JP2009275566A - Hermetic compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hermetic compressor achieving reduced in noise by suppressing the vibration of a sealed vessel transmitted with the vibration of an electric element and a compression element. <P>SOLUTION: The electric element and the compression element driven by the electric element are stored in the sealed vessel 1. The sealed vessel 1 is formed of a plate-like member, and provided with a delivery pipe 14 provided at a side wall and delivering refrigerant gas compressed by the compression element. The side wall of the sealed vessel 1 in a portion sandwiching the delivery pipe 14 from both sides is formed of two recessed portions 15 locally recessed from the outside to the inside. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hermetic compressor mainly used in a refrigeration cycle such as a domestic refrigerator-freezer.

  In a general hermetic compressor used in a cooling system such as a refrigerator, an electric element and a compression element driven by the electric element are accommodated in an airtight container. Then, the crankshaft of the compression element is rotated by the rotation of the rotor of the electric element, the eccentric motion of the crankshaft is converted into horizontal motion by the connecting rod, and the piston reciprocates at the bore portion of the cylinder block. At this time, the refrigerant gas is sucked into the bore part from the cooling system by the backward movement of the piston, and the refrigerant gas sucked in this way is compressed by the forward movement of the piston and supplied to the cooling system.

As shown in the waveform diagram of the pressure level discharged from the refrigerant gas in FIG. 7, the pressure level at which the refrigerant gas is discharged during the suction and compression stroke of the refrigerant gas by the reciprocating movement of the piston is increased in a short cycle. The mechanical part including the electric element and the compression element vibrates due to the fluctuation in pressure. And the vibration of a machine part propagates to the side wall of the airtight container provided with discharge piping via a discharge line, and is radiated | emitted as the noise of an airtight compressor. As a conventional hermetic compressor capable of reducing such noise, there is one in which a concave portion having a concave shape is provided in at least one cross section of the hermetic container and a vibration damping member is fixed to the concave portion (for example, a patent) Reference 1).
JP 2006-161711 A

  However, since the conventional hermetic compressor described above is provided at the approximate center of the top surface of the sealed container that is separated from the discharge pipe that transmits the vibration of the mechanical unit to the sealed container, the discharge pipe is arranged. The noise generated on the side walls could not be reduced sufficiently.

  The present invention has been made in consideration of the above circumstances, and an object of the present invention is to realize a hermetic compressor with low noise by suppressing vibration of a hermetic container to which vibrations of an electric element and a compression element are transmitted. And

  In order to solve the above-described conventional problems, in a hermetic compressor of the present invention, an electric element and a compression element driven by the electric element are accommodated in a hermetic container, and the hermetic container is formed by a plate-like member. In addition, in the hermetic compressor provided with a discharge pipe for discharging the refrigerant gas compressed by the compression element on the side wall, locally on the side wall portion of the hermetic container where the discharge pipe is sandwiched from both sides from the outside to the inside. It is characterized by providing two recessed portions, which can increase the rigidity of the side wall of the portion where the discharge pipe is provided, and thereby the vibration of the electric element and the compression element can be transmitted. It has the effect of suppressing vibration.

  Since the hermetic compressor of the present invention has two recesses locally recessed from the outside to the inside on the side wall portion of the sealed container where the discharge pipe is sandwiched from both sides in the circumferential direction, the discharge pipe is provided. Since the rigidity of the side wall of the portion is increased and the vibration of the sealed container to which the vibration of the machine part including the electric element and the compression element is transmitted can be suppressed, it is possible to realize a hermetic compressor with low noise. it can.

  According to the first aspect of the present invention, an electric element and a compression element driven by the electric element are accommodated in an airtight container, and the airtight container is formed by a plate-like member, and a side wall by the compression element. A discharge pipe for discharging the compressed refrigerant gas is provided, and two concave portions that are locally recessed from the outside to the inside are provided on the side wall portion of the sealed container that sandwiches the discharge pipe from both sides. Since the rigidity of the side wall of the part where the discharge pipe is provided is increased and the vibration of the sealed container to which the vibration of the mechanical unit including the electric element and the compression element is transmitted can be suppressed, the hermetic compressor with low noise Can be realized.

  The invention according to claim 2 is the invention according to claim 1, wherein the two concave portions are provided on one side wall of the side wall of the hermetic container divided into approximately three equal parts in the circumferential direction. In addition to the effect of the invention according to claim 1, the rigidity of the side wall of the portion where the discharge pipe is provided is further increased in addition to the effect of the invention according to claim 1. The vibration of the sealed container to which the vibration of the mechanical part including the compression element is transmitted can be suppressed.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the electric element and the compression element are elastically accommodated in a sealed container, and two recesses are the runout of the electric element and the compression element. It is configured to function as a stopper that suppresses the amount of rotation, and can suppress noise in the discharge pipe of the sealed container due to vibration of the electric element and the compression element accompanying start and stop, and can be controlled In addition to the effects of the invention according to claim 1 or 2, the noise and vibration of the sealed container can be further suppressed, and high reliability can be ensured. Can do.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the compression element has a main shaft portion that is rotationally driven by the electric element and an eccentric shaft formed at one end of the main shaft portion. A crankshaft having a portion, a bearing portion that pivotally supports the main shaft portion, a cylinder block having a bore portion arranged at a fixed position with respect to the bearing portion, and a reciprocating motion inside the bore portion An electric element that includes an inserted piston, a connecting rod that connects the eccentric shaft portion and the piston, and a discharge line that guides refrigerant gas compressed in the bore portion to a discharge pipe. In addition, the noise of the discharge line and the discharge pipe of the sealed container due to vibration of the compression element can be suppressed, and fatigue damage of the discharge line due to run-out can be prevented. It can, in addition to the effect of the invention according to any one of claims 1 to 3, it is possible to suppress the noise and vibration of the closed container, it is possible to ensure high reliability.

  The invention according to claim 5 is the invention according to claim 4, wherein the electric element and the compression element are elastically accommodated in the sealed container, and the two recesses are formed in the horizontal direction on the side wall of the upper part of the sealed container. The cylinder block has an extending end extending to the lower portion of the recess, and at least one of the two recesses regulates the amount of upward movement of the extending end. The amount of upward movement of the electric element and the compression element immediately after starting and stopping is determined by restricting the amount of upward movement of the electric element and the compression element. In addition to the effect of the invention according to claim 4, it is possible to realize a hermetic compressor with a simplified configuration and to regulate the amount of upward movement By transporting the compressor It can be restricted amount of movement, damage to the components of the electric element and the compression element during transportation can be prevented.

  The invention according to claim 6 is the invention according to claim 5, wherein the concave portion for regulating the amount of upward movement of the extending end portion has a flat portion on the lower surface of the portion protruding into the sealed container. The extended end portion has a flat portion on the upper surface thereof, and the flat portion of the extended end portion is configured to be able to come into contact with or separate from the flat portion of the concave portion. Since it is performed by the flat part and the flat part of the extended end part, in addition to the effect of the invention of claim 5, it is possible to further suppress the generation of wear powder in the flat part that regulates the amount of movement upward. .

  According to a seventh aspect of the present invention, in the invention according to the fifth or sixth aspect, a protruding portion that protrudes between two concave portions is formed on the extending end portion of the cylinder block, and the two concave portions are By restricting the amount of movement of the protrusion in the circumferential direction, the amount of movement of the electric element and the compression element in the circumferential direction is restricted, and the elements for reducing noise are started and stopped. In addition to the effect of the invention according to claim 5 or 6, by further reducing the amount of movement of the electric element and the compression element immediately after in the circumferential direction, a hermetic compressor with a simplified configuration is provided. Can be realized.

  The invention according to claim 8 is the invention according to claim 7, wherein the two concave portions each have a second flat surface portion on the side facing the protruding portion of the extending end portion, and The protruding portion of the end portion has a second flat surface portion on the side facing the concave portion, and the second flat surface portion of the protruding portion is configured to be able to contact and separate from the second flat surface portion of the concave portion. Therefore, since the movement amount is regulated by the second flat surface portion of the concave portion and the second flat surface portion of the extending end portion, the movement amount is further increased in addition to the effect of the invention of claim 7. It is possible to suppress the generation of wear powder in the second plane portion that regulates the above.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiments.

(Embodiment 1)
1A and 1B are views showing the outer shape of a hermetic compressor according to Embodiment 1 of the present invention, where FIG. 1A is a top view, FIG. 1B is a front view, and FIG. 1C is a side view.

  FIG. 2 is a comparative view of the upper shell, and shows the upper shell of the hermetic compressor shown in FIG. 1 in comparison with conventional elements. Specifically, (a) is an external view of a conventional upper shell, and (b) is an external view of the upper shell of FIG.

  3 is a detailed configuration diagram of the hermetic compressor shown in FIG. 1, (a) is a top view showing the upper shell in cross section, (b) is a longitudinal sectional view, and (c) is the upper shell. It is the fragmentary sectional view which showed a part in section.

  First, details of the hermetic compressor will be described. As shown in FIGS. 1 to 3, an electric element 2, a compression element 3 driven by the electric element 2, and a suction muffler 4 provided in a refrigerant gas suction path of the compression element 3 are accommodated in the sealed container 1. Furthermore, the lubricating oil 5 is stored at the bottom of the sealed container 1.

  The sealed container 1 is formed by fitting a lower shell 11 formed by a plate-like member having a plate thickness of 2.9 mm or 3.2 mm and an upper shell 12 and welding them, for example. A suction pipe 13 and a discharge pipe 14 are provided through the portion 40.

  And in the airtight container 1, the recessed part 15 of two places is the upper part of the one side wall 40 of the site | part which pinched | disconnects the discharge piping 14 from the both sides of the circumferential direction, and the airtight container 1 divided into the substantially 3 equal part in the circumferential direction. It is formed side by side in the horizontal direction. These two concave portions 15 have a shape that is locally recessed from the outside to the inside, and are formed without greatly changing the plate thickness of the plate-like member by press molding.

  The electric element 2 includes a stator 21 and a rotor 22, and is attached to the bottom of the hermetic container 1 via four suspension springs 23 with its axis being substantially vertical.

  The compression element 3 includes a valve mechanism 6, a discharge chamber 7, a bore portion 31 and a bearing portion 32, and a cylinder block 33 fixed to the upper portion of the stator 21 and a reciprocating motion inserted in the bore portion 31. The piston 34 is inserted into and inserted into the axial center portion of the rotor 22 of the electric element 2, and is formed at one end thereof so as to move integrally with the main shaft portion 35 supported by the bearing portion 32 and the main shaft portion 35. A crankshaft 37 having an eccentric shaft portion 36, a connecting rod 38 for connecting the eccentric shaft portion 36 and the piston 34, and a balance weight 39 fixed to the upper end of the eccentric shaft portion 36 are provided.

  Among these components, the cylinder block 33 includes two extended end portions 33 a that extend to the lower portions of the two recessed portions 15 provided in the sealed container 1. The valve mechanism 6 is mounted on the open end of the bore portion 31, and the discharge chamber 7 is formed on the upper surface portion of the side cylinder block 33 on which the eccentric shaft portion 36 and the piston 34 are disposed. Further, the discharge chamber 7 and the discharge pipe 14 are elastically connected by a discharge line 8.

  The operation and action of the hermetic compressor configured as described above will be described below.

  The rotor 22 of the electric element 2 rotates the crankshaft 37, and the rotational movement of the eccentric shaft portion 36 is transmitted to the piston 34 via the connecting rod 38, whereby the piston 34 reciprocates in the bore portion 31. .

  By the reciprocating motion of the piston 34, the refrigerant gas is sucked into the bore portion 31 from the cooling system (not shown) through the suction pipe 13, the suction muffler 4, and the valve mechanism 6, and after being compressed, the valve mechanism 6, the discharge chamber 7 and the discharge line 8 and the discharge pipe 14 are discharged to the cooling system again.

  The lower end portion of the main shaft portion 35 has a pumping action due to the rotation of the crankshaft 37, and by this pumping action, the lubricating oil 5 at the bottom of the sealed container 1 is pumped upward, and the bearing portion 32 and the piston 34. It is supplied to the sliding part and lubricated.

  The pressure fluctuation generated by the compression operation described above, that is, the pressure fluctuation shown in the waveform diagram of FIG. 7 vibrates the discharge line 8, and the vibration of the discharge line 8 provided the discharge pipe 14 of the sealed container 1. It is transmitted to the site and generates noise.

  Further, when the compressor is started, rotational torques in opposite directions are generated between the stator 21 and the rotor 22, and the rotor 22 and the compression element 3 are caused to rotate in the rotational direction of the rotor 22 by the force. Swings in the opposite direction and then gradually attenuates while swinging alternately in the rotational direction and the counter-rotating direction, and the swinging of the rotor 22 and the compression element 3 converges.

  On the other hand, when the power of the compressor is turned off, the rotational torque between the rotor 22 and the stator 21 disappears instantaneously, but the rotor 22 continues to rotate due to the inertial force, and when the compression stroke starts, the bore portion An internal pressure is generated in 31 and the piston 34 is pushed back. By the reaction force of the piston 34, the rotation of the rotor 22 is rapidly stopped.

  As a result, the rotational energy of the rotor 22 is transmitted to the compression element 3 and the rotor 22 through the crankshaft 37, the connecting rod 38, and the piston 34 through the bore portion 31 and the like. The entire electric element 2 and compression element 3 are swung around alternately in the rotational direction and the counter-rotating direction by the energy of the swirling, and stop while being gradually damped by the spring force of the suspension spring 23.

  Thus, the vibration of the electric element 2 and the compression element 3 accompanying the start and stop of the compressor also vibrates the discharge line 8, and the vibration of the discharge line 8 is transmitted to the site where the discharge pipe 14 of the sealed container 1 is provided. Generates noise.

  In the discharge line 8 described above, a long pipe is routed so that even if one end connected to the discharge chamber 7 vibrates greatly, the other end connected to the discharge pipe 14 does not vibrate. However, since the fatigue failure of the discharge line 8 may occur if the swinging amount of the electric element 2 and the compression element 3 due to starting and stopping of the compressor is large, it is necessary to provide a means for regulating the movement amount. is there.

  Next, the details of the two recessed portions 15 provided in the sealed container 1 will be described.

  As shown in FIG. 1, the sealed container 1 is formed by fitting and welding a lower shell 11 formed of a plate-like member having substantially the same thickness and an upper shell 12. The suction pipe 13 and the discharge pipe 14 are disposed on the side wall 40 of the lower shell 11 close to the welded portion 16 between the lower shell 11 and the upper shell 12 and spaced apart in the circumferential direction.

  On the other hand, the two recessed portions 15 are provided on the side wall 40 of the upper shell 12 close to the welded portion 16 at a portion where the discharge pipe 14 is sandwiched from both sides in the circumferential direction. More specifically, assuming that the substantially central position of the sealed container 1 as viewed from above is O, a range of about 120 degrees, that is, two side walls 40 are divided into about three equal parts in the circumferential direction. A recess 15 is provided.

  In general, when a plate-like member having a relatively small thickness is used to form the upper shell 12A having no recess as shown in FIG. Since the rigidity is low, it fluctuates greatly, and the portion having a small radius of curvature has high rigidity, so that vibration is kept low.

  Therefore, it is considered that vibration and noise can be suppressed to a low level by disposing the discharge pipe 14 in a portion having a small radius of curvature. In the present embodiment, as shown in FIG. 2 (b), two recesses 15 are provided in a portion where the discharge pipe 14 is sandwiched from both sides in the circumferential direction, thereby increasing the rigidity around the discharge pipe 14. Noise. Note that FIG. 2B shows the shape of the upper shell 12 by a curve and does not actually include a streak like a curve.

  FIG. 4 is a comparison diagram of vibration characteristics. The vibration characteristics when the sealed container 1 is formed by the upper shell 12 of the present invention provided with two concave portions 15 and the conventional upper shell 12A having no concave portions are sealed containers. 6 is a characteristic diagram showing a relationship between a frequency and an inertance (a magnitude of vibration) obtained by measuring vibration characteristics when 1 is formed. FIG.

  This vibration characteristic is measured with the point P shown in FIG. 1 (c) as the excitation position and the point Q as the acceleration pickup position. In the conventional apparatus, as shown by the alternate long and short dash line, a sharp resonance occurs near 3 kHz or 5 kHz. In contrast to the peak and the antiresonance peak, in the present invention, as shown by the solid line, the resonance peak and the antiresonance peak are leveled, and the difference between the peak values is remarkably narrow.

  This is effective for reducing the noise radiated from the hermetic compressor due to the propagation of vibration to the side wall 40 of the hermetic container 1 provided with the discharge pipe 14 via the discharge line 8.

  FIG. 5 is a comparison diagram of noise characteristics. In relation to the above-described vibration characteristics, the noise of the hermetic compressor according to the present invention in which the concave portions 15 are provided at two locations and a conventional container using a hermetic container having no concave portions are illustrated. It is the characteristic view which showed the relationship between the frequency and noise level which were obtained by each detecting the noise of a hermetic compressor.

  As is clear from this figure, the difference between the two is so small as to be negligible at several hundred Hz, but it can be seen that the noise level is greatly reduced between about 1000 Hz and 4000 Hz.

  By the way, the two recessed portions 15 provided in the upper shell 12 are protrusions that locally project inside the sealed container 1. In the present invention, this protrusion is used as means for regulating the amount of movement of the machine part including the electric element 2 and the compression element 3.

  FIG. 3C is a cross-sectional view taken along the line CC of FIG. 3A, and a bottom surface region s when the two concave portions 15 are viewed from the inside of the upper shell 12 is a substantially horizontal flat portion 15a. This is because, when the two concave portions 15 provided in the upper shell 12 are formed, press forming so as not to greatly change the plate thickness of the plate-like member, so that the bottom surface region s has a substantially horizontal plane portion 15a. Is relatively easy, and the thickness of the concave portion 15 is prevented from being locally reduced, and the strength of the sealed container 1 is ensured.

  On the other hand, the cylinder block 33 has two extended end portions 33a extending to the lower portions of the two concave portions 15, and the upper surface of these extended end portions is also a flat portion (not shown). )It has become.

  Then, the two extended end portions of the cylinder block 33 are formed by making the flat portions 15a of the two concave portions 15 and the flat portions of the two extended end portions 33a face each other and appropriately setting the interval therebetween. The amount of movement that 33a moves upward can be regulated.

  As is apparent from the above description, according to the first embodiment of the present invention, the vibration of the hermetic container 1 to which the vibration of the electric element 2 and the compression element 3 is transmitted is suppressed, so that the hermetic compression with low noise is achieved. Machine can be realized.

  In addition, an element for reducing noise is used as an element that suppresses the amount of upward movement of the electric element 2 and the compression element 3 immediately after starting and stopping, thereby realizing a hermetic compressor with a simplified configuration. can do.

  Moreover, by restricting the amount of upward movement, the amount of movement of the compressor during transportation can be restricted, and it is possible to prevent damage to the components of the electric element 2 and the compression element 3 during transportation. it can.

  Further, since the movement amount is regulated by the flat portion of the recess and the flat portion of the extended end portion 33a, the generation of wear powder can be suppressed.

  In the first embodiment, both of the two concave portions 15 regulate the amount of upward movement of the two extended end portions 33a, but only one of the two concave portions 15 faces it. It is also possible to configure so as to regulate the amount of upward movement of the extending end 33a.

(Embodiment 2)
6A and 6B are detailed configuration diagrams of the hermetic compressor according to the second embodiment of the present invention. FIG. 6A is a top view showing the upper shell in section, FIG. 6B is a longitudinal sectional view, and FIG. It is the fragmentary sectional view which showed a part of shell in the cross section. In the figure, the same elements as those in FIG.

  The second embodiment differs from FIG. 3 only in that two protrusions 33b are formed on the upper surfaces of the two extended end portions 33a of the cylinder block 33, and the other configuration is the same as that of FIG. Has been.

  Here, the two protruding portions 33b are located between the two recessed portions 15, and the two extended end portions of the cylinder block 33 are set by setting the interval between the recessed portion 15 and the protruding portion 33b to an appropriate value. The amount of movement of 33a in the circumferential direction can be regulated.

  In this case, the two recesses 15 each have a flat surface (not shown) on the side facing the two protrusions 33 b, and the two protrusions 33 b are also on the side facing the two recesses 15. It has a plane part (not shown). And it is comprised so that these plane parts may contact / separate.

  In forming the plate-like member in these two concave portions 15, by pressing so that the plate thickness of the plate-like member is not greatly changed, a plane portion is formed on the side facing the two protruding portions 33b. In addition to being relatively easy to form, the thickness of the concave portion 15 is prevented from being locally reduced, and the strength of the sealed container 1 is ensured.

  As is apparent from the above description, according to the second embodiment of the present invention, the hermetic compression with low noise is suppressed by suppressing the vibration of the hermetic container 1 to which the vibration of the electric element 2 and the compression element 3 is transmitted. Machine can be realized.

  Further, the configuration is simplified by using the elements for reducing noise as elements that suppress the upward movement amount and the circumferential movement amount of the electric element 2 and the compression element 3 immediately after starting and stopping. A closed type compressor can be realized.

  Moreover, since the amount of movement in the upward direction and the amount of movement in the circumferential direction are regulated, the amount of movement during the transportation of the compressor can be regulated, and the components of the electric element 2 and the compression element 3 during the transportation are damaged. Can be prevented in advance.

  In the second embodiment, two concave portions are formed at a portion where the discharge pipe 14 is sandwiched from both sides in the horizontal direction with the closed container 1 formed by fitting the upper shell 12 and the lower shell 11 and welding them. 15 is formed, but if the sealed container is spherical, it is the same as described above by forming a recess in the portion where the discharge pipe is sandwiched from both sides, whether in the vertical direction or in the oblique direction. Noise reduction effect can be obtained.

  Moreover, although each said embodiment demonstrated the reciprocating type hermetic type compressor, this invention is not limited to this, It drives with an electric element and an electric element in an airtight container. If a hermetic compressor is housed in a turbo-type, the airtight container is formed of a plate-like member and has a discharge pipe for discharging refrigerant gas compressed by the compression element on the side wall. The present invention can be applied to any of a screw type, a rotary type, and a scroll type.

  According to the present invention, two concave portions that are locally recessed from the outside to the inside while maintaining the plate thickness of the plate-like member are provided on the side wall portion of the sealed container where the discharge pipe is sandwiched from both sides in the circumferential direction. Therefore, the rigidity of the side wall of the part where the discharge pipe is provided can be increased to suppress the vibration of the sealed container to which the vibration of the mechanical part including the electric element and the compression element is transmitted. It is useful to realize the machine. Further, since the two concave portions also serve as means for regulating the movement amounts of the electric element and the compression element, it is useful for realizing a hermetic compressor with a simplified configuration.

(A) Top view showing the outer shape of the hermetic compressor in Embodiment 1 of the present invention (b) Front view showing the outer shape of the hermetic compressor (c) Outer shape of the hermetic compressor Side view showing (A) External view of conventional upper shell (b) External view of upper shell in Embodiment 1 of the present invention (A) Top view showing the upper shell of the hermetic compressor shown in FIG. 1 in section (b) Longitudinal sectional view of the hermetic compressor (c) Cross section of a part of the upper shell of the hermetic compressor Partial cross section shown in Comparison of vibration characteristics in the same embodiment Comparison of noise characteristics in the same embodiment (A) Top view showing in cross section the upper shell of the hermetic compressor in Embodiment 2 of the present invention (b) Longitudinal sectional view of the hermetic compressor (c) Part of the upper shell of the hermetic compressor Partial sectional view showing the cross section Waveform diagram of pressure level for discharging refrigerant gas in a conventional hermetic compressor

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Electric element 3 Compression element 8 Discharge line 14 Discharge piping 15 Recessed part 31 Bore part 32 Bearing part 33 Cylinder block 33a Extension end part 33b Protrusion part 34 Piston 35 Main shaft part 36 Eccentric shaft part 37 Crankshaft 38 Connecting rod 40 Side wall (Part)

Claims (8)

  An electric element and a compression element driven by the electric element are accommodated in the airtight container. The airtight container is formed by a plate-like member and discharges the refrigerant gas compressed by the compression element to the side wall. A hermetic compressor having two concave portions locally recessed from the outside to the inside on a side wall portion of the hermetic container at a portion sandwiching the discharge pipe from both sides.   2. The hermetic compressor according to claim 1, wherein the two concave portions are provided on one of the side walls of the hermetic container divided into approximately three equal parts in the circumferential direction.   The electric element and the compression element are elastically accommodated in the sealed container, and the two recesses are configured to function as a stopper that suppresses the amount of swinging of the electric element and the compression element. The hermetic compressor described in 1.   A compression element is a main shaft portion that is rotationally driven by an electric element, a crankshaft having an eccentric shaft portion formed at one end of the main shaft portion, a bearing portion that pivotally supports the main shaft portion, and the bearing portion. A cylinder block having a bore portion disposed at a fixed position; a piston inserted in the bore portion so as to be reciprocally movable; a connecting rod connecting the eccentric shaft portion and the piston; and the bore portion. The hermetic compressor according to any one of claims 1 to 3, further comprising a discharge line that guides the compressed refrigerant gas to a discharge pipe.   The electric element and the compression element are elastically accommodated in the sealed container, and the two concave portions are provided in the horizontal direction on the side wall of the upper portion of the sealed container, and the cylinder block extends to the lower portion of the concave portion. It has an end part, and at least one of the two concave portions regulates the upward movement amount of the electric element and the compression element by restricting the upward movement amount of the extended end part. The hermetic compressor according to claim 4, wherein the hermetic compressor is configured as described above.   The concave portion that regulates the upward movement amount of the extended end portion has a flat portion on the lower surface of the portion protruding into the sealed container, and the extended end portion has a flat portion on the upper surface, The hermetic compressor according to claim 5, wherein the flat portion of the extending end portion is configured to be able to contact and separate from the flat portion of the concave portion.   Protruding portions that protrude between the two concave portions are formed on the extending end of the cylinder block, and the two concave portions regulate the amount of movement of the protruding portions in the circumferential direction, so that the electric element and the compression 7. The hermetic compressor according to claim 5, wherein the amount of movement of the element in the circumferential direction is restricted.   The two concave portions each have a second flat portion on the side facing the protruding portion of the extending end portion, and the second protruding portion on the side where the protruding portion of the extending end portion faces the concave portion. 8. The hermetic compressor according to claim 7, wherein the hermetic compressor has a flat portion, and the second flat portion of the projecting portion can be brought into contact with and separated from the second flat portion of the concave portion.