Compressor and compressor system

Abstract

Provided is a compressor capable of suppressing disproportionation reaction of HFO refrigerant as much as possible. A compressor (1D) comprises: a housing (2D) in which a refrigerant flows; a rotary compression mechanism (6A) that is provided inside the housing (2D) and compresses the refrigerant; and an electric motor (5D) that is provided inside the housing (2D) and drives the rotary compression mechanism (6A). The refrigerant is an HFO refrigerant containing R1123 or R1132 (E) or a mixed refrigerant containing the HFO refrigerant, and a pressure of a motor space (S4) containing a winding (53D) of the electric motor (5D) is set to 6 MPa or less. The rotary compression mechanism (6A) sucks the refrigerant from the motor space (S4), compresses the refrigerant, and then discharges the refrigerant to the outside of the housing (2D).

Description

Technical Field

[0001] The present disclosure relates to a compressor and a compressor system that use an HFO refrigerant or a mixed refrigerant containing an HFO refrigerant.Background Art

[0002] As a low global warming potential (GWP) refrigerant, a hydro fluoro olefin (HFO) refrigerant containing R1123 or R1132 (E) is known.

[0003] The HFO refrigerant has lower stability than a conventional working medium such as R410A, and pressure increases with large heat release due to a disproportionation reaction, which may reduce reliability of the compressor.

[0004] In PTL 1, a communication unit that communicates a compressor accommodation space and a space outside the compressor accommodation space is provided in an outdoor unit of an air conditioner that accommodates a compressor, and in a case where a disproportionation reaction occurs in the compressor, the compressor is damaged, and a working medium is emitted and diffused as soot in the compressor accommodation space, the soot is discharged from the communication unit to the outside of the outdoor unit.Citation ListPatent Literature

[0005] [PTL 1] Japanese Patent No. 7149494Summary of InventionTechnical Problem

[0006] PTL 1 is effective as a measure in a case where a disproportionation reaction occurs in the compressor. However, it is more preferable to suppress the disproportionation reaction that may occur in the compressor as much as possible.

[0007] The present disclosure has been made in view of such circumstances, and an object of the present disclosure is to provide a compressor and a compressor system that can suppress a disproportionation reaction of an HFO refrigerant or a mixed refrigerant containing an HFO refrigerant as much as possible.Solution to Problem

[0008] According to an aspect of the present disclosure, a compressor includes a housing in which a refrigerant flows, a compression unit that is provided inside the housing and compresses the refrigerant, and an electric motor that is provided inside the housing and drives the compression unit, 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 sucks the refrigerant from the motor space and compresses the refrigerant.

[0009] According to an aspect of the present disclosure, a compressor includes a housing in which a refrigerant flows, a compression unit that is provided inside the housing and compresses the refrigerant, and an electric motor that is provided inside the housing and drives the compression unit, 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, and the rotary compression mechanism sucks the refrigerant from the motor space, compresses the refrigerant, and then discharges the refrigerant to an outside of the housing.

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

[0011] According to an aspect of the present disclosure, a compressor includes a housing in which a refrigerant flows, a compression unit that is provided inside the housing and compresses the refrigerant, and an electric motor that is provided inside the housing and drives the compression unit, 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, and a demagnetization temperature of the neodymium magnet is 120°C or higher and 150°C or lower.Advantageous Effects of Invention

[0012] A disproportionation reaction of an HFO refrigerant or a mixed refrigerant containing an HFO refrigerant can be suppressed as much as possible.Brief Description of Drawings

[0013] FIG. 1 is a longitudinal cross-sectional view showing a compressor system according to a first embodiment of the present disclosure. FIG. 2 is a longitudinal cross-sectional view of a compressor according to a second embodiment of the present disclosure. FIG. 3 is a longitudinal cross-sectional view of a compressor according to a third embodiment of the present disclosure. FIG. 4 is a plan view of a rotary compression mechanism in which a compression chamber of FIG. 3 is viewed in a plan view. FIG. 5 is an enlarged longitudinal cross-sectional view showing a blade chamber of FIG. 4. Description of Embodiments

[0014] Hereinafter, an embodiment according to the present disclosure will be described with reference to the drawings.[First Embodiment]

[0015] Hereinafter, a first embodiment of the present disclosure will be described.

[0016] FIG. 1 shows a compressor system 1 according to the present embodiment. The compressor system 1 includes a rotary compressor 1A and a scroll compressor 1B. The compressor system 1 is a two-stage compression in which the refrigerant compressed by the rotary compressor 1A is guided to the scroll compressor 1B and further compressed.

[0017] As the refrigerant, a hydro fluoro olefin (HFO) refrigerant is used, and examples thereof contain R474A (a mixed refrigerant of R1132 (E) and R1234yf) and R479A (a mixed refrigerant containing R1132 (E), R1234yf, and R32). In such an HFO refrigerant or a mixed refrigerant containing the HFO refrigerant, a disproportionation reaction with large heat release occurs in a case where pressure, temperature, and ignition energy are all present. The pressure, the temperature, and the ignition energy at which the disproportionation reaction occurs are, for example, 6 MPa, 150°C, and 30 J, respectively.

[0018] The rotary compressor 1A is, for example, a sealed-type electric rotary compressor used in an air conditioner, a refrigerating apparatus, or the like. The rotary compressor 1A includes a compressor main body 10A and an accumulator 12. The accumulator 12 includes an inlet pipe 15 that introduces the refrigerant to an upper portion thereof, and is connected to the compressor main body 10A via a suction pipe 11.

[0019] The compressor main body 10A includes a housing (first housing) 2A having a substantially cylindrical shape, a rotary shaft body 3A, an electric motor (first electric motor) 5A, and a rotary compression mechanism (compression unit) 6A.

[0020] A discharge pipe 13 and a power supply terminal 30A are provided at an upper portion of the housing 2A. The discharge pipe 13 discharges the compressed refrigerant to the outside of the housing 2A. The power supply terminals 30A are supplied with three-phase power from an inverter device (not shown). Power is supplied to the electric motor 5A from the power supply terminal 30A via a wiring 32A.

[0021] The electric motor 5A is accommodated in a center portion of the housing 2A in an up-down direction. The electric motor 5A includes a rotor 51A and a stator 52A. The rotor 51A is fixed to an outer peripheral surface of the rotary shaft body 3A and is disposed above the rotary compression mechanism 6A. The stator 52A is disposed to surround the outer peripheral surface of the rotor 51A and is fixed to an inner surface of the housing 2A.

[0022] A neodymium magnet is used as the rotor 51A. A demagnetization temperature of the neodymium magnet is 120°C or higher and 150°C or lower.

[0023] The stator 52A includes a winding 53A. A space including the winding 53A is a first motor space S1. A pressure in the first motor space S1 is 6 MPa or less.

[0024] Power is supplied to the winding 53A of the stator 52A from the power supply terminal 30A via the wiring 32A. The electric motor 5A rotates the rotary shaft body 3A by the supplied power.

[0025] The rotary compression mechanism 6A is disposed below the electric motor 5A and at a bottom portion of the housing 2A. The rotary compression mechanism 6A is provided in two stages in the up-down direction, and includes a piston rotor 63 in a compression chamber 61 that is a cylindrical space. The piston rotor 63 eccentrically rotates in the compression chamber 61 by the rotary shaft body 3A.

[0026] The scroll compressor 1B is, for example, a sealed-type electric scroll compressor used in an air conditioner, a refrigerating apparatus, or the like. The scroll compressor 1B includes a compressor main body 10B.

[0027] The compressor main body 10B includes a housing (second housing) 2B having a substantially cylindrical shape, a rotary shaft body 3B, an electric motor (second electric motor) 5B, and a scroll compression mechanism (compression unit) 6B.

[0028] A suction pipe 16 and a power supply terminal 30B are provided below the scroll compression mechanism 6B of the housing 2B. The suction pipe 16 sucks the refrigerant compressed by the rotary compressor 1A into the housing 2B. The power supply terminals 30B are supplied with three-phase power from an inverter device (not shown). Power is supplied to the electric motor 5B from the power supply terminal 30B via a wiring 32B.

[0029] 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.

[0030] The electric motor 5B is accommodated in a center portion of the housing 2B in the up-down direction. The electric motor 5B includes a rotor 51B and a stator 52B. The rotor 51B is fixed to an outer peripheral surface of the rotary shaft body 3B and is disposed below the scroll compression mechanism 6B. The stator 52B is disposed to surround the outer peripheral surface of the rotor 51B and is fixed to an inner surface of the housing 2B.

[0031] A neodymium magnet is used as the rotor 51B. A demagnetization temperature of the neodymium magnet is 120°C or higher and 150°C or lower.

[0032] The stator 52B includes a winding 53B. A space including the winding 53B is a second motor space S2. A pressure in the second motor space S2 is 6 MPa or less.

[0033] Power is supplied to the stator 52B from the power supply terminal 30B via the wiring 32B. The electric motor 5B rotates the rotary shaft body 3B by the supplied power.

[0034] The scroll compression mechanism 6B is disposed above the electric motor 5B and at an upper portion of the housing 2B. The scroll compression mechanism 6B includes an orbiting scroll 64 that performs an orbiting revolution movement by the rotary shaft body 3B and a fixed scroll 65 that meshes with the orbiting scroll 64 to form a compression chamber.

[0035] The compressor system 1 operates as follows.

[0036] In FIG. 1, a flow of the refrigerant is indicated by a thick arrow.

[0037] The refrigerant is guided from, for example, an evaporator (not shown) and flows into the accumulator 12 from the inlet pipe 15. The refrigerant in a gas phase separated into gas and liquid in the accumulator 12 is guided to the rotary compression mechanism 6A through the suction pipe 11 of the rotary compressor 1A. In the rotary compression mechanism 6A, the refrigerant is compressed by the piston rotor 63 that rotates together with the rotary shaft body 3A. The compressed refrigerant is discharged from the rotary compression mechanism 6A into the first motor space S1 in the housing 2A.

[0038] The refrigerant flowing into the first motor space S1 flows upward through a through-hole or the like formed in the rotor 51A. In this case, the refrigerant flows through a periphery of the winding 53A or a periphery of the power supply terminal 30A. Thereafter, the refrigerant is discharged to the outside of the rotary compressor 1A through the discharge pipe 13.

[0039] The refrigerant discharged from the rotary compressor 1A is guided to the suction pipe 16 of the scroll compressor 1B through a connection pipe (not shown) as indicated by a thick arrow. The refrigerant flowing into the housing 2B from the suction pipe 16 is guided to the scroll compression mechanism 6B through a periphery of the winding 53B or a periphery of the power supply terminal 30B.

[0040] In the scroll compression mechanism 6B, the refrigerant is compressed in the compression chamber formed by the orbiting scroll 64 and the fixed scroll 65 and is discharged to the outside of the scroll compressor 1B from the discharge pipe 17.

[0041] The operations and effects of the present embodiment described above are as follows.

[0042] In the HFO refrigerant containing R1123 or R1132 (E) or the mixed refrigerant containing the HFO refrigerant, there is a concern that a disproportionation reaction may occur in a case where the three conditions of pressure, temperature, and ignition energy are all present. Therefore, the pressure in the motor spaces S1 and S2 including the windings 53A and 53B of the electric motors 5A and 5B is set to 6 MPa or less. As a result, the disproportionation reaction of the HFO refrigerant can be suppressed as much as possible.

[0043] The refrigerant compressed by the rotary compression mechanism 6A is discharged from the rotary compressor 1A through the first motor space S1. The refrigerant discharged from the rotary compressor 1A is guided to the scroll compressor 1B and is compressed by the scroll compression mechanism 6B through the second motor space S2. As a result, the first motor space S1 and the second motor space S2 can be set to an intermediate pressure between a low pressure at which the rotary compressor 1A sucks the refrigerant and a high pressure at which the scroll compressor 1B discharges the refrigerant, and the first motor space S1 and the second motor space S2 can be set to 6 MPa or less. As a result, the disproportionation reaction of the HFO refrigerant can be suppressed as much as possible even in a case where the windings 53A and 53B or the wirings 32A and 32B are short-circuited.

[0044] The demagnetization temperature of the neodymium magnet used in the electric motors 5A and 5B is set to 120°C or higher and 150°C or lower, and in a case where the temperature exceeds 150°C, thermal demagnetization occurs to suppress (or stop) the operation of the electric motors 5A and 5B. As a result, the electric motors 5A and 5B can be prevented from being continuously operated at a temperature exceeding 150°C, so that the disproportionation reaction of the refrigerant can be suppressed.[Second Embodiment]

[0045] Next, a second embodiment of the present disclosure will be described.

[0046] FIG. 2 shows a compressor 1C according to the present embodiment. The compressor 1C includes the rotary compression mechanism 6A and the scroll compression mechanism 6B in a housing 2C. The rotary compression mechanism 6A is disposed at a bottom portion (one end) of the housing 2C, and the scroll compression mechanism 6B is disposed at an upper portion (the other end) of the housing 2C.

[0047] As the refrigerant, a hydro fluoro olefin (HFO) refrigerant or a mixed refrigerant containing the HFO refrigerant is used, and examples thereof contain R474A (a mixed refrigerant of R1132 (E) and R1234yf) and R479A (a mixed refrigerant containing R1132 (E), R1234yf, and R32). In such an HFO refrigerant or a mixed refrigerant containing the HFO refrigerant, a disproportionation reaction with large heat release occurs in a case where pressure, temperature, and ignition energy are all present. The pressure, the temperature, and the ignition energy at which the disproportionation reaction occurs are, for example, 6 MPa, 150°C, and 30 J, respectively.

[0048] 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 an outer peripheral surface of a rotary shaft body 3C and is disposed above the rotary compression mechanism 6A. The stator 52C is disposed to surround the outer peripheral surface of the rotor 51C and is fixed to an inner surface of the housing 2C.

[0049] The rotary shaft body 3B extends in both the downward and upward directions of the electric motor 5C. The piston rotor 63 is rotated at a lower end of the rotary shaft body 3B, and the orbiting scroll 64 is rotated at an upper end thereof.

[0050] A neodymium magnet is used as the rotor 51C. A demagnetization temperature of the neodymium magnet is 120°C or higher and 150°C or lower.

[0051] The stator 52C includes a winding 53C. A space including the winding 53C is a motor space S3. A pressure in the motor space S3 is 6 MPa or less.

[0052] Power is supplied to the winding 53C of the stator 52C from a power supply terminal 30C. The electric motor 5C rotates the rotary shaft body 3C by the supplied power.

[0053] The rotary compression mechanism 6A is disposed below the electric motor 5C and at a bottom portion of the housing 2C. The rotary compression mechanism 6A includes a piston rotor 63 in a compression chamber 61 that is a cylindrical space. The piston rotor 63 eccentrically rotates in the compression chamber 61 by the rotary shaft body 3C.

[0054] The scroll compression mechanism 6B is disposed above the electric motor 5C and at an upper portion of the housing 2C. The scroll compression mechanism 6B includes an orbiting scroll 64 that performs an orbiting revolution movement by the rotary 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. A lower end of the discharge pipe 17 is connected to an upper end of the discharge cover 66.

[0055] The power supply terminal 30C is provided at an upper portion of the housing 2C. The upper portion of the housing 2C in which the power supply terminal 30C is provided and the wiring 32C is disposed is partitioned by the discharge cover 66 of the scroll compression mechanism 6B. Therefore, the upper portion of the housing 2C is not the pressure of the high-pressure refrigerant discharged from the scroll compression mechanism 6B, but has the same pressure (intermediate pressure) as the motor space S3.

[0056] The compressor 1C operates as follows.

[0057] In FIG. 2, a flow of the refrigerant is indicated by a thick arrow.

[0058] The refrigerant is guided from, for example, an evaporator (not shown) and flows into the accumulator 12 from the inlet pipe 15. The refrigerant in a gas phase separated into gas and liquid in the accumulator 12 is guided to the rotary compression mechanism 6A through the suction pipe 11. In the rotary compression mechanism 6A, the refrigerant is compressed by the piston rotor 63 that rotates together with the rotary shaft body 3C. The compressed refrigerant is discharged from the rotary compression mechanism 6A into the motor space S3 located at the center of the housing 2C.

[0059] The refrigerant flowing into the motor space S3 flows upward through a through-hole or the like formed in the rotor 51C. In this case, the refrigerant flows through a periphery of the winding 53C or a periphery of the wiring 32C guided from the power supply terminal 30C. Thereafter, the refrigerant is guided to the scroll compression mechanism 6B.

[0060] In the scroll compression mechanism 6B, the refrigerant is compressed in the compression chamber formed by the orbiting scroll 64 and the fixed scroll 65 and is discharged to the outside of the compressor 1C from the discharge pipe 17.

[0061] The operations and effects of the present embodiment described above are as follows.

[0062] In the HFO refrigerant containing R1123 or R1132 (E) or the mixed refrigerant containing the HFO refrigerant, there is a concern that a disproportionation reaction may occur in a case where the three conditions of pressure, temperature, and ignition energy are all present. Therefore, the pressure in the motor space S3 including the winding 53C of the electric motor 5C is set to 6 MPa or less. As a result, the disproportionation reaction of the HFO refrigerant can be suppressed as much as possible.

[0063] The motor space S3 is provided between the rotary compression mechanism 6A and the scroll compression mechanism 6B, the refrigerant compressed by the rotary compression mechanism 6A is discharged into the motor space S3, and the scroll compression mechanism 6B sucks the refrigerant from the motor space S3 and compresses the refrigerant. As a result, the motor space S3 can be set to an intermediate pressure between a low pressure at which the rotary compression mechanism 6A sucks the refrigerant and a 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. As a result, the disproportionation reaction of the HFO refrigerant can be suppressed as much as possible even in a case where the winding 53C or the wiring 32C is short-circuited.

[0064] The demagnetization temperature of the neodymium magnet used in the electric motor 5C is set to 120°C or higher and 150°C or lower, and in a case where the temperature exceeds 150°C, thermal demagnetization occurs to suppress (or stop) the operation of the electric motor 5C. As a result, the electric motor 5C can be prevented from being continuously operated at a temperature exceeding 150°C, so that the disproportionation reaction of the refrigerant can be suppressed.[Third Embodiment]

[0065] Next, a third embodiment of the present disclosure will be described.

[0066] FIG. 3 shows a compressor 1D according to the present embodiment. As the refrigerant used in the compressor 1D, a hydro fluoro olefin (HFO) refrigerant or a mixed refrigerant containing the HFO refrigerant is used, and examples thereof contain R474A (a mixed refrigerant of R1132 (E) and R1234yf) and R479A (a mixed refrigerant containing R1132 (E), R1234yf, and R32). In such an HFO refrigerant or a mixed refrigerant containing the HFO refrigerant, a disproportionation reaction with large heat release occurs in a case where pressure, temperature, and ignition energy are all present. The pressure, the temperature, and the ignition energy at which the disproportionation reaction occurs are, for example, 6 MPa, 150°C, and 30 J, respectively.

[0067] The compressor 1D is, for example, a sealed-type electric rotary compressor used in an air conditioner, a refrigerating apparatus, or the like. The compressor 1D includes a housing 2D having a substantially cylindrical shape, a rotary shaft body 3D, an electric motor 5D, and a rotary compression mechanism (compression unit) 6A.

[0068] The suction pipe 11 and a power supply terminal 30D are provided at an upper portion of the housing 2D. The low-pressure refrigerant guided from the evaporator or the like is guided into the housing 2D from the suction pipe 11. The power supply terminals 30D are supplied with three-phase power from an inverter device (not shown). Power is supplied to the electric motor 5D from the power supply terminal 30D via a wiring 32D.

[0069] The electric motor 5D is accommodated in a center portion of the housing 2D in the up-down direction. The electric motor 5D includes a rotor 51D and a stator 52D. The rotor 51D is fixed to an outer peripheral surface of the rotary shaft body 3D and is disposed above the rotary compression mechanism 6A. The stator 52D is disposed to surround the outer peripheral surface of the rotor 51D and is fixed to an inner surface of the housing 2D.

[0070] A neodymium magnet is used as the rotor 51D. A demagnetization temperature of the neodymium magnet is 120°C or higher and 150°C or lower.

[0071] The stator 52D includes a winding 53D. A space including the winding 53D is a motor space S4. A pressure in the motor space S4 is 6 MPa or less.

[0072] Power is supplied to the winding 53D of the stator 52D from the power supply terminal 30D via the wiring 32D. The electric motor 5D rotates the rotary shaft body 3D by the supplied power.

[0073] The rotary compression mechanism 6A is disposed below the electric motor 5D and at a bottom portion of the housing 2D. The rotary compression mechanism 6A includes a piston rotor 63 in a compression chamber 61 that is a cylindrical space. The piston rotor 63 eccentrically rotates in the compression chamber 61 by the rotary shaft body 3D.

[0074] The rotary compression mechanism 6A is disposed in a state of being sandwiched from above and below by an upper bearing 70A and a lower bearing 70B. The rotary shaft body 3D is rotatably supported by the upper bearing 70A and the lower bearing 70B.

[0075] A high-pressure storage chamber 69 in which the high-pressure refrigerant compressed by the piston rotor 63 is temporarily stored is formed between the compression chamber 61 and the upper bearing 70A. The high-pressure refrigerant is discharged from the discharge pipe 17 to the outside of the compressor 1D through the high-pressure storage chamber 69.

[0076] FIG. 4 is a plan view of the rotary compression mechanism 6A as viewed from above the compression chamber 61. A tip end portion of a blade 72 is in contact with an outer peripheral surface of the piston rotor 63. The blade 72 partitions the compression chamber 61 to form a pressure partition wall.

[0077] A spring 74 that biases the blade 72 in a direction of the tip end portion is provided on a rear end side of the blade 72. The spring 74 is provided in a blade chamber 75 that accommodates a rear end portion of the blade 72.

[0078] As shown in FIG. 5, a communication passage 77 is provided between the blade chamber 75 and the high-pressure storage chamber 69. The high-pressure refrigerant is guided from the high-pressure storage chamber 69 to the blade chamber 75 through the communication passage 77.

[0079] The compressor 1D operates as follows.

[0080] In FIG. 3, a flow of the refrigerant is indicated by a thick arrow.

[0081] 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.

[0082] The refrigerant flowing into the motor space S4 flows downward through a through-hole or the like formed in the rotor 51A. In this case, the refrigerant flows through a periphery of the winding 53D or a periphery of the wiring 32D guided from the power supply terminal 30D. Thereafter, the refrigerant is guided to the rotary compression mechanism 6A. As described above, the refrigerant in the motor space S4 has the same pressure as the suction pressure and is set to a low pressure.

[0083] In the rotary compression mechanism 6A, the refrigerant is compressed by the piston rotor 63 that rotates together with the rotary shaft body 3D. The compressed high-pressure refrigerant is guided from the rotary compression mechanism 6A to the high-pressure storage chamber 69 and is discharged from the discharge pipe 17 to the outside of the compressor 1D.

[0084] A part of the high-pressure refrigerant guided to the high-pressure storage chamber 69 is guided to the blade chamber 75 through the communication passage 77 as shown in FIG. 5. As a result, the blade chamber 75 has a high pressure, and the rear end portion of the blade 72 is biased toward the tip end portion by this pressure.

[0085] The operations and effects of the present embodiment described above are as follows.

[0086] In the HFO refrigerant containing R1123 or R1132 (E) or the mixed refrigerant containing the HFO refrigerant, there is a concern that a disproportionation reaction may occur in a case where the three conditions of pressure, temperature, and ignition energy are all present. Therefore, the pressure in the motor space S4 including the winding 53D of the electric motor 5D is set to 6 MPa or less. As a result, the disproportionation reaction of the HFO refrigerant can be suppressed as much as possible.

[0087] By adopting a configuration in which the rotary compression mechanism 6A sucks the refrigerant from the motor space S4, the motor space S4 is set to a space corresponding to the suction pressure, that is, a low-pressure space. As a result, the motor space S4 can be set to 6 MPa or less.

[0088] The blade 72 is biased toward the tip end portion side (the piston rotor 63 side) by the pressure of the blade chamber 75 in addition to the pressing force of the spring 74. As the assist, it is preferable to guide the 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 sucks the refrigerant is a low-pressure housing structure in which the pressure is low, high-pressure refrigerant cannot be guided from the periphery of the rotary compression mechanism 6A to the blade chamber 75. Therefore, the communication passage 77 that communicates the high-pressure storage chamber 69 that temporarily stores the high-pressure refrigerant compressed by the rotary compression mechanism 6A with the blade chamber 75 is provided. As a result, the blade chamber 75 can be set to a high pressure, and the biasing force of the blade 72 can be secured.

[0089] The demagnetization temperature of the neodymium magnet used in the electric motor 5D is set to 120°C or higher and 150°C or lower, and in a case where the temperature exceeds 150°C, thermal demagnetization occurs to suppress (or stop) the operation of the electric motor 5D. As a result, the electric motor 5D can be prevented from being continuously operated at a temperature exceeding 150°C, so that the disproportionation reaction of the refrigerant can be suppressed.

[0090] In the above-described embodiment, the configuration in which the demagnetization temperature of the neodymium magnet is set to 120°C or higher and 150°C or lower is described in combination with the configuration in which the motor spaces S1, S2, S3, and S4 are set to 6 MPa or less, but the configuration in which the demagnetization temperature of the neodymium magnet is set to 120°C or higher and 150°C or lower can be applied to the compressor in which the motor space is set to a pressure exceeding 6 MPa.

[0091] The compressor and the compression system described in each of the embodiments described above are understood as follows, for example.

[0092] A compressor (1C) according to a first aspect of the present disclosure includes a housing (2C) in which a refrigerant flows, a compression unit (6A, 6B) that is provided inside the housing and compresses the refrigerant, and an electric motor (5C) that is provided inside the housing and drives the compression unit, 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 (S3) including a winding (53C) of the electric motor is 6 MPa or less, and the compressor (1C) is configured such that, in the first aspect, the compression unit 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 the refrigerant from the motor space and compresses the refrigerant.

[0093] In the HFO refrigerant containing R1123 or R1132 (E) or the mixed refrigerant containing the HFO refrigerant, there is a concern that a disproportionation reaction may occur in a case where the three conditions of pressure, temperature, and ignition energy are all present. Therefore, the pressure in the motor space including the winding of the electric motor is set to 6 MPa or less. As a result, the disproportionation reaction of the HFO refrigerant can be suppressed as much as possible.

[0094] Examples of the HFO refrigerant or the mixed refrigerant containing the HFO refrigerant contain R474A (a mixed refrigerant of R1132 (E) and R1234yf) and R479A (a mixed refrigerant containing R1132 (E), R1234yf, and R32).

[0095] The motor space is provided between the rotary compression mechanism and the scroll compression mechanism, the refrigerant compressed by the rotary compression mechanism is discharged into the motor space, and the scroll compression mechanism sucks the refrigerant from the motor space and compresses the refrigerant. As a result, the motor space can be set to an intermediate pressure between a low pressure at which the rotary compression mechanism sucks the refrigerant and a high pressure at which the scroll compression mechanism discharges the refrigerant, and the motor space can be set to 6 MPa or less.

[0096] A compressor (1D) according to a second aspect of the present disclosure includes a housing (2D) in which a refrigerant flows, a compression unit (6A) that is provided inside the housing and compresses the refrigerant, and an electric motor (5D) that is provided inside the housing and drives the compression unit, 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) including a winding (53D) of the electric motor is 6 MPa or less, the compression unit includes a rotary compression mechanism (6A), and the rotary compression mechanism sucks the refrigerant from the motor space (S4), compresses the refrigerant, and then discharges the refrigerant to an outside of the housing (2D).

[0097] In the HFO refrigerant containing R1123 or R1132 (E) or the mixed refrigerant containing the HFO refrigerant, there is a concern that a disproportionation reaction may occur in a case where the three conditions of pressure, temperature, and ignition energy are all present. Therefore, the pressure in the motor space including the winding of the electric motor is set to 6 MPa or less. As a result, the disproportionation reaction of the HFO refrigerant can be suppressed as much as possible.

[0098] Examples of the HFO refrigerant or the mixed refrigerant containing the HFO refrigerant contain R474A (a mixed refrigerant of R1132 (E) and R1234yf) and R479A (a mixed refrigerant containing R1132 (E), R1234yf, and R32).

[0099] By adopting a configuration in which the rotary compression mechanism sucks the refrigerant from the motor space, the motor space is set to a space corresponding to the suction pressure, that is, a low-pressure space. As a result, the motor space can be set to 6 MPa or less.

[0100] A compressor (1D) according to a third aspect of the present disclosure is configured such that, in the second aspect, the rotary compression mechanism includes a compression chamber (61) formed as a cylindrical space, a piston rotor (63) that eccentrically rotates inside the compression chamber, a blade (72) that has a tip end portion in contact with an outer peripheral surface of the piston rotor to form a pressure partition wall, a spring (74) that biases the blade in a direction of the tip end portion, a blade chamber (75) that accommodates a rear end portion 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 the high-pressure storage chamber with the blade chamber is provided.

[0101] The blade is biased toward the tip end portion side (the rotor side) by the pressure of the blade chamber in addition to the pressing force of the spring. As the assist, it is preferable to guide the high-pressure refrigerant compressed by the rotary compression mechanism to the blade chamber. However, since the motor space of the rotary compression mechanism that sucks the refrigerant is set to a low pressure, the high-pressure refrigerant cannot be guided from the periphery of the rotary compression mechanism to the blade chamber. Therefore, the communication passage that communicates the high-pressure storage chamber that temporarily stores the high-pressure refrigerant compressed by the rotary compression mechanism with the blade chamber is provided. As a result, the blade chamber can be set to a high pressure, and the biasing force of the blade can be secured.

[0102] A compressor (1A, 1B, 1C, 1D) according to a fourth aspect of the present disclosure is configured such that, in any one of the first to third aspects, the electric motor includes a neodymium magnet, and a demagnetization temperature of the neodymium magnet is 120°C or higher and 150°C or lower.

[0103] In the HFO refrigerant containing R1123 or R1132 (E) or the mixed refrigerant containing the HFO refrigerant, there is a concern that a disproportionation reaction may occur in a case where the temperature exceeds 150°C. Therefore, the demagnetization temperature of the neodymium magnet used in the electric motor is set to 150°C or lower (120°C or higher), and in a case where the temperature exceeds 150°C, thermal demagnetization occurs to suppress (or stop) the operation of the electric motor. As a result, the electric motor can be prevented from being continuously operated at a temperature exceeding 150°C, so that the disproportionation reaction of the refrigerant can be suppressed.

[0104] 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 and compresses the refrigerant discharged from the rotary compressor, the rotary compressor includes a first housing in which the refrigerant flows, a rotary compression unit that is provided inside the first housing and compresses the refrigerant, a first electric motor that is provided inside the first housing and drives the rotary compression unit, and a first motor space into which the refrigerant compressed by the rotary compression unit is guided and which includes a winding of the first electric motor, the scroll compressor includes a second housing in which the refrigerant flows, a scroll compression unit that is provided inside the second housing and compresses the refrigerant, a second electric motor that is provided inside the second housing and drives the scroll compression unit, and a second motor space into which the refrigerant discharged from the rotary compressor is guided and which is provided on a refrigerant suction side of the scroll compression unit and includes a winding of the second electric motor, the refrigerant is an HFO refrigerant containing R1123 or R1132 (E) or a mixed refrigerant containing the HFO refrigerant, and a pressure in the first motor space and a pressure in the second motor space are 6 MPa or less.

[0105] The refrigerant compressed by the rotary compression mechanism is discharged from the rotary compressor through the first motor space. The refrigerant discharged from the rotary compressor is guided to the scroll compressor and is compressed by the scroll compression mechanism through the second motor space. As a result, the first motor space and the second motor space can be set to an intermediate pressure between a low pressure at which the rotary compressor sucks the refrigerant and a high pressure at which the scroll compressor discharges the refrigerant, and the first motor space and the second motor space can be set to 6 MPa or less.

[0106] A compressor (1A, 1B, 1C, 1D) according to a fifth aspect of the present disclosure includes a housing in which a refrigerant flows, a compression unit that is provided inside the housing and compresses the refrigerant, and an electric motor that is provided inside the housing and drives the compression unit, 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, and a demagnetization temperature of the neodymium magnet is 120°C or higher and 150°C or lower.

[0107] In the HFO refrigerant containing R1123 or R1132 (E) or the mixed refrigerant containing the HFO refrigerant, there is a concern that a disproportionation reaction may occur in a case where the temperature exceeds 150°C. Therefore, the demagnetization temperature of the neodymium magnet used in the electric motor is set to 150°C or lower (120°C or higher), and in a case where the temperature exceeds 150°C, thermal demagnetization occurs to suppress (or stop) the operation of the electric motor. As a result, the electric motor can be prevented from being continuously operated at a temperature exceeding 150°C, so that the disproportionation reaction of the refrigerant can be suppressed.Reference Signs List

[0108] 1: compressor system 1A: rotary compressor 1B: scroll compressor 2A: housing (first housing) 2B: housing (second housing) 2C: housing 3A: rotary shaft body 3B: rotary shaft body 3C: rotary shaft body 5A: electric motor (first electric motor) 5B: electric motor (second electric motor) 5C: electric motor 6A: rotary compression mechanism (compression unit) 6B: scroll compression mechanism (compression unit) 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: orbiting scroll 65: fixed scroll 66: discharge cover 69: high-pressure storage chamber 70A: upper bearing 70B: lower bearing 72: blade 74: spring 75: blade chamber 77: communication passage S1: first motor space S2: second motor space S3: motor space S4: motor space

Examples

first embodiment

[First Embodiment]

[0015]Hereinafter, a first embodiment of the present disclosure will be described.

[0016]FIG. 1 shows a compressor system 1 according to the present embodiment. The compressor system 1 includes a rotary compressor 1A and a scroll compressor 1B. The compressor system 1 is a two-stage compression in which the refrigerant compressed by the rotary compressor 1A is guided to the scroll compressor 1B and further compressed.

[0017]As the refrigerant, a hydro fluoro olefin (HFO) refrigerant is used, and examples thereof contain R474A (a mixed refrigerant of R1132 (E) and R1234yf) and R479A (a mixed refrigerant containing R1132 (E), R1234yf, and R32). In such an HFO refrigerant or a mixed refrigerant containing the HFO refrigerant, a disproportionation reaction with large heat release occurs in a case where pressure, temperature, and ignition energy are all present. The pressure, the temperature, and the ignition energy at which the disproportionation reaction occurs are, for...

second embodiment

[Second Embodiment]

[0045]Next, a second embodiment of the present disclosure will be described.

[0046]FIG. 2 shows a compressor 1C according to the present embodiment. The compressor 1C includes the rotary compression mechanism 6A and the scroll compression mechanism 6B in a housing 2C. The rotary compression mechanism 6A is disposed at a bottom portion (one end) of the housing 2C, and the scroll compression mechanism 6B is disposed at an upper portion (the other end) of the housing 2C.

[0047]As the refrigerant, a hydro fluoro olefin (HFO) refrigerant or a mixed refrigerant containing the HFO refrigerant is used, and examples thereof contain R474A (a mixed refrigerant of R1132 (E) and R1234yf) and R479A (a mixed refrigerant containing R1132 (E), R1234yf, and R32). In such an HFO refrigerant or a mixed refrigerant containing the HFO refrigerant, a disproportionation reaction with large heat release occurs in a case where pressure, temperature, and ignition energy are all present. The p...

third embodiment

[Third Embodiment]

[0065]Next, a third embodiment of the present disclosure will be described.

[0066]FIG. 3 shows a compressor 1D according to the present embodiment. As the refrigerant used in the compressor 1D, a hydro fluoro olefin (HFO) refrigerant or a mixed refrigerant containing the HFO refrigerant is used, and examples thereof contain R474A (a mixed refrigerant of R1132 (E) and R1234yf) and R479A (a mixed refrigerant containing R1132 (E), R1234yf, and R32). In such an HFO refrigerant or a mixed refrigerant containing the HFO refrigerant, a disproportionation reaction with large heat release occurs in a case where pressure, temperature, and ignition energy are all present. The pressure, the temperature, and the ignition energy at which the disproportionation reaction occurs are, for example, 6 MPa, 150°C, and 30 J, respectively.

[0067]The compressor 1D is, for example, a sealed-type electric rotary compressor used in an air conditioner, a refrigerating apparatus, or the like. Th...

Technical Field

[0001] The present disclosure relates to a compressor and a compressor system that use an HFO refrigerant or a mixed refrigerant containing an HFO refrigerant.Background Art

[0002] As a low global warming potential (GWP) refrigerant, a hydro fluoro olefin (HFO) refrigerant containing R1123 or R1132 (E) is known.

[0003] The HFO refrigerant has lower stability than a conventional working medium such as R410A, and pressure increases with large heat release due to a disproportionation reaction, which may reduce reliability of the compressor.

[0004] In PTL 1, a communication unit that communicates a compressor accommodation space and a space outside the compressor accommodation space is provided in an outdoor unit of an air conditioner that accommodates a compressor, and in a case where a disproportionation reaction occurs in the compressor, the compressor is damaged, and a working medium is emitted and diffused as soot in the compressor accommodation space, the soot is discharged from the communication unit to the outside of the outdoor unit.Citation ListPatent Literature

[0005] [PTL 1] Japanese Patent No. 7149494Summary of InventionTechnical Problem

[0006] PTL 1 is effective as a measure in a case where a disproportionation reaction occurs in the compressor. However, it is more preferable to suppress the disproportionation reaction that may occur in the compressor as much as possible.

[0007] The present disclosure has been made in view of such circumstances, and an object of the present disclosure is to provide a compressor and a compressor system that can suppress a disproportionation reaction of an HFO refrigerant or a mixed refrigerant containing an HFO refrigerant as much as possible.Solution to Problem

[0008] According to an aspect of the present disclosure, a compressor includes a housing in which a refrigerant flows, a compression unit that is provided inside the housing and compresses the refrigerant, and an electric motor that is provided inside the housing and drives the compression unit, 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 sucks the refrigerant from the motor space and compresses the refrigerant.

[0009] According to an aspect of the present disclosure, a compressor includes a housing in which a refrigerant flows, a compression unit that is provided inside the housing and compresses the refrigerant, and an electric motor that is provided inside the housing and drives the compression unit, 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, and the rotary compression mechanism sucks the refrigerant from the motor space, compresses the refrigerant, and then discharges the refrigerant to an outside of the housing.

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

[0011] According to an aspect of the present disclosure, a compressor includes a housing in which a refrigerant flows, a compression unit that is provided inside the housing and compresses the refrigerant, and an electric motor that is provided inside the housing and drives the compression unit, 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, and a demagnetization temperature of the neodymium magnet is 120°C or higher and 150°C or lower.Advantageous Effects of Invention

[0012] A disproportionation reaction of an HFO refrigerant or a mixed refrigerant containing an HFO refrigerant can be suppressed as much as possible.Brief Description of Drawings

[0013] FIG. 1 is a longitudinal cross-sectional view showing a compressor system according to a first embodiment of the present disclosure. FIG. 2 is a longitudinal cross-sectional view of a compressor according to a second embodiment of the present disclosure. FIG. 3 is a longitudinal cross-sectional view of a compressor according to a third embodiment of the present disclosure. FIG. 4 is a plan view of a rotary compression mechanism in which a compression chamber of FIG. 3 is viewed in a plan view. FIG. 5 is an enlarged longitudinal cross-sectional view showing a blade chamber of FIG. 4. Description of Embodiments

[0014] Hereinafter, an embodiment according to the present disclosure will be described with reference to the drawings.[First Embodiment]

[0015] Hereinafter, a first embodiment of the present disclosure will be described.

[0016] FIG. 1 shows a compressor system 1 according to the present embodiment. The compressor system 1 includes a rotary compressor 1A and a scroll compressor 1B. The compressor system 1 is a two-stage compression in which the refrigerant compressed by the rotary compressor 1A is guided to the scroll compressor 1B and further compressed.

[0017] As the refrigerant, a hydro fluoro olefin (HFO) refrigerant is used, and examples thereof contain R474A (a mixed refrigerant of R1132 (E) and R1234yf) and R479A (a mixed refrigerant containing R1132 (E), R1234yf, and R32). In such an HFO refrigerant or a mixed refrigerant containing the HFO refrigerant, a disproportionation reaction with large heat release occurs in a case where pressure, temperature, and ignition energy are all present. The pressure, the temperature, and the ignition energy at which the disproportionation reaction occurs are, for example, 6 MPa, 150°C, and 30 J, respectively.

[0018] The rotary compressor 1A is, for example, a sealed-type electric rotary compressor used in an air conditioner, a refrigerating apparatus, or the like. The rotary compressor 1A includes a compressor main body 10A and an accumulator 12. The accumulator 12 includes an inlet pipe 15 that introduces the refrigerant to an upper portion thereof, and is connected to the compressor main body 10A via a suction pipe 11.

[0019] The compressor main body 10A includes a housing (first housing) 2A having a substantially cylindrical shape, a rotary shaft body 3A, an electric motor (first electric motor) 5A, and a rotary compression mechanism (compression unit) 6A.

[0020] A discharge pipe 13 and a power supply terminal 30A are provided at an upper portion of the housing 2A. The discharge pipe 13 discharges the compressed refrigerant to the outside of the housing 2A. The power supply terminals 30A are supplied with three-phase power from an inverter device (not shown). Power is supplied to the electric motor 5A from the power supply terminal 30A via a wiring 32A.

[0021] The electric motor 5A is accommodated in a center portion of the housing 2A in an up-down direction. The electric motor 5A includes a rotor 51A and a stator 52A. The rotor 51A is fixed to an outer peripheral surface of the rotary shaft body 3A and is disposed above the rotary compression mechanism 6A. The stator 52A is disposed to surround the outer peripheral surface of the rotor 51A and is fixed to an inner surface of the housing 2A.

[0022] A neodymium magnet is used as the rotor 51A. A demagnetization temperature of the neodymium magnet is 120°C or higher and 150°C or lower.

[0023] The stator 52A includes a winding 53A. A space including the winding 53A is a first motor space S1. A pressure in the first motor space S1 is 6 MPa or less.

[0024] Power is supplied to the winding 53A of the stator 52A from the power supply terminal 30A via the wiring 32A. The electric motor 5A rotates the rotary shaft body 3A by the supplied power.

[0025] The rotary compression mechanism 6A is disposed below the electric motor 5A and at a bottom portion of the housing 2A. The rotary compression mechanism 6A is provided in two stages in the up-down direction, and includes a piston rotor 63 in a compression chamber 61 that is a cylindrical space. The piston rotor 63 eccentrically rotates in the compression chamber 61 by the rotary shaft body 3A.

[0026] The scroll compressor 1B is, for example, a sealed-type electric scroll compressor used in an air conditioner, a refrigerating apparatus, or the like. The scroll compressor 1B includes a compressor main body 10B.

[0027] The compressor main body 10B includes a housing (second housing) 2B having a substantially cylindrical shape, a rotary shaft body 3B, an electric motor (second electric motor) 5B, and a scroll compression mechanism (compression unit) 6B.

[0028] A suction pipe 16 and a power supply terminal 30B are provided below the scroll compression mechanism 6B of the housing 2B. The suction pipe 16 sucks the refrigerant compressed by the rotary compressor 1A into the housing 2B. The power supply terminals 30B are supplied with three-phase power from an inverter device (not shown). Power is supplied to the electric motor 5B from the power supply terminal 30B via a wiring 32B.

[0029] 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.

[0030] The electric motor 5B is accommodated in a center portion of the housing 2B in the up-down direction. The electric motor 5B includes a rotor 51B and a stator 52B. The rotor 51B is fixed to an outer peripheral surface of the rotary shaft body 3B and is disposed below the scroll compression mechanism 6B. The stator 52B is disposed to surround the outer peripheral surface of the rotor 51B and is fixed to an inner surface of the housing 2B.

[0031] A neodymium magnet is used as the rotor 51B. A demagnetization temperature of the neodymium magnet is 120°C or higher and 150°C or lower.

[0032] The stator 52B includes a winding 53B. A space including the winding 53B is a second motor space S2. A pressure in the second motor space S2 is 6 MPa or less.

[0033] Power is supplied to the stator 52B from the power supply terminal 30B via the wiring 32B. The electric motor 5B rotates the rotary shaft body 3B by the supplied power.

[0034] The scroll compression mechanism 6B is disposed above the electric motor 5B and at an upper portion of the housing 2B. The scroll compression mechanism 6B includes an orbiting scroll 64 that performs an orbiting revolution movement by the rotary shaft body 3B and a fixed scroll 65 that meshes with the orbiting scroll 64 to form a compression chamber.

[0035] The compressor system 1 operates as follows.

[0036] In FIG. 1, a flow of the refrigerant is indicated by a thick arrow.

[0037] The refrigerant is guided from, for example, an evaporator (not shown) and flows into the accumulator 12 from the inlet pipe 15. The refrigerant in a gas phase separated into gas and liquid in the accumulator 12 is guided to the rotary compression mechanism 6A through the suction pipe 11 of the rotary compressor 1A. In the rotary compression mechanism 6A, the refrigerant is compressed by the piston rotor 63 that rotates together with the rotary shaft body 3A. The compressed refrigerant is discharged from the rotary compression mechanism 6A into the first motor space S1 in the housing 2A.

[0038] The refrigerant flowing into the first motor space S1 flows upward through a through-hole or the like formed in the rotor 51A. In this case, the refrigerant flows through a periphery of the winding 53A or a periphery of the power supply terminal 30A. Thereafter, the refrigerant is discharged to the outside of the rotary compressor 1A through the discharge pipe 13.

[0039] The refrigerant discharged from the rotary compressor 1A is guided to the suction pipe 16 of the scroll compressor 1B through a connection pipe (not shown) as indicated by a thick arrow. The refrigerant flowing into the housing 2B from the suction pipe 16 is guided to the scroll compression mechanism 6B through a periphery of the winding 53B or a periphery of the power supply terminal 30B.

[0040] In the scroll compression mechanism 6B, the refrigerant is compressed in the compression chamber formed by the orbiting scroll 64 and the fixed scroll 65 and is discharged to the outside of the scroll compressor 1B from the discharge pipe 17.

[0041] The operations and effects of the present embodiment described above are as follows.

[0042] In the HFO refrigerant containing R1123 or R1132 (E) or the mixed refrigerant containing the HFO refrigerant, there is a concern that a disproportionation reaction may occur in a case where the three conditions of pressure, temperature, and ignition energy are all present. Therefore, the pressure in the motor spaces S1 and S2 including the windings 53A and 53B of the electric motors 5A and 5B is set to 6 MPa or less. As a result, the disproportionation reaction of the HFO refrigerant can be suppressed as much as possible.

[0043] The refrigerant compressed by the rotary compression mechanism 6A is discharged from the rotary compressor 1A through the first motor space S1. The refrigerant discharged from the rotary compressor 1A is guided to the scroll compressor 1B and is compressed by the scroll compression mechanism 6B through the second motor space S2. As a result, the first motor space S1 and the second motor space S2 can be set to an intermediate pressure between a low pressure at which the rotary compressor 1A sucks the refrigerant and a high pressure at which the scroll compressor 1B discharges the refrigerant, and the first motor space S1 and the second motor space S2 can be set to 6 MPa or less. As a result, the disproportionation reaction of the HFO refrigerant can be suppressed as much as possible even in a case where the windings 53A and 53B or the wirings 32A and 32B are short-circuited.

[0044] The demagnetization temperature of the neodymium magnet used in the electric motors 5A and 5B is set to 120°C or higher and 150°C or lower, and in a case where the temperature exceeds 150°C, thermal demagnetization occurs to suppress (or stop) the operation of the electric motors 5A and 5B. As a result, the electric motors 5A and 5B can be prevented from being continuously operated at a temperature exceeding 150°C, so that the disproportionation reaction of the refrigerant can be suppressed.[Second Embodiment]

[0045] Next, a second embodiment of the present disclosure will be described.

[0046] FIG. 2 shows a compressor 1C according to the present embodiment. The compressor 1C includes the rotary compression mechanism 6A and the scroll compression mechanism 6B in a housing 2C. The rotary compression mechanism 6A is disposed at a bottom portion (one end) of the housing 2C, and the scroll compression mechanism 6B is disposed at an upper portion (the other end) of the housing 2C.

[0047] As the refrigerant, a hydro fluoro olefin (HFO) refrigerant or a mixed refrigerant containing the HFO refrigerant is used, and examples thereof contain R474A (a mixed refrigerant of R1132 (E) and R1234yf) and R479A (a mixed refrigerant containing R1132 (E), R1234yf, and R32). In such an HFO refrigerant or a mixed refrigerant containing the HFO refrigerant, a disproportionation reaction with large heat release occurs in a case where pressure, temperature, and ignition energy are all present. The pressure, the temperature, and the ignition energy at which the disproportionation reaction occurs are, for example, 6 MPa, 150°C, and 30 J, respectively.

[0048] 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 an outer peripheral surface of a rotary shaft body 3C and is disposed above the rotary compression mechanism 6A. The stator 52C is disposed to surround the outer peripheral surface of the rotor 51C and is fixed to an inner surface of the housing 2C.

[0049] The rotary shaft body 3B extends in both the downward and upward directions of the electric motor 5C. The piston rotor 63 is rotated at a lower end of the rotary shaft body 3B, and the orbiting scroll 64 is rotated at an upper end thereof.

[0050] A neodymium magnet is used as the rotor 51C. A demagnetization temperature of the neodymium magnet is 120°C or higher and 150°C or lower.

[0051] The stator 52C includes a winding 53C. A space including the winding 53C is a motor space S3. A pressure in the motor space S3 is 6 MPa or less.

[0052] Power is supplied to the winding 53C of the stator 52C from a power supply terminal 30C. The electric motor 5C rotates the rotary shaft body 3C by the supplied power.

[0053] The rotary compression mechanism 6A is disposed below the electric motor 5C and at a bottom portion of the housing 2C. The rotary compression mechanism 6A includes a piston rotor 63 in a compression chamber 61 that is a cylindrical space. The piston rotor 63 eccentrically rotates in the compression chamber 61 by the rotary shaft body 3C.

[0054] The scroll compression mechanism 6B is disposed above the electric motor 5C and at an upper portion of the housing 2C. The scroll compression mechanism 6B includes an orbiting scroll 64 that performs an orbiting revolution movement by the rotary 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. A lower end of the discharge pipe 17 is connected to an upper end of the discharge cover 66.

[0055] The power supply terminal 30C is provided at an upper portion of the housing 2C. The upper portion of the housing 2C in which the power supply terminal 30C is provided and the wiring 32C is disposed is partitioned by the discharge cover 66 of the scroll compression mechanism 6B. Therefore, the upper portion of the housing 2C is not the pressure of the high-pressure refrigerant discharged from the scroll compression mechanism 6B, but has the same pressure (intermediate pressure) as the motor space S3.

[0056] The compressor 1C operates as follows.

[0057] In FIG. 2, a flow of the refrigerant is indicated by a thick arrow.

[0058] The refrigerant is guided from, for example, an evaporator (not shown) and flows into the accumulator 12 from the inlet pipe 15. The refrigerant in a gas phase separated into gas and liquid in the accumulator 12 is guided to the rotary compression mechanism 6A through the suction pipe 11. In the rotary compression mechanism 6A, the refrigerant is compressed by the piston rotor 63 that rotates together with the rotary shaft body 3C. The compressed refrigerant is discharged from the rotary compression mechanism 6A into the motor space S3 located at the center of the housing 2C.

[0059] The refrigerant flowing into the motor space S3 flows upward through a through-hole or the like formed in the rotor 51C. In this case, the refrigerant flows through a periphery of the winding 53C or a periphery of the wiring 32C guided from the power supply terminal 30C. Thereafter, the refrigerant is guided to the scroll compression mechanism 6B.

[0060] In the scroll compression mechanism 6B, the refrigerant is compressed in the compression chamber formed by the orbiting scroll 64 and the fixed scroll 65 and is discharged to the outside of the compressor 1C from the discharge pipe 17.

[0061] The operations and effects of the present embodiment described above are as follows.

[0062] In the HFO refrigerant containing R1123 or R1132 (E) or the mixed refrigerant containing the HFO refrigerant, there is a concern that a disproportionation reaction may occur in a case where the three conditions of pressure, temperature, and ignition energy are all present. Therefore, the pressure in the motor space S3 including the winding 53C of the electric motor 5C is set to 6 MPa or less. As a result, the disproportionation reaction of the HFO refrigerant can be suppressed as much as possible.

[0063] The motor space S3 is provided between the rotary compression mechanism 6A and the scroll compression mechanism 6B, the refrigerant compressed by the rotary compression mechanism 6A is discharged into the motor space S3, and the scroll compression mechanism 6B sucks the refrigerant from the motor space S3 and compresses the refrigerant. As a result, the motor space S3 can be set to an intermediate pressure between a low pressure at which the rotary compression mechanism 6A sucks the refrigerant and a 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. As a result, the disproportionation reaction of the HFO refrigerant can be suppressed as much as possible even in a case where the winding 53C or the wiring 32C is short-circuited.

[0064] The demagnetization temperature of the neodymium magnet used in the electric motor 5C is set to 120°C or higher and 150°C or lower, and in a case where the temperature exceeds 150°C, thermal demagnetization occurs to suppress (or stop) the operation of the electric motor 5C. As a result, the electric motor 5C can be prevented from being continuously operated at a temperature exceeding 150°C, so that the disproportionation reaction of the refrigerant can be suppressed.[Third Embodiment]

[0065] Next, a third embodiment of the present disclosure will be described.

[0066] FIG. 3 shows a compressor 1D according to the present embodiment. As the refrigerant used in the compressor 1D, a hydro fluoro olefin (HFO) refrigerant or a mixed refrigerant containing the HFO refrigerant is used, and examples thereof contain R474A (a mixed refrigerant of R1132 (E) and R1234yf) and R479A (a mixed refrigerant containing R1132 (E), R1234yf, and R32). In such an HFO refrigerant or a mixed refrigerant containing the HFO refrigerant, a disproportionation reaction with large heat release occurs in a case where pressure, temperature, and ignition energy are all present. The pressure, the temperature, and the ignition energy at which the disproportionation reaction occurs are, for example, 6 MPa, 150°C, and 30 J, respectively.

[0067] The compressor 1D is, for example, a sealed-type electric rotary compressor used in an air conditioner, a refrigerating apparatus, or the like. The compressor 1D includes a housing 2D having a substantially cylindrical shape, a rotary shaft body 3D, an electric motor 5D, and a rotary compression mechanism (compression unit) 6A.

[0068] The suction pipe 11 and a power supply terminal 30D are provided at an upper portion of the housing 2D. The low-pressure refrigerant guided from the evaporator or the like is guided into the housing 2D from the suction pipe 11. The power supply terminals 30D are supplied with three-phase power from an inverter device (not shown). Power is supplied to the electric motor 5D from the power supply terminal 30D via a wiring 32D.

[0069] The electric motor 5D is accommodated in a center portion of the housing 2D in the up-down direction. The electric motor 5D includes a rotor 51D and a stator 52D. The rotor 51D is fixed to an outer peripheral surface of the rotary shaft body 3D and is disposed above the rotary compression mechanism 6A. The stator 52D is disposed to surround the outer peripheral surface of the rotor 51D and is fixed to an inner surface of the housing 2D.

[0070] A neodymium magnet is used as the rotor 51D. A demagnetization temperature of the neodymium magnet is 120°C or higher and 150°C or lower.

[0071] The stator 52D includes a winding 53D. A space including the winding 53D is a motor space S4. A pressure in the motor space S4 is 6 MPa or less.

[0072] Power is supplied to the winding 53D of the stator 52D from the power supply terminal 30D via the wiring 32D. The electric motor 5D rotates the rotary shaft body 3D by the supplied power.

[0073] The rotary compression mechanism 6A is disposed below the electric motor 5D and at a bottom portion of the housing 2D. The rotary compression mechanism 6A includes a piston rotor 63 in a compression chamber 61 that is a cylindrical space. The piston rotor 63 eccentrically rotates in the compression chamber 61 by the rotary shaft body 3D.

[0074] The rotary compression mechanism 6A is disposed in a state of being sandwiched from above and below by an upper bearing 70A and a lower bearing 70B. The rotary shaft body 3D is rotatably supported by the upper bearing 70A and the lower bearing 70B.

[0075] A high-pressure storage chamber 69 in which the high-pressure refrigerant compressed by the piston rotor 63 is temporarily stored is formed between the compression chamber 61 and the upper bearing 70A. The high-pressure refrigerant is discharged from the discharge pipe 17 to the outside of the compressor 1D through the high-pressure storage chamber 69.

[0076] FIG. 4 is a plan view of the rotary compression mechanism 6A as viewed from above the compression chamber 61. A tip end portion of a blade 72 is in contact with an outer peripheral surface of the piston rotor 63. The blade 72 partitions the compression chamber 61 to form a pressure partition wall.

[0077] A spring 74 that biases the blade 72 in a direction of the tip end portion is provided on a rear end side of the blade 72. The spring 74 is provided in a blade chamber 75 that accommodates a rear end portion of the blade 72.

[0078] As shown in FIG. 5, a communication passage 77 is provided between the blade chamber 75 and the high-pressure storage chamber 69. The high-pressure refrigerant is guided from the high-pressure storage chamber 69 to the blade chamber 75 through the communication passage 77.

[0079] The compressor 1D operates as follows.

[0080] In FIG. 3, a flow of the refrigerant is indicated by a thick arrow.

[0081] 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.

[0082] The refrigerant flowing into the motor space S4 flows downward through a through-hole or the like formed in the rotor 51A. In this case, the refrigerant flows through a periphery of the winding 53D or a periphery of the wiring 32D guided from the power supply terminal 30D. Thereafter, the refrigerant is guided to the rotary compression mechanism 6A. As described above, the refrigerant in the motor space S4 has the same pressure as the suction pressure and is set to a low pressure.

[0083] In the rotary compression mechanism 6A, the refrigerant is compressed by the piston rotor 63 that rotates together with the rotary shaft body 3D. The compressed high-pressure refrigerant is guided from the rotary compression mechanism 6A to the high-pressure storage chamber 69 and is discharged from the discharge pipe 17 to the outside of the compressor 1D.

[0084] A part of the high-pressure refrigerant guided to the high-pressure storage chamber 69 is guided to the blade chamber 75 through the communication passage 77 as shown in FIG. 5. As a result, the blade chamber 75 has a high pressure, and the rear end portion of the blade 72 is biased toward the tip end portion by this pressure.

[0085] The operations and effects of the present embodiment described above are as follows.

[0086] In the HFO refrigerant containing R1123 or R1132 (E) or the mixed refrigerant containing the HFO refrigerant, there is a concern that a disproportionation reaction may occur in a case where the three conditions of pressure, temperature, and ignition energy are all present. Therefore, the pressure in the motor space S4 including the winding 53D of the electric motor 5D is set to 6 MPa or less. As a result, the disproportionation reaction of the HFO refrigerant can be suppressed as much as possible.

[0087] By adopting a configuration in which the rotary compression mechanism 6A sucks the refrigerant from the motor space S4, the motor space S4 is set to a space corresponding to the suction pressure, that is, a low-pressure space. As a result, the motor space S4 can be set to 6 MPa or less.

[0088] The blade 72 is biased toward the tip end portion side (the piston rotor 63 side) by the pressure of the blade chamber 75 in addition to the pressing force of the spring 74. As the assist, it is preferable to guide the 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 sucks the refrigerant is a low-pressure housing structure in which the pressure is low, high-pressure refrigerant cannot be guided from the periphery of the rotary compression mechanism 6A to the blade chamber 75. Therefore, the communication passage 77 that communicates the high-pressure storage chamber 69 that temporarily stores the high-pressure refrigerant compressed by the rotary compression mechanism 6A with the blade chamber 75 is provided. As a result, the blade chamber 75 can be set to a high pressure, and the biasing force of the blade 72 can be secured.

[0089] The demagnetization temperature of the neodymium magnet used in the electric motor 5D is set to 120°C or higher and 150°C or lower, and in a case where the temperature exceeds 150°C, thermal demagnetization occurs to suppress (or stop) the operation of the electric motor 5D. As a result, the electric motor 5D can be prevented from being continuously operated at a temperature exceeding 150°C, so that the disproportionation reaction of the refrigerant can be suppressed.

[0090] In the above-described embodiment, the configuration in which the demagnetization temperature of the neodymium magnet is set to 120°C or higher and 150°C or lower is described in combination with the configuration in which the motor spaces S1, S2, S3, and S4 are set to 6 MPa or less, but the configuration in which the demagnetization temperature of the neodymium magnet is set to 120°C or higher and 150°C or lower can be applied to the compressor in which the motor space is set to a pressure exceeding 6 MPa.

[0091] The compressor and the compression system described in each of the embodiments described above are understood as follows, for example.

[0092] A compressor (1C) according to a first aspect of the present disclosure includes a housing (2C) in which a refrigerant flows, a compression unit (6A, 6B) that is provided inside the housing and compresses the refrigerant, and an electric motor (5C) that is provided inside the housing and drives the compression unit, 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 (S3) including a winding (53C) of the electric motor is 6 MPa or less, and the compressor (1C) is configured such that, in the first aspect, the compression unit 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 the refrigerant from the motor space and compresses the refrigerant.

[0093] In the HFO refrigerant containing R1123 or R1132 (E) or the mixed refrigerant containing the HFO refrigerant, there is a concern that a disproportionation reaction may occur in a case where the three conditions of pressure, temperature, and ignition energy are all present. Therefore, the pressure in the motor space including the winding of the electric motor is set to 6 MPa or less. As a result, the disproportionation reaction of the HFO refrigerant can be suppressed as much as possible.

[0094] Examples of the HFO refrigerant or the mixed refrigerant containing the HFO refrigerant contain R474A (a mixed refrigerant of R1132 (E) and R1234yf) and R479A (a mixed refrigerant containing R1132 (E), R1234yf, and R32).

[0095] The motor space is provided between the rotary compression mechanism and the scroll compression mechanism, the refrigerant compressed by the rotary compression mechanism is discharged into the motor space, and the scroll compression mechanism sucks the refrigerant from the motor space and compresses the refrigerant. As a result, the motor space can be set to an intermediate pressure between a low pressure at which the rotary compression mechanism sucks the refrigerant and a high pressure at which the scroll compression mechanism discharges the refrigerant, and the motor space can be set to 6 MPa or less.

[0096] A compressor (1D) according to a second aspect of the present disclosure includes a housing (2D) in which a refrigerant flows, a compression unit (6A) that is provided inside the housing and compresses the refrigerant, and an electric motor (5D) that is provided inside the housing and drives the compression unit, 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) including a winding (53D) of the electric motor is 6 MPa or less, the compression unit includes a rotary compression mechanism (6A), and the rotary compression mechanism sucks the refrigerant from the motor space (S4), compresses the refrigerant, and then discharges the refrigerant to an outside of the housing (2D).

[0097] In the HFO refrigerant containing R1123 or R1132 (E) or the mixed refrigerant containing the HFO refrigerant, there is a concern that a disproportionation reaction may occur in a case where the three conditions of pressure, temperature, and ignition energy are all present. Therefore, the pressure in the motor space including the winding of the electric motor is set to 6 MPa or less. As a result, the disproportionation reaction of the HFO refrigerant can be suppressed as much as possible.

[0098] Examples of the HFO refrigerant or the mixed refrigerant containing the HFO refrigerant contain R474A (a mixed refrigerant of R1132 (E) and R1234yf) and R479A (a mixed refrigerant containing R1132 (E), R1234yf, and R32).

[0099] By adopting a configuration in which the rotary compression mechanism sucks the refrigerant from the motor space, the motor space is set to a space corresponding to the suction pressure, that is, a low-pressure space. As a result, the motor space can be set to 6 MPa or less.

[0100] A compressor (1D) according to a third aspect of the present disclosure is configured such that, in the second aspect, the rotary compression mechanism includes a compression chamber (61) formed as a cylindrical space, a piston rotor (63) that eccentrically rotates inside the compression chamber, a blade (72) that has a tip end portion in contact with an outer peripheral surface of the piston rotor to form a pressure partition wall, a spring (74) that biases the blade in a direction of the tip end portion, a blade chamber (75) that accommodates a rear end portion 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 the high-pressure storage chamber with the blade chamber is provided.

[0101] The blade is biased toward the tip end portion side (the rotor side) by the pressure of the blade chamber in addition to the pressing force of the spring. As the assist, it is preferable to guide the high-pressure refrigerant compressed by the rotary compression mechanism to the blade chamber. However, since the motor space of the rotary compression mechanism that sucks the refrigerant is set to a low pressure, the high-pressure refrigerant cannot be guided from the periphery of the rotary compression mechanism to the blade chamber. Therefore, the communication passage that communicates the high-pressure storage chamber that temporarily stores the high-pressure refrigerant compressed by the rotary compression mechanism with the blade chamber is provided. As a result, the blade chamber can be set to a high pressure, and the biasing force of the blade can be secured.

[0102] A compressor (1A, 1B, 1C, 1D) according to a fourth aspect of the present disclosure is configured such that, in any one of the first to third aspects, the electric motor includes a neodymium magnet, and a demagnetization temperature of the neodymium magnet is 120°C or higher and 150°C or lower.

[0103] In the HFO refrigerant containing R1123 or R1132 (E) or the mixed refrigerant containing the HFO refrigerant, there is a concern that a disproportionation reaction may occur in a case where the temperature exceeds 150°C. Therefore, the demagnetization temperature of the neodymium magnet used in the electric motor is set to 150°C or lower (120°C or higher), and in a case where the temperature exceeds 150°C, thermal demagnetization occurs to suppress (or stop) the operation of the electric motor. As a result, the electric motor can be prevented from being continuously operated at a temperature exceeding 150°C, so that the disproportionation reaction of the refrigerant can be suppressed.

[0104] 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 and compresses the refrigerant discharged from the rotary compressor, the rotary compressor includes a first housing in which the refrigerant flows, a rotary compression unit that is provided inside the first housing and compresses the refrigerant, a first electric motor that is provided inside the first housing and drives the rotary compression unit, and a first motor space into which the refrigerant compressed by the rotary compression unit is guided and which includes a winding of the first electric motor, the scroll compressor includes a second housing in which the refrigerant flows, a scroll compression unit that is provided inside the second housing and compresses the refrigerant, a second electric motor that is provided inside the second housing and drives the scroll compression unit, and a second motor space into which the refrigerant discharged from the rotary compressor is guided and which is provided on a refrigerant suction side of the scroll compression unit and includes a winding of the second electric motor, the refrigerant is an HFO refrigerant containing R1123 or R1132 (E) or a mixed refrigerant containing the HFO refrigerant, and a pressure in the first motor space and a pressure in the second motor space are 6 MPa or less.

[0105] The refrigerant compressed by the rotary compression mechanism is discharged from the rotary compressor through the first motor space. The refrigerant discharged from the rotary compressor is guided to the scroll compressor and is compressed by the scroll compression mechanism through the second motor space. As a result, the first motor space and the second motor space can be set to an intermediate pressure between a low pressure at which the rotary compressor sucks the refrigerant and a high pressure at which the scroll compressor discharges the refrigerant, and the first motor space and the second motor space can be set to 6 MPa or less.

[0106] A compressor (1A, 1B, 1C, 1D) according to a fifth aspect of the present disclosure includes a housing in which a refrigerant flows, a compression unit that is provided inside the housing and compresses the refrigerant, and an electric motor that is provided inside the housing and drives the compression unit, 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, and a demagnetization temperature of the neodymium magnet is 120°C or higher and 150°C or lower.

[0107] In the HFO refrigerant containing R1123 or R1132 (E) or the mixed refrigerant containing the HFO refrigerant, there is a concern that a disproportionation reaction may occur in a case where the temperature exceeds 150°C. Therefore, the demagnetization temperature of the neodymium magnet used in the electric motor is set to 150°C or lower (120°C or higher), and in a case where the temperature exceeds 150°C, thermal demagnetization occurs to suppress (or stop) the operation of the electric motor. As a result, the electric motor can be prevented from being continuously operated at a temperature exceeding 150°C, so that the disproportionation reaction of the refrigerant can be suppressed.Reference Signs List

[0108] 1: compressor system 1A: rotary compressor 1B: scroll compressor 2A: housing (first housing) 2B: housing (second housing) 2C: housing 3A: rotary shaft body 3B: rotary shaft body 3C: rotary shaft body 5A: electric motor (first electric motor) 5B: electric motor (second electric motor) 5C: electric motor 6A: rotary compression mechanism (compression unit) 6B: scroll compression mechanism (compression unit) 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: orbiting scroll 65: fixed scroll 66: discharge cover 69: high-pressure storage chamber 70A: upper bearing 70B: lower bearing 72: blade 74: spring 75: blade chamber 77: communication passage S1: first motor space S2: second motor space S3: motor space S4: motor space

Examples

first embodiment

[First Embodiment]

[0015]Hereinafter, a first embodiment of the present disclosure will be described.

[0016]FIG. 1 shows a compressor system 1 according to the present embodiment. The compressor system 1 includes a rotary compressor 1A and a scroll compressor 1B. The compressor system 1 is a two-stage compression in which the refrigerant compressed by the rotary compressor 1A is guided to the scroll compressor 1B and further compressed.

[0017]As the refrigerant, a hydro fluoro olefin (HFO) refrigerant is used, and examples thereof contain R474A (a mixed refrigerant of R1132 (E) and R1234yf) and R479A (a mixed refrigerant containing R1132 (E), R1234yf, and R32). In such an HFO refrigerant or a mixed refrigerant containing the HFO refrigerant, a disproportionation reaction with large heat release occurs in a case where pressure, temperature, and ignition energy are all present. The pressure, the temperature, and the ignition energy at which the disproportionation reaction occurs are, for...

second embodiment

[Second Embodiment]

[0045]Next, a second embodiment of the present disclosure will be described.

[0046]FIG. 2 shows a compressor 1C according to the present embodiment. The compressor 1C includes the rotary compression mechanism 6A and the scroll compression mechanism 6B in a housing 2C. The rotary compression mechanism 6A is disposed at a bottom portion (one end) of the housing 2C, and the scroll compression mechanism 6B is disposed at an upper portion (the other end) of the housing 2C.

[0047]As the refrigerant, a hydro fluoro olefin (HFO) refrigerant or a mixed refrigerant containing the HFO refrigerant is used, and examples thereof contain R474A (a mixed refrigerant of R1132 (E) and R1234yf) and R479A (a mixed refrigerant containing R1132 (E), R1234yf, and R32). In such an HFO refrigerant or a mixed refrigerant containing the HFO refrigerant, a disproportionation reaction with large heat release occurs in a case where pressure, temperature, and ignition energy are all present. The p...

third embodiment

[Third Embodiment]

[0065]Next, a third embodiment of the present disclosure will be described.

[0066]FIG. 3 shows a compressor 1D according to the present embodiment. As the refrigerant used in the compressor 1D, a hydro fluoro olefin (HFO) refrigerant or a mixed refrigerant containing the HFO refrigerant is used, and examples thereof contain R474A (a mixed refrigerant of R1132 (E) and R1234yf) and R479A (a mixed refrigerant containing R1132 (E), R1234yf, and R32). In such an HFO refrigerant or a mixed refrigerant containing the HFO refrigerant, a disproportionation reaction with large heat release occurs in a case where pressure, temperature, and ignition energy are all present. The pressure, the temperature, and the ignition energy at which the disproportionation reaction occurs are, for example, 6 MPa, 150°C, and 30 J, respectively.

[0067]The compressor 1D is, for example, a sealed-type electric rotary compressor used in an air conditioner, a refrigerating apparatus, or the like. Th...

Claims

1. A compressor comprising: a housing in which a refrigerant flows; a compression unit that is provided inside the housing and compresses the refrigerant; and an electric motor that is provided inside the housing and drives 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 sucks the refrigerant from the motor space and compresses the refrigerant.

2. A compressor comprising: a housing in which a refrigerant flows; a compression unit that is provided inside the housing and compresses the refrigerant; and an electric motor that is provided inside the housing and drives 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, and the rotary compression mechanism sucks the refrigerant from the motor space, compresses the refrigerant, and then discharges the refrigerant to an outside of the housing.

3. The compressor according to Claim 2, wherein the rotary compression mechanism includes a compression chamber formed as a cylindrical space, a piston rotor that eccentrically rotates inside the compression chamber, a blade that has a tip end portion in contact with an outer peripheral surface of the piston rotor to form a pressure partition wall, a spring that biases the blade in a direction of the tip end portion, a blade chamber that accommodates a rear end portion of the blade, and a high-pressure storage chamber that temporarily stores the refrigerant compressed in the compression chamber, and a communication passage that communicates the high-pressure storage chamber with the blade chamber is provided.

4. The compressor according to Claim 1 or 2, wherein the electric motor includes a neodymium magnet, and a demagnetization temperature of the neodymium magnet is 120°C or higher and 150°C or lower.

5. A compressor system comprising: a rotary compressor that compresses a refrigerant; and a scroll compressor that sucks and compresses the refrigerant discharged from the rotary compressor, wherein the rotary compressor includes a first housing in which the refrigerant flows, a rotary compression unit that is provided inside the first housing and compresses the refrigerant, a first electric motor that is provided inside the first housing and drives the rotary compression unit, and a first motor space into which the refrigerant compressed by the rotary compression unit is guided and which includes a winding of the first electric motor, the scroll compressor includes a second housing in which the refrigerant flows, a scroll compression unit that is provided inside the second housing and compresses the refrigerant, a second electric motor that is provided inside the second housing and drives the scroll compression unit, and a second motor space into which the refrigerant discharged from the rotary compressor is guided and which is provided on a refrigerant suction side of the scroll compression unit and includes a winding of the second electric motor, the refrigerant is an HFO refrigerant containing R1123 or R1132 (E) or a mixed refrigerant containing the HFO refrigerant, and a pressure in the first motor space and a pressure in the second motor space are 6 MPa or less.

6. A compressor comprising: a housing in which a refrigerant flows; a compression unit that is provided inside the housing and compresses the refrigerant; and an electric motor that is provided inside the housing and drives the compression unit, wherein 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, and a demagnetization temperature of the neodymium magnet is 120°C or higher and 150°C or lower.

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