CN111868447A - Refrigeration cycle device - Google Patents

Abstract

The air conditioner of the present invention has a refrigeration cycle circuit having a compressor (16), an outdoor heat exchanger (15), an expander and an indoor heat exchanger, and an outdoor unit (12) in which a working medium containing 1,1, 2-trifluoroethylene is sealed, wherein the outdoor unit (12) has at least the compressor (16) and the outdoor heat exchanger (15). The outdoor unit (12) is provided with a compressor housing space (123) for housing the compressor (16), and a communication section (129) for communicating the compressor housing space (123) with the outside of the outdoor unit (12).

Description

Refrigeration cycle device

technical field

The present invention relates to a refrigeration cycle apparatus using a working medium containing HFO1123.

Background technique

Generally, in a refrigeration cycle apparatus such as an air conditioner, a compressor, a radiator, a condenser, a pressure reducer such as a capillary or an expansion valve, an evaporator, etc. are connected by piping to constitute a refrigeration cycle circuit. In addition, set the four-way valve as required. Then, in the refrigeration cycle, cooling or heating is performed by circulating a working medium (refrigerant).

As the working medium in the refrigeration cycle device, it is known as Freon (Freon is described as R○○ or R○○○ by the American ASHRAE34 standard. Here, ○○ and ○○○ are numbers. Hereinafter, it is described as R○○ or R○○○ R○○○), halogenated hydrocarbons derived from methane or ethane.

R410A is often used as the working medium for the refrigeration cycle apparatus as described above. However, since the global warming potential (GWP) of the R410A refrigerant is large at 2090, it cannot be said to be satisfactory from the viewpoint of preventing global warming.

Then, from the viewpoint of preventing global warming, as working media with small GWP, for example, HFO1123 (1,1,2-trifluoroethylene) and HFO1132 (1,2-difluoroethylene) have been proposed (for example, refer to patent Document 1 or Patent Document 2).

However, HFO1123 (1,1,2-trifluoroethylene) and HFO1132 (1,2-difluoroethylene) are less stable than conventional working media such as R410A. Moreover, when a radical is produced|generated, it may change into another compound by a disproportionation reaction.

When the disproportionation reaction occurs, the pressure of the working medium rises with the release of a large amount of heat. Therefore, the reliability of the compressor or the refrigeration cycle device may be lowered. Therefore, when HFO1123 or HFO1132 is used as a working medium of a compressor or a refrigeration cycle apparatus, it is necessary to suppress the disproportionation reaction.

The disproportionation reaction occurs when high energy is imparted to the working medium in an atmosphere of excessively high temperature and high pressure.

For example, when an abnormal operating condition occurs, that is, when the blower fan on the condenser side is stopped or the refrigeration cycle is blocked, the discharge pressure (high pressure side of the refrigeration cycle) increases excessively.

When a lock abnormality of the compressor occurs in such a state, and power is continuously supplied to the compressor even in the lock abnormality, the electric power is excessively supplied to the motor of the compressor, and the motor generates abnormal heat. As a result, the insulation of the stator winding constituting the stator of the motor is melted and destroyed, and a phenomenon called interlayer short circuit occurs between the conductor wires of the stator winding. Then, the interlayer short circuit becomes a high energy source and causes a disproportionation reaction.

Furthermore, in the event of a disproportionation reaction, the compressor may be damaged, and the working medium may be discharged as ash.

An object of the present invention is to improve the reliability of a refrigeration cycle apparatus using a working medium containing HFO1123.

prior art literature

Patent Literature

Patent Document 1: International Publication No. 2012/157764

Patent Document 2: International Publication No. 2012/157765

SUMMARY OF THE INVENTION

The present invention has a refrigeration cycle circuit and an outdoor unit, wherein the refrigeration cycle circuit has a compressor, an outdoor heat exchanger, an expander and an indoor heat exchanger, and the refrigeration cycle circuit is sealed containing 1, 1, 2 - A working medium of trifluoroethylene, the outdoor unit has at least a compressor and an outdoor heat exchanger. The outdoor unit is provided with a compressor accommodating space for accommodating the compressor, and a communication portion that communicates the compressor accommodating space with the outside of the outdoor unit.

By adopting such a configuration, if disproportionation reaction occurs in the compressor and the compressor is damaged and the working medium is discharged as ash and diffused into the compressor housing space, the ash is discharged from the communication portion provided in the outdoor unit to The exterior of the outdoor unit. Therefore, ash can be prevented from being rapidly blown out from the gap between the main body case of the outdoor unit and the top plate and the front plate. In addition, since the discharge portion of ash is determined in the communicating portion, the influence of ash can be minimized. Therefore, the influence of the ash on the surroundings can be limited.

Description of drawings

FIG. 1 is a diagram showing a schematic configuration of an air conditioner as a refrigeration cycle apparatus according to Embodiment 1 of the present invention.

FIG. 2 is a diagram showing a cross-sectional structure of the compressor of the air conditioner according to Embodiment 1. FIG.

FIG. 3 is a front view showing the outdoor unit of the air conditioner according to Embodiment 1. FIG.

4 is an exploded perspective view showing the outdoor unit of the air conditioner according to the first embodiment.

FIG. 5 is a plan view showing the outdoor unit of the air conditioner according to Embodiment 1. FIG.

6 is a diagram showing a schematic cross-sectional structure of an outdoor unit of an air conditioner according to Embodiment 2 of the present invention.

7 is a schematic plan view of the outdoor unit of the air conditioner according to the second embodiment.

8 is an explanatory diagram of a pressure relief portion provided in the compressor of the air conditioner according to the second embodiment.

Detailed ways

An air conditioner according to one aspect of the present invention includes a refrigeration cycle, which includes a compressor, an outdoor heat exchanger, an expander, and an indoor heat exchanger, and an outdoor unit, and is sealed in the refrigeration cycle. A working medium containing 1,1,2-trifluoroethylene is used, and the outdoor unit has at least a compressor and an outdoor heat exchanger. The outdoor unit is provided with a compressor accommodating space for accommodating the compressor, and a communication portion that communicates the compressor accommodating space with the outside of the outdoor unit.

By adopting such a configuration, if disproportionation reaction occurs in the compressor and the compressor is damaged and the working medium is discharged as ash and diffused into the compressor housing space, the ash is discharged from the communication portion provided in the outdoor unit to The exterior of the outdoor unit. Therefore, ash can be prevented from being rapidly blown out from the gap between the main body case of the outdoor unit and the top plate and the front plate. In addition, since the discharge portion of ash is determined in the communicating portion, the influence of ash can be minimized. Therefore, the influence of the ash on the surroundings can be limited.

In the air conditioner according to another aspect of the present invention, the compressor housing space may be configured by partitioning the compressor and the outdoor heat exchanger with a partition plate.

By adopting such a configuration, the ash discharged from the compressor is blown out to the space in which the outdoor heat exchanger is accommodated, thereby preventing the outdoor heat exchanger from being contaminated by the ash. Therefore, even when ash is generated, the outdoor heat exchanger can be reused.

In the air conditioner according to another aspect of the present invention, the communication area of the communication portion may be larger than the total area of the gaps formed by the members constituting the compressor housing space facing each other.

By adopting such a configuration, the ash discharged from the compressor to the compressor housing space is blown out from the communication portion to the outside of the outdoor unit. Therefore, ash can be prevented from being rapidly blown out from the gaps formed between the members constituting the compressor housing space facing each other, that is, the gaps between the main body case and the top plate and between the main body case and the front plate of the outdoor unit. Thereby, the influence of ash can be suppressed.

In the air conditioner according to another aspect of the present invention, the communication portion may be provided at a position higher than the lowermost portion of the compressor.

By adopting such a configuration, it is possible to prevent in advance a situation in which the communication portion is blocked by drain water or the like accumulated on the bottom surface of the outdoor unit. Therefore, ashes can be more reliably discharged from the communication portion.

In the air conditioner according to another aspect of the present invention, the communication portion may be provided in the casing of the outdoor unit on the rear side of the outdoor unit.

By adopting such a structure, the place where ash is discharged can be specified at the rear of the outdoor unit. In many cases, the outdoor unit is arranged so that the rear side of the outdoor unit follows the wall surface of the house. Therefore, by discharging the ash from the rear side of the outdoor unit, the influence of the ash on the periphery of the outdoor unit, that is, the front and the side of the outdoor unit can be suppressed.

In the air conditioner according to another aspect of the present invention, the compressor may include a pressure relief portion that reduces the pressure in the compressor by releasing the working medium in the compressor to the outside of the compressor.

By adopting such a structure, even if a disproportionation reaction occurs, extreme damage to the compressor itself can be prevented. Therefore, the safety of the refrigeration cycle apparatus can be improved.

The air conditioner according to another aspect of the present invention may be configured to operate when the pressure in the compressor becomes excessive due to the disproportionation reaction of the working medium.

By adopting such a configuration, when the pressure in the compressor becomes excessive pressure due to the occurrence of the disproportionation reaction, the pressure inside the compressor is lowered by the pressure relief portion. Therefore, the compressor can be prevented from being largely damaged. In addition, it is possible to suppress the rapid progress of the disproportionation reaction, and to suppress the amount of generated ash, that is, the amount of ash discharged from the communication portion to the outside of the outdoor unit.

The air conditioner of another aspect of this invention may be comprised so that a disproportionation inhibitor may be added to a working medium.

By adopting such a configuration, the occurrence of disproportionation reaction can be suppressed, the compressor itself can be prevented from being damaged in advance, and safety can be further improved. In addition, since the rapid progress of the disproportionation reaction can be prevented, the amount of generated ash, that is, the amount of ash discharged from the communication portion to the outside of the outdoor unit is reduced.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Furthermore, the present invention is not limited to this embodiment.

(Embodiment 1)

[1-1. Overall structure]

FIG. 1 is a diagram showing a schematic configuration of an air conditioner as a refrigeration cycle apparatus according to Embodiment 1 of the present invention.

In the present embodiment, the air conditioner 10 will be described as an example of the refrigeration cycle apparatus.

As shown in FIG. 1 , the air conditioner 10 includes an indoor unit 11 and an outdoor unit 12 . Moreover, the air conditioner 10 has the piping 13 which connects the indoor unit 11 and the outdoor unit 12. The indoor unit 11 has an indoor heat exchanger 14 used as an evaporator or a condenser. The outdoor unit 12 has an outdoor heat exchanger 15 used as a condenser or an evaporator, a compressor 16, and an expander 17. The outdoor unit 12 includes a controller 18 that controls the compressor 16 and the like.

The indoor heat exchanger 14 of the indoor unit 11 and the outdoor heat exchanger 15 of the outdoor unit 12 are connected by the piping 13, whereby the refrigeration cycle 30 is constituted. More specifically, the indoor heat exchanger 14 of the indoor unit 11 , the compressor 16 , the outdoor heat exchanger 15 of the outdoor unit 12 , and the expander 17 are connected to each other in an annular shape by the piping 13 in this order.

In addition, a four-way valve 19 is provided in the piping 13 connecting the indoor heat exchanger 14, the compressor 16, and the outdoor heat exchanger 15. By switching the four-way valve 19, cooling and heating can be switched.

In addition, the indoor unit 11 has a ventilation fan, a temperature sensor, an operation part, and the like, but is not shown. The outdoor unit 12 includes a fan, an accumulator, and the like, but is not shown. In addition, the piping 13 is provided with various valve devices, filters, etc., in addition to the four-way valve 19, but is not shown.

In the indoor heat exchanger 14 , heat exchange is performed between the indoor air sucked into the indoor unit 11 by the blower fan and the working medium flowing in the indoor heat exchanger 14 . The indoor unit 11 sends the air heated by the heat exchange into the room during heating, and sends the air cooled by the heat exchange into the room during cooling.

In the outdoor heat exchanger 15 , heat exchange is performed between the outside air sucked into the interior of the outdoor unit 12 by the fan and the working medium flowing inside the outdoor heat exchanger 15 .

[1-2. Compressor]

2 is a diagram showing a cross-sectional structure of a compressor of the air conditioner according to Embodiment 1. FIG.

FIG. 2 shows the compressor 16 for the refrigeration cycle 30 . As shown in FIG. 2 , in the present embodiment, a case where a hermetic rotary compressor is used as the compressor 16 will be described. The casing of the compressor 16 is constituted by an airtight container 161 . Inside the airtight container 161, the electric motor part 162 and the compression mechanism part 163 are accommodated. The interior of the airtight container 161 is filled with high temperature and high pressure working medium and lubricating oil. The bottom of the airtight container 161 is an oil storage portion 164 in which lubricating oil is accumulated.

In the present embodiment, a so-called brushless motor is used as the motor unit 162 . The motor unit 162 includes a rotor 166 connected to the crankshaft 165 of the compression mechanism unit 163 and a stator 167 provided around the rotor 166 .

The rotor 166 is configured by attaching permanent magnets to the rotor core and integrating with the rotor core. Further, the stator 167 is configured by concentratingly winding the stator windings 170 around the stator core with the insulating paper 169 interposed therebetween. The lead wire 171 extends from the stator winding 170 , and the other end of the lead wire 171 is connected to the power supply terminal 172 . The power supply terminal 172 has three terminals, and the three terminals are connected to the inverter-type controller 18 (see FIG. 1 ), respectively. Among them, the stator winding 170 may also be formed by distributed winding.

The controller 18 controls the switching elements to flow current in the stator windings 170 in a manner such that a rotating magnetic field is generated in the rotor 166 . Thereby, electric power supplied from the external power supply 20 (refer to FIG. 1 ) is supplied to the motor unit 162 . The rotation speed of the rotating magnetic field and the like can be changed by the inverter. The compressor 16 can be operated at a high speed, for example, immediately after the compressor 16 starts to operate, and can be operated at a low speed during steady operation, for example.

The compression mechanism part 163 includes a cylinder 174 constituting the compression chamber 173 and a rolling piston 175 arranged in the compression chamber 173 in the cylinder 174 . The rolling piston 175 rotates in the compression chamber 173 while being in contact with a vane (not shown) in accordance with the rotation of the crankshaft 165 , and sucks the working medium from the suction pipe 179 and compresses it.

The working medium compressed in the compression chamber 173 is discharged from the discharge muffler 176 to the discharge working medium space 177 in the airtight container 161 . After that, the working medium is discharged from the discharge pipe 178 to the outside of the compression mechanism portion 163 . In addition, in order to prevent the liquid in the compression chamber 173 from being compressed, a liquid accumulator 180 is provided in the suction pipe 179 .

[1-3. Outdoor unit]

3 , 4 and 5 are a front view, an exploded perspective view, and a plan view showing the outdoor unit of the air conditioner according to Embodiment 1, respectively. Among them, FIG. 5 shows a state in which the top plate 125 of the casing is removed.

As shown in FIG. 3 , the casing constituting the outer casing of the outdoor unit 12 includes a main body casing 121 , a top plate 125 and a front plate 126 arranged on the upper part of the main body casing 121 .

As shown in FIGS. 4 and 5 , a compressor housing space 123 is provided inside the outdoor unit 12 . The compressor housing space 123 is constituted by partitioning the compressor 16 and the outdoor heat exchanger 15 with a partition plate 122 . Specifically, in the present embodiment, the compressor housing space 123 is a space partitioned by the main body casing 121 , the partition plate 122 , the front plate 126 , and the top plate 125 . The compressor 16 is arranged in the compressor housing space 123 .

As shown in FIG. 4, in the upper part of the compressor accommodation space 123, the accommodation chamber 124 which accommodates the controller 18 is provided. The upper part of the storage chamber 124 is covered by the top plate 125 .

In addition, the outdoor heat exchanger 15 and the fan 21 are arranged beside the compressor housing space 123 . The front side of the outdoor heat exchanger 15 and the fan 21 and the front side of the compressor housing space 123 are covered by the front plate 126 .

In addition, the side wall cover 127 is detachably attached to the main body case 121 on the side surface of the main body case 121 forming the compressor housing space 123 .

[1-4. Working medium]

The working medium (refrigerant) is sealed in the refrigeration cycle 30 of the air conditioner 10 .

The working medium of the present embodiment contains at least 1,1,2-trifluoroethylene (HFO1123) as a refrigerant component. 1,1,2-trifluoroethylene has a structure represented by formula (1) shown below. That is, two hydrogen atoms (H) bonded to the monovalent carbon atom (C) of ethylene are substituted with fluorine (F), and two hydrogen atoms (H) bonded to the divalent carbon atom (C) are replaced by fluorine (F). One is substituted to fluorine (F).

[Chemical formula 1]

1,1,2-Trifluoroethylene contains carbon-carbon double bonds. Ozone in the atmosphere generates hydroxyl radicals (OH radicals) through photochemical reactions. The carbon-carbon double bond is easily decomposed by the hydroxyl radical. Therefore, 1,1,2-trifluoroethylene has less effect on ozone depletion and global warming.

However, 1,1,2-trifluoroethylene causes a rapid disproportionation reaction when high energy such as interlayer short circuit is applied under high temperature and high pressure conditions due to its good decomposability as described above. As this disproportionation reaction, a self-decomposition reaction in which the molecules of 1,1,2-trifluoroethylene are decomposed occurs, and following this self-decomposition reaction, a polymerization reaction in which carbon generated by the decomposition is polymerized and becomes ashes, and the like occur.

Therefore, when the inside of the compressor 16 is in a high temperature and high pressure state due to the stop of the blower fan on the condenser side or the blockage of the refrigeration cycle 30, and the compressor 16 is in a locked state, the stator winding 170 is continuously energized, and the stator winding is energized. 170 generates active free radicals when abnormal heat generation occurs, or when the insulation is damaged and an interlayer short circuit occurs. Then, this active radical reacts with 1,1,2-trifluoroethylene, and the aforementioned disproportionation reaction occurs.

Since the disproportionation reaction is accompanied by heat generation, active radicals are generated by the heat generation, and the disproportionation reaction is induced by the active radicals. In this way, the generation of active radicals and the generation of the disproportionation reaction occur in a chain, so that the disproportionation reaction rapidly proceeds, and the pressure in the compressor 16 rapidly rises in about 0.2 seconds. As a result, the compressor 16 may be damaged due to an increase in the pressure in the compressor 16 .

In addition, if the compressor 16 is damaged, the working medium that undergoes a disproportionation reaction in the compressor 16 turns into ash, is discharged and diffused into the compressor storage space 123 where the compressor 16 is stored. Then, as described above, the diffused ash is blown out from the gaps between the components constituting the compressor housing space 123 (for example, between the main body case 121 and the top plate 125 and between the top plate 125 and the front plate 126 ), and is Release to the four directions around the outdoor unit 12 . As a result, there is a possibility that the surrounding structures of the outdoor unit 12 may be polluted widely by the ash. In addition, ashes adhere to the parts of the main body casing 121 , the top plate 125 and the front plate 126 from which the soot is blown out and parts in the vicinity thereof. Therefore, at the time of maintenance such as replacement of the compressor 16 , there is a possibility that the entire casing composed of the main body casing 121 , the top plate 125 , and the front plate 126 needs to be exchanged.

[1-5. Connecting part]

As shown in FIGS. 3 to 5 , in the air conditioner 10 of the present embodiment, a communication portion 129 that communicates the compressor housing space 123 of the outdoor unit 12 and the outside of the outdoor unit 12 is provided. Specifically, as shown in FIG. 4 , the side wall 128 of the main body casing 121 constituting the compressor housing space 123 is provided with an exhaust hole 129 a, and the side wall cover 127 is provided with an exhaust hole 129 b. The exhaust holes 129a and 129b constitute a communication portion 129 for ash discharge.

By adopting such a structure, a disproportionation reaction occurs in the compressor 16, and the working medium in the compressor 16 turns into ash. If the ash is discharged and diffused into the compressor housing space 123, the ash will be as shown in FIG. 5 . As shown by the arrow, the air is discharged from the compressor housing space 123 to a predetermined direction outside the outdoor unit 12 via the communication portion 129 . That is, the dust is discharged to the outdoor unit 12 from the exhaust holes 129a and 129b (refer to FIG. 4 ) provided in the side wall 128 and the side wall cover 127 , which constitute the communication portion 129 at the side of the main body casing 121 of the outdoor unit. outside, i.e. in the atmosphere. Therefore, dust can be prevented from blowing out rapidly from the gaps between the main body case 121 and the top plate 125 of the outdoor unit 12 and between the main body case 121 and the front plate 126 . Therefore, the influence of ash on the surroundings can be minimized.

In addition, in the vicinity of the exhaust hole 129b, for example, an instruction for use, which means that "ash may be released from this place in the event of an abnormality." may be given. Thereby, even if ash is discharged from the communication part 129 by any chance, it is possible to reduce the feeling of anxiety given to the user, and it is possible to prevent the discharged ash from affecting the user.

In addition, since dust can be prevented from blowing out from the gap between the main body case 121 and the top plate 125 and the gap between the main body case 121 and the front plate 126, dust and dirt can be prevented from being generated in the vicinity of these gaps. Therefore, when performing maintenance such as replacement of the compressor 16, it is not necessary to replace the entire casing including the main body casing 121, the top plate 125, and the front plate 126, so that the cost for replacement of parts can be reduced.

Among these, it is preferable that the communication area of the communication part 129 is larger than the total area of the clearance gap formed between the members which comprise the compressor accommodation space 123 so that it may oppose, as mentioned later. In the present embodiment, specifically, the area of each of the exhaust holes 129a and 129b is preferably larger than the area of the gap formed between the main body case 121 and the top plate 125 and the front plate 126 which cover the compressor housing space 123, respectively. The total area. That is, the peripheral space of the compressor 16, that is, preferably, compared with the sum of the areas of the gaps formed to separate and form the compressor housing space 123 (the main body casing 121, the top plate 125, the front plate 126, etc.) facing each other, The area of each of the exhaust holes 129a, 129b is relatively large.

Among them, the total area of the gap formed by the members constituting the compressor housing space 123 facing each other is the opening that communicates the compressor housing space 123 with the outside of the compressor housing space 123 , that is, the communication portion 129 is excluded. part of the open area.

Thereby, even if the ash is diffused into the compressor housing space 123, the ash is smoothly discharged to the outside of the outdoor unit 12 from the communication portion 129 having a large opening area (communication area). Therefore, dust can be more reliably prevented from blowing out from the gap between the main body case 121 and the top plate 125 and the gap between the main body case 121 and the front plate 126 . Thereby, dust fouling of the casing can be prevented.

In addition, it is preferable that a net is provided in the communication part 129, or a net is constituted by a group of a large number of small holes. Thereby, it is possible to prevent pests and the like from invading into the outdoor unit 12 via the communication portion 129 .

In addition, in this embodiment, the communication part 129 is provided in the side part of the outdoor unit 12, but the communication part 129 may be provided in the back surface part of the outdoor unit 12. In this case, the communication portion 129 may be provided on the rear surface of the main body case 121 . Thereby, the place where ash is discharged can be specified at the rear of the outdoor unit. Therefore, even if there is a user or the like in the periphery of the front surface or the side surface of the outdoor unit 12, it is possible to avoid the influence of the dust on the user or the like. That is, the influence of dust can be minimized by arranging the communication portion 129 behind the outdoor unit 12 (on the wall surface side of the house) where there is a high possibility that a user or the like does not exist.

Moreover, it is preferable that the communication part 129 is provided in the uppermost position rather than the lowermost part of the compressor 16. As shown in FIG. At a position lower than the lowermost part of the compressor 16 , for example, when a communication part is provided on the bottom surface of the outdoor unit 12 , the communication part 129 may sink into the drain water or the like accumulated on the bottom surface of the outdoor unit 12 and become blocked. question. However, by disposing the communication portion 129 above the lowermost portion of the compressor 16, the communication portion 129 can be prevented from being blocked. Therefore, the generated ash can be reliably discharged from the communication portion 129 .

(Embodiment 2)

6 is a diagram showing a schematic cross-sectional structure of an outdoor unit of an air conditioner in Embodiment 2. FIG. Fig. 7 is a schematic plan view of the outdoor unit of the air conditioner. FIG. 7 shows a state in which the upper surface portion of the main body case 121 is removed.

8 is an explanatory diagram of a pressure relief unit provided in a compressor of an outdoor unit of the air conditioner. The enlarged view shown in the upper right part of FIG. 8 shows a state in which the connector cover of the power supply terminal 172 is removed.

As shown in FIGS. 6 to 8 , in the present embodiment, the compressor 16 has a pressure relief portion 181 that reduces the pressure in the compressor 16 . Since other structures are the same as those in Embodiment 1, descriptions thereof are omitted.

The pressure relief part 181 reduces the pressure in the compressor 16 by releasing the working medium in the compressor 16 to the outside of the compressor 16 . Further, the pressure relief unit 181 operates when the pressure in the compressor 16 becomes excessively high due to the disproportionation reaction of the working medium.

For example, as shown in FIG. 8 , the pressure relief portion 181 is configured by weakening the strength of the welded portion 182 of the power supply terminal 172 of the compressor 16 . Thereby, when the pressure in the compressor 16 rapidly increases due to the disproportionation reaction of the working medium in the compressor 16, the pressure can be lowered.

When the pressure in the compressor 16 rises and a disproportionation reaction occurs, the pressure in the compressor 16 rises suddenly and becomes an excessively high pressure. That is, the pressure in the compressor 16 suddenly rises to a pressure considerably higher than the pressure that has risen due to the abnormal operating conditions of the compressor 16 . At this time, in the present embodiment, the welded portion of the power supply terminal 172 constituting the pressure relief portion 181 is detached due to a sudden increase in pressure. The pressure in the compressor 16 is released from the welded portion of the power supply terminal 172 . That is, a part of the working medium in the compressor 16 is discharged to the outside of the compressor 16 .

Thereby, the pressure of the working medium in the compressor 16 is momentarily reduced. Therefore, extreme damage to the airtight container itself of the compressor 16 can be prevented, and safety can be improved. In addition, since the pressure in the compressor 16 can be reduced, rapid progress of the disproportionation reaction can be suppressed. Therefore, the amount of ash generated by the disproportionation reaction can be reduced, and the amount of ash discharged from the communication portion 129 can be reduced.

In addition, as shown in FIG. 6, the guide (1st guide) 183 extended toward the communicating part 129 from the vicinity of the pressure relief part 181 of the compressor 16 may be injected|thrown-in. Thereby, the ash discharged from the pressure relief part 181 of the compressor 16 can be guided to the communication part 129 and discharged to the outside of the outdoor unit 12 smoothly. Therefore, dust can be more reliably prevented from blowing out from the gap between the main body case 121 and the top plate 125 and the gap between the main body case 121 and the front plate 126 .

Further, as shown by the broken line in FIG. 6 , a guide (second guide) 184 for discharging dust may be provided outside the casing of the outdoor unit 12 and outside the communicating portion 129 . As shown in FIG. 6 , the guide 184 has, for example, an L-shaped cross section, and guides the dust downward. That is, the guide 184 has, in its cross-sectional shape, a first portion extending from the peripheral edge of the opening of the communication portion 129 to the outside of the housing, and a second portion extending downward from the front end of the first portion. By providing the guide 184, the discharge direction of the ashes can be determined, so that the influence of the discharged ashes can be minimized.

In addition, the structure of the pressure relief part 181 is not limited to the structure mentioned above. For example, the pressure relief portion 181 can be configured by weakening the strength of a portion constituting the compressor 16, such as a welded portion of the discharge pipe 178. In addition, the pressure relief portion 181 may be constituted by separately providing a pressure regulating valve or the like in the compressor 16 .

(Embodiment 3)

In this embodiment, the working medium containing 1,1,2-trifluoroethylene (HFO1123) sealed in the refrigeration cycle 30 is added to suppress the disproportionation reaction of 1,1,2-trifluoroethylene (HFO1123). disproportionation inhibitor.

For example, the disproportionation inhibitor is an ethyl halide having a structure represented by the following formula (2) (except when X is F only).

C ₂ H _m X _n …(2)

Here, X in the formula (2) is a halogen atom selected from F, Cl, Br, and I. Here, in formula (2), m is an integer of 0 or more, and n is an integer of 1 or more. Further, the sum of m and n is 6, and when n is 2 or more, X is the same or different kind of halogen atom.

By adding the above-mentioned disproportionation inhibitor to the refrigerant component containing 1,1,2-trifluoroethylene, the halide represented by the formula (2) can favorably capture the fluorine radicals that cause the chain branching reaction of the disproportionation reaction , fluoromethyl radical and fluoromethylene radical and other radicals.

Therefore, the disproportionation reaction of 1,1,2-trifluoroethylene can be effectively suppressed, and the rapid progress of the disproportionation reaction can be moderated.

Therefore, the damage of the compressor 16 itself can be prevented in advance, the safety can be further improved, and the reliability of the refrigeration cycle apparatus can be improved. In addition, since the rapid progress of the disproportionation reaction can be suppressed, the amount of ash to be generated can be suppressed. Therefore, the discharge amount of ash discharged from the communication portion 129 can be greatly suppressed.

In addition, the disproportionation inhibitor which suppresses the disproportionation reaction of 1,1,2-trifluoroethylene (HFO1123) may be the following substances in addition to the above-mentioned substances.

That is, the disproportionation inhibitor may be composed of a saturated hydrocarbon having 2 to 5 carbon atoms, or a halogenated alkane having 1 or 2 carbon atoms except that all halogen atoms are fluorine.

By adding such a disproportionation inhibitor, saturated hydrocarbons and halogenated alkanes can favorably capture fluorine radicals, fluoromethyl radicals, fluoromethylene radicals, and the like generated in the disproportionation reaction of 1,1,2-trifluoroethylene. free radicals. Therefore, the disproportionation reaction of 1,1,2-trifluoroethylene can be effectively suppressed, and the rapid progress of the disproportionation reaction can be moderated. In addition, the inhibition of the disproportionation reaction or the relaxation of the progress of the disproportionation reaction can be achieved with a smaller addition amount than the case where the saturated hydrocarbon alone or the halogenated alkane alone is used as the disproportionation inhibitor. As a result, the reliability of the working medium and the refrigeration cycle apparatus using the same can be improved.

(Embodiment 4)

In the present embodiment, the refrigeration cycle apparatus includes a detection unit that detects that ash is discharged from the compressor 16 .

For example, a detection unit for detecting discharge of ash generated by the working medium is provided in the compressor housing space 123 . The detection unit may be, for example, a temperature sensor. Then, when the temperature in the compressor housing space 123 is equal to or higher than a predetermined temperature, the temperature sensor displays the temperature on the indoor unit side.

By adopting such a configuration, when the air conditioner 10 is stopped due to an abnormality, the user can be informed that the cause of the abnormal stop is caused by a disproportionation reaction. Therefore, since the cause of the abnormal stop is clearly indicated, the user can take appropriate measures.

In the above, the refrigeration cycle apparatus of the present invention has been described by taking the air conditioner 10 as an example, but the refrigeration cycle apparatus is not limited to this. As a refrigeration cycle apparatus, the components, such as a compressor, a condenser, an expansion mechanism, and an evaporator, are connected by piping, and what is necessary is just a structure which has an outdoor unit. Moreover, the specific application example of this invention is not specifically limited, For example, a heat pump water heater etc. may be sufficient.

In addition, in this Embodiment, the compressor 16 was demonstrated using a rotary compressor as an example. However, the structure of the compressor 16 is not limited to this, and may be any other compression type, for example, a scroll type, a reciprocating type constant displacement compressor, or a centrifugal compressor or the like.

industrial availability

In the present invention, the influence of the generated ash can be minimized even in the event of a disproportionation reaction, so that the reliability of the refrigeration cycle apparatus using the working medium containing HFO1123 can be improved. Therefore, it can be widely used in various air conditioners, heat pump water heaters, and the like for residential and commercial use.

Description of reference numerals

10 Air conditioner (refrigeration cycle device)

11 Indoor unit

12 Outdoor unit

13 Piping

14 Indoor heat exchanger

15 Outdoor heat exchanger

16 Compressor

17 Expander

18 Controller

19 Four-way valve

20 External power supply

21 Fan

30 Refrigeration circuit

121 Main body shell

122 Divider

123 Compressor storage space

124 Storage Room

125 top plate

126 Front plate

127 Side wall cover

128 side wall

129 Connecting part

129a, 129b Exhaust holes

161 Airtight containers

162 Motor Department

163 Compression Mechanism Department

164 Oil Reservoir

165 Crankshaft

166 rotors

167 Stator

169 insulating paper

170 Stator winding

171 Leads

172 Power supply terminal

173 Compression chamber

174 cylinders

175 Rolling Piston

176 Exhaust silencer

177 Draining the working medium space

178 Discharge pipe

179 Suction pipe

180 Reservoir

181 Pressure Relief Section

182 Welding part

183 Guide (1st guide)

184 Guide (2nd guide).

Claims (8)

1. A refrigeration cycle apparatus, characterized in that:

comprises a refrigeration circulation loop which is provided with a compressor, an outdoor heat exchanger, an expander and an indoor heat exchanger, and working medium containing 1,1, 2-trifluoroethylene is sealed in the refrigeration circulation loop; and

an outdoor unit having at least the compressor and the outdoor heat exchanger,

The outdoor unit is provided with a compressor housing space for housing the compressor and a communication portion for communicating the compressor housing space with an outside of the outdoor unit.

2. The refrigeration cycle apparatus according to claim 1, wherein:

the compressor housing space is configured by partitioning the compressor and the outdoor heat exchanger by a partition plate.

3. The refrigeration cycle apparatus according to claim 1 or 2, wherein:

the communication area of the communication portion is larger than the total area of gaps formed by the members constituting the compressor housing space facing each other.

4. A refrigeration cycle apparatus according to any one of claims 1 to 3, wherein:

the communicating portion is provided above a lowermost portion of the compressor.

5. The refrigeration cycle apparatus according to any one of claims 1 to 4, wherein:

the communication portion is provided on a rear surface side of the outdoor unit in a casing of the outdoor unit.

6. The refrigeration cycle apparatus according to any one of claims 1 to 5, wherein:

the compressor has a relief portion that reduces a pressure within the compressor by releasing the working medium within the compressor to an exterior of the compressor.

7. The refrigeration cycle apparatus according to claim 6, wherein:

the relief portion operates when the pressure in the compressor becomes excessive due to occurrence of a disproportionation reaction of the working medium.

8. The refrigeration cycle apparatus according to any one of claims 1 to 7, wherein:

a disproportionation inhibitor is added to the working medium.

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