JP2005147093A - 2-cylinder hermetic rotary compressor and refrigerating air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve problems of a conventional 2-cylinder hermetic rotary compressor, in which a cylinder is distorted and deformed caused by tightening of a bolt in assembly, welding and fixing to a sealed vessel, and welding of a suction pipe to cause increase in leakage loss and degradation in performance, or in which clearance between a rotor and a stator of an electric motor is changed, and electromagnetic noise might be increased. <P>SOLUTION: In this rotary compressor, the size in a radial direction of a first bearing is approximately the same as that of a second bearing. In assembly of both bearings with both cylinders of a compression element part, the first bearing is assembled with a first cylinder by tightening by bolts at a position in a radial direction of the first bearing with a predetermined distance from the tip, the second bearing is directly assembled with a second cylinder by tightening of bolts at a position spaced by a predetermined distance from the tip of the second bearing in a radial direction, and both of the cylinders are directly assembled by tightening by a bolt through an intermediate partition board. The bolt tightening the cylinders is disposed at a position closer to the inside in the radial direction from the tip of each bearing with a predetermined distance. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a two-cylinder hermetic rotary compressor used in a refrigerating and air-conditioning apparatus such as a room air conditioner, a packaged air conditioner, and a refrigerator, and to a refrigerating and air-conditioning apparatus using the two-cylinder hermetic compressor. is there.

  In the case of a two-cylinder sealed rotary compressor, the cylinder is fastened and fixed up and down via an intermediate partition plate, and further welded and fixed to the sealed container. In addition, independent suction pipes are inserted into the upper and lower cylinders and welded and fixed. Compared to a single cylinder hermetic rotary compressor, the number of parts is large, and there are many bolt fastening and welding fixing points, so that the cylinder inner diameter and end face distortion deformation due to bolt fastening and welding fixing at the time of assembly may increase. Are known.

  In addition, the compression element parts of the hermetic rotary compressor are assembled with an appropriate assembly gap between the parts that have been finished with extremely high precision. The fastening distortion and welding distortion during assembly are leakage loss and sliding loss. Cause degradation of performance. Therefore, in the two-cylinder hermetic rotary compressor, it is necessary to prevent distortion deformation due to bolt fastening or welding fixation when assembling the compression element portion in order to obtain a highly efficient compressor without performance degradation.

  As a conventional two-cylinder hermetic rotary compressor, Patent Document 1 describes that “the compression element 4 is fixed to the cylinders 6 and 7, the intermediate partition plate 5 sandwiched between these cylinders, and the cylinder. The bearings 12 and 13 that support the rotating shaft are provided, and these bearings, cylinders, intermediate partition plates, and the like are aligned and fixed by bolts 16, 17, and 18. The bearings 12 and 13 are formed. The cylinders 6 and 7 are fixed with bolts 16 and 17, and the cylinder and the intermediate partition plate 5 are fixed with bolts 18 across the cylinders outside the bearings "(see Patent Document 1). .

  Patent Document 2 states that “the bearing 15 is fixed to the inner wall of the sealed container 1, and the cylinders 9 and 10 are fixed to the bearing 15, and a gap G is formed between each cylinder 9, 10 and the inner wall of the sealed container 1. As a result, the sealed container 1 has a design with a sufficient internal volume, and the reliability is improved. The compact multi-cylinder rotary compression element 3 can improve the compression efficiency and the mechanical efficiency. (See Patent Document 2).

Patent Document 3 states that “the compression mechanism section 7 is composed of a first cylinder 15 and a second cylinder 17 through which the shaft 11 passes, and these first and second cylinders 15 and 17 are Each of the first and second cylinders 15 and 17 is formed to have substantially the same thickness by being partitioned by the partition plate 19 so as to be independent of each other and fixed to the inner wall surface of the sealed case 1. The first bearing member 20 and the second bearing member 21 are bolted together by a mounting bolt 61 penetrating the first bearing member 20 ”(see Patent Document 3).
JP-A-6-159277 (page 3, FIG. 1, FIG. 2) Japanese Patent Laid-Open No. 2001-50184 (page 3, page 4, FIG. 1) JP-A-11-132177 (2nd page, 3rd page, FIG. 1)

  In general, when the upper and lower cylinders are fastened and fixed via the intermediate partition plate, the cylinder is distorted and deformed depending on the shape accuracy of the cylinder end surface and the intermediate partition plate end surface. In particular, according to the multi-cylinder rotary compressor of Patent Document 1, The bearings 12 and 13 are fixed to the respective cylinders 6 and 7 by bolts 16 and 17. The cylinders 6 and 7 and the intermediate partition plate 5 are bolts 18 straddling the respective cylinders 6 and 7 outside the bearings 12 and 13. As shown in FIG. 4 showing the compression element part, the position of the fastening bolt 18 is provided outside the collar part (tip part) of the bearings 12 and 13, and the upper and lower cylinders are shown as indicated by broken lines. 6 and 7 are distorted so that the outside contracts by fastening and the inside expands (however, the numbers in FIG. 4 and this paragraph are based on Patent Document 1).

Further, according to the multi-cylinder rotary compressor of Patent Document 2 and the rotary compressor of Patent Document 3, the upper and lower cylinders are fastened and tightened with bolts through the upper and lower bearings via the intermediate partition plate. Compared with the case where the upper and lower cylinders are directly fastened, the upper and lower cylinders are more affected by the shape accuracy of the upper and lower bearings, and the fastening strain of the upper and lower cylinders becomes larger.
Furthermore, according to the rotary compressor of Patent Document 3, the upper and lower cylinders are fixed to the inner wall surface of the hermetic container, and a suction pipe is attached to each of them. When the cylinder is welded and fixed to the sealed container, the inner diameter of the cylinder is distorted and deformed, and the roundness of the inner diameter is deteriorated.In addition, when the suction pipe for guiding the refrigerant to each cylinder is welded and fixed to the sealed container, Similarly, it is known that the inner diameter of the cylinder is distorted and the gap between the rotor and the stator of the electric element portion changes.

In addition, the compression chamber is oil-sealed by refrigeration oil sealed in a hermetic container to prevent the refrigerant from leaking from the high pressure side to the low pressure side. Here, the deterioration of roundness due to strain deformation due to cylinder bolt tightening or inner diameter strain deformation due to welding changes the gap between the rolling piston and the cylinder, making it impossible to secure an appropriate oil seal, and the high pressure side compression chamber Increases the leakage of refrigerant to the low-pressure side compression chamber or increases the sliding resistance, thereby reducing the compression efficiency and the compressor performance.
Therefore, the multi-cylinder rotary compressor disclosed in Patent Document 1, the multi-cylinder rotary compressor disclosed in Patent Document 2, and the rotary compressor disclosed in Patent Document 3 have a true inner diameter due to strain deformation of the inner diameter of the cylinder, which is strain deformation due to bolt fastening during assembly. Deterioration of the circularity and distortion of the end face cause refrigerant leakage (leakage loss) and an increase in sliding resistance (sliding loss), resulting in a decrease in compressor efficiency and a decrease in compressor performance.
Further, in the rotary compressor of Patent Document 3, the cylinder is welded and fixed to the sealed container and the suction pipe is welded and fixed to the sealed container. ) And an increase in sliding resistance (sliding loss), and further, by changing the gap between the rotor and stator of the electric element part by welding and fixing the suction pipe to the sealed container (becomes non-uniform), There is also a problem that electromagnetic noise increases.

An object of the present invention is to obtain a high-performance two-cylinder hermetic rotary compressor that prevents distortion and deformation of a cylinder or the like accompanying bolt fastening during assembly, prevents a decrease in efficiency.
Another object of the present invention is to obtain a high-performance two-cylinder hermetic rotary compressor that prevents deformation of the cylinder and the like due to welding to the hermetic container during assembly, prevents a decrease in efficiency.
Another object of the present invention is to obtain a high-performance two-cylinder hermetic rotary compressor with low electromagnetic noise.

  In order to solve the above-described object, the two-cylinder hermetic rotary compressor of the present invention has a first bearing and a second bearing that have substantially the same size in the radial direction. Assembling, the first bearing and the first cylinder are bolted directly to a position having a predetermined distance from the forefront in the radial direction of the first bearing, and the second bearing and the second cylinder are directly connected. The bolt is fastened to a position having a predetermined interval in the radial direction from the forefront of the second bearing, and both cylinders are bolted directly via an intermediate partition plate, and the bolt fastening positions of both cylinders are It was set as the position which has a predetermined space | interval in the radial direction inner side from the front-end | tip of both bearings.

  In the two-cylinder hermetic rotary compressor of the present invention, both the bearings of the compression element portion and the assembly of both cylinders are determined from the forefront in the radial direction of the first bearing directly between the first bearing and the first cylinder. The second bearing and the second cylinder are directly bolted to the position having a predetermined distance in the radial direction from the forefront of the second bearing, and the two cylinders are directly placed in the middle. Bolts are tightened via a partition plate, and the bolt tightening positions of both cylinders are located at a predetermined distance from the leading edge of both bearings toward the inside in the radial direction. However, as with the bolt fastening position of both bearings, it is radially inward from the leading edge of both bearings, and the predetermined interval from the leading edge of both bearings is close between the bearing fastening and the cylinder fastening, Bolt fastening position of bearing A bolt fastening position of the cylinder can Keru not a close, even if both cylinders and bolt fixing, outer contracts by fastening and fixing, can be prevented cylinder is strain deformed so as to expand the inner. Therefore, an increase in refrigerant leakage loss and an increase in sliding loss can be prevented, a reduction in compressor efficiency can be prevented, and compressor performance can be improved.

Embodiment 1 FIG.
Hereinafter, a two-cylinder hermetic rotary compressor of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing a two-cylinder hermetic rotary compressor according to Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view of a main part showing a compression element part of FIG.
In these drawings, a two-cylinder hermetic rotary compressor is housed in an upper part of a hermetic container 1, and an electric element part 2 including a rotor and a stator, a compression element part housed in a lower part, and a hermetic container 1 has a discharge pipe 13 projecting from the inside to the outside, an external suction accumulator 14, a suction pipe 15 inserted from the suction accumulator 14 into the sealed container 1, and the like.
This compression element portion closes the opening of the lower end surface of the upper cylinder 4 between the rotary shaft 3 driven by the electric element portion 2, the upper and lower cylinders 4, 5, and the upper and lower cylinders 4, 5, and the upper end surface of the lower cylinder 5 The intermediate partition plate 6 that closes the opening of the upper cylinder 4, the opening of the upper end surface of the upper cylinder 4, the main bearing 7 that is the bearing of the rotating shaft 3, and the opening of the lower end surface of the lower cylinder 5 are closed, and the bearing of the rotating shaft 3 A certain secondary bearing 8 (the size in the radial direction is substantially the same as that of the main bearing 7), a rolling piston 9 and 10 which are fitted in the rotary shaft 3 and rotate in the cylinders 4 and 5, respectively, Discharge mufflers 11 and 12 fixed to the bearing 8 respectively, and an elastic member 19 provided between the auxiliary bearing 8 and the discharge muffler 12.
The first bearing and the second bearing correspond to the main bearing 7 and the auxiliary bearing 8, respectively, and the first cylinder and the second cylinder correspond to the upper cylinder 4 and the lower cylinder 5, respectively.

  One of the upper and lower cylinders 4 (5) is fixed to the inner surface of the sealed container 1 by welding, and the suction pipe 15 is inserted only into the cylinder 4 (5). In order to suck the refrigerant into the other cylinder 5 (4), a suction flow path branched in the cylinder 4 (5) is provided, the suction flow path passes through the intermediate partition plate 6, and the other cylinder 5 The refrigerant communicates with the inclined groove provided in (4). In this example, as shown in FIG. 1, the upper cylinder 4 is fixed to the sealed container, the suction pipe 15 is inserted into the upper cylinder 4, and is fixed to the sealed container 1 by brazing welding. Hereinafter, this example will be described.

The fixing of the upper and lower cylinders 4 and 5 and the fixing of the main auxiliary bearings 7 and 8 will be described.
The main bearing 7 is fixed directly to the upper cylinder 4 with bolts 21, and the auxiliary bearing 8 is fixed to the lower cylinder 5 directly with bolts 22. At this time, the position of the bolts 21 and 22 is set to the inside of the flange portions 7a and 8a which are the distal ends of the both bearings 7 and 8 in the radial direction. That is, bolt fastening is performed at a position having a predetermined interval (generally, a bolt fastening interval) in the radial direction from the forefront of both bearings 7 and 8. Moreover, the bolt fastening of the main bearing 7 and the sub bearing 8 is made into multiple places in the circumferential direction of both bearings.
The upper and lower cylinders 4, 5 are directly fastened and fixed by bolts 23 via the intermediate partition plate 6. The position of the fastening bolt 23 is provided on the inner side of the flange portions 7a and 8a of the bearings 7 and 8 in the radial direction. In other words, the bolts are fastened to a position having a predetermined distance in the radial direction from the forefront of the bearings 7 and 8. This predetermined interval is, for example, close to a predetermined interval at the time of fastening the bearing, and is substantially the same position as the bolt fastening position of both the bearings 7 and 8 in the radial direction. In order to directly fasten the cylinders 4 and 5 with bolts, the heads of the bolts 23 are embedded in the main bearing 7 or the sub-bearing 8 as shown in FIGS. Moreover, the bolt fastening of the cylinders 4 and 5 is made into multiple places in the circumferential direction of both bearings.

Next, the mounting of the discharge mufflers 11 and 12 will be described.
A discharge muffler 11 is attached to the main bearing 7 as shown in FIG. The discharge muffler 11 is elastically fitted to the radially outer end of the disc portion 7c of the main bearing 7 and the boss portion 7b, and presses the outer end of the disc portion 7c of the main bearing 7 and the boss portion 7b, respectively. (In part, including fixing to the upper cylinder 4 together with the main bearing 7 with the bolt 21 on the radially outer end side of the disk portion 7c). The boss 7b side of the discharge muffler 11 may be extended by pressing the outer end of the boss 7b until the tip of the discharge muffler 11 is hooked on the outer end of the boss 7b. In this case, similarly to the case of the sub-bearing 8 described later, the ring-shaped elastic member 19 is disposed at the outer end portion of the boss portion 7 b and pressed through the elastic member 19, thereby opening the end surface of the cylinder 4. It is possible to prevent distortion of the end surface of the disc portion 7c of the main bearing 7 that closes the shaft.

In addition, as shown in FIG. 3 (a), the discharge muffler 12 is attached to the auxiliary bearing 8 in the prior art by the outer end in the radial direction of the disk portion 8c of the auxiliary bearing 8 and the outer end of the tip of the boss portion 8b. (It is also included that the bolt 22 is fixed together with the auxiliary bearing 8 to the lower cylinder 5 on the distal end side in the radial direction.) In this case, the end surface of the disk portion 8c of the sub bearing 8 is distorted and deformed by the fastening force from the fitting portion of the discharge muffler 12 to the outer end portion of the boss portion 8b of the sub bearing 8 (FIG. 3A). And the deformation shown by the dotted line on the end face of the auxiliary bearing 8). Therefore, in this example, as shown in FIG. 3B, a ring-shaped elastic member 19 is provided between the outer end portion of the boss portion 8 b of the auxiliary bearing 8 and the fitting portion of the discharge muffler 12. For example, a ring-shaped elastic member 19 that is a resin molded product is provided. By doing so, even if a fastening force from the fitting portion of the discharge muffler 12 to the outer end portion of the boss portion 8b of the auxiliary bearing 8 is applied in the same manner, the disk of the auxiliary bearing 8 is operated by the elastic member 19. The end face of the portion 8c is not distorted, and performance degradation due to an increase in sliding loss and leakage loss is prevented. Further, the outer end of the boss portion 8 b of the auxiliary bearing 8 is hermetically sealed by the discharge muffler 12, so that the compressed refrigerant gas does not blow out into the refrigerating machine oil 20 stored at the bottom of the hermetic container 1.
The elastic member 19 is preferably disposed at the outer end portions of the boss portions 7b and 8b of the both bearings 7 and 8, but either one has an effect of preventing distortion deformation.

  The operation of the two-cylinder hermetic rotary compressor configured as described above will be described below. The rotating shaft 3 is rotated by the electric element 2, and the rolling pistons 9 and 10 perform eccentric rotational movement in the compression chambers 17 and 18 of the upper and lower cylinders 4 and 5. As a result, the refrigerant gas is sucked into the compression chambers 17 and 18 from the refrigeration cycle outside the compressor. However, the refrigerant gas is sucked into the upper cylinder 4 through the suction accumulator 14 and the suction pipe 15 and then branched in the upper cylinder 4. It is guided to the lower cylinder 5 through the suction passage. The refrigerant gas compressed in the upper and lower cylinders 4, 5 is discharged into the discharge mufflers 11, 12 and then guided to the sealed container 1 to cool the electric element 2, and then provided on the upper part of the sealed container 1. The discharged discharge pipe 13 leads to an external refrigeration cycle.

  In this two-cylinder hermetic rotary compressor, as shown in FIG. 2, the upper and lower cylinders 4 and 5 are directly fastened and fixed by bolts 23 via the intermediate partition plate 6. Compared to the case, it is arranged on the inner side, and is provided on the inner side of the flanges 7 a and 8 a which are the tip portions of the main bearing 7 and the auxiliary bearing 8. This is substantially the same position as the fastening and fixing position of the bolts 21 and 22 of the main bearing 7 and the auxiliary bearing 8 fixed to the upper and lower cylinders 4 and 5, respectively, and the flange portions 7 a and 8 a of the main bearing 7 and the auxiliary bearing 8. The bolt fastening part is escaped. As a result, even if the upper and lower cylinders 4 and 5 are bolt-fixed, the outer side contracts due to fastening and the inner side is expanded and the inner side is expanded and the rolling pistons 9 and 10 fitted in the cylinders 4 and 5 are not deformed. It is possible to prevent the performance of the gap from changing due to an increase in leakage loss. That is, the bolt fastening positions of both cylinders 4 and 5 are radially inward of the leading ends of both bearings 7 and 8 in the same manner as the bolt fastening positions of both bearings 7 and 8, and the leading edges of both bearings 7 and 8. , The bolt fastening position of the bearings 7, 8 and the bolt fastening position of the cylinders 4, 5 are brought closer to each other. Even if both cylinders 4 and 5 are bolted, it is possible to prevent the cylinders 4 and 5 from being distorted and deformed so that the outside contracts by fastening and the inside spreads.

  In the two-cylinder hermetic rotary compressor, only the upper cylinder 4 of the upper and lower cylinders 4 and 5 (only the lower cylinder 5 or only one of them) is fixed to the sealed container 1 by welding. The amount of heat is reduced, effective for preventing distortion deformation of the compression element portion, and effective for reducing leakage loss and sliding loss.

  Further, in this two-cylinder hermetic rotary compressor, the assembled compression element part is welded and fixed to the hermetic container 1 together with the electric element part 2, and the suction pipe 15 is inserted and brazed, but the upper and lower cylinders 4, Only the upper cylinder 4 is fixed to the sealed container 1 by welding, the suction pipe 15 is inserted only into the upper cylinder 4 and fixed to the sealed container by welding, and the suction flow in the upper cylinder 4 is supplied to the lower cylinder 5. The refrigerant gas is guided by the suction flow path branched from the passage. This is because, compared with the case where the suction pipe 15 is inserted into each of the cylinders 4 and 5 independently and the refrigerant is guided, the amount of heat input accompanying brazing welding when the suction pipe 15 is inserted is reduced, and the compression element portion The increase in electromagnetic noise is prevented by preventing distortion deformation of the motor element 2 and preventing deformation of the gap between the stator and the rotor of the electric element 2. Therefore, a low-noise two-cylinder hermetic rotary compressor can be obtained. However, only the lower cylinder 5 is fixed to the sealed container 1 by welding, the suction pipe 15 is inserted only into the lower cylinder 5 and fixed to the sealed container by welding, and the refrigerant suction into the upper cylinder 4 is performed in the same manner as described above. The same effect can be obtained.

Both the upper and lower cylinders 4 and 5 may be fixed to the sealed container 1 by welding. In this case, the suction pipe 15 may be inserted into both the cylinders 4 and 5 and fixed to the sealed container 1. Also in this case, the respective effects can be obtained by performing bolt fastening for the cylinders 4 and 5 and the bearings 7 and 8 described in the present embodiment, installation of an elastic member when the discharge muffler is mounted, and the like.
That is, the bolts related to the cylinders 4 and 5 and the bearings 7 and 8 described in the present embodiment, the installation of an elastic member when the discharge muffler is mounted, and only one of the cylinders 4 and 5 is fixed to the sealed container 1 by welding. For example, the suction pipe may be inserted only into this cylinder, or any two or more of them may be combined, and a two-cylinder hermetic compressor having the respective effects can be obtained.

Embodiment 2. FIG.
The two-cylinder hermetic rotary compressor according to the present embodiment is a two-cylinder hermetic rotary compressor described in the first embodiment, in which the refrigerant and the refrigerating machine oil are particularly specified. Other configurations and the like are the same as those in the first embodiment, and therefore, differences will be mainly described below.

  The refrigerant used is R410A, which is a high-pressure hydrofluorocarbon (HFC) having a zero ozone layer depletion potential (ODP), and the refrigerating machine oil 20 stored at the bottom of the hermetic container 1 correspondingly contains polyol ester. Oil (POE oil) is applied. In the case of the R410A refrigerant, the refrigerant density is higher than that of the conventional hydrochlorofluorocarbon (HCFC) refrigerant R22, and the displacement of the compressor can be reduced to about 70% in order to obtain the same capacity. In order to reduce the amount of displacement, it is common to reduce the thickness of the cylinder that constitutes the compression chamber. In this case, the rigidity of the cylinders 4 and 5 is reduced, the performance of assembly distortion and welding distortion is reduced, electromagnetic Although the influence on the noise increase becomes large, even when the R410A refrigerant is applied, it is possible to obtain a high-efficiency, low-noise two-cylinder hermetic rotary compressor by adopting the present structure described in the first embodiment. it can.

  In the above example, the case where the R410A refrigerant is used as the refrigerant is shown. However, the same applies when the refrigerant is R407C, which is also hydrofluorocarbon (HFC), and as the refrigerating machine oil, polyvinyl ether oil (PVE oil) is used. The same effect is also obtained when using a hydrofluorocarbon (HFC) refrigerant or an incompatible or weakly compatible alkylbenzene oil (AB oil).

  As described above, in the present two-cylinder hermetic rotary compressor, the refrigerant uses a hydrofluorocarbon (HFC) refrigerant such as R410A or R407C, and the refrigerating machine oil is polyol ester oil (POE oil), polyvinyl ether oil (PVE oil) or Using alkylbenzene oil (AB oil), the suction pipe is inserted into only one of the upper and lower cylinders, and the other is provided with a suction passage branching in the cylinder to guide the refrigerant. The upper and lower cylinders are connected via an intermediate partition plate. Bolts are fixed directly, and the fastening bolts close the end faces of the upper and lower cylinders, and are directly fixed to the respective bolts. The structure is provided inside the flanges of the main and sub-bearings that support the rotating shaft. -A low-noise two-cylinder hermetic rotary compressor can be obtained.

  The two-cylinder hermetic rotary compressor described in the first or second embodiment can be used as a compressor for a refrigeration air conditioner. That is, a refrigerating and air-conditioning apparatus including the two-cylinder hermetic rotary compressor, a heat source side heat exchanger, a use side heat exchanger, a refrigerant pipe connecting the compressor and both heat exchangers, and a blower By doing so, a refrigeration air conditioner having the effect of the two-cylinder hermetic rotary compressor described in the first or second embodiment can be obtained.

  The two-cylinder hermetic rotary compressor can be widely used in a refrigeration air conditioner.

1 is a longitudinal sectional view showing a two-cylinder hermetic rotary compressor according to a first embodiment of the present invention. It is principal part sectional drawing which shows the compression element part of FIG. It is a figure explaining the function of the elastic member of the 2-cylinder hermetic rotary compressor of Embodiment 1 of the present invention. It is a figure explaining generation | occurrence | production of the distortion deformation of the cylinder of the conventional 2 cylinder sealed rotary compressor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container, 2 Electric element part, 4 1st cylinder, 5 2nd cylinder, 6 Intermediate partition plate, 7 1st bearing, 7b boss | hub part, 7c Disc part, 8 2nd bearing, 8b boss | hub part , 8c Disc part, 11, 12 Discharge muffler, 15 Refrigerant suction pipe, 19 Elastic member, 21 bolt (first bearing), 22 bolt (second bearing), 23 bolt (cylinder).

Claims (7)

An electric element part in the hermetic container, a first cylinder in which the opening of the end surface is closed with the first bearing and the intermediate partition plate, and the second bearing having the opening in the end surface having substantially the same radial size as the first bearing. A compression element portion having two cylinders of a second cylinder closed by the bearing and the intermediate partition plate,
Assembling the two bearings and the two cylinders of the compression element portion is performed at a position having a predetermined distance from the forefront in the radial direction of the first bearing directly between the first bearing and the first cylinder. The second bearing and the second cylinder are directly bolted to a position having a predetermined distance in the radial direction from the forefront of the second bearing, and the two cylinders are directly connected to the intermediate partition. Done by fastening the bolts through the plate,
The two-cylinder hermetic rotary compressor is characterized in that the bolt fastening positions of the two cylinders are positions having a predetermined distance from the forefront of the two bearings toward the inside in the radial direction.   2. The two-cylinder according to claim 1, wherein a predetermined interval from the leading edge of the bolt fastening of the two bearings and a predetermined interval from the leading edge of the bolt fastening of the two cylinders are substantially equal. Hermetic rotary compressor.   The two-cylinder hermetic rotary compressor according to claim 1 or 2, wherein one of the two cylinders is fixed to the sealed container by welding.   When a refrigerant suction pipe for sucking refrigerant is inserted into a cylinder fixed to the sealed container by welding and fixed to the sealed container by welding, and there is a cylinder that is not fixed to the sealed container among the two cylinders. The two-cylinder according to any one of claims 1 to 3, wherein refrigerant is sucked into the cylinder through a branch suction passage formed in the cylinder in which the suction pipe is inserted. Hermetic rotary compressor. Two cylinders: an electric element part in a sealed container, a first cylinder in which an opening of an end face is closed with a first bearing and an intermediate partition plate, and a second cylinder in which a second bearing and the intermediate partition plate are closed And a compression element having
Also, the both bearings of the compression element portion have a discharge muffler that is fixed by elastically pressing the outer end portion of the boss portion and the outer end portion of the disc portion that closes the opening of the cylinder end surface. The at least one of the two discharge mufflers presses the end portion of the boss portion through an elastic member disposed between the end portion of the boss portion and the discharge muffler. Compressor.   6. The refrigerant according to claim 1, wherein the refrigerant is a hydrofluorocarbon refrigerant such as R410A or R407C, and the refrigerating machine oil is a refrigerating machine oil of polyol ester oil, alkylbenzene oil, or polyvinyl ether oil. A two-cylinder hermetic rotary compressor according to claim. The two-cylinder hermetic rotary compressor according to any one of claims 1 to 6, a heat source side heat exchanger, a use side heat exchanger, the compressor, and both the heat exchangers are connected. A refrigerating and air-conditioning apparatus comprising: a refrigerant pipe that performs cooling, a blower, and the like.

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