Rotary compressor and refrigeration cycle device

Abstract

The utility model provides a rotary compressor and a refrigeration cycle device which can capture residues in a gas refrigerant and are high in reliability. A rotary compressor (2) is provided with: a sealed housing (11); an electric motor (12) which is accommodated in the upper part of the sealed housing (11) and has a stator (18) and a rotor (19); a compression mechanism part (13) which is accommodated in the lower part of the sealed housing (11) and is connected with the rotor (19) through a rotating shaft (14); an oil separation unit (17) provided at the upper part of the electric motor (12); and at least one permanent magnet (104) provided to the oil separation unit (17).

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to a rotary compressor and a refrigeration cycle device. BACKGROUND

[0002] A rotary compressor that compresses a gas refrigerant is known. The rotary compressor is provided with: a closed housing; a compression mechanism portion housed in a lower portion of the closed housing; a motor housed in an upper portion of the closed housing, which drives the compression mechanism portion; a discharge pipe provided on a motor side of the closed housing, which discharges the compressed gas refrigerant; and an oil separation portion installed in an upper portion of the motor. In such a rotary compressor, iron-based residue mixed in the gas refrigerant or the lubricating oil collides with the motor, thereby causing a concern that the motor is burned due to a short circuit between lines or destruction of an insulating paper.

[0003] Therefore, in order to capture the iron-based residue mixed in the gas refrigerant or the lubricating oil, in Patent Literature 1, a groove or a magnet is provided in a bottom portion of the closed housing. Further, in Patent Literature 2, a filter or a magnet is provided in a reservoir.

[0004] PRIOR ART DOCUMENTS

[0005] PATENT LITERATURE

[0006] Patent Literature 1: Japanese Patent Application Laid-Open No. 2010-84585

[0007] Patent Literature 2: International Publication No. 2015 / 052928 SUMMARY

[0008] PROBLEMS TO BE SOLVED BY THE INVENTION

[0009] However, the technology disclosed in Patent Literature 1 and Patent Literature 2 can capture the residue contained in the lubricating oil, but cannot capture the iron-based residue contained in the gas refrigerant in the rotary compressor.

[0010] The present application has been made to solve the above problems, and an object of the present application is to provide a rotary compressor and a refrigeration cycle device that can capture residue contained in a gas refrigerant in a rotary compressor and have high reliability.

[0011] SOLUTION TO THE PROBLEMS

[0012] In order to solve the above problems, the rotary compressor according to an embodiment of the present application is provided with: a closed housing; a motor housed in an upper portion of the closed housing, which has a stator and a rotor; a compression mechanism portion housed in a lower portion of the closed housing, which is linked to the rotor through a rotation shaft; an oil separation portion provided in an upper portion of the motor; and at least one permanent magnet provided in the oil separation portion.

[0013] Preferably, the oil separation portion of the rotary compressor according to the embodiment of the present application has: a cylindrical body located at the center of the rotor and fixed to the rotary shaft; an annular oil separation disc expanding toward the radial outside of the cylindrical body; and a folded-back portion extending from the outer periphery of the oil separation disc toward the motor along the axial direction of the rotary shaft, and the at least one permanent magnet is provided on the motor side of the oil separation disc.

[0014] Further, preferably, the at least one permanent magnet of the rotary compressor according to the embodiment of the present application includes a first permanent magnet installed in the annular oil separation disc.

[0015] Further, preferably, the height dimension of the first permanent magnet of the rotary compressor according to the embodiment of the present application is smaller than the height dimension of the folded-back portion.

[0016] Further, preferably, the at least one permanent magnet of the rotary compressor according to the embodiment of the present application is any one of a rare earth magnet including neodymium (Nd), didymium (Di), and terbium (Tb), a rare earth magnet including neodymium (Nd), didymium (Di), terbium (Tb), and dysprosium (Dy), or a rare earth magnet including samarium (Sm) and cobalt (Co).

[0017] Further, preferably, the at least one permanent magnet of the rotary compressor according to the embodiment of the present application includes a second permanent magnet provided on the folded-back portion.

[0018] Further, preferably, the at least one permanent magnet of the rotary compressor according to the embodiment of the present application includes at least any one of a third permanent magnet and a fourth permanent magnet provided on the cylindrical body.

[0019] Further, preferably, the rotary compressor according to the embodiment of the present application has a discharge pipe provided to extend from the upper end of the hermetic case toward the oil separation portion, and the at least one permanent magnet includes a fifth permanent magnet provided on the discharge pipe side of the oil separation disc.

[0020] Further, in order to solve the above technical problem, the refrigeration cycle device according to the embodiment of the present application has: the rotary compressor; a condenser; an expansion device; an evaporator; and a refrigerant pipe connecting the rotary compressor, the condenser, the expansion device, and the evaporator to circulate a refrigerant.

[0021] Effects of the Invention

[0022] According to the present application, a rotary compressor and a refrigeration cycle device capable of capturing residue contained in gaseous refrigerant in the rotary compressor and having high reliability can be provided. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is an axial sectional view of a rotary compressor and a schematic view of a refrigeration cycle device according to a first embodiment of the present application.

[0024] Figure 2 is an axial sectional view of a rotor and an oil separation portion of a rotary compressor according to the first embodiment of the present application.

[0025] Figure 3 is an axial sectional view and a bottom view of an oil separation portion of a rotary compressor according to the first embodiment of the present application.

[0026] Figure 4 is an axial sectional view and a bottom view of an oil separation portion of a rotary compressor according to a second embodiment of the present application.

[0027] Figure 5 is an axial sectional view and a bottom view of an oil separation portion of a rotary compressor according to a third embodiment of the present application.

[0028] Figure 6 is an axial sectional view and a bottom view of an oil separation portion of a rotary compressor according to a fourth embodiment of the present application. DETAILED DESCRIPTION

[0029] (First Embodiment)

[0030] Hereinafter, a first embodiment of a rotary compressor and a refrigeration cycle device according to the present application will be described with reference to Figures 1 to 3 A first embodiment of a rotary compressor and a refrigeration cycle device according to the present application will be described.

[0031] Figure 1 is an axial sectional view of a rotary compressor 2 and a schematic view of a refrigeration cycle device 1 according to the first embodiment of the present application.

[0032] As shown in Figure 1 , the refrigeration cycle device 1 according to the first embodiment of the present application is provided with a rotary compressor 2, a radiator, i.e., a condenser 3, an expansion device 4, a heat absorber, i.e., an evaporator 5, a liquid accumulator 6, and a refrigerant pipe 7. The refrigerant pipe 7 connects the rotary compressor 2, the condenser 3, the expansion device 4, the evaporator 5, and the liquid accumulator 6 in this order to circulate refrigerant.

[0033] The rotary compressor 2 according to the first embodiment of the present application includes: a hermetic casing 11; a motor 12 provided at an upper portion of the hermetic casing 11; a compression mechanism portion 13 provided at a lower portion of the hermetic casing 11; a rotary shaft 14 transmitting a rotational driving force of the motor 12 to the compression mechanism portion 13; a main bearing 15 rotatably supporting the rotary shaft 14; a sub bearing 16 rotatably supporting the rotary shaft 14 in cooperation with the main bearing 15; and an oil separation portion 17 separating lubricating oil mixed with a gas refrigerant from the gas refrigerant, the gas refrigerant being compressed by the compression mechanism portion 13 and discharged into the hermetic casing 11.

[0034] The hermetic casing 11 is cylindrical. The hermetic casing 11 includes a semispherical end plate and a cylindrical main body portion provided in an upper and lower relationship. The main body portion of the hermetic casing 11 includes a suction pipe 7b connected to the compression mechanism portion 13 and guiding a refrigerant into the compression mechanism portion 13. The suction pipe 7b is a portion of a refrigerant pipe 7 and is connected to a reservoir 6.

[0035] The end plate of the hermetic casing 11 at the upper side includes a discharge pipe 7a discharging the refrigerant from the rotary compressor 2. The discharge pipe 7a is connected to the refrigerant pipe 7.

[0036] The motor 12 generates a driving force for rotationally driving the compression mechanism portion 13. The motor 12 includes a stator 18 fixed to an inner wall of the hermetic casing 11 and a rotor 19 surrounded by the stator 18 and provided to the rotary shaft 14.

[0037] The oil separation portion 17 is provided to an upper surface of the rotor 19, i.e., a surface facing the end plate of the hermetic casing 11 at the upper side. In other words, the rotary compressor 2 includes the oil separation portion 17 at the upper portion of the motor 12. In addition, the discharge pipe 7a is located above a central portion of the oil separation portion 17.

[0038] The rotary shaft 14 connects the motor 12 and the compression mechanism portion 13 to each other. The rotary shaft 14 transmits the driving force generated by the motor 12 to the compression mechanism portion 13. An intermediate portion 14a of the rotary shaft 14 is rotatably supported by the main bearing 15. A lower end portion 14b of the rotary shaft 14 is rotatably supported by the sub bearing 16. The main bearing 15 and the sub bearing 16 are also portions of the compression mechanism portion 13 and sandwich the compression mechanism portion 13 in an upper and lower relationship. That is, the rotary shaft 14 penetrates the compression mechanism portion 13.

[0039] Further, the rotating shaft 14 has a plurality of eccentric portions 21 between the intermediate portion 14a supported by the main bearing 15 and the lower end portion 14b supported by the sub bearing 16. The side of the plurality of eccentric portions 21 closer to the main bearing 15 is referred to as a first eccentric portion 22, and the side closer to the sub bearing 16 is referred to as a second eccentric portion 23. Each of the eccentric portions 21 is a disc or a cylinder having a center different from the center of the rotating shaft 14. The center of each of the eccentric portions 21 is eccentric at a phase difference of about 180 degrees around the rotating shaft 14. The first eccentric portion 22 is disposed on the upper side closer to the motor 12, and the second eccentric portion 23 is disposed on the lower side farther from the motor 12.

[0040] The compression mechanism portion 13 sucks in and compresses and discharges the gaseous refrigerant by the rotational drive of the rotating shaft 14 by the motor 12. The compression mechanism portion 13 is housed in the hermetic case 11 and is disposed in the lower portion of the hermetic case 11. The lower portion of the hermetic case 11 is filled with lubricating oil (not shown). Most of the compression mechanism portion 13 is immersed in the lubricating oil.

[0041] The compression mechanism portion 13 has a plurality of compression mechanisms. That is, the compression mechanism portion 13 has: a first compression mechanism 25 provided in the hermetic case 11; a second compression mechanism 26 provided in the hermetic case 11; and a partition plate 27 provided between the first compression mechanism 25 and the second compression mechanism 26.

[0042] The first compression mechanism 25 has a first cylinder 32 having a circular first cylinder chamber 31 and a ring-shaped first roller 33 disposed in the first cylinder chamber 31. The second compression mechanism 26 has a second cylinder 42 having a circular second cylinder chamber 41 and a ring-shaped second roller 43 disposed in the second cylinder chamber 41.

[0043] The first cylinder 32 and the second cylinder 42 are disposed in a stacked manner in the axial direction of the rotating shaft 14. The upper first cylinder 32 is disposed on the side closer to the motor 12. The first cylinder 32 is fixed to the hermetic case 11 via the frame 24.

[0044] The frame 24 is fixed to the hermetic case 11 by a plurality of welding portions 51. The first cylinder 32 is fixed to the frame 24 by a fastening member such as a bolt. The welding portion 51 is formed, for example, by spot welding.

[0045] The center of the first cylinder chamber 31 and the second cylinder chamber 41 overlaps with the center of rotation of the rotation shaft 14. These cylinder chambers 31, 41 have substantially the same diameter size and the same height size, that is, the size in the axial direction of the rotation shaft 14. The first cylinder chamber 31 is a space on the inner side of the first cylinder 32, which is closed by the main bearing 15 and the partition plate 27. The first eccentric portion 22 of the rotation shaft 14 is disposed in the first cylinder chamber 31. The second cylinder chamber 41 is a space on the inner side of the second cylinder 42, which is closed by the partition plate 27 and the sub bearing 16. The second eccentric portion 23 of the rotation shaft 14 is disposed in the second cylinder chamber 41.

[0046] The upper main bearing 15 is fixed to the first cylinder 32 by a fastening member 52 such as a bolt. The compression mechanism portion 13 is provided with a first discharge valve mechanism (not shown) provided to the upper main bearing 15, which has a discharge port and a discharge valve that discharge the refrigerant compressed in the first cylinder chamber 31, and a first discharge muffler 53. The first discharge muffler 53 has a discharge hole (not shown). The first discharge muffler 53 covers the first discharge valve mechanism. The discharge port of the first discharge valve mechanism is connected to the first cylinder chamber 31. The discharge valve opens the discharge port when a predetermined pressure value is reached in the first cylinder chamber 31 due to the compression action of the compression mechanism portion 13, and discharges the compressed refrigerant into the first discharge muffler 53.

[0047] The lower sub bearing 16 is fixed to the first cylinder 32 by a fastening member 52 such as a bolt. The fastening member 52 penetrates the second cylinder 42 and the partition plate 27 to reach the first cylinder 32. The compression mechanism portion 13 is provided with a second discharge valve mechanism (not shown) provided to the lower sub bearing 16, which has a discharge port and a discharge valve that discharge the refrigerant compressed in the second cylinder chamber 41, and a second discharge muffler 54. The second discharge muffler 54 covers the second discharge valve mechanism. The discharge port of the second discharge valve mechanism is connected to the second cylinder chamber 41. The discharge valve opens the discharge port when a predetermined pressure value is reached in the second cylinder chamber 41 due to the compression action of the compression mechanism portion 13, and discharges the compressed refrigerant into the second discharge muffler 54.

[0048] The first roller 33 is fitted to the peripheral surface of the first eccentric portion 22 and accommodated in the first cylinder chamber 31. The first roller 33 performs eccentric motion while a part of the outer peripheral surface thereof contacts the inner peripheral surface line of the first cylinder chamber 31 along with the rotation of the rotation shaft 14. The second roller 43 is fitted to the peripheral surface of the second eccentric portion 23 and accommodated in the second cylinder chamber 41. The second roller 43 performs eccentric motion while a part of the outer peripheral surface thereof contacts the inner peripheral surface line of the second cylinder chamber 41 along with the rotation of the rotation shaft 14.

[0049] In addition, the contact of the first roller 33 with the first cylinder 32 and the contact of the second roller 43 with the second cylinder 42 are not direct contact but indirect contact via oil films (omitted from the drawing). For the sake of convenience of explanation, the contact via the oil films is simply expressed as "contact". The same applies to the contact between the first roller 33 and the first eccentric portion 22, the contact between the second roller 43 and the second eccentric portion 23, the contact between the first roller 33 and the main bearing 15, the contact between the second roller 43 and the sub bearing 16, the contact between the first roller 33 and the partition plate 27, and the contact between the second roller 43 and the partition plate 27.

[0050] Next, the rotor 19 of the electric motor 12 and the oil separation portion 17 will be described in detail.

[0051] Figure 2 is an axial sectional view of the rotor 19 of the rotary compressor 2 and the oil separation portion 17 according to the first embodiment of the present application.

[0052] On the basis of Figure 1 , as shown in Figure 2 , the rotor 19 of the electric motor 12 of the rotary compressor 2 according to the first embodiment of the present application is provided with: a core 83 having a small inner diameter core portion 81 having a small inner diameter Ds and a large inner diameter core portion 82 having a large inner diameter Dl larger than the small inner diameter Ds; a balancer 84; and a plurality of rivets 85 that integrate the rotor 19.

[0053] The core 83 is a laminate of the small inner diameter core portion 81 in which electromagnetic steel sheets 91 are laminated and the large inner diameter core portion 82 in which electromagnetic steel sheets 92 are laminated. The small inner diameter core portion 81 and the large inner diameter core portion 82 are laminates of the electromagnetic steel sheets 91, 92 that are different in shape from each other.

[0054] The core 83 has a gas refrigerant flow path hole 93 that penetrates the small inner diameter core portion 81 in the axial direction of the rotary shaft 14. That is, the gas refrigerant flow path hole 93 is provided in the plurality of electromagnetic steel sheets 91 that constitute the small inner diameter core portion 81. The gas refrigerant flow path hole 93 extends in parallel with respect to the rotational center line of the core 83. In addition, the rotational center line of the core 83 is also the rotational center line of the rotary shaft 14.

[0055] Further, the core 83 has a magnet insertion hole 94 that penetrates in the direction along the rotational center line of the core 83. That is, the magnet insertion hole 94 is provided in both the plurality of electromagnetic steel sheets 91 that constitute the small inner diameter core portion 81 and the plurality of electromagnetic steel sheets 92 that constitute the large inner diameter core portion 82. The magnet insertion hole 94 extends in parallel with respect to the rotational center line of the core 83. The drive permanent magnet 95 is embedded in the magnet insertion hole 94.

[0056] The outer diameter dimension of the small inner diameter core portion 81 is substantially the same as the outer diameter dimension of the large inner diameter core portion 82. In other words, the outer diameter dimension of the core 83 is substantially uniform. The outer peripheral surface of the core 83 opposes the inner peripheral surface of the stator 18. The small inner diameter core portion 81 has a hole, i.e., a small inner diameter Ds, for disposing the rotary shaft 14 and fixing the rotor 19 to the rotary shaft 14. The large inner diameter core portion 82 has a space S at the lower end portion side of the rotary shaft 14. The large inner diameter core portion 82 is fixed to the rotary shaft 14 via the adjacent small inner diameter core portion 81.

[0057] The gas refrigerant flow path hole 93 is connected to the space S partitioned by the large inner diameter core portion 82. After passing through the space S, the gas refrigerant flows toward the oil separation portion 17 through the gas refrigerant flow path hole 93.

[0058] The balancer 84 is a laminate of a plurality of plate members 96 of metal or the like. The balancer 84 is provided to both end surfaces of the core 83.

[0059] The rivet 85 penetrates the plurality of electromagnetic steel sheets 91 constituting the small inner diameter core portion 81, the plurality of electromagnetic steel sheets 92 constituting the large inner diameter core portion 82, and the plurality of plate members 96 constituting the balancer 84, and integrates them.

[0060] The oil separation portion 17 is a one-piece product of a plate member of metal formed by sheet metal processing, such as press working or draw working. The oil separation portion 17 has an oil separation disc 101, a cylindrical body 102, and a folded-back portion 103.

[0061] The oil separation disc 101 has a circular ring shape. The cylindrical body 102 is located at the center of the oil separation disc 101 and is recessed from the inner peripheral edge of the oil separation disc 101 toward the motor 12. In other words, the cylindrical body 102 has an inner side bottom portion at the motor 12 side. Further, the oil separation disc 101 can be said to have a circular ring shape that expands to the radial direction outside of the cylindrical body 102. The folded-back portion 103 has a front end surface that extends in the axial direction of the rotary shaft 14 from the outer peripheral edge of the oil separation disc 101 toward the motor 12.

[0062] The outer diameter dimension of the oil separation disc 101 is equal to the outer diameter dimension of the rotor 19. Therefore, the gas refrigerant that flows out to the outside of the rotor 19 through the gas refrigerant flow path hole 93 collides with the motor 12 side of the oil separation disc 101. Further, the oil separation disc 101 has at least one permanent magnet 104 at the motor 12 side. In other words, the rotary compressor 2 has at least one permanent magnet 104 provided to the oil separation portion 17. Details of the at least one permanent magnet 104 will be described later.

[0063] The outer diameter dimension of the cylindrical body 102 is equal to or greater than the outer diameter dimension of the rotation shaft 14. The cylindrical body 102 is fixed to the rotation shaft 14 by a bolt or the like fastening member 86 and via a plate material 87 disposed on the inner side bottom surface portion of the cylindrical body 102. Thus, the oil separation disc 101, the cylindrical body 102, and the return portion 103, i.e., the oil separation portion 17, rotate integrally with the rotation shaft 14 and the rotor 19.

[0064] Further, the oil separation disc 101 is located on the upper side of the rotor 19. The oil separation disc 101 is close to and opposed to the front end portion of the discharge pipe 7a that penetrates into the hermetic case 11.

[0065] As shown by the dotted arrows, Figure 2 As shown by the dotted arrows,

[0066] Assuming that the gas refrigerant mixed with the iron-based residue flows from the center portion of the oil separation disc 101 toward the radial outer side, in the case where the iron-based residue collides with the motor 12, the iron-based residue has a concern of causing burnout of the motor 12 due to a line-to-line short circuit, insulation paper damage. Further, the iron-based residue that collides with the motor 12 is again supplied to the compression mechanism portion 13 together with the lubricating oil that drips down to the lower side of the hermetic case 11, and has a concern of being mixed into the sliding portion as a foreign matter. The iron-based residue mixed as a foreign matter causes damage and excessive wear of the sliding portion.

[0067] Therefore, the rotary compressor 2 is provided with at least one permanent magnet 104 disposed on the motor 12 side of the oil separation disc 101. The at least one permanent magnet 104 captures the iron-based residue in the gas refrigerant. Therefore, the rotary compressor 2 reduces burnout of the motor 12 and damage of the sliding portion in the compression mechanism portion 13 due to the iron-based residue. Further, by disposing the at least one permanent magnet 104 in opposition to the outlet of the flow path of the gas refrigerant, i.e., the gas refrigerant flow path hole 93, the rotary compressor 2 efficiently captures the iron-based residue in the gas refrigerant.

[0068] Further, the at least one permanent magnet 104 efficiently captures the iron-based residue generated in the rotary compressor 2, i.e., the iron-based residue generated from the surface in the vicinity of the discharge port of the compression mechanism portion 13 or the frame 24 that supports the compression mechanism portion 13. Therefore, the rotary compressor 2 suppresses the iron-based residue from being mixed into the lubricating oil supplied to the surface of the motor 12 or the compression mechanism portion 13.

[0069] Further, the oil separation disc 101 is an integral product of the oil separation portion 17 formed by sheet metal processing, such as press working or draw working, of a metal plate as described above. The metal constituting the oil separation disc 101 is preferably a soft magnetic material. In the case where the metal constituting the oil separation disc 101 is a soft magnetic material, at least one permanent magnet 104 is attached to the oil separation disc 101 by magnetic force. The attachment of at least one permanent magnet 104 by magnetic force does not require a fastening member such as a bolt. Therefore, the attachment of the permanent magnet 104 can be easily performed without reducing the manufacturability of the rotary compressor 2.

[0070] Figure 3 is an axial sectional view and a bottom view of the oil separation portion 17 of the rotary compressor 2 according to the first embodiment of the present application.

[0071] As shown in Figure 3 , at least one permanent magnet 104 according to the first embodiment of the present application can include a first permanent magnet 104a having a circular ring shape. In other words, the shape of the first permanent magnet 104a is preferably similar to that of the oil separation disc 101. In Figure 3 , the first permanent magnet 104a is disposed on the motor 12 side of the oil separation disc 101.

[0072] By making the first permanent magnet 104a similar in shape to the oil separation disc 101, the entire surface of the lower surface of the oil separation disc 101 becomes a magnetic adsorption surface. That is, the rotary compressor 2 maximizes the area for capturing iron-based residual substances by magnetic force. At this time, the rotary compressor 2 captures iron-based residual substances in the gaseous refrigerant without impairing the oil separation function of the oil separation disc 101.

[0073] On the other hand, in the case where the shape of the first permanent magnet 104a is different from that of the oil separation disc 101, by embedding the first permanent magnet 104a, the weight balance of the oil separation disc 101 is shifted, and the center of gravity of the motor 12 is concerned to be shifted from the center of the rotation shaft 14. When the center of gravity of the motor 12 is shifted from the center of the rotation shaft 14, problems such as noise, vibration, and malfunction can occur. Therefore, if the shapes of the first permanent magnet 104a and the oil separation disc 101 are similar to each other as circular ring shapes, even if the first permanent magnet 104a is embedded and attached to the oil separation disc 101, the center of gravity of the motor 12 is not concerned to be shifted from the center of the rotation shaft 14. That is, the rotary compressor 2 suppresses the generation of noise, vibration, and malfunction.

[0074] Preferably, the height dimension (thickness dimension) of the first permanent magnet 104a is smaller than the height dimension of the return portion 103. The iron-based sludge that is wrapped up with the gas refrigerant in the compression mechanism portion 13 collides with the oil separation disk 101 after passing through the gas refrigerant flow path hole 93 of the rotor 19. The iron-based sludge that collides with the oil separation disk 101 splashes to the outside in the radial direction of the rotary shaft 14 due to the centrifugal force that acts with the rotation of the rotary shaft 14. The iron-based sludge that splashes to the outside in the radial direction of the rotary shaft 14 is again trapped in the circumferential periphery of the rotary shaft 14 after colliding with the return portion 103, and is captured by the first permanent magnet 104a provided to the oil separation disk 101. That is, by making the height dimension of the first permanent magnet 104a smaller than the height dimension of the return portion 103, the rotary compressor 2 efficiently captures the iron-based sludge that is bounced to the circumferential periphery of the rotary shaft 14 by the return portion 103 in the first permanent magnet 104a.

[0075] Further, in the case where the iron-based sludge that is captured in the first permanent magnet 104a splashes to the outside in the radial direction of the oil separation disk 101 due to the centrifugal force that acts with the rotation of the rotary shaft 14, the iron-based sludge also collides with the return portion 103 and is again captured in the first permanent magnet 104a and stays. Therefore, the rotary compressor 2 prevents the iron-based sludge from colliding with the stator 18.

[0076] In the case where the oil separation disk 101 is composed of a soft magnetic material, like Figure 3 Such an oil separation disk 101 has a permanent magnet 104 (first permanent magnet 104a) on the motor 12 side, and therefore the discharge pipe 7a side of the oil separation disk 101 also has magnetism. The discharge pipe 7a is positioned above the central portion of the oil separation portion 17, that is, above the central portion of the oil separation disk 101. Therefore, at the time of operation stop of the rotary compressor 2, the rotary compressor 2 captures the iron-based sludge contained in the gas refrigerant that flows backward from the discharge pipe 7a into the hermetic case 11 in the discharge pipe 7a side of the oil separation disk 101 that has magnetism, by at least one permanent magnet 104. That is, the rotary compressor 2 captures the iron-based sludge on both the motor 12 side and the discharge pipe 7a side by the magnetic force of the permanent magnet 104 by providing at least one permanent magnet 104 on the motor 12 side of the oil separation disk 101.

[0077] Further, it is preferable that at least one permanent magnet 104 is made of any one of a rare earth magnet including neodymium (Nd), didymium (Di), and terbium (Tb) as main components, a rare earth magnet including neodymium (Nd), didymium (Di), terbium (Tb), and dysprosium (Dy) as main components, or a rare earth magnet including samarium (Sm) and cobalt (Co) as main components. At least one permanent magnet 104 made of any one of these rare earth magnets having high magnetic properties is more firmly attached to the oil separating disc 101. Therefore, the rotary compressor 2 can easily capture the iron-based residual matter in the gaseous refrigerant, and further, prevent the captured iron-based residual matter from falling off from the permanent magnet 104 to be again trapped in the hermetic case 11.

[0078] Further, the side of the discharge pipe 7a of the oil separating disc 101 made of the soft magnetic material is also strengthened by the magnetism of at least one permanent magnet 104. Therefore, the rotary compressor 2 more efficiently captures the iron-based residual matter contained in the gaseous refrigerant flowing backward from the discharge pipe 7a.

[0079] As described above, the rotary compressor 2 and the refrigeration cycle apparatus 1 according to the first embodiment are provided with the oil separating portion 17 provided at the upper portion of the motor 12 and at least one permanent magnet 104 provided at the oil separating portion 17. Therefore, the rotary compressor 2 and the refrigeration cycle apparatus 1 can capture the iron-based residual matter from the gaseous refrigerant containing the iron-based residual matter passing through the gaseous refrigerant flow path hole 93 provided at the upper portion (end portion) of the rotor 19 of the motor 12 by the magnetic force of at least one permanent magnet 104. Therefore, the rotary compressor 2 and the refrigeration cycle apparatus 1 can suppress the damage of the motor 12 and the compression mechanism portion 13 caused by the iron-based residual matter, thereby obtaining high reliability.

[0080] Further, the rotary compressor 2 and the refrigeration cycle apparatus 1 according to the first embodiment are provided with at least one permanent magnet 104 provided at the motor 12 side of the oil separating disc 101. The gaseous refrigerant containing the iron-based residual matter passing through the gaseous refrigerant flow path hole 93 collides with the face of the motor 12 side of the oil separating disc 101. Therefore, the rotary compressor 2 and the refrigeration cycle apparatus 1 can more efficiently capture the iron-based residual matter contained in the gaseous refrigerant by the magnetic force of at least one permanent magnet 104.

[0081] Further, the rotary compressor 2 and the refrigeration cycle device 1 according to the first embodiment are provided with the first permanent magnet 104a of a circular ring shape which is embedded and installed in the oil separation disc 101. The first permanent magnet 104a has a shape which is similar to the shape of the oil separation disc 101. By embedding and installing the first permanent magnet 104a in the motor 12 side of the oil separation disc 101, the entire surface of the lower surface of the oil separation disc 101 becomes a magnetic adsorption surface. That is, the rotary compressor 2 and the refrigeration cycle device 1 can maximize the area of the lower surface of the oil separation disc 101 which captures the iron-based residual substances by magnetic force. Therefore, the rotary compressor 2 and the refrigeration cycle device 1 can more efficiently capture the iron-based residual substances contained in the gaseous refrigerant.

[0082] Further, the rotary compressor 2 and the refrigeration cycle device 1 according to the first embodiment are provided with the first permanent magnet 104a which has a height dimension smaller than the height dimension of the return portion 103. Therefore, the rotary compressor 2 and the refrigeration cycle device 1 can efficiently capture the iron-based residual substances which are bounced by the return portion 103 to the circumferential periphery of the rotary shaft 14 in the first permanent magnet 104a.

[0083] Further, the rotary compressor 2 and the refrigeration cycle device 1 according to the first embodiment are provided with at least one permanent magnet 104 which is any one of a rare earth magnet including neodymium (Nd), neodymium praseodymium (Di), and terbium (Tb), a rare earth magnet including neodymium (Nd), neodymium praseodymium (Di), terbium (Tb), and dysprosium (Dy), or a rare earth magnet including samarium (Sm) and cobalt (Co). These rare earth magnets have high magnetic properties. Therefore, by the strong magnetic force of the at least one permanent magnet 104, the rotary compressor 2 and the refrigeration cycle device 1 can more easily capture the iron-based residual substances contained in the gaseous refrigerant. Further, by the strong magnetic force of the at least one permanent magnet 104, the rotary compressor 2 and the refrigeration cycle device 1 can prevent the captured iron-based residual substances from falling off from the at least one permanent magnet 104 and staying again in the hermetic case 11.

[0084] (Second Embodiment)

[0085] Figure 4 is an axial sectional view and a bottom view of the oil separation portion 17 of the rotary compressor 2 according to the second embodiment of the present application. In addition, regarding each portion of the second embodiment, the same configuration and the same effects as those of the first embodiment are not described. The same applies to the third embodiment and the fourth embodiment described below.

[0086] As Figure 4As shown, the second embodiment of the present invention may also include a first permanent magnet 104 disposed on the side of the motor 12 of the oil separator 101 and a second permanent magnet 104b disposed on the inner circumferential surface of the circumferential fold-back portion 103.

[0087] Iron-based residues in the gaseous refrigerant flowing through the gaseous refrigerant flow path 93 are splashed towards the return section 103 after colliding with the oil separator 101 due to the centrifugal force generated by the rotation of the rotating shaft 14. The second permanent magnet 104b efficiently captures the iron-based residues in the gaseous refrigerant splashed into the return section 103.

[0088] The shape of the second permanent magnet 104b is preferably similar to that of the folded-back portion 103 that is provided around the entire outer periphery of the oil separator 101, and is a uniform cylindrical shape, so that the center of gravity of the motor 12 does not deviate from the center of the rotating shaft 14.

[0089] As explained above, the rotary compressor 2 and refrigeration cycle device 1 according to the second embodiment of the present invention include a second permanent magnet 104b disposed on the inner peripheral surface of the return section 103. Therefore, after the gaseous refrigerant containing ferrous residue collides with the oil separator 101, the rotary compressor 2 and refrigeration cycle device 1 can efficiently capture the ferrous residue in the gaseous refrigerant that splashes into the return section 103 due to the centrifugal force acting with the rotation of the rotating shaft 14.

[0090] (Third Implementation)

[0091] Figure 5 This is an axial sectional view and a bottom view of the oil separation section 17 of the rotary compressor 2 according to the third embodiment of this utility model.

[0092] like Figure 5 As shown, the at least one permanent magnet 104 involved in the third embodiment of this utility model may also include a first permanent magnet 104a disposed on the side of the motor 12 of the oil separator 101 and a third permanent magnet 104c disposed on the inner bottom part of the cylindrical body 102.

[0093] The cylindrical body 102 is positioned above and close to the front end of the discharge pipe 7a, which extends into the sealed housing 11. That is, the third permanent magnet 104c is located directly below the front end of the discharge pipe 7a. Therefore, the third permanent magnet 104c more reliably captures iron residues contained in the gaseous refrigerant flowing back from the discharge pipe 7a into the sealed housing 11 when the rotary compressor 2 stops operating.

[0094] Furthermore, the shape of the third permanent magnet 104c is preferably a roughly disc-shaped structure that approximates the shape of the inner bottom surface of the cylindrical body 102, so that the center of gravity of the motor 12 does not deviate from the center of the rotation shaft 14. In this case, the third permanent magnet 104c can also replace the plate 87. The cylindrical body 102 is fixed to the rotation shaft 14 by a fastening member 86, which is inserted into a through hole (not shown) provided in the third permanent magnet 104c.

[0095] As explained above, the rotary compressor 2 and refrigeration cycle device 1 according to the third embodiment of this utility model include a third permanent magnet 104c disposed on the inner bottom surface of the cylindrical body 102. Therefore, when the rotary compressor 2 stops operating, the rotary compressor 2 and refrigeration cycle device 1 can efficiently capture iron-based residues contained in the gaseous refrigerant flowing back from the discharge pipe 7a into the sealed housing 11. Furthermore, by capturing iron-based residues inside the cylindrical body 102, the rotary compressor 2 and refrigeration cycle device 1 can prevent iron-based residues from falling off the oil separator 17 due to the centrifugal force accompanying the rotation of the oil separator 17 or the influence of the flow of refrigerant flowing within the sealed housing 11.

[0096] (Fourth Implementation)

[0097] Figure 6 This is an axial sectional view and a bottom view of the oil separation section 17 of the rotary compressor 2 according to the fourth embodiment of this utility model.

[0098] like Figure 6 As shown, the at least one permanent magnet 104 involved in the fourth embodiment of the present invention may also include a first permanent magnet 104a disposed on the side of the motor 12 of the oil separator 101 and a fourth permanent magnet 104d disposed throughout the entire circumference of the bottom inner circumferential surface of the cylindrical body 102.

[0099] The fourth permanent magnet 104d and Figure 5 Similarly, in the third embodiment shown, when the rotary compressor 2 stops operating, iron residues contained in the gaseous refrigerant flowing back from the discharge pipe 7a into the sealed housing 11 are captured.

[0100] Furthermore, the shape of the fourth permanent magnet 104d is preferably similar to that of the cylindrical body 102 and is a uniform cylindrical shape, so that the center of gravity of the motor 12 does not deviate from the center of the rotation axis 14.

[0101] As explained above, the rotary compressor 2 and the refrigeration cycle device 1 according to the fourth embodiment of the present application are provided with the fourth permanent magnet 104d provided on the inner circumferential surface of the bottom of the cylindrical body 102 over the entire circumference. Therefore, the rotary compressor 2 and the refrigeration cycle device 1 can capture the iron-based residue contained in the gas refrigerant flowing backward from the discharge pipe 7a into the hermetic case 11 at the time of operation stop of the rotary compressor 2.

[0102] (Other Embodiments)

[0103] Further, the at least one permanent magnet 104 can be used in various ways other than those described in the first to fourth embodiments. For example, as shown in FIG. 6, the at least one permanent magnet 104 can include the first permanent magnet 104a provided on the motor 12 side of the oil separation disc 101 and the fifth permanent magnet 104e provided on the discharge pipe 7a side of the oil separation disc 101 on the upper side. Figure 3

[0104] In addition to the gas refrigerant drawn into the discharge pipe 7a from the hermetic case 11 at the time of operation of the rotary compressor 2, the first permanent magnet 104a and the fifth permanent magnet 104e also capture the iron-based residue contained in the gas refrigerant flowing backward from the discharge pipe 7a into the hermetic case 11 at the time of operation stop of the rotary compressor 2 by a stronger magnetic force.

[0105] Further, the shape of the fifth permanent magnet 104e is preferably a circular ring shape similar to the shape of the oil separation disc 101 so that the center of gravity of the motor 12 does not deviate from the center of the rotary shaft 14. That is, the shape of the first permanent magnet 104a and the shape of the fifth permanent magnet 104e are mutually similar circular ring shapes.

[0106] Further, in the case where the fifth permanent magnet 104e is provided on the discharge pipe 7a side of the oil separation disc 101, another return portion 105 different from the return portion 103 is preferably provided extending from the outer periphery of the oil separation disc 101 in the axial direction of the rotary shaft 14 with the front end thereof facing the discharge pipe 7a side. The other return portion 105 prevents the fifth permanent magnet 104e from falling off due to centrifugal force acting with rotation of the rotary shaft 14.

[0107] The iron-based residue captured by the fifth permanent magnet 104e sometimes falls off from the fifth permanent magnet due to centrifugal force acting with rotation of the rotary shaft 14 and splashes to the outside in the radial direction of the oil separation disc 101. In this case, the other return portion 105 retains the splashed iron-based residue and prevents the iron-based residue from colliding with the stator 18.

[0108] ​In addition, at least one permanent magnet 104 of the above-described several embodiments can be used in appropriate combination of a part thereof. That is, at least one permanent magnet 104 can include at least one or more of the first permanent magnet 104a and the second permanent magnet 104b to the fifth permanent magnet 104e.

[0109] The several embodiments of the present application have been described, but these embodiments are presented as examples and are not intended to limit the scope of the present application. These new embodiments can be implemented in other various ways, and various omissions, substitutions, and changes can be made without departing from the spirit of the present application. These embodiments and modifications thereof are included in the scope and spirit of the present application, and are included in the content recited in the claims and the scope equivalent thereto.

[0110] Explanation of Reference Signs

[0111] 1 Refrigeration cycle device

[0112] 2 Rotary compressor

[0113] 3 Condenser

[0114] 4 Expansion device

[0115] 5 Evaporator

[0116] 6 Accumulator

[0117] 7 Refrigerant pipe

[0118] 7a Discharge pipe

[0119] 7b Suction pipe

[0120] 11 Hermetic case

[0121] 12 Motor

[0122] 13 Compression mechanism section

[0123] 14 Rotary shaft

[0124] 14a Middle section

[0125] 14b Lower end section

[0126] 15 Main bearing

[0127] 16 Sub bearing

[0128] 17 Oil separation section

[0129] 18 Stator

[0130] 19 Rotor

[0131] 21 Eccentric section

[0132] 22 first eccentric portion

[0133] 23 second eccentric portion

[0134] 24 frame

[0135] 25 first compression mechanism

[0136] 26 second compression mechanism

[0137] 27 partition plate

[0138] 31 first cylinder chamber

[0139] 32 first cylinder

[0140] 33 first roller

[0141] 41 second cylinder chamber

[0142] 42 second cylinder

[0143] 43 second roller

[0144] 51 welding portion

[0145] 52, 86 fastening member

[0146] 53 first discharge muffler

[0147] 54 second discharge muffler

[0148] 81 small inner diameter core portion

[0149] 82 large inner diameter core portion

[0150] 83 core

[0151] 84 balancer

[0152] 85 rivet

[0153] 87, 96 plate

[0154] 91, 92 electromagnetic steel sheet

[0155] 93 gas refrigerant flow path hole

[0156] 94 magnet insertion hole

[0157] 95 drive permanent magnet

[0158] 101 oil separation disc

[0159] 102 cylindrical body

[0160] 103, 105 folded-back portion

[0161] 104 permanent magnet

[0162] 104a first permanent magnet

[0163] 104b second permanent magnet

[0164] 104c third permanent magnet

[0165] 104d fourth permanent magnet

[0166] 104e fifth permanent magnet

Claims

1. A rotary compressor characterized by comprising: Possessing: A closed housing; An electric motor housed in an upper portion of the closed housing, having a stator and a rotor; A compression mechanism portion housed in a lower portion of the closed housing, linked to the rotor through a rotating shaft; An oil separation portion provided in an upper portion of the electric motor; At least one permanent magnet provided in the oil separation portion.

2. The rotary compressor of claim 1, wherein The oil separation portion possesses: A cylindrical body located at the center of the rotor, fixed to the rotating shaft; An oil separation disc of a circular ring shape, expanding to a radial direction outside of the cylindrical body; A folded-back portion extending from an outer periphery of the oil separation disc toward the electric motor along an axial direction of the rotating shaft, The at least one permanent magnet is provided on the electric motor side of the oil separation disc.

3. The rotary compressor of claim 2, wherein The at least one permanent magnet includes a first permanent magnet of a circular ring shape embeddedly installed in the oil separation disc.

4. The rotary compressor of claim 3, wherein A height dimension of the first permanent magnet is smaller than a height dimension of the folded-back portion.

5. The rotary compressor according to any one of claims 1 to 4, wherein The at least one permanent magnet is any one of a rare earth magnet including neodymium (Nd), didymium (Di), and terbium (Tb), a rare earth magnet including neodymium (Nd), didymium (Di), terbium (Tb), and dysprosium (Dy), or a rare earth magnet including samarium (Sm) and cobalt (Co).

6. The rotary compressor according to claim 3 or 4, wherein The at least one permanent magnet includes a second permanent magnet provided in the folded-back portion.

7. The rotary compressor according to any one of claims 3, 4 and 6, wherein The at least one permanent magnet includes at least any one of a third permanent magnet and a fourth permanent magnet provided in the cylindrical body.

8. The rotary compressor according to any one of claims 3, 4, 6 and 7, wherein The rotary compressor possesses a discharge pipe provided extending from an upper end of the closed housing toward the oil separation portion, The at least one permanent magnet includes a fifth permanent magnet provided on the discharge pipe side of the oil separation disc.

9. A refrigeration cycle apparatus characterized by comprising: Possessing: The rotary compressor of any one of claims 1 to 8; A condenser; An expansion device; An evaporator; A refrigerant pipe connecting the rotary compressor, the condenser, the expansion device, and the evaporator to circulate a refrigerant.

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