Rotary compressor and apparatus

Abstract

A rotary compressor (1) includes a compression mechanism portion (30) having a cylinder (31), a piston (32), and a vane (33), a shaft (40) having an eccentric portion (42) disposed in the cylinder, a groove being formed in the cylinder, the piston being fitted to the eccentric portion, and a cylindrical groove (32a) having an arc angle (alpha) exceeding 180 degrees being formed in the piston. A cylindrical portion (33b) disposed in the cylindrical groove is formed at an end portion of the blade, the blade (33) operates without leaving the piston, a cutout portion (33d) is formed in the cylindrical portion from one end surface to the other end surface of the cylindrical portion, an arc surface (33e) of the cylindrical portion is divided into a plurality of portions by the cutout portion, each arc surface is set to have an arc angle [beta] of less than 180 DEG, and the arc angle [beta] is greater than 180 DEG. The cutout section (33d) has an arc angle [gamma] of less than 45 DEG, and the machining accuracy of the arc surface of the cylindrical section can be improved.

Description

Technical Field

[0001] The present invention relates to a rotary compressor in which blades operate without separating from a piston and an apparatus using the rotary compressor. Background Art

[0002] Patent Document 1 discloses a rotary compressor in which a cylindrical groove is formed in a piston and a cylindrical portion is formed at the end of a vane to be arranged in the cylindrical groove, thereby allowing a vane to operate without separating from the piston.

[0003] Patent Document 2 discloses a compressor in which a D-cut is performed on the side surface of a cylindrical portion of a blade in order to improve the workability of the blade side surface.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Laid-Open No. 3-185291

[0007] Patent Document 2: Japanese Patent Application Laid-Open No. 2012-237317 Summary of the Invention

[0008] Problems to be solved by the invention

[0009] The blade end is fitted into a groove provided in the piston, and the blade cylindrical portion and the piston groove slide in the circumferential direction, so the piston groove and the blade cylindrical portion need to be finished with high precision.

[0010] If the blade cylindrical portion has an arc angle exceeding 180°, it is necessary to perform finish machining on the blade cylindrical portion in two or more steps. The joints between the machined surfaces cause a decrease in the accuracy of the cylindrical portion.

[0011] Therefore, an object of the present invention is to provide a rotary compressor capable of improving the machining accuracy of the arcuate surface of a cylindrical portion and an apparatus using the rotary compressor.

[0012] Methods for solving problems

[0013] In a first aspect of the present invention, there is provided a rotary compressor 1 having a motor part 20 and a compression mechanism part 30 in a sealed container 10. The motor part 20 and the compression mechanism part 30 are connected by a shaft 40. The compression mechanism part 30 has a cylinder 31, a piston 32 disposed in the cylinder 31, and a vane 33 that divides the inside of the cylinder 31. The shaft 40 has an eccentric part 42. A groove for disposing the vane 33 is formed in the cylinder 31. The eccentric part 42 is disposed in the cylinder 31. The piston 32 is fitted with the eccentric part 42. A cylindrical groove 32a with an arc angle α exceeding 180° is formed in the piston 32. A cylindrical part 33b disposed in the cylindrical groove 32a is formed at the end of the vane. The vane 33 operates without leaving the piston 32. The rotary compressor 1 is characterized in that a notch part 33d extending from one end face to the other end face of the cylindrical part 33b is formed in the cylindrical part 33b. The arc surface 33e of the cylindrical part 33b is divided into a plurality of parts by the notch part 33d, and each of the arc surfaces 33e is set to an arc angle β less than 180°. The notch part 33d is set to an arc angle γ less than 45°.

[0014] Based on the first aspect, a rotary compressor 1 according to a second aspect of the present invention is characterized in that the notch part 33d is formed at the vane tip of the vane 33.

[0015] Based on the first or second aspect, a rotary compressor 1 according to a third aspect of the present invention is characterized in that at least two separated arc surfaces 33e are formed on the outer peripheral surface of the cylindrical part 33b, and the two formed arc surfaces 33e are disposed at the position closest to the extended imaginary plane X on the side surface of the vane 33.

[0016] In a fourth aspect of the present invention, there is provided a device using the rotary compressor 1 according to the first or second aspect, characterized in that the rotary compressor 1, a condenser 2, a decompression device 3, and an evaporator 4 are connected in a ring shape through pipes.

[0017] Advantages of the Invention

[0018] According to the present invention, by dividing the arc surface of the cylindrical part into a plurality of parts using a notch part extending from one end face to the other end face of the cylindrical part and setting each arc surface to an arc angle less than 180°, the machining accuracy of the arc surface of the cylindrical part can be improved. By setting the notch part to an arc angle less than 45°, the contact area between the cylindrical groove and the cylindrical part can be increased, and refrigerant leakage can be reliably prevented. Description of the Drawings

[0019] Figure 1 It is a cross-sectional view showing a rotary compressor according to an embodiment of the present invention.

[0020] Figure 2 Is Figure 1 The view taken along the cutting line A-A shown in the figure below.

[0021] Figure 3 It is a diagram showing a piston and a vane for a rotary compressor of the same embodiment.

[0022] Figure 4 It is a diagram showing the manufacturing process of a vane for a rotary compressor of the same embodiment.

[0023] Explanation of Reference Numerals

[0024] 1 Rotary Compressor

[0025] 2 Condenser

[0026] 3 Pressure Reducing Device

[0027] 4 Evaporator

[0028] 10 Sealed Container

[0029] 11 Oil Storage Section

[0030] 12 Suction Pipe

[0031] 13 Discharge Pipe

[0032] 14 Accumulator

[0033] 14a Outer Cylinder

[0034] 14b Refrigerant Suction Pipe

[0035]

[0036] 14d Outer Cylinder Inlet

[0037] 14e Suction Pipe Inlet

[0038] 14f Liquid Storage Section

[0039] 20 Motor Section

[0040] 21 Stator

[0041] 22 Rotor

[0042] 30 Compression Mechanism Section

[0043] 31 Cylinder

[0044] 32 Piston

[0045] 32a Cylindrical Groove

[0046] 33 Vane

[0047] 33a Vane Side Surface ​

[0048] 33b Cylindrical part

[0049] 33c Narrowing part

[0050] 33d Notch part

[0051] 33e Arc surface

[0052] 33e1 Suction side arc surface

[0053] 33e2 Discharge side arc surface

[0054] 34 Compression chamber

[0055] 34a Suction space

[0056] 34b Compression space

[0057] 35 Suction passage

[0058] 36 Vane slot

[0059] 37 Discharge hole

[0060] 40 Shaft

[0061] 41 Main shaft part

[0062] 42 Eccentric part

[0063] 43 Sub - shaft part

[0064] 46 Oil supply passage inside the shaft

[0065] 47 Connecting passage

[0066] 51 Upper bearing

[0067] 52 Lower bearing

[0068] 53 Upper cover

[0069] 54 Sound - proof chamber

[0070] H Height

[0071] M Connected surface

[0072] X Extended imaginary surface

[0073] Y Fixture

[0074] Z Cutting tool

[0075] α, β, γ Arc angles Specific implementation mode

[0076] In the rotary compressor according to the first embodiment of the present invention, a notch portion is formed on the cylindrical portion from one end surface to the other end surface of the cylindrical portion. The arc surface of the cylindrical portion is divided into a plurality of parts through the notch portion, each arc surface is set to an arc angle less than 180°, and the notch portion is set to an arc angle less than 45°. In order to form a cylindrical portion with an arc angle exceeding 180°, finish machining needs to be carried out more than twice, and the machining accuracy at the connecting surface of the machining surfaces is reduced. However, according to the present embodiment, by dividing the arc surface of the cylindrical portion into a plurality of parts through the notch portion from one end surface to the other end surface of the cylindrical portion and setting each arc surface to an arc angle less than 180°, the machining accuracy of the arc surface of the cylindrical portion can be improved. By setting the notch portion to an arc angle less than 45°, the contact area between the cylindrical groove and the cylindrical portion can be increased, and refrigerant leakage can be reliably prevented.

[0077] Based on the rotary compressor according to the first embodiment of the present invention, the second embodiment of the present invention forms the notch portion at the front end portion of the vane. According to the present embodiment, it is not easy to apply a load to the front end portion of the vane, and the suction side arc surface and the discharge side arc surface can be symmetrically formed through the notch portion.

[0078] Based on the rotary compressor according to the first or second embodiment of the present invention, the third embodiment of the present invention forms arc surfaces on the outer peripheral surface of the cylindrical portion that are separated into at least two parts through the notch portion, and arranges the two formed arc surfaces at the position closest to the extended imaginary plane X on the side surface of the vane. According to the present embodiment, refrigerant leakage can be reliably prevented.

[0079] The device according to the fourth embodiment of the present invention uses the rotary compressor according to the first or second embodiment, wherein the rotary compressor, the condenser, the decompression device, and the evaporator are connected in a ring shape through pipes. According to the present embodiment, a device with high reliability can be provided.

[0080]

Embodiment

[0081] Figure 1 It is a cross-sectional view showing a rotary compressor according to an embodiment of the present invention, Figure 2 is Figure 1 the view taken along the line A-A shown.

[0082] The rotary compressor 1 of the present embodiment includes a motor portion 20 and a compression mechanism portion 30 in a sealed container 10. The motor portion 20 and the compression mechanism portion 30 are connected by a shaft 40.

[0083] The motor portion 20 is composed of a stator 21 fixed on the inner surface of the sealed container 10 and a rotor 22 rotating inside the stator 21.

[0084] The compression mechanism portion 30 has a cylinder 31, a piston 32 disposed in the cylinder 31, and a vane 33 that divides the inside of the cylinder 31 (refer to Figure 2)。

[0085] An upper bearing 51 is disposed on one side of the cylinder 31, and a lower bearing 52 is disposed on the other side of the cylinder 31.

[0086] The shaft 40 is composed of a main shaft portion 41 that mounts the rotor 22 and is supported by the upper bearing 51, an eccentric portion 42 for mounting the piston 32, and a sub-shaft portion 43 that is supported by the lower bearing 52.

[0087] The upper bearing 51 is fixed to the hermetic container 10. The piston 32 is rotatably fitted to the eccentric portion 42 of the shaft 40 passing through the inside of the cylinder 31.

[0088] An upper cover 53 is provided above the upper bearing 51. A soundproof chamber 54 is formed between the upper bearing 51 and the upper cover 53. The high-pressure refrigerant gas compressed by the compression mechanism portion 30 is discharged into the soundproof chamber 54. The high-pressure refrigerant gas discharged into the soundproof chamber 54 is discharged into the hermetic container 10.

[0089] An oil storage portion 11 is formed at the bottom inside the hermetic container 10. The oil storage portion 11 stores refrigeration oil. An oil supply passage 46 is formed axially inside the shaft 40. A communication passage 47 for supplying refrigeration oil to the sliding surface of the compression mechanism portion 30 is formed inside the eccentric portion 42.

[0090] The refrigeration oil in the oil storage portion 11 is introduced into the oil supply passage 46 from the lower end of the shaft 40. A part of the refrigeration oil introduced into the oil supply passage 46 is supplied to the sliding surface of the compression mechanism portion 30 through the communication passage 47.

[0091] An intake pipe 12 is connected to the side surface of the hermetic container 10, and a discharge pipe 13 is connected to the upper surface of the hermetic container 10. The intake pipe 12 guides the refrigerant to the compression mechanism portion 30. The discharge pipe 13 guides the refrigerant compressed by the compression mechanism portion 30 and discharged into the hermetic container 10 to the outside of the hermetic container 10.

[0092] An accumulator 14 is provided on the upstream side of the intake pipe 12.

[0093] In the rotary compressor 1 of the present embodiment, the condenser 2, the decompression device 3, and the evaporator 4 are connected in a ring shape through pipes. The condenser 2 condenses the refrigerant discharged from the discharge pipe 13. The decompression device 3 decompresses the refrigerant condensed by the condenser 2. The evaporator 4 evaporates the refrigerant decompressed by the decompression device 3.

[0094] The refrigerant evaporated by the evaporator 4 returns to the accumulator 14.

[0095] The accumulator 14 has an outer cylinder 14a, a refrigerant suction pipe 14b, and a separation plate 14c. An outer cylinder inlet 14d for introducing refrigerant from the evaporator 4 is provided at the upper part of the outer cylinder 14a. The refrigerant suction pipe 14b has a suction pipe inlet 14e inside the outer cylinder 14a. The separation plate 14c is disposed between the outer cylinder inlet 14d and the suction pipe inlet 14e.

[0096] A liquid storage portion 14f is formed at the inner bottom of the outer cylinder 14a. Liquid refrigerant is stored in the liquid storage portion 14f. The liquid refrigerant can be stored up to the height H of the suction pipe inlet 14e. Accordingly, the volume up to the height H of the suction pipe inlet 14e becomes the volume of the liquid storage portion 14f.

[0097] In addition, the specific driving method of the rotary compressor 1 is not particularly limited. For example, the rotary compressor 1 may be driven by simple on-off control, but may also be driven in an inverter manner at multiple operating frequencies. In the inverter drive, a low rotation region where the rotational speed of the motor unit 20 decreases or a high rotation region where the rotational speed of the motor unit 20 increases is generated in order to optimize the operation control of the rotary compressor 1.

[0098] Figure 2 The compression chamber 34 shown is formed between the upper bearing 51 and the lower bearing 52 and between the inner peripheral surface of the cylinder 31 and the outer peripheral surface of the piston 32.

[0099] The suction pipe 12 is connected to the suction passage 35 of the compression mechanism portion 30.

[0100] The suction passage 35 communicates with the compression chamber 34.

[0101] By the rotation of the shaft 40, the piston 32 makes a revolution motion.

[0102] The vane 33 reciprocates in the vane groove 36 by the piston 32 that revolves along the inner wall surface of the cylinder 31.

[0103] The compression chamber 34 is divided by the vane 33 into a suction space 34a communicating with the suction passage 35 and a compression space 34b communicating with the discharge hole 37. The suction volume formed in the cylinder 31 is the volume of the suction space 34a in a state where the suction passage 35 is blocked by the piston 32, and is the volume in a state where the suction space 34a becomes the maximum space.

[0104] The gaseous refrigerant sucked from the suction pipe 12 through the suction passage 35 into the compression chamber 34 by the revolution motion of the piston 32 is compressed in the compression chamber 34 and then discharged from the discharge hole 37 into the soundproof chamber 54.

[0105] The refrigerant gas discharged into the soundproof chamber 54 is discharged into the closed container 10 and discharged outside the closed container 10 from the discharge pipe 13. The high-pressure refrigerant gas discharged outside the closed container 10 becomes low-pressure refrigerant gas via the condenser 2, the decompression device 3, and the evaporator 4, and returns to the compression mechanism portion 30 via the accumulator 14.

[0106] Figure 3 It is a diagram showing the piston and vane for a rotary compressor of the same embodiment. Figure 3 (a) is a perspective view showing the piston and vane in a separated state. Figure 3 (b) is a top view showing the piston and vane in a separated state. Figure 3 (c) is a perspective view of the vane observed from a different direction.

[0107] A cylindrical groove 32a with an arc angle α exceeding 180° is formed on the outer peripheral surface of the piston 32. The cylindrical groove 32a extends from one end face of the piston 32 to the other end face.

[0108] The vane 33 has a vane side surface portion 33a that slides with the vane groove 36, a cylindrical portion 33b disposed in the cylindrical groove 32a, and a constricted portion 33c that connects the vane side surface portion 33a and the cylindrical portion 33b. The cylindrical portion 33b is formed at the end of the vane 33.

[0109] By engaging the cylindrical portion 33b with the cylindrical groove 32a, the vane 33 operates without leaving the piston 32.

[0110] A notch portion 33d extending from one end face to the other end face is formed on the cylindrical portion 33b. The cylindrical portion 33b divides the arc surface 33e of the cylindrical portion 33b into a plurality of parts through the notch portion 33d. Thus, arc surfaces 33e that are at least separated into two parts are formed on the outer peripheral surface of the cylindrical portion 33b through the notch portion 33d.

[0111] Each arc surface 33e is set to an arc angle β greater than 90° and less than 180°, and the notch portion 33d is set to an arc angle γ less than 45°. Additionally, the arc angle β is preferably 110° or more and 150° or less.

[0112] By setting the notch portion 33d to an arc angle γ less than 45°, the contact area between the cylindrical groove 32a and the cylindrical portion 33b can be increased, and refrigerant leakage can be reliably prevented.

[0113] In this embodiment, the notch portion 33d is formed at the blade tip of the blade 33. That is, the notch portion 33d is formed at the front end of the cylindrical portion 33b. It is not easy to apply a load to the blade tip. By forming the notch portion 33d at the blade tip, the suction-side arc surface 33e1 and the discharge-side arc surface 33e2 can be symmetrically formed through the notch portion 33d. In addition, in this embodiment, the notch portion 33d is formed as a flat surface, but as long as the notch portion 33d is cut in a manner that makes it an inner side surface compared to the arc-shaped outer peripheral surface of the cylindrical portion 33b, it may also be formed as a curved surface, or may be formed by a single flat surface.

[0114] Preferably, the two formed arc surfaces 33e are arranged at the position closest to the extended imaginary plane X on the side surface of the blade side surface portion 33a. In this way, since the point on the side surface of the blade side surface portion 33a in the cylindrical portion 33b closest to the extended imaginary plane X is located on the arc surface 33e, refrigerant leakage can be reliably prevented.

[0115] The Vickers hardness of the surface of the piston 32 is set to Hv400 or less. Since the piston 32 itself uses a low-hardness member, the cylindrical groove 32a is easily formed. Since the surface formed by the cylindrical portion 33b and the cylindrical groove 32a is in contact, the wear resistance is also high.

[0116] The Vickers hardness of the surface of the piston 32 is preferably set in the range of Hv80 to Hv400, and more preferably set in the range of Hv180 to Hv250.

[0117] The piston 32 preferably uses a gray cast iron material. Since the gray cast iron material is used, the cylindrical groove 32a is easily formed. In addition, the piston 32 can be formed of a sintered material. When the piston 32 uses a sintered material, the Vickers hardness is preferably set to Hv400 or less.

[0118] The surface of the blade side surface portion 33a, that is, the side surface of the blade 33, is surface-treated, and the side surface of the blade 33 is set to a hardness with a Vickers hardness exceeding Hv1000. Therefore, sufficient sliding resistance can be achieved with respect to the blade groove 36.

[0119] Nitriding treatment or DLC treatment is suitable for the surface treatment of the blade side surface portion 33a. By performing nitriding treatment or DLC treatment, a hard coating treatment can be performed on the blade side surface portion 33a.

[0120] The surface hardness of at least a part of the cylindrical portion 33b is lower than that of the blade side surface portion 33a. In addition, at least a part of the cylindrical portion 33b refers to the arc surface 33e. The same applies in the following description. Thus, by making the surface hardness of at least a part of the cylindrical portion 33b lower than that of the blade side surface portion 33a, sliding resistance with respect to the blade groove 36 is achieved, and by making the surface hardness of at least a part of the cylindrical portion 33b lower than that of the blade side surface portion 33a, the workability and toughness of the cylindrical portion 33b can be improved.

[0121] The Vickers hardness of at least a part of the cylindrical portion 33b is preferably lower than the Vickers hardness of the blade side surface portion 33a by Hv200 or more. That is, by performing a hard coating treatment on the blade side surface portion 33a so that the Vickers hardness of the blade side surface portion 33a is higher than the Vickers hardness of at least a part of the cylindrical portion 33b by Hv200 or more, sufficient sliding resistance with respect to the blade groove 36 can be achieved.

[0122] In addition, the surface hardness of the constricted portion 33c is lower than that of the blade side surface portion 33a. Thus, by making the surface hardness of the constricted portion 33c lower than that of the blade side surface portion 33a, the workability and toughness of the constricted portion 33c can be improved, and by making the surface hardness of the blade side surface portion 33a higher than that of the constricted portion 33c, sliding resistance with respect to the blade groove 36 can be achieved.

[0123] Furthermore, the surface hardness of the constricted portion 33c is preferably lower than the surface hardness of the cylindrical portion 33b. By making the surface hardness of the constricted portion 33c lower than the surface hardness of the blade side surface portion 33a or the cylindrical portion 33b, the workability and toughness of the constricted portion 33c can be improved. In addition, the surface hardness of the arc surface 33e is preferably lower than the surface hardness of the notch portion 33d. By making the surface hardness of the arc surface 33e lower than the surface hardness of the notch portion 33d, the workability and toughness of the arc surface 33e can be improved.

[0124] Figure 4 It is a diagram showing the manufacturing process of the blade for a rotary compressor of the same embodiment.

[0125] Figure 4 (a) shows the base material of the blade 33. The blade 33 uses an iron alloy mainly composed of iron (Fe) and containing chromium (Cr), or a steel material obtained by adding metal materials such as chromium (Cr), tungsten (W), vanadium (V), and molybdenum (Mo) to high-carbon steel. In addition, since the blade 33 uses a steel material without adding tungsten (W) and vanadium (V), cost reduction can be achieved. In addition, the blade 33 can use stainless steel (for example, SUS440C).

[0126] Figure 4 (b) shows Figure 4The state where the base material of the blade 33 shown in (a) is subjected to hard film coating treatment.

[0127] As Figure 4 As shown in (c), the base material of the blade 33 that has been subjected to hard film coating treatment is fixed to the fixture Y, and the cylindrical portion 33b and the constricted portion 33c are machined by the cutting tool Z.

[0128] As Figure 4 As shown in (c), in order to form the cylindrical portion 33b with an arc angle α exceeding 180°, it is necessary to perform finish machining in two or more times, and the machining accuracy at the connecting surface M of the machining surfaces is reduced.

[0129] However, by dividing the arc surface 33e of the cylindrical portion 33b into a plurality of parts through the notch portion 33d, and setting each arc surface 33e to an arc angle β less than 180°, the machining accuracy of the arc surface 33e of the cylindrical portion 33b can be improved.

[0130] In particular, by forming the notch portion 33d at the connecting surface M, that is, the front end of the cylindrical portion 33b, it is possible to perform machining only through two finish machinings, namely, the finish machining of the suction-side arc surface 33e1 and the finish machining of the discharge-side arc surface 33e2.

[0131] The working fluid and the refrigeration oil described as the refrigerant in this embodiment are in a two-phase separation state at a temperature of 25°C. Thus, in particular, even when it is not possible to avoid liquid compression operation by using a refrigeration oil with low compatibility with the working fluid in the low rotation region of the rotary compressor 1, lubricating performance can be ensured, and a good sliding state can be maintained. Here, the low rotation region refers to a rotation speed region of 900 rpm or less, particularly 600 rpm or less, and further 360 rpm or less. In the low rotation region, liquid compression is likely to occur. By ensuring the lubricating performance in the low rotation region where liquid compression is likely to occur, stable operation in the low rotation region, that is, low-capacity operation, can be achieved.

[0132] In addition, in the mixture in which the working fluid is maximally dissolved in the refrigeration oil under the temperature condition of 0°C to 25°C, the proportion of the working fluid is 1 wt% or more and less than 30 wt%. Thus, in particular, even when it is not possible to avoid liquid compression operation by using a refrigeration oil with low compatibility with the working fluid in the low rotation region, lubricating performance can be ensured, and a good sliding state can be maintained.

[0133] In this embodiment, it has been described that the accumulator 14 is included upstream of the suction pipe 12, but the accumulator 14 can be omitted. That is, even when it is impossible to avoid liquid compression operation by using a refrigerating oil with low compatibility with the working fluid, the lubricating performance of the refrigerating oil can be ensured and a good sliding state can be maintained. Therefore, the accumulator 14 may not be provided either.

[0134] In addition, the volume of the liquid storage part 14f of the accumulator 14 can be set to be 2 times or less of the suction volume formed in the cylinder 31. That is, even when it is impossible to avoid liquid compression operation by using a refrigerating oil with low compatibility with the working fluid, the lubricating performance can be ensured and a good sliding state can be maintained. Therefore, the accumulator 14 can be made smaller.

[0135] In addition, in this embodiment, the compression mechanism part 30 composed of one cylinder 31 and one piston 32 has been described, but the compression mechanism part 30 composed of two cylinders 31 and two pistons 32 may also be used. Considering that such a rotary compressor with two pistons is suitable for low-speed operation, it is also preferable that each vane 33 operates without leaving each piston 32.

[0136] In addition, as a device using the rotary compressor 1 suitable for low-speed operation, for example, it is also particularly applicable to a room air conditioner (household air conditioner) in an air conditioning device.

[0137] As described in this embodiment, according to the compression mechanism part 30 in which the vane 33 operates without leaving the piston 32, an efficient rotary compressor can be realized.

[0138] In particular, by setting the working fluid as R32 and the refrigerating oil as alkylbenzene oil, the compatibility is low, the lubricating performance can be ensured, and a good sliding state can be maintained. In addition, the same applies to the working fluid containing at least R32.

[0139] In addition, by setting the working fluid as carbon dioxide and the refrigerating oil as polyalkylene glycol oil, the compatibility is low, the lubricating performance can be ensured, and a good sliding state can be maintained. In addition, the same applies to the working fluid containing at least carbon dioxide.

[0140] In addition, by setting the working fluid as R290 and the refrigerating oil as polyalkylene glycol oil, the compatibility is low, the lubricating performance can be ensured, and a good sliding state can be maintained. In addition, the same applies to the working fluid containing at least R290.

[0141] In addition, the kinematic viscosity of the refrigerating oil is preferably 35 mm / s or less. For example, when the working fluid contains carbon dioxide or R290, a refrigerating oil with a kinematic viscosity exceeding 35 mm / s may also be used.

[0142] In addition, a rotary compressor in which the vane 33 operates without leaving the piston 32 can use R1234yf or HFO1123, a working fluid containing R1234yf, or a working fluid containing HFO1123. From the viewpoint of lubricating performance, in R1234yf or a working fluid containing R1234yf, it is preferable to use alkylbenzene oil as the refrigeration oil, and in HFO1123 or a working fluid containing HFO1123, it is preferable to use ester oil or essential oil as the refrigeration oil.

[0143] The reliability of the device of this embodiment, in which the rotary compressor 1, the condenser 2, the decompression device 3, and the evaporator 4 are connected in a loop by piping, is high.

[0144] Industrial availability

[0145] The device of the present invention using a rotary compressor is useful as a refrigeration cycle device such as a hot water heating device, an air conditioning device, a water heater, a cold storage, a display case, a cooler, a dehumidifier, or a refrigerator.

Claims

1. A rotary compressor, characterized in that: A motor part and a compression mechanism part are arranged in a sealed container, The motor part and the compression mechanism part are connected by a shaft, The compression mechanism part has a cylinder, a piston disposed in the cylinder, and a vane that divides the inside of the cylinder, The shaft has an eccentric part, A groove for arranging the vane is formed on the cylinder, The eccentric part is disposed in the cylinder, The piston is fitted with the eccentric part, A cylindrical groove with an arc angle exceeding 180° is formed on the piston, A cylindrical part arranged in the cylindrical groove is formed at the end of the vane, The vane operates without leaving the piston, where A notch part is formed on the cylindrical part from one end surface to the other end surface of the cylindrical part, The arc surface of the cylindrical part is divided into a plurality of parts through the notch part, Each of the arc surfaces is made into an arc angle less than 180°, The notch part is made into an arc angle less than 45°.

2. The rotary compressor according to claim 1, characterized in that: The notch part is formed at the front end of the vane of the vane.

3. The rotary compressor according to claim 1 or 2, characterized in that: At least two separated arc surfaces are formed on the outer peripheral surface of the cylindrical part, The two formed arc surfaces are arranged at the position closest to the imaginary extended surface X of the side surface of the vane.

4. A device, characterized in that: The rotary compressor according to claim 1 or 2 is used, The rotary compressor, a condenser, a decompression device, and an evaporator are connected in a ring shape through pipes.

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