KR20060011169A - A compressing portion supporting structure of rotary compressor - Google Patents

Abstract

The present invention relates to a compression mechanism support structure of a rotary compressor. The present invention provides a compression chamber (33) in which a working fluid is compressed in a rotary compressor including a compression mechanism (30) and a motor (60) installed in a sealed space (22) inside a sealed container (20). The upper and lower portions of the cylinder 32 and the upper and lower portions of the cylinder 32 to shield the upper and lower portions of the compression chamber 33 and to rotatably support the rotating shaft 38 rotated by the motor unit 60. The upper and lower bearings 34 and 36 and the cylinder 32 and the upper and lower bearings 34 and 36 are installed on one side and are fastened to the inside of the hermetic container 20 so that the cylinder 32 and the upper and lower bearings 34 and 36 are fastened. 36 and a silencer 50 for removing noise and pulsation of the working fluid compressed and discharged from the compression chamber 33 at the same time. According to the present invention, the compression mechanism of the rotary compressor is more firmly and surely supported, the contact precision of the relatively rotating portion of the compression mechanism is relatively high, and the noise and pulsation of the working fluid can be minimized.

Rotary compressor, compressor section, support, silencer

Description

Compressor portion supporting structure of rotary compressor

1 is a cross-sectional view showing the configuration of a typical rotary compressor.

Figure 2 is a perspective view showing the main structure of the compression mechanism according to the prior art.

Figure 3 is a cross-sectional view showing the internal configuration of a rotary stabilizer employing a preferred embodiment of the compression mechanism support structure according to the present invention.

Figure 4 is a perspective view showing the main portion of the embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

20: airtight container 22: airtight space

24: suction pipe 26: accumulator

28: discharge tube 30: compressor section

32: cylinder 33: compression chamber

34: upper bearing 36: lower bearing

38: rotating shaft 40: rolling piston

42: vane 50: silencer

52: fastening portion 60: motor portion

62: stator 64: rotor

The present invention relates to a rotary compressor, and more particularly, to a compression mechanism support structure of a rotary compressor for installing a compression mechanism for compressing a working fluid of a heat exchange cycle in a rotary container.

1 shows the internal configuration of a typical rotary compressor in cross section. According to this, the compression mechanism is provided in the inner lower side of the sealed container 1 to form a sealed space therein. That is, the cylinder 2 is fixed to the inside lower side of the said airtight container 1. The compression chamber 3 is formed inside the cylinder 2. The upper and lower parts of the compression chamber 3 are shielded by upper and lower bearings 4 and 4 '. The upper and lower bearings 4, 4 ′ are fastened to the upper and lower portions of the cylinder 2 by bolts 5, respectively.

The rotary shaft 6 is rotatably supported at its lower end by the lower bearing 4 ', and a portion protruding upward of the cylinder 2 is rotatably supported through the upper bearing 4. An eccentric portion 6 ′ is provided at a portion of the rotary shaft 6 corresponding to the inside of the compression chamber 3. The eccentric 6 'has its geometric center spaced a predetermined distance from the center of rotation of the axis of rotation 6.

The driving force for the rotation of the rotary shaft 6 is provided by the motor unit (9). The motor unit 9 is provided on the upper portion of the cylinder 2, which is rotated by the electromagnetic interaction between the stator 8 and the stator 8 fixed to the inner upper portion of the sealed container 1. It consists of an electron 9. The rotor 9 penetrates the center of the stator 8 and is installed on the rotating shaft 6 such that its outer peripheral surface has a predetermined distance from the inner peripheral surface of the stator 8. The rotary shaft 6 is press-fitted to the center of rotation of the rotor (9).

On the other hand, the suction tube 10 is provided to penetrate through one side of the sealed container (1). The suction pipe 10 is connected to the accumulator 11 to supply a working fluid to the compression chamber (3). The discharge tube 12 is provided at the top of the sealed container (1). The discharge tube 12 is a portion for discharging the working fluid compressed in the compression chamber 3 to the outside.

The rolling piston 13 is press-fitted to the eccentric portion 6 'of the rotary shaft 6. The rolling piston 13 is press-fitted around the outer circumferential surface of the eccentric portion 6 'and serves to compress the working fluid in the compression chamber 3.

The silencer 14 is installed on the upper bearing 4 to remove noise and pulsation of the working fluid compressed and discharged from the compression chamber 3. The working fluid from the compression chamber 3 is delivered to the silencer 14 through a discharge valve (not shown). Reference numeral 15 in the figure is a balance weight to hold the center of rotation of the rotary shaft (6).

However, the rotary compressor of the above configuration has the following problems.

The cylinder 2 constituting the compression mechanism is fixed by welding to the inside of the hermetic container. However, when the cylinder 2 is fixed to the sealed container 1 by welding, deformation occurs in the cylinder 2. When deformation occurs in the cylinder 2, the shape of the compression chamber 3 is also deformed. Therefore, a gap occurs between the inner surface of the compression chamber 3 and the outer surface of the rolling piston 13, so that the compression of the working fluid is not properly performed.

In order to solve this, as shown in FIG. 2, a fastening portion 4m is formed at the edge of the upper bearing 4 so as to be fastened by welding to the inner surface of the sealed container 1. The fastening portion 4m is formed in a ring shape so as to protrude in the centrifugal direction more than the outer surface of the cylinder 2, and is welded to the sealed container 1 to be fastened.

However, even in the configuration in which the upper bearing 4 is welded and fastened to the sealed container 1, the upper bearing 4 may not accurately support the rotation shaft 6 due to deformation.

And, in general, the upper bearing 4 is made by forming the shape by casting work, and is manufactured by precisely processing the part in contact with the rotating shaft (6). Therefore, when the size of the upper bearing 4 is relatively large, there is a problem that the manufacturing work is difficult and the manufacturing cost is high.

In addition, the upper bearing (4) made by casting work has a problem in that the bonding state with the closed container (1) is relatively poor in weldability due to the properties of the material.

Accordingly, an object of the present invention is to solve the problems of the prior art as described above, to support the compression mechanism in the rotary compressor using a silencer in a sealed container.

Another object of the present invention is to allow the compression mechanism of the rota compressor to be more firmly supported in the sealed container.

According to a feature of the present invention for achieving the object as described above, the present invention is a sealed container is formed in the sealed space and the appearance therein, and the motor unit is installed in the sealed container and provides a driving force; In the rotary compressor comprising a compressor mechanism for driving the motor fluid to compress the working fluid, a silencer provided in the compression mechanism to remove the pulsation and noise of the compressed working fluid is fastened to the inner surface of the sealed container To support the compression mechanism in a sealed container.

A fastening part which is fastened by welding is formed on an inner surface of the sealed container surrounding the outer circumferential surface of the silencer.

A plurality of fastening portions surrounding the outer circumferential surface of the muffler are formed to protrude in the centrifugal direction, and the fastening portions are welded to the inner surface of the sealed container by welding.

The silencer is installed in the cylinder to form a part of the compression chamber and is installed in the upper bearing rotatably supporting the rotating shaft rotated by the motor unit.

According to the structure of the compressor section of the rotary compressor according to the present invention having such a configuration, the compressor section of the rotary compressor is more firmly and securely supported, the contact precision of the relatively rotating part of the compressor section is relatively high, and the noise of the working fluid is increased. There is an advantage that can minimize the pulsation.

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the compression mechanism support structure of the rotary compressor according to the present invention will be described in detail.

Figure 3 is a cross-sectional view showing the internal configuration of the rotary shaft shaft adopting a preferred embodiment of the compression mechanism support structure according to the present invention, Figure 4 is a perspective view showing the main configuration of the embodiment of the present invention.

As shown in these figures, the sealed container 20 forms the appearance of the rotary compressor. The airtight container 20 is formed of a container body 21 that is formed to be substantially vertically long in a cylindrical shape, and an upper and lower cover 21 'that shields the upper and lower portions of the container body 21. The sealed space 22 is formed in the sealed container 20.

The suction tube 24 is provided to penetrate through one side of the lower end of the sealed container 20. The suction pipe 24 is connected to the accumulator 26. The accumulator 26 serves to ensure that only the working fluid in the gaseous state is transferred to the rotary compressor among the working fluid flowing in the heat exchange cycle. The discharge tube 28 is provided at the upper end of the sealed container 20 to communicate with the sealed space 22. The discharge pipe 28 discharges the working fluid compressed by the rotary compressor to the outside of the sealed container 20 to be transferred to other components of the heat exchange cycle.

The compression mechanism 30 is provided in the lower side of the sealed container 20. The compression mechanism 30 is a portion where the working fluid is compressed. The compression mechanism 30 is provided with a cylinder (32). The compression chamber 33 is formed inside the cylinder 32. Upper and lower bearings 34 and 36 are installed on the upper and lower surfaces of the cylinder 30, respectively. More specifically, the upper bearing 34 and the lower bearing 36 shield the upper and lower portions of the compression chamber 33. The upper bearing 34 and the lower bearing 36 are fastened to the cylinder 30 by bolts 37 to form upper and lower portions of the compression chamber 33.                     

The rotating shaft 38 is rotatably supported by the upper bearing 35 and the lower bearing 36. The rotating shaft 38 penetrates through the compression chamber 33 of the cylinder 32. An eccentric portion 39 is formed at a portion of the rotary shaft 38 corresponding to the compression chamber 33. The eccentric 39 is formed such that its geometric center axis is spaced apart from the center of rotation of the rotation axis 38.

The rolling piston 40 is installed on the eccentric portion 39 of the rotating shaft 38. The rolling piston 40 is installed around the outer surface of the eccentric portion 39. The rolling piston 40 is rotated in a state in which one outer surface of the rolling piston 40 is in contact with the inner surface of the compression chamber 33 to compress the working fluid.

The vane 42 is provided in the compression chamber 33. The vane 42 has a tip protruding elastically into the compression chamber 33 inside the cylinder 32 so that the tip contacts the rolling piston 40 so that the compression chamber 33 is connected to the high pressure side. Partitioning to the low pressure side allows compression of the working fluid.

The silencer 50 is fastened on the upper bearing 34 provided on the upper portion of the cylinder 32. The silencer 50 serves to remove pulsation and noise of the working fluid compressed and discharged from the compression chamber 33. A passage through which the working fluid flows is formed in the silencer 50. The working fluid that has passed through the silencer 50 is discharged into the sealed container 20 and is transferred to the outside through the discharge pipe 28 on the top of the sealed container 20. Such a silencer 50 is generally made of steel.

A plurality of fastening parts 52 surrounding the outer circumferential surface of the silencer 50 are provided. The fastening part 52 is a part fastened to the inner wall of the sealed container 20 by welding or the like. In this embodiment, as shown in Figure 4, the fastening portion 52 is provided to extend in three places in the centrifugal direction, but is not necessarily so. For example, it may be formed in a ring shape around the outer circumferential surface as in the conventional upper bearing.

Since the fastening part 52 is fastened to the inner surface of the airtight container 20, the compression mechanism part 30 is substantially supported by the airtight container 20. That is, the silencer 50 is fastened to the upper bearing 34 and the upper bearing 34 is fastened to the cylinder 32. Of course, the silencer 50 may be fastened to the cylinder 32 together with the upper bearing 34.

The rotary shaft 38 extends long to the upper portion of the upper bearing 34 that penetrates through the center of the silencer 50. The rotating shaft 38 extending above the upper bearing 34 is connected to the motor unit 60.

The motor unit 60 is composed of a stator 62 and a rotor 64. The stator 62 is fixed to the inside of the hermetic container 20 and the rotor 62 of the stator 62. It is installed inside the stator 62 to penetrate the center. The rotor 64 is rotated by electromagnetic interaction with the stator 62. The rotating shaft 38 is press-fitted to the center of rotation of the rotor 64. Thus, the rotating shaft 38 rotates with the rotation of the rotor 64.

Hereinafter, the operation of the compression mechanism support structure of the rotary compressor according to the present invention having the configuration as described above will be described in detail.

First, the operation of the rotary compressor of the present invention will be briefly described. When the rotary compressor is driven, the rotor 64 of the motor unit 60 is rotated. Thus, the rotating shaft 38 rotates integrally with the rotor 64. The rolling piston 40 rotates inside the compression chamber 33 by the rotation of the rotation shaft 38.

As the rolling piston 40 rotates, the volume of the high pressure side and the low pressure side inside the compression chamber 33 partitioned by the vanes 42 is changed to compress the working fluid. The compressed working fluid is transferred into the silencer 50 through the discharge valve, and pulsation and noise are reduced in the silencer 50. The working fluid that has passed through the silencer 50 is moved to the inner upper portion of the sealed container 20 and exits through the discharge pipe 28.

In the rotary compressor of the present invention as described above, the silencer 50 has a fastening part 52 formed therein and is fastened to the closed container 20 by welding or the like. Therefore, the compression mechanism 30 may be supported by the silencer 50 in the hermetic container 20. This is because the silencer 50 is fastened on the upper bearing 34 mounted on the upper portion of the cylinder 32.

Here, the silencer 50 may be designed to have an outer diameter corresponding to the inner diameter of the hermetic container 20. In other words, the size of the silencer 50 can be relatively increased.

In addition, the fastening part 52 of the silencer 50 to the closed container 20 is generally made by welding. When the fastening part 52 of the silencer 50 is fastened by welding, Deformation may occur in the silencer 50 by the heat generated. However, even if the deformation occurs in the silencer 50, there is no portion that rotates relative to the silencer 50 does not affect the performance of the compressor.

The rights of the present invention are not limited to the embodiments described above, but are defined by the claims, and those skilled in the art can make various modifications and adaptations within the scope of the claims. It is self-evident.

For example, the external appearance of the silencer 50 is not necessarily limited to the illustrated embodiment, and may be any configuration that can be fastened to the inner surface of the sealed container 20.

In addition, the silencer 50 is not necessarily installed in the upper bearing 34, but may be installed in the cylinder 32 or the lower bearing 36.

In the compression mechanism support structure of the rotary compressor according to the present invention as described in detail above, the following effects can be obtained.

First, in the present invention, the silencer is fastened to the airtight container by welding. Here, the silencer is generally made of steel. Therefore, the weldability is relatively good compared to the parts made by the casting work, so that the silencer, that is, the compression mechanism, can be more firmly fastened and tightly supported in the sealed container.

In particular, in the case of the muffler, even if the welding is performed for fastening to the sealed container and deformation due to the heat of welding occurs, there is no component that rotates or slides relative to the muffler, and thus does not affect the performance of the compressor.

In the present invention, the size of the silencer can be designed to correspond to the inner diameter of the sealed container. Therefore, the flow path formed inside the silencer can be relatively long, and the noise and pulsation reduction effect can be increased. In addition, the thickness of the silencer itself can be relatively thick, thereby minimizing noise transmitted to the outside.

In addition, since the compression mechanism is relatively large so as to be supported in a sealed container, it is possible to reduce the size of other components, such as cylinders or upper bearings, which require relatively precise processing, to reduce the manufacturing cost.

Claims (4)

An airtight container having an airtight space formed therein and forming an exterior; A motor unit installed inside the sealed container and providing a driving force; In the rotary compressor comprising a compressor mechanism for driving the motor to compress the working fluid, Compressor support portion of the rotary compressor, characterized in that the silencer provided in the compression mechanism to remove the pulsation and noise of the compressed working fluid is fastened to the inner surface of the sealed container to support the compression mechanism in the sealed container. According to claim 1, Compressor sphere support structure of the rotary compressor, characterized in that the fastening portion which is fastened by welding is formed on the inner surface of the sealed container surrounding the outer peripheral surface of the silencer. The compressor structure of claim 1, wherein a plurality of fastening portions surrounding the outer circumferential surface of the silencer are formed to protrude in the centrifugal direction, and the fastening portions are welded to the inner surface of the sealed container by welding. [4] The rotary compressor of claim 2 or 3, wherein the silencer is installed in the upper bearing which is installed in the cylinder to form a part of the compression chamber and rotatably supports the rotating shaft rotated by the motor unit. Compressor support structure.

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