JP2010275913A - Rotary compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary compressor, reducing the energy loss caused by contact of lubricating oil to a rotor and stably operating, without causing oil to rise and poor circulation of lubricating oil agitated by the rotor. <P>SOLUTION: The rotary compressor includes a compression mechanism portion 2 for compressing refrigerant and discharging the same to an outside of the hermetic vessel at an upper portion and an oil reservoir 4 for storing the lubricating oil 3 for lubricating sliding portions of the compression mechanism portion, at a lower portion in a hermetic vessel 1; a main shaft 5, including an oil supply hole 6 inside, connected to the compression mechanism portion 2 at an upper end and dipped in the oil reservoir at a lower end; and a motor for driving the compression mechanism portion through the main shaft. An isolated area 12, surrounded by a bulkhead 11, a lower-end portion of the rotor, and a lower end portion of the stator, is formed by providing the bulkhead fixed on the stator 10 of the motor and covering the lower-end portion of the rotor 9. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rotary compressor that includes a compression mechanism portion, an oil sump for lubricating oil, and an electric motor therein, and the compression mechanism portion is rotationally driven by the electric motor.

  As a conventional rotary compressor, a compression mechanism unit that is housed in a sealed container, compresses the refrigerant introduced into the sealed container, and discharges the refrigerant outside the sealed container, and a lubricating oil that lubricates sliding of the compression mechanism unit. It comprises a stored oil reservoir, a crankshaft having an oil supply passage, one end connected to the compression mechanism and the other end immersed in the oil reservoir, and an electric motor that drives the compression mechanism via the crankshaft. There was a thing (refer patent document 1).

JP 2008-215220 A (FIG. 1)

  Since the conventional rotary compressor is configured as described above, when a large amount of lubricating oil is present in the oil reservoir inside the sealed container, the lower end surface of the rotor of the motor is stored in the oil reservoir. There is a problem in that a large energy loss occurs due to contact friction resistance with the lubricating oil generated when the motor is driven and immersed in the lubricating oil.

  In addition, since the rotor stirs the lubricating oil with a large kinetic energy, so-called oil rising occurs in which the scattered lubricating oil is discharged together with the refrigerant, and in the sealed container due to the backflow of the lubricating oil that has obtained the kinetic energy. There was also a problem that the operation of the rotary compressor became unstable because the circulation of the lubricating oil was hindered.

  The present invention has been made in order to solve the above-described problems, and reduces the loss of energy generated when the lubricating oil comes into contact with the rotor. Another object of the present invention is to provide a rotary compressor that can operate stably without causing circulatory failure.

  A rotary compressor according to the present invention is housed in an upper part of a sealed container, and is provided at a lower part of the sealed container, a compression mechanism that compresses the refrigerant introduced into the sealed container and discharges the refrigerant outside the sealed container. An oil sump in which lubricating oil for lubricating the sliding portion of the compression mechanism portion is stored; a main shaft having an oil supply hole therein, the upper end connected to the compression mechanism portion, and the lower end immersed in the lubricating oil; The rotor rotates integrally with the main shaft and the stator includes an electric motor disposed on the outer peripheral side of the rotor, and the lower end of the rotor is immersed in lubricating oil, and the main shaft is inserted The partition provided with possible openings is fixed to the stator, and the partition is configured to cover the lower end of the rotor so that the partition is surrounded by the lower end of the rotor and the lower end of the stator. The isolated area is formed, and the lubricating oil in the isolated area is stored in the oil reservoir. It is obtained by isolation from other lubricating oil stored in.

  According to the rotary compressor according to the present invention, the compression mechanism unit that is housed in the upper part of the sealed container and compresses the refrigerant introduced into the sealed container and discharges it outside the sealed container, and the lower part of the sealed container is provided. In addition, an oil sump in which lubricating oil for lubricating the sliding portion of the compression mechanism portion is stored and an oil supply hole inside, the upper end is connected to the compression mechanism portion, and the lower end is immersed in the lubricating oil. The main shaft and the rotor rotate integrally with the main shaft, and the stator includes an electric motor disposed on the outer peripheral side of the rotor. The lower end of the rotor is immersed in lubricating oil, and the main shaft Is fixed to the stator, and the partition wall is configured to cover the lower end portion of the rotor, so that the partition wall, the lower end portion of the rotor, and the lower end portion of the stator Lubricating oil in the isolated area, forming an enclosed isolated area Since it is isolated from other lubricants stored in the sump, only a part of the lubricant present in the isolation region is agitated by the rotation of the rotor, reducing the resistance that the rotor receives from the lubricant. Thus, energy loss can be reduced. Further, the agitated lubricating oil is prevented from splashing and oil rising is prevented, and the entire lubricating oil stored in the oil sump obtains kinetic energy by the rotation of the rotor, and the side wall in the sealed container is obtained by centrifugal force. It is unevenly distributed to the side, and it is possible to prevent the notch from flowing backward.

It is sectional drawing which shows the rotary compressor by Embodiment 1 of this invention. It is a perspective view which shows the partition by Embodiment 1 of this invention. It is sectional drawing which shows the rotary compressor by Embodiment 2 of this invention. It is a perspective view which shows the partition by Embodiment 2 of this invention. It is an expanded sectional view which shows the lower part of the rotary compressor by Embodiment 2 of this invention. It is sectional drawing which shows the rotary compressor by Embodiment 3 of this invention. It is a perspective view which shows the partition by Embodiment 3 of this invention.

Embodiment 1 FIG.
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 is a sectional view showing a rotary compressor according to Embodiment 1 of the present invention, and FIG. 2 is a perspective view showing a partition wall. In the figure, an oil sump 4 in which lubricating oil 3 is stored is provided at the bottom of a cylindrical sealed container 1 whose top and bottom are closed. The compression mechanism (rotary pump type) 2 is fixed to the sealed container 1 and connected to the electric motor 7 via the main shaft 5.

  The upper end of the main shaft 5 is attached to the compression mechanism portion 2, and the rotor 9 of the electric motor 7 is fixed at the intermediate portion, and the main shaft 5 is rotatable via a bearing 17 with respect to the lower frame 16 below the electric motor 7. An oil pump 8 is attached to the lower end of the main shaft 5 and is immersed in the lubricating oil 3 stored in the oil sump 4. An oil supply hole 6 is provided in the main shaft 5 in the vertical direction, and the oil supply hole 6 is connected from the oil pump 8 to the compression mechanism section 2.

  The electric motor 7 includes a rotor 9 on the inner peripheral side and a stator 10 on the outer peripheral side. The outer peripheral surface of the stator 10 is fixed to the hermetic container 1, and the outer periphery of the stator 10 is a notch for returning the lubricating oil 3 flowing out from the compression mechanism 2 and the refrigerant suction pipe 13 to the oil sump 4. 15 is provided. The rotor 9 is rotatably arranged on the inner peripheral surface side of the stator 10 through a predetermined gap, and is rotated integrally with the main shaft 5 by being fixed to the main shaft 5.

  The lower frame 16 is fixed to the sealed container 1 at the upper part of the oil sump 4. A cylindrical bearing 17 is provided at the center, and the main shaft 5 is rotatably held via the bearing 17. The lower frame 16 is provided with a lower frame hole 18 for returning the lubricating oil 3 flowing out from the compression mechanism 2 and the refrigerant suction pipe 13 to the oil sump 4. The partition wall 11 is fixed to the lower portion of the stator 10 so as to cover the lower end portion of the rotor 9, and a partition wall opening portion 11a is provided at the center so that the main shaft 5 does not come into contact with the opening portion 11a of the partition wall. Has been inserted.

  Next, the operation of the rotary compressor according to this embodiment configured as described above will be described. When electric power is supplied to the electric motor 7 and the main shaft 5 is driven to rotate, the compression mechanism 2 connected to the main shaft 5 compresses the refrigerant gas introduced into the sealed container 1 from the refrigerant suction pipe 13 and is compressed. The refrigerant gas is discharged out of the sealed container 1 from the refrigerant discharge pipe 14. Further, the oil pump 8 is driven by the rotation of the main shaft 5, and the lubricating oil 3 stored in the oil sump 4 is sent to the compression mechanism portion 2 through the oil supply hole 6 provided in the main shaft 5.

  The lubricating oil 3 lubricates the sliding portion in the compression mechanism portion 2 and flows from the compression mechanism portion 2 into the sealed container 1. The lubricating oil 3 is mixed in the refrigerant discharge pipe 14, but the lubricating oil 3 discharged to the outside of the sealed container 1 returns to the sealed container 1 through the refrigerant suction pipe 13 together with the refrigerant. The lubricating oil 3 that has flowed out of the compression mechanism 2 and the lubricating oil 3 that has flowed into the sealed container 1 via the refrigerant suction pipe 13 pass through the notch 15 provided on the outer periphery of the stator 10 to the oil sump 4. Returned.

  The lower end of the rotor 9 is immersed in the lubricating oil 3 when the lubricating oil 3 is present in a large amount in the oil sump 4. When the rotor 9 rotates in this state, friction is generated between the lower end surface of the rotor 9 and the lubricating oil 3, and resistance torque with respect to the rotational movement of the rotor 9 is generated. Further, the entire lubricating oil 3 stored in the oil sump 4 is agitated by the propagation of frictional force between the lubricating oils.

  In the present invention, the partition wall 11 is provided, and the partition wall 11 forms an isolation region 12 surrounded by the partition wall 11 and the lower end of the rotor 9 and the inner wall and lower end of the stator 10. The lubricating oil 3 is isolated from the lubricating oil 3 present in other portions. The flow path of the lubricating oil 3 that enters the isolation region 12 during operation of the rotary compressor is limited to a small gap between the opening 11 a provided at the center of the partition wall 11 and the main shaft 5. Further, the lubricating oil 3 accelerated by the rotor 9 passes through the gap between the stator 10 and the outer peripheral edge of the partition wall 11 as shown by an arrow A in FIG. It is discharged outside.

  By providing the partition wall 11 in this way, only a part of the lubricating oil 3 existing in the isolation region 12 is agitated by the rotation of the rotor 9, and the resistance that the rotor 9 receives from the lubricating oil 3 is reduced. Thus, energy loss can be reduced. That is, since the electric motor 7 can be driven with small electric power, energy saving can be achieved. Further, the agitated lubricating oil is prevented from splashing and oil rising is prevented, and the entire lubricating oil 3 stored in the oil sump 4 obtains kinetic energy by the rotation of the rotor 9 and is sealed by centrifugal force. 1 is unevenly distributed on the side wall side in 1 and can prevent the notch 15 from flowing backward.

  By attaching the partition wall 11, the lubricating oil 3 stirred by rotating the rotor 9 of the electric motor is mainly the lubricating oil 3 existing above the partition wall 11. The lubricating oil 3 existing below the partition wall 11 is hardly stirred. For this reason, the loss of energy can be reduced compared with the case where there is no partition wall 11 and the entire lubricating oil 3 is stirred. Since the amount of the lubricating oil 3 to be stirred is reduced, it becomes possible to prevent the lubricating oil 3 from rising due to stirring and the scattering of the lubricating oil 3 to the upper part of the sealed container 1.

Embodiment 2. FIG.
3 is a sectional view showing a rotary compressor according to Embodiment 2 of the present invention, and FIG. 4 is a perspective view showing a partition wall. In the figure, a hollow cylindrical portion 21 b is provided upward (in the direction of the compression mechanism portion 2) at the periphery of the opening portion 21 a through which the main shaft 5 is provided at the center portion of the partition wall 21. The flow path of the lubricating oil 3 that enters the isolation region 12 during operation of the rotary compressor is limited to the gap between the opening 21 a provided in the center of the partition wall 21 and the main shaft 5. Further, as in the case of the first embodiment, the lubricating oil 3 accelerated by the rotor 9 passes through the gap between the stator 10 and the outer peripheral edge of the partition wall 21 and is sufficiently outside the isolation region 12 with its kinetic energy reduced sufficiently. Discharged.

  FIG. 5 is an enlarged cross-sectional view showing a lower part of a rotary compressor according to Embodiment 2 of the present invention, and FIG. 5 shows a state in which a sufficient time has elapsed since the start of rotation. When a sufficient time has elapsed from the start, the lubricating oil 3 in the oil sump 4 is subjected to centrifugal force by the rotation of the main shaft 5 itself and is pushed to the side wall side of the hermetic container 1, and the hermetic container from the oil level at the center portion The oil level on the side wall side of 1 is increased. Furthermore, since the lubricating oil 3 in the isolation region 12 is discharged outside the isolation region 12 with sufficiently reduced kinetic energy as described above, the lubricating oil 3 hardly exists in the isolation region 12.

  In such a state, according to the present embodiment, by providing the upward hollow cylindrical portion 21b in the opening portion 21a provided in the central portion of the partition wall 21, vibration or the like when a sufficient time has elapsed from the start of rotation, etc. The oil level of the central portion rises due to external factors of the rotor and the change in the rotational speed of the rotor 9, and is surrounded by the lower end surface of the rotor 9, the inner peripheral side wall and the lower end surface of the stator 10, and the partition wall 21 Even if the lubricating oil 3 enters the isolated region 12, the height of the oil level of the lubricating oil 3 in the oil sump 4 is required to be H1, and the lubricating oil 3 is difficult to enter. That is, in the case of the first embodiment, when the amount of the lubricating oil 3 in the oil sump 4 is larger than H0, the lubricating oil 3 enters the inside of the partition wall and enters. The oil is exposed to the risk of being splashed by the rotor 9 due to external factors such as vibration, impact, and tilt. On the other hand, in the present embodiment, the lubricating oil 3 does not enter the partition wall 21 until the oil level height becomes H1 (> H0). For example, the oil level height is H (H0 <H <H1). ), The lubricating oil 3 does not enter the partition wall 21. Further, since the inflow path has a narrow duct structure, the effect of making it difficult for the lubricating oil 3 to enter the isolation region 12 is obtained.

  As a result, the amount of the lubricating oil 3 existing in the isolation region 12 at the time of rotational driving is reduced, the resistance that the rotor 9 receives from the lubricating oil 3 can be further reduced, and the energy loss can be further reduced. Further, by limiting the lubricating oil 3 affected by the rotor 9 to the lubricating oil 3 in the isolation region 12, it is possible to reduce energy loss generated when the rotor 9 agitates the lubricating oil 3. . Further, the lubricating oil 3 in the oil sump 4 is prevented from being scattered by stirring, and rotational kinetic energy around the rotating shaft of the rotor 9 is obtained, and the lubricating oil 3 is applied to the side wall side in the sealed container 1 by centrifugal force. It is unevenly distributed and can prevent the notch 15 from flowing backward.

Embodiment 3 FIG.
6 is a sectional view showing a rotary compressor according to Embodiment 3 of the present invention, and FIG. 7 is a perspective view showing a partition wall. In the figure, the opening 31a for passing the main shaft 5 provided in the central part of the partition wall 31 is composed of a circular part having a diameter larger than that of the rotor 9, so that the rotor 9 can pass through. The height of the partition wall 31 in the vertical direction (H2 in FIG. 6) is such that the partition wall 31 is positioned in the vicinity of the lower frame 16 when the partition wall 31 is attached to the stator 10. 9, the inner wall and lower end of the stator 10, and the lower frame 16 form an isolation region 12. A bottom plate portion 31b is formed at the bottom of the partition wall 31 except for the opening 31a.

  During operation of the rotary compressor, the flow path of the lubricating oil 3 flowing into the isolation region 12 is limited to a small gap between the bottom plate portion 31b of the partition wall 31 and the lower frame 16, and the lubricating oil 3 accelerated by the rotor 9 is In a state where the kinetic energy is sufficiently reduced by friction with the inner wall of the partition wall 31, it is discharged to the outside of the isolation region 12 through the gap between the bottom plate portion 31 b and the lower frame 16. The lower frame hole 18 is formed in a plurality of lower frames 16 in the shape of an elongated shape. Actually, the lubricating oil 3 flowing from the lower frame hole 18 through the opening 31a and flowing into the isolation region 12 is Almost does not exist.

  According to the present embodiment, the opening 31a provided in the central portion of the partition wall 31 is configured to be larger than the diameter of the rotor 9 in a cross section perpendicular to the central axis of the rotor 9, so that the stator The rotor 9 can be inserted in a state where the partition wall 31 is fixed to 10. In the first and second embodiments, it is necessary to first insert the rotor 9 into the stator 10 and then fix the partition wall. In this case, the positional relationship between the stator 10 and the rotor 9 is highly accurate. Therefore, if the partition is fixed after the rotor 9 is assembled to the stator 10, the adjustment may go wrong. On the other hand, in this embodiment, since the rotor 9 is inserted in a state where the partition wall 31 is fixed to the stator 10, the position adjustment does not go wrong and the assemblability is improved.

  Further, by extending the vertical height of the partition wall 31 to the vicinity of the lower frame 16, the lower end surface of the rotor 9, the inner peripheral side wall and the lower end surface of the stator 10, and the isolation region 12 surrounded by the partition wall 31 are formed. . By limiting the lubricating oil 3 affected by the rotor 9 to the lubricating oil 3 in the isolation region 12, energy loss generated when the rotor 9 agitates the lubricating oil 3 can be reduced. Further, the lubricating oil 3 in the oil sump 4 is prevented from being scattered by stirring, and rotational kinetic energy around the rotating shaft of the rotor 9 is obtained, and the lubricating oil 3 is applied to the side wall side in the sealed container 1 by centrifugal force. It is unevenly distributed and can prevent the notch 15 from flowing backward.

1 sealed container, 2 compression mechanism, 3 lubricating oil, 4 oil sump, 5 spindle, 6 oil supply hole,
7 electric motor, 9 rotor, 10 stator, 11, 21, 31 partition, 11a opening,
12 isolation area, 16 lower frame.

Claims (4)

A compression mechanism that is housed in the upper part of the sealed container and compresses the refrigerant introduced into the sealed container and discharges the refrigerant out of the sealed container; and a sliding part of the compression mechanism that is provided at the lower part of the sealed container An oil reservoir in which lubricating oil for lubrication is stored, a main shaft having an oil supply hole therein, an upper end connected to the compression mechanism portion and a lower end immersed in the lubricating oil, and a rotor including the main shaft And the stator includes an electric motor disposed on the outer peripheral side of the rotor, and the lower end of the rotor is immersed in the lubricating oil. A partition wall provided with a possible opening is fixed to the stator, and the partition wall is configured to cover a lower end portion of the rotor, whereby the partition wall, the lower end portion of the rotor, and the stator Isolation surrounded by bottom edge To form a band, rotary compressor, characterized in that isolated from other types of lubricating oil stored in the reservoir the oil the lubricating oil of said isolation region. The rotary compressor according to claim 1, wherein the main shaft is inserted through a small gap in the opening. The rotary compressor according to claim 2, wherein a hollow cylindrical portion is provided upward at a peripheral edge of the opening. The opening is composed of a circular portion having a larger diameter than the rotor, and a lower frame for rotatably holding the main shaft is provided below the partition, and the lower end of the partition and the rotor The rotary compressor according to claim 1, wherein the isolation region is formed by a portion, a lower end portion of the stator, and the lower frame.

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