Compressor and compressor system

Abstract

To provide a compressor that can restrain a disproportionation reaction of an HFO refrigerant to the extent possible.SOLUTION: A compressor 1D comprises: a housing 2D inside which a refrigerant flows; a rotary compression mechanism 6A provided inside the housing 2D, and compressing the refrigerant; and an electric motor 5D provided inside the housing 2D, and driving the rotary compression mechanism 6A. The refrigerant is an HFO refrigerant containing R1123 or R1132(E), or a mixed refrigerant containing the HFO refrigerant. A pressure in a motor space S4 containing a winding 53D of the electric motor 5D is 6 MPa or less. The rotary compression mechanism 6A sucks the refrigerant from the motor space S4, and discharges it to the outside of the housing 2D after compression.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to compressors and compressor systems that use HFO refrigerants or mixed refrigerants that include HFO refrigerants. [Background technology]

[0002] 2. Description of the Related Art HFO (hydro fluoro olefin) refrigerants including R1123 and R1132(E) are known as low GWP (Global Warming Potential) refrigerants.

[0003] The above-mentioned HFO refrigerants are less stable than conventional working fluids such as R410A, and the disproportionation reaction causes a large heat release and pressure increase, which may reduce the reliability of the compressor.

[0004] In the following Patent Document 1, a communication part is provided in the outdoor unit of an air conditioner housing a compressor, which connects the compressor housing space with the outside of the compressor housing space. When a disproportionation reaction occurs in the compressor, damaging the compressor and causing the working medium to turn into soot, which is discharged and diffused into the compressor housing space, the soot is discharged from the communication part to the outside of the outdoor unit. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 7149494 Summary of the Invention [Problem to be solved by the invention]

[0006] The technique disclosed in Patent Document 1 is effective as a measure to be taken when a disproportionation reaction occurs in a compressor. However, it is more preferable to suppress the disproportionation reaction that may occur in a compressor as much as possible.

[0007] The present disclosure has been made in consideration of the above circumstances, and has an object to provide a compressor and a compressor system that can suppress, as much as possible, the disproportionation reaction of an HFO refrigerant or a mixed refrigerant containing an HFO refrigerant. [Means for solving the problem]

[0008] A compressor according to one aspect of the present disclosure includes a housing through which a refrigerant flows, a compression unit provided inside the housing and compressing the refrigerant, and an electric motor provided inside the housing and driving the compression unit, wherein the refrigerant is an HFO refrigerant containing R1123 or R1132(E) or a mixed refrigerant containing the HFO refrigerant, a pressure in a motor space including a winding of the electric motor is 6 MPa or less, the compression unit includes a rotary compression mechanism provided at one end of the housing and a scroll compression mechanism provided at the other end of the housing, the motor space is disposed between the rotary compression mechanism and the scroll compression mechanism, the rotary compression mechanism discharges the refrigerant compressed by the rotary compression mechanism into the motor space, and the scroll compression mechanism draws in and compresses the refrigerant from the motor space.

[0009] A compressor according to one aspect of the present disclosure includes a housing through which a refrigerant flows, a compression unit provided inside the housing and compressing the refrigerant, and an electric motor provided inside the housing and driving the compression unit, wherein the refrigerant is an HFO refrigerant including R1123 or R1132(E) or a mixed refrigerant including the HFO refrigerant, a pressure in a motor space including windings of the electric motor is 6 MPa or less, and the compression unit includes a rotary compression mechanism that draws in the refrigerant from the motor space, compresses it, and then discharges it to the outside of the housing.

[0010] A compressor system according to one aspect of the present disclosure includes a rotary compressor that compresses a refrigerant, and a scroll compressor that sucks in and compresses the refrigerant discharged from the rotary compressor, the rotary compressor including a first housing through which the refrigerant flows, a rotary compression section provided inside the first housing and compressing the refrigerant, a first electric motor provided inside the first housing and driving the rotary compression section, and a first motor space into which the refrigerant compressed by the rotary compression section is guided and which includes a winding of the first electric motor, and the scroll compressor includes a first housing through which the refrigerant flows, a rotary compression section provided inside the first housing and compressing the refrigerant, a first electric motor provided inside the first housing and driving the rotary compression section, and a first motor space into which the refrigerant compressed by the rotary compression section is guided and which includes a winding of the first electric motor. the first motor space includes a second housing for compressing a refrigerant, a scroll compression section provided inside the second housing and compressing a refrigerant, a second electric motor provided inside the second housing and driving the scroll compression section, and a second motor space to which refrigerant discharged from the rotary compressor is guided and which is provided on the refrigerant suction side of the scroll compression section and includes a winding of the second electric motor, wherein the refrigerant is an HFO refrigerant containing R1123 or R1132(E) or a mixed refrigerant containing the HFO refrigerant, and the pressure in the first motor space and the second motor space is 6 MPa or less.

[0011] A compressor according to one embodiment of the present disclosure includes a housing through which a refrigerant flows, a compression unit provided inside the housing and compressing the refrigerant, and an electric motor provided inside the housing and driving the compression unit, wherein the refrigerant is an HFO refrigerant containing R1123 or R1132(E) or a mixed refrigerant containing the HFO refrigerant, and the electric motor includes a neodymium magnet, and the demagnetization temperature of the neodymium magnet is 120°C or higher and 150°C or lower. Effect of the Invention

[0012] It is possible to suppress as much as possible the disproportionation reaction of HFO refrigerants or mixed refrigerants containing HFO refrigerants. [Brief description of the drawings]

[0013] [Figure 1] 1 is a vertical cross-sectional view showing a compressor system according to a first embodiment of the present disclosure. [Diagram 2]FIG. 4 is a vertical cross-sectional view showing a compressor according to a second embodiment of the present disclosure. [Diagram 3] FIG. 11 is a vertical cross-sectional view showing a compressor according to a third embodiment of the present disclosure. [Figure 4] 4 is a plan view of the rotary compression mechanism in which the compression chamber in FIG. 3 is viewed from above. [Diagram 5] FIG. 5 is an enlarged longitudinal sectional view of the blade chamber of FIG. 4. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. [First embodiment] The first embodiment of the present disclosure will be described below. A compressor system 1 according to this embodiment is shown in Fig. 1. The compressor system 1 includes a rotary compressor 1A and a scroll compressor 1B. The compressor system 1 employs a two-stage compression system in which a refrigerant compressed by the rotary compressor 1A is guided to the scroll compressor 1B and further compressed.

[0015] The refrigerant used is an HFO (hydrofluoroolefin) refrigerant, such as R474A (a mixed refrigerant of R1132(E) and R1234yf) or R479A (a mixed refrigerant containing R1132(E), R1234yf, and R32). When the three factors of pressure, temperature, and ignition energy are met, such an HFO refrigerant or a mixed refrigerant containing the HFO refrigerant undergoes a disproportionation reaction accompanied by a large heat release. The pressure, temperature, and ignition energy at which the disproportionation reaction occurs are, for example, approximately 6 MPa, 150°C, and 30 J, respectively.

[0016] The rotary compressor 1A is a hermetically sealed electric rotary compressor used in, for example, air conditioners, refrigeration devices, etc. The rotary compressor 1A includes a compressor body 10A and an accumulator 12. The accumulator 12 includes an inlet pipe 15 for introducing a refrigerant into an upper portion thereof, and is connected to the compressor body 10A via a suction pipe 11.

[0017] The compressor body 10A includes a substantially cylindrical housing (first housing) 2A, a rotating shaft body 3A, an electric motor (first electric motor) 5A, and a rotary compression mechanism (compression section) 6A.

[0018] A discharge pipe 13 and a power supply terminal 30A are provided at the top of the housing 2A. The discharge pipe 13 discharges the compressed refrigerant to the outside of the housing 2A. Three-phase power is supplied to the power supply terminal 30A from an inverter device (not shown). Power is supplied from the power supply terminal 30A to the electric motor 5A via a wiring 32A.

[0019] The electric motor 5A is accommodated in the vertical center of the housing 2A. The electric motor 5A includes a rotor 51A and a stator 52A. The rotor 51A is fixed to the outer circumferential surface of the rotating shaft 3A and disposed above the rotary compression mechanism 6A. The stator 52A is disposed so as to surround the outer circumferential surface of the rotor 51A and is fixed to the inner surface of the housing 2A.

[0020] A neodymium magnet is used in the rotor 51A. The demagnetization temperature of the neodymium magnet is set to be 120°C or higher and 150°C or lower.

[0021] The stator 52A includes a winding 53A. A space including the winding 53A is defined as a first motor space S1. The pressure in the first motor space S1 is set to 6 MPa or less.

[0022] Electric power is supplied from power supply terminal 30A through wiring 32A to windings 53A of stator 52A. Electric motor 5A rotates rotating shaft 3A using the supplied electric power.

[0023] The rotary compression mechanism 6A is disposed at the bottom of the housing 2A below the electric motor 5A. The rotary compression mechanism 6A is arranged in two stages, one above the other, and includes a piston rotor 63 in a compression chamber 61 which is a cylindrical space. The piston rotor 63 rotates eccentrically in the compression chamber 61 by the rotating shaft 3A.

[0024] The scroll compressor 1B is a hermetic electric scroll compressor used in, for example, air conditioners, refrigeration devices, etc. The scroll compressor 1B includes a compressor body 10B.

[0025] The compressor body 10B includes a substantially cylindrical housing (second housing) 2B, a rotating shaft body 3B, an electric motor (second electric motor) 5B, and a scroll compression mechanism (compression section) 6B.

[0026] A suction pipe 16 and a power supply terminal 30B are provided below the scroll compression mechanism 6B in the housing 2B. The suction pipe 16 draws the refrigerant compressed by the rotary compressor 1A into the housing 2B. Three-phase power is supplied to the power supply terminal 30B from an inverter device (not shown). Power is supplied from the power supply terminal 30B to the electric motor 5B via a wiring 32B.

[0027] A discharge pipe 17 is provided at an upper portion of the housing 2B. The discharge pipe 17 discharges the refrigerant compressed by the scroll compression mechanism 6B to the outside of the scroll compressor 1B.

[0028] The electric motor 5B is accommodated in the vertical center of the housing 2B. The electric motor 5B includes a rotor 51B and a stator 52B. The rotor 51B is fixed to the outer circumferential surface of the rotating shaft body 3B and disposed below the scroll compression mechanism 6B. The stator 52B is disposed so as to surround the outer circumferential surface of the rotor 51B and is fixed to the inner surface of the housing 2B.

[0029] A neodymium magnet is used for rotor 51B. The demagnetization temperature of a neodymium magnet is set to 120°C or higher and 150°C or lower.

[0030] The stator 52B includes a winding 53B. A space including the winding 53B is defined as a second motor space S2. The pressure in the second motor space S2 is set to 6 MPa or less.

[0031] Electric power is supplied to the stator 52B from the power supply terminal 30B via a wire 32B. The electric motor 5B rotates the rotating shaft 3B by the supplied electric power.

[0032] The scroll compression mechanism 6B is disposed above the electric motor 5B and in the upper part of the housing 2B. The scroll compression mechanism 6B includes an orbiting scroll 64 that performs an orbital motion by the rotating shaft body 3B, and a fixed scroll 65 that meshes with the orbiting scroll 64 to form a compression chamber.

[0033] The above-described compressor system 1 operates as follows. In FIG. 1, the flow of the refrigerant is indicated by thick arrows.

[0034] The refrigerant is guided from, for example, an evaporator (not shown) and flows into the accumulator 12 through an inlet pipe 15. The gas-phase refrigerant separated into gas and liquid in the accumulator 12 passes through a suction pipe 11 of the rotary compressor 1A and is guided to the rotary compression mechanism 6A. In the rotary compression mechanism 6A, the refrigerant is compressed by a piston rotor 63 that rotates together with the rotating shaft 3A. The compressed refrigerant is discharged from the rotary compression mechanism 6A into the first motor space S1 in the housing 2A.

[0035] The refrigerant that has flowed into the first motor space S1 flows upward through the through holes formed in the rotor 51A. At this time, the refrigerant passes around the winding 53A and the power supply terminal 30A. Then, the refrigerant passes through the discharge pipe 13 and is discharged to the outside of the rotary compressor 1A.

[0036] The refrigerant discharged from rotary compressor 1A is guided to suction pipe 16 of scroll compressor 1B via a connecting pipe (not shown) as indicated by a thick arrow. The refrigerant that flows from suction pipe 16 into housing 2B passes around winding 53B and power supply terminal 30B, and is guided to scroll compression mechanism 6B.

[0037] In the scroll compression mechanism 6B, the refrigerant is compressed in a compression chamber formed by the orbiting scroll 64 and the fixed scroll 65, and then discharged from the discharge pipe 17 to the outside of the scroll compressor 1B.

[0038] The effects of the present embodiment described above are as follows. When the three factors of pressure, temperature, and ignition energy are met, HFO refrigerants containing R1123 or R1132(E) or mixed refrigerants containing the HFO refrigerants may cause a disproportionation reaction. Therefore, the pressure in the motor spaces S1 and S2 containing the windings 53A and 53B of the electric motors 5A and 5B is set to 6 MPa or less. This makes it possible to suppress the disproportionation reaction of the HFO refrigerant as much as possible.

[0039] The refrigerant compressed by the rotary compression mechanism 6A passes through the first motor space S1 and is discharged from the rotary compressor 1A. The refrigerant discharged from the rotary compressor 1A is guided to the scroll compressor 1B, passes through the second motor space S2, and is compressed by the scroll compression mechanism 6B. This allows the first motor space S1 and the second motor space S2 to be at an intermediate pressure between the low pressure at which the rotary compressor 1A sucks in the refrigerant and the high pressure at which the scroll compressor 1B discharges the refrigerant, and allows the first motor space S1 and the second motor space S2 to be at 6 MPa or less. This allows the disproportionation reaction of the HFO refrigerant to be suppressed as much as possible even if the windings 53A, 53B or the wiring 32A, 32B are shorted.

[0040] The demagnetization temperature of the neodymium magnets used in the electric motors 5A, 5B is set to 120°C or higher and 150°C or lower, and when it exceeds 150°C, thermal demagnetization occurs and operation of the electric motors 5A, 5B is suppressed (or stopped). This makes it possible to prevent the electric motors 5A, 5B from continuing to operate at temperatures above 150°C, thereby suppressing the disproportionation reaction of the refrigerant.

[0041] [Second embodiment] Next, a second embodiment of the present disclosure will be described. 2 shows a compressor 1C according to this embodiment. The compressor 1C includes a rotary compression mechanism 6A and a scroll compression mechanism 6B in a housing 2C. The rotary compression mechanism 6A is disposed at the bottom (one end) of the housing 2C, and the scroll compression mechanism 6B is disposed at the top (the other end) of the housing 2C.

[0042] The refrigerant used is an HFO (hydrofluoroolefin) refrigerant or a mixed refrigerant containing the HFO refrigerant, such as R474A (a mixed refrigerant of R1132(E) and R1234yf) or R479A (a mixed refrigerant containing R1132(E), R1234yf, and R32). When the three factors of pressure, temperature, and ignition energy are met, such an HFO refrigerant or a mixed refrigerant containing the HFO refrigerant undergoes a disproportionation reaction accompanied by a large heat release. The pressure, temperature, and ignition energy at which the disproportionation reaction occurs are, for example, approximately 6 MPa, 150°C, and 30 J, respectively.

[0043] An electric motor 5C is provided between the rotary compression mechanism 6A and the scroll compression mechanism 6B. The electric motor 5C includes a rotor 51C and a stator 52C. The rotor 51C is fixed to the outer circumferential surface of the rotary shaft body 3C and disposed above the rotary compression mechanism 6A. The stator 52C is disposed so as to surround the outer circumferential surface of the rotor 51C and is fixed to the inner surface of the housing 2C.

[0044] The rotating shaft 3B extends both above and below the electric motor 5C. A piston rotor 63 is rotated at the lower end of the rotating shaft 3B, and an orbiting scroll 64 is rotated at the upper end.

[0045] Rotor 51C uses a neodymium magnet, the demagnetization temperature of which is set to 120°C or higher and 150°C or lower.

[0046] The stator 52C includes a winding 53C. The space including the winding 53C is defined as a motor space S3. The pressure in the motor space S3 is set to 6 MPa or less.

[0047] Electric power is supplied from a power supply terminal 30C to the windings 53C of the stator 52C. The electric motor 5C rotates a rotating shaft 3C by the supplied electric power.

[0048] The rotary compression mechanism 6A is disposed at the bottom of the housing 2C below the electric motor 5C. The rotary compression mechanism 6A includes a piston rotor 63 in a compression chamber 61 that is a cylindrical space. The piston rotor 63 rotates eccentrically in the compression chamber 61 by the rotating shaft 3C.

[0049] The scroll compression mechanism 6B is disposed above the electric motor 5C and in the upper part of the housing 2C. The scroll compression mechanism 6B includes an orbiting scroll 64 that performs an orbital motion by the rotating shaft body 3C, and a fixed scroll 65 that meshes with the orbiting scroll 64 to form a compression chamber. The scroll compression mechanism 6B includes a discharge cover 66 above the fixed scroll 65. The lower end of the discharge pipe 17 is connected to the upper end of the discharge cover 66.

[0050] The power supply terminal 30C is provided at the upper part of the housing 2C. The upper part of the housing 2C where the power supply terminal 30C is provided and where the wiring 32C is arranged is partitioned off by the discharge cover 66 of the scroll compression mechanism 6B. Therefore, the upper part of the housing 2C is not at the pressure of the high-pressure refrigerant discharged from the scroll compression mechanism 6B, but at a pressure (intermediate pressure) equivalent to that of the motor space S3.

[0051] The above-described compressor 1C operates as follows. In FIG. 2, the flow of the refrigerant is indicated by thick arrows.

[0052] The refrigerant is guided from, for example, an evaporator (not shown) and flows into the accumulator 12 through the inlet pipe 15. The gas-phase refrigerant separated into gas and liquid in the accumulator 12 passes through the suction pipe 11 and is guided to the rotary compression mechanism 6A. In the rotary compression mechanism 6A, the refrigerant is compressed by the piston rotor 63 that rotates together with the rotating shaft 3C. The compressed refrigerant is discharged from the rotary compression mechanism 6A into the motor space S3 located in the center of the housing 2C.

[0053] The refrigerant that has flowed into the motor space S3 flows upward through the through holes formed in the rotor 51C. At this time, the refrigerant passes around the windings 53C and the wiring 32C led from the power supply terminal 30C. The refrigerant is then led to the scroll compression mechanism 6B.

[0054] In the scroll compression mechanism 6B, the refrigerant is compressed in a compression chamber formed by the orbiting scroll 64 and the fixed scroll 65, and then discharged from the discharge pipe 17 to the outside of the compressor 1C.

[0055] The effects of the present embodiment described above are as follows. When the three factors of pressure, temperature, and ignition energy are met, HFO refrigerants containing R1123 or R1132(E) or mixed refrigerants containing the HFO refrigerants may cause a disproportionation reaction. Therefore, the pressure in the motor space S3 including the winding 53C of the electric motor 5C is set to 6 MPa or less. This makes it possible to suppress the disproportionation reaction of the HFO refrigerant as much as possible.

[0056] A motor space S3 is provided between the rotary compression mechanism 6A and the scroll compression mechanism 6B, and the refrigerant compressed by the rotary compression mechanism 6A is discharged into the motor space S3, and the scroll compression mechanism 6B draws in the refrigerant from the motor space S3 and compresses it. This allows the motor space S3 to be at an intermediate pressure between the low pressure at which the rotary compression mechanism 6A draws in the refrigerant and the high pressure at which the scroll compression mechanism 6B discharges the refrigerant, and the motor space S3 can be set to 6 MPa or less. This makes it possible to suppress the disproportionation reaction of the HFO refrigerant as much as possible even if the winding 53C or the wiring 32C is shorted.

[0057] The demagnetization temperature of the neodymium magnet used in the electric motor 5C is set to 120°C to 150°C, and when it exceeds 150°C, thermal demagnetization occurs and operation as the electric motor 5C is suppressed (or stopped). This makes it possible to prevent the electric motor 5C from continuing to operate at a temperature above 150°C, thereby suppressing the disproportionation reaction of the refrigerant.

[0058] [Third embodiment] Next, a third embodiment of the present disclosure will be described. 3 shows a compressor 1D according to this embodiment. The refrigerant used in the compressor 1D is an HFO (hydrofluoroolefin) refrigerant or a mixed refrigerant containing the HFO refrigerant, such as R474A (a mixed refrigerant of R1132(E) and R1234yf) or R479A (a mixed refrigerant containing R1132(E), R1234yf, and R32). When the three factors of pressure, temperature, and ignition energy are met, such an HFO refrigerant or a mixed refrigerant containing the HFO refrigerant causes a disproportionation reaction accompanied by a large heat release. The pressure, temperature, and ignition energy at which the disproportionation reaction occurs are, for example, 6 MPa, 150°C, and 30 J, respectively.

[0059] The compressor 1D is a hermetic electric rotary compressor used in, for example, an air conditioner, a refrigeration device, etc. The compressor 1D includes a substantially cylindrical housing 2D, a rotating shaft 3D, an electric motor 5D, and a rotary compression mechanism (compression section) 6A.

[0060] A suction pipe 11 and a power supply terminal 30D are provided at the top of the housing 2D. Low-pressure refrigerant guided from an evaporator or the like is guided into the housing 2D through the suction pipe 11. Three-phase power is supplied to the power supply terminal 30D from an inverter device (not shown). Power is supplied from the power supply terminal 30D to the electric motor 5D via a wiring 32D.

[0061] The electric motor 5D is accommodated in the vertical center of the housing 2D. The electric motor 5D includes a rotor 51D and a stator 52D. The rotor 51D is fixed to the outer circumferential surface of the rotating shaft body 3D and disposed above the rotary compression mechanism 6A. The stator 52D is disposed so as to surround the outer circumferential surface of the rotor 51D and is fixed to the inner surface of the housing 2D.

[0062] A neodymium magnet is used in the rotor 51D. The demagnetization temperature of the neodymium magnet is set to 120°C or higher and 150°C or lower.

[0063] The stator 52D includes a winding 53D. The space including the winding 53D is defined as a motor space S4. The pressure in the motor space S4 is set to 6 MPa or less.

[0064] Electric power is supplied from a power supply terminal 30D through wiring 32D to windings 53D of a stator 52D. The electric motor 5D rotates a rotating shaft 3D by the supplied electric power.

[0065] The rotary compression mechanism 6A is disposed at the bottom of the housing 2D below the electric motor 5D. The rotary compression mechanism 6A includes a piston rotor 63 in a compression chamber 61 that is a cylindrical space. The piston rotor 63 rotates eccentrically in the compression chamber 61 by the rotating shaft 3D.

[0066] The rotary compression mechanism 6A is disposed in a state where it is sandwiched from above and below by an upper bearing 70A and a lower bearing 70B. The rotating shaft 3D is rotatably supported by the upper bearing 70A and the lower bearing 70B.

[0067] A high-pressure reservoir chamber 69 is formed between the compression chamber 61 and the upper bearing 70A to temporarily store the high-pressure refrigerant compressed by the piston rotor 63. The high-pressure refrigerant is discharged from the discharge pipe 17 through the high-pressure reservoir chamber 69 to the outside of the compressor 1D.

[0068] 4 shows a plan view of the rotary compression mechanism 6A, in which the compression chamber 61 is viewed from above. Tips of the blades 72 contact the outer circumferential surface of the piston rotor 63. The blades 72 divide the inside of the compression chamber 61 to form a pressure partition.

[0069] A spring 74 that urges the blade 72 toward the tip end is provided on the rear end side of the blade 72. The spring 74 is provided in a blade chamber 75 that houses the rear end portion of the blade 72.

[0070] 5, a communication passage 77 is provided between the blade chamber 75 and the high-pressure reservoir 69. The communication passage 77 guides the high-pressure refrigerant from the high-pressure reservoir 69 to the blade chamber 75.

[0071] The above-described compressor 1D operates as follows. In FIG. 3, the flow of the refrigerant is indicated by thick arrows.

[0072] The refrigerant is guided from, for example, an evaporator (not shown) and is guided from the suction pipe 11 to the motor space S4 in the housing 2D.

[0073] The refrigerant that has flowed into the motor space S4 passes through the through holes formed in the rotor 51A and flows downward. During this process, the refrigerant passes around the windings 53D and around the wiring 32D that is led from the power supply terminal 30D. The refrigerant is then led to the rotary compression mechanism 6A. Thus, in the motor space S4, the refrigerant is at a low pressure, which is equal to the suction pressure.

[0074] In the rotary compression mechanism 6A, the refrigerant is compressed by a piston rotor 63 that rotates together with the rotary shaft 3D. The compressed high-pressure refrigerant is guided from the rotary compression mechanism 6A to a high-pressure storage chamber 69, and then discharged from the discharge pipe 17 to the outside of the compressor 1D.

[0075] 5, a portion of the high-pressure refrigerant guided to the high-pressure reservoir 69 is guided to the blade chamber 75 via the communication passage 77. This causes the blade chamber 75 to become highly pressurized, and this pressure urges the rear ends of the blades 72 toward the leading ends.

[0076] The effects of the present embodiment described above are as follows. When the three factors of pressure, temperature, and ignition energy are met, HFO refrigerants containing R1123 or R1132(E) or mixed refrigerants containing the HFO refrigerants may cause a disproportionation reaction. Therefore, the pressure in the motor space S4 including the winding 53D of the electric motor 5D is set to 6 MPa or less. This makes it possible to suppress the disproportionation reaction of the HFO refrigerant as much as possible.

[0077] The rotary compression mechanism 6A is configured to draw the refrigerant from the motor space S4, which serves as a space equivalent to the suction pressure, that is, a low-pressure space, so that the motor space S4 can be set to 6 MPa or less.

[0078] The blades 72 are biased toward the tip end side (toward the piston rotor 63) by the pressure of the blade chamber 75 in addition to the pressing force of the spring 74. To assist this, it is preferable to introduce high-pressure refrigerant compressed by the rotary compression mechanism 6A to the blade chamber 75. However, since the motor space S4 into which the rotary compression mechanism 6A draws the refrigerant has a low-pressure housing structure in which the pressure is low, the high-pressure refrigerant cannot be introduced from the periphery of the rotary compression mechanism 6A to the blade chamber 75. Therefore, a communication passage 77 is provided that communicates the blade chamber 75 with the high-pressure storage chamber 69 that temporarily stores the high-pressure refrigerant compressed by the rotary compression mechanism 6A. This makes it possible to make the blade chamber 75 high pressure, and ensure the biasing force of the blades 72.

[0079] The demagnetization temperature of the neodymium magnet used in the electric motor 5D is set to 120°C to 150°C, and when it exceeds 150°C, thermal demagnetization occurs and operation as the electric motor 5D is suppressed (or stopped). This makes it possible to avoid continued operation of the electric motor 5D at temperatures exceeding 150°C, thereby suppressing the disproportionation reaction of the refrigerant.

[0080] In the above-described embodiment, a configuration in which the demagnetization temperature of the neodymium magnet is set to 120°C or higher and 150°C or lower has been described in conjunction with setting the motor spaces S1, S2, S3, and S4 to 6 MPa or lower. However, a configuration in which the demagnetization temperature of the neodymium magnet is set to 120°C or higher and 150°C or lower can also be applied to compressors in which the motor space exceeds 6 MPa.

[0081] The compressor and the compression system described in each of the above-described embodiments can be understood, for example, as follows.

[0082] A compressor (1C) according to a first aspect of the present disclosure includes a housing (2C) through which a refrigerant flows, a compression section (6A, 6B) provided inside the housing and configured to compress the refrigerant, and an electric motor (5C) provided inside the housing and configured to drive the compression section, the refrigerant being an HFO refrigerant containing R1123 or R1132(E) or a mixed refrigerant containing the HFO refrigerant, a pressure in a motor space (S3) including a winding (53C) of the electric motor is set to 6 MPa or less, and the compressor ( 1C) in the first aspect, the compression section includes a rotary compression mechanism (6A) provided at one end of the housing and a scroll compression mechanism (6B) provided at the other end of the housing, the motor space (S3) is disposed between the rotary compression mechanism and the scroll compression mechanism, the rotary compression mechanism discharges the refrigerant compressed by the rotary compression mechanism into the motor space, and the scroll compression mechanism sucks in the refrigerant from the motor space and compresses it.

[0083] HFO refrigerants containing R1123 or R1132(E) or mixed refrigerants containing the HFO refrigerants may undergo disproportionation reactions when the three conditions of pressure, temperature, and ignition energy are met. Therefore, the pressure in the motor space including the windings of the electric motor is set to 6 MPa or less. This makes it possible to suppress disproportionation reactions of the HFO refrigerant as much as possible. Examples of HFO refrigerants or mixed refrigerants containing the HFO refrigerants include R474A (a mixed refrigerant of R1132(E) and R1234yf) and R479A (a mixed refrigerant containing R1132(E), R1234yf, and R32). A motor space is provided between the rotary compression mechanism and the scroll compression mechanism, and the refrigerant compressed by the rotary compression mechanism is discharged into the motor space, and the scroll compression mechanism draws in and compresses the refrigerant from the motor space. This allows the motor space to be at an intermediate pressure between the low pressure at which the rotary compression mechanism draws in the refrigerant and the high pressure at which the scroll compression mechanism discharges the refrigerant, and the motor space can be set to 6 MPa or less.

[0084] A compressor (1D) according to a second aspect of the present disclosure includes a housing (2D) through which a refrigerant flows, a compression unit (6A) provided inside the housing and compressing the refrigerant, and an electric motor (5D) provided inside the housing and driving the compression unit, wherein the refrigerant is an HFO refrigerant including R1123 or R1132(E) or a mixed refrigerant including the HFO refrigerant, a pressure of a motor space (S4) including a winding (53D) of the electric motor is set to 6 MPa or less, and the compression unit includes a rotary compression mechanism (6A), which draws the refrigerant from the motor space (S4), compresses it, and then discharges it to the outside of the housing (2D).

[0085] HFO refrigerants containing R1123 or R1132(E) or mixed refrigerants containing the HFO refrigerants may undergo disproportionation reactions when the three conditions of pressure, temperature, and ignition energy are met. Therefore, the pressure in the motor space including the windings of the electric motor is set to 6 MPa or less. This makes it possible to suppress disproportionation reactions of the HFO refrigerant as much as possible. Examples of HFO refrigerants or mixed refrigerants containing the HFO refrigerants include R474A (a mixed refrigerant of R1132(E) and R1234yf) and R479A (a mixed refrigerant containing R1132(E), R1234yf, and R32). The rotary compression mechanism is configured to draw in the refrigerant from the motor space, making the motor space a space equivalent to the suction pressure, i.e., a low-pressure space, allowing the motor space to be kept at 6 MPa or less.

[0086] A compressor (1D) according to a third aspect of the present disclosure is the rotary compression mechanism of the second aspect, which includes a compression chamber (61) formed as a cylindrical space, a piston rotor (63) rotating eccentrically inside the compression chamber, a blade (72) whose tip end contacts the outer peripheral surface of the piston rotor to form a pressure partition, a spring (74) that urges the blade toward the tip end, a blade chamber (75) that accommodates the rear end of the blade, and a high-pressure storage chamber (69) that temporarily stores the refrigerant compressed in the compression chamber, and a communication passage (77) that communicates between the high-pressure storage chamber and the blade chamber.

[0087] The blades are biased toward the tip end (rotor side) by the pressure in the blade chamber in addition to the pressing force of the spring. To assist this, it is preferable to introduce high-pressure refrigerant compressed by the rotary compression mechanism into the blade chamber. However, because the motor space where the rotary compression mechanism draws in the refrigerant is at low pressure, it is not possible to introduce high-pressure refrigerant from around the rotary compression mechanism into the blade chamber. Therefore, a communication passage is provided that connects the blade chamber to a high-pressure storage chamber that temporarily stores high-pressure refrigerant compressed by the rotary compression mechanism. This makes it possible to create high pressure in the blade chamber and ensure the biasing force of the blades.

[0088] A compressor (1A, 1B, 1C, 1D) according to a fourth aspect of the present disclosure is any one of the first to third aspects, in which the electric motor is equipped with a neodymium magnet, and the demagnetization temperature of the neodymium magnet is 120°C or higher and 150°C or lower.

[0089] HFO refrigerants containing R1123 or R1132(E) or mixed refrigerants containing such HFO refrigerants may undergo disproportionation reactions when they exceed 150°C. Therefore, the demagnetization temperature of neodymium magnets used in electric motors is set to 150°C or lower (120°C or higher), and when the temperature exceeds 150°C, thermal demagnetization occurs and operation as an electric motor is suppressed (or stopped). This makes it possible to avoid continued operation of an electric motor at temperatures above 150°C, thereby suppressing the disproportionation reactions of the refrigerant.

[0090] A compressor system (1) according to a first aspect of the present disclosure includes a rotary compressor (1A) that compresses a refrigerant, and a scroll compressor (1B) that sucks in and compresses the refrigerant discharged from the rotary compressor. The rotary compressor includes a first housing through which the refrigerant flows, a rotary compression section provided inside the first housing and compressing the refrigerant, a first electric motor provided inside the first housing and driving the rotary compression section, and a first motor space into which the refrigerant compressed by the rotary compression section is guided and which includes a winding of the first electric motor. The scroll compressor includes an internal the first motor space includes a second housing through which a refrigerant flows, a scroll compression section provided inside the second housing and compressing the refrigerant, a second electric motor provided inside the second housing and driving the scroll compression section, and a second motor space to which refrigerant discharged from the rotary compressor is guided and which is provided on the refrigerant suction side of the scroll compression section and includes a winding of the second electric motor, the refrigerant being an HFO refrigerant including R1123 or R1132(E) or a mixed refrigerant including an HFO refrigerant, and the pressure in the first motor space and the second motor space is 6 MPa or less.

[0091] The refrigerant compressed by the rotary compression mechanism passes through the first motor space and is discharged from the rotary compressor. The refrigerant discharged from the rotary compressor is guided to the scroll compressor, passes through the second motor space and is compressed by the scroll compression mechanism. This allows the first motor space and the second motor space to be at an intermediate pressure between the low pressure at which the rotary compressor sucks in the refrigerant and the high pressure at which the scroll compressor discharges the refrigerant, and allows the first motor space and the second motor space to be at 6 MPa or less.

[0092] A compressor (1A, 1B, 1C, 1D) according to a fifth aspect of the present disclosure includes a housing through which a refrigerant flows, a compression section provided inside the housing for compressing the refrigerant, and an electric motor provided inside the housing for driving the compression section, wherein the refrigerant is an HFO refrigerant containing R1123 or R1132(E) or a mixed refrigerant containing an HFO refrigerant, and the electric motor includes a neodymium magnet, and the demagnetization temperature of the neodymium magnet is 120°C or higher and 150°C or lower.

[0093] HFO refrigerants containing R1123 or R1132(E) or mixed refrigerants containing such HFO refrigerants may undergo disproportionation reactions when they exceed 150°C. Therefore, the demagnetization temperature of neodymium magnets used in electric motors is set to 150°C or lower (120°C or higher), and when the temperature exceeds 150°C, thermal demagnetization occurs and operation as an electric motor is suppressed (or stopped). This makes it possible to avoid continued operation of an electric motor at temperatures above 150°C, thereby suppressing the disproportionation reactions of the refrigerant. [Explanation of symbols]

[0094] 1 Compressor System 1A Rotary Compressor 1B Scroll Compressor 2A Housing (1st Housing) 2B Housing (Second Housing) 2C Housing 3A Rotating shaft 3B Rotating shaft 3C Rotating shaft 5A electric motor (first electric motor) 5B Electric motor (second electric motor) 5C electric motor 6A Rotary compression mechanism (compression section) 6B Scroll compression mechanism (compression section) 11 Suction pipe 12 Accumulator 13 Discharge pipe 15 Inlet pipe 16 Suction pipe 17 Discharge pipe 30A power supply terminal 30B Power supply terminal 30C Power supply terminal 32A Wiring 32B Wiring 32C Wiring 51A Rotor 51B rotor 51C rotor 52A Stator 52B Stator 52C Stator 53A winding 53B Winding 53C Winding 61 Compression Chamber 63 Piston rotor 64 Swirling Scroll 65 Fixed Scroll 66 Discharge cover 69 High Pressure Storage Chamber 70A Upper Bearing 70B Lower Bearing 72 Blade 74 Spring 75 Blade Room 77 Communication path S1 First motor space S2 Second motor space S3 Motor Space S4 Motor space

Claims

1. A housing through which a refrigerant flows; a compression unit provided inside the housing and configured to compress a refrigerant; an electric motor provided inside the housing and configured to drive the compression unit; Equipped with The refrigerant is an HFO refrigerant containing R1123 or R1132(E) or a mixed refrigerant containing the HFO refrigerant, The pressure in the motor space including the windings of the electric motor is set to 6 MPa or less, The compression unit includes a rotary compression mechanism provided at one end of the housing and a scroll compression mechanism provided at the other end of the housing, the motor space is disposed between the rotary compression mechanism and the scroll compression mechanism, The rotary compression mechanism discharges the refrigerant compressed by the rotary compression mechanism into the motor space, The scroll compression mechanism is a compressor that draws in the refrigerant from the motor space and compresses it.

2. A housing through which a refrigerant flows; a compression unit provided inside the housing and configured to compress a refrigerant; an electric motor provided inside the housing and configured to drive the compression unit; Equipped with The refrigerant is an HFO refrigerant containing R1123 or R1132(E) or a mixed refrigerant containing the HFO refrigerant, The pressure in the motor space including the windings of the electric motor is set to 6 MPa or less, The compression unit includes a rotary compression mechanism. The rotary compression mechanism is a compressor that draws in the refrigerant from the motor space, compresses it, and then discharges it to the outside of the housing.

3. the rotary compression mechanism includes a compression chamber formed as a cylindrical space, a piston rotor which rotates eccentrically inside the compression chamber, a blade whose tip end contacts an outer circumferential surface of the piston rotor to form a pressure partition, a spring which biases the blade toward the tip end, a blade chamber which houses a rear end of the blade, and a high-pressure storage chamber which temporarily stores the refrigerant compressed in the compression chamber, 3. The compressor according to claim 2, further comprising a communication passage for communicating between the high pressure reservoir chamber and the blade chamber.

4. The electric motor includes a neodymium magnet.

3. The compressor according to claim 1, wherein the demagnetization temperature of the neodymium magnet is 120° C. or higher and 150° C. or lower.

5. A rotary compressor that compresses a refrigerant; a scroll compressor that draws in and compresses the refrigerant discharged from the rotary compressor; Equipped with The rotary compressor includes: a first housing through which a refrigerant flows; a rotary compression unit provided inside the first housing and configured to compress a refrigerant; a first electric motor provided inside the first housing and configured to drive the rotary compression unit; a first motor space into which the refrigerant compressed in the rotary compression portion is guided and which includes a winding of the first electric motor; Equipped with The scroll compressor comprises: a second housing through which a refrigerant flows; a scroll compression section provided inside the second housing and configured to compress a refrigerant; a second electric motor provided inside the second housing and configured to drive the scroll compression unit; a second motor space into which the refrigerant discharged from the rotary compressor is guided and which is provided on a refrigerant intake side of the scroll compression section and which includes a winding of the second electric motor; Equipped with The refrigerant is an HFO refrigerant containing R1123 or R1132(E) or a mixed refrigerant containing the HFO refrigerant, A compressor system, wherein the pressure in the first motor space and the second motor space is 6 MPa or less.

6. A housing through which a refrigerant flows; a compression unit provided inside the housing and configured to compress a refrigerant; an electric motor provided inside the housing and configured to drive the compression unit; Equipped with The refrigerant is an HFO refrigerant containing R1123 or R1132(E) or a mixed refrigerant containing the HFO refrigerant, The electric motor includes a neodymium magnet. The demagnetization temperature of the neodymium magnet is 120°C or higher and 150°C or lower.

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