KR101366563B1 - A reciprocating compressor - Google Patents

Abstract

The present invention relates to a reciprocating compressor, and an object of the present invention is to provide a reciprocating compressor provided to effectively compensate for the rotational imbalance of the rotating shaft according to the compression action of the refrigerant regardless of the change in the speed of the rotating shaft.

To this end, the reciprocating compressor according to the present invention has a stator, a rotor provided to rotate in electrical interaction with the stator, and eccentric to be eccentrically rotated at one end by being pressed into the center of the rotor to rotate together with the rotor. A rotation shaft provided with a shaft, a piston connected to the eccentric shaft through a connecting rod to reciprocate linearly during the rotation of the rotation shaft, and compressing the refrigerant, and a weight balance device provided to compensate for the rotational imbalance of the rotation shaft. The weight balance device includes a mass body provided to flow radially from the axial center direction of the rotation shaft by centrifugal force as the rotation speed of the rotation shaft increases, and an elastic member provided to elastically support the mass body in the axial direction of the rotation shaft. do.

Description

Reciprocating Compressor {A RECIPROCATING COMPRESSOR}

1 is a cross-sectional view showing the overall structure of a reciprocating compressor according to an embodiment of the present invention.

Figure 2 is a perspective view showing the structure of a rotor equipped with a weight balance device in the reciprocating compressor according to an embodiment of the present invention.

Figure 3 is a perspective view showing the structure of a press-work pressed to form the receiving member of the weight balance device in the reciprocating compressor according to an embodiment of the present invention.

4 and 5 are perspective views sequentially illustrating a process of allowing the weight balance device to be installed in the rotor while forming the receiving member with the press of FIG. 3.

6 is a plan view illustrating the operation of the weight balance device in the reciprocating compressor according to the preferred embodiment of the present invention, and illustrates a case in which the rotating shaft rotates at a low speed.

7 is a plan view illustrating the operation of the weight balance device in the reciprocating compressor according to the preferred embodiment of the present invention, and illustrates a case in which the rotating shaft rotates at a high speed.

Description of the Related Art [0002]

32: rotor 50: axis of rotation

61, 62: weight balance device 70: mass

71: guide protrusion 80: receiving member

81: elastic member 82: top plate

83: lower plate portion 84, 85: side plate portion

86: mounting portion 87: guide portion

90: press object 91: elastic support member forming portion

92: upper plate forming portion 93: lower plate forming portion

94,95: side plate forming part

The present invention relates to a reciprocating compressor, and more particularly, to a reciprocating compressor provided to effectively compensate for the rotational imbalance of the rotating shaft according to the compression action of the refrigerant regardless of the speed change of the rotating shaft.

In general, a compressor employed in a refrigeration cycle such as a refrigerator or an air conditioner forms an appearance through a sealed container, and the inside of the sealed container provides a drive unit for providing a compression driving force of the refrigerant, and receives a driving force of the drive unit to compress the refrigerant. A compression unit is provided that performs the action.

As the drive unit, a motor having a rotor provided to rotate in an electromagnetic interaction with the stator and the stator is generally employed, and the driving force of the drive unit is transmitted to the compression unit through a rotating shaft, and the compressor is compressed. According to the shape of the unit is divided into a rotary type and a reciprocating type, the reciprocating compressor is provided with a piston for linear reciprocating movement inside the compression chamber as a compression unit as shown in FIG.

In addition, one end of the rotating shaft is provided with an eccentric shaft for eccentric rotation when the rotating shaft is rotated so that the rotational movement of the rotary shaft is converted into a linear reciprocating motion of the piston, and a connecting rod is installed between the eccentric shaft and the piston.

Therefore, the reciprocating compressor having such a structure causes the eccentric shaft provided at one end of the rotating shaft to be eccentrically rotated when the rotary shaft is rotated by the driving unit so that the piston connected through the eccentric shaft and the connecting rod is linearly reciprocated in the compression chamber. Through this, the compression of the refrigerant is performed.

When the refrigerant is compressed, the eccentric rotation of the eccentric shaft portion and the linear reciprocating motion of the piston formed in a direction perpendicular to the rotation axis cause the rotation shaft to rotate in an unbalanced state, causing vibration or noise. To compensate for the rotational imbalance of the rotating shaft, a weight balance is installed at one side of the upper and lower portions of the rotor or the rotating shaft.

The weight balance is installed on the rotating shaft is provided integrally with the rotating shaft is provided to extend in the opposite direction to the eccentric shaft portion in the lower portion of the eccentric shaft portion, the weight balance direction facing each other on the upper and lower sides of the rotor It is fastened to the position.

However, in the case of such a conventional reciprocating compressor, the weight balance is provided in a fixed type with a predetermined mass in consideration of when the speed of the rotating shaft is within a certain range. When the deviation from within a certain range, the centrifugal force of the eccentric shaft portion or the linear reciprocating force of the piston is changed, when the degree of rotational imbalance of the rotating shaft is changed, there is a problem that can not effectively compensate for the rotational imbalance of the rotating shaft.

The present invention is to solve such a problem, it is an object of the present invention to provide a reciprocating compressor provided to effectively compensate for the rotational imbalance of the rotating shaft according to the compression action of the refrigerant regardless of the change in the speed of the rotating shaft.

In order to achieve this object, a reciprocating compressor according to the present invention has a stator, a rotor provided to rotate in electrical interaction with the stator, and is pressed into the center of the rotor so as to rotate together with the rotor. A rotation shaft provided with an eccentric shaft portion for eccentric rotation, a piston connected through the eccentric shaft portion and a connecting rod to linearly reciprocate and compress refrigerant when the rotation shaft rotates, and a weight balance device provided to compensate for rotational imbalance of the rotation shaft. The weight balance device includes: a mass body provided to flow in a radial direction from an axis center of the rotation shaft by centrifugal force as the rotation speed of the rotation shaft increases, and an elastic member provided to elastically support the mass body in the axial center direction of the rotation shaft. And a member.

And the weight balance device is characterized in that it comprises a receiving member for receiving the mass and the elastic member is provided integrally.

In addition, the receiving member is formed by forming a receiving space for receiving the mass body in the state of being processed into a plate-shaped press and the elastic member is provided to be bent so as to come to a position that can elastically support the mass body in the axial direction of the rotating shaft. It features.

In addition, it characterized in that it further comprises a departure prevention unit for guiding the flow direction of the mass in the radial direction and at the same time to prevent the separation of the mass.

In addition, the detachment preventing unit includes a guide protrusion provided on any one of the mass body and the receiving member, and a guide portion provided along the radial direction of the rotating shaft to insert the guide protrusion and provided on the other of the mass body and the receiving member. Characterized in that.

In addition, the guide portion is characterized in that the groove.

In addition, the guide portion is characterized in that the hole.

In addition, the guide protrusion is formed in the mass body, characterized in that the guide portion is a long hole type hole provided in the receiving member.

In addition, the receiving member is characterized in that the mounting portion for mounting the receiving member is provided.

In addition, the weight balance device is characterized in that provided on at least one of the rotation axis between the eccentric shaft portion and the rotor, and both ends of the rotor.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment according to the present invention will be described in detail.

As shown in FIG. 1, the reciprocating compressor according to the present exemplary embodiment includes a sealed container 10 formed by combining an upper container 10a and a lower container 10b, and one side of the sealed container 10. The other side is provided with a suction pipe 11 for guiding the external refrigerant into the hermetic container 10 and a discharge tube 12 for guiding the refrigerant compressed in the hermetic container 10 to the outside of the hermetic container 10, respectively.

In the hermetic container 10, a compression unit 20 for compressing a refrigerant is provided, and a driving unit 30 for providing a compression driving force according to the compression of the refrigerant is provided. The compression unit 20 and the driving unit ( 30 is installed through the frame 40.

The drive unit 30 includes a stator 31 fixed to the lower outer side of the frame 40 and a rotor 32 provided inside the stator 31 to rotate by electromagnetic interaction with the stator 31. It is provided with a motor.

In addition, the compression unit 20 is a cylinder 21 and the compression chamber 21a integrally formed with the frame 40 on one side of the upper portion of the hollow portion of the frame 40 to form a compression chamber 21a for compressing the refrigerant. Piston 22 which performs a reciprocating action of the refrigerant and linearly reciprocates in the inside, and is coupled to one end of the cylinder 21 to seal the compression chamber 21a, and the refrigerant discharge chamber 23a and the refrigerant suction chamber 23b. It is provided between the cylinder head 23 and the cylinder 21 and the cylinder head 23 formed so as to be mutually partitioned, and is sucked into the compression chamber 21a from the refrigerant suction chamber 23b or the refrigerant discharge chamber from the compression chamber 21a. And a valve device 24 for interrupting the flow of the refrigerant discharged to the 23a. Here, the refrigerant suction chamber 23b guides the refrigerant transferred into the sealed container 10 through the suction tube 11 to the compression chamber 21a, and the refrigerant discharge chamber 23a is the discharge tube 12. The reference numeral 13 is a suction muffler for guiding the refrigerant introduced into the sealed container 11 through the suction pipe 11 to the refrigerant suction chamber 23b in a state where the pressure pulsation is reduced.

The driving force of the driving unit 30 is transmitted to the compression unit 20 through the rotation shaft 50. The rotating shaft 50 is fastened to the hollow part 41 formed at the center of the frame 40 so as to be rotatable, and the rotating shaft 50 below the frame 40 is rotated to rotate together with the rotor 32. It is press-fitted in the center of 32, the upper end of the rotary shaft 50 is provided with an eccentric shaft portion 51 eccentric to eccentric rotation.

In addition, a connecting rod 25 is connected between the eccentric shaft portion 51 and the piston 22 to convert the rotational movement of the rotary shaft 50 into a linear reciprocating movement of the piston 22.

In this configuration, when the rotating shaft 50 rotates together with the rotor 32 by the electromagnetic interaction between the stator 31 and the rotor 32, through the eccentric shaft portion 51 and the connecting rod 25. The connected piston 22 is a linear reciprocating motion in the compression chamber 21a, through which the refrigerant guided into the sealed container 10 along the suction pipe 11 is the refrigerant suction chamber 23b of the cylinder head 23. The refrigerant is sucked into the compression chamber (21a) and compressed, and the refrigerant compressed in the compression chamber (21a) is outside the sealed container (10) via the refrigerant discharge chamber (23a) and the discharge tube (12) of the cylinder head (23). It is discharged to, the compression process of the refrigerant through the compressor is carried out as this process is repeated repeatedly.

On the other hand, during the compression action of the refrigerant, the rotating shaft 50 is unbalanced due to the eccentric rotational movement of the eccentric shaft portion 51 and the linear reciprocating movement of the piston 22 formed in a direction perpendicular to the rotation shaft 50. Rotating in a state that will cause vibration or noise.

Therefore, in order to compensate for the rotational imbalance of the rotation shaft 50, the weight balance portion 52 extending in the direction opposite to the eccentric shaft portion 51 is provided on the rotation shaft 50 between the eccentric shaft portion 51 and the frame 40. At the upper and lower portions of the rotor 32, weight balance devices 61 and 62 are installed in directions facing each other.

In the present embodiment, the weight balance devices 61 and 62 effectively compensate for the rotational imbalance of the rotation shaft 50 according to the compression action of the refrigerant regardless of the speed change of the rotation shaft 50, as shown in FIG. It is provided in a variable type so that the weight balance device (61, 62) is a mass body 70 provided to flow in a radial direction from the axial center direction of the rotation shaft 50 by the centrifugal force as the rotation speed of the rotation shaft increases, It comprises an elastic member 81 provided to elastically support the mass 70 in the axial direction of the rotation shaft 50.

That is, when the speed of the rotation shaft 50 is changed, such as when the reciprocating compressor is initially started or when the capacity of the compressor is adjusted, the centrifugal force of the eccentric shaft portion 51 or the linear reciprocating force of the piston 22 are also changed. 50, the degree of rotational imbalance is variable, when the variable weight balance device (61, 62) is employed, the centrifugal force of the mass 70 is variable in response to the degree of rotational imbalance of the rotation shaft 50 due to the change in rotational speed While being able to effectively offset the rotational imbalance of the rotating shaft 50 in accordance with the variable rotation speed.

Referring to the structure of the weight balance device (61, 62) in more detail as follows.

For reference, the weight balance device 61 provided on the upper portion of the rotor 32 and the weight balance device 62 provided on the lower portion may be slightly different only in the thickness or mass of the mass 70 to form the same structure. Since the description of the weight balance device 62 provided below the rotor 32 is omitted, only the weight balance device 61 provided above the rotor 32 will be described in detail.

First, the weight balance device 61 further includes a receiving member 80 for receiving the mass 70 and forming the overall appearance of the weight balance device 61. The receiving member 80 includes the elastic member 81. ) Is provided integrally.

The receiving member 80 is formed to correspond to the shape of the mass 70 provided to have a substantially semi-circular shape, and is provided with an upper plate 82 and a lower plate 83 and a mass to cover the upper and lower surfaces of the mass 70, respectively. And a pair of side support portions 84 and 85 provided to support both ends of the 70, and the space between the upper plate portion 82, the lower plate portion 83, and the side support portions 84 and 85 is the mass body 70. ) To accommodate the receiving space (80a). Here, the elastic member 81 is integrally provided at one end of the side support portion 85 so as to support an end portion of the radially mass body 70 of the rotation shaft 50.

Through the structure of the receiving member 80, the mass 70 is accommodated in the receiving space (80a) in a state capable of flowing in the radial direction of the rotation axis 50, the lower plate portion 83 in the receiving member 80 A fastening hole for fastening the fastening member 100 is formed as a mounting portion 86 for mounting the rotor 32.

In addition, the weight balance device 61 guides the flow direction of the mass 70 in the radial direction of the rotation shaft 50 and at the same time, the separation for preventing the mass 70 from being separated from the receiving member 80. Prevention units 71 and 87 are provided.

In the present embodiment, the separation preventing units 71 and 87 are formed along a radial direction of the pair of guide protrusions 71 provided on the mass body 70 and the rotation shaft 50, and thus the guide protrusions ( 71 is inserted into the upper plate portion 82 is configured to include a guide portion 83 provided as a long hole.

Therefore, when the speed of the rotation shaft 50 is variable, the mass 70 is stably along the radial direction of the rotation shaft 50 while the guide protrusion 71 inserted into the guide portion 87 is guided to the guide portion 87. Of course, the guide protrusion 71 can be prevented from being separated from the receiving member 80 while being caught by both ends of the guide part 87 in the longitudinal direction.

Of course, the configuration of the guide protrusion 71 and the guide portion 87 may be such that the guide guide 71 is formed on the receiving member 80 and the guide portion 87 is formed on the mass 70, The guide portion 87 may also be provided in the form of a long groove.

On the other hand, the receiving member 80 is provided integrally with the elastic member 81, as shown in Figure 3, is made of a plate-shaped press 90 forming a unitary through the initial press working, such a press ( 90 is formed on the rotor 32 while forming the receiving member 80 through bending.

That is, the press 90 is in the form of an annular disk, and the side support portion forming portions 94 and 95 for forming the side support portions 84 and 85 are formed at both sides of the central portion of the press object 90. The upper plate portion forming portion 92 and the lower plate portion forming portion 93 for forming the upper plate portion 82 and the lower plate portion 83 are provided on both sides of the side support portion forming portions 94 and 95, respectively. The unit 95 is provided with a linear plate-shaped elastic support member forming unit 91. The side support forming portions 94 and 95, the upper and lower plate forming portions 92 and 93, and the elastic supporting member forming portion 91 are formed at the same time through a single press process, wherein the guide portion 87 and the mounting portion are formed at the same time. At the same time, the upper plate forming portion 92 and the lower plate forming portion 93 are processed.

Therefore, in order to form the receiving member 80 with such a press 90, as shown in FIGS. 4 and 5, first, the side support part forming parts 94 and 95 are formed so that the receiving space 80a is formed. The upper plate portion forming portion 92 and the lower plate portion forming portion 93 on both sides is bent inwardly, and the mass 70 is disposed between the upper plate portion forming portion 92 and the lower plate forming portion 93 during the bending. Is inserted into the receiving space (80a), wherein the lower plate portion forming portion 93 is fastened to the rotor 32 to the fastening member 100 to the mounting portion 86 before forming the receiving space (80a) It is fixed. In this state, when the elastic support member forming portion 91 is bent to support the mass body 70, as shown in FIG. The elastic member 81 is preferably bent to be refracted a plurality of times so as to double the elastic force.

6 and 7 illustrate the operation of the weight balance device 61 as the speed of the rotating shaft 50 is varied.

First, in the initial start-up of the reciprocating compressor or when the speed of the rotating shaft 50 is rotated to a certain low speed, as shown in FIG. 6, the mass body 70 has both ends almost in contact with the side plates 84 and 85. It maintains the state located inside the accommodation space (80a) and generates a small value centrifugal force.

In this state, as the rotation speed of the rotation shaft 50 gradually increases, the mass body 70 moves the elastic member 81 while the guide protrusion 71 is guided to the guide portion 87 as shown in FIG. 7. It pushes outwards and flows radially to generate a greater centrifugal force, thereby effectively canceling the rotational imbalance of the rotation shaft 50 according to the increase in the rotation speed of the rotation shaft 50.

In this state, when the rotation speed of the rotation shaft 50 decreases again, the mass body 70 flows toward the axial center direction of the rotation shaft 50 again through the restoring force of the elastic member 81 and the rotation speed of the rotation shaft 50. In order to compensate for the rotational imbalance of the rotation shaft (50).

For reference, in the present embodiment, only the weight balance devices 61 and 62 mounted on the rotor 32 are provided in a variable type. However, unlike the present embodiment, the weight balance unit 52 provided on the rotation shaft 50 is also such a type. It may have a configuration corresponding to the configuration of the weight balance device (61, 62) can be provided in a variable type.

As described above in detail, the reciprocating compressor according to the present invention is provided with a weight balance device provided to compensate for the rotational imbalance of the rotary shaft to flow radially from the axial center of the rotary shaft by the centrifugal force as the rotational speed of the rotary shaft increases. It comprises a mass body and an elastic member provided to elastically support the mass body in the axial direction of the rotation axis.

Therefore, the weight balance device according to the present invention can effectively offset the rotational imbalance of the rotational shaft according to the rotational speed varying the centrifugal force of the mass in response to the degree of rotational imbalance of the rotational axis due to the change in the rotational speed.

Claims (10)

A rotating shaft provided with a stator, a rotor provided to rotate in electrical interaction with the stator, an eccentric shaft portion pressed into the center of the rotor to rotate together with the rotor and eccentrically rotating at one end thereof, and the eccentric shaft portion; In the reciprocating compressor having a piston connected via a connecting rod to reciprocate linearly during the rotation of the rotary shaft and compresses the refrigerant, and a weight balance device provided to compensate for the rotational imbalance of the rotary shaft,  The weight balance device includes a mass body provided to flow radially from the axial center direction of the rotation shaft by centrifugal force as the rotation speed of the rotation shaft increases, and an elastic member provided to elastically support the mass body in the axial center direction of the rotation shaft. , And a receiving member accommodating the mass body and having the elastic member integrally. delete The method according to claim 1, The receiving member is formed to be formed so as to form a receiving space for accommodating the mass in the state of being processed into a plate-shaped press and the elastic member is bent so as to come in a position that can elastically support the mass in the axial direction of the rotation axis. Reciprocating compressor. The method according to claim 1, And a departure preventing unit for guiding the flow direction of the mass in the radial direction and preventing the mass from being separated. 5. The method of claim 4, The detachment preventing unit includes a guide protrusion provided on any one of the mass body and the receiving member, and a guide portion provided along the radial direction of the rotation shaft to insert the guide protrusion and provided on the other of the mass body and the receiving member. Reciprocating compressor, characterized in that. 6. The method of claim 5, Reciprocating compressor, characterized in that the guide portion is a groove. 6. The method of claim 5, Reciprocating compressor, characterized in that the guide portion is a hole. 6. The method of claim 5, The guide protrusion is formed in the mass body, the guide portion is a reciprocating compressor, characterized in that the long hole provided in the receiving member. The method according to claim 1, Reciprocating compressor, characterized in that the receiving member is provided with a mounting portion for mounting the receiving member. The method according to claim 1, The weight balance device is a reciprocating compressor, characterized in that provided on at least one of the rotation axis between the eccentric shaft portion and the rotor, and both ends of the rotor.

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