JP2007085222A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor in which the favorable rotational balance of a rotating shaft is secured at low cost. <P>SOLUTION: In this compressor (rotary compressor 10), a motor-driven element 14 as a driving element and a compression element driven by the rotating shaft 16 of the motor-driven element 14 are stored in a hermetic container 12. A flywheel 70 is formed integrally with the rotating shaft 16. The compression element is a rotating compression mechanism 18 formed of first and second rotary compression elements 32, 34 having rollers 46, 48 eccentrically rotating in upper and lower cylinders 38, 40. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a compressor in which a driving element and a compression element driven by a rotating shaft of the driving element are housed in a sealed container.

  Conventionally, in this type of compressor, for example, a hermetic rotary compressor, a motor as a driving element and a rotary compression element driven by a rotating shaft of the motor are housed in a hermetic container. The rotary compression element includes a roller fitted to an eccentric portion formed on one end side of the rotary shaft, a cylinder that houses the roller, and a cylinder that is in contact with the circumferential surface of the roller to be divided into a suction side and a discharge side. A vane or the like is provided, and a motor applies a rotational force to the roller via a rotating shaft.

  The motor is composed of a stator that is welded and fixed in an annular shape along the inner peripheral surface of the upper space of the sealed container, and a rotor that is inserted and installed at a slight interval inside the stator. The rotor is fixed to the rotating shaft extending in the vertical direction through the center. A bearing that rotatably supports the rotating shaft is formed on the motor side of the rotary compression element.

  By the way, in such a compressor, the problem that rotation of a rotating shaft becomes unbalanced has arisen. In particular, in the rotary compressor, the rotor of the drive element is provided on one end side of the rotary shaft, and the eccentric portion of the rotary compression element is provided on the other end side, so that the rotor has the largest rotational torque generated from the stator. Due to the provision at the center position of the child, the rotational balance of the rotating shaft is difficult to achieve, and there has been a problem of occurrence of conical pendulum-like blurring and vibration.

Therefore, in order to eliminate such inconvenience, a fly hole having a predetermined weight is attached to the end surface on the rotary compression element side of the motor to increase the moment of inertia of the rotor, and the rotational unbalance accompanying the rotation of the rotary shaft is reduced. It was suppressed. By providing the fly hole and setting the center of gravity of the rotating shaft in the vicinity of the bearing, the amplitude width of the rotating shaft is suppressed, and favorable rotation can be secured (for example, see Patent Document 1).
JP 2002-130171 A

  However, since the fly hole is formed by cutting the whole, the processing cost is high, and it is necessary to attach it to the end face of the motor, which increases the number of mounting steps and significantly increases the manufacturing cost. Has occurred. Further, when the fly hole is attached to the end face of the motor, the fly hole is located away from the bearing, so that it is difficult to make the center of gravity of the rotating shaft coincide with the bearing.

  The present invention has been made to solve the problems of the related art, and an object of the present invention is to provide a compressor that can secure a good rotational balance of a rotating shaft at low cost.

  The compressor according to the present invention comprises a driving element and a compression element driven by a rotating shaft of the driving element in an airtight container, and a fly hole is integrally formed on the rotating shaft. It is what.

  In the compressor according to the second aspect of the present invention, in the above invention, the compression element is a rotary compression element provided with a roller that rotates eccentrically in the cylinder.

  According to a third aspect of the present invention, there is provided a compressor in which a flyhole is formed at a position in the vicinity of the bearing of the rotary shaft in each of the above inventions.

  According to a fourth aspect of the present invention, there is provided a compressor according to the above-mentioned invention, wherein a hole penetrating the flywheel in the axial direction of the rotary shaft is formed.

  According to the compressor of the present invention, since the fly hole is formed integrally with the rotating shaft, vibration of the rotating shaft can be easily suppressed.

  Also, for example, the flyhole can be easily machined by forming the flyhole integrally with the rotary shaft and finishing it by cutting. As a result, the manufacturing cost can be reduced.

  Furthermore, when the compression element is a rotary compression element having a roller that rotates eccentrically in the cylinder as in claim 2, vibration of the eccentric rotation roller and vibration of the drive element are suppressed by the inertial effect of the flyhole. Can do.

  Further, by forming the flyhole at a position near the bearing of the rotating shaft as in the invention of claim 3, the center of gravity of the rotating shaft can be matched with the bearing, and the rotation balance of the rotating shaft can be improved. it can.

  Furthermore, by forming the hole penetrating the flywheel in the axial direction of the rotating shaft as in claim 4, it is possible to avoid the disadvantage that the flow of refrigerant or oil is hindered by the flyhole.

  Hereinafter, embodiments of the compressor of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a longitudinal side view of a multistage compression rotary compressor 10 having first and second rotary compression elements 32 and 34 as an embodiment of the compressor of the present invention. In FIG. 1, a rotary compressor 10 of the present embodiment is an internal intermediate type rotary compressor, and as a drive element disposed in an upper side of the internal space of the sealed container 12 in a vertical cylindrical sealed container 12 made of a steel plate. Of the electric element 14 and rollers 46 and 48 which are disposed below the electric element 14 and are driven by the rotating shaft 16 of the electric element 14 and rotate eccentrically in upper and lower cylinders 38 and 40 which will be described later. The rotary compression mechanism part 18 which consists of the 1st and 2nd rotary compression elements 32 and 34 is accommodated. Note that carbon dioxide is used as a refrigerant in the rotary compressor 10 of the embodiment.

  The sealed container 12 has an oil reservoir at the bottom, a container body 12A that houses the electric element 14 and the rotary compression mechanism 18, and a generally bowl-shaped end cap (lid body) 12B that closes the upper opening of the container body 12A. A circular mounting hole 12D is formed on the upper surface of the end cap 12B, and a terminal (wiring is omitted) 20 for supplying power to the electric element 14 is mounted in the mounting hole 12D. ing.

  The electric element 14 includes a stator (stator) 22 welded and fixed in an annular shape along the inner peripheral surface of the upper space of the sealed container 12, and a rotor (inserted and installed inside the stator 22 with a slight gap). The rotor 24 is fixed to a rotary shaft 16 that passes through the center and extends in the vertical direction.

  The stator 22 has a laminated body 26 in which donut-shaped electromagnetic steel plates are laminated, and a stator coil 28 wound around the teeth of the laminated body 26 by a direct winding (concentrated winding) method. Similarly to the stator 22, the rotor 24 is also formed of a laminated body 30 of electromagnetic steel plates.

  The rotary compression mechanism section 18 has the second rotary compression element 34 as the second stage sandwiched between the intermediate partition plate 36 and the first rotary compression element as the first stage on the electric element 14 side in the hermetic container 12. 32 is arranged on the side opposite to the electric element 14. That is, the first rotary compression element 32 and the second rotary compression element 34 are arranged above and below the intermediate partition plate 36, and the above-described upper and lower cylinders 38 constituting the first and second rotary compression elements 32, 34, 40 and rollers 46 and 48 which are fitted to upper and lower eccentric portions 42 and 44 formed on the rotating shaft 16 of the electric element 14 and eccentrically rotate in the cylinders 38 and 40, respectively, and abut against the rollers 46 and 48. Vanes 50 and 52 that divide the cylinders 38 and 40 into a low-pressure chamber side and a high-pressure chamber side, and springs 85 and 86 as spring members for constantly biasing the vanes 50 and 52 toward the rollers 46 and 48, While closing one (lower side) opening of the lower cylinder 40, the lower support member 56 as a support member having the auxiliary bearing 56A of the rotating shaft 16 and the upper opening of the upper cylinder 38 are closed and rotated. Constituted by the upper support member 54 having a main bearing 54A of 16. Therefore, the rotary shaft 16 of this embodiment is supported by the main bearing 54A at the substantially central portion in the axial direction of the rotary shaft 16, and supported by the auxiliary bearing 56A at the lower part. The upper and lower eccentric parts 42 and 44 are provided on the rotary shaft 16 with a phase difference of 180 degrees.

  The upper support member 54 and the lower support member 56 have a suction passage 60 that communicates with the inside of the upper and lower cylinders 38 and 40 through a suction port (not shown), respectively (the suction passage of the second rotary compression element 34 is not shown), The discharge silencer chamber 62 formed by recessing the surface (upper side) opposite to the upper cylinder 38 of the upper support member 54 and closing the recess with the upper cover 63, and the lower cylinder of the lower support member 56 A discharge silencer chamber 64 formed by recessing the surface opposite to (lower side) 40 and closing the recess with a lower cover 68 is provided. That is, the discharge silence chamber 62 is closed by the upper cover 63 and the discharge silence chamber 64 is closed by the lower cover 68.

  The lower cover 68 is composed of a donut-shaped circular steel plate, and is fixed to the lower support member 56 from below with lower bolts 80 at the peripheral portions, and the first rotary compression element 32 is fixed at the discharge port. The lower surface opening of the discharge silencing chamber 64 communicating with the inside of the lower cylinder 40 is closed. The ends of the bolts 80 are screwed into the upper support member 54.

  The discharge silencer chamber 64 of the first rotary compression element 32 and the inside of the sealed container 12 are communicated with each other through a communication path. This communication path is a hole (not shown) that passes through the upper cover 63, the upper support member 54, the upper and lower cylinders 38 and 40, and the intermediate partition plate 36. In this case, an intermediate discharge pipe 121 is erected at the upper end of the communication path, and an intermediate pressure refrigerant is discharged from the intermediate discharge pipe 121 into the sealed container 12.

  Here, the main bearing 54 </ b> A between the electric element 14 provided on the upper end side of the rotary shaft 16 and the rotary compression mechanism 18 provided on the lower end side, which is a position that is substantially the center of the rotary shaft 16 in the axial direction. A fly hole 70 is formed integrally with the rotary shaft 16 at a position near the rotary shaft 16. The flyhole 70 extends in the vertical direction from the rotating shaft 16 and has a substantially disk shape having a uniform thickness in the entire axial direction (height direction). The weight of the flyhole 70 is uniform over the entire area with respect to the rotating shaft 16. Due to the presence of the flyhole 70, the moment of inertia of the rotating shaft 16 can be increased, and the rotation imbalance accompanying the rotation of the rotating shaft 16 can be suppressed.

  In particular, in the rotary compressor 10, the rotor 24 of the electric element 14 is attached to one end side (upper end side) of the rotary shaft 16, and the first and second rotary compression elements 32 and 34 are eccentric to the other end side (lower end side). And the rotor 24 is installed at the center position of the stator 22 where the rotational torque generated from the stator 22 is maximized. Therefore, it is difficult to balance the rotation of the rotating shaft 16, and a circular pendulum shape. There was a problem of shaking and vibration.

  However, since the center of gravity of the rotating shaft 16 can be made near the main bearing 54A by the fly hole 70 of the present invention, the amplitude width of the rotating shaft 16 is suppressed and good rotation can be secured.

  Further, by forming the flyhole 70 integrally with the rotary shaft 16, it is possible to reliably match the center of gravity with the main bearing 54A. Further, since it is not necessary to perform attachment work such as attachment to the end face of the electric element 14 as in the case where the rotary shaft 16 is configured as a separate member, the number of work steps can be reduced.

  And the fly hole 70 of a present Example is integrally formed with the rotating shaft 16 with a casting, and is comprised by cutting this. Thereby, it is possible to manufacture the rotary shaft 16 integrated with the flyhole 70 by performing simple processing without cutting the entire flyhole. Thereby, production cost can be suppressed as much as possible, and generation of vibration of the rotating shaft 16 can be suppressed.

  Further, on the side surface of the container main body 12A of the sealed container 12, the suction passage 60 (upper side is not shown) of the upper support member 54 and the lower support member 56, the discharge silencing chamber 62, the upper side of the upper cover 63 (of the electric element 14). Sleeves 141, 142, 143, and 144 are welded and fixed at positions corresponding to the positions substantially corresponding to the lower ends. The sleeves 141 and 142 are adjacent to each other vertically, and the sleeve 143 is substantially diagonal to the sleeve 141. Further, the sleeve 144 is located at a position shifted by approximately 90 degrees from the sleeve 141.

  One end of a refrigerant introduction pipe 92 for introducing refrigerant gas into the upper cylinder 38 is inserted and connected into the sleeve 141, and one end of the refrigerant introduction pipe 92 communicates with a suction passage (not shown) of the upper cylinder 38. The refrigerant introduction pipe 92 passes through the upper side of the sealed container 12 to reach the sleeve 144, and the other end is inserted and connected into the sleeve 144 to communicate with the sealed container 12.

  One end of a refrigerant introduction pipe 94 for introducing refrigerant gas into the lower cylinder 40 is inserted into and connected to the sleeve 142, and one end of the refrigerant introduction pipe 94 communicates with the suction passage 60 of the lower cylinder 40. Further, a refrigerant discharge pipe 96 is inserted and connected into the sleeve 143, and one end of the refrigerant introduction pipe 96 communicates with the discharge silencer chamber 62.

  Next, the operation of the rotary compressor with the above configuration will be described. When the stator coil 28 of the electric element 14 is energized through the terminal 20 and a wiring (not shown), the electric element 14 is activated and the rotor 24 rotates. By this rotation, the rollers 46 and 48 fitted to the upper and lower eccentric portions 42 and 44 provided integrally with the rotary shaft 16 eccentrically rotate in the upper and lower cylinders 38 and 40. At this time, the rotating shaft 16 has a large moment of inertia due to the presence of the integrally formed flyhole 70. Therefore, due to the inertia effect of the flyhole 70 and the effect that the center of gravity of the rotary shaft 16 can be adjusted to the main bearing 54A by providing the flyhole 70, the vibrations of the eccentric rotating rollers 46 and 48 and the electric drive The amplitude width of the rotor 24 of the element 14 can be suppressed. As a result, it is possible to ensure a good rotational balance of the rotating shaft 16.

  On the other hand, when the rollers 46 and 48 are eccentrically rotated, the low-pressure refrigerant sucked into the lower cylinder 40 from the suction port (not shown) via the suction passage 60 formed in the refrigerant introduction pipe 94 and the lower support member 56. The gas is compressed by the operation of the roller 48 and the vane 52 to become an intermediate pressure, and is discharged from the high pressure chamber side of the lower cylinder 40 into the discharge silencer chamber 64 through a discharge port (not shown). The intermediate-pressure refrigerant gas discharged into the discharge silencer chamber 64 is discharged into the sealed container 12 from the intermediate discharge pipe 121 through a communication hole (not shown).

  The intermediate-pressure refrigerant gas in the sealed container 12 passes through the refrigerant introduction pipe 92 and is sucked from the suction port to the low pressure chamber side of the upper cylinder 38 through a suction passage (not shown) formed in the upper support member 54. Is done. The suctioned intermediate-pressure refrigerant gas is compressed in the second stage by the operation of the roller 46 and the vane 50 to become a high-temperature and high-pressure refrigerant gas, and passes through a discharge port (not shown) from the high-pressure chamber side of the upper cylinder 38. It is discharged into a discharge silencer chamber 62 formed in the upper support member 54. The refrigerant discharged into the discharge silencing chamber 62 is discharged to the outside of the rotary compressor 10 through the refrigerant discharge pipe 96 communicated with the discharge silencing chamber 62.

  As described in detail above, according to the present invention, the high-performance rotary compressor 10 having a good rotation balance of the rotating shaft 16 can be manufactured at low cost.

  In Example 1, as a compressor of the present invention, the refrigerant compressed by the first rotary compression element 32 is discharged into the sealed container 12, and then compressed by the second rotary compression element 34 to the outside. Although the description has been made using the internal intermediate pressure type rotary compressor 10 that discharges, the compressor of the present invention is not limited to this. Therefore, for example, the refrigerant compressed by the first rotary compression element may be directly compressed by the second rotary compression element and applied to an internal high-pressure type compressor that discharges the refrigerant into the sealed container. An embodiment in this case will be described with reference to FIG.

  FIG. 2 is a vertical side view of the internal high-pressure rotary compressor 110 including the first and second rotary compression elements 32 and 34. In FIG. 2, the same reference numerals as those in FIG. 1 denote the same or similar effects, and the description thereof is omitted.

  In FIG. 2, a sleeve 145 is welded and fixed at a position corresponding to the discharge silencing chamber 64 on the side surface of the container body 12 </ b> A of the sealed container 12, and the sleeve 145 is on a substantially diagonal line of the sleeve 142. In the sleeve 145, the other end of the refrigerant introduction pipe 92 for introducing the refrigerant gas into the upper cylinder 38 is inserted and connected to communicate with the discharge silencer chamber 64. A sleeve (not shown) for inserting and connecting the refrigerant discharge pipe 96 is welded and fixed in the vicinity of the mounting hole 12D of the end cap 12B. The refrigerant discharge pipe 96 is inserted and connected into the sleeve, and the inside of the sealed container 12 is connected. Communicate with.

  The upper cover 63 is formed with a communication path (not shown) that communicates the discharge silencer chamber 62 and the inside of the sealed container 12. A discharge pipe 125 is erected at the upper end of the communication path, and high-temperature and high-pressure refrigerant gas compressed by the second rotary compression element 34 is discharged from the discharge pipe 125 into the sealed container 12. The opening of the discharge pipe 125 is directed upward, that is, toward the electric element 14 side.

  In FIG. 2, reference numeral 170 denotes a flyhole of the present embodiment, which is formed integrally with the rotary shaft 16 as in the first embodiment. In addition, the flyhole 170 is also located at a substantially central position in the axial direction of the rotary shaft 16, that is, between the electric element 14 provided on the upper end side of the rotary shaft 16 and the rotary compression mechanism portion 18 provided on the lower end side. It is formed at a position near the main bearing 54A, extends in the vertical direction from the rotary shaft 16, and has a substantially disk shape having a uniform thickness in the entire axial direction. Further, the weight of the flyhole 170 is also made uniform over the entire area with respect to the rotary shaft 16, similarly to the flyhole 70.

  On the other hand, the through-holes 171 and 172 that penetrate the fly hole 170 in the axial direction of the rotary shaft 16 are formed in the fly hole 170 of the present embodiment. The through holes 171 and 172 are compressed by oil and refrigerant gas, particularly the second rotary compression element 34, and the refrigerant gas discharged from the discharge pipe 125 to the sealed container 12 enters the end cap 12 </ b> B above the sealed container 12. It is formed in order to secure the flow of the refrigerant discharged from the formed refrigerant discharge pipe 96 to the outside. That is, when the fly hole is provided without forming the through holes 171, 172, the refrigerant discharged from the discharge pipe 125 to the sealed container 12 flows into the refrigerant discharge pipe 96 above the fly hole. It must pass through a slight gap between the inner wall of the container body 12A and the flyhole. In this case, the movement of the refrigerant gas above the flyhole is stagnant, and the high-temperature and high-pressure refrigerant gas discharged to the hermetic container 12 is not easily discharged smoothly from the refrigerant discharge pipe 96 provided in the end cap 12B. There is a fear.

  Therefore, by forming the through holes 171 and 172, the refrigerant discharged from the discharge pipe 125 passes through the through holes 171 and 172, and easily flows smoothly above the flyhole 170, thereby obstructing the flow of the refrigerant. Can be avoided. The through holes 171 and 172 are formed at target positions with respect to the center of the rotation shaft 16 which is a position balanced with respect to the rotation of the rotation shaft 16 and have substantially the same shape. Therefore, the formation of the through holes 171 and 172 does not cause a problem that the rotation of the rotating shaft 16 is unbalanced.

  Note that the rotary compressor 110 of this embodiment also uses carbon dioxide as a refrigerant.

  Next, the operation of the rotary compressor 110 with the above configuration will be described. When the stator coil 28 of the electric element 14 is energized through the terminal 20 and a wiring (not shown), the electric element 14 is activated and the rotor 24 rotates. By this rotation, the rollers 46 and 48 fitted to the upper and lower eccentric portions 42 and 44 provided integrally with the rotary shaft 16 eccentrically rotate in the upper and lower cylinders 38 and 40. At this time, the rotating shaft 16 has a large moment of inertia due to the presence of the integrally formed flyhole 170. Therefore, due to the inertia (inertia) effect of the flyhole 170 and the effect that the center of gravity of the rotary shaft 16 can be adjusted to the main bearing 54A by providing the flyhole 170, the vibrations of the eccentric rotation rollers 46 and 48 and the electric drive The amplitude width of the rotor 24 of the element 14 can be suppressed. As a result, it is possible to ensure a good rotational balance of the rotating shaft 16.

  On the other hand, when the rollers 46 and 48 are eccentrically rotated, the low-pressure refrigerant sucked into the lower cylinder 40 from the suction port (not shown) via the suction passage 60 formed in the refrigerant introduction pipe 94 and the lower support member 56. The gas is compressed by the operation of the roller 48 and the vane 52 to become an intermediate pressure, and is discharged from the high pressure chamber side of the lower cylinder 40 into the discharge silencer chamber 64 through a discharge port (not shown).

  The intermediate-pressure refrigerant gas discharged into the discharge muffler chamber 64 is sucked through a refrigerant introduction pipe 92 communicated with the discharge muffler chamber 64 via a suction passage (not shown) formed in the upper support member 54. The air is sucked into the low pressure chamber side of the upper cylinder 38 from the port. The intermediate-pressure refrigerant gas sucked into the upper cylinder 38 is compressed at the second stage by the operation of the roller 46 and the vane 52 to become a high-temperature / high-pressure refrigerant gas, and is discharged from the high-pressure chamber side of the upper cylinder 38 (not shown). It passes through the port and is discharged into a discharge silencer chamber 62 formed in the upper support member 54.

  The refrigerant discharged into the discharge silencer chamber 62 is discharged from the discharge pipe 125 into the sealed container 12 via a communication path (not shown). The refrigerant discharged into the hermetic container 12 flows through the through holes 171 and 172 formed in the fly hole 170 or through the gap between the fly hole 170 and the inner wall of the container body 12A to the upper side of the fly hole 170. Further, the electric element 14 passes through the gap of the electric element 14, moves upward in the sealed container 12, and is discharged to the outside of the rotary compressor 110 from the refrigerant discharge pipe 96 connected to the end cap 12 </ b> B.

  As described in detail above, also in this embodiment, the high-performance rotary compressor 110 having a good rotation balance of the rotating shaft 16 can be manufactured at a low cost.

  In each of the embodiments described above, the multistage compression rotary compressor having the first and second rotary compression elements is used as the compressor. However, the present invention is based on the drive element and the rotary shaft of the drive element in the sealed container. Any compressor provided with a compression element is applicable. The present invention is also effective for a single-stage compressor and a compressor having three or more compression elements.

  In each embodiment, carbon dioxide is used as the refrigerant of the compressor. However, other refrigerants may be used.

It is a vertical side view of the compressor of one Example of this invention. It is a vertical side view of the compressor of the other Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 110 Rotary compressor 12 Airtight container 14 Electric element 16 Rotating shaft 18 Rotation compression mechanism part 20 Terminal 22 Stator 24 Rotor 26 Laminated body 28 Stator coil 30 Laminated body 32 1st rotational compression element 34 2nd rotation compression element 38 Top Cylinder 40 Lower cylinder 42, 44 Eccentric part 46, 48 Roller 54 Upper support member 56 Lower support member 54A Main bearing 56A Sub bearing 62, 64 Discharge silencer 70, 170 Fly hole 92, 94 Refrigerant introduction pipe 96 Refrigerant discharge pipe 121 Intermediate Discharge pipe 125 Discharge pipe 171, 172 Through hole

Claims (4)

In a compressor in which a driving element and a compression element driven by a rotating shaft of the driving element are housed in a sealed container,
A compressor characterized in that a flyhole is integrally formed on the rotating shaft.   The compressor according to claim 1, wherein the compression element is a rotary compression element including a roller that rotates eccentrically in a cylinder.   The compressor according to claim 1 or 2, wherein the fly hole is formed at a position near a bearing of the rotating shaft.   The compressor according to any one of claims 1 to 3, wherein a hole penetrating the flywheel in an axial direction of the rotary shaft is formed.

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