JP6289231B2 - Rotary compressor - Google Patents

Description

  The present invention relates to a rotary compressor used as a component of a refrigeration cycle employed in, for example, an air conditioner, a heat pump water heater, a refrigerator, and the like.

  Some conventional rotary compressors include a vibration reducing device in order to reduce vibration due to a change in rotational frequency. As such a conventional rotary type compressor, a tightly coiled connecting part having one end fixed to the outer peripheral part of a sealed case in which the electric motor part and the compression element part are fixedly housed, and the other end of the connecting part The thing provided with the fixed inertial body is proposed (refer patent document 1).

Japanese Patent No. 2553642 (Claim 1, FIG. 1)

  2. Description of the Related Art Conventionally, a rotary compressor has a longitudinal axis so that a rotating shaft that transmits a driving force of a motor (described as an electric motor portion in Patent Document 1) to a compression portion (described as a compression element portion in Patent Document 1) is along a vertical direction. There are cases in which a closed container (described as a sealed case in Patent Document 1) is installed with a vibration-proof structure. The refrigerant pipe (suction pipe and discharge pipe) of such a rotary compressor is connected to other refrigerant pipes (pipe attached to a housing such as an air conditioner) constituting the refrigeration cycle, and the rotary compressor When the is operated, the resonance determined by the weight of the rotary compressor and the spring constant of the vibration-proof structure that supports the hermetic container is at a low frequency, and vibration that causes the rotary compressor to fall occurs. When the operating speed of the rotary compressor (the number of rotations of the motor) is reduced and approaches the resonance frequency, the vibration displacement of the rotary compressor increases, and the vibration is generated from the refrigerant pipe connected to the rotary compressor. There was a problem that noise was radiated from the casing to the casing such as an air conditioner.

  The present invention has been made to solve the above-described problems, and an object thereof is to obtain a low-vibration rotary compressor.

The rotary compressor according to the present invention includes a hermetically sealed container in which a compressor, a motor, and a rotating shaft that transmits a driving force of the motor to the compressing part are housed, a vibration-proof structure that supports the hermetically sealed container, In a rotary compressor comprising a suction pipe and a discharge pipe connected to a container, wherein the rotary shaft is installed vertically so that the rotary shaft is along the vertical direction, a weight and one end is connected to the weight and the other end Including a vibration reducing device having an elastic member connected directly or indirectly to the sealed container, the vibration reducing device being provided at a position higher than the center of gravity of the rotary compressor , A vertical plane passing through the central point of the connection point with the suction pipe and the central point of the connection point between the airtight container and the discharge pipe is the plane B, the normal direction of the plane B is the V direction, and installation When the airtight container in a state is viewed in plan, the V direction In the case where the straight direction is defined as the H direction, in the vibration reducing device, the elastic member has a shape in which the spring constant in the V direction is different from the spring constant in the H direction, and the V direction has a different natural frequency. and a shall simultaneously reduce the vibrations in the H direction.

  According to the present invention, the vibration reduction device is mounted at a position higher than the center of gravity of the rotary compressor, so that even when the rotary compressor installed in a vertical position is supported by the vibration-proof structure, the rotation can be rotated. The vibration of the mold compressor can be prevented from increasing. For this reason, the present invention can suppress the vibration of the rotary compressor from being transferred from the refrigerant pipe to the casing of the air conditioner or the like even when the rotary compressor is operated at a reduced operating speed. It is possible to achieve an unprecedented remarkable effect that it is possible to suppress the radiation. In other words, the present invention can achieve an unprecedented remarkable effect that the vehicle can be operated at a reduced driving speed.

It is a top view which shows the rotary compressor by Embodiment 1 of this invention. It is a front view which shows the rotary compressor by Embodiment 1 of this invention. It is a longitudinal cross-sectional view which shows the rotary compressor by Embodiment 1 of this invention. It is a cross-sectional view which shows the vibration reduction apparatus by Embodiment 1 of this invention, and is AA sectional drawing of FIG. It is a longitudinal cross-sectional view which shows the vibration reduction apparatus by Embodiment 1 of this invention. 6 is a graph comparing the falling vibration D1 of the rotary compressor 100 when the vibration reducing device 9 is provided on the rotary compressor 100 and when the vibration reducing device 9 is not provided on the rotary compressor 100. . It is a front view of the conventional vibration reduction apparatus at the time of attaching the vibration reduction apparatus 9 to the center outer peripheral part of the rotary compressor 100 (more specifically, the airtight container 5). The graph which compared the fall vibration D1 of the rotary compressor 100 in the case where the vibration reduction apparatus 9 is provided in the upper part of the rotary compressor 100, and the case where the vibration reduction apparatus 9 is provided in the center outer periphery of the rotary compressor 100. It is. It is sectional drawing which shows another example of the vibration reduction apparatus of the rotary compressor by Embodiment 1 of this invention. It is a cross-sectional view which shows the vibration reduction apparatus by Embodiment 2 of this invention, and is AA sectional drawing of FIG. It is a cross-sectional view which shows another example of the vibration reduction apparatus by Embodiment 2 of this invention, and is AA sectional drawing of FIG. It is a top view which shows the rotary compressor by Embodiment 3 of this invention. It is a front view which shows the rotary compressor by Embodiment 3 of this invention. In the case where the weight 7 of the vibration reducing device 9 of the rotary compressor 100 is brought into contact with the sealed container 5 and in the case where the weight 7 of the vibration reducing device 9 of the rotary compressor 100 is not brought into contact with the sealed container 5, the rotary type is used. It is the graph which compared the fall vibration D1 of the compressor 100. FIG.

Embodiment 1 FIG.
FIG. 1 is a plan view showing a rotary compressor according to Embodiment 1 of the present invention. FIG. 2 is a front view showing the rotary compressor. FIG. 3 is a longitudinal sectional view showing the rotary compressor. 3 is a cross-sectional view taken along a plane including the axis of the rotary shaft 10 of the rotary compressor 100 and the center point 3a of the connection location between the sealed container 5 and the suction pipe 3 of FIG.
As shown in FIG. 3, the rotary compressor 100 according to the first embodiment includes a compressor 11 that compresses a refrigerant, a motor 14, and a rotating shaft 10 that transmits a driving force of the motor 14 to the compressor 11. Is provided with a hermetically sealed container 5. In the first embodiment, the rotor 12 of the motor 14 is fixed to the rotating shaft 10 connected to the compression unit 11 by shrink fitting, for example. The stator 13 of the motor 14 of the rotary compressor 100 is fixed to the inner surface of the sealed container 5 by, for example, shrink fitting or welding. In addition, a refrigerant pipe 4 (a suction pipe 3 that guides the refrigerant into the sealed container 5 and a discharge pipe 2 that causes the refrigerant to flow out of the sealed container 5) are connected to the sealed container 5.
In FIG. 3, a rotary compressor having a rotary compression unit is shown as an example of the rotary compressor 100.

  As shown in FIGS. 1 to 3, the rotary compressor 100 includes a vibration isolation structure 1 that supports, for example, a lower portion of the hermetic container 5. The rotary compressor 100 is installed vertically so that the rotary shaft 10 extends along the vertical direction, and the refrigerant pipe 4 of the rotary compressor 100 (the suction pipe 3 for guiding the refrigerant into the sealed container 5, the sealed container 5). A discharge pipe 2) through which the refrigerant flows out from the inside is connected to other refrigerant pipes (pipes attached to a housing such as an air conditioner) constituting the refrigeration cycle. In the first embodiment, the lower part of the rotary compressor 100 is supported by three vibration isolating structures 1. The anti-vibration structure 1 is generally a rubber or a metal spring.

Furthermore, the rotary compressor 100 according to the first embodiment is also provided with a vibration reducing device 9 in order to suppress the vibration generated when the rotary compressor 100 is operated as compared with the conventional one.
In the following, in order to facilitate understanding of the vibration reduction effect of the vibration reduction device 9, first, vibration generated when the rotary compressor 100 is operated will be described. Thereafter, a detailed configuration of the vibration reducing device 9 will be described. In the following, the center point of the connection point between the sealed container 5 and the suction pipe 3 is the center point 3a, the center point of the connection point between the sealed container 5 and the discharge pipe 2 is the center point 2a, and the center point 3a and the center point 2a. A vertical plane passing through is defined as plane B.

  When the rotary compressor 100 which is vertically placed in the vertical direction and the airtight container 5 is supported by the vibration isolating structure 1 is operated, the rotation C of the rotation direction shown in FIG. Further, due to the unbalance of the rotating part including the rotor 12 of the motor 14, a falling vibration that causes the rotary compressor 100 to tilt occurs. For example, when the lower part of the hermetic container 5 is supported by the vibration isolation structure 1, the resonance determined by the weight of the rotary compressor 100 and the spring constant of the vibration isolation structure 1 supporting the rotary compressor 100 is at a low frequency. When driving at a low speed, the falling vibrations D1 and D2 increase.

  Further, since the suction pipe 3 and the discharge pipe 2 of the rotary compressor 100 are connected to other refrigerant pipes (pipe attached to a housing such as an air conditioner) constituting the refrigeration cycle, the suction pipe 3 In addition, the movement of the rotary compressor 100 is restricted by the discharge pipe 2. For this reason, the falling vibration generated in the rotary compressor 100 includes the falling vibration D1 in the V direction, which is the normal direction of the plane B, and the H that is perpendicular to the V direction when the sealed container 5 in the installed state is viewed in plan view. It is largely divided into a direction falling vibration D2 (see FIG. 1). That is, in the rotary compressor 100 that is vertically placed in the vertical direction and the airtight container 5 is supported by the vibration isolating structure 1, specific falling vibrations D1 and D2 having different frequencies that resonate in the respective directions are generated.

  The above-described falling vibrations D1 and D2 are generally more restrained in the H-direction falling vibration D2 in which the suction pipe 3 and the discharge pipe 2 are arranged. For this reason, the falling vibration D1 in the V direction that is less constrained tends to be larger than the falling vibration D2 in the H direction. Further, the fall vibrations D1 and D2 include a fall vibration with the vicinity of the vibration isolation structure 1 below the rotary compressor 100 as an axis and a fall vibration with the vicinity of the center of gravity 6 of the rotary compressor 100 as an axis. Both falling vibrations are characterized in that the vibration displacement at the top of the rotary compressor 100 increases. Therefore, in the conventional rotary compressor, when the operation speed of the rotary compressor is lowered, the vibration of the rotary compressor increases due to these vibrations. That is, the conventional rotary compressor causes problems such as vibration transmitted from a refrigerant pipe connected to the rotary compressor to a casing (not shown), and noise from the casing increasing. That is, it is difficult for the conventional rotary compressor to operate the compressor at a low speed.

  Therefore, the rotary compressor 100 according to the first embodiment is provided with the vibration reducing device 9 including the weight 7 and the elastic member 8 at a position higher than the center of gravity 6 of the rotary compressor 100. In the first embodiment, a vibration reducing device 9 is provided on the top of the sealed container 5. In the vibration reducing device 9, the weight 7 is perpendicular to the plane B (the center point 3 a of the connection point between the sealed container 5 and the suction pipe 3 and the center point 2 a of the connection point between the sealed container 5 and the discharge pipe 2. It is provided so as to vibrate in the V direction, which is the normal direction of the flat plane. More specifically, the vibration reducing device 9 is configured as follows.

4 is a cross-sectional view showing the vibration reducing apparatus according to Embodiment 1 of the present invention, and is a cross-sectional view taken along the line AA of FIG. FIG. 5 is a longitudinal sectional view showing the vibration reducing device. 5 is a cross-sectional view of the vibration reducing device 9 shown in FIG. 4 taken along the center line.
The elastic member 8 of the vibration reducing device 9 is a columnar (cylindrical, prismatic, etc.) metal rod formed of, for example, spring steel or stainless steel. The weight 7 is, for example, a columnar member formed of a metal such as iron, stainless steel, or brass. The weight 7 is formed with an insertion hole for inserting the elastic member 8. One end of the elastic member is connected to the weight 7 by inserting the elastic member 8 into the insertion hole of the weight 7 by shrink fitting, for example.

  In the vibration reducing device 9 configured as described above, the other end of the elastic member 8 is connected to a position higher than the center of gravity 6 of the rotary compressor 100 in the sealed container 5. The vibration reducing device 9 is configured such that the weight 7 vibrates when the elastic member 8 is deformed. As described above, since the elastic member 8 of the vibration reducing device 9 according to the first embodiment is formed in a columnar shape, the structure vibrates in all directions in a plan view (when the rotary compressor 100 is observed from above). It has become. That is, in the vibration reducing device 9, the weight 7 is perpendicular to the plane B (the center point 3 a of the connection point between the sealed container 5 and the suction pipe 3 and the center point 2 a of the connection point between the sealed container 5 and the discharge pipe 2. It is provided so as to vibrate at least in the V direction which is the normal direction of the flat plane.

  Further, the vibration reducing device 9 configured as described above can change the resonance frequency of the vibration reducing device 9 by adjusting the weight of the weight 7 and the spring multiplier of the elastic member 8. For this reason, by fixing the vibration reducing device 9 to the rotary compressor 100, the vibration energy of the rotary compressor 100 is converted into energy that vibrates the weight 7 of the vibration reducing device 9. The vibration of the main body is reduced. Therefore, it is necessary to attach the vibration reducing device 9 to a position where the vibration displacement of the main body of the rotary compressor 100 is large so that the weight 7 vibrates in the direction in which the main body of the rotary compressor 100 vibrates.

  Here, the vibration reducing device 9 is installed at a position higher than the center of gravity 6 of the rotary compressor 100. However, this installation position is only a falling vibration with the anti-vibration structure 1 under the rotary compressor 100 as an axis. In addition, the vibration displacement due to the falling vibration about the center of gravity 6 of the compressor is also a large position. Therefore, an effect of reducing not only the falling vibration about the vibration isolating structure 1 at the lower part of the rotary compressor 100 but also the falling vibration about the center of gravity 6 of the rotary compressor 100 can be obtained. Further, the weight 7 is a normal line of the plane B (a vertical plane passing through the center point 3a of the connection point between the sealed container 5 and the suction pipe 3 and the center point 2a of the connection point between the sealed container 5 and the discharge pipe 2). By arranging the vibration reducing device 9 so as to vibrate at least in the V direction, which is the direction, the vibration is effectively reduced with respect to D1, which has a large falling vibration unique to the rotary compressor 100. The position of the center of gravity 6 of the rotary compressor 100 varies depending on the size, shape, and arrangement of each component, but is generally near the approximate center in the height direction of the rotary compressor 100 (more specifically, the sealed container 5). . Note that the falling vibrations D1 and D2 in the V direction and the H direction increase at different operating speeds, but both may occur simultaneously when the operating speeds are close. However, by setting the vibration reduction device 9 in different directions, the same reduction effect can be obtained for each vibration even if they occur simultaneously.

  Below, the verification result of the vibration reduction effect of the vibration reduction apparatus 9 which concerns on this Embodiment 1 is shown.

  FIG. 6 shows comparison of the falling vibration D1 of the rotary compressor 100 when the vibration reducing device 9 is provided on the rotary compressor 100 and when the vibration reducing device 9 is not provided on the rotary compressor 100. It is a graph. The horizontal axis represents the operating speed of the rotary compressor 100 (the number of rotations of the rotary shaft 10 for one second), and the vertical axis represents the relative value (dB) of the falling vibration D1 of the rotary compressor 100. Moreover, the broken line shows the rotary compressor 100 without the vibration reducing device 9, and the solid line shows the rotary compressor 100 with the vibration reducing device 9 provided on the upper part. Here, the spring constant of the elastic member 8 is adjusted so that the vibration reducing device 9 vibrates at 28 rps.

  In the case of the rotary compressor 100 not provided with the vibration reducing device 9, there was a peak of the falling vibration D1 in the vicinity of 28 rps. In the case of the rotary compressor 100 provided with the vibration reducing device 9 in the upper part, the falling vibration D1 at 28 rps is greatly reduced. Instead, a new increase in vibration occurred when operating at 38 rps, but it was reduced by 6.5 dB compared to the vibration level of 28 rps without the vibration reducing device 9, and reduced to less than 1/5 when converted to energy. Vibration was reduced to.

  As described above, when the vibration reducing device 9 is attached to the upper portion of the rotary compressor 100, that is, the upper portion of the outer shell of the sealed container 5, the vibration of the rotary compressor 100 is significantly reduced as compared with the case where the vibration reducing device 9 is not provided. The effect of reducing is obtained. Further, since the vibration reducing device 9 is installed on the upper part of the outer shell of the hermetic container 5, the vibration reducing device 9 can be easily installed and maintained even with a hermetic compressor.

  FIG. 7 is a front view of a conventional vibration reducing device when the vibration reducing device 9 is attached to the central outer peripheral portion of the rotary compressor 100 (more specifically, the sealed container 5). Further, FIG. 8 shows that the rotary compressor 100 is overturned when the vibration reducing device 9 is provided on the upper portion of the rotary compressor 100 and when the vibration reducing device 9 is provided on the central outer periphery of the rotary compressor 100. It is the graph which compared vibration D1. The horizontal axis represents the operating speed of the rotary compressor 100 (the number of rotations of the rotary shaft 10 for one second), and the vertical axis represents the relative value (dB) of the falling vibration D1 of the rotary compressor 100. Moreover, the broken line shows the rotary compressor 100 provided with the vibration reducing device 9 in the central outer peripheral portion, and the solid line shows the rotary compressor 100 provided with the vibration reducing device 9 in the upper part.

  Compared to the peak of 38 rps in the case of the rotary compressor 100 provided with the vibration reducing device 9 on the upper side, the falling vibration D1 in the vicinity of 28 rps in the case of the rotary compressor 100 provided with the vibration reducing device 9 in the central outer peripheral part is Increased by 4 dB. Even if the vibration reducing device 9 is the same, if the vibration reducing device 9 is not attached to a place where the falling vibration of the rotary compressor 100 is large, energy is not transmitted to the vibration reducing device 9 and the falling vibration of the rotary compressor 100 is not transmitted. This means that there is no reduction effect. In the case of the rotary compressor 100 in which the vibration reducing device 9 is provided on the outer periphery of the center, a new peak of the falling vibration D1 occurs even at 18 rps, which is considered to be vibration generated by coupling with the vibration reducing device 9. .

  As described above, the vibration reduction device 9 including the weight 7 and the elastic member 8 as in the first embodiment is installed at a position higher than the center of gravity 6 of the rotary compressor 100, thereby supporting the lower portion of the rotary compressor 100. In addition to the falling vibration about the vibration isolating structure 1 as an axis, the falling vibration about the center of gravity 6 can be reduced, so that acoustic radiation from the housing can be suppressed, and the rotary compressor 100 can be suppressed. Can be operated at a low speed.

  Moreover, by providing the vibration reducing device 9 on the upper part of the hermetic container 5 of the rotary compressor 100, the falling vibrations D1 and D2 of the rotary compressor 100 can be further reduced, and the acoustic radiation from the housing is suppressed. And the rotary compressor 100 can be operated at a low speed. Furthermore, assembly and maintenance of the rotary compressor 100 are facilitated.

  Further, the weight 7 is a normal line of the plane B (a vertical plane passing through the center point 3a of the connection point between the sealed container 5 and the suction pipe 3 and the center point 2a of the connection point between the sealed container 5 and the discharge pipe 2). By arranging the vibration reducing device 9 so as to vibrate at least in the V direction, which is the direction, it is possible to reduce the falling vibration D1 in the V direction where the vibration is large, so that it is possible to further suppress acoustic radiation from the housing. Thus, the rotary compressor 100 can be operated at a low speed.

  In the first embodiment, the rotary compressor 100 is a rotary compressor, but other rotary compressors such as a scroll compressor may be used. It goes without saying that the same effect can be obtained by installing the rotary compressor vertically so that the rotary shaft 10 is along the vertical direction.

  Further, although the weight 7 is made of metal in the first embodiment, it is not always necessary to be made of metal since it serves to add weight. The elastic member 8 is not necessarily made of metal, and may be an elastic material such as resin or rubber. Further, the connection between the weight 7 and the elastic member 8 may be appropriately determined depending on these materials, and both may be connected by screwing, adhesion, or the like.

  In addition, the vibration reducing device 9 is attached to the rotary compressor 100 by directly welding, brazing, or bonding the elastic member 8 to the sealed container 5 of the rotary compressor 100, or by sealing the elastic member 8 to the sealed container 5 of the rotary compressor 100. In some cases, a female screw is provided on the elastic member 8 and the elastic member 8 is cut off and fixed. In addition, as shown in FIG. 9, the elastic member 8 may be fixed to the base 15 and the base may be fixed to the sealed container 5 of the rotary compressor 100 by bonding, screwing, or the like. That is, the elastic member 8 may be indirectly connected to the sealed container 5 via the base 15.

  Further, although the vibration reducing device 9 has a reverse pendulum shape in which the weight 7 is supported by the elastic member 8, it is not necessary to stick to this shape as long as the vibration structure is constituted by the elastic member 8 and the weight 7.

Embodiment 2. FIG.
For example, the vibration reducing device 9 may be configured as follows. Configurations not described in the second embodiment are the same as those in the first embodiment, and the same configurations as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment.

10 is a transverse sectional view showing a vibration reducing apparatus according to Embodiment 2 of the present invention, and is a sectional view taken along line AA in FIG.
The elastic member 8 of the vibration reducing device 9 according to the second embodiment has a substantially elliptical cross section. The radial direction of the short radius is the plane B (a vertical plane passing through the center point 3a of the connection point between the sealed container 5 and the suction pipe 3 and the center point 2a of the connection point between the sealed container 5 and the discharge pipe 2). It is made to correspond to the V direction which is the normal line direction. That is, the elastic member 8 of the vibration reducing device 9 according to the second embodiment has a shape in which the spring constant in the V direction and the spring constant in the H direction are different. As a result, the weight 7 of the vibration reducing device 9 is soft to fall in the V direction and hard to fall in the H direction. By adjusting the elliptical radius of the elastic member 8 to the falling vibrations D1 and D2 peculiar to the compressor having the directivity generated by connecting the suction pipe 3 and the discharge pipe 2 to the rotary compressor 100, the rotary type The vibration reduction can be adjusted in each of the V direction and the H direction of the compressor 100, and it is not necessary to use separate elastic members 8.

  As described above, by configuring the vibration reducing device 9 as in the second embodiment, the falling vibration of the rotary compressor 100 with respect to each direction can be effectively reduced with the compact vibration reducing device 9. Even when the rotary compressor 100 is operated at a low speed, an increase in vibration of the rotary compressor 100 can be suppressed to a small level. Therefore, vibration transmitted from the refrigerant pipe 4 to the housing does not increase, and noise radiated from the housing. Can also be reduced.

  In FIG. 10, the cross-sectional shape of the elastic member is an ellipse, but it goes without saying that the same effect can be obtained if the cross-sectional shape is rectangular and the thickness is changed between the V direction and the H direction as shown in FIG.

Embodiment 3 FIG.
The vibration reducing device 9 may be attached to the sealed container 5 as follows. Configurations that are not described in the third embodiment are the same as those in the first or second embodiment, and the same reference numerals are given to the same configurations as those in the first and second embodiments.

FIG. 12 is a plan view showing a rotary compressor according to the third embodiment of the present invention. FIG. 13 is a front view showing the rotary compressor.
The vibration reducing device 9 of the rotary compressor 100 according to the third embodiment is attached to the upper part of the sealed container 5 so as to vibrate in the horizontal direction. Specifically, the weight 7 is a method in which the weight B is a plane B (a vertical plane passing through the center point 3a of the connection point between the sealed container 5 and the suction pipe 3 and the center point 2a of the connection point between the sealed container 5 and the discharge pipe 2). The vibration reducing device 9 is arranged so as to vibrate only in the V direction, which is the linear direction. Further, in the vibration reducing device 9 according to the third embodiment, the weight 7 is disposed in contact with the sealed container 5.
When the vibration reduction device 9 according to the third embodiment is viewed in plan view, the weight 7 vibrates in an arc shape strictly along the V direction. In the third embodiment, such a case is also referred to as vibrating in the V direction.

  FIG. 14 shows a case where the weight 7 of the vibration reducing device 9 of the rotary compressor 100 is brought into contact with the sealed container 5 and a case where the weight 7 of the vibration reducing device 9 of the rotary compressor 100 is not brought into contact with the sealed container 5. FIG. 3 is a graph comparing the falling vibration D1 of the rotary compressor 100. FIG. The horizontal axis represents the operating speed of the rotary compressor 100 (the number of rotations of the rotary shaft 10 for one second), and the vertical axis represents the relative value (dB) of the falling vibration D1 of the rotary compressor 100. The broken line indicates the rotary compressor 100 in which the weight 7 of the vibration reducing device 9 is not brought into contact with the sealed container 5, and the solid line indicates the rotary compressor 100 in which the weight 7 of the vibration reducing device 9 is brought into contact with the sealed container 5. ing.

  When the weight 7 of the vibration reducing device 9 is not in contact with the sealed container 5, the peak of the vibration D1 collapsed in the vicinity of 38 rps. When the weight 7 of the vibration reducing device 9 is in contact with the sealed container 5, the fall vibration D1 of 38 rps is reduced by 7 dB. When the weight 7 of the vibration reducing device 9 is attached in contact with the sealed container 5 as described above, an effect of significantly reducing the vibration of the rotary compressor 100 can be obtained as compared with the case where the vibration reducing device 9 is not provided.

  In the third embodiment, the elastic member 8 is a metal rod whose axis is arranged in the H direction, and the base 15 to which the elastic member 8 is fixed is fixed to the upper portion of the rotary compressor 100. As a result, the vibration energy of the rotary compressor 100 is converted into vibrating the weight 7 of the vibration reducing device 9, and the tilting vibration of the rotary compressor 100 in the V direction is reduced. At this time, when the weight 7 comes into contact with the outer shell of the rotary compressor 100 and causes friction, a part of vibration energy of the weight 7 is converted into heat energy due to friction, and vibration of the weight 7 is also reduced. .

  As described above, in the rotary compressor 100 configured as in the third embodiment, the weight 7 has the plane B (the center point 3a of the connection point between the sealed container 5 and the suction pipe 3, the sealed container 5 and the discharge pipe). Since the vibration reducing device 9 is arranged so as to vibrate only in the V direction, which is the normal direction of the vertical plane passing through the center point 2a of the connection point to the connection point 2, the falling vibration D1 in the V direction where the vibration is large. Reduce. Thereby, it is possible to suppress acoustic radiation from the housing, and the rotary compressor 100 can be operated at a low speed. Further, since the vibration D1 is limited to the vibration D1 in the large normal direction V that is peculiar to the rotary compressor 100, the form of the vibration reducing device 9 becomes free and the design becomes easy. Further, by arranging the weight 7 of the vibration reducing device 9 in contact with the rotary compressor 100, the vibration energy of the rotary compressor 100 is dissipated by friction with the weight 7 of the vibration reducing device 9, and the rotary compressor 100 and the vibration of the vibration reducing device 9 can be reduced. Needless to say, if the surface roughness of the contact surface between the sealed container 5 and the weight 7 is increased to easily cause friction, the same effect can be further improved.

  DESCRIPTION OF SYMBOLS 1 Anti-vibration structure, 2 discharge piping, 2a The central point of the connection location of the airtight container 5 and the discharge piping 2, 3 Suction piping, 3a The central point of the connection location of the airtight container 5 and the suction piping 3, 4 Refrigerant piping, 5 Airtight container, 6 center of gravity, 7 weights, 8 elastic member, 9 vibration reduction device, 10 rotation shaft, 11 compression section, 12 rotor, 13 stator, 14 motor, 15 base, 100 rotary compressor, B plane, C rotation direction Vibration, D1 falling vibration, D2 falling vibration, H direction (H direction perpendicular to V direction when airtight container 5 in plan view is viewed in plan), V direction (normal direction of plane B).

Claims (2)

A hermetically sealed container containing a compression unit, a motor, and a rotating shaft that transmits the driving force of the motor to the compression unit;
An anti-vibration structure for supporting the sealed container;
A suction pipe and a discharge pipe connected to the sealed container;
With
In the rotary compressor installed vertically so that the rotation axis is along the vertical direction,
Comprising a vibration reducing device having a weight and an elastic member having one end connected to the weight and the other end connected directly or indirectly to the sealed container;
The vibration reducing device is provided at a position higher than the center of gravity of the rotary compressor ,
A vertical plane passing through the central point of the connection point between the closed container and the suction pipe and the central point of the connection point between the closed container and the discharge pipe is a plane B, and a normal direction of the plane B is a V direction. When the H direction is defined as a direction perpendicular to the V direction when the sealed container in an installed state is viewed in plan view,
The vibration damping system, the elastic member is a said V direction of the spring constant and the H direction of the spring constant and different shapes, Rukoto simultaneously reduce the vibrations in the V direction and the H direction different natural frequency Rotating compressor characterized by   The rotary compressor according to claim 1, wherein the vibration reducing device is attached to an upper portion of the sealed container.

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