Refrigeration Cycle Equipment

Abstract

The refrigeration cycle device (1) includes a refrigerant and a refrigeration cycle circuit. The refrigeration cycle circuit has a compressor (10) and circulates the refrigerant. The refrigerant is an HFO refrigerant alone or a mixed refrigerant. The mixed refrigerant has an HFO refrigerant content of 10% by weight or more. The compressor (10) has a motor (30). The motor (30) has a resin part. The resin part is made of PET, PA, or the like.

Description

[Technical field]

[0001] A refrigeration cycle device used for cooling or heating, etc. [Background technology]

[0002] The refrigeration cycle device of Patent Document 1 (Japanese Patent No. 4932793) uses HFO-1234yf as a refrigerant. Summary of the Invention [Problem to be solved by the invention]

[0003] Some parts used in refrigeration cycle devices contain resin materials. Some types of resin materials react chemically with the refrigerant to generate acid. The acid thus generated may induce corrosion or deterioration of the parts. [Means for solving the problem]

[0004] The refrigeration cycle device according to a first aspect includes a refrigerant and a refrigeration cycle circuit. The refrigeration cycle circuit has a compressor and circulates the refrigerant. The refrigerant is an HFO refrigerant alone or a mixed refrigerant. The mixed refrigerant has a mixing ratio of the HFO refrigerant of 10% by weight or more. The compressor has a motor. The motor has a first resin part. The first resin part is made of PET (polyethylene terephthalate), PA (polyamide), LCP (liquid crystal polymer), PBT (poly B The material is made of at least one of the following: polyethylene terephthalate (PEK), phenol resin, melamine resin, PEEK (polyether ether ketone), PTFE (polytetrafluoroethylene), PAI (polyamide imide), PPS (polyphenylene sulfide), and PEN (polyethylene naphthalate).

[0005] According to this configuration, the motor has a first resin part made of a resin other than PI (polyimide). Therefore, compared to a case where such a first resin part is made of PI, the amount of acid generated by the reaction between the first resin part and the HFO refrigerant is smaller. Therefore, corrosion by acid can be suppressed in the components constituting the refrigeration cycle system.

[0006] A refrigeration cycle device according to a second aspect is the refrigeration cycle device of the first aspect, wherein a ratio of the first resin part to the refrigerant is 1.5% by weight or more.

[0007] According to this configuration, the ratio of the first resin component to the refrigerant is 1.5% by weight or more. Therefore, the first resin component, which is present in a large amount, is less likely to react with the HFO refrigerant, and generation of acid can be suppressed.

[0008] A refrigeration cycle device according to a third aspect is the refrigeration cycle device according to the first or second aspect, further comprising a refrigeration oil and an acid scavenger. The refrigeration oil is stored in the compressor. The acid scavenger is added to the refrigeration oil. A ratio of the acid scavenger to the refrigerant is 1.6% by weight or less.

[0009] According to this configuration, the ratio of the acid scavenger to the refrigerant is 1.6% by weight or less, which makes it possible to suppress the decrease in the lubricity of the refrigeration oil due to the acid scavenger.

[0010] A refrigeration cycle device according to a fourth aspect is a refrigeration cycle device according to any one of the first aspect to the third aspect, wherein the first resin part is at least one selected from a motor insulator, an insulating sleeve, a binding thread, a cluster block, a lead wire coating, and a pull-out wire coating.

[0011] According to this configuration, the parts used in the motor are made of a resin other than PI, which reduces the generation of acid in the motor and reduces corrosion of the motor.

[0012] A refrigeration cycle apparatus according to a fifth aspect is the refrigeration cycle apparatus of the fourth aspect, wherein the first resin part includes an insulator of a motor.

[0013] According to this configuration, the insulator of the motor is made of a resin other than PI. Therefore, the insulator, which takes up a certain volume, is unlikely to react with the HFO refrigerant, thereby suppressing the generation of acid.

[0014] A refrigeration cycle device according to a sixth aspect is a refrigeration cycle device according to any one of the first aspect to the fifth aspect, further comprising a sliding part including at least one of PA (polyamide), PAI (polyamideimide), PPS (polyphenylene sulfide), PEEK (polyether ether ketone), PTFE (polytetrafluoroethylene), and DLC (diamond-like carbon).

[0015] According to this configuration, the coating material of the sliding portion is made of a material other than PI, which prevents acid from being generated in the sliding portion and thus prevents corrosion of the sliding portion.

[0016] A refrigeration cycle device according to a seventh aspect is the refrigeration cycle device according to any one of the first aspect to the sixth aspect, in which the motor further has a second resin part. The second resin part contains PI (polyimide). The ratio of the second resin part to the refrigerant is less than 1.5% by weight.

[0017] According to this configuration, the ratio of the second resin part to the refrigerant is less than 1.5% by weight, which makes it possible to suppress the generation of acid because the ratio of the second resin part to the refrigerant is small.

[0018] A refrigeration cycle apparatus according to an eighth aspect is the refrigeration cycle apparatus according to the seventh aspect, in which the motor has an electric wire covered with an insulating coating, insulating paper, and varnish, and the second resin part includes at least one of the insulating coating, the insulating paper, and the varnish.

[0019] According to this configuration, the second resin component includes at least one of an insulating coating, an insulating paper, and a varnish, which makes it possible to suppress a decrease in the heat resistance of the motor. [Brief description of the drawings]

[0020] [Figure 1] FIG. 1 is a schematic diagram showing a refrigeration cycle device 1. [Diagram 2] FIG. 2 is a cross-sectional view of the compressor 10. [Diagram 3] FIG. 2 is another cross-sectional view of the compressor 10. [Figure 4] FIG. [Diagram 5] 2 is a perspective view of a screw rotor 52 and a gate rotor 53. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] (1) Overall structure 1 shows a refrigeration cycle device 1 according to one embodiment. The refrigeration cycle device 1 includes a refrigeration cycle circuit and a refrigerant that circulates through the refrigeration cycle circuit.

[0022] (1-1) Refrigerant The refrigerant is either an HFO refrigerant alone or a mixed refrigerant. In the case of a mixed refrigerant, the mixing ratio of the HFO refrigerant is 10% by weight or more, preferably 14% by weight or more. As the refrigerant, for example, Refrigerant 1 to Refrigerant 75 shown in the table below can be used.

[0023] [Table 1] TIFF0007645073000002.tif212170

[0024] (1-2) Refrigeration cycle circuit The refrigeration cycle circuit includes a compressor 10, a four-way switching valve 3, a heat source heat exchanger 4, an expansion valve 5, and a utilization heat exchanger 6. The configuration of the compressor 10 will be described later.

[0025] When the four-way valve 3 forms a solid line connection, the utility heat exchanger 6 provides cold heat to the user. When the four-way valve 3 forms a dashed line connection, the utility heat exchanger 6 provides hot heat to the user.

[0026] The expansion valve 5 has a sliding part. The sliding part of the expansion valve 5 is covered with a coating material. The coating material may be, for example, a material other than PI (polyimide), and specifically may be PEEK (polyether ether ketone), PTFE (polytetrafluoroethylene), or DLC (diamond-like carbon).

[0027] (2) Detailed configuration of compressor 10 2 and 3 is a screw type compressor. The compressor 10 includes a casing 20, a motor 30, a shaft 40, and a compression mechanism 50.

[0028] (2-1) Casing 20 The casing 20 is a cylindrical container extending horizontally in the drawing. The internal space of the casing 20 is divided into a low pressure space S1 and a high pressure space S2. Refrigeration oil L is stored below the high pressure space S2. The refrigeration oil L is supplied to various sliding parts of the compressor 10 via an oil supply path (not shown).

[0029] A suction port 25 is provided on the low pressure space S1 side of the casing 20. A discharge port 26 is formed on the high pressure space S2 side of the casing 20. Low pressure gas refrigerant is taken into the compressor 10 from the suction port 25. High pressure gas refrigerant is discharged from the discharge port 26.

[0030] (2-2) Motor 30 The motor 30 is disposed in the low pressure space S1. As shown in Fig. 4, the motor 30 has a stator 31 and a rotor 32. The stator 31 is fixed to the inner circumferential surface of the casing 20. The rotor 32 is disposed in a cavity of the stator 31 and is fixed to the shaft 40.

[0031] The stator 31 includes a stator core 31a, an insulator 31b, a coil winding 31c, insulating paper 31d, an insulated wire 31e, an insulating sleeve 31f, binding strings 31g, a cluster block 31h, lead wires, lead wires, and varnish.

[0032] The stator core 31a is made of laminated steel plates. The insulator 31b is made of resin and is provided on the end surface of the stator core 31a. The coil winding 31c is made of a conductive material and is wound around the stator core 31a and the insulator 31b. The insulating paper 31d is made of resin and is attached to a slot between adjacent coil windings 31c. The insulated electric wire 31e is made of an electric wire and an insulating coating that covers the electric wire. The insulating sleeve 31f is made of resin and insulates the connection part of the insulated electric wire 31e from the surroundings. The binding thread 31g is made of resin and fixes the insulated electric wire 31e to the insulator 31b. The cluster block 31h is a housing of a connector made of resin and detachably connects the multiple insulated electric wires 31e. The lead wire is a conductor for supplying power to the motor 30 from outside the motor 30. The lead wire is provided with a coating. The lead wire is a lead wire extending from the coil winding 31c. The lead wire is provided with a coating, and varnish is used to harden the coil winding 31c.

[0033] The stator core 31a is made of laminated steel plates. The insulator 31b is made of resin and is provided on the end surface of the stator core 31a. The coil winding 31c is made of a conductive material and is wound around the stator core 31a and the insulator 31b. The insulating paper 31d is made of resin and is attached to a slot between adjacent coil windings 31c. The insulated electric wire 31e is made of an electric wire and an insulating coating that covers the electric wire. The insulating sleeve 31f is made of resin and insulates the connection part of the insulated electric wire 31e from the surroundings. The binding thread 31g is made of resin and fixes the insulated electric wire 31e to the insulator 31b. The cluster block 31h is a housing of a connector made of resin and detachably connects the multiple insulated electric wires 31e. The lead wire is a conductor for supplying power to the motor 30 from outside the motor 30. The lead wire is provided with a coating. The lead wire is a lead wire extending from the coil winding 31c. The lead wire is provided with a coating, and varnish is used to harden the coil winding 31c. The insulator 31b, insulating paper 31d, the covering of the insulated electric wire 31e, insulating sleeve 31f, binding thread 31g, cluster block 31h, the covering of the lead wire, the covering of the pull-out wire, and varnish are resin parts. Of these, at least one of the covering of the insulated electric wire 31e, the insulating paper 31d, and the varnish is made of a material containing PI (polyimide). As the material for the covering of the insulated electric wire 31e, PI may be used in order to achieve strength. As the material for the insulating paper 31d and the varnish, PI may be used in order to achieve heat resistance. On the other hand, the insulator 31b, insulating sleeve 31f, binding thread 31g, cluster block 31h, the covering of the lead wire, and the covering of the pull-out wire are made of a resin material other than PI. Examples of resin materials other than PI include PET (polyethylene terephthalate), PA (polyamide), LCP (liquid crystal polymer), and PBT (polyimide). B Examples of suitable resins include polyethylene terephthalate, phenol resin, melamine resin, PEEK (polyether ether ketone), PTFE (polytetrafluoroethylene), PAI (polyamide imide), PPS (polyphenylene sulfide), and PEN (polyethylene naphthalate).

[0034] For example, the insulator 31b includes PA, LCP, or PBT. For example, the insulating sleeve 31f includes PET or PA. For example, the binding thread 31g includes PET. For example, the cluster block 31h includes PBT, phenolic resin, or melamine resin.

[0035] The ratio of parts made of resin materials other than PI to the refrigerant is 1.5% by weight or more.

[0036] The ratio of parts made of resin material containing PI to the refrigerant is less than 1.5% by weight.

[0037] (2-3) Shaft 40 2 and 3, the shaft 40 transmits the power generated by the motor 30 to the compression mechanism 50. The shaft 40 is fixed to the rotor 32 and rotates together with the rotor 32. The shaft 40 is rotatably supported by a bearing 41. When a plain bearing is used for the bearing 41, the resin material contained in the plain bearing is a resin material other than PI, for example, PA, PTFE, PEEK, PAI, or PPS.

[0038] (2-4) Compression mechanism 50 The compression mechanism 50 compresses a low-pressure gas refrigerant to generate a high-pressure gas refrigerant. The compression mechanism 50 includes a cylinder 51, a screw rotor 52, a gate rotor 53, and a gate rotor support portion .

[0039] (2-4-1) Cylinder 51 The cylinder 51 is formed as a part of the casing 20. The cylinder 51 accommodates the screw rotor 52. The cylinder 51 has a gap through which a gate 53a (described later) passes.

[0040] (2-4-2) Screw rotor 52 The screw rotor 52 is a metal member having a generally cylindrical shape. The screw rotor 52 is connected to the shaft 40. The screw rotor 52 is rotatable together with the shaft 40. The outer diameter of the screw rotor 52 is slightly smaller than the inner diameter of the cylinder 51.

[0041] 5 shows the screw rotor 52 and the gate rotor 53. In this figure, the cylinder 51 is omitted. A plurality of spiral grooves 52a extending spirally in the direction of the rotation axis of the screw rotor 52 are provided on the outer periphery of the screw rotor 52.

[0042] (2-4-3) Gate rotor 53 The gate rotor 53 is a rotor having a plurality of gates 53a extending radially. The gates 53a penetrate the gap of the cylinder 51 and mesh with the helical grooves 52a of the screw rotor 52. The screw rotor 52 rotates due to the rotational force received from the shaft 40, and as a result, the helical grooves 52a move. The gates 53a move in response to the movement of the helical grooves 52a, and the gate rotor 53 rotates.

[0043] (2-4-4) Gate rotor support part 54 The gate rotor support portion 54 rotatably supports the gate rotor 53. The two gate rotor support portions 54 are disposed symmetrically with respect to the rotation axis of the screw rotor 52.

[0044] (2-5)Other The screw rotor 52 slides against the cylinder 51 and the gate rotor 53. These sliding parts may be covered with a coating material. For example, the coating material is made of PEEK, PTFE, or DLC.

[0045] (3) Compression Operation The low-pressure gas refrigerant sucked through the suction port 25 shown in FIG. 2 enters the low-pressure space S1. In the compression mechanism 50, a space surrounded by the cylinder 51, the spiral groove 52a, and the gate 53a functions as a compression chamber. As the screw rotor 52 rotates, the compression chamber on the low-pressure space S1 side moves toward the high-pressure space S2 side while gradually reducing its volume. As a result, the low-pressure gas refrigerant is compressed into high-pressure gas refrigerant and discharged into the high-pressure space S2. Finally, the high-pressure gas refrigerant is discharged from the discharge port 26 to the outside of the compressor 10.

[0046] (4) Refrigerating machine oil L The refrigeration oil L is a lubricating oil used to prevent wear and seizure in the sliding parts of the compressor 10. The refrigeration oil L mainly comprises a base oil, an acid scavenger, an extreme pressure agent, and an antioxidant.

[0047] (4-1) Base oil The base oil is a mineral oil or a synthetic oil. The base oil is appropriately selected from those having good compatibility with the refrigerant used in the refrigeration cycle device 1. The mineral oil is, for example, a naphthenic mineral oil or a paraffinic mineral oil. The synthetic oil is, for example, an ester compound, an ether compound, a polyα-olefin, or an alkylbenzene. Specific examples of the synthetic oil include polyvinyl ether, polyol ester, and polyalkylene glycol. In this embodiment, it is preferable to use a synthetic oil such as polyvinyl ether or polyol ester as the base oil. Note that a mixture of two or more of the above mineral oils or synthetic oils may be used as the base oil.

[0048] (4-2) Acid Scavenger The acid scavenger is an additive used to suppress deterioration of the refrigerating machine oil L caused by the acid by reacting with the acid generated by decomposition of the refrigerant. Examples of the acid scavenger are epoxy compounds, carbodiimide compounds, and tempene compounds. Specific examples of the acid scavenger include 2-ethylhexyl glycidyl ether, phenyl glycidyl ether, epoxidized cyclohexyl carbinol, di(alkylphenyl)carbodiimide, and β-pinene.

[0049] (4-3) Extreme pressure agents Extreme pressure agents are additives used to prevent wear and seizure in sliding parts. The refrigeration oil L forms an oil film between the surfaces of the sliding members that slide against each other in the sliding parts, thereby preventing contact between the sliding members. However, when a low-viscosity refrigeration oil L such as polyvinyl ether is used, and when the pressure applied to the sliding members is high, the sliding members are likely to come into contact with each other. The extreme pressure agent reacts with the surfaces of the sliding members that slide against each other in the sliding parts to form a film, thereby suppressing the occurrence of wear and seizure. Examples of extreme pressure agents include phosphate esters, phosphites, thiophosphates, sulfurized esters, sulfides, and thiobisphenols. Specific examples of extreme pressure agents include tricresyl phosphate (TCP), triphenyl phosphate (TPP), triphenyl phosphorothioate (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.

[0050] (4-4) Antioxidants The antioxidant is an additive used to prevent oxidation of the refrigeration oil L. Specific examples of the antioxidant include zinc dithiophosphate, organic sulfur compounds, phenol-based antioxidants such as 2,6-di-tert-butyl-4-methylphenol, 2,6-di-tert-butyl-4-ethylphenol, and 2,2'-methylenebis(4-methyl-6-tert-butylphenol), amine-based antioxidants such as phenyl-α-naphthylamine and N,N'-di-phenyl-p-phenylenediamine, and N,N'-disalicylidene-1,2-diaminopropane.

[0051] (4-5) Mixing ratio The acid scavenger is contained in the refrigeration oil L in an amount of, for example, 1.0% by weight or more. This suppresses deterioration of the refrigeration oil L and corrosion of the expansion valve 5 caused by acid. In addition, corrosion of other components of the refrigeration cycle device 1 is also suppressed. Therefore, by using the refrigeration oil L in this embodiment, the reliability of the refrigeration cycle device 1 is improved.

[0052] The ratio of the acid scavenger to the refrigerant is 1.6% by weight or less, which suppresses the deterioration of the lubricating performance of the refrigerating machine oil L.

[0053] (5) Features (5-1) The inventors have found that PI is prone to generating acid through a reaction with an HFO refrigerant. The insulating components of the motor 30 described above (i.e., the insulator 31b, the insulating sleeve 31f, the binding thread 31g, the cluster block 31h, the coating of the lead wire, and the coating of the lead wire) are made of a resin other than PI. Therefore, compared to when these insulating components are made of PI, the amount of acid generated through the reaction between the insulating components and the HFO refrigerant is smaller. This makes it possible to suppress corrosion by acid in the components that make up the refrigeration cycle system.

[0054] (5-2) The ratio of insulating parts made of resin other than PI (i.e., insulator 31b, insulating sleeve 31f, binding thread 31g, cluster block 31h, lead wire coating, and lead wire coating) to the refrigerant is 1.5% by weight or more. Therefore, since a large amount of insulating parts is less likely to react with the HFO refrigerant, acid generation can be suppressed.

[0055] (5-3) The ratio of the acid scavenger to the refrigerant is 1.6% by weight or less, so that the lubricity of the refrigerating machine oil L can be prevented from being reduced by the acid scavenger.

[0056] (5-4) The components used in the motor 30 (i.e., the insulator 31b, the insulating sleeve 31f, the binding string 31g, the cluster block 31h, the coating of the lead wire, and the coating of the lead wire) are made of a resin other than PI. Therefore, generation of acid in the motor 30 is suppressed, and corrosion of the motor 30 can be suppressed.

[0057] (5-5) The insulator 31b of the motor 30 is made of a resin other than PI. Therefore, the insulator 31b, which occupies a certain volume, is unlikely to react with the HFO refrigerant, and the generation of acid can be suppressed.

[0058] (5-6) Materials other than PI are used for the coating material of the expansion valve 5 or the sliding parts such as the plain bearing of the shaft 40. Therefore, generation of acid in the sliding parts is suppressed, and corrosion of the sliding parts can be suppressed.

[0059] (5-7) A portion of the motor 30 is made of a resin containing PI, and the ratio of the resin containing PI to the refrigerant is less than 1.5% by weight. Therefore, the ratio of parts containing PI to the refrigerant is low, which makes it possible to suppress the generation of acid.

[0060] (5-8) At least one of the insulating coating, the insulating paper 31d, and the varnish contains PI, so that deterioration of the heat resistance of the motor 30 can be suppressed.

[0061] (6) Variations (6-1) First Modification In the above embodiment, at least one of the coating of the insulated wire 31e, the insulating paper 31d, and the varnish contains PI. Alternatively, the coating of the insulated wire 31e, the insulating paper 31d, and the varnish do not need to contain PI. For example, the coating of the insulated wire 31e, the insulating paper 31d, and the varnish may be made of a resin other than PI.

[0062] According to this configuration, the refrigeration cycle apparatus 1 is less likely to generate acid.

[0063] (6-2) Second Modification In the above embodiment, the compressor 10 is a screw type compressor. Alternatively, the compressor may be other types of compressors, such as a scroll type compressor or a rotary type compressor.

[0064] <Conclusion> Although the embodiments of the present disclosure have been described above, it will be understood that various changes in form and details can be made without departing from the spirit and scope of the present disclosure described in the claims. [Explanation of symbols]

[0065] 1: Refrigeration cycle device 5: Expansion valve 10: Compressor 30: Motor 31: Stator 31a: Stator core 31b: Insulator 31c: Coil winding 31d: Insulating paper 31e: Insulated wire 31f: Insulating sleeve 31g: Binding thread 31h : Cluster block 32: Rotor 40: Shaft 50: Compression mechanism L: Refrigerating machine oil [Prior art documents] [Patent documents]

[0066] [Patent Document 1] Patent No. 4932793

Claims

1. A refrigerant; a refrigeration cycle circuit having a compressor (10) and circulating the refrigerant; Equipped with The refrigerant is a single HFO refrigerant or a mixed refrigerant having an HFO refrigerant mixing ratio of 10% by weight or more, The compressor has a motor (30); The motor is A first resin part (31b, 31f, 31g, 31h); A second resin part; having The first resin part is PET (polyethylene terephthalate), PA (polyamide), LCP (liquid crystal polymer), PBT (polybutylene terephthalate), Phenolic resin, Melamine resin, PEEK (polyetheretherketone), PTFE (polytetrafluoroethylene), PAI (polyamide imide), PPS (polyphenylene sulfide), and PEN (polyethylene naphthalate), At least one of The second resin part is PI (polyimide), Including, The ratio of the first resin part to the refrigerant is 1.5% by weight or more, the first resin part includes an insulator (31b) of the motor, The ratio of the second resin part to the refrigerant is less than 1.5% by weight, The second resin part includes at least one of an insulating coating covering an electric wire, an insulating paper, and a varnish. Refrigeration cycle device (1).

2. Refrigerating machine oil (L) stored in the compressor; An acid scavenger added to the refrigerating machine oil; Further equipped with The ratio of the acid scavenger to the refrigerant is 1.6% by weight or less. The refrigeration cycle device according to claim 1.

3. The first resin part further includes at least one selected from an insulating sleeve (31f), a binding string (31g), a cluster block (31h), a coating of a lead wire, and a coating of a lead wire of the motor. The refrigeration cycle device according to claim 1 or 2.

4. PA (polyamide), PAI (polyamide imide), PPS (Polyphenylene Sulfide) PEEK (polyetheretherketone), PTFE (polytetrafluoroethylene), and DLC (Diamond-Like Carbon), The sliding portion further includes at least one of the following: The refrigeration cycle device according to any one of claims 1 to 3.

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