Vibration damping device and hermetic compressor using the same

Abstract

To provide a damping device that can be applied not only to a field of a hermetic compressor but also to other fields, and can achieve an excellent vibration damping effect, and to provide a hermetic compressor using the damping device.SOLUTION: A damping device 18 includes: a plate-like elastic member 17 having elasticity that can be deformed so as to abut against a structure surface (e.g., an upper closed vessel 1a of a hermetic compressor) where vibration is generated; and a holding member 16 for causing the elastic member 17 to abut against the structure surface and holding the elastic member. The holding member 16 is partially fixed with a predetermined interval with the structure surface. A Young's modulus of the elastic member 17 is within a range of 100,000-300,000 N / mm2. The elastic member 17 abuts against the structure surface without being fixed in the state of being held between the holding member 16 and the structure surface.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a vibration damping device capable of reducing, alleviating, or suppressing vibration of a structure in a device including the structure, and a hermetic compressor which is a representative example of a device using the vibration damping device.

Background Art

[0002] Conventionally, when vibration occurs during the operation of a device, techniques for reducing, alleviating, or suppressing the vibration (vibration damping techniques) have been studied. In particular, when vibration propagates from a vibration source causing the vibration to a specific object (structure), when the frequency of the vibration from the vibration source overlaps with the resonance frequency of the object to be propagated, a large amount of noise is generated. Therefore, reducing, alleviating, or suppressing vibration (vibration damping action) can also be a noise countermeasure.

[0003] Examples of devices that generate vibration include, for example, hermetic compressors. In a general hermetic compressor, a compression mechanism such as a reciprocating type, a rotary type, or a scroll type is housed inside a sealed container. A compression operation is performed in which a refrigerant is sucked, compressed, and discharged by the compression mechanism.

[0004] During this compression operation, pulsation occurs, and the pulsation propagates to the sealed container through the refrigerant gas or lubricating oil present in the sealed container, and the sealed container is excited to generate vibration. The frequency of this vibration depends on the operating rotational speed of the compression mechanism. At the same time as the compression operation, noise such as knocking sound is also generated from the suction / discharge valves provided in the compression mechanism. This noise is also transmitted to the sealed container through the solid contact portion of the compression mechanism and becomes vibration.

[0005] As described above, when the frequencies of these vibrations overlap with the resonance frequency of an object (structure) such as a sealed container, a large amount of noise is generated. In addition, noise such as knocking sound is a harmonic wave that enters the audible range of humans, but when such harmonic sound (vibration) is transmitted to the sealed container, it may vibrate the sealed container and lead to the generation of further noise.

[0006] Therefore, in the field of hermetic compressors, conventionally, a method of suppressing the noise of hermetic compressors by adopting a configuration having a vibration damping effect has been proposed. For example, Patent Document 1 discloses a method of directly fixing an elastic member to the hermetic container of a hermetic compressor. Further, Patent Document 2 discloses a method of using a vibration damping member having a contact portion that elastically contacts the surface of the hermetic container.

[0007] In the method disclosed in Patent Document 1, an elastic member is fixed to the inner surface of the hermetic container and the elastic member is elastically contacted, whereby a contact friction damping effect in a relatively wide frequency band can be obtained. In the hermetic compressor disclosed in Patent Document 1, as shown in FIG. 12, a vibration damping plate 102 having a plurality of contact portions 104a to 104f is welded and fixed to a hermetic container 101 by a fixing portion 103. This vibration damping plate 102 corresponds to the elastic member.

[0008] However, as described in Patent Document 2, in the method of fixing and elastically contacting an elastic member (vibration damping plate 102) to a structure (hermetic container 101) as disclosed in Patent Document 1, a sufficient noise prevention effect may not be obtained.

[0009] Therefore, in the hermetic compressor disclosed in Patent Document 2, as shown in FIGS. 13A and 13B, a vibration damping member 202 having a fixing portion 204 which is a part fixed to a hermetic container 201, a free end 203 which is the other part, and a connecting portion 206 connecting the fixing portion 204 and the free end 203 is used.

[0010] This vibration damping member 202 includes a plurality of contact portions 205a to 205d in which a part other than the free end 203 elastically contacts the surface of the hermetic container 201. Thereby, since the natural frequency of the free end 203 of the vibration damping member 202 can be substantially matched with the natural frequency of the hermetic container 201, a good vibration damping effect can be realized. In FIGS. 13A and 13B, a configuration in which the vibration damping member 202 is provided on the bottom surface of the hermetic container 201 is illustrated, and the vibration damping member 202 is in a state of being immersed in lubricating oil 207.

Prior Art Documents

Patent Documents

[0011]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0012] However, the vibration damping member 202 disclosed in Patent Document 2 is specialized for application to a hermetic compressor. Therefore, its configuration is relatively complicated, such as having a plurality of contact portions 205a to 205d or having a free end 203 via a connecting portion 206. Therefore, there is a demand for a vibration damping device having a simple configuration that can be applied not only to the field of hermetic compressors but also to other fields.

[0013] The present invention has been made to solve such problems, and an object thereof is to provide a vibration damping device that can be applied not only to the field of hermetic compressors but also to other fields and can realize a good vibration damping effect, and a hermetic compressor using the vibration damping device.

Means for Solving the Problems

[0014] The vibration damping device according to the present invention includes, in order to solve the above problems, an elastic plate-like elastic member that can be deformed so as to contact the surface of a structure where vibration occurs, and a holding member that holds the elastic member in contact with the surface of the structure. The holding member is partially fixed with a predetermined interval from the surface of the structure, and the elastic member is configured to be in contact with the surface of the structure without being fixed while being held between the holding member and the surface of the structure.

[0015] According to the above configuration, a plate-shaped elastic member is held by a holding member so as to contact the surface of the structure, but the elastic member is not fixed to the surface of the structure and comes into contact with the structure. As a result, the elastic member is maintained in a state of being in contact with the vibrating structure without being fixed. As a result, even if vibration occurs in the structure, the vibration is favorably suppressed or alleviated by the elastic action of the elastic member.

[0016] Further, the elastic member is held between itself and a holding member that is partially fixed to the surface of the structure and is in contact with the surface of the structure. Therefore, it is possible to realize a vibration damping device with a simple configuration without the need to adopt a complicated configuration.

[0017] Furthermore, the contact property of the elastic member with the surface of the structure depends on the elasticity of the elastic member, and the contact range of the elastic member with the surface of the structure depends on the area of the elastic member. Since the elastic member is a plate member having elasticity, it is possible to easily adjust the contact property or the contact range of the elastic member. As a result, it is possible to easily realize vibration damping performance corresponding to the vibration generated in the structure.

[0018] In addition, in order to solve the above problems, the hermetic compressor according to the present invention includes a hermetic container, an electric element including a stator and a rotor, and a compression element that compresses a fluid driven by the electric element. The electric element and the compression element are housed in the hermetic container, lubricating oil is stored in the hermetic container, and further, a vibration damping device attached to the inner surface of the hermetic container is provided. The vibration damping device includes an elastic plate-shaped elastic member that is deformable so as to contact the inner surface of the hermetic container, and a holding member that holds the elastic member in close contact with the inner surface of the hermetic container. The holding member is partially fixed with a gap of a predetermined distance between itself and the inner surface of the hermetic container, and the elastic member is configured to be in contact with the surface of the structure without being fixed while being held between the holding member and the inner surface of the hermetic container.

[0019] According to the above configuration, a vibration damping device having a configuration in which a plate-shaped elastic member is held by a holding member so as to be in contact with the sealed container without being fixed to the sealed container is provided. Thereby, the vibration of the sealed container can be reduced, alleviated or suppressed (vibration-damped), and the noise caused by the vibration can also be reduced.

[0020] Furthermore, the vibration damping device provided in the hermetic compressor can also exhibit a friction damping effect against the three-dimensional vibration of the sealed container. Therefore, the peaks of a plurality of resonance frequencies of the sealed container can be attenuated. Therefore, for example, if the hermetic compressor is of the reciprocating type, the noise in the resonance frequency band of the harmonic waves peculiar to the reciprocating type can be reliably reduced.

[0021] The above object, other objects, features, and advantages of the present invention will become apparent from the following detailed description of the preferred embodiments with reference to the accompanying drawings.

Effect of the Invention

[0022] In the present invention, with the above configuration, it is possible to provide a vibration damping device applicable not only to the field of hermetic compressors but also to other fields and capable of realizing a good vibration damping effect, and a hermetic compressor using the vibration damping device, and thus has the effect of being able to achieve this.

Brief Description of the Drawings

[0023]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Embodiments for Carrying Out the Invention

[0024] The vibration damping device according to the present disclosure includes an elastic plate-like elastic member that can be deformed to abut against the surface of a vibrating structure, and a holding member that holds the elastic member in contact with the surface of the structure. The holding member is partially fixed with a predetermined interval from the surface of the structure, and the elastic member is configured to abut against the surface of the structure without being fixed thereto while being held between the holding member and the surface of the structure.

[0025] According to the above configuration, the plate-like elastic member is held by the holding member so as to abut against the surface of the structure, but the elastic member is not fixed to the surface of the structure and abuts against the structure. As a result, the elastic member is maintained in a state of being in contact with the vibrating structure without being fixed. As a result, even if vibration occurs in the structure, the vibration is favorably suppressed or mitigated by the elastic action of the elastic member.

[0026] Further, the elastic member is held between the holding member that is partially fixed to the surface of the structure and abuts against the surface of the structure. Therefore, it is possible to realize a vibration damping device with a simple configuration without adopting a complicated configuration.

[0027] Furthermore, the contact property of the elastic member with the surface of the structure depends on the elasticity of the elastic member, and the contact range of the elastic member with the surface of the structure depends on the area of the elastic member. Since the elastic member is an elastic plate member, it is possible to easily adjust the contact property or the contact range of the elastic member. As a result, it is possible to easily realize vibration damping performance corresponding to the vibration generated in the structure.

[0028] In the vibration damping device having the above configuration, the surface of the structure may be curved, and the holding member may include a portion having a curvature corresponding to the curvature of the surface of the structure.

[0029] Also, in the vibration damping device having the above configuration, the shape of the corner or the longitudinal end of the plate-like elastic member may be a convex curved shape.

[0030] Further, in the vibration damping device having the above configuration, a plurality of protrusions may be provided on the non-contact surface, which is the surface on the side of the elastic member that does not contact the surface of the structure, among both surfaces of the elastic member, and holes may be provided in the holding member at positions corresponding to the plurality of protrusions.

[0031] Further, in the vibration damping device having the above configuration, the holding member may be configured such that the portion holding the elastic member is plate-shaped and its thickness is larger than the thickness of the elastic member.

[0032] Further, in the vibration damping device having the above configuration, the holding member may be configured to hold the elastic member in a state of being biased toward the surface of the structure.

[0033] Further, in the vibration damping device having the above configuration, the elastic member may be made of metal and may be subjected to quenching treatment.

[0034] Further, in the vibration damping device having the above configuration, the structure may be a sealed container provided in a hermetic compressor, and the inner surface of the sealed container may be the surface of the structure.

[0035] Further, the hermetic compressor according to the present disclosure includes a sealed container, an electric element including a stator and a rotor, and a compression element that compresses a fluid driven by the electric element. The electric element and the compression element are housed in the sealed container, lubricating oil is stored in the sealed container, and further includes a vibration damping device attached to the inner surface of the sealed container. The vibration damping device includes an elastic plate-shaped elastic member that can be deformed to contact the inner surface of the sealed container, and a holding member that holds the elastic member in close contact with the inner surface of the sealed container. The holding member is partially fixed with a gap of a predetermined interval between it and the inner surface of the sealed container, and the elastic member is in contact with the surface of the structure without being fixed while being held between the holding member and the inner surface of the sealed container.

[0036] According to the above configuration, a vibration damping device is provided with a holding member that holds a plate-shaped elastic member in contact with a sealed container without fixing it. As a result, the vibration of the sealed container can be reduced, alleviated, or suppressed (vibration damping), and the noise caused by vibration can also be reduced.

[0037] Furthermore, the vibration damping device provided in the hermetic compressor can also exhibit a friction damping effect against the three-dimensional vibration of the sealed container. Therefore, the peaks of multiple resonance frequencies of the sealed container can be attenuated. Thus, for example, if the hermetic compressor is of the reciprocating type, the noise in the resonance frequency band of the harmonics peculiar to the reciprocating type can be reliably reduced.

[0038] In the hermetic compressor having the above configuration, the vibration damping device may be attached to at least one of the upper inner surface and the lower inner surface inside the sealed container.

[0039] Hereinafter, typical embodiments of the present disclosure will be described with reference to the drawings. In the following, the same or corresponding elements are denoted by the same reference numerals throughout all the drawings, and the overlapping descriptions thereof are omitted.

[0040] [Configuration Example of Hermetic Compressor] First, a typical configuration example of the hermetic compressor according to the embodiment of the present disclosure will be specifically described with reference to FIG. 1. FIG. 1 is a cross-sectional view showing a configuration example of the hermetic compressor according to a typical embodiment of the present disclosure.

[0041] As shown in FIG. 1, the hermetic compressor has a configuration in which an electric element 2 and a compression element 3 are housed in a sealed container 1. The compressor main body 4 is constituted by the electric element 2 and the compression element 3. In the hermetic compressor, the sealed container 1 is filled with a refrigerant gas 6, which is, for example, R600a in this embodiment, and mineral oil, for example, is stored as lubricating oil 7 at the bottom. Further, the compressor main body 4 housed in the sealed container 1 is elastically supported by a suspension spring 5.

[0042] The sealed container 1 is composed of an upper sealed container 1a and a lower sealed container 1b. A spring receiving part 5a is provided in the lower sealed container 1b, and a suspension spring 5 is attached to this spring receiving part 5a, and the compressor main body 4 is supported by this suspension spring 5. The sealed container 1 (the upper sealed container 1a and the lower sealed container 1b) is formed by, for example, deep drawing of an iron plate in this embodiment.

[0043] The sealed container 1 is provided with a suction pipe 8 and a discharge pipe 9. One end of the suction pipe 8 communicates with the inside of the sealed container 1, and the other end is connected to the low-pressure side (not shown) of the refrigeration device. One end of the discharge pipe 9 penetrates the sealed container 1 and communicates with a discharge muffler (not shown) from the compression element 3, and the other end is connected to the high-pressure side (not shown) of the refrigeration device.

[0044] The electric element 2 is at least composed of a rotor 14 and a stator 15. The stator 15 is arranged on the outer diameter side of the rotor 14 so as to maintain a substantially constant gap from the rotor 14. In this embodiment, the electric element 2 is driven at a plurality of operating frequencies including an operating frequency (for example, 75 Hz = 4,500 r / min) higher than the commercial power supply frequency by, for example, an inverter drive circuit. Therefore, the hermetic compressor according to this embodiment may be provided with an inverter circuit so that the electric element 2 can be rotationally driven at a plurality of operating speeds.

[0045] The compression element 3 has a reciprocating configuration driven by the electric element 2, and includes a shaft (crankshaft) 10, a cylinder block 11, a piston 12, a connecting part 13, etc. The shaft 10 is at least composed of a main shaft, an eccentric shaft formed eccentrically with respect to this main shaft, and a flange part connecting the main shaft and the eccentric shaft. The stator 15 is fixed to the leg part of the cylinder block 11, and the rotor 14 is fixed to the main shaft of the shaft 10 by, for example, shrink fitting.

[0046] As shown in Fig. 1, the eccentric shaft of the shaft 10 is located above the hermetic compressor, and the main shaft is located below the hermetic compressor. Therefore, this vertical positional relationship (direction) is also utilized when explaining the position of the shaft 10. For example, the upper end of the eccentric shaft faces the inner upper surface of the hermetic container 1 (upper hermetic container 1a), and the lower end of the eccentric shaft is connected to the main shaft.

[0047] The upper end of the main shaft is connected to the eccentric shaft. The lower end of the main shaft faces the inner lower surface of the hermetic container 1 (lower hermetic container 1b), and the lower end portion of the main shaft is immersed in the lubricating oil 7. Also, a lubricating oil supply mechanism is provided below the shaft 10, that is, below the main shaft. The lubricating oil supply mechanism supplies the lubricating oil 7 from the lower end of the main shaft immersed in the lubricating oil 7 to the upper end of the eccentric shaft.

[0048] The cylinder block 11 is integrally formed with a cylinder that forms a compression chamber and a main bearing that rotatably supports the main shaft of the shaft 10. The main bearing is formed in a tubular (cylindrical) shape that extends in the vertical direction with respect to the cylinder block 11, and its inner peripheral surface is a sliding surface. Also, the main bearing includes a thrust surface and a tubular extension portion.

[0049] The thrust surface is a flat surface that extends in a direction (a direction perpendicular to the axis, that is, the vertical direction, the horizontal direction) orthogonal to the axis of the shaft, that is, the extending direction (vertical direction) of the main shaft. The tubular extension portion is tubular (cylindrical) and extends further upward from the thrust surface. In other words, it is a portion that extends upward from the tubular main bearing body. Therefore, the tubular extension portion, together with the main bearing body, has an inner peripheral surface (sliding surface) that faces the outer peripheral surface (sliding surface) of the main shaft. A thrust ball bearing is provided on the thrust surface of the main bearing.

[0050] In this embodiment, the cylinder block 11 is made of, for example, cast iron. The compression chamber is a cylindrical (columnar) bore formed in the cylinder block 11, and the piston 12 is reciprocally inserted into this compression chamber. Therefore, the compression chamber is closed by the insertion of the piston 12. In this embodiment, the connecting portion 13 is made of, for example, an aluminum casting, supports the eccentric shaft of the shaft 10, and is connected to the piston 12. Therefore, the eccentric shaft of the shaft 10 and the piston 12 are connected by the connecting portion 13.

[0051] Furthermore, in this embodiment, vibration damping devices 18 and 19 are provided which are attached to the inner surface of the hermetic container 1 of the hermetic compressor. In FIG. 1, an upper vibration damping device 18 is provided on the inner surface (the upper inner surface of the hermetic container 1) of the upper hermetic container 1a of the hermetic container 1, and a lower vibration damping device 19 is provided on the inner surface (the lower inner surface of the hermetic container 1) of the lower hermetic container 1b. Note that these vibration damping devices 18 and 19 will be described later.

[0052] In this embodiment, in the hermetic container 1, the electric element 2 is located on the upper side and the compression element 3 is located on the lower side. However, the configuration of the hermetic compressor according to the present disclosure is not limited to this, and the electric element 2 may be located on the lower side and the compression element 3 may be located on the upper side. Also, in this embodiment, the electric element 2 is of the inner rotor type, and the rotor 14 is coaxially arranged with the stator 15 and is rotatably disposed inside the inner periphery of the stator 15. However, the configuration of the electric element 2 is not limited to this, and it may be of the outer rotor type, that is, the rotor 14 may be coaxially arranged with the stator 15 and rotatably disposed on the outer periphery of the stator 15. Also, in this embodiment, as shown in FIG. 1, the compression element 3 is of the reciprocating type, but the present disclosure is not limited to this, and it may be of, for example, the rotary type.

[0053] Also, in this embodiment, the compression element 3 driven by the electric element 2 in the hermetic compressor compresses the refrigerant gas 6 filled in the hermetic container 1, but the hermetic compressor according to the present disclosure is not limited to compressing the refrigerant gas 6, and it may compress a known fluid other than the refrigerant gas 6.

[0054] In the present embodiment, a hermetic compressor configured as described above is connected to, for example, a known refrigeration apparatus to form a refrigerant circuit. The refrigerant circuit includes a hermetic compressor, a radiator, a decompression device, and an absorber, and an example of its configuration is a circular connection of these components by piping.

[0055] To operate the hermetic compressor, first, power is supplied from a commercial power source (not shown) to the electric element 2. Thereby, the rotor 14 of the electric element 2 is rotated. The rotor 14 rotates the shaft 10, and the eccentric motion of the eccentric shaft of the shaft 10 is transmitted to the piston 12 via the connecting portion 13, thereby driving the piston 12 to reciprocate in the compression chamber. The piston 12 performs a predetermined compression operation of sucking the refrigerant gas 6 introduced into the hermetic container 1 into the compression chamber and compressing it.

[0056] Specifically, due to the reciprocating motion of the piston 12, the refrigerant gas 6, which is the working fluid in the refrigeration apparatus, is sucked into the hermetic container 1 through the suction pipe 8. The refrigerant gas 6 in the hermetic container 1 is sucked into the compression chamber through the suction valve and compressed, and then discharged from the discharge pipe 9 to the high-pressure side of the refrigeration apparatus through the discharge valve and the discharge muffler.

[0057] At this time, in the hermetic compressor, pulsation occurs in the flow of the refrigerant gas 6 due to the compression operation. As a result, the compressor body 4 elastically supported by the suspension spring 5 on the hermetic container 1 also pulsates. Further, the pulsation of the compressor body 4 is excited by other vibrations. Along with this, the hermetic container 1 is excited and vibrates. When the hermetic container 1 vibrates in this way, noise is generated.

[0058] Therefore, in the present embodiment, as described above, vibration reduction devices 18 and 19 are provided for the hermetic container 1 to reduce, mitigate, or suppress (vibration-dampen) the vibration of the hermetic container 1.

[0059] Note that the specific driving method of the hermetic compressor is not limited to the inverter drive described above. For example, the hermetic compressor may be driven by simple on-off control. Also, when the hermetic compressor is inverter-driven by an inverter circuit, its operating frequency is not particularly limited. Furthermore, the operating rotational speed of the electric element 2 is not particularly limited, but generally, for example, it can be within the range of 17 to 75 rps (revolutions per second or rotations per second). The upper limit of the operating rotational speed may be 80 rps, and the lower limit of the operating rotational speed may be 13 rps.

[0060] [Configuration Example of Vibration Isolation Device] Next, an example of applying the vibration isolation device according to the present disclosure to a hermetic compressor will be specifically described with reference to FIGS. 2 to 6. FIG. 2 is a plan view showing the ceiling surface of the hermetic container 1, that is, the inner surface side of the upper hermetic container 1a. FIG. 3 is a partial cross-sectional view showing a typical configuration example of the vibration isolation device according to the present disclosure provided on the inner surface (ceiling surface) of the upper hermetic container 1a. FIG. 4 is a plan view showing the bottom surface of the hermetic container 1, that is, the inner surface side of the lower hermetic container 1b. FIG. 5 is a partial cross-sectional view showing a typical configuration example of the vibration isolation device according to the present disclosure provided on the inner surface (bottom surface) of the lower hermetic container 1b.

[0061] As shown in FIG. 2, an upper vibration isolation device 18 including a holding member 16 and an elastic member 17 is provided on the inner surface, that is, the ceiling surface (top surface), of the upper hermetic container 1a. As will be described later, the holding member 16 holds the plate-shaped elastic member 17 in contact with the surface of the upper hermetic container 1a (structural body). Therefore, in the example shown in FIG. 2, the holding member 16 has a plate-shaped configuration capable of covering the entire elastic member 17. Therefore, in FIG. 2, the holding member 16 is illustrated by a solid line, and the elastic member 17 covered by the holding member 16 is illustrated by a dotted line.

[0062] In the present embodiment, the holding member 16 has two positioning holes 16a and two fixing portions 16b. The holding member 16 is configured as a plate member having a longitudinal direction, with fixing portions 16b provided at both ends thereof, and two positioning holes 16a are formed side by side along the longitudinal direction near the central portion in the longitudinal direction.

[0063] Similar to the holding member 16, the elastic member 17 is also configured as a plate member having a longitudinal direction. In the present embodiment, since the elastic member 17 is entirely covered by the holding member 16, the spreading area of the elastic member 17 is smaller than the spreading area of the holding member 16. At the central portion in the longitudinal direction of the elastic member 17, two positioning protrusions 17a are provided along the longitudinal direction. The positions of the positioning protrusions 17a of the elastic member 17 correspond to the positions of the positioning holes 16a of the holding member 16.

[0064] As shown in FIG. 3, one surface (first surface) of the elastic member 17, which is a plate member, abuts against the upper sealed container 1a. The other surface (second surface, the back surface of the first surface) of the elastic member 17 is supported or biased by the holding member 16 so that the first surface of the elastic member 17 is held in contact with the upper sealed container 1a. Therefore, the first surface of the elastic member 17 is defined as the "contact surface" that contacts the upper sealed container 1a, that is, the surface of the structure where vibration occurs, and the second surface of the elastic member 17, that is, the surface on the side that does not contact the upper sealed container 1a, is defined as the "non-contact surface" that does not contact the structure. The positioning protrusions 17a are provided on the non-contact surface (second surface) of the elastic member 17.

[0065] The holding member 16 has rigidity, different from the elastic member 17 having elasticity, in order to hold the elastic member 17 so that the contact surface (first surface) of the elastic member 17 abuts against the upper sealed container 1a (structure).

[0066] In the present embodiment, the structure where vibration occurs is the sealed container 1. As shown in FIG. 1 or FIG. 3, the ceiling surface (structure surface) of the sealed container 1 (upper sealed container 1a) is curved convex upward. Therefore, the holding member 16 is also curved along the curvature of the ceiling surface.

[0067] One surface (first surface) of the holding member 16 which is a plate member contacts the elastic member 17 and holds the elastic member 17 in contact with the upper sealed container 1a (structure). Therefore, the first surface of the holding member 16 is regarded as a "holding surface" for holding the elastic member 17, and the second surface of the holding member 16, that is, the back surface of the holding surface, is regarded as a "non-holding surface" that does not hold the elastic member 17. The fixing portions 16b provided at both ends of the holding member 16 are portions for fixing the holding member 16 to the upper sealed container 1a, and in the present embodiment, they are formed as protrusions protruding toward the holding surface side.

[0068] In order to interpose the elastic member 17 between the holding member 16 and the surface of the upper sealed container 1a (structure), the holding member 16 has a predetermined interval from the upper sealed container 1a (structure) and is partially fixed to the upper sealed container 1a by the fixing portion 16b. In the present embodiment, the fixing portion 16b is welded to the inner surface of the upper sealed container 1a.

[0069] The positioning hole 16a of the holding member 16 is formed at a position corresponding to the positioning protrusion 17a of the elastic member 17. Thereby, since the positioning protrusion 17a enters the positioning hole 16a, the elastic member 17 is positioned with respect to the holding member 16. Although the holding member 16 is fixed to the upper sealed container 1a, the elastic member 17 is only positioned by the holding member 16. Therefore, the elastic member 17 can contact the upper sealed container 1a in a positioned state without being fixed to the upper sealed container 1a.

[0070] As shown in FIG. 3, in the upper vibration damping device 18 according to the present embodiment, the elastic member 17 which is a flat plate (plate member) is sandwiched between the upper sealed container 1a (structure) and the holding member 16. The holding member 16 has a holding surface that substantially conforms to the curvature of the upper sealed container 1a, and is fixed to the upper sealed container 1a so that a gap with a predetermined interval is formed between the holding member 16 and the inner surface (ceiling surface) of the upper sealed container 1a.

[0071] As shown in FIG. 1, the hermetic compressor according to the present embodiment includes an upper vibration damping device 18 on the ceiling surface (the inner surface of the upper hermetic container 1a) of the hermetic container 1 and a lower vibration damping device 19 on the bottom surface (the inner surface of the lower hermetic container 1b) of the hermetic container 1.

[0072] As shown in FIG. 4, a lower vibration damping device 19 including a holding member 16 and an elastic member 17 is provided on the inner surface, that is, the bottom surface, of the lower hermetic container 1b. In the present embodiment, since the lower vibration damping device 19 has the same configuration as the upper vibration damping device 18, in FIG. 4, the holding member 16 is shown by a solid line, and the elastic member 17 covered by the holding member 16 is shown by a dotted line.

[0073] Since a suspension spring 5 for supporting the compressor body 4 is attached to the lower hermetic container 1b, for example, as shown in FIG. 4, four spring receiving portions 5a are provided at positions corresponding to the four corners of a square region corresponding to the compressor body 4. Therefore, the lower vibration damping device 19 is attached at a position inside the square region so as not to overlap the position of the spring receiving portion 5a. Also, as shown in FIG. 1, lubricating oil 7 is stored in the lower hermetic container 1b, and an intake pipe 8, a discharge pipe 9, etc. are provided as also shown in FIG. 4.

[0074] Also in the lower vibration damping device 19, similar to the upper vibration damping device 18, the holding member 16 has two positioning holes 16a and two fixing portions 16b. The holding member 16 is configured as a plate member having a longitudinal direction, and fixing portions 16b are provided at both ends thereof, and two positioning holes 16a are formed side by side along the longitudinal direction near the central portion in the longitudinal direction.

[0075] The elastic member 17 is also configured as a plate member having a longitudinal direction, similar to the holding member 16. In the present embodiment, since the elastic member 17 is entirely covered by the holding member 16, the spreading area of the elastic member 17 is smaller than the spreading area of the holding member 16. At the central portion in the longitudinal direction of the elastic member 17, two positioning protrusions 17a are provided along the longitudinal direction. The positions of the positioning protrusions 17a of the elastic member 17 and the positions of the positioning holes 16a of the holding member 16 correspond to each other.

[0076] As shown in FIG. 5, also in the lower vibration damping device 19, the contact surface (first surface) of the elastic member 17 abuts against the lower sealed container 1b, and the non-contact surface (second surface) of the elastic member 17 is supported or biased by the holding member 16 so that the contact surface of the elastic member 17 is held in contact with the lower sealed container 1b. The positioning protrusion 17a is provided on the non-contact surface of the elastic member 17.

[0077] Also in the lower vibration damping device 19, the holding member 16 holds the elastic member 17 by the holding surface (first surface) so that the contact surface of the elastic member 17 abuts against the lower sealed container 1b (structural body). As shown in FIG. 1 or FIG. 5, the bottom surface (structural body surface) of the sealed container 1 (lower sealed container 1b) is curved convex downward. Therefore, the holding member 16 is also curved along the curvature of the bottom surface. The fixing portions 16b provided at both ends of the holding member 16 are portions for fixing the holding member 16 to the lower sealed container 1b, and are formed as protrusions protruding to the holding surface (first surface) side, similar to the upper vibration damping device 18.

[0078] Since the holding member 16 interposes the elastic member 17 between the holding member 16 and the surface of the lower sealed container 1b (structural body), the holding member 16 has a predetermined interval between the holding member 16 and the lower sealed container 1b and is partially fixed to the lower sealed container 1b by the fixing portion 16b. In the present embodiment, similar to the upper vibration damping device 18, the fixing portion 16b is welded to the inner surface of the lower sealed container 1b.

[0079] Also in the lower vibration damping device 19, the positioning hole 16a of the holding member 16 is formed at a position corresponding to the positioning projection 17a of the elastic member 17. As a result, since the positioning projection 17a enters into the positioning hole 16a, the elastic member 17 is positioned with respect to the holding member 16. The holding member 16 is fixed to the lower sealed container 1b, but the elastic member 17 is only positioned by the holding member 16. Therefore, the elastic member 17 can abut against the lower sealed container 1b in a positioned state without being fixed to the lower sealed container 1b.

[0080] As shown in FIG. 5, in the lower vibration damping device 19 according to the present embodiment, the elastic member 17 of a flat plate (plate member) is sandwiched between the lower sealed container 1b (structure) and the holding member 16. The holding member 16 has a holding surface that substantially conforms to the curvature of the lower sealed container 1b, and is fixed to the lower sealed container 1b so that a gap with a predetermined interval is formed between the holding member 16 and the inner surface (bottom surface) of the lower sealed container 1b.

[0081] As described above, in both the upper vibration damping device 18 and the lower vibration damping device 19, in the present embodiment, the fixing portion 16b is welded to the inner surface of the sealed container 1 (the inner surface (ceiling surface) of the upper sealed container 1a in the case of the upper vibration damping device 18, and the inner surface (bottom surface) of the lower sealed container 1b in the case of the lower vibration damping device 19.), and thereby fixed to the sealed container 1 (structure), whereby the vibration damping devices 18 and 19 are attached to the sealed container 1. This point will be described with reference to FIG. 6 by exemplifying the upper vibration damping device 18.

[0082] As shown in FIG. 6, the elastic member 17 is disposed between the inner surface of the upper sealed container 1a, that is, the ceiling surface (lower side in the figure), and the holding member 16. The holding member 16 is curved so as to substantially conform to the curvature of the inner surface of the upper sealed container 1a as described above. On the other hand, the elastic member 17 is a plate member having elasticity, and is a flat plate shape that does not curve in a state where it is not held by the holding member 16 (a state where no external force is applied).

[0083] Here, as described above, two positioning holes 16a are formed along the longitudinal direction in the central portion in the longitudinal direction of the holding member 16. As described above, two positioning protrusions 17a are formed along the longitudinal direction in the central portion in the longitudinal direction of the elastic member 17 positioned between the holding member 16 and the inner surface of the upper sealed container 1a. The positioning protrusion 17a protrudes toward the non-contact surface side of the elastic member 17, that is, the holding surface side of the holding member 16. Before fixing the holding member 16 to the upper sealed container 1a, the positioning hole 16a of the holding member 16 and the positioning protrusion 17a of the elastic member 17 are aligned.

[0084] Fixing portions 16b are provided at both ends of the holding member 16 as protrusions protruding toward the holding surface side. When the holding member 16 abuts against the upper sealed container 1a, a predetermined gap (predetermined interval) corresponding to the thickness of the elastic member 17 is secured between the holding member 16 and the holding surface. At this time, since the inner surface of the upper sealed container 1a and the holding member 16 are curved so as to have substantially the same curvature, the predetermined interval formed therebetween also becomes a curved space region. On the other hand, the elastic member 17 sandwiched therebetween is flat when no external force is applied, but curves due to its elasticity when an external force is applied.

[0085] Therefore, as shown in the lower part of FIG. 6, the elastic member 17 is sandwiched between the upper sealed container 1a and the holding member 16, and while pressing the holding member 16 toward the upper sealed container 1a side (inner surface side or ceiling surface side) from the non-holding surface side of the holding member 16, the fixing portion 16b is energized. Thereby, the fixing portion 16b can be melted, and the holding member 16 is fixed to the inner surface of the upper sealed container 1a. At this time, the holding member 16 holds the elastic member 17 in a state of being biased toward the inner surface (structural body surface) of the upper sealed container 1a.

[0086] Upon fixation, as described above, the two positioning protrusions 17a enter the two positioning holes 16a respectively. Therefore, the position of the elastic member 17 with respect to the inner surface of the upper sealed container 1a is positioned by the holding member 16. Therefore, the elastic member 17 can stably abut in a curved and positioned state along the inner surface of the upper sealed container 1a. In this way, the upper vibration damping device 18 can be attached to the inner surface (ceiling surface) of the upper sealed container 1a.

[0087] Note that the attachment of the lower vibration damping device 19 is the same as above, so detailed description is omitted. However, as is clear from FIG. 1, lubricating oil 7 is stored in the inner surface (bottom surface) of the lower sealed container 1b to which the lower vibration damping device 19 is attached. Therefore, the entire lower vibration damping device 19 will be immersed in the lubricating oil 7.

[0088] [Vibration damping action by the vibration damping device] Regarding reducing, mitigating or suppressing (damping) the vibrations generated during the operation of the hermetic compressor with the above-described configuration by the vibration damping devices 18 and 19, and thereby reducing or suppressing the noise during operation, reference will be made to FIGS. 1 to 5, as well as FIGS. 12, 13A and 13B for explanation.

[0089] When the compressor body 4 of the hermetic compressor performs a compression operation, as described above, pulsations occur in the flow of the refrigerant gas 6. As a result, the compressor body 4 elastically supported by the suspension spring 5 in the sealed container 1 also generates pulsations. Furthermore, the pulsations of the compressor body 4 are excited by other vibrations. Along with this, pulsations are propagated to the sealed container 1 through the refrigerant gas 6 or the lubricating oil 7, etc., causing the sealed container 1 to be excited and vibrate. When the sealed container 1 vibrates in this way, noise is generated.

[0090] When the sealed container 1 vibrates, for example, focusing on the upper sealed container 1a and the upper vibration damping device 18 shown in FIG. 2 or FIG. 3, with the vibration of the upper sealed container 1a, within the gap (within a predetermined interval) between the upper sealed container 1a and the holding member 16, a fine sliding displacement occurs in the elastic member 17. This is because the elastic member 17 is not only not fixed to the upper sealed container 1a but also not fixed only by being positioned with respect to the holding member 16.

[0091] Due to this fine sliding variation, the elastic member 17 converts the vibration energy possessed by the upper sealed container 1a into thermal energy. Thereby, not only can the vibration of the upper sealed container 1a be reduced, alleviated or suppressed, but also the noise associated with the vibration can be effectively reduced or suppressed. In the lower sealed container 1b and the lower vibration damping device 19 shown in FIG. 4 or FIG. 5, the same operation as described above is realized.

[0092] Furthermore, when the elastic member 17 undergoes a fine sliding variation, the load applied to the sealed container 1 (upper sealed container 1a or lower sealed container 1b) depends on the elastic force of the elastic member 17. Specifically, for example, as described in Patent Document 1, generally, the energy attenuation amount between the contact portion of the elastic member 17 and the inner surface of the sealed container 1 is given by the following formula. ΔS = 4∫Fδdx

[0093] Here, ΔS in the above formula is the energy attenuation amount, F is the contact force of the elastic member 17, δ is the relative displacement amount of the contact portion of the elastic member 17, and dx is the contact range of the elastic member 17.

[0094] In the present disclosure, an elastic member 17, which is a plate member, is in full contact with the inner surface of the upper sealed container 1a. Therefore, the contact force F of the elastic member 17 depends on the elastic force of the elastic member 17, and the contact range dx of the elastic member 17 depends on the area of the elastic member 17. The contact force of the elastic member 17 against the sealed container 1 or the contact range of the elastic member 17 against the sealed container 1 can be adjusted relatively easily compared with the conventional vibration damping methods. As a result, compared with the prior art, the vibration of the sealed container 1 can be damped more stably, and the noise caused by the vibration can be reduced.

[0095] Also, in the present embodiment, the object (structure) where vibration occurs is the sealed container 1 of the hermetic compressor. As is apparent from FIG. 1, the entire sealed container 1 can be regarded as substantially spherical. For this reason, for example, on the fixing surface of the upper sealed container 1a to which the upper vibration damping device 18 is fixed, in addition to the vibration in the direction perpendicular to the fixing surface (hereinafter, this is referred to as the main vibration), relatively weak vibrations (hereinafter, these are referred to as sub-vibrations) are also generated in the direction intersecting the main vibration. That is, it is presumed that three-dimensional vibrations occur in the sealed container 1.

[0096] In the vibration damping devices 18 and 19 according to the present embodiment, even for the three-dimensional vibration of the sealed container 1, a fine sliding displacement occurs in the elastic member 17, and a good vibration damping effect can be exerted thereby. Therefore, the noise caused by the vibration of the sealed container 1 can be more effectively reduced.

[0097] Also, as described above, the compression element 3 of the hermetic compressor according to the present embodiment is of a reciprocating type. With such a configuration, there is a possibility that noise in a specific harmonic resonance frequency band (for example, within the range of 2 kHz to 8 kHz) is generated due to the vibration of the sealed container 1. On the other hand, for the vibration damping devices 18 and 19 according to the present embodiment, the noise in the resonance frequency band specific to this reciprocating type can be favorably reduced by the fine sliding displacement in the elastic member 17.

[0098] Also, as described above, in the hermetic compressor according to the present embodiment, by providing an inverter circuit, the compression element 3 may be inverter-driven at a plurality of operating frequencies. When the compression element 3 is inverter-driven, the operation of the compression mechanism (in the present embodiment, since it is a reciprocating type, it is composed of a piston 12 and a bore) changes speed, so the frequency applied to the hermetic container 1 fluctuates. On the other hand, with the vibration damping devices 18 and 19 according to the present embodiment, a good friction damping effect can be exerted, so an effective vibration damping action can be realized and noise can be reduced well.

[0099] Note that, as described above, conventionally, a method of realizing a vibration damping action by attaching an elastic member to a hermetic container has been known.

[0100] In the above Patent Document 1, as shown in FIG. 12, a vibration damping plate 102 as an elastic member is fixed to the inner surface of the hermetic container 101 of the hermetic compressor by a fixing portion 103, for example, by spot welding. This vibration damping plate 102 includes a plurality of contact portions 104a, 104b, 104c, 104d, 104e, 104f, and these contact portions 104a to 104f are elastically in contact with the hermetic container 101. Such an elastic member has a plurality of contact portions 104a to 104f partially contacting different portions of the surface of the hermetic container 101 (structure). Thereby, since the vibration damping plate 102 can be stably brought into contact with the inner surface (structure surface) of the hermetic container 101, it is said that good vibration reduction and noise reduction effects can be obtained.

[0101] However, as described in Patent Document 2, in the vibration damping plate 102 described in Patent Document 1, when it is welded and fixed by the fixing portion 103 of the hermetic container 101, the contact portions 104a to 104f of the vibration damping plate 102 may elastically contact with plastic deformation. Therefore, there is a possibility that variations may occur in the contact positions or contact loads of the plurality of contact portions 104a to 104f. As a result, variations occur in the contact friction damping effect of the vibration damping plate 102, so a good vibration damping action cannot be obtained and the noise reduction effect may also be reduced.

[0102] Therefore, in Patent Document 2 described above, as shown in FIGS. 13A and 13B, a vibration damping member 202 is used which has a fixed portion 204 that is a part fixed to the sealed container 201, a free end 203 that is the other part, and a connecting portion 206 that connects the fixed portion 204 and the free end 203. This vibration damping member 202 includes a plurality of contact portions 205a to 205d in which a part other than the free end 203 elastically contacts the surface of the sealed container 201.

[0103] In this vibration damping member 202, it is fixed to the sealed container 201 (structure) by the fixed portion 204, and the free end 203 is vibratable. As a result, the natural frequency of the vibration damping member 202 can be made to substantially match the natural frequency of the sealed container 201 (structure). Consequently, the vibration damping member 202 can exhibit a dynamic vibration absorber effect. Further, the plurality of contact portions 205a to 205d on the side opposite to the free end 203 are in contact with the sealed container 201 (structure) in a state having an elastic force. Thereby, the vibration damping member 202 can exhibit a contact friction damping effect at the contact portions 205a to 205d.

[0104] Therefore, the vibration damping member 202 can suppress the vibration of the sealed container 201 (structure) by the dynamic vibration absorber effect and the contact friction damping effect. As a result, the noise of the hermetic compressor can also be reduced.

[0105] However, as described above, the vibration damping member 202 has a complicated structure such as including the free end 203 or including the plurality of contact portions 205a to 205d. Therefore, although it becomes easier to make the natural frequency of the vibration damping member 202 substantially match the natural frequency of the structure (sealed container 201) where vibration occurs, due to the complicated structure, there is a limit to the degree of freedom in corresponding to changes in the natural frequency. Also, while it can be easily specialized for a specific structure, it becomes difficult to apply it to other uses.

[0106] On the other hand, in the vibration damping devices 18 and 19 according to the present disclosure, the plate-shaped elastic member 17 is held by the holding member 16 so as to abut against the inner surface of the sealed container 1. With this configuration, the elastic member 17 does not get fixed to the inner surface of the sealed container 1 but abuts against the sealed container 1. As a result, the elastic member 17 is maintained in a state of being in contact with the sealed container 1 without being fixed thereto. Consequently, even if vibration occurs in the sealed container 1, the vibration is satisfactorily reduced, alleviated, or suppressed by the elastic action of the elastic member 17.

[0107] Moreover, the elastic member 17 is held between itself and the holding member 16 that is partially fixed to the inner surface of the sealed container 1, and abuts against the inner surface of the sealed container 1. Therefore, it is not necessary to adopt a complicated configuration, and a simple configuration can be realized.

[0108] In particular, when compared with a conventional configuration, for example, the vibration damping plate 102 disclosed in Patent Document 1, in the present disclosure, since the elastic member 17 is only held by the holding member 16 and abuts against the sealed container 1, the possibility of variation in load due to plastic deformation is suppressed or avoided. Therefore, with the vibration damping devices 18 and 19 according to the present disclosure, a good vibration damping effect and a noise reduction effect can be obtained.

[0109] Furthermore, the contact property of the elastic member 17 with the inner surface of the sealed container 1 depends on the elasticity of the elastic member 17, and the contact range of the elastic member 17 with the inner surface of the sealed container 1 depends on the area of the elastic member 17. Since the elastic member 17 is a plate member having elasticity, it is possible to easily adjust the contact property or the contact range of the elastic member 17. As a result, it becomes possible to easily realize vibration damping performance corresponding to the vibration generated in the sealed container 1, and it becomes possible to apply it not only to hermetic compressors but also to other fields.

[0110] [Modification Example of Vibration Damping Device] Next, typical modification examples of the vibration damping devices 18 and 19 according to the present disclosure will be specifically described. FIGS. 7A to 7C are an example of the holding member used in the vibration damping devices 18 and 19, FIGS. 8A and 8B are an example of the elastic member used in the vibration damping devices 18 and 19, and FIGS. 9A to 9C are other examples of the elastic member.

[0111] The holding member 16 shown in FIG. 7A is provided in the vibration damping devices 18 and 19 described above, and as described above, it is configured as a plate member having a longitudinal direction. At the central portion in the longitudinal direction of the holding member 16, two positioning holes 16a are formed side by side along the longitudinal direction, and fixing portions 16b are provided at both ends thereof. Further, as is clear from the cross-sectional view of FIG. 7A, the holding member 16 is curved so as to have a curvature substantially matching the curvature of the inner surface of the sealed container 1.

[0112] The holding member 26 shown in FIG. 7B has the same basic configuration as the holding member 16, but is not a plate member having a longitudinal direction like the holding member 16, but is configured as a substantially square plate member. Therefore, near the central portion of the holding member 26, two positioning holes 26a are formed side by side along the vertical direction in the drawing, and fixing portions 26b are provided on both side edges of the holding member 26 so as to face each other along the arrangement direction of the positioning holes 26a. Therefore, the first fixing portions 26b, the two positioning holes 26a, and the second fixing portions 26b are arranged in a row in this order.

[0113] The holding member 36 shown in FIG. 7C is also a plate member like the holding member 16 or the holding member 26, but is configured in a substantially equilateral triangle shape. Near the centroid of the equilateral triangle in the holding member 36, two positioning holes 36a are formed side by side along the vertical direction in the drawing. The direction in which the positioning holes 36a are arranged corresponds to the perpendicular bisector of the equilateral triangle. Further, the fixing portions 36b of the holding member 36 are provided at positions corresponding to the apex angle and each base angle of the equilateral triangle, respectively. Therefore, unlike the holding member 16 or the holding member 26, the holding member 36 is provided with a total of three fixing portions 36b. Thus, the fixing portions 16b to 36b provided in the holding members 16 to 36 are not limited to two and may be three or more.

[0114] The elastic member 17 shown in Fig. 8A is provided in the above-described vibration damping devices 18 and 19. As described above, similar to the holding member 16 shown in Fig. 7A, it is configured as a plate member having a longitudinal direction. In the central portion of the elastic member 17 in its longitudinal direction, two positioning protrusions 17a are provided along the longitudinal direction. As described above, the positions of the positioning protrusions 17a of the elastic member 17 and the positions of the positioning holes 16a of the holding member 16 correspond to each other. As described above, since the elastic member 17 has elasticity, it is flat without bending unless an external force is applied.

[0115] Also, as described above, the positioning protrusion 17a protrudes toward the side that contacts the holding surface of the holding member 16 without contacting the non-contact surface of the elastic member 17, that is, the inner surface of the sealed container 1. The specific configuration of the positioning protrusion 17a is not particularly limited, but as shown in Fig. 8B, a configuration in which a plate member is punched out from the contact surface (left side in the figure) to the non-contact surface (right side in the figure) can be cited. Such an elastic member 17 can contact the surface of a vibrating structure such as the sealed container 1 with a relatively large contact area as compared with a conventional vibration damping plate having elasticity (see, for example, Patent Document 1). Thereby, the resonance level of the sealed container 1 (structure) can be made smaller.

[0116] Also, the specific configuration of the elastic member 17 is not limited to the configuration shown in Fig. 8A, and a configuration as shown in Figs. 9A to 9C can also be adopted. The elastic member 17 is supported or biased by the holding member 16 and contacts the surface of a vibrating structure (the sealed container 1 in the present embodiment). Therefore, in the present disclosure, the elastic member 17 may be a plate member having a two-dimensional spread such as a leaf spring. Therefore, its shape is not limited to a strip shape (or rectangular shape) having a longitudinal direction as shown in Fig. 8A.

[0117] For example, the elastic member 27 shown in FIG. 9A is configured as a substantially square plate member, similar to the holding member 26 shown in FIG. 7B. Near the central portion of the elastic member 27, two positioning protrusions 27a are formed side by side along the vertical direction in the drawing so as to correspond to the positioning holes 26a of the holding member 26. The elastic member 27 is also flat without curving unless an external force is applied, similar to the elastic member 17.

[0118] The elastic member 37 shown in FIG. 9B is a substantially rhombic plate member, and the vertical direction in the drawing is the longitudinal direction. Similar to the elastic member 17, two positioning protrusions 37a are formed along the longitudinal direction at approximately the central portion in the longitudinal direction of the elastic member 37. The elastic member 37 is also flat without curving unless an external force is applied, similar to the elastic member 17 or the elastic member 27.

[0119] When the direction along the vertical direction in FIG. 9C is defined as the first direction, two positioning protrusions 47a are arranged side by side near the central portion in the first direction for the elastic member 47 shown in FIG. 9C. Further, when the direction along the horizontal direction in the drawing, that is, the direction orthogonal to the first direction is defined as the second direction, the elastic member 47 has a portion that extends greatly in the second direction. In the example shown in FIG. 9C, thin plate-like portions extend from both ends in the first direction along the second direction in opposite directions. Also, thin plate-like members extend from the central portion in the first direction along the second direction in opposite directions.

[0120] In other words, the elastic member 47 can also be expressed as a plate member in which the second direction is the longitudinal direction, and two positioning protrusions 47a are arranged side by side along the direction (first direction) orthogonal to the second direction at the central portion in the second direction, and two slits are formed from both ends in the second direction toward the central portion. The elastic member 47 is also flat without curving unless an external force is applied, similar to the elastic member 17, the elastic member 27, or the elastic member 37.

[0121] The elastic member 17 shown in FIG. 8A (or FIG. 2 or FIG. 4), the elastic member 27 shown in FIG. 9A, the elastic member 37 shown in FIG. 9B, or the elastic member 47 shown in FIG. 9C are all plate members that spread two-dimensionally. As a result, the spreading surface can be brought into good contact with the structure (sealed container 1), so that the contact area between the elastic member 17 and the structure can be increased, and a better vibration damping effect can be realized.

[0122] Moreover, the elastic member 27 shown in FIG. 9A, the elastic member 37 shown in FIG. 9B, and the elastic member 47 shown in FIG. 9C all have a relatively larger spreading area compared to the elastic member 17 shown in FIG. 8A. Therefore, the contact area with the sealed container 1 (structure) can be made larger than that of the elastic member 17. As a result, these elastic members 27 to 47 can exhibit a damping effect on vibrations of more frequencies.

[0123] In particular, the rhombic elastic member 37 shown in FIG. 9B can be described as including portions protruding on both sides compared to the elastic member 17 having a simple longitudinal direction. Therefore, the elastic member 37 has a shape that is more likely to move three-dimensionally compared to the elastic member 17. Furthermore, the elastic member 47 shown in FIG. 9C can be described as including three portions extending on each of the two side portions compared to the elastic member 17. Therefore, the elastic member 47 has a shape that is more likely to move three-dimensionally compared to the elastic member 27 or the elastic member 37.

[0124] Thus, the shapes of the elastic members 17 to 47 are not particularly limited, and the shape of the plate member can be appropriately designed to adjust the contact area according to the inner surface shape of the structure (sealed container 1 in this embodiment) where vibration occurs, or the degree of vibration (or noise) generated. The contact range of the elastic members 17 to 47 on the surface of the structure depends on the area of the elastic members 17 to 47. Therefore, by changing the shape of the elastic members 17 to 47 or adjusting the partial dimensions, the contact range on the surface of the structure can be easily adjusted. As a result, it becomes possible to easily realize the vibration damping performance according to the vibration generated in the structure.

[0125] The specific material of the elastic member 17 (or elastic members 27 to 47) is not particularly limited. Generally, it is made of metal and may be quenched. This enables the easy manufacture of the elastic member 17 and allows the adjustment of the elasticity of the elastic member 17 by quenching. The specific metal material is not particularly limited, but typically, for example, various steel materials (such as stainless steel), phosphor bronze, beryllium copper, titanium spring material, etc. can be mentioned. More preferable materials include, for example, stainless steel, spring steel, etc. In the examples described later, SK material (carbon tool steel material) is used.

[0126] It is sufficient that the surface of the elastic member 17 is subjected to oxidation treatment. As a result, if the elastic member 17 is made of metal, an oxide film can be formed on the surface. Therefore, the surface of the elastic member 17 can be protected, and the stability of the elastic member 17 can be improved. Furthermore, when attaching the vibration damping devices 18, 19 to the sealed container 1, for example, when using projection welding, during projection welding, the oxide film can prevent the elastic member 17 from being energized. Thereby, welding between the sealed container 1 and the elastic member 17 can be avoided or prevented.

[0127] The thickness of the elastic member 17 is not particularly limited either and can be appropriately set according to various conditions. Generally, it may be within the range of 0.1 to 1 mm. This allows the elastic member 17 to fit well to the inner surface of the sealed container 1, so a greater damping effect can be obtained. Also, depending on the material of the elastic member 17, if the elastic member 17 is made of metal, the elasticity of the elastic member 17 can be adjusted by appropriately adjusting its thickness within the above range.

[0128] The specific elastic modulus of the elastic member 17 is not particularly limited either and can be appropriately set according to various conditions. Generally, the Young's modulus may be within the range of 100,000 to 300,000 N / mm 2 and more preferably, as an example of the range, it is within the range of 150,000 to 250,000 N / mm 2It can be within the range. Although it depends on conditions such as the type, structure, or material of the structure where vibration occurs, for example, if the structure is the sealed container 1, by the Young's modulus of the elastic member 17 being within the above range, vibration (or noise) can be attenuated even better.

[0129] As described above, the contact range of the elastic member 17 on the surface of the structure depends on the area of the elastic member 17, but the contact property of the elastic member 17 on the surface of the structure depends on the elasticity of the elastic member 17. The elasticity (Young's modulus) of the elastic member 17 can be appropriately set according to various conditions such as the type of material, thickness, quenching treatment, etc. Therefore, by adjusting the elasticity of the elastic member 17, the contact property of the elastic member 17 can be easily adjusted in the same way as the contact range. Thereby, it becomes possible to easily realize the vibration damping performance corresponding to the vibration generated in the structure.

[0130] In particular, by setting the Young's modulus of the elastic member 17 within the above range, F (contact force) can be increased without reducing δ (relative displacement amount of the contact part) in the calculation formula of the energy attenuation amount ΔS described above. Thereby, vibration (or noise) generated in the structure can be attenuated even better. Note that increasing the contact area of the elastic member 17 means increasing dx in the calculation formula of the energy attenuation amount ΔS described above.

[0131] Here, in the elastic member 17 shown in FIG. 8A or the elastic members 27 to 47 shown in FIGS. 9A to 9C, the shape of the corner or the longitudinal end in the plate member only needs to be a convex curved shape. In other words, in the elastic members 17 to 47, the corner or the end only needs to be configured to form a roundness (with an R) instead of having a sharp angle.

[0132] As described above, the elastic member 17 (or elastic members 27 to 47) may be a plate member. Although the holding member 16 (or holding members 26 and 36) is also a plate member like the elastic member 17, the holding member 16 does not necessarily have to be a plate member as long as it can hold the elastic member 17 facing the surface of the structure. That is, the specific shape of the holding member 16 is not limited as long as it can abut and hold the elastic member 17 against the surface of the structure. Therefore, for example, the holding member 16 (or holding members 26 and 36) may have a three-dimensional shape (block shape) instead of a planar shape like a plate member.

[0133] As in the present embodiment, if the structure is the sealed container 1 and the inner surfaces (ceiling surface) of the upper sealed container 1a and the inner surfaces (bottom surface) of the lower sealed container 1b are both curved so that the outside is convex, the holding surface of the elastic member 17 in the holding member 16 only needs to have a curvature corresponding to the curvature of the surface of this structure. In other words, the holding member 16 only needs to include a portion having a curvature corresponding to the curvature of the surface of the structure, and the surface of the said portion is the holding surface of the elastic member 17.

[0134] Alternatively, the holding member 16 may be partially plate-shaped. For example, the fixing portion 16b may have a three-dimensional shape (block shape), and the portion having the holding surface may be plate-shaped. Here, when the holding member 16 is a plate member or partially plate-shaped, as shown in FIG. 3 or FIG. 5, the thickness of the plate-shaped portion of the holding member 16 only needs to be larger than the thickness of the elastic member 17 which is a plate member. Thereby, the elastic member 17 can be held well by the holding member 16, and it is possible to suppress the holding member 16 from becoming excessively large.

[0135] In addition, if both the holding member 16 and the elastic member 17 are plate members, they may be formed of a known iron-based material plate (so-called iron plate). By using such an iron plate, the size of the vibration damping devices 18 and 19 can be reduced, and the cost can also be reduced. As a result, when the vibration damping devices 18 and 19 are applied to a hermetic compressor, the enlargement of the hermetic compressor and the cost increase can be suppressed, and a more compact and inexpensive hermetic compressor can be provided. In the embodiments described later, an SK material is used as the elastic member 17, and a steel material is used as the holding member 16.

[0136] The number of the positioning protrusions 17a provided on the elastic member 17 is not particularly limited, and two or more, that is, a plurality of them may be sufficient. Since the positioning holes 16a provided in the holding member 16 are provided at positions corresponding to the positioning protrusions 17a, the number of the positioning holes 16a may also be the same as that of the positioning protrusions 17a, that is, a plurality of them. Depending on the shape of the elastic member 17 or the shape of the holding member 16, etc., by forming a plurality of the positioning holes 16a and the positioning protrusions 17a respectively, the position of the elastic member 17 held by the holding member 16 with respect to the structure (the sealed container 1 in the present embodiment) can be appropriately set.

[0137] Also, the shapes of the positioning holes 16a and the positioning protrusions 17a are not particularly limited. In the present embodiment, they are circular as shown in FIGS. 2 to 5, but they may be rectangular, elliptical, triangular, etc., or may be linear, that is, holes and protrusions having a longitudinal direction. Also, the dimensions of the positioning holes 16a and the positioning protrusions 17a are not particularly limited, and can be appropriately set according to various conditions such as the spreading area of the elastic member 17 and the holding member 16, for example.

[0138] Also, the positions of the positioning holes 16a in the holding member 16 and the positioning projections 17a in the elastic member 17 are not particularly limited, and can be appropriately set according to the shape of the holding member 16 or the elastic member 17 or the like. In the present embodiment, as described above, since both the holding member 16 and the elastic member 17 are plate members having a longitudinal direction (primary direction), by arranging a plurality of positioning holes 16a and positioning projections 17a along the longitudinal direction, the elastic member 17 can be positioned well with a simple configuration.

[0139] In the present embodiment, only one elastic member 17 held by the holding member 16 is provided, but the present disclosure is not limited thereto, and two or three or more (a plurality of) elastic members 17 may be held by the holding member 16. Similarly, in the present embodiment, one elastic member 17 is held by one plate-shaped holding member 16, but the present disclosure is not limited thereto, and the elastic member 17 may be held by two or three or more (a plurality of) holding members 16. From the viewpoint of suppressing an increase in the number of members, it is sufficient that both the holding member 16 and the elastic member 17 are each one.

[0140] Even when many resonance frequency peaks occur in a structure (for example, the sealed container 1 of a hermetic compressor) to which the vibration damping devices 18 and 19 are attached, a plurality of elastic members 17 can be held in accordance with these peaks. Thereby, since these many peaks can be attenuated well, vibration (or noise) can be attenuated even better.

[0141] Here, in the present embodiment, as shown in FIG. 1, two vibration damping devices, i.e., an upper vibration damping device 18 and a lower vibration damping device 19, are provided for the sealed container 1. However, the present disclosure is not limited thereto. For example, only the upper vibration damping device 18 may be provided for the sealed container 1, or only the lower vibration damping device 19 may be provided for the sealed container 1, or three or more vibration damping devices may be provided. According to the present disclosure, by providing at least one vibration damping device for the sealed container 1, a good vibration damping effect can be realized. By providing a plurality of vibration damping devices, it is possible to attenuate the peaks of a plurality of resonance frequencies in the sealed container 1 and obtain a more powerful damping effect.

[0142] Further, in the present embodiment, as shown in FIGS. 1 to 5, the vibration damping devices 18 and 19 are both provided on the inner surface of the sealed container 1. However, the present disclosure is not limited thereto, and they may be provided on the outer surface of the sealed container 1. That is, the installation positions of the vibration damping devices 18 and 19 are not particularly limited, and they can be installed at suitable positions on the surface of the structure according to various conditions of the structure where vibration occurs. As a specific example of the installation positions of the vibration damping devices 18 and 19, for example, the position at the center of the natural vibration mode can be mentioned. There are a plurality of centers of the natural vibration mode depending on the frequency to be attenuated. In the examples described later, they are installed at the position at the center of the frequency of 4 to 6 kHz.

[0143] In the case of a hermetic compressor, the vibration damping devices 18 and 19 may be provided on the inner surface of the sealed container 1 as described above. In the vibration damping devices 18 and 19, since the elastic member 17 is held by the holding member 16 and is not fixed to the sealed container 1, the elastic member 17 and the holding member 16 may resonate. Although noise may be generated by this resonance, by providing the vibration damping devices 18 and 19 on the inner surface of the sealed container 1, it is possible to soundproof the noise generated by resonance with the sealed container 1.

[0144] In addition, in the present embodiment, an example in which the vibration damping device is applied to a hermetic compressor (an example in which the vibrating structure is a hermetic container) is given to specifically describe the present disclosure. However, the present disclosure is not limited to this, and as described above, it can also be applied to fields other than hermetic compressors. For example, the vibration damping device according to the present disclosure can also be applied to refrigerators, air conditioners, etc.

[0145] When applying the vibration damping device according to the present disclosure to a refrigerator, the vibrating structure is the refrigerator body, and the vibration damping device according to the present disclosure can be attached to, for example, the side surface of the refrigerator body. When applying the vibration damping device according to the present disclosure to an air conditioner, for example, the outdoor unit can be cited as the vibrating structure. In this case, the vibration damping device according to the present disclosure can be attached to the wall surface of the outdoor unit or the like.

[0146] As described above, in the present disclosure, when the vibrating structure particularly has a resonance frequency, the vibration damping effect can be realized well with a simple configuration, and it is also possible to reduce or mitigate the noise generated along with the vibration. Therefore, the present disclosure can be applied to a wide range of industrial products.

Example

[0147] The present disclosure will be described more specifically based on the following examples and comparative examples, but the present invention is not limited thereto. Those skilled in the art can make various changes, modifications, and alterations without departing from the scope of the present invention.

[0148] (Example 1) Prepare the upper sealed container 1a of the hermetic compressor, use an SK material with a length of 50 mm, a width of 18 mm, and a thickness of 0.4 mm as the elastic member 17, and use a steel plate with a length of 80 mm, a width of 30 mm, and a thickness of 2 mm as the holding member 16.

[0149] An elastic member 17 is sandwiched between the ceiling surface of the upper sealed container 1a and the holding member 16, the elastic member 17 and the holding member 16 are positioned and pressed, and the fixing portion 16b of the holding member 16 is energized to melt the fixing portion 16b and fix it to the inner surface of the upper sealed container 1a (see FIG. 6). Thereby, the upper vibration control device 18 was attached to the inner surface (ceiling surface) of the upper sealed container 1a. Thereby, a test sample according to Example 1 was obtained (see FIG. 2).

[0150] A hermetic compressor using the test sample according to Example 1 was prepared, an acceleration pickup was installed in the upper sealed container 1a, and a shock test was performed in a state where the hermetic compressor was not driven. In this shock test, a shock was applied in the vertical direction with respect to the ground, and an acceleration signal in the same direction as the shock direction was measured. Frequency analysis was performed on the measured acceleration signal using an FFT (Fast Fourier Transform) analyzer to obtain a power spectrum. The results, that is, the results of the vibration level with respect to frequency are shown in FIG. 10A.

[0151] Furthermore, with the hermetic compressor driven, condenser microphones were installed in four directions at a position 100 mm from the hermetic compressor, and the noise was measured. Frequency analysis was performed on the measured noise signal using an FFT analyzer to obtain a power spectrum. The results, that is, the results of the noise level with respect to frequency are shown in FIG. 10B.

[0152] (Comparative Example 1) The vibration level and noise level of the upper sealed container 1a were measured in the same manner as in Example 1, except that the upper sealed container 1a without the upper vibration control device 18 was used as the test sample according to Comparative Example 1. The results of the vibration level with respect to frequency are shown in FIG. 10A, and the results of the noise level with respect to frequency are shown in FIG. 10B.

[0153] In FIGS. 10A and 10B, the broken line indicates the vibration level (unit: m / s of the test sample according to Comparative Example 1 (only the upper sealed container 1a)) 2( / N) and the noise level (unit: dB), where the solid line represents the vibration level (unit: m / s of the test sample according to Example 1 (upper vibration damping device 18 equipped with the upper vibration damping device 18)) 2 ( / N) and the noise level (unit: dB).

[0154] (Comparison between Example 1 and Comparative Example 1) As is clear from the results of FIGS. 10A and 10B, in the test sample according to Comparative Example 1 (the dashed line in the figure), a large number of vibration peaks are confirmed in the vibration level, and a large number of noise peaks are also confirmed in the noise level. On the other hand, in the test sample according to Example 1 (the solid line in the figure), it can be seen that the peak of the vibration of the upper sealed container 1a is greatly suppressed, and the noise peak of the upper sealed container 1a is also greatly reduced.

[0155] As described above, both the elastic member 17 and the holding member 16 are iron plate members. Therefore, the configuration of the upper vibration damping device 18 using these is a simple configuration only by stacking and fixing the plate members, and does not require a large volume for installation compared with conventional vibration damping members. Therefore, it is possible to suppress or avoid the enlargement of the hermetic compressor, effectively suppress the cost increase, and make the hermetic compressor compact and inexpensive.

[0156] Furthermore, in the hermetic compressor according to the present disclosure, a configuration in which the electric element 2 is driven by an inverter at a plurality of operating frequencies can be adopted. In this case, it is assumed that the frequency applied to the upper sealed container 1a may change due to the variable speed of the compression operation by the compression element 3. However, as is clear from the results of FIGS. 10A and 10B, since the upper vibration damping device 18 can exhibit a damping effect at a wide range of frequencies, not only can the vibration damping effect be realized better, but also the noise can be reduced.

[0157] (Example 2) The lower sealed container 1b of the hermetic compressor was prepared, and using the same elastic member 17 and holding member 16 as in Example 1, the lower vibration damping device 19 was attached to the inner surface (bottom surface) of the lower sealed container 1b in the same manner as in Example 1, thereby obtaining a test sample according to Example 2 (see Fig. 4). In the test sample according to Example 2, a predetermined amount of lubricating oil 7 is stored in the lower sealed container 1b in order to approximate the state of an actual hermetic compressor.

[0158] For the test sample according to Example 2, in the same manner as in Example 1, the vibration level and noise level of the lower sealed container 1b were measured. The results of the vibration level with respect to frequency are shown in Fig. 11A, and the results of the noise level with respect to frequency are shown in Fig. 11B. (Comparative Example 2)

[0159] The vibration level and noise level of the lower sealed container 1b were measured in the same manner as in Example 2, except that the lower sealed container 1b without the lower vibration damping device 19 was used as the test sample according to Comparative Example 2. The results of the vibration level with respect to frequency are shown in Fig. 11A, and the results of the noise level with respect to frequency are shown in Fig. 11B.

[0160] Note that in the test sample according to Comparative Example 2 as well, a predetermined amount of lubricating oil 7 is stored in the lower sealed container 1b. Also, in Figs. 11A and 11B, the broken line represents the vibration level (unit: m / s 2 / N) and noise level (unit: dB) of the test sample according to Comparative Example 2, and the solid line represents the vibration level (unit: m / s 2 / N) and noise level (unit: dB) of the test sample according to Example 2.

[0161] (Comparison between Example 2 and Comparative Example 2) As is clear from the results of FIGS. 11A and 11B, in the test sample according to Comparative Example 2 (dashed line in the figure), as in the test sample according to Comparative Example 1, a large number of vibration peaks are confirmed at the vibration level, and a large number of noise peaks are also confirmed at the noise level. On the other hand, in the test sample according to Example 2 (solid line in the figure), as in the test sample according to Example 1, the peak of the vibration of the lower sealed container 1b is greatly suppressed, and it can be seen that the noise peak of the lower sealed container 1b is also greatly reduced.

[0162] As described above, in both the test sample according to Comparative Example 2 and the test sample according to Example 2, a predetermined amount of lubricating oil 7 is stored in the lower sealed container 1b. As is clear from the results of the test sample according to Example 2, it can be seen that the lower vibration damping device 19 can exhibit a good vibration damping effect and noise reduction effect even when immersed in the lubricating oil 7.

[0163] Thus, in the vibration damping devices 18 and 19 according to the present disclosure, since a fine sliding displacement can be generated between the sealed container 1 and the elastic member 17, a friction damping effect can be exhibited. Therefore, as shown in the results of Example 1 or Example 2, the vibration of the sealed container 1 can be reduced, alleviated or suppressed (vibration damped), and the noise due to the vibration can also be reduced.

[0164] Moreover, since the load of the elastic member 17 applied to the sealed container 1 depends on the elastic force of the elastic member 17, the load applied to the sealed container 1 (structural body) does not vary in the vibration damping devices 18 and 19. Therefore, in the vibration damping devices 18 and 19, the friction damping effect can be exhibited more stably.

[0165] Furthermore, as shown in the results of Example 1 or Example 2, in the vibration damping devices 18 and 19, the friction damping effect can also be exhibited against the three-dimensional vibration of the sealed container 1. Therefore, the peaks of a plurality of resonance frequencies of the sealed container 1 can be attenuated.

[0166] Therefore, when the vibration damping devices 18 and 19 are attached to a reciprocating type hermetic compressor (see FIG. 1), it is possible to reliably reduce the noise in the harmonic resonance frequency band (within the range of 2 kHz to 8 kHz) that is peculiar to the reciprocating type.

[0167] Note that the present invention is not limited to the description of the above embodiment, and various modifications are possible within the scope shown in the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments and a plurality of modification examples are also included in the technical scope of the present invention.

[0168] Also, from the above description, many improvements and other embodiments of the present invention will be apparent to those skilled in the art. Therefore, the above description should be construed as illustrative only and provided for the purpose of teaching those skilled in the art the best mode of carrying out the present invention. Without departing from the spirit of the present invention, the details of its structure and / or function can be substantially changed.

Industrial Applicability

[0169] The present invention can be widely and preferably used in the field of reducing, alleviating or suppressing (vibration damping) vibration in a structure where vibration occurs. Typically, for example, it can also be widely and preferably used in fields where noise is generated due to vibration of a hermetic container, such as a hermetic compressor.

Explanation of Reference Numerals

[0170] 1: Hermetic container 1a: Upper hermetic container 1b: Lower hermetic container 2: Electric element 3: Compression element 4: Compressor body 5: Suspension spring 5a: Spring receiving part 6: Refrigerant gas 7: Lubricating oil 8: Suction pipe 9: Discharge pipe 10: Shaft 11: Cylinder block 12: Piston 13: Connecting part 14: Rotor 15: Stator 16: Holding member 16a: Positioning hole 16b: Fixing part 17: Elastic member 17a: Positioning protrusion 18: Upper vibration damping device 19: Lower vibration damping device 26: Holding member 26a: Positioning hole 26b: Fixing part 27: Elastic member 27a: Positioning protrusion 36: Holding member 36a: Positioning hole 36b: Fixing part 37: Elastic member 37a: Positioning protrusion 47: Elastic member 47a: Positioning protrusion

Claims

1. An elastic plate-like elastic member that can be deformed to abut against the surface of a vibrating structure, and a holding member that holds the elastic member in contact with the surface of the structure, comprising: the holding member is partially fixed with a predetermined interval from the surface of the structure, The Young's modulus of the elastic member is in the range of 100,000 to 300,000 N / mm 2 and within this range, the elastic member is held between the holding member and the surface of the structure and abuts without being fixed to the surface of the structure, characterized in that a vibration damping device.

2. The surface of the structure is curved, and the holding member includes a portion having a curvature corresponding to the curvature of the surface of the structure, The vibration damping device according to claim 1.

3. The shape of the corner or the longitudinal end portion of the plate-like elastic member is a convex curved shape, The vibration damping device according to claim 1 or 2.

4. On the non-contact surface, which is the surface of the elastic member that does not contact the surface of the structure, among both surfaces of the elastic member, a plurality of protrusions are provided, The holding member is provided with holes at respective positions corresponding to the plurality of protrusions, The vibration damping device according to claim 1 or 2.

5. The thickness of the elastic member is in the range of 0.1 to 1 mm, The vibration damping device according to claim 1 or 2.

6. The holding member has a plate-like portion for holding the elastic member, and its thickness is larger than the thickness of the elastic member, The vibration damping device according to claim 5.

7. The holding member holds the elastic member in a state of being biased toward the surface of the structure, The vibration damping device according to claim 1 or 2.

8. The elastic member is made of metal and is subjected to quenching treatment, The vibration damping device according to claim 1 or 2.

9. The structure is a sealed container provided in a hermetic compressor, and the inner surface of the sealed container is the surface of the structure, The vibration damping device according to claim 1 or 2.

10. A sealed container, An electric element including a stator and a rotor, A compression element that compresses a fluid driven by the electric element, Comprising: The electric element and the compression element are housed in the sealed container, and lubricating oil is stored in the sealed container, Furthermore, a vibration damping device attached to the inner surface of the sealed container is provided, The vibration damping device is An elastic plate-like elastic member that can be deformed to contact the inner surface of the sealed container, A holding member that holds the elastic member in close contact with the inner surface of the sealed container, comprising: The holding member is partially fixed with a gap having a predetermined interval from the inner surface of the sealed container, The Young's modulus of the elastic member is in the range of 100,000 to 300,000 N / mm 2 and within the range of The elastic member is in contact with the surface of the structure without being fixed thereto while being held between the holding member and the inner surface of the sealed container. Hermetic compressor. Claim 11 The thickness of the elastic member is in the range of 0.1 to 1 mm. The hermetic compressor according to claim 10. Claim 12 The vibration damping device is attached to at least one of the upper inner surface and the lower inner surface in the sealed container. The hermetic compressor according to claim 10 or 11.

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