JP2021060194A - Refrigeration device - Google Patents

Abstract

To provide a refrigeration device that can improve safety by suppressing clogging of a polymer that is generated by polymerization reaction of refrigerant.SOLUTION: A refrigeration device includes a refrigeration cycle in which a compressor, a condenser, an expansion mechanism and an evaporator are annularly connected. The refrigeration device includes a polymer catcher. The polymer catcher is fitted to piping for connecting an outlet side of the compressor to an inlet side of the condenser to catch a polymer of refrigerant circulating through the refrigeration cycle. The refrigerant includes a chemical compound represented by a molecular formula including one or more carbon-carbon unsaturated bonds.SELECTED DRAWING: Figure 1

Description

Regarding refrigeration equipment.

In recent years, hydrofluoroolefins (HFOs) have been used as refrigerants in refrigerating devices such as air conditioners, as disclosed in Patent Document 1 (Japanese Unexamined Patent Publication No. 2015-007257). HFOs are, for example, 1,1,2-trifluoroethylene (HFO-1123) and 2,3,3,3-tetrafluoropropene (HFO-1234yf). HFO has a small global warming potential because it is easily decomposed by OH radicals in the atmosphere.

However, some HFOs have low thermal stability and are prone to disproportionation reactions. The disproportionation reaction is a chemical reaction in which two or more molecules of the same type react with each other to produce two or more different types of substances. When the refrigerant is a compound represented by a molecular formula having one or more carbon-carbon unsaturated bonds such as HFO-1123, the polymerization reaction, which is a kind of disproportionation reaction, easily proceeds under high temperature and high pressure. The polymerization reaction is a reaction in which a compound having a large molecular weight (polymer compound) is produced by polymerizing a plurality of monomers. A polymer, which is a compound produced by a polymerization reaction, usually has a molecular weight of 10,000 or more.

In the refrigerating apparatus, the polymerization reaction of the refrigerant tends to proceed inside the compression mechanism of the compressor. If the polymer produced by the polymerization reaction of the refrigerant adheres to the piping of the refrigerating apparatus or the like, the refrigerant flow path may be clogged with the polymer. If the piping of the refrigerating device is clogged with polymer, there is a risk of explosion due to high temperature and high pressure in the vicinity of the clogged part.

An object of the present disclosure is to provide a highly safe refrigerating apparatus by suppressing clogging of a polymer produced by a polymerization reaction of a refrigerant.

The refrigerating apparatus according to the first aspect of the present disclosure includes a refrigerating cycle in which a compressor, a condenser, an expansion mechanism, and an evaporator are connected in a ring shape. This refrigeration system includes a polymer catcher. The polymer catcher is attached to a pipe connecting the outlet side of the compressor and the inlet side of the condenser to catch the polymer of the refrigerant circulating in the refrigeration cycle. The refrigerant contains a compound represented by a molecular formula having one or more carbon-carbon unsaturated bonds.

The refrigerating apparatus according to the first aspect includes a polymer catcher for capturing a polymer produced by a polymerization reaction of refrigerant molecules circulating in a refrigerating cycle. In the compressor of the refrigerating device, the polymerization reaction of the refrigerant molecules tends to proceed due to high temperature and high pressure. Therefore, by providing a polymer catcher between the compressor and the condenser of the refrigeration cycle, the produced polymer is efficiently captured. Therefore, the refrigerating apparatus according to the first aspect can suppress clogging of the polymer produced by the polymerization reaction of the refrigerant and improve safety.

The refrigerating apparatus according to the second aspect of the present disclosure is the refrigerating apparatus according to the first aspect, and further includes a four-way switching valve. The four-way switching valve is attached to the pipe. The polymer catcher is installed between the outlet side of the compressor and the inlet side of the four-way switching valve.

The refrigerating device according to the second aspect includes a four-way switching valve. The four-way switching valve has a sliding portion in which the polymer produced by the polymerization reaction of the refrigerant molecules is easily clogged. Therefore, when the refrigerating apparatus is provided with a four-way switching valve, clogging of the polymer can be effectively suppressed by providing a polymer catcher between the compressor and the four-way switching valve. Therefore, the refrigerating apparatus according to the second aspect can suppress clogging of the polymer produced by the polymerization reaction of the refrigerant and improve safety.

The refrigerating apparatus according to the third aspect of the present disclosure is the refrigerating apparatus according to the first aspect or the second aspect, and the polymer catcher is a filter that suppresses the passage of the polymer.

The refrigerating apparatus according to the third aspect includes a filter that is a polymer catcher for physically capturing the polymer.

The refrigerating apparatus according to the fourth aspect of the present disclosure is a refrigerating apparatus according to any one of the first to third aspects, and the polymer catcher is a dryer having an adsorbent that adsorbs the polymer.

The refrigerating apparatus according to the fourth aspect includes a dryer which is a polymer catcher for chemically trapping the polymer.

The refrigerating apparatus according to the fifth aspect of the present disclosure is the refrigerating apparatus according to the fourth aspect, and the dryer further has a stabilizer and an antioxidant.

The refrigerating apparatus according to the fifth aspect includes a dryer having a stabilizer and an antioxidant. The stabilizer is an oxygen scavenger or the like. Stabilizers and antioxidants suppress the acceleration of the polymerization reaction by oxygen. Therefore, the refrigerating apparatus according to the fifth aspect can suppress clogging of the polymer produced by the polymerization reaction of the refrigerant and improve safety.

The refrigerating apparatus according to the sixth aspect of the present disclosure is the refrigerating apparatus according to any one of the first to fifth aspects, and the condenser has a flat multi-hole tube through which a refrigerant flows.

The refrigerating apparatus according to the sixth aspect can prevent the polymer produced by the polymerization reaction of the refrigerant from being clogged in the flat multi-hole pipe, and can improve the safety.

It is a refrigerant circuit diagram of the air conditioner which concerns on embodiment of this disclosure. It is sectional drawing of the capture mechanism. It is a refrigerant circuit diagram of the air conditioner which concerns on modification A. It is sectional drawing of the trapping mechanism which concerns on modification B.

(1) Configuration of Air Conditioning Device The air conditioning device 1 as a refrigerating device according to the embodiment of the present disclosure will be described. FIG. 1 is a refrigerant circuit diagram of the air conditioner 1. The air conditioner 1 includes a refrigeration cycle in which a compressor 2, a capture mechanism 7, an outdoor heat exchanger 4, an expansion mechanism 5, and an indoor heat exchanger 6 are connected in an annular shape. The air conditioner 1 is a dedicated cooling device capable of performing only cooling operation. In FIG. 1, the solid arrow indicates the flow direction of the refrigerant circulating in the refrigeration cycle during the operation of the air conditioner 1.

The refrigeration cycle of the air conditioner 1 that performs the cooling operation will be described. First, the compressor 2 compresses the low-pressure gas refrigerant and discharges the high-pressure gas refrigerant. The compressed refrigerant discharged from the compressor 2 passes through the capture mechanism 7. The capture mechanism 7 captures the polymer mixed in the compressed refrigerant. Details of the polymer will be described later. The compressed refrigerant that has passed through the capture mechanism 7 is supplied to the outdoor heat exchanger 4. The outdoor heat exchanger 4 condenses a high-pressure gas refrigerant and discharges a high-pressure liquid refrigerant. The outdoor heat exchanger 4 is, for example, a heat exchanger having a flat multi-hole tube. The refrigerant discharged from the outdoor heat exchanger 4 passes through the expansion mechanism 5 and becomes a low-pressure gas-liquid mixed state refrigerant. The expansion mechanism 5 is, for example, a capillary tube. The refrigerant that has passed through the expansion mechanism 5 is supplied to the indoor heat exchanger 6. The indoor heat exchanger 6 evaporates the low-pressure gas-liquid mixed refrigerant and discharges the low-pressure gas refrigerant. The refrigerant discharged from the indoor heat exchanger 6 is supplied to the compressor 2.

The air conditioner 1 is a dedicated cooling device, the outdoor heat exchanger 4 functions as a condenser, and the indoor heat exchanger 6 functions as an evaporator. Therefore, the room is cooled by the latent heat of vaporization of the refrigerant generated in the room heat exchanger 6.

Refrigerating machine oil is sealed in the refrigerating cycle of the air conditioner 1. The refrigerating machine oil is mainly a lubricating oil used for preventing wear and seizure in the sliding portion of the compressor 2. When the compressor 2 is a scroll compressor, the sliding portion of the compressor 2 is, for example, a thrust sliding surface between two scrolls, a sliding surface between a crankshaft and a bearing, and the like.

The refrigerant circulating in the refrigerant circuit of the air conditioner 1 contains a compound represented by a molecular formula having one or more carbon-carbon unsaturated bonds. For example, hydrofluoroolefin (HFO) is used as the refrigerant. HFOs are, for example, 1,1,2-trifluoroethylene (HFO-1123) and 2,3,3,3-tetrafluoropropene (HFO-1234yf and HFO-1234ze (E), etc.). HFO has a small global warming potential because it is easily decomposed by OH radicals in the atmosphere.

Further, the refrigerant used in the air conditioner 1 may be a mixed refrigerant. In that case, the mixed refrigerant contains a compound represented by a molecular formula having one or more carbon-carbon unsaturated bonds. For example, the refrigerant used in the air conditioner 1 may be a mixed refrigerant containing HFC and HFO. Specifically, the mixed refrigerant may _{contain R32 represented by the molecular formula CH 2} F ₂ as an HFC, and may contain HFO-1234yf, HFO-1234ze (E) and the like as an HFO. Since HFCs do not contain chlorine, they are less effective in depleting the ozone layer than chlorofluorocarbons and hydrochlorofluorocarbons.

(2) Configuration of capture mechanism In the air conditioner 1, the capture mechanism 7 is attached to the piping between the discharge port (outlet side) of the compressor 2 and the inflow port (inlet side) of the outdoor heat exchanger 4. Has been done. The capture mechanism 7 has a configuration in which the refrigerant compressed by the compressor 2 passes through the inside. The capture mechanism 7 preferably has a structure that allows the air conditioner 1 to be easily attached to the pipe and removed from the air conditioner 1. In this case, the capture mechanism 7 can be easily replaced.

FIG. 2 is a cross-sectional view of an example of the capturing mechanism 7. The capture mechanism 7 mainly has a main body portion 11 and a filter portion 12. The main body 11 is a tubular member having a portion having a diameter larger than that of the pipes of the air conditioner 1 (the pipes before and after the capture mechanism 7). The filter portion 12 is a porous member fixed to the inner peripheral surface of the main body portion 11. The filter unit 12 is a member that captures the polymer produced by the polymerization reaction of the molecules of the refrigerant. The refrigerant passing through the inside of the capture mechanism 7 passes through the filter unit 12. At that time, the polymer mixed with the refrigerant is captured by the filter unit 12.

The filter unit 12 is composed of, for example, a metal mesh 13 formed of SUS or the like. The mesh 13 is a network member to which a polymer that passes through the inside of the trapping mechanism 7 together with the refrigerant physically adheres. The wire diameter and mesh of the mesh 13 are arbitrary. The wire diameter of the mesh 13 is the thickness of the wire constituting the mesh 13. The mesh of the mesh 13 is the inner dimension of the hole of the mesh 13. When the mesh 13 is a plain weave (a structure in which lines are woven in a grid pattern), the mesh is equal to the length of one side of the square holes of the mesh 13. A mesh of mesh 13 of about several mm is sufficient. However, when the mesh of the mesh 13 is 1 mm or less, the mesh is easily blocked by the polymer. If the mesh of the mesh 13 is blocked with the polymer, the trapping mechanism 7 may be clogged with the polymer, and the refrigerant may not be able to smoothly pass through the trapping mechanism 7, which lowers the operating efficiency and safety of the air conditioner 1. Further, if the mesh of the mesh 13 is too large, it becomes difficult for the polymer to come into contact with the mesh 13, and the trapping performance of the polymer deteriorates. Therefore, it is preferable that the mesh of the mesh 13 is large enough not to be easily closed by the polymer and small enough to appropriately capture the polymer.

In the capturing mechanism 7, the number of meshes 13 of the filter unit 12 is arbitrary. For example, as shown in FIG. 2, a plurality of meshes 13 may be attached to the inside of the main body 11 at predetermined intervals. Further, when the filter unit 12 has a plurality of meshes 13, each mesh 13 may have a wire diameter and a mesh different from each other. For example, the mesh of the mesh 13 may gradually become smaller from the upstream side to the downstream side of the capture mechanism 7.

(3) Composition of refrigerating machine oil Next, the composition of the refrigerating machine oil sealed in the refrigerating cycle will be described. Refrigerating machine oils mainly consist of base oils, acid scavengers, extreme pressure agents and antioxidants.

Mineral oil or synthetic oil is used as the base oil. As the base oil, one having good compatibility with the refrigerant used in the air conditioner 1 is appropriately selected. The mineral oil is, for example, a naphthenic mineral oil or a paraffinic mineral oil. Synthetic oils are, for example, ester compounds, ether compounds, polyα-olefins, alkylbenzenes. Specific examples of the synthetic oil include polyvinyl ether, polyol ester, polyalkylene glycol and the like. As the base oil, a mixture of two or more of the above mineral oils or synthetic oils may be used.

The acid scavenger is an additive used to suppress the deterioration of refrigerating machine oil due to the acid by reacting with an acid such as hydrofluoric acid generated by the decomposition of the refrigerant. The acid scavenger is, for example, an epoxy compound, a carbodiimide compound, or a tempen compound. Specific examples of the acid scavenger include 2-ethylhexyl glycidyl ether, phenyl glycidyl ether, epoxidized cyclohexylcarbinol, di (alkylphenyl) carbodiimide, β-pinene and the like. Acids such as hydrofluoric acid generated by the decomposition of the refrigerant are captured by the acid scavenger contained in the refrigerating machine oil. As a result, deterioration of the refrigerating machine oil due to the acid generated by the decomposition of the refrigerant and corrosion of the metal parts of the air conditioner 1 are suppressed.

The extreme pressure agent is an additive used to prevent wear and seizure in the sliding portion of the compressor 2. Refrigerating machine oil prevents contact between sliding members by forming an oil film between the surfaces of the members that slide with each other in the sliding portion. However, when low-viscosity refrigerating machine oil such as polyvinyl ether is used, and when the pressure applied to the sliding members is high, the sliding members tend to come into contact with each other. Extreme pressure agents suppress the occurrence of wear and seizure by reacting with the surfaces of members that slide with each other in the sliding portion to form a film. Extreme pressure agents are, for example, phosphate esters, phosphite esters, thiophosphates, sulfide esters, sulfides, thiobisphenols and the like. Specific examples of extreme pressure agents include tricresyl phosphate (TCP), triphenylphosphine (TPP), triphenylphosphorothioate (TPPT), amines, C11-14 side chain alkyl, monohexyl and dihexyl phosphate. TCP adsorbs to the surface of the sliding member and decomposes to form a phosphate film.

Antioxidants are additives used to prevent the oxidation of refrigerating machine oil. Specific examples of antioxidants include zinc dithiophosphate, organic sulfur compounds, 2,6-di-tert-butyl-4-methylphenol, 2,6-di-tert-butyl-4-ethylphenol, 2,2. Phenolic antioxidants such as'-methylenebis (4-methyl-6-tert-butylphenol), amine-based antioxidants such as phenyl-α-naphthylamine, N, N'-di-phenyl-p-phenylenediamine, N, N '-Disalicylidene-1,2-diaminopropane and the like can be mentioned.

(4) Features The air conditioner 1 includes a trapping mechanism 7 for capturing a polymer produced by a polymerization reaction of refrigerant molecules. The compressor 2 of the air conditioner 1 is a component in which the polymerization reaction of the refrigerant molecules easily proceeds because the inside becomes high temperature and high pressure. The polymer produced by the polymerization reaction of the refrigerant molecules is a solid, and if it adheres to the piping of the refrigeration cycle or the like, the refrigerant flow path may be clogged with the polymer. If the refrigerant flow path of the air conditioner 1 is clogged with the polymer, the flow of the refrigerant in the refrigeration cycle is obstructed, and the refrigerant may be compressed on the upstream side of the portion clogged with the polymer. As a result, part of the refrigeration cycle becomes hot and high pressure and there is a risk of explosion. Further, when the polymer generated by the polymerization reaction of the refrigerant is bitten into the sliding portion of the air conditioner 1 (compression mechanism of the compressor 2 or the like), the sliding portion is damaged and the air conditioner 1 is damaged. There is a risk of reduced safety and performance. Therefore, if the air conditioner 1 is operated for a long period of time, the operating efficiency and safety of the air conditioner 1 may be lowered due to the polymer produced by the polymerization reaction of the refrigerant molecules. In particular, when the refrigerant is a compound represented by a molecular formula having one or more carbon-carbon unsaturated bonds such as HFO-1123, the polymerization reaction due to heat easily proceeds, so that the weight generated by the polymerization reaction of the refrigerant is generated. Problems caused by coalescence are likely to occur.

In the air conditioner 1, a capture mechanism 7 is attached to a pipe between the compressor 2 of the refrigeration cycle and the outdoor heat exchanger 4. The capture mechanism 7 includes a filter unit 12 that captures the polymer mixed with the refrigerant passing through the inside. The filter unit 12 is composed of a plurality of meshes 13. The polymer that passes through the capture mechanism 7 physically adheres to the mesh 13. As a result, the refrigerant passes through the trapping mechanism 7, and the polymer produced by the polymerization reaction of the refrigerant is captured and removed by the trapping mechanism 7. As a result, it is possible to prevent the refrigerant flow path of the air conditioner 1 from being clogged with the polymer and the sliding portion from being caught in the sliding portion of the air conditioner 1. Further, since the mesh 13 is a mesh member that hardly obstructs the flow of the refrigerant, the amount of the refrigerant flowing into the outdoor heat exchanger 4 is not significantly reduced by the capture mechanism 7. Therefore, the capture mechanism 7 does not significantly reduce the operating efficiency of the air conditioner 1.

Therefore, the air conditioner 1 can improve safety by suppressing clogging of the polymer produced by the polymerization reaction of the refrigerant without lowering the operating efficiency.

Further, the capture mechanism 7 is attached to a pipe between the compressor 2 and the outdoor heat exchanger 4. Therefore, the capture mechanism 7 can have a structure that allows the air conditioner 1 to be easily attached to the pipe and removed from the air conditioner 1. In this case, since the capture mechanism 7 can be easily replaced, maintenance work such as inspection and repair of the air conditioner 1 can be efficiently performed.

When the outdoor heat exchanger 4 is a heat exchanger having a flat multi-hole pipe, the flat multi-hole pipe tends to be clogged with a polymer because the diameter of the flow path through which the refrigerant flows is small. Therefore, in order to prevent the flat multi-hole pipe from being clogged with the polymer, the polymer is captured before the flow of the refrigerant mixed with the polymer flows into the flat multi-hole pipe of the outdoor heat exchanger 4. This is very important. The air conditioner 1 can improve the safety by suppressing the polymer from being clogged in the flat multi-hole pipe by the trapping mechanism 7 attached between the compressor 2 and the outdoor heat exchanger 4.

(5) Modifications Although the embodiments of the present disclosure have been described above, the specific configuration of the present disclosure can be changed without departing from the gist of the present disclosure. Hereinafter, modifications applicable to the embodiments of the present disclosure will be described.

(5-1) Modification A
In the embodiment, the air conditioner 1 is a dedicated cooling device. However, the air conditioner 1 may be a device having both a cooling function and a heating function. FIG. 3 is a refrigerant circuit diagram of the air conditioner 1 in this modification. The air conditioner 1 is mainly composed of a compressor 2, a trapping mechanism 7, a four-way switching valve 3, an outdoor heat exchanger 4, an expansion mechanism 5, and an indoor heat exchanger 6. In FIG. 3, the solid arrow represents the flow of the refrigerant during the cooling operation, and the dotted arrow represents the flow of the refrigerant during the heating operation.

During the cooling operation, the outdoor heat exchanger 4 functions as a condenser, and the indoor heat exchanger 6 functions as an evaporator. In other words, the room is cooled by the latent heat of vaporization of the refrigerant generated in the room heat exchanger 6. On the other hand, during the heating operation, the outdoor heat exchanger 4 functions as an evaporator and the indoor heat exchanger 6 functions as a condenser by switching the four-way switching valve 3. In other words, the room is heated by the latent heat of condensation of the refrigerant generated in the outdoor heat exchanger 4.

In this modification, the capture mechanism 7 is attached to the pipe between the discharge port (outlet side) of the compressor 2 and the inflow port (inlet side) of the four-way switching valve 3. The capture mechanism 7 is the same as that of the embodiment. The four-way switching valve 3 has a sliding portion in which a polymer generated by a polymerization reaction of refrigerant molecules is easily bitten and clogged. If the polymer is clogged in the four-way switching valve 3, the four-way switching valve 3 may not be switched normally, and the sliding portion of the four-way switching valve 3 may be damaged. Therefore, when the air conditioner 1 is provided with the four-way switching valve 3, the capture mechanism 7 is attached to the pipe between the compressor 2 and the four-way switching valve 3 to prevent the polymer from entering the four-way switching valve 3. Will be done. As a result, clogging of the polymer in the four-way switching valve 3 is effectively suppressed. Therefore, the air conditioner 1 of the present modification can suppress the clogging of the polymer produced by the polymerization reaction of the refrigerant and improve the safety.

(5-2) Modification B
In the embodiment, the filter portion 12 of the capture mechanism 7 is composed of the mesh 13. However, the filter unit 12 may include a porous member other than the mesh 13. For example, the filter unit 12 may include a fibrous filter.

FIG. 4 is a cross-sectional view of an example of the capturing mechanism 17 according to this modified example. The capture mechanism 17 mainly has a main body portion 21 and a filter portion 22. As shown in FIG. 4, the filter unit 22 has a pair of meshes 23 and a fibrous filter 24. The pair of meshes 23 are fixed to the main body 21. The fibrous filter 24 is sandwiched and supported from both sides by a pair of meshes 23.

The material of the fibrous filter is arbitrary. For example, the material of the fibrous filter is resin such as polypropylene, polyethylene, polyethylene terephthalate and nylon, metal wool such as copper, and glass wool. In particular, glass wool has high polymer trapping performance and is suitable as a material for fibrous filters.

(5-3) Modification C
In the embodiment, the filter portion 12 of the capture mechanism 7 is composed of the mesh 13. However, punching metal may be used instead of the mesh 13. Punching metal is a member in which a large number of holes are formed in a thin metal plate. The pore size of the punching metal is arbitrary, but it is preferably large enough not to be easily blocked by the polymer and small enough to appropriately capture the polymer.

(5-4) Modification D
In the embodiment, the capture mechanism 7 includes a filter unit 12 that physically captures the polymer contained in the refrigerant. However, the capture mechanism 7 may include a dryer that chemically captures the polymer contained in the refrigerant. For example, the capture mechanism 7 may be an adsorption type dryer. In this case, the capture mechanism 7 has an adsorbent that adsorbs the polymer inside. The polymer mixed in the refrigerant passing through the capture mechanism 7 is adsorbed by the adsorbent and captured.

Further, in this modification, when the trapping mechanism 7 is an adsorption type dryer, the trapping mechanism 7 may further have a stabilizer and an antioxidant in addition to the adsorbent. The stabilizer is an oxygen scavenger or the like. Stabilizers and antioxidants suppress the acceleration of the polymerization reaction of the refrigerant molecules. Therefore, since the capture mechanism 7 can suppress the formation of the polymer due to the polymerization reaction of the refrigerant, the clogging of the polymer can be suppressed more effectively.

Further, when the adsorbent is exposed to a high temperature refrigerant gas, the adsorbent may be altered or decomposed, and the adsorbing ability of the polymer may be lowered. Further, the stabilizer and the antioxidant may be deteriorated or decomposed when exposed to a high temperature refrigerant gas, and the effect of suppressing the polymerization reaction may be reduced. However, the capture mechanism 7 is attached to the pipe between the compressor 2 and the outdoor heat exchanger 4. Therefore, the high-temperature refrigerant gas immediately after being compressed by the compressor 2 does not pass through the capture mechanism 7. In other words, the cooling refrigerant gas that is discharged from the compressor 2 and flows through the pipe passes through the capture mechanism 7. Therefore, by attaching the trapping mechanism 7 to the pipe between the compressor 2 and the outdoor heat exchanger 4, it is possible to prevent the occurrence of a problem that the effect of suppressing the clogging of the polymer is reduced due to the high temperature refrigerant gas. To.

Further, it is preferable that a stabilizer and an antioxidant are provided inside the trapping mechanism 7 on the upstream side (closer to the compressor 2) than the adsorbent. In other words, it is preferable that the refrigerant gas first contacts the stabilizer and the antioxidant inside the trapping mechanism 7, and then contacts the adsorbent. Since the stabilizer and the antioxidant have an effect of suppressing the formation of the polymer, the amount of the polymer in contact with the adsorbent is reduced by the above configuration. Therefore, the life of the trapping mechanism 7 is extended because the decrease in the adsorption capacity of the adsorbent due to the adsorption of the polymer is suppressed.

Further, in this modification, in addition to the trapping mechanism 7 which has only an adsorbent and functions as a dryer, a polymerization suppressing mechanism which has a stabilizer and an antioxidant inside is a compressor 2 and an outdoor heat exchanger 4. It may be attached to the piping between them. In this case, the capture mechanism 7 and the polymerization suppression mechanism are independent members. Therefore, during the maintenance work of the air conditioner 1, only the capture mechanism 7 can be replaced, and only the polymerization suppression mechanism can be replaced.

(5-5) Modification E
In the modification A, the air conditioner 1 includes a four-way switching valve 3. However, the air conditioner 1 may include a bridge circuit instead of the four-way switching valve 3. Since the four-way switching valve 3 has a sliding portion, the frictional heat in the sliding portion may accelerate the polymerization reaction of the refrigerant molecules. Therefore, by adopting a bridge circuit having no sliding portion in the air conditioner 1 instead of the four-way switching valve 3, the formation of the polymer due to the polymerization reaction of the refrigerant is suppressed, and the clogging of the polymer is more effective. Is suppressed.

(5-6) Modification F
In the embodiment, the expansion mechanism 5 of the air conditioner 1 is, for example, a capillary tube. However, the expansion mechanism 5 may be an electric valve instead of a capillary tube. Since the inner diameter of the capillary tube is small, the polymer may be easily clogged. Therefore, by adopting an electric valve having a larger refrigerant flow path area instead of the capillary tube, clogging of the polymer can be suppressed more effectively.
―Conclusion―
Although the embodiments of the present disclosure have been described above, it will be understood that various modifications of the forms and details are possible without departing from the purpose and scope of the present disclosure described in the claims. ..

1 Air conditioner (refrigerator)
2 Compressor 4 Outdoor heat exchanger (condenser, evaporator)
5 Expansion mechanism 6 Indoor heat exchanger (evaporator, condenser)
7 Capture mechanism (polymer catcher)

JP 2015-007257

Claims (6)

A refrigerating device equipped with a refrigerating cycle in which a compressor, a condenser, an expansion mechanism, and an evaporator are connected in a ring shape.
It is attached to a pipe connecting the outlet side of the compressor and the inlet side of the condenser, and is provided with a polymer catcher for catching a polymer of a refrigerant circulating in the refrigeration cycle.
The refrigerant contains a compound represented by a molecular formula having one or more carbon-carbon unsaturated bonds.
Refrigerator. Further equipped with a four-way switching valve attached to the pipe,
The polymer catcher is attached between the outlet side of the compressor and the inlet side of the four-way switching valve.
The refrigerating apparatus according to claim 1. The polymer catcher is a filter that suppresses the passage of the polymer.
The refrigerating apparatus according to claim 1 or 2. The polymer catcher is a dryer having an adsorbent that adsorbs the polymer.
The refrigerating apparatus according to any one of claims 1 to 3. The dryer further comprises a stabilizer and an antioxidant.
The refrigerating apparatus according to claim 4. The condenser has a flat multi-hole tube through which the refrigerant flows.
The refrigerating apparatus according to any one of claims 1 to 5.

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