JPH04314982A - Rotary compressor vibration damping device - Google Patents

Abstract

PURPOSE:To surely attenuate the revolution vibration even if the revolution vibration having any frequency is generated on a rotary compressor side, by making the whole structure into relatively small-sized. CONSTITUTION:A supporting point shaft 3 is installed coaxially on a driving shaft 12 on the side surface in the axial direction of a sealed casing 1, and an inertial body 4 is supported in free revolution on the supporting point shaft 3, and a vibrating plate 5 which vibrates integrally with the revolution vibration of a rotary compressor is fixed on the supporting point shaft 3, and a vibration transmission member 6 which compulsorily transmits the revolution vibration of the vibrating plate 5 to the inertial body 4 so as to generate the vibration in the reverse revolution is interposed between the vibrating plate 5 and the inertial body 4, and the revolution vibration of the casing 1 which is transmitted to the vibrating plate 5 by the inertial force of the inertial body 4 is attenuated compulsorily, and the revolution vibration of the casing 1 is attenuated.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device for a rotary compressor.

0002

2. Description of the Related Art Generally, a rotary compressor such as a rotary compressor has a motor and a compression element driven by the motor integrated inside a sealed casing, so that the load on the compression element is When vibrations occur due to fluctuations, the vibrations are transmitted to the hermetic casing, causing rotational vibrations in the entire compressor.

[0003] Conventionally, the following vibration damping device has been proposed in order to prevent rotational vibration of the entire compressor. For example, as described in Japanese Utility Model Application Publication No. 59-107078 and shown in FIG.
a plurality of arms B extending from the outer wall of the casing A, and a weight C supported at the tip of each arm B.
By installing a vibration damping device D having The vibration frequency is set to be approximately equal to the vibration frequency, and when rotational vibration occurs in this compressor, the damping device D generates a vibration with an opposite phase, and the accompanying reaction torque damps the rotational vibration of the compressor. I try to let them do it. In addition, another vibration damping device is known, which is described in Japanese Patent Application Laid-Open No. 64-60793. Although not shown, this damping device uses one weight inside a sealed casing and two springs. The rotational vibration of the rotary compressor is damped through the weight and the spring.

0004

However, among the above vibration damping devices, the one shown in FIG. 4 has a weight C supported around the outer periphery of the sealed casing A via a plurality of arms B. Therefore, the mass of each weight C and each arm B
The length and spring constant of the damping device D can be relatively freely set, and the natural frequency of the damping device D can be brought close to the rotational frequency of the rotary compressor for effective damping. Since the weight C is supported around the outer periphery of A via a plurality of arms B, the entire compressor becomes large and there are restrictions on installing the compressor, and furthermore, it is difficult to adjust the mass of the weight C. Once the natural frequency of the damping device D is set, the rotational vibration of the compressor corresponding to this natural frequency can be damped. If a rotational vibration different from the natural frequency occurs, for example, when the compressor is operated by an inverter, and the rotational frequency changes due to frequency control, etc., the compression In some cases, it becomes impossible to dampen the rotational vibrations of the machine, or resonance occurs and the vibrations become even louder. Although not shown, in the damping device described in Japanese Patent Application Laid-open No. 64-60793, the weight is supported inside the sealed casing, so the overall structure of the compressor can be made smaller. On the other hand, since the weight is disposed inside the casing, the mass of the weight cannot be increased too much, and when large rotational vibrations occur in the compressor, the reaction torque by the weight becomes insufficient.
There was a problem that a sufficient damping effect could not be obtained.

The present invention was made in view of the above-mentioned problems, and its purpose is to reduce the overall structure of the rotary compressor by reducing the rotational vibration of any frequency that occurs on the rotary compressor side. An object of the present invention is to provide a vibration damping device that can reliably damp vibrations.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a motor 11 inside a sealed casing 1, and a compression element 1 interlockingly connected to a drive shaft 12 of the motor 11.
3, a fulcrum shaft 3 is provided on the axial side surface of the sealed casing 1 coaxially with the drive shaft 12, and an inertial body 4 is rotatably supported on the fulcrum shaft 3. At the same time, an excitation plate 5 that vibrates integrally with the rotational vibration of the rotary compressor is fixed to the fulcrum shaft 3, and the rotational vibration of the excitation plate 5 is applied to the inertial body 4 so that the rotational vibration of the excitation plate 5 becomes a reverse rotational vibration. A vibration transmission member 6 for forced transmission is interposed between the vibration plate 5 and the inertial body 4.

[0007] Furthermore, it is preferable that the inertial body 4 is supported on the fulcrum shaft 3 via an elastic member 8.

[0008]

[Operation] In the vibration damping device described above, when rotational vibration occurs in the sealed casing 1, this rotational vibration in one direction is transmitted from the fulcrum shaft 3 to the vibration plate 5, and the vibration plate 5
The unidirectional rotational vibration transmitted to the vibration transmitting member 6 is transmitted to the inertial body 4 as a reverse rotational vibration, thereby imparting an inertial force to the inertial body 4 in the opposite direction to that of the vibration plate 5. Therefore, when the rotational vibration direction of the sealed casing 1 changes from the one direction to the other direction, the rotational vibration of the vibrating plate 5 to which the rotational vibration in the other direction has been transmitted is transferred to the vibration transmission member 6. The inertial force applied to the inertial body 4 in the opposite direction can be forcibly canceled out and attenuated. As a result, no matter what frequency of rotational vibration occurs in the sealed casing 1, the rotational vibration can be reliably damped.

Furthermore, when the inertial body 4 is supported on the fulcrum shaft 3 via the elastic member 8, the elastic member 8 can prevent vibration transmission between the inertial body 4 and the fulcrum shaft 3. The elastic member 8 applies a brake to the inertial body 4, suppressing the generation of abnormal inertial force in the inertial body 4, and effectively damping the rotational vibration of the rotary compressor caused by the inertial body 4. .

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a horizontal rotary compressor as an example of a rotary compressor, which is driven in the axial direction inside an oblong sealed casing 1 by a motor 11 and a drive shaft 12 extending from the motor 11. A compression element 13 is arranged in parallel.

[0011] Furthermore, the rotary compressor described above is provided with a device on one axial side of the hermetic casing 1 to prevent rotational vibration of the entire compressor when vibration occurs due to load fluctuation of the compression element 13. To prevent this, the following vibration damping device 2 is provided.

That is, as shown in FIGS. 1 and 2, the vibration damping device 2 is configured to excite vibration having a non-circular cross section coaxially with the drive shaft 12 on the outer side of one axial side of the sealed casing 1. A fulcrum shaft 3 that continuously forms a plate fixing part 31 and an inertia body support part 32 with a circular cross section is integrally protruded, and a disc-shaped inertia body is attached to the inertia body support part 32 of the fulcrum shaft 3. 4 is rotatably supported, and the vibration plate fixing portion 31 of the fulcrum shaft 3
A disc-shaped vibration plate 5 that vibrates integrally with the rotational vibration of the casing 1 and has outer peripheral teeth 51 over the entire outer circumference is fixed to the outer periphery of the vibration plate. 5, and has a disc shape with a diameter smaller than the outer diameter of the casing 1, and is formed on the outer circumference of the inertial body 4, and protrudes in the axial direction toward the vibration plate 5. A portion 41 is formed, and inner peripheral teeth 42 are formed on the entire inner peripheral surface of this protruding portion 41.

A vibration transmitting member 6 is supported via a shaft rod 7 for transmitting the rotational vibration of the excitation plate 5 to the inertial body 4 so as to generate rotational vibration in the opposite direction to the inertial body 4. The vibration transmission member 6 uses a planetary gear having teeth 61 on its outer periphery that constantly mesh with the inner teeth 42 of the inertial body 4 and the outer teeth 51 of the vibrating plate 5. The member 6 transmits the rotational vibration of the vibrating plate 5 to the inertial body 4 side as a rotational vibration in the opposite direction. In each figure, reference numeral 33 indicates a member for preventing the vibrating plate 5 from coming off, which is provided at the outer end of the fulcrum shaft 3.

Further, the inertial body 4 is supported by an inertial body supporting portion 32 of the fulcrum shaft 3 via an elastic member 8, and the inertial body supporting portion 32 and the inner peripheral side of the inertial body 4 are connected to each other. A ring-shaped elastic member 8 made of rubber or the like is interposed between them.

Next, the operation of the vibration damping mechanism 2 constructed as above will be explained. First, due to load fluctuations of the compression element 13, the drive shaft 12 is removed from the closed casing 1.
When a rotational vibration centered on is generated and the rotational vibration is transmitted from the fulcrum shaft 3 to the vibration plate 5 in the direction of arrow A, for example, the vibration transmission meshes with the outer tooth 51 of the vibration plate 5. The member 6 is rotated in the direction of arrow B, and the inertial body 4 is rotated through the vibration transmission member 6 in the direction of arrow B, which is opposite to the rotation direction A of the vibration plate 5. An inertial force is applied to the inertial body 4. Therefore, when the direction of rotational vibration transmitted from the sealed casing 1 to the vibration plate 5 side changes from the direction A to the direction B, which is the opposite direction, the vibration transmission member 6 moves the inertial body 4 in the direction A. Although it attempts to rotate, this rotational vibration is attenuated by the inertial force in the direction B applied to the inertial body 4, and as a result, the vibration of the vibration plate 5 is also attenuated. As explained above, according to the vibration damping device 2, even if rotational vibration of any frequency occurs in the sealed casing 1, the rotational vibration is transmitted from the fulcrum shaft 3 through the vibration plate 5 and the vibration transmission member 6. The rotational vibration is forcibly transmitted to the inertial body 4, and the rotational vibration of the casing 1 can be reliably damped by the inertial force of the inertial body 4. Furthermore, as shown in each figure, the outer diameter of the inertial body 4 is made slightly smaller than the outer diameter of the sealed casing 1, and the inertial body 4 is attached to one side of the casing 1 in the axial direction via the fulcrum shaft 3. By supporting the vibration plate 5 and the vibration transmission member 6 within the inertial body 4, the entire compressor can be made compact. Furthermore, since the inertial body 4 is supported on the fulcrum shaft 3 via the elastic member 8, vibration transmission between the fulcrum shaft 3 and the inertial body 4 can be prevented by the elastic member 8; The member 8 brakes the rotation of the inertial body 4 due to inertia, suppresses generation of abnormal inertial force in the inertial body 4, and effectively reduces rotational vibration of the casing 1 side caused by the inertial body 4. Can be attenuated.

The inertial body 4 may be directly rotatably supported by the fulcrum shaft 3.

Further, as shown in FIG. 3, a cam body is used as the vibration transmission member 6, and the center portion of the cam body 6 is swingably supported by the inertial body 4 via a shaft rod 7. At the same time, each tip portion 62, 63 of the cam body 6 is connected to the inertial body 4.
The engaging portion 43 provided on the inner peripheral side of the discharge portion 41 and the vibration plate 5
When rotational vibration is transmitted to the vibration plate 5, the vibration plate 5
The entire cam body 6 is swung around the shaft rod 7 by the distal end portion 62 that is latched to the latching portion 52 of the body, and as a result of this oscillation, it is latched to the latching portion 43 of the inertial body 4. An inertial force in a direction opposite to that of the vibration plate 5 may be applied to the inertial body 4 at the tip 63 on the other side, and the rotational vibration on the casing 1 side may be damped by this inertial force.

Further, in the embodiment shown in FIGS. 1 and 2, a casing support member 10 provided on the lower side of the hermetic casing 1 is provided.
, 10 are fixed to a stationary member via a vibration isolating mechanism 9 including a coil spring 91, etc., and the casing 1 is elastically supported on the stationary member side by each vibration isolating mechanism 9, and the rotation generated on the casing 1 side is It is designed to dampen vibrations.

In the above embodiments, a horizontal type rotary compressor was shown, but the present invention is not limited to rotary compressors.
It can also be used in other types of compressors such as scroll type, and
It is also possible to apply it not only to horizontal compressors but also to vertical compressors.

[0020]

As explained above, in the vibration damping device of the present invention, the fulcrum shaft 3 is provided coaxially with the drive shaft 12 on the axial side surface of the sealed casing 1, and the inertial body 4 is rotated on the fulcrum shaft 3. A vibrating plate 5 is fixed to the fulcrum shaft 3, which is freely supported and vibrates integrally with the rotational vibration of the rotary compressor,
A vibration transmitting member 6 for forcibly transmitting the rotational vibration of the vibration plate 5 to the inertial body 4 so that it becomes a reverse rotational vibration is attached to the vibration plate 5.
and the inertial body 4. Therefore, when rotational vibration occurs in the sealed casing 1, this rotational vibration in one direction is transmitted from the fulcrum shaft 3 to the vibration plate 5, and the vibration plate The unidirectional rotational vibration transmitted to the vibration plate 5 is transmitted to the inertial body 4 side as a reverse rotational vibration through the vibration transmission member 6, and an inertial force is applied to the inertial body 4 in the opposite direction to that of the vibration plate 5. Therefore, when the rotational vibration direction of the sealed casing 1 changes from the one direction to the other direction, the rotational vibration of the vibrating plate 5 to which the rotational vibration in the other direction is transmitted is
The inertial force applied to the inertial body 4 in the opposite direction via the vibration transmitting member 6 can be forcibly canceled out and attenuated. Therefore, even though the overall structure is relatively small, no matter what frequency of rotational vibration occurs on the rotary compressor side,
This rotational vibration can be reliably damped.

Furthermore, by supporting the inertial body 4 on the fulcrum shaft 3 via the elastic member 8, the elastic member 8
can prevent vibration transmission between the inertial body 4 and the fulcrum shaft 3, and can also brake the inertial body 4 with the elastic member 8 to suppress generation of abnormal inertial force on the inertial body 4. Therefore, the rotational vibration of the rotary compressor caused by the inertial body 4 can be effectively damped.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a vibration damping device for a rotary compressor according to the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a side view showing another embodiment.

FIG. 4 is a side view showing an example of a conventional vibration damping device.

[Explanation of symbols] 1 Sealed casing 11 Motor 12 Drive shaft 13 Compression element 3 Fulcrum shaft 4 Inertial body 5 Vibration plate 6 Vibration transmission member 8 Elastic member

Claims (2)

[Claims] [Claim 1] A motor 11 is provided inside the sealed casing 1.
and a compression element 13 interlockingly connected to the drive shaft 12 of the motor 11, in which a fulcrum shaft 3 is connected to the drive shaft 12 on the axial side surface of the hermetic casing 1.
An inertial body 4 is rotatably supported on the fulcrum shaft 3, and an excitation plate 5 that vibrates integrally with the rotational vibration of the rotary compressor is fixed to the fulcrum shaft 3. Rotation characterized by interposing a vibration transmission member 6 between the vibrating plate 5 and the inertial body 4, which forcibly transmits the rotational vibration of the plate 5 to the inertial body 4 so that it becomes a reverse rotational vibration. Compressor vibration damping device. 2. The vibration damping device for a rotary compressor according to claim 1, wherein the inertial body 4 is supported on the fulcrum shaft 3 via an elastic member 8.