JP2007146822A - Rotary compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the increase of vibration of a compressor and to improve efficiency at the same time even in the low rotating speed operation of the compressor by mounting a mass body to either the upper or lower end face of a rotor. <P>SOLUTION: This rotary compressor comprises a driving element and a rotary compression element driven by the driving element in a sealed container, wherein either the upper (anti-compression mechanism side) or lower (compression mechanism side) end face of the rotor constituting the driving element is provided with a rotational inertia body 82 formed of a laminated body 26 formed by using plates of copper and a copper alloy as a material and laminating the plates, to obtain rotational moment of inertia. The increase of rotational vibration of the compressor is thereby suppressed even in the low rotating speed operation of the compressor, and the compressor of high efficiency can be obtained. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a rotary compressor provided with a drive element in a hermetically sealed container, a rotary compression element driven by a rotation shaft of the drive element, and a bearing that cantileverably supports the rotation shaft of the rotation element. It is.

Conventionally, a rotary compressor of this type, for example, a multi-stage compression rotary compressor having first and second rotary compression elements, has a first and a second driven by a drive element and a rotary shaft of the drive element in a sealed container. 2 rotational compression elements.

  The electric element is composed of a stator that is welded and fixed in an annular shape along the inner peripheral surface of the upper space of the hermetic container, and a rotor that is inserted and installed at a slight interval inside the stator. , Fixed to a rotating shaft extending through the center in the vertical direction.

The first and second rotary compression elements are provided on the rotating shaft with an intermediate partition plate, upper and lower cylinders disposed above and below the intermediate partition plate, and a 180 degree phase difference inside these cylinders. Rollers that are fitted to the eccentric portion and rotate eccentrically, vanes that contact the rollers and divide the cylinder into a low-pressure chamber side and a high-pressure chamber side, an upper opening surface of the upper cylinder, and a lower cylinder Each side opening surface is closed, and includes an upper support member and a lower support member each having a bearing for a rotating shaft, and discharge muffler chambers formed vertically. Each discharge silencer chamber and the high-pressure chamber side in each cylinder communicate with each other via a discharge port, and a discharge valve that closes the discharge port in an openable and closable manner is provided in the discharge silencer chamber. (For example, see Patent Document 1)
JP 2004-19599 A

  In the rotor of a conventional rotary compressor, a rotational angular velocity that is inversely proportional to the rotational inertia moment is generated in proportion to the difference between the compression torque and the motor torque. Causes rotational vibration of the rotary compressor. The rotational angular velocity of the rotor is an integral with respect to the time of the rotational angular velocity that is inversely proportional to the rotational moment of inertia, and returns to the original rotational angular velocity even with one revolution, so the time required for one revolution increases as the compressor speed decreases. There is a problem in that the fluctuation range of the rotational angular velocity during one rotation is increased, thereby increasing the vibration of the compressor.

  In addition, when the fluctuation range of the rotational angular velocity during one rotation is large, the ratio of operation in the rotational angular velocity region where the efficiency is low increases, and the efficiency of the motor decreases. Therefore, the efficiency of the compressor decreases as the motor speed decreases. descend. Further, the smaller the compressor and the electric motor, the smaller the moment of inertia of rotation, and the above-described increase in compressor vibration and reduction in efficiency are likely to appear.

  The rotary compressor of the present invention has a drive element in a hermetically sealed container, a compression mechanism driven by the drive element, and a bearing that cantileverably supports the rotating shaft of the rotating element, and the lower surface of the rotor ( The compression mechanism side) has a mass body extending below the stator and capable of obtaining a rotational inertia moment, and the mass body is a laminated body in which copper and copper alloy plates are laminated.

  According to a second aspect of the present invention, the rotary compressor has a driving element in the hermetic container, a compression mechanism driven by the driving element, and a bearing that rotatably supports the rotating shaft of the rotating element. The upper surface (on the side of the anti-compression mechanism) has a mass body that extends to the lower side of the stator and obtains a rotational inertia moment, and the mass body is a laminate in which copper and copper alloy plates are laminated. To do.

  Further, in addition to the above, the rotary compressor according to claim 3 is formed so that the shape of the mass body provided in the rotor is thinner than the same outer diameter or outer diameter of the rotor from the stator coil to the necessary insulation distance, After the insulation distance, a necessary rotational inertia moment can be obtained by forming the outer diameter to a size that covers the stator coil toward the inner wall side of the sealed container.

  In addition to claims 1 to 3, the rotary compressor of claim 4 has a discharge port for discharging compressed gas from the rotary element into the sealed container, and is 1/2 of the maximum outer diameter of the mass body provided in the rotor. The oil discharge amount to the outside of the compressor is reduced by being positioned within the range.

  As described above in detail, according to the present invention, a sealed element is provided with a drive element, a rotary compression element driven by the drive element, and a bearing that cantileverably supports the rotary shaft of the rotary element. The rotational speed of the compressor is obtained by attaching a mass body that can obtain a rotational moment of inertia to the rotor to either one of the end surfaces of the upper part (anti-compression mechanism side) or the lower part (compression mechanism side) of the rotor. Even when the operation is low, it is possible to provide an efficient compressor while suppressing an increase in compressor vibration. In addition, the mass body to be attached is made of copper and copper alloy having a large specific gravity, and the mass body is a laminated body in which copper and copper alloy plates are laminated. It becomes possible to easily cope with a change in weight of the mass body due to a change in output or the like. In addition, since it extends to the stator side, it is possible to reduce the dimension in the thickness direction by enlarging the dimension in the width direction of the mass body, and to reduce the dimension in the height direction of the entire compressor. it can.

According to the invention of claim 3, in addition to the above, the shape of the mass body provided on the rotor is formed to be the same outer diameter as the rotor or smaller than the rotor outer diameter from the stator coil to the required insulation distance. After the insulation distance, the required rotational inertia moment can be obtained by forming the outer diameter to a size that covers the stator coil toward the inner wall side of the sealed container.

According to the invention of claim 4, in addition to claims 1 to 3, the discharge port for discharging the compressed gas from the rotating element into the sealed container has a 1 / out of the maximum outer diameter of the mass body provided in the rotor. By being positioned within 2, the oil in the discharge gas is separated by the mass body, and the amount of oil discharged to the outside of the compressor can be reduced.

  The present invention is characterized in that a rotary compressor can be made highly efficient by attaching a rotary inertia body to the rotor while suppressing an increase in vibration of the compressor even in a low rotation range. It is also possible to cope with increased vibration and reduced efficiency due to the downsizing of the compressor. Further, the material of the mass body provided in the rotor is copper and copper alloy, and is a mold-molded product or a forged molded product, and the outer diameter or the same as the rotor is used until the shape reaches the required insulation distance from the stator coil. The rotor is formed thinner than the outer diameter of the rotor, and after the insulation distance, the outer diameter is expanded to a size that covers the stator coil on the inner wall side of the sealed container. By positioning the discharge port for discharging compressed gas from the element into the sealed container within 1/2 of the maximum outer diameter of the mass body provided in the rotor, the oil in the discharge gas is separated by the mass body, and the compressor outside It is characterized in that the oil discharge amount to the is reduced.

  Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an embodiment of the rotary compressor of the present invention, which includes first and second rotating elements 32 and 34, and a mass body attached to a compression mechanism side of the rotor 24 by a rivet 73, that is, a rotary inertia body 82. 1 is a longitudinal side view of an internal high-pressure rotary compressor 10 provided with FIG. 2 shows a longitudinal side view of claim 2.

In FIG. 1, a rotary compressor 10 according to an embodiment is an internal high-pressure rotary compressor 10 and is disposed as a driving element disposed in an upper side of the internal space of the sealed container 12 in a vertical cylindrical sealed container 12 made of a steel plate. And a rotary compression mechanism portion 18 including a first rotary compression element 32 and a second rotary compression element 32, which are disposed on the lower side of the electric element 14 and driven by the rotary shaft 16 of the electric element 14. ing. In the rotary compressor 10 of the embodiment, carbon dioxide is used as a refrigerant.

The hermetic container 12 has an oil reservoir at the bottom, and includes a container body 12A that houses the electric element 14 and the rotary compression mechanism, and a substantially bowl-shaped end cap (lid body) 12B that closes the upper opening of the container body 12A. In addition, a circular mounting hole 12D is formed on the upper surface of the end cap 12B, and a terminal (wiring is omitted) 20 for supplying power to the electric element 14 is mounted in the mounting hole 12D. Yes.

  The electric element 14 includes a stator 22 welded and fixed in an annular shape along the inner peripheral surface of the upper space of the sealed container 12, a rotor 24 inserted and installed at a slight interval inside the stator 22, and the rotor The rotor 24 and the rotary inertia body 82 are fixed to the rotary shaft 16 that passes through the center and extends in the vertical direction.

  Here, the rotary inertia body 82 is formed to have the same outer diameter as the rotor 24 or thinner than the outer diameter of the rotor 24 from the stator coil 28 to the minimum necessary insulation distance (which varies depending on the applied voltage). After the insulation distance, the outer diameter is increased in the direction of covering the stator coil 28 toward the inner wall side of the sealed container 12. By adopting a shape in which the outer diameter is enlarged, a large rotational inertia moment can be obtained with a small amount of material.

  In this case, as the material of the rotary inertia body 82, copper and a copper alloy are used, and a mold-molded product, a forged product, or a laminated body in which copper and copper alloy plates are laminated.

The stator 22 has a laminated body 26 in which donut-shaped electromagnetic steel plates are laminated, and a stator coil 28 wound around the teeth of the laminated body 26 by a direct winding (concentrated winding) method. Similarly to the stator 22, the rotor 24 is also formed of a laminated body 30 of electromagnetic steel plates.

  The first rotary compression element 32 and the second rotary compression element 34 have the second rotary compression element 34 at the second stage sandwiched by an intermediate partition plate 36 as an intermediate partition member, and the electric element 14 in the sealed container 12. The first rotary compression element 32 that is the first stage is arranged on the side opposite to the electric element 14. That is, the first rotary compression element 32 and the second rotary compression element 34 are composed of the lower cylinder 40 as the first cylinder and the upper cylinder as the second cylinder constituting the first and second rotary compression elements 32, 34. The opening of the lower cylinder 40 on the side of the electric element 14 (upper side) and the opening of the upper cylinder 38 opposite to the electric element 14 (lower side) are closed by being interposed between the cylinder 38 and the cylinders 38 and 40. The intermediate partition plate 36 and the upper and lower cylinders 38 and 40 are fitted into first and second eccentric portions 42 and 44 provided on the rotary shaft 16 with a phase difference of 180 degrees, and the cylinders 38 and 40 are fitted. A first roller 48 and a second roller 46 that rotate eccentrically in each of them, and vanes (not shown) that abut against the rollers 46 and 48 and divide the cylinders 38 and 40 into a low-pressure chamber side and a high-pressure chamber side, respectively. And the lower cylinder 40 A lower support member 56 serving as a first support member having a bearing 56A of the rotary shaft 16 by closing an opening (lower side) opposite to the moving element 14 side, and the electric element 14 side (upper side) of the upper cylinder 38 ) And the upper support member 54 as the second support member having the bearing 54A of the rotary shaft 16 and the upper support members 54A and 56A provided on the outer sides of the bearings 54A and 56A. A cover 63 for constituting the discharge silencing chamber 62 is attached to the lower support member 56, and a closing plate 68 for constituting the intermediate pressure discharge silencing chamber 64 is provided on the lower support member 56.

  The upper support member 54 and the lower support member 56 are provided with suction passages 58 and 60 that communicate with the inside of the upper and lower cylinders 38 and 40 through suction ports 160 and 161, a discharge silencer chamber 62, and an intermediate pressure discharge silencer chamber 64, respectively. It has been. The discharge silencing chamber 62 is formed by recessing the surface opposite to the upper cylinder 38 of the upper support member 54 and closing the recess with the cover 63 as described above. In addition, the intermediate pressure discharge muffler chamber 64 is formed by recessing the surface opposite to the lower cylinder 40 of the lower support member 56, closing the recess with the closing plate 68, and forming the closing plate 68. That is, the discharge silencing chamber 62 is closed by the cover 63, and the intermediate pressure discharge silencing chamber 64 is closed by the closing plate 68.

In this case, a bearing 54 </ b> A is formed upright at the center of the upper support member 54. A discharge silencer chamber 62 formed by the cover 63 is provided on the outer periphery of the bearing 54A, and gas discharged from a discharge port (not shown) passes through the discharge silencer chamber 62 and passes between the upper part of the upper bearing 54A and the cover 63. It is discharged into the sealed container 12 through a communication passage 65 that is a donut-shaped gap.

A bearing 56 is formed through the center of the lower support member 56. The bearing 56A has a substantially donut shape with the rotation shaft 16 as a center and a hole through which the rotation shaft 16 passes in the center. Further, an intermediate pressure discharge silencing chamber 64 is provided on the outer periphery of the bearing 56A. On the other hand, the closing plate 68 is formed of a donut-shaped circular steel plate, and is fixed to the lower support member 56 from below with bolts 80 at the peripheral portion. The lower surface opening of the intermediate pressure discharge silencing chamber 64 communicating with the inside of the lower cylinder 40 is closed. The bolt 80 is a bolt for assembling the first and second rotary compression elements 32 and 34, and the tip thereof is screwed into the upper cylinder 38. That is, the upper cylinder is formed with a thread groove that is threadedly engaged with a thread formed at the tip of the bolt 80.

Here, a procedure for assembling the rotary compression mechanism unit 18 including the first and second rotary elements 32 and 34 will be described. First, the cover 63, the upper support member 54, and the upper cylinder 38 are positioned, and the two upper bolts 78 and 78 screwed into the upper cylinder 38 are inserted from the cover 63 side (upper side) in the axial direction (downward direction). And integrate them. Thereby, the second rotary compression element 34 is assembled.

Next, the second rotary compression element 34 integrated with the upper bolt 78 described above is inserted into the rotary shaft 16 from the upper end side. Next, the intermediate partition plate 36 is assembled with the lower cylinder 40, inserted into the rotary shaft 16 from the lower end side, positioned with the already attached upper cylinder 38, and screwed into the lower cylinder 40. The upper bolts that are not to be inserted are inserted in the axial direction (downward) from the cover 63 side (upper side) to fix them.

Then, after the lower support member 56 is inserted into the rotary shaft 16 from the lower side, the closing plate 68 is also inserted from the lower end portion into the rotary shaft 16 to close the recessed portion of the lower support member 56, and the four lower bolts 80. Is inserted in the axial direction (upward) from the closing plate 68 side (lower side), and the first and second rotations are made by screwing the tip portions into thread grooves formed in the upper cylinder 38, respectively. The shaft elements 32 and 34 are assembled. In addition, since the 1st and 2nd eccentric parts 42 and 44 are formed in the rotating shaft 16, it cannot attach to the rotating shaft 16 by methods other than the order mentioned above. Therefore, the closing plate 68 is attached to the rotating shaft 16 last.

In this way, the second rotary compression element 34, the intermediate partition plate 36 and the lower cylinder 40, the lower support member 56, and the closing plate 68 are sequentially attached to the rotating shaft 16, and the lower side of the closing plate 68 attached last. Then, the first and second rotary compression elements 32 and 34 can be fixed to the rotary shaft 16 by inserting the four bolts 80 and screwing them into the upper cylinder 38.

  In this case, carbon dioxide (CO2), which is a natural refrigerant in consideration of flammability and toxicity, is used as the refrigerant, and the oil as the lubricating oil is, for example, mineral oil (mineral oil). Existing oils such as alkylbenzene oil, ether oil, ester oil, and PAG (polyalkyl glycol) are used.

The sleeves 140 and 141 are disposed on the side surfaces of the container main body 12 </ b> A of the sealed container 12 at positions corresponding to the suction passages 58 and 60 of the support member 54 and the lower support member 56, the discharge silencer chamber 64, and the electric element 14. 142, the refrigerant discharge pipe 96, and the service pipe 97 are fixed by welding. The sleeves 140 and 141 are adjacent to each other in the vertical direction, and the sleeve 142 is substantially diagonal to the sleeve 141.

  One end of a refrigerant introduction pipe 92 for introducing refrigerant gas into the upper cylinder 38 is inserted and connected into the sleeve 140, and one end of the refrigerant introduction pipe 92 communicates with the suction passage 58 of the upper cylinder 38. The refrigerant introduction pipe 92 passes through the upper portion of the sealed container 12 and reaches the sleeve 142, and the other end is inserted and connected into the sleeve 142 and communicates with the intermediate pressure discharge muffler chamber 64.

Also, one end of a refrigerant introduction pipe 94 for introducing refrigerant gas into the lower cylinder 40 is inserted and connected into the sleeve 141, and one end of the refrigerant introduction pipe communicates with the suction passage 60 of the lower cylinder 40. The refrigerant discharge pipe 96 is fixed by welding to the container main body 12 </ b> A, and one end of the refrigerant discharge pipe 96 is communicated with the sealed container 12.

Next, the operation of the rotary compressor 10 with the above configuration will be described. When the stator coil 28 of the electric element 14 is energized through the terminal 20 and a wiring (not shown), the electric element 14 is activated and the rotor 24 rotates. By this rotation, the first and second rollers 46 and 48 fitted into the first and second eccentric portions 42 and 44 provided integrally with the rotary shaft 16 are eccentrically rotated in the upper and lower cylinders 38 and 40. .

  Thus, the low pressure (first stage suction pressure is about 4 MPaG) sucked from the suction port 161 to the lower cylinder 40 through the refrigerant introduction pipe 94 and the suction passage 60 formed in the lower support member 56 to the low pressure chamber side. The refrigerant gas is compressed to an intermediate pressure by the operation of the first roller 48 and a vane (not shown). The refrigerant gas having an intermediate pressure is discharged from the high pressure chamber side of the lower cylinder 40 into an intermediate pressure discharge silencer chamber 64 formed in the lower support member 56 via a discharge port (not shown).

The intermediate-pressure refrigerant gas discharged into the intermediate-pressure discharge muffler chamber 64 passes through the refrigerant introduction pipe 92 communicated with the intermediate-pressure discharge muffler chamber 64, and a suction passage 58 formed in the upper support member 54. Through the suction port 160 to the low pressure chamber side of the upper cylinder 38.

The sucked intermediate-pressure refrigerant gas is compressed in the second stage by the operation of the roller 46 and a vane (not shown) to become a high-temperature and high-pressure refrigerant gas (about 12 MPaG). Then, high-temperature and high-pressure refrigerant gas is discharged from the high-pressure chamber side of the upper cylinder 38 to the discharge silencer chamber 62 formed in the upper support member 54 via a discharge port (not shown).

Then, the refrigerant discharged into the discharge silencer chamber 62 is discharged into the sealed container 12 from the communication passage 65 provided in the cover 63, then passes through the gap of the electric element 14 and moves to the upper part of the sealed container 12. Then, the refrigerant is discharged from the refrigerant discharge pipe 96 connected to the upper side of the sealed container 12 to the outside of the rotary compressor 10.

In this way, by attaching the rotary inertia body 82 to the rotor 24, it is possible to obtain the required rotational inertia moment, so that it becomes possible to suppress rotational vibration even in the low rotational speed range of the compressor, A highly efficient compressor is obtained. Further, by producing the rotary inertia body 82 from copper, a copper alloy, or the like, the rotary inertia moment necessary for vibration reduction can be obtained with an inexpensive material without increasing the shape of the rotor 24 using an expensive material. .

  Next, FIGS. 3 and 4 show another embodiment of the present invention, and FIG. 3 shows a longitudinal side view of the rotary compressor of the present invention. FIG. 4 is an enlarged view of a portion showing the positional relationship between the rotary inertia body of the present invention and the discharge port 65 for discharging discharge gas. The same parts as those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted. In the rotary compressor 10 as described in the above embodiment, the rotary inertia body 84 is formed to be enlarged to a size that covers the entire stator coil 28.

  Further, the discharge port 65 for discharging the discharge gas from the compression element 18 into the sealed container 12 is provided at a position within the maximum outer diameter 1/2 of the rotary inertia body 84 as shown in FIG.

Then, the refrigerant gas containing the oil discharged from the discharge port 65 hits the rotary inertia body 84 and is separated into oil and refrigerant by the rotational force of the rotary inertia body, and the separated oil returns to the oil reservoir of the compressor, The separated gas passes through the gap of the electric element 14, moves to the upper part in the sealed container 12, and is discharged to the outside of the rotary compressor 10 from the refrigerant discharge pipe 96 connected to the upper side of the sealed container 12.

In this way, by providing the discharge port 65 on the inner side within 1/2 of the rotary inertia body 84, the oil separation ability due to the rotation of the rotary inertia body is effectively utilized, and the oil discharge amount is reduced and stable. Oil supply is possible.

  In this embodiment, the internal high-pressure type rotary compressor 10 including the first and second rotary compression elements 32 and 34 is described as the rotary compressor. However, the present invention is not limited to this, and the single cylinder rotary compressor is used. It may be applied to a compressor and a rotary compressor having three or more stages of rotating elements. Further, the present invention is not limited to the internal high-pressure rotary compressor 10, and the present invention is applied to an internal intermediate pressure type in which the refrigerant compressed by the first rotary compression element is discharged into the hermetic container and then compressed by the second rotary compression element. May be applied.

  In the embodiment, the second rotation compression element 34 provided on the electric element 14 side is the second stage, and the first rotation compression element 32 opposite to the electric element 14 is the first stage, and the first rotation The refrigerant compressed by the compression element 32 is compressed by the second rotary compression element 34. However, the present invention is not limited to this, and the refrigerant compressed by the second rotary compression element is compressed by the first rotary compression element. It does n’t matter.

Further, when the displacement volume is different between the first compression mechanism and the second compression mechanism in the multistage compressor, the weight balance of the rotary inertia body 84 is changed according to the displacement volume of each compression mechanism, and the overall balance is changed. You may take things.

  Furthermore, in the present embodiment, the rotary shaft is described as a vertical type, but it goes without saying that the present invention is also applicable to a rotary compressor in which the rotary shaft is a horizontal type. Moreover, although carbon dioxide is used as the refrigerant of the rotary compressor, other refrigerants may be used.

It is a rotary compressor vertical side view of Example 1 of this invention. (Example of rotating inertial body attached to the compression mechanism) It is a rotary compressor vertical side view of Example 1 of this invention. (Example of rotating inertial body attached to the anti-compression mechanism) It is a rotary compressor vertical side view of Example 2 of this invention. It is an enlarged view which shows the position of the rotary inertia body and discharge outlet of Example 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Rotary compressor 12 Sealed container 12A Container main body 14 Electric element 16 Rotating shaft 18 Rotation compression mechanism 20 Terminal 22 Stator 24 Rotor 26 Laminated body 28 Stator coil 30 Laminated body 32 1st rotation compression element 34 2nd rotation compression element 38 On Cylinder 40 Lower cylinder 42 Second eccentric portion 44 First eccentric portion 46 Second roller 48 First roller 54 Upper support member 56 Lower support member 54A Upper support member bearing 56A Lower support member bearing 62 Discharge silencer chamber 64 Intermediate pressure discharge silence 63 Cover 65 Discharge port 68 Closure plate 70 Lower support member discharge port 73 Rivet 78 Upper bolt 80 Lower bolt 82 Rotating inertia

Claims (4)

  An electric element that is provided in a sealed container and includes a stator and a rotor, a rotary compression element that is driven by the electric element and compresses and discharges the refrigerant, and the rotary compression element and the rotor of the electric element are connected to each other. In the rotary compressor comprising a rotating shaft that is rotatably supported by a bearing, a mass body is provided on the lower surface of the rotor of the electric element so as to extend below the stator and obtain a rotational inertia moment. The rotary compressor is characterized in that the mass body is a laminated body in which copper and copper alloy plates are laminated. An electric element that is provided in a sealed container and includes a stator and a rotor, a rotary compression element that is driven by the electric element and compresses and discharges the refrigerant, and the rotary compression element and the rotor of the electric element are connected to each other. In the rotary compressor comprising a rotating shaft that is rotatably supported by a bearing, a mass body is provided on the upper surface of the rotor of the electric element so as to extend below the stator and obtain a rotational moment of inertia. The rotary compressor is characterized in that the mass body is a laminated body in which copper and copper alloy plates are laminated.   The motor that forms the drive element is a direct winding system, and the shape of the mass body provided in the rotor is formed to be thinner than the outer diameter of the rotor or the rotor outer diameter from the stator coil to the required insulation distance, 3. The rotary compressor according to claim 1, wherein after the insulation distance, the outer diameter is expanded to a size that covers the stator coil toward the inner wall side of the sealed container.   The rotary compressor according to any one of claims 1 to 3, wherein a discharge port for discharging compressed gas from the rotary element into the sealed container is positioned within a half of a maximum outer diameter of a mass body provided in the rotor. .