Title of Invention ROTARY COMPRESSOR
Technical Field [0001]
The present invention relates to a rotary compressor, and more particularly, to the structure of a hermetic container of a hermetic rotary compressor.
Background Art [0002]
In a hermetic rotary compressor as an example of a rotary compressor, internal components such as an electric motor and a compressor are hermetically enclosed in a container of an integrated type formed by welding. Further, a discharge pipe for discharging refrigerant and an airtight terminal to be connected to the internal component are provided on an upper portion of the hermetic container. When pressure in the hermetic container increases during operation of the hermetic rotary compressor, stress concentration between the discharge pipe and the airtight terminal causes deformation of the hermetic container. As a result, for example, leakage of the refrigerant may occur. [0003]
In Patent Literature 1, the following configuration has been proposed. Specifically, an upper portion of a hermetic container, which has hitherto been flat, is formed into a hemispheric shape, and a discharge pipe through which refrigerant flows is arranged at a center of the upper portion of the hermetic container. With such configuration, strength of the upper hermetic container against pressure is enhanced. [0004]
In Patent Literature 2, the following configuration has been proposed. Specifically, an upper hermetic container is formed into a dome shape as a whole by

a plurality of spherical surfaces, and an airtight terminal, accessories, and other components are arranged on a flat surface portion formed along the spherical surfaces. With such configuration, while strength of the upper hermetic container against pressure is enhanced, installation of the discharge pipe and the airtight terminal is facilitated.
Citation List Patent Literature [0005]
Patent Literature 1: Japanese Unexamined Patent Application Publication No. Hei 11-159456
Patent Literature 2: Japanese Unexamined Patent Application Publication No. 2015-124700
Summary of Invention Technical Problem [0006]
In order to achieve downsizing and a high capacity of the rotary compressor, it is conceivable to increase a circulation rate of the refrigerant. In such a case, it is required to increase a diameter of the discharge pipe to an appropriate size while maintaining an outer diameter of the hermetic container, to thereby suppress loss in the discharge pipe. However, when the diameter of the discharge pipe is increased, the airtight terminal and the discharge pipe provided on the upper portion of the hermetic container are brought close to each other. As a result, when the pressure in the hermetic container is high, stress concentrates on a region between the airtight terminal and the discharge pipe, and thus is liable to cause deformation. Even in a case of adopting the configuration proposed in Patent Literature 1 or Patent Literature 2, it is difficult to prevent the deformation caused in the above-mentioned region, and leakage of gas refrigerant, breakage of the airtight terminal, and other problems are caused.

[0007]
The present invention has been made to overcome the above-mentioned problems, and has an object to provide a rotary compressor, which is capable of securing strength of an upper hermetic container and facilitating arrangement of an airtight terminal even when a diameter of a discharge pipe is increased while an outer diameter of a hermetic container is maintained.
Solution to Problem [0008]
According to one embodiment of the present invention, there is provided a rotary compressor comprising a hermetic container accommodating therein a compression mechanism and an electric motor, the hermetic container including a barrel having a cylindrical shape; a first hermetic container to which a discharge pipe for discharging refrigerant is provided at a center portion of the first hermetic container, the first hermetic container closing an opening in one end of the barrel, and a second hermetic container closing an opening in an other end of the barrel, the first hermetic container including a flat surface portion on which an airtight terminal to be connected to the electric motor is arranged, and at least one curved surface portion, which forms a portion other than the flat surface portion, wherein the flat surface portion is inclined at a first inclination angle with respect to a first axis on an imaginary perpendicular plane that is formed by the opening in the one end and is orthogonal to an axial direction of the barrel, such that the closer a portion of the flat surface portion is to the discharge pipe, the more away the portion is from the imaginary perpendicular plane, and wherein the flat surface portion is inclined at a second inclination angle with respect to a second axis orthogonal to the first axis, such that the closer a portion of the flat surface portion is to the discharge pipe, the more away the portion is from the imaginary perpendicular plane.
Advantageous Effects of Invention [0009]

According to the rotary compressor of one embodiment of the present invention, the flat surface portion, on which the airtight terminal is arranged, is inclined at the first inclination angle and the second inclination angle with respect to the imaginary perpendicular plane orthogonal to the axial direction of the barrel. With this configuration, a distance between the discharge pipe and the airtight terminal and a distance between the airtight terminal and the hermetic container are extended. Even when the diameter of the discharge pipe is increased while the outer diameter of the hermetic container is maintained, stress is prevented from concentrating on a region between the discharge pipe and the airtight terminal, and hence the hermetic container is less liable to be deformed. Further, strength of the hermetic container can be sufficiently secured, and hence arrangement of the airtight terminal is facilitated.
Brief Description of Drawings [0010]
[Fig. 1] Fig. 1 is an internal configuration view for illustrating an inside of a rotary compressor according to an embodiment of the present invention.
[Fig. 2] Fig. 2 is a top view for illustrating an upper hermetic container.
[Fig. 3] Fig. 3 is a view for illustrating a cross section taken along the X axis of Fig. 2 when seen in the Y direction.
[Fig. 4] Fig. 4 is a view for illustrating a cross section taken along the Y axis of Fig. 2 when seen in the X direction.
[Fig. 5] Fig. 5 is a graph for showing comparison results of deformation amounts under internal pressure between the upper hermetic container in the embodiment of the present invention and a related-art upper hermetic container.
Description of Embodiments
[0011]
Embodiment
Fig. 1 is an internal configuration view for illustrating an inside of a rotary

compressor 100 according to an embodiment of the present invention. In the following description, as the rotary compressor 100, there is exemplified a twin rotary compressor 100 including two cylinders 25 provided in a compression mechanism 2. As illustrated in Fig. 1, the rotary compressor 100 is a hermetic electric compressor in which the compression mechanism 2 and an electric motor 3 are accommodated inside a hermetic container 1. A suction muffler 14 is connected to the hermetic container 1. Refrigerant is sucked through the suction muffler 14, and is discharged after being compressed to high pressure. [0012]
The hermetic container 1 includes a cylindrical barrel 11, an upper hermetic container 12 configured to close an upper opening of the barrel 11, and a lower hermetic container 13 configured to close a lower opening of the barrel 11. The upper hermetic container 12 is an example of a first hermetic container in the present invention, and the lower hermetic container 13 is an example of a second hermetic container in the present invention. Connection portions between the barrel 11 and the upper hermetic container 12 and between the barrel 11 and the lower hermetic container 13 are fixed together by welding. Thus, the hermetic container 1 is kept hermetic. Suction pipes 15 to be connected to the suction muffler 14 are provided on the barrel 11, and a discharge pipe 4 is provided on the upper hermetic container 12. The discharge pipe 4 is arranged on an extension line of a rotation shaft 21 and at a center portion of the upper hermetic container 12. Airtight terminals 16 and a rod 7 are provided on the upper hermetic container 12. The airtight terminals 16 are electrically connected to the electric motor 3 in the hermetic container 1. A cover configured to protect the airtight terminals 16 is mounted to the rod 7. The lower hermetic container 13 has a shape approximate to a hemispheric shape. In the lower hermetic container 13, there may be provided an oil supply mechanism configured to store lubricating oil that is to be supplied to the compression mechanism 2. [0013]
The electric motor 3 includes a rotator 31 and a stator 32. The stator 32 is

fixed to the barrel 11 of the hermetic container 1 by various fixing methods such as shrink fitting and welding, and is electrically connected by a lead wire to the airtight terminals 16 provided on the upper hermetic container 12. [0014]
The compression mechanism 2 includes the rotation shaft 21, a main bearing 22, an auxiliary bearing 23, rolling pistons 24, the cylinders 25, and vanes 26. The rotation shaft 21 is fixed to the rotator 31 of the electric motor 3, and is held by the main bearing 22 and the auxiliary bearing 23. The rolling pistons 24 are fixed to the rotation shaft 21, and are respectively accommodated in the cylinders 25 so as to be eccentrically rotatable. Insides of the cylinders 25 are partitioned by the vanes 26 for respective compression chambers. The refrigerant, which moves in the compression chambers and is compressed to the high pressure, is discharged to an internal space of the hermetic container 1. [0015]
Fig. 2 is a top view for illustrating the upper hermetic container 12. As illustrated in Fig. 2, the upper hermetic container 12 connected to the barrel 11 on an XY plane formed by an upper end of the cylindrical barrel 11 has a circular shape in top view. The discharge pipe 4 is provided at the center portion of the upper hermetic container 12. A surface of the upper hermetic container 12 includes a flat surface portion 17 and a curved surface portion 18. The flat surface portion 17 has an elliptic shape having end portions 17a and 17b, and an edge portion of the flat surface portion 17 is continuous with the curved surface portion 18. [0016]
The flat surface portion 17 is formed into an elliptic shape. The plurality of airtight terminals 16, to which the electric motor 3 in the hermetic container 1 is connected, are provided on one end portion 17a so that an outermost contour 16a of the airtight terminals 16 is continuous with the flat surface portion 17. Further, the rod 7 is provided on an other end portion 17b of the flat surface portion 17 so as to be perpendicular to the flat surface portion 17. The discharge pipe 4 provided at the center portion of the upper hermetic container 12 has an outer diameter of one tenth

or more and two tenths or less of an outer diameter of the upper hermetic container 12. Meanwhile, the curved surface portion 18 of the surface of the upper hermetic container 12 has, for example, a shape formed by a plurality of curved surfaces so as to be approximate to a hemispheric shape. [0017]
Fig. 3 is a view for illustrating a cross section taken along the X axis of Fig. 2 when seen in the Y direction. As illustrated in Fig. 3, when the flat surface portion 17 is seen in the Y direction, the flat surface portion 17 is inclined at an angle θ1 with respect to the XY plane formed by the upper end of the barrel 11, and the edge portion of the flat surface portion 17 is continuous with the curved surface portion 18 through a smooth curve of a recessed portion 18a. Specifically, at the inclination angle θ1 with respect to the X axis on the XY plane that is formed by the upper end of the barrel 11 and orthogonal to an axial direction of the barrel 11, the flat surface portion 17 is inclined away from the XY plane. The inclination angle θ1 is, for example, θ1=5 degrees, and the one end portion 17a of the flat surface portion 17 protrudes outwardly from a hemispheric surface formed by the curved surface portion 18. A distance between the one end portion 17a of the flat surface portion 17 and the XY plane formed by the upper end of the barrel 11 is larger than a distance between the other end portion 17b and the XY plane formed by the upper end of the barrel 11. When the flat surface portion 17 inclined at the inclination angle θ1 is continuous with the curved surface portion 18 through the recessed portion 18a, a distance along a plane between the outermost contour 16a of the airtight terminals 16 and a side surface of the discharge pipe 4, and a distance along a plane between the outermost contour 16a of the airtight terminals 16 and an inner surface of the upper hermetic container 12 are increased. The recessed portion 18a is formed to have a large thickness, and functions as a rib configured to enhance strength. [0018]
Fig. 4 is a view for illustrating a cross section taken along the Y axis of Fig. 2 when seen in the X direction. As illustrated in Fig. 4, when the flat surface portion 17 is seen in the X direction, the flat surface portion 17 is inclined at an angle of, for

example, θ2=10 degrees with respect to the XY plane formed by the upper end of the barrel 11. Specifically, at the inclination angle θ2 with respect to the Y axis orthogonal to the X axis, the flat surface portion 17 is inclined away from the XY plane. Also in this case, when the flat surface portion 17 is inclined at the inclination angle θ2, the distance along the plane between the outermost contour 16a of the airtight terminals 16 and the side surface of the discharge pipe 4, and the distance along the plane between the outermost contour 16a of the airtight terminals 16 and the inner surface of the upper hermetic container 12 are increased. When the flat surface portion 17 is seen in the Y direction, the one end portion 17a of the flat surface portion 17 protrudes outwardly from the curved surface portion 18, and the edge portion of the flat surface portion 17 is continuous with the curved surface portion 18 through the smooth curve of the recessed portion 18a. The XY plane is an example of an imaginary perpendicular plane in the present invention. The X axis and the Y axis are an example of a first axis and an example of a second axis, respectively. The inclination angle θ1 and the inclination angle θ2 are an example of a first inclination angle and an example of a second inclination angle, respectively. [0019]
As described above, in sectional view taken along each of two directions, that is, the X direction and the Y direction that are orthogonal to each other when the upper hermetic container 12 is seen from the top, the flat surface portion 17 is inclined with respect to the plane formed by the upper end of the barrel 11, and is smoothly continuous with the curved surface portion 18 through the recessed portion 18a. Accordingly, even when the distance between the airtight terminals 16 and the discharge pipe 4 in top view is maintained, the distance along the plane between the outermost contour 16a of the airtight terminals 16 and the side surface of the discharge pipe 4, and the distance along the plane between the outermost contour 16a of the airtight terminals 16 and the inner surface of the upper hermetic container 12 are extended. When the inclination angles θ1 and θ2 of the flat surface portion 17 are increased, the one end portion 17a of the flat surface portion 17 is further away from the curved surface portion 18, and the one end portion 17a of the flat

surface portion 17 protrudes outwardly from the curved surface portion 18, with the result that the distance from the one end portion 17a to the XY plane is increased. Accordingly, the distance along the plane between the airtight terminals 16 and the discharge pipe 4 is further extended. [0020]
In a case in which a diameter of the hermetic container is 100 mm, when the flat surface portion 17 has no inclination, the distance between the side surface of the discharge pipe 4 and the outermost contour 16a of the airtight terminals 16, and the distance between the outermost contour 16a of the airtight terminals 16 and the inner surface of the upper hermetic container 12 cannot be sufficiently secured. Meanwhile, in the flat surface portion 17 inclined at the inclination angles θ1 and θ2, when the distance between the side surface of the discharge pipe 4 and the outermost contour 16a of the airtight terminals 16 is set to 5 mm, and the distance between the outermost contour 16a of the airtight terminals 16 and the inner surface of the upper hermetic container 12 is set to 5 mm, design can be made pursuant to regulations of a distance for insulation. Therefore, it is desirable that the distance between the side surface of the discharge pipe 4 and the outermost contour 16a of the airtight terminals 16 is 5 mm or more, and that the distance between the outermost contour 16a of the airtight terminals 16 and the inner surface of the upper hermetic container 12 is 5 mm or more. Further, it is preferred that each of the inclination angles θ1 and θ2 of the flat surface portion 17 be 5 degrees or more and 30 degrees or less with respect to the XY plane. When each of the inclination angles θ1 and θ2 is set within this range, the distance between the side surface of the discharge pipe 4 and the outermost contour 16a of the airtight terminals 16, and the distance between the outermost contour 16a of the airtight terminals 16 and the inner surface of the upper hermetic container 12 are secured. Further, when the flat surface portion 17 is inclined, the airtight terminals 16 are prevented from projecting outwardly from the opening of the upper hermetic container 12 in plan view. [0021]
Next, operations of the rotary compressor 100 are described. The rotary

compressor 100 sucks the refrigerant from the suction muffler 14 through the suction pipes 15. The refrigerant sucked through the suction pipes 15 is led into the compression mechanism 2, and is discharged into the hermetic container 1 after being compressed by the compression mechanism 2 into high-temperature and high-pressure gas refrigerant. Then, the gas refrigerant passes through a space between the inner surface of the hermetic container 1 and the electric motor 3, and is discharged from the discharge pipe 4 on the upper hermetic container 12. As a result, the high-temperature and high-pressure gas refrigerant is generated by the rotary compressor 100. [0022]
When the refrigerant compressed by the compression mechanism 2 is discharged into the hermetic container 1, the hermetic container 1 receives an outward force from the high-temperature and high-pressure gas refrigerant. The barrel 11 and the lower hermetic container 13 of the hermetic container 1 respectively have a cylindrical shape and a shape approximate to a hemispheric shape. Owing to the above-mentioned shapes, stress concentration caused by the outward force is reduced. [0023]
Meanwhile, the surface of the upper hermetic container 12 includes the flat surface portion 17 having an elliptic shape, and the curved surface portion 18 having a shape approximate to a hemispheric shape. The airtight terminals 16 and the rod 7 are provided on the flat surface portion 17. The cover configured to protect the airtight terminals 16 is mounted to the rod 7. The discharge pipe 4 is provided on the curved surface portion 18 at a center position of the upper hermetic container 12. The flat surface portion 17 is inclined in two directions. The one end portion 17a of the flat surface portion 17 having an elliptic shape protrudes outwardly from the curved surface portion 18 of the upper hermetic container 12, and is extended to a position higher than the center of the upper hermetic container 12. Further, the flat surface portion 17 and the curved surface portion 18 are continuous with each other through the recessed portion 18a having a smoothly curved shape. Accordingly, the

distance between the airtight terminals 16 and the discharge pipe 4 is increased as compared to a case in which the upper hermetic container 12 is flat or a case in which the upper hermetic container 12 has a flat surface along a spherical shape. The recessed portion 18a is increased in thickness, and functions as the rib. [0024]
As described above, the surface of the upper hermetic container 12 includes the flat surface portion 17 and the curved surface portion 18. The edge portion of the flat surface portion 17, on which stress is prone to concentrate particularly, is continuous with the curved surface portion 18 through the smooth recessed portion 18 that is formed to have a large thickness. Of the upper hermetic container 12, a region other than the flat surface portion 17 is formed by the curved surface portion 18 having a shape approximate to a hemispheric shape. With this configuration, even when pressure in the hermetic container 1 rises, concentration of stress is reduced, and deformation of the upper hermetic container 12 is prevented. [0025]
The flat surface portion 17 is inclined in two directions, and the distance between the airtight terminals 16 provided on the flat surface portion 17, and the discharge pipe 4 provided on the curved surface portion 18 is extended.
Accordingly, for example, even in a case of using the discharge pipe 4 having a large diameter, specifically, the diameter of one tenth of the outer diameter of the upper hermetic container 12, the airtight terminals 16 and the discharge pipe 4 can be arranged sufficiently away from each other. [0026]
The airtight terminals 16 require the cover configured to cover the airtight terminals 16. However, in order to provide the cover, it is also required to arrange the rod 7 to which the cover is to be mounted. The flat surface portion 17 protrudes outwardly from the curved surface portion 18 of the upper hermetic container 12, and is extended to a higher position, to thereby have a large area. Accordingly, arrangement or mounting work of the airtight terminals 16 and the rod 7 is facilitated, and the cover is easily mounted to the rod 7.

[0027]
Performance Evaluation
In performance evaluation, the upper hermetic container 12 of the rotary compressor 100 according to the embodiment of the present invention and a related-art upper hermetic container were compared to each other by conducting a numerical analysis to calculate deformation amounts under application of pressure. In the upper hermetic container 12 in the embodiment of the present invention, the inclination angles of the flat surface portion 17 were set to 10 degrees with respect to the X axis of Fig. 2 and 15 degrees with respect to the Y axis of Fig. 2. In the upper hermetic container in the comparative example, the airtight terminals were provided on a flat surface without an inclination, and the discharge pipe was provided at a center of the upper hermetic container. An outer diameter and a thickness of the upper hermetic container in the comparative example were set so as to be equal to those of the upper hermetic container 12. Further, the outer diameter of the discharge pipe 4 used for the upper hermetic container 12 was one and a half times as large as the outer diameter of the discharge pipe used for the upper hermetic container in the comparative example. [0028]
Fig. 5 is a graph for showing comparison results of deformation amounts under internal pressure between the upper hermetic container 12 in the embodiment of the present invention and the related-art upper hermetic container. In Fig. 5, such a numerical analysis condition was set that pressure of 5 MPa was applied to the upper hermetic containers, and deformation amounts under application of pressure were calculated. Solid bars indicate amounts of change in the embodiment, and outlined bars indicate amounts of change in the comparative example. In comparison, deformation amounts of the upper hermetic container in the comparative example were defined as 100%. [0029]
As shown Fig. 5, a deformation amount of a portion of the upper hermetic container 12 between the discharge pipe 4 and the airtight terminals 16 is reduced to

about 50% of a deformation amount of a portion of the upper hermetic container in the comparative example between the discharge pipe and the airtight terminals. Further, a deformation amount of a portion of the upper hermetic container 12 at a center region of the airtight terminals 16 is reduced to about 80% of a deformation amount of a portion of the upper hermetic container in the comparative example at a center region of the airtight terminals. Thus, it is conceivable that the reason why the deformation amounts are reduced even when an external shape of the discharge pipe 4 is one and a half times as large as an external shape of the discharge pipe in the comparative example is because the sufficient distance is maintained between the discharge pipe 4 and the airtight terminals 16. Further, it is conceivable that the structure of the upper hermetic container 12, in which the flat surface portion 17 having the airtight terminals 16 arranged thereon, and the curved surface portion 18 having the discharge pipe 4 arranged thereon are continuous with each other through the smooth recessed portion 18a, is one of factors of reduction of the deformation amounts. Based on the above description, it has been found that, when the structure of the upper hermetic container 12 in the embodiment of the present invention is adopted, stress concentration can be alleviated, and deformation of the upper hermetic container 12 can be reduced significantly. [0030]
In the above description, the twin rotary compressor having two compression chambers is exemplified. However, the present invention is also applicable to a single rotary compressor, a scroll compressor, and compressors of other types that involves a with high flow rate of the refrigerant, so that the discharge pipe thereof may be increased in size. [0031]
Further, in the above description, a case is assumed in which the present invention is applied to a compressor of a vertical installation type. However, the present invention is also applicable to a case in which, in a compressor of a horizontal installation type, a bowl-shaped hermetic container is press-fitted into an opening portion of a cylindrical hermetic container and a discharge pipe is provided at a center

of the compressor. [0032]
According to the above-mentioned rotary compressor 100 of the embodiment of the present invention, the flat surface portion 17, on which the airtight terminals 16 are arranged, is inclined at the inclination angles θ1 and θ2 with respect to the XY plane formed by the opening of the barrel 11. With this configuration, the distance along the plane between the outermost contour 16a of the airtight terminals 16 and the side surface of the discharge pipe 4, and the distance along the plane between the outermost contour 16a of the airtight terminals 16 and the inner surface of the upper hermetic container 12 are extended. Thus, even when the outer diameter of the discharge pipe 4 is increased under a state in which a size of the outer diameter of the hermetic container 1 is maintained, strength of the hermetic container 1 can be secured. Further, a large area can be secured for the flat surface portion 17. With this configuration, arrangement, connection, and other work of the airtight terminals 16 are facilitated. [0033]
According to the above-mentioned rotary compressor 100 of the embodiment of the present invention, the inclination angles θ1 and θ2 are set to different angles. Thus, the distance between the side surface of the discharge pipe 4 and the outermost contour 16a of the airtight terminals 16, and the distance between the outermost contour 16a of the airtight terminals 16 and the inner surface of the upper hermetic container 12 can be sufficiently secured. [0034]
According to the rotary compressor 100 of the embodiment of the present invention, the one end portion 17a of the flat surface portion 17 protrudes outwardly from the curved surface portion 18, and there is an increased distance between the flat surface portion 17 and the XY plane. Thus, while the distance between the flat surface portion 17 and the discharge pipe 4 is maintained, an area of the flat surface portion 17 can be sufficiently increased, and the distance between the airtight terminals 16 and the discharge pipe 4 can be increased.

[0035]
According to the rotary compressor 100 of the embodiment of the present invention, the flat surface portion 17 and the curved surface portion 18 are continuous with each other through the smooth curve of the recessed portion 18a. Thus, strength of the hermetic container 1 is enhanced. [0036]
According to the rotary compressor 100 of the embodiment of the present invention, even when the outer diameter of the discharge pipe 4 is increased, a circulation rate of the refrigerant can be increased while strength of the hermetic container 1 is maintained. Thus, the rotary compressor 100 having a high capacity can be obtained. [0037]
According to the rotary compressor 100 of the embodiment of the present invention, each of the inclination angles θ1 and θ2 of the flat surface portion 17 is set to 5 degrees or more and 30 degrees or less. Thus, the distance between the airtight terminals 16 and the discharge pipe 4 can be increased, and an area of the flat surface portion 17 can be sufficiently increased. Further, the airtight terminals 16 can be prevented from protruding outwardly from the hermetic container 1. [0038]
According to the rotary compressor 100 of the embodiment of the present invention, for example, even when the diameter of the hermetic container is 100 mm, the distance between the side surface of the discharge pipe 4 and the airtight terminals 16 can be set to 5 mm or more, and the distance between the airtight terminals 16 and the side surface of the upper hermetic container 12 can be set to 5 mm or more. Thus, design can be made pursuant to regulations of a distance for insulation. [0039]
According to the rotary compressor 100 of the embodiment of the present invention, the rod 7 is provided on the flat surface portion 17. Thus, mounting work of the cover configured to cover the airtight terminals 16 is facilitated.

[0040]
According to the rotary compressor 100 of the embodiment of the present invention, even when refrigerant having higher saturation pressure than R22 refrigerant is compressed, the hermetic container 1 has sufficient strength. Thus, safety is maintained.
Reference Signs List [0041]
1 hermetic container 2 compression mechanism 3 electric motor 4
discharge pipe 7 rod 11 barrel 12 upper hermetic container 13
lower hermetic container 14 suction muffler 15 suction pipe 16 airtight
terminal 16a outermost contour 17 flat surface portion 17a end portion
17b end portion 18 curved surface portion 18a recessed portion 21
rotation shaft 22 main bearing 23 auxiliary bearing 24 rolling piston 25
cylinder 26 vane 31 rotator 32 stator 100 rotary compressor

CLAIMS [Claim 1]
A rotary compressor comprising a hermetic container accommodating therein a compression mechanism and an electric motor, the hermetic container including
a barrel having a cylindrical shape;
a first hermetic container to which a discharge pipe for discharging refrigerant is provided at a center portion of the first hermetic container, the first hermetic container closing an opening in one end of the barrel, and
a second hermetic container closing an opening in an other end of the barrel,
the first hermetic container including
a flat surface portion on which an airtight terminal to be connected to the electric motor is arranged, and
at least one curved surface portion, which forms a portion other than the flat surface portion,
wherein the flat surface portion is inclined at a first inclination angle with respect to a first axis on an imaginary perpendicular plane that is formed by the opening in the one end and is orthogonal to an axial direction of the barrel, such that the closer a portion of the flat surface portion is to the discharge pipe, the more away the portion is from the imaginary perpendicular plane, and
wherein the flat surface portion is inclined at a second inclination angle with respect to a second axis orthogonal to the first axis, such that the closer a portion of the flat surface portion is to the discharge pipe, the more away the portion is from the imaginary perpendicular plane.
[Claim 2]
The rotary compressor of claim 1, wherein the first inclination angle and the second inclination angle are different angles.

[Claim 3]
The rotary compressor of claim 1 or 2, wherein a distance between the imaginary perpendicular plane and a position of the flat surface portion farthest from the imaginary perpendicular plane is larger than a distance between the imaginary perpendicular plane and the at least one curved surface portion.
[Claim 4]
The rotary compressor of any one of claims 1 to 3, wherein the flat surface portion and the at least one curved surface portion are continuous with each other by a recessed portion formed in the at least one curved surface portion.
[Claim 5]
The rotary compressor of any one of claims 1 to 4, wherein the discharge pipe is formed to have an outer diameter of one tenth or more of an outer diameter of the first hermetic container.
[Claim 6]
The rotary compressor of any one of claims 1 to 5,
wherein the first inclination angle is set to 5 degrees or more and 30 degrees or less with respect to the imaginary perpendicular plane, and
wherein the second inclination angle is set to 5 degrees or more and 30 degrees or less with respect to the imaginary perpendicular plane.
[Claim 7]
The rotary compressor of any one of claims 1 to 6,
wherein a distance between a side surface of the discharge pipe and the airtight terminal is 5 mm or more, and
wherein a distance between the airtight terminal and a side surface of the second hermetic container is 5 mm or more.

[Claim 8]
The rotary compressor of any one of claims 1 to 7,
wherein the flat surface portion includes a rod provided perpendicular to the flat surface portion, and
wherein a cover configured to cover the airtight terminal is mounted to the rod.
[Claim 9]
The rotary compressor of any one of claims 1 to 8, wherein the compression mechanism is configured to compress refrigerant having higher saturation pressure than R22 refrigerant.