JP6251632B2 - Hermetic compressor and refrigeration cycle apparatus - Google Patents

Description

  Embodiments described herein relate generally to a hermetic compressor and a refrigeration cycle apparatus.

  In recent years, in a refrigeration cycle apparatus including a hermetic compressor, an HFC (hydrofluorocarbon) refrigerant such as R410A is used as the refrigerant. Unlike the conventionally used HCFC (hydrochlorofluorocarbon) refrigerant, this HFC refrigerant has an ODP (ozone depletion coefficient) of zero and is excellent in that it does not destroy the ozone layer. However, this HFC refrigerant has a problem that GWP (Global Warming Potential) is high. Therefore, HFO (hydrofluoroolefin) refrigerant has attracted attention as a refrigerant having zero ODP and low GWP.

  As a refrigeration cycle apparatus using an HFO refrigerant, for example, one described in Patent Document 1 below is known.

JP 2011-1897 A

  However, there is a problem that the HFO refrigerant becomes unstable and decomposes at a high temperature, and when the portion that slides to compress the HFO refrigerant in the hermetic compressor becomes high temperature, the heat accelerates the decomposition of the HFO refrigerant. In some cases, hydrogen fluoride is generated. When hydrogen fluoride is generated, the inside of the hermetic compressor is corroded or sludge is generated by the hydrogen fluoride.

  In order to prevent the HFO refrigerant from being decomposed and generating hydrogen fluoride, it is necessary to reliably supply the lubricating oil to the sliding portion in the hermetic compressor and suppress the temperature rise of the sliding portion. It is.

  Patent Document 1 does not describe that the lubricant oil is reliably supplied to the sliding portion in the hermetic compressor and the temperature rise of the sliding portion is suppressed.

  An object of an embodiment of the present invention is to use a refrigerant containing an HFO refrigerant as a refrigerant and to refrigerating machine oil to the sliding part when the sliding part in the hermetic compressor is lubricated with refrigerating machine oil compatible with the refrigerant. It is providing the hermetic compressor which can perform supply of this reliably, and the refrigerating-cycle apparatus containing this hermetic compressor.

In the hermetic compressor according to the embodiment, an electric motor unit and a compression mechanism unit driven by a rotating shaft connected to the electric motor unit are accommodated in a hermetic case, and the compression mechanism unit includes a cylinder that forms a cylinder chamber, A roller fitted in the eccentric portion of the rotating shaft and eccentrically rotating in the cylinder chamber, and a suction chamber in the cylinder chamber by being reciprocated by being pressed in a direction in which the tip portion is brought into contact with the outer peripheral surface of the roller. And a blade partitioned into a compression chamber, and after surface finishing is performed on a portion where the roller and the blade are in contact with each other, surface hardening treatment is performed on at least one of the portions where the blade and the roller are in contact with each other. And a refrigerant containing a hydrofluoroolefin refrigerant having a carbon double bond is used as the refrigerant and the refrigerating machine oil compatible with the refrigerant is used in the sealed case. In stowed hermetic compressor, the refrigerating machine oil is hindered type of polyol ester oil, an antioxidant and an acid scavenger and a metal deactivator additive is added, extreme pressure agent It is not added, and the direction of the processing mark by the surface finishing processing of the contact surface between the roller and the blade is different.

It is a block diagram of the refrigerating-cycle apparatus containing the hermetic type compressor shown in the cross section in 1st Embodiment. It is a perspective view which shows the structure of a cylinder, a roller, and a braid | blade. It is a perspective view which shows the direction of the surface finishing process of a roller and a braid | blade. It is a graph which shows the relationship between the synthetic | combination surface roughness of a roller and a blade, and the abrasion loss of a roller blade. It is a perspective view which shows the direction of the surface finishing process of a roller and a braid | blade in 2nd Embodiment. It is a perspective view which shows the direction of the surface finishing process of a roller and a braid | blade in 3rd Embodiment. It is a perspective view which shows the direction of the surface finishing process of a roller and a braid | blade in 4th Embodiment.

(First embodiment)
A first embodiment will be described with reference to FIGS. FIG. 1 shows the overall configuration of a refrigeration cycle apparatus 1. The refrigeration cycle apparatus 1 has a compressor body 2 and an accumulator 3, and includes a hermetic compressor 4 that compresses a gas refrigerant, and a compressor body 2. A condenser 5 that condenses the high-pressure gas refrigerant discharged from the compressor body 2 to be a liquid refrigerant, an expansion device 6 that is connected to the condenser 5 to decompress the liquid refrigerant, and an expansion device 6. An evaporator 7 is connected between the accumulator 3 and evaporates the liquid refrigerant. The accumulator 3 and the compressor body 2 are connected by a suction pipe 8 through which a low-pressure gas refrigerant flows. In the accumulator 3, the gas refrigerant and the liquid refrigerant are separated, and only the gas refrigerant is supplied to the compressor body 2.

  In this refrigeration cycle apparatus 1, as a refrigerant, a refrigerant containing an HFO (hydrofluoroolefin) refrigerant having a carbon double bond (for example, a single refrigerant such as an HFO-1234yf refrigerant or an HFO-1234ze refrigerant, or these HFOs) -1234yf refrigerant or a mixed refrigerant of HFO-1234ze refrigerant and HFC32 refrigerant).

  The compressor body 2 has a sealed case 9 formed in a cylindrical shape, and an electric motor unit 10 located on the upper side and a compression mechanism unit 11 located on the lower side are accommodated in the sealed case 9. Yes. The electric motor unit 10 and the compression mechanism unit 11 are connected via a rotating shaft 12 having a vertical center line and rotating around the center line. The rotary shaft 12 is pivotally supported by a main bearing 13 and a sub bearing 14 disposed on both sides of the compression mechanism portion 11.

  Refrigerating machine oil 15 is stored at the bottom of the sealed case 9, and the compression mechanism 11 is lubricated by the refrigerating machine oil 15. As the refrigerating machine oil 15, an oil having compatibility with the HFO refrigerant, for example, a single oil such as a hindered type polyol ester oil, a polyether oil, a PAG oil, or a mixed oil thereof is used. In particular, hindered type polyol ester oil is preferred. The refrigerating machine oil 15 includes, as additives, an antioxidant that prevents the refrigerating machine oil 15 from being oxidized, an acid scavenger that captures the acid in the refrigerating machine oil 15 and the acid generated in the refrigeration cycle apparatus, and an anti-metal. A metal deactivator that promotes activation is added. On the other hand, no extreme pressure additive such as ICP (tricresyl phosphate) or TPP (triphenyl phosphate) is added to the refrigerating machine oil 15.

  The electric motor unit 10 is a portion that drives the compression mechanism unit 11. The electric motor unit 10 includes a rotor 16 that is fixed to the rotary shaft 12 and a stator 17 that is fixed to the sealing case 9 and disposed at a position surrounding the rotor 16. Have. The electric motor unit 10 may be a brushless DC synchronous motor driven by an inverter, an AC motor, or a motor driven by a commercial power source.

  The compression mechanism part 11 is a part which compresses a gas refrigerant, and has two compression elements, the 1st compression element 19a and the 2nd compression element 19b which are located up and down via the partition plate 18. As shown in FIG.

  The first compression element 19 a located on the upper side has a first cylinder 20 a, the lower end side of the first cylinder 20 a is closed by the partition plate 18, and the upper end side of the first cylinder 20 a is closed by the main bearing 13. In the first cylinder 20a, a first cylinder chamber 21a in which the upper and lower ends of the first cylinder 20a are closed by the main bearing 13 and the partition plate 18 is formed. The first cylinder chamber 21a and a second cylinder chamber, which will be described later, pass through the rotary shaft 12, and a first eccentric portion 22a is formed in a portion of the rotary shaft 12 located in the first cylinder chamber 21a. The first roller 23a is fitted to the portion 22a. The 1st roller 23a is arrange | positioned so that it may eccentrically rotate, making the outer peripheral surface line-contact with the internal peripheral surface of the 1st cylinder 20a through an oil film at the time of rotation of the rotating shaft 12. FIG. Further, in the first cylinder 20a, a suction chamber, which will be described later, is housed in a blade groove, which will be described later, so as to be able to reciprocate and the front end portion is brought into contact with the outer peripheral surface of the first roller 23a. A first blade 24a is provided for partitioning into a compression chamber and a compression chamber. A first spring 25a is provided on the rear end side of the first blade 24a so as to press the first blade 24a in a direction in which the tip end of the first blade 24a comes into contact with the outer peripheral surface of the first roller 23a. The first compression element 19a includes the first cylinder 20a, the first eccentric portion 22a, the first roller 23a, the first blade 24a, the first spring 25a, and the like.

  The second compression element 19b located on the lower side has the same configuration as the first compression element 19a described above, and has a second cylinder 20b. The upper end side of the second cylinder 20b is closed by the partition plate 18, and the second The lower end side of the cylinder 20 b is closed by the auxiliary bearing 14. In the second cylinder 20b, a second cylinder chamber 21b is formed in which the upper and lower ends of the second cylinder 20b are closed by the partition plate 18 and the auxiliary bearing 14b. The rotating shaft 12 is penetrated through the second cylinder chamber 21b. A second eccentric portion 22b is formed in a portion of the rotating shaft 12 located in the second cylinder chamber 21b, and a second roller is formed in the second eccentric portion 22b. 23b is fitted. The second roller 23b is arranged to rotate eccentrically while the outer peripheral surface of the second roller 23b is in line contact with the inner peripheral surface of the second cylinder 20b via an oil film when the rotary shaft 12 rotates. Further, in the second cylinder 20b, a suction chamber, which will be described later, is housed in a blade groove, which will be described later, so as to be able to reciprocate, and the tip portion is brought into contact with the outer peripheral surface of the second roller 23b. A second blade 24b is provided for partitioning into a compression chamber. On the rear end side of the second blade 24b, a second spring 25b is provided that presses the second blade 24b in a direction in which the tip end of the second blade 24b contacts the outer peripheral surface of the second roller 23b. The second compression element 19b includes the second cylinder 20b, the second eccentric portion 22b, the second roller 23b, the second blade 24b, the second spring 25b, and the like.

  The main bearing 13 is formed with a first discharge hole 26a through which the gas refrigerant compressed in the first cylinder chamber 21a of the first compression element 19a is discharged from the first cylinder chamber 21a. A second discharge hole 26b is formed through which the gas refrigerant compressed in the second cylinder chamber 21b of the second compression element 19b is discharged from the second cylinder chamber 21b. The main bearing 13 is provided with a first discharge valve device 27a for opening and closing the first discharge hole 26a, and the auxiliary bearing 14b is provided with a second discharge valve device 27b for opening and closing the second discharge hole 26b. Yes. Further, a first muffler 28a into which the gas refrigerant discharged from the first discharge hole 26a flows is attached to the main bearing 13a at a position surrounding the first discharge valve device 27a, and the sub-bearing 14 has a second discharge hole. A second muffler 28b into which the gas refrigerant discharged from 26b flows is attached at a position surrounding the second discharge valve device 27b. In the first muffler 28a and the second muffler 28b, a communication path (not shown) formed through the auxiliary bearing 14, the second cylinder 20b, the partition plate 18, the first cylinder 20a, and the main bearing 13 is formed. It is communicated by. The first muffler 28 a has an outflow hole 29 through which the gas refrigerant in the first muffler 28 a flows out into the sealed case 9.

  The first discharge valve device 27a is fixed to the main bearing 13 and opens and closes the first discharge hole 26a. The first reed valve device 27a is fixed to the main bearing 13 and restricts the maximum opening of the first reed valve 30a. 1 valve presser 31a.

  The second discharge valve device 27b is a second reed valve 30b that is fixed to the sub-bearing 14 to open and close the second discharge hole 26b, and a second reed valve 30b that is fixed to the sub-bearing 14 and regulates the maximum opening of the second reed valve 30b. 2 valve presser 31b.

  FIG. 2 is a perspective view showing the configuration of the first cylinder 20a, the first roller 23a, and the first blade 24a in the first compression element 19a. Note that the configuration of the second cylinder 20b, the second roller 23b, and the second blade 24b in the second compression element 19b is the same as the configuration shown in FIG.

  The first blade 24a is accommodated in a blade groove 32 formed in the first cylinder 20a so as to be reciprocally movable. The tip of the first blade 24a is in contact with the outer peripheral surface of the first roller 23a, and the tip of the first blade 24a is in contact with the outer peripheral surface of the first roller 23a. The inside is partitioned into a suction chamber 33 and a compression chamber 34.

  FIG. 3 is a perspective view showing the direction of surface finishing performed on the first roller 23a and the first blade 24a in the first compression element 19a. Note that the same surface finishing is performed on the second roller 23b and the second blade 24b in the second compression element 19b, and the direction is the same as that shown in FIG. Omitted.

  The surface finishing process of the first roller 23a is performed by grinding the entire outer peripheral surface of the first roller 23a. This surface finishing is performed by holding the grinding tool in a fixed position and rotating the first roller 23a around the center line while contacting the grinding tool. By this surface finishing, a ring-shaped processing mark 35 is formed on the outer peripheral surface of the first roller 23a along the circumferential direction of the first roller 23a. The processing marks 35 are formed so as to form a striped pattern in which concave portions and convex portions are alternately arranged.

  The surface finishing of the first blade 24a is performed by grinding on the tip of the first blade 24a and the portion that is in contact with the outer peripheral surface of the first roller 23a. In this surface finishing process, the first blade 24a is held in a fixed position, the grinding tool is brought into contact with the surface of the first blade 24a, and the grinding tool is moved in the longitudinal direction (vertical direction in FIG. 3). ) Is moved along. By this surface finishing process, a linear processing mark 36 is formed on the surface of the tip portion of the first blade 24a along the longitudinal direction of the tip portion. This processing mark 36 has a striped pattern in which concave portions and convex portions are alternately arranged, and when the first blade 24a is brought into contact with the outer peripheral surface of the first roller 23a, the processing mark 35 of the first roller 23a. It is formed in the direction orthogonal to. That is, the direction of the processing marks 35 and 36 by the surface finishing of the contact surface between the first roller 23a and the first blade 24a is different.

  Further, the above-described surface finishing process is performed on the entire outer peripheral surface of the first roller 23a and at least one of the front end portion of the first blade 24a and the portion in contact with the outer peripheral surface of the first roller 23a. After that, DLC (diamond-like carbon) coating is performed as a surface hardening treatment. In addition, as this surface hardening process, it may replace with DLC coating and may perform CrN (chromium nitride) coating only to the 1st braid | blade 24a.

The combined surface roughness of the 10-point average roughness of the contact portion between the first roller 23a and the first blade 24a after the surface hardening process is set to “0.6 to 3 μm”. This combined surface roughness is measured by measuring the ten-point average roughness “R _R ” of the outer peripheral surface of the first roller 23 a and the ten-point average roughness “R _B ” of the tip of the first blade 24 a (R _R ² ) ² and (R _B ) ² can be obtained as the square root after addition.

  FIG. 4 shows the composite surface roughness of the ten point average roughness of the contact portion between the first roller 23a and the first blade 24a, the first roller 23a, It is a graph which shows the relationship with the abrasion loss of 1 braid | blade 24a. As shown in this graph, the wear amount is minimized when the synthetic surface roughness is 0.6 μm, the wear amount gradually increases as the synthetic surface roughness increases, and the wear amount when the synthetic surface roughness exceeds 3 μm. It can be seen that the abrupt increase increases and abnormal wear occurs. It can also be seen that the amount of wear increases when the synthetic surface roughness is less than 0.6 μm.

  In such a configuration, in the hermetic compressor 4, when the electric motor unit 10 is energized, the rotating shaft 12 rotates around the center line, and the rotation of the rotating shaft 12 drives the compression mechanism unit 11. -Gas refrigerant is compressed in the 2nd compression elements 19a and 19b.

  When the pressure of the compressed gas refrigerant reaches the set pressure, the first and second reed valves 30a and 30b are opened, and the compressed gas refrigerant is discharged from the first and second discharge holes 26a and 26b. The gas refrigerant discharged from the first discharge hole 26a flows into the first muffler 28a, and the gas refrigerant discharged from the second discharge hole 26b flows into the second muffler 28b and then passes through the communication path to the first. It flows into the muffler 28 a and flows out from the outflow hole 29 into the sealed case 9.

  The gas refrigerant that has flowed into the sealed case 9 flows in the order of the condenser 5, the expansion device 6, and the evaporator 7, returns to the sealed compressor 4, and the refrigeration cycle in the refrigeration cycle apparatus 1 is executed.

  Here, in the refrigeration cycle apparatus 1 including the hermetic compressor 4, a refrigerant including an HFO refrigerant is used as the refrigerant. HFO refrigerants have excellent properties such as zero ODP (ozone depletion coefficient) and low GWP (global warming potential), but they are easily decomposed at high temperatures to generate hydrogen fluoride. It has the nature of Therefore, it is necessary to satisfactorily supply the refrigerating machine oil 15 to the contact portion between the first roller 23a and the first blade 24a and suppress the temperature rise at the contact portion.

  Further, the entire surface of the outer peripheral surface of the first roller 23a and at least one of the tip portion of the first blade 24a that is in contact with the outer peripheral surface of the first roller 23a are subjected to surface hardening to suppress wear. DLC coating is performed as a process. And since the refrigerator oil 15 becomes difficult to adsorb | suck in the part in which such a surface hardening process was performed, it can suppress a temperature rise with the refrigerator oil 15 in the contact part of the 1st roller 23a and the 1st braid | blade 24a. It becomes difficult.

  Therefore, in the hermetic compressor 4, when the surface finishing process is performed on the first roller 23a and the first blade 24a before the surface hardening process, the surface finishing processes are performed in different directions. . Specifically, a ring-shaped processing mark 35 in which concave portions and convex portions are alternately arranged is formed over the entire outer peripheral surface of the first roller 23a by surface finishing, and is the tip portion of the first blade 24a. A linear processing mark 36 in which concave portions and convex portions are alternately arranged is formed in a portion that is in contact with the outer peripheral surface of the first roller 23a, and the directions of these processing marks 35 and 36 are orthogonal to each other. ing.

  As described above, the processing marks 35 and 36 having different directions are formed on the contact surface between the first roller 23a and the first blade 24a by the surface finishing process, so that the contact between the first roller 23a and the first blade 24a. The refrigerating machine oil 15 is likely to stay in the portion, and the staying refrigerating machine oil 15 can suppress the temperature rise at the contact portion between the first roller 23a and the first blade 24a. Thereby, even when a refrigerant containing an HFO refrigerant is used as the refrigerant, it is possible to prevent the HFO refrigerant from being decomposed by heat and generating hydrogen fluoride.

  Further, the combined surface roughness of the ten-point average roughness of the contact portion between the first roller 23a and the first blade 24a after the surface hardening process is set to “0.6 to 3 μm”. The smaller the synthetic surface roughness, the smaller the wear amount of the first roller 23a and the first blade 24a. If the wear amount is "3 μm" or less, abnormal wear does not occur. On the other hand, when the synthetic surface roughness is smaller than “0.6 μm”, the clearance between the first roller 23a and the first blade 24a becomes small, and it becomes impossible to secure a space in which the refrigerating machine oil 15 is accumulated, resulting in an amount of wear. Increase.

  In the refrigerating machine oil 15, an antioxidant, an acid scavenger, and a metal deactivator are added as additives, but in the present invention, wear is suppressed as shown in the graph of FIG. It is not necessary to add an extreme pressure additive having an anti-wear function. And generation | occurrence | production of sludge can be suppressed by not adding an extreme pressure additive.

(Second Embodiment)
A second embodiment will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the same component as the component demonstrated in 1st Embodiment, and the overlapping description is abbreviate | omitted (same also in the following embodiment).

  FIG. 5 is a perspective view illustrating the direction of the surface finishing process performed on the first roller 23a and the first blade 24a in the refrigeration cycle apparatus 1 of the second embodiment. The same surface finishing is performed on the second roller 23b and the second blade 24b, and the direction thereof is the same as that shown in FIG.

  The surface finishing process of the first roller 23a is performed by grinding the entire outer peripheral surface of the first roller 23a. The surface finishing process is performed by rotating the first roller 23a around the center line while contacting the grinding tool and reciprocating the grinding tool in the direction of the center line of the first roller 23a. By this surface finishing process, a processing mark 35a is formed on the outer peripheral surface of the first roller 23a so as to obliquely intersect the circumferential direction of the first roller 23a. The processing mark 35a is formed in a mesh shape in which two striped patterns in which concave portions and convex portions are alternately arranged intersect each other.

  The surface finishing of the first blade 24a is performed by grinding on the tip of the first blade 24a and the portion that is in contact with the outer peripheral surface of the first roller 23a. In this surface finishing process, the first blade 24a is held in a fixed position, the grinding tool is brought into contact with the surface of the first blade 24a, and the grinding tool is moved in a direction perpendicular to the longitudinal direction of the tip of the first blade 24a. Is done by letting By this surface finishing process, an arc-shaped processing mark 36a is formed on the surface of the tip portion of the first blade 24a in a direction orthogonal to the longitudinal direction of the tip portion. This processing mark 36a has a striped pattern in which concave portions and convex portions are alternately arranged, and when the first blade 24a is brought into contact with the outer peripheral surface of the first roller 23a, the processing mark 35a of the first roller 23a It is formed in a direction that crosses diagonally. That is, the direction of the processing marks 35a and 36a by the surface finishing of the contact surface between the first roller 23a and the first blade 24a is different.

  Further, the above-described surface finishing process is performed on the entire outer peripheral surface of the first roller 23a and at least one of the front end portion of the first blade 24a and the portion in contact with the outer peripheral surface of the first roller 23a. After that, DLC coating is performed as a surface hardening treatment.

  In such a configuration, the processing marks 35a and 36a having different directions are formed by surface finishing at the contact portion between the first roller 23a and the first blade 24a, so that the first roller 23a and the first blade 24a The refrigerating machine oil 15 is likely to stay in the contact portion of the first, and the staying refrigerating machine oil 15 can suppress an increase in the temperature of the contact portion between the first roller 23a and the first blade 24a. Thereby, even when a refrigerant containing an HFO refrigerant is used as the refrigerant, it is possible to prevent the HFO refrigerant from being decomposed by heat and generating hydrogen fluoride.

(Third embodiment)
A third embodiment will be described with reference to FIG. FIG. 6 is a perspective view showing the direction of surface finishing performed on the first roller 23a and the first blade 24a in the refrigeration cycle apparatus 1 of the third embodiment. Note that the same surface finishing process is performed on the second roller 23b and the second blade 24b, and the direction thereof is the same as that shown in FIG.

  The surface finishing process of the first roller 23a is performed by grinding the entire outer peripheral surface of the first roller 23a. This surface finishing is performed by holding the grinding tool in a fixed position and rotating the first roller 23a around the center line while contacting the grinding tool. By this surface finishing, a ring-shaped processing mark 35 is formed on the outer peripheral surface of the first roller 23a along the circumferential direction of the first roller 23a. The processing marks 35 are formed so as to form a striped pattern in which concave portions and convex portions are alternately arranged.

  The surface finishing of the first blade 24a is performed by grinding on the tip of the first blade 24a and the portion that is in contact with the outer peripheral surface of the first roller 23a. In this surface finishing process, the first blade 24a is held in a fixed position, the grinding tool is brought into contact with the surface of the first blade 24a, and the grinding tool is obliquely intersected with the longitudinal direction of the tip portion of the first blade 24a. It is done by moving to. By this surface finishing process, a processing mark 35b is formed on the surface of the tip portion of the first blade 24a so as to obliquely intersect the longitudinal direction of the tip portion of the first blade 24a. The processing mark 35b is formed in a mesh shape in which two striped patterns in which concave portions and convex portions are alternately arranged intersect each other. That is, the direction of the processing marks 35 and 36b by the surface finishing of the contact surface between the first roller 23a and the first blade 24a is different.

  Further, the above-described surface finishing process is performed on the entire outer peripheral surface of the first roller 23a and at least one of the front end portion of the first blade 24a and the portion in contact with the outer peripheral surface of the first roller 23a. After that, DLC coating is performed as a surface hardening treatment.

  In such a configuration, the processing marks 35 and 36b having different orientations are formed by surface finishing at the portion where the first roller 23a and the first blade 24a abut, thereby the first roller 23a and the first blade 24a. The refrigerating machine oil 15 is likely to stay in the contact portion of the first, and the staying refrigerating machine oil 15 can suppress an increase in the temperature of the contact portion between the first roller 23a and the first blade 24a. Thereby, even when a refrigerant containing an HFO refrigerant is used as the refrigerant, it is possible to prevent the HFO refrigerant from being decomposed by heat and generating hydrogen fluoride.

(Fourth embodiment)
A fourth embodiment will be described with reference to FIG. FIG. 7 is a perspective view showing the direction of surface finishing performed on the first roller 23a and the first blade 24a in the refrigeration cycle apparatus 1 of the fourth embodiment. Note that the same surface finishing process is performed on the second roller 23b and the second blade 24b, and the direction thereof is the same as that shown in FIG.

  The surface finishing of the first roller 23a is performed by grinding the entire outer peripheral surface of the first roller 23a, and then forming a plurality of concave thimbles 37 as processing traces on the surface by shot blasting. It has been broken.

  The surface finishing of the first blade 24a is performed by grinding on the tip of the first blade 24a and the portion that is in contact with the outer peripheral surface of the first roller 23a. In this surface finishing process, the first blade 24a is held in a fixed position, the grinding tool is brought into contact with the surface of the first blade 24a, and the grinding tool is moved in a direction perpendicular to the longitudinal direction of the tip of the first blade 24a. Is done by letting By this surface finishing process, an arc-shaped processing mark 36a is formed on the surface of the tip portion of the first blade 24a in a direction orthogonal to the longitudinal direction of the tip portion. The processing mark 36a has a striped pattern in which concave portions and convex portions are alternately arranged. That is, the direction of the processing marks 37 and 36a by the surface finishing processing of the contact surface between the first roller 23a and the first blade 24a is different.

  In such a configuration, the first roller 23a and the first mark 23a are formed at the portion where the first roller 23a and the first blade 24a are in contact with each other by forming the timple 37 and the processing mark 36a having different surface finishing directions. The refrigerating machine oil 15 is likely to stay in the contact portion with the blade 24a, and the staying refrigerating machine oil 15 can suppress the temperature rise of the contact portion between the first roller 23a and the first blade 24a. Thereby, even when a refrigerant containing an HFO refrigerant is used as the refrigerant, it is possible to prevent the HFO refrigerant from being decomposed by heat and generating hydrogen fluoride.

  As mentioned above, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. This embodiment and its modifications are included in the scope of the present invention and the gist thereof, and are also included in the invention described in the claims and the equivalent scope thereof.

DESCRIPTION OF SYMBOLS 1 ... Refrigeration cycle apparatus, 4 ... Sealed compressor, 5 ... Condenser, 6 ... Expansion device, 7 ... Evaporator, 9 ... Sealed case, 10 ... Electric motor part, 11 ... Compression mechanism part, 12 ... Rotating shaft,
20a, 20b ... cylinder, 21a, 21b ... cylinder chamber, 22a, 22b ... eccentric part, 23a, 23b ... roller, 24a, 24b ... blade, 33 ... suction chamber, 34 ... compression chamber, 35, 35a, 36, 36a, 36b, 37 ... processing marks

Claims (4)

An electric motor part and a compression mechanism part driven by a rotary shaft connected to the electric motor part are accommodated in a sealed case, and the compression mechanism part fits into a cylinder forming a cylinder chamber and an eccentric part of the rotary shaft. A roller that is eccentrically rotated in the cylinder chamber, and a blade that is reciprocated by being pressed in a direction in which the tip end is in contact with the outer peripheral surface of the roller, thereby partitioning the cylinder chamber into a suction chamber and a compression chamber; And a surface hardening process is performed on at least one of the abutting portions of the blade and the roller after the surface finishing process is performed on the abutting portion of the roller and the blade, and a double layer of carbon is used as a refrigerant. A hermetic compressor in which a refrigerant containing a hydrofluoroolefin refrigerant having a bond is used and a refrigerating machine oil compatible with the refrigerant is accommodated in the hermetic case Oite,
The refrigerating machine oil is a hindered type polyol ester oil, and an antioxidant, an acid scavenger and a metal deactivator are added as additives, and an extreme pressure additive is not added,
The hermetic compressor according to claim 1, wherein the direction of the processing mark by the surface finishing process on the contact surface between the roller and the blade is different. A ring-shaped processing mark along the circumferential direction is formed on the outer peripheral surface of the roller, and the longitudinal direction of the tip portion is in a direction orthogonal to the processing mark on the outer peripheral surface of the roller at the tip end of the blade The hermetic compressor according to claim 1, wherein a linear processing mark is formed along the line . The hermetic compressor according to claim 1, wherein the surface hardening treatment is a DLC coating . The hermetic compressor according to any one of claims 1 to 3, a condenser connected to the hermetic compressor, an expansion device connected to the condenser, the expansion device and the hermetic type An refrigeration cycle apparatus comprising: an evaporator connected to the compressor.

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