIG. 13>
In the refrigeration cycle apparatus 100D shown in FIG. 13, one end side of the pipe 15 (the end side that is not the end portion on the compressor 3 side) is positioned on the suction side of the outdoor fan 5a, and the valve 10 is installed there. . And the control apparatus 30 operates the outdoor air blower 5a, when the valve | bulb 10 is open | released. The valve 10 is controlled to be opened and closed by the control device 30 as described in the first embodiment.

As described above, in the refrigeration cycle apparatus 100D shown in FIG. 13, before HFO-1123 undergoes a disproportionation reaction, the refrigerant mainly composed of HFO-1123 is discharged to the outside of the refrigeration cycle, and is supplied to the outdoor unit 1. The disproportionation reaction can be prevented by quickly releasing the air using the outdoor fan 5a accommodated. The conditions for opening the valve 10 are as described in the first embodiment.

<Refrigerating means for refrigerant shown in FIG. 14>
In the refrigeration cycle apparatus 100D shown in FIG. 14, one end side of the pipe 15 (the end side that is not the end portion on the compressor 3 side) is configured by the branch pipe 11 having a smaller diameter than the liquid pipe 7 and the gas pipe 9. With the one end side closed, the outdoor blower 5a is positioned on the suction side. And the control apparatus 30 operates the outdoor air blower 5a, when the branch pipe 11 is destroyed. As described in the first embodiment, the branch pipe 11 is broken at a predetermined pressure or a predetermined temperature. Whether or not the branch pipe 11 is broken may be estimated based on measured values of the pressure detector 21 and the temperature detector 22, for example.

As described above, in the refrigeration cycle apparatus 100D shown in FIG. 14, before HFO-1123 undergoes a disproportionation reaction, the refrigerant mainly composed of HFO-1123 is discharged to the outside of the refrigeration cycle and is supplied to the outdoor unit 1. The disproportionation reaction can be prevented by quickly releasing the air using the outdoor fan 5a accommodated. The conditions for breaking the branch pipe 11 are as described in the first embodiment.

<Refrigerant release means shown in FIG. 15>
In the refrigeration cycle apparatus 100D shown in FIG. 15, one end side of the pipe 15 (the end side that is not the end portion on the compressor 3 side) is configured by the branch pipe 11 having a smaller diameter than the liquid pipe 7 and the gas pipe 9. The one end side is located on the suction side of the outdoor fan 5a with the cap 12 closed. And the control apparatus 30 operates the outdoor air blower 5a, when the cap 12 remove | deviated or broke. As described in Embodiment 1, the cap 12 is configured to come off or break at a predetermined pressure or a predetermined temperature. Whether the cap 12 has been removed or broken can be estimated from, for example, measured values of the pressure detector 21 and the temperature detector 22.

As described above, in the refrigeration cycle apparatus 100D shown in FIG. 15, before HFO-1123 undergoes a disproportionation reaction, the refrigerant mainly composed of HFO-1123 is discharged to the outside of the refrigeration cycle and is supplied to the outdoor unit 1. The disproportionation reaction can be prevented by quickly releasing the air using the outdoor fan 5a accommodated. The conditions for removing or breaking the cap 12 are as described in the first embodiment.

<Refrigerating means shown in FIG. 16>
In the refrigeration cycle apparatus 100D shown in FIG. 16, one end side of the pipe 15 (the end side that is not the end portion on the compressor 3 side) is positioned on the suction side of the outdoor fan 5a, and the valve 10 is installed there. A branch pipe 11 having a diameter smaller than that of the liquid pipe 7 and the gas pipe 9 is connected to one end side of the pipe 10 (the end side which is not the end portion on the compressor 3 side) via a flare nut 13. And the control apparatus 30 operates the outdoor air blower 5a, when the branch pipe 11 is destroyed. The valve 10 is controlled to be opened and closed by the control device 30 as described in the first embodiment. As described in the first embodiment, the branch pipe 11 is broken at a predetermined pressure or a predetermined temperature. In addition, you may make it provide the cap 12 shown in FIG.

As described above, in the refrigeration cycle apparatus 100D shown in FIG. 16, before HFO-1123 undergoes a disproportionation reaction, the refrigerant mainly composed of HFO-1123 is discharged to the outside of the refrigeration cycle, and the outdoor unit 1 The disproportionation reaction can be prevented by quickly releasing the air using the outdoor fan 5a accommodated. Further, as described in the first embodiment, even when the valve 10 is opened by mistake, the refrigerant is not opened as long as the branch pipe 11 is not broken, and serviceability is improved. The conditions for opening the valve 10 and the conditions for breaking the branch pipe 11 are as described in the first embodiment. Moreover, the blockage of the pipe 15 after the branch pipe 11 is broken is also as described in the first embodiment.

Embodiment 5 FIG.
FIG. 17 is a schematic configuration diagram showing an example of a refrigerant circuit configuration of a refrigeration cycle apparatus (hereinafter referred to as refrigeration cycle apparatus 100E) according to Embodiment 5 of the present invention. FIG. 18 is a schematic configuration diagram illustrating another example of the refrigerant circuit configuration of the refrigeration cycle apparatus 100E. FIG. 19 is a schematic configuration diagram showing still another example of the refrigerant circuit configuration of the refrigeration cycle apparatus 100E. FIG. 20 is a schematic configuration diagram illustrating still another example of the refrigerant circuit configuration of the refrigeration cycle apparatus 100E. The refrigeration cycle apparatus 100E will be described with reference to FIGS. In the fifth embodiment, differences from the first to fourth embodiments will be mainly described, and the same parts as those in the first to fourth embodiments will be denoted by the same reference numerals and description thereof will be omitted.

The basic configuration of the refrigeration cycle apparatus 100E is the same as that of the refrigeration cycle apparatus 100A according to Embodiment 1. In the first embodiment, the example in which one of the pipes 15 is connected to the shell of the compressor 3 and the other of the pipes 15 is positioned outside the outdoor unit 1 is shown. Is connected to the discharge pipe 3a of the compressor 3, and the other of the pipes 15 is positioned on the suction side of the outdoor fan 5a. The other configuration of the refrigeration cycle apparatus 100E is the same as that of the refrigeration cycle apparatus 100A according to Embodiment 1. The refrigerant used for the refrigeration cycle apparatus 100E is the same as that of the refrigeration cycle apparatus 100A according to the first embodiment.

<Refrigerant release means shown in FIG. 17>
In the refrigeration cycle apparatus 100E shown in FIG. 17, one end side of the pipe 15 (the end side that is not the end part on the discharge pipe 3a side) is positioned on the suction side of the outdoor fan 5a, and the valve 10 is installed there. . The valve 10 is controlled to be opened and closed by the control device 30 as described in the first embodiment.

As described above, in the refrigeration cycle apparatus 100E shown in FIG. 17, before the HFO-1123 undergoes a disproportionation reaction, the refrigerant mainly composed of HFO-1123 is discharged to the outside of the refrigeration cycle, and the outdoor unit 1 The disproportionation reaction can be prevented by quickly releasing the air using the outdoor fan 5a accommodated. The conditions for opening the valve 10 are as described in the first embodiment.

<Refrigerant release means shown in FIG. 18>
In the refrigeration cycle apparatus 100E shown in FIG. 18, one end side of the pipe 15 (the end side which is not the discharge pipe 3a side end) is configured with the branch pipe 11 having a smaller diameter than the liquid pipe 7 and the gas pipe 9. With the one end side closed, the outdoor blower 5a is positioned on the suction side. As described in the first embodiment, the branch pipe 11 is broken at a predetermined pressure or a predetermined temperature.

As described above, in the refrigeration cycle apparatus 100E shown in FIG. 18, before the HFO-1123 undergoes a disproportionation reaction, the refrigerant mainly composed of HFO-1123 is discharged to the outside of the refrigeration cycle, and the outdoor unit 1 The disproportionation reaction can be prevented by quickly releasing the air using the outdoor fan 5a accommodated. The conditions for breaking the branch pipe 11 are as described in the first embodiment.

<Refrigerating means shown in FIG. 19>
In the refrigeration cycle apparatus 100E shown in FIG. 19, one end side of the pipe 15 (the end side that is not the discharge pipe 3a side end) is configured with the branch pipe 11 having a smaller diameter than the liquid pipe 7 and the gas pipe 9. The one end side is located on the suction side of the outdoor fan 5a with the cap 12 closed. As described in Embodiment 1, the cap 12 is configured to come off or break at a predetermined pressure or a predetermined temperature.

As described above, in the refrigeration cycle apparatus 100E shown in FIG. 19, before HFO-1123 undergoes a disproportionation reaction, the refrigerant mainly composed of HFO-1123 is discharged to the outside of the refrigeration cycle, and the outdoor unit 1 The disproportionation reaction can be prevented by quickly releasing the air using the outdoor fan 5a accommodated. The conditions for removing or breaking the cap 12 are as described in the first embodiment.

<Refrigerant release means shown in FIG. 20>
In the refrigeration cycle apparatus 100E shown in FIG. 20, one end side of the pipe 15 (the end side that is not the end part on the discharge pipe 3a side) is positioned on the suction side of the outdoor fan 5a, and the valve 10 is installed there. A branch pipe 11 having a diameter smaller than that of the liquid pipe 7 and the gas pipe 9 is connected to one end side of the pipe 10 (the end part side which is not the discharge pipe 3a side end part) via a flare nut 13. The valve 10 is controlled to be opened and closed by the control device 30 as described in the first embodiment. As described in the first embodiment, the branch pipe 11 is broken at a predetermined pressure or a predetermined temperature. In addition, you may make it provide the cap 12 shown in FIG.

As described above, in the refrigeration cycle apparatus 100E shown in FIG. 20, before HFO-1123 undergoes a disproportionation reaction, the refrigerant mainly composed of HFO-1123 is discharged to the outside of the refrigeration cycle, and the outdoor unit 1 The disproportionation reaction can be prevented by quickly releasing the air using the outdoor fan 5a accommodated. Further, as described in the first embodiment, even when the valve 10 is opened by mistake, the refrigerant is not opened as long as the branch pipe 11 is not broken, and serviceability is improved. The conditions for opening the valve 10 and the conditions for breaking the branch pipe 11 are as described in the first embodiment. Moreover, the blockage of the pipe 15 after the branch pipe 11 is broken is also as described in the first embodiment.

As described above, the refrigeration cycle apparatus according to the present invention has been described in five embodiments. However, the present invention is not limited to these embodiments, and various modifications or changes can be made without departing from the scope and spirit of the present invention. In each embodiment, the case where one pipe 15 is connected has been described as an example, but a plurality of pipes 15 may be connected. For example, in the refrigeration cycle apparatus 100C shown in FIGS. 9 to 12, a pipe 15 may be further connected between the outdoor heat exchanger 5 and the four-way valve 4.

In each embodiment, the case where the pipe 15 is connected has been described as an example, but the gas pipe 9 may be substituted for the pipe 15. Normally, the gas pipe 9 connecting the outdoor unit 1 and the indoor unit 2 is connected via a connection valve composed of a three-way valve or the like. In general, one end of the connection valve is attached with a service port that is used for evacuation (before the refrigerant is supplied to the refrigerant circuit). The gas pipe 9 leading to the service port may be used as a substitute for the pipe 15.

In addition, when a refrigerant mainly composed of HFO-1123 is discharged to the outside of the refrigeration cycle, it is preferable to be able to issue an alarm by at least one of display and sound. If it does in this way, a user can be alert | reported rapidly about the present condition of a refrigerating-cycle apparatus, and safety will improve further. When reporting by display, use a remote control installed corresponding to the indoor unit 2 or a display of a PC or portable information terminal (cell phone, smartphone, etc.) when connected by a network. Good. In the case of issuing a report by voice, it is preferable to report by a buzzer sound or voice by language.

Note that the refrigeration cycle apparatus described in each embodiment is applied to an apparatus equipped with a refrigeration cycle, such as an air conditioner (for example, a refrigeration apparatus, a room air conditioner, a packaged air conditioner, a multi air conditioner for buildings), a heat pump water heater, and the like. Can be used.

1 outdoor unit, 2 indoor unit, 3 compressor, 3a discharge pipe, 4-way valve, 5 outdoor heat exchanger, 5a outdoor fan, 6 electronic expansion valve, 7 liquid pipe, 8 indoor heat exchanger, 8a indoor fan, 9 Gas pipe, 10 valve, 11 branch pipe, 12 cap, 13 flare nut, 15 pipe, 21 pressure detector, 22 temperature detector, 30 control device, 100A refrigeration cycle device, 100B refrigeration cycle device, 100C refrigeration cycle device, 100D Refrigeration cycle equipment, 100E refrigeration cycle equipment.

Claims

A refrigeration cycle apparatus having a refrigerant circuit to which at least a compressor, a first heat exchanger, a decompression mechanism, and a second heat exchanger are connected, and using a refrigerant having a property of causing a disproportionation reaction in the refrigerant circuit as a main component. Because
A refrigeration cycle device that releases refrigerant from the refrigerant circuit when at least one of the pressure and temperature of the refrigerant in the refrigerant circuit approaches at least one of a limit pressure and a limit temperature at which the refrigerant causes a disproportionation reaction.
The compressor, the first heat exchanger, and the pressure reducing mechanism are provided in a heat source machine,
The second heat exchanger is provided in the user side machine,
The heat source machine and the user side machine are connected by a gas pipe and a liquid pipe,
A pipe is connected to a part of the refrigerant circuit, and one end side thereof is arranged outside the heat source unit,
The refrigeration cycle apparatus according to claim 1, wherein the refrigerant is discharged from the refrigerant circuit via the pipe.
The compressor, the first heat exchanger, a blower for supplying air to the first heat exchanger, and the pressure reducing mechanism are provided in a heat source unit,
The second heat exchanger is provided in the user side machine,
The heat source machine and the user side machine are connected by a gas pipe and a liquid pipe,
A pipe is connected to a part of the refrigerant circuit, and one end side thereof is arranged on the suction side of the blower,
The refrigeration cycle apparatus according to claim 1, wherein the refrigerant is discharged from the refrigerant circuit via the pipe.
The refrigeration cycle apparatus according to claim 2, wherein the pipe is connected to a shell of the compressor that is a part of the refrigerant circuit.
The refrigeration cycle apparatus according to claim 2, wherein the pipe is connected to a discharge pipe of the compressor that is a part of the refrigerant circuit.
The refrigeration cycle apparatus according to claim 2, wherein the pipe is connected to the gas pipe that is a part of the refrigerant circuit.
A valve that can be opened and closed is provided at one end of the pipe,
The refrigeration cycle apparatus according to any one of claims 2 to 6, wherein the refrigerant is released from the refrigerant circuit via the pipe by opening the valve.
A branch pipe having a closed end is provided on one end side of the pipe,
The refrigeration cycle apparatus according to any one of claims 2 to 6, wherein the refrigerant is released from the refrigerant circuit via the pipe by breaking the branch pipe.
The refrigeration cycle apparatus according to claim 8, wherein a cap is provided at a tip of the branch pipe to close the tip of the branch pipe.
A valve that can be opened and closed is provided at one end of the pipe,
A branch pipe having a closed end is provided on the valve;
The refrigeration cycle apparatus according to any one of claims 2 to 6, wherein the refrigerant is released from the refrigerant circuit via the pipe by opening the valve and destroying the branch pipe.
A control device for controlling opening and closing of the valve is provided,
The controller is
When any one of the pressure and temperature of the refrigerant discharged from the compressor is 0.9 times the limit pressure causing the disproportionation reaction or 10 ° C lower than the limit temperature causing the disproportionation reaction The refrigeration cycle apparatus according to claim 7 or 10, wherein the valve is opened.
The branch pipe is
When any one of the pressure and temperature of the refrigerant discharged from the compressor is 0.9 times the limit pressure causing the disproportionation reaction or 10 ° C lower than the limit temperature causing the disproportionation reaction The refrigeration cycle apparatus according to claim 8 or 10, wherein the refrigeration cycle apparatus is destroyed.
The cap is
When any one of the pressure and temperature of the refrigerant discharged from the compressor is 0.9 times the limit pressure causing the disproportionation reaction or 10 ° C lower than the limit temperature causing the disproportionation reaction The refrigeration cycle apparatus according to claim 9, wherein the refrigeration cycle apparatus is disconnected or broken.
The refrigeration cycle apparatus according to any one of claims 1 to 13, wherein HFO-1123 is used as the refrigerant having the property of causing the disproportionation reaction.