JP2009019505A - Vertical type scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve such a problem that a bearing part is damaged when oil circulation quantity increases to make oil in a foamed state remain in a filter, and decrease quantity of oil returning to an oil sump, causing cut in oil surface in the oil sump to stop feeding of oil to the bearing part. <P>SOLUTION: The device is provided with a support plate to part the inner space of a sealed container, an oil sump part provided at a bottom part in the sealed container that is parted by the support plate, and a communication hole formed in the support plate to communicate with the oil sump part. A filter is provided in the communication hole to project upward. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vertical scroll compressor used in a refrigeration air conditioner or the like.

  A conventional vertical scroll compressor is disclosed in, for example, Japanese Patent Application Laid-Open No. 2-11889. As shown in FIG. 4 of Patent Document 1, the sealed container 2 contains a fixed scroll 3, a swing scroll 17, and a motor that drives the swing scroll 17. The driving force of the motor is transmitted to the swing scroll 17 by the main shaft 7. The main shaft 7 is rotatably supported by an upper main bearing 8 and a lower main bearing 9 provided on the upper bearing frame 4 and the lower bearing frame 6.

  Further, as shown in FIG. 3 of Patent Document 1, an oil sump 14 is provided at the lower portion of the sealed container 2, and a partition plate 27 is disposed so as to cover the oil sump 14. The lower end of the main shaft 7 passes through the central portion of the partition plate 27, and an oil cap 13 is provided between the partition plate 27 and the main shaft 7. The lower portion of the oil cap 13 is provided with a suction port 13a. The oil 16 is sucked from the suction port 13a through an oil supply hole 25 formed in the main shaft 7, and the rocking bearing 18, the lower main bearing 9, the upper main bearing 8, and the thrust Oil is supplied to the bearings 23 to lubricate the bearings. The oil which lubricated each bearing falls to the partition plate 27 by gravity. The partition plate 27 is formed with an oil return hole 27 c for returning the dropped oil to the oil sump 14. A filter 28 is provided on the rear surface of the partition plate 27 so as to cover the oil return hole 27c. Foreign matter contained in the oil that has fallen into the partition plate 27 and has flowed into the oil return hole 27c is filtered by the filter 28, It returns to the reservoir 14.

Japanese Patent Laid-Open No. 2-11889

  As described above, when the scroll compressor is operated and the main shaft 7 is rotated, the oil 16 in the oil sump 14 is sucked from the suction port 13a and is passed through the oil supply hole 25 of the main shaft 7 to the swing bearing 18, the lower main bearing 9, and the upper portion. Oil is supplied to the main bearing 8 and the thrust bearing 23 to lubricate each bearing. The oil 16 that has lubricated the bearings falls to the partition plate 27 and foreign matter contained in the oil flowing into the oil return holes 27 c is filtered by the filter 28 and returned to the oil sump 14. During operation of the scroll compressor, the oil 16 circulates in the sealed container 2 as described above.

  In the sealed container, refrigerant gas is present in addition to oil for lubricating the bearing and the like. Since the refrigerant gas and the oil are present in the same sealed container, a part of the refrigerant gas is mixed in the oil. When the compressor is in operation, the refrigerant gas and the oil form a vortex flow in the hermetic container, and the refrigerant gas is encased in a liquid film of oil and is in a foamed state. If oil flows into the oil sump through the oil return hole of the partition plate in the foamed state, oil mixed with air bubbles is supplied to each part of the bearing, so it is difficult to form an oil film and the squeeze effect of the oil film is not demonstrated. There was a problem that the bearing strength was reduced.

  Therefore, it is conceivable to provide a filter 28 for removing foreign matter in the oil return hole 27c of the partition plate 27 as in Patent Document 1 to suppress foaming of oil flowing into the oil sump together with the removal of foreign matter. Since the pore diameter of 27c is small, and the filtration area of the filter 28 arranged here is also small, the oil in the foamed state stagnates in the filter 28 when the amount of circulating oil increases. For this reason, there is a problem that the amount of oil returning to the oil sump 14 is reduced, the oil level of the oil sump 14 is cut, the oil cannot be supplied to the bearing part, and the bearing part is damaged.

  An object of the present invention is to solve the above-described problems, and is a scroll compression that suppresses foaming of oil supplied to the bearing portion and ensures oil supply to the bearing to prevent damage to the bearing portion. Is to provide a machine.

  In order to achieve the above object, a feature of the present invention is that a compression mechanism portion provided in an airtight container and having a fixed scroll and a turning scroll, and a rotor and a stator for driving the compression mechanism portion. A vertical scroll compressor having an electric motor portion having a main shaft provided with an eccentric portion and transmitting a rotation of the electric motor portion to the compression mechanism portion, and a bearing of the main shaft, and an outer peripheral portion thereof fixed to the sealed container A support plate that is attached to the frame, a sub-bearing that supports the shaft portion on the opposite side of the eccentric portion of the main shaft, and that partitions the internal space of the sealed container; and a bottom portion in the sealed container that is partitioned by the support plate. An oil sump portion formed in the support plate and communicating with the oil sump portion, and an oil supply passage formed in the main shaft for supplying lubricating oil in the oil sump portion to the compression mechanism portion. Comprising The hole lies in having a filter that protrudes upward.

  According to the present invention, since the filter projecting upward is provided in the communication hole communicating with the oil reservoir, the filtration area of the filter can be secured, and foaming of oil supplied to the bearing portion is suppressed, It is possible to provide a scroll compressor that ensures oil supply to the bearing and prevents damage to the bearing portion.

  Embodiments of the present invention will be described below with reference to the drawings.

  The configuration of the vertical scroll compressor according to this embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a longitudinal sectional view of a vertical scroll compressor according to an embodiment of the present invention, and FIG. 2 is a plan view of a support plate 18 of the vertical scroll compressor according to an embodiment of the present invention.

  In FIG. 1, 1 is an airtight container which comprises the outline of a scroll compressor. The sealed container 1 is formed in a cylindrical shape, and has a sealed structure with a bottom plate 1a and a top plate 1b attached to both ends of the tube. Reference numeral 2 denotes a compression mechanism section that compresses the refrigerant. The compression mechanism section 2 includes a fixed scroll 3 disposed on the upper side of the sealed container 1 and a turning scroll 4 disposed below the fixed scroll 3. Yes. The end plates of the fixed scroll 3 and the orbiting scroll 4 are respectively formed with spiral wraps 3a and 4a, and the wraps 3a and 4a are arranged so as to face each other and mesh with each other. A compression space 5 is formed by the wraps 3a and 4a. A suction pipe 6 for allowing the refrigerant to flow into the compression space 5 is provided on the side opposite to the wrap (upward) of the fixed scroll 3. A discharge port 7 for discharging the compressed refrigerant gas into the sealed container 1 is formed at the center of the fixed scroll 3.

  8 is a stator whose outer periphery is fixed to the inner periphery of the hermetic container 1, 9 is a rotor arranged inside the stator, and the stator 8 and the rotor 9 constitute an electric motor unit 10. Yes. Reference numeral 11 denotes a main shaft, and a rotor 9 is attached to the main shaft 11 and is rotatably supported together with the rotor 9. Further, an eccentric portion 11a is provided on the upper portion of the main shaft 11 (on the compression mechanism portion side). An eccentric bearing 4b serving as a bearing for the eccentric portion 11a is provided on the side opposite to the end of the end plate of the orbiting scroll 4 (downward).

  Reference numeral 12 denotes a frame whose outer periphery is fixed to the inner periphery of the sealed container 1, and the frame 12 is provided with a main bearing 13 through which the main shaft 11 passes. An Oldham ring 14 is provided between the lower part of the orbiting scroll 4 and the frame 12 to prevent the orbiting scroll 4 from rotating. The fixed scroll 3 and the frame 12 are fastened with bolts 15. Thereby, the orbiting scroll 4 is supported so as to orbit between the fixed scroll 3 and the frame 12.

  An oil sump 17 for containing the lubricating oil 16 is provided at the bottom of the sealed container 1. A support plate 18 is provided above the oil reservoir 17 so as to cover the oil reservoir 17. The oil reservoir 17 is partitioned from the internal space of the sealed container 1 by the support plate 18.

  Reference numeral 19 denotes a sub-bearing housing provided below the support plate 18, and the sub-bearing housing 19 is fixed to the mounting portion 18 a of the support plate 18 by welding. A spherical bearing 20 serving as a secondary bearing is disposed inside the secondary bearing housing 19. The main shaft 11 is inserted into the cylindrical hole of the spherical bearing 20, and the main shaft 11 is rotatably supported. Below the sub-bearing housing 19, an oil supply mechanism 21 serving as a power source for supplying the lubricant 16 to the main bearing 13, the eccentric bearing 4b, and the like is provided. The oil supply mechanism 21 is provided with a trochoid pump 22 and the like, and functions as a pump when the main shaft 11 rotates.

  An oil supply path 23 through which the lubricating oil 16 is passed is formed inside the main shaft 11. In the middle of the oil supply path 23, an oil supply hole 23 a is formed from the oil supply path 23 toward the outer periphery of the main shaft 11. The oil supply hole 23 a is formed in a portion where the main bearing 13 is located, and supplies the lubricating oil 16 to the main bearing 13.

  Further, as shown in FIG. 2, the support plate 18 is formed with a communication hole 24 that allows the closed container 1 and the oil reservoir 17 to communicate with each other. The communication hole 24 is provided with a filter 25 protruding upward. A plurality of communication holes 24 are formed in the support plate 18, and a plurality of filters 25 are also provided corresponding to the plurality of communication holes 24. The configuration of the filter 25 will be described later. A discharge pipe 26 discharges the refrigerant gas to the outside of the sealed container 1.

  Next, the operation of the scroll compressor will be described.

  When the motor unit 10 is energized, the main shaft 11 rotates together with the rotor 9. When the main shaft 11 rotates, the orbiting scroll 4 orbits due to the rotation of the eccentric portion 11a inserted into the eccentric bearing 4b. The refrigerant flows from the suction pipe 6 into the compression space 5 formed by the wraps 3 a and 4 a of the fixed scroll 3 and the orbiting scroll 4, and the refrigerant is compressed by the orbiting motion of the orbiting scroll 4, and enters the central portion of the fixed scroll 3. The refrigerant gas that has been moved and compressed is discharged from the discharge port 7 into the space in the sealed container 1.

  On the other hand, when the main shaft 11 rotates, the trochoid pump 22 below the hermetic container 1 rotates, and the lubricating oil 16 in the oil reservoir 17 is supplied upward by the pump action. The lubricating oil 16 ascends in the oil supply path 23, and a part of the lubricating oil 16 is discharged from the oil supply hole 23 a to lubricate the main bearing 13. Further, the raised lubricating oil 16 is discharged from the upper end portion of the eccentric portion 11a located above the main shaft 11, reaches the eccentric bearing 4b, and lubricates the eccentric bearing 4b. The lubricating oil 16 that has lubricated the main bearing 13 and the eccentric bearing 4b falls downward due to gravity, and falls on the support plate 18 through the gap between the inner peripheral portion of the hermetic container 1 and the stator 8. At this time, the compressed refrigerant gas and the lubricating oil 16 exist in the sealed container 1 and are mixed in the sealed container 1, and the refrigerant gas becomes a liquid film of the lubricating oil 16 by mechanical stirring of the rotor 9. Wrapped into a foamed state. The refrigerant gas discharged into the hermetic container 1 reaches the support plate 18 through the gap between the hermetic container 1 and the stator 8, the gap between the rotor 9 and the stator 8, and the like. Tries to flow directly into the oil reservoir 17 from the communication hole 24. The foaming state is promoted by this refrigerant gas. When the lubricating oil 16 flows into the oil reservoir 17 in the foamed state, the lubricating oil 16 in which bubbles are mixed is supplied to each part of the bearing. Therefore, the amount of oil supply decreases, and it is difficult to form an oil film at the bearing part, resulting in damage to the bearing. There is a risk of doing. Means for preventing this will be described with reference to FIGS.

  In FIG. 1, a filter 25 protruding upward is provided in the communication hole 24 of the support plate 18. As shown in FIG. 2, a plurality of communication holes 24 are formed in the support plate 18, and a plurality of filters 25 are also provided corresponding to the plurality of communication holes 24. The filter 25 is made of a metal such as stainless steel and is formed in a cylindrical shape (cylindrical in this embodiment). This filter 25 is provided to suppress foaming of the lubricating oil 16. The configuration of the filter 25 will be described with reference to FIGS.

  FIG. 3 is a side view of the filter 25 according to one embodiment of the present invention, and FIG. 4 is a cross-sectional view taken along the line AA of FIG.

  3 and 4, a filter portion 30 is provided on the side surface of the filter 25 formed in a cylindrical shape. The filter unit 30 is made of a metal such as stainless steel and has a mesh shape. The filter unit 30 has a double configuration, and includes an outer filter 30a on the outer peripheral side and an inner filter 30b on the inner side of the outer filter 30a. The openings of the outer filter 30a and the inner filter 30b are different from each other. In this embodiment, the opening of the inner filter 30b is made smaller than the opening of the outer filter 30a. What is necessary is just to select suitably the magnitude | size of the opening of a filter part so that the oil level of the oil sump part 17 may not be cut | disconnected based on the refrigerant | coolant circulation amount.

  The upper surface portion 31 located above the filter 25 has a flat plate shape and closes the upper portion of the filter 25. A mounting portion 32 is formed on the lower side surface of the filter 25 and is press-fitted into the communication hole 24 of the support plate 18 and fixed. The attachment portion 32 may be formed by, for example, forming a screw thread on the outer peripheral surface of the attachment portion 32 and inserting and fixing the filter 25 into the communication hole 24 of the support plate 18. The inside of the attachment portion 32 is open, and the filter portion 30 and the oil sump portion 17 communicate with each other through the communication hole 24.

  In the present embodiment, since the cylindrical filter 25 is formed so as to protrude upward, the filtration area of the filter portion 30 can be increased. In particular, the filtration area of the filter unit 30 is larger than the opening area of the communication hole 24.

  Next, the operation of the filter 25 will be described. The lubricating oil 16 that has lubricated the main bearing 13 and the eccentric bearing 4 b falls downward, and the refrigerant gas is wrapped in the liquid film of the lubricating oil 16 by the mechanical stirring of the rotor 9 to be in a foamed state. The foamed lubricating oil 16 falls onto the support plate 18. Reference numeral 29 shown in FIG. 1 denotes bubbles generated in the lubricating oil 16. When the foamed lubricating oil 16 passes through the filter 25, the foam 29 is broken by the filter unit 30. Moreover, the filter unit 30 has a double structure, and first, the bubbles 29 are broken by the outer filter 30a. Next, the small bubbles 29 that have passed through the outer filter 30a are broken by the bubbles 29 than the inner filter 30b having a smaller opening than the outer filter 30a. The lubricating oil 16 that has passed through the inner filter 30 b is suppressed from being foamed and flows into the oil reservoir 17. Then, the lubricating oil 16 in which the foamed state is suppressed is supplied to the main bearing 13 and the eccentric bearing 4b to lubricate the main bearing 13 and the eccentric bearing 4b. Thereby, damage to the bearing due to an insufficient amount of oil can be prevented.

  Further, the refrigerant gas that has escaped through the gap between the sealed container 1 and the stator 8 and the gap between the rotor 9 and the stator 8 directly flows into the oil reservoir 17 and blows out the refrigerant gas. Try to promote foaming. In this embodiment, the upper surface portion 31 of the filter 25 has a flat plate shape and can prevent the refrigerant gas from blowing out to the oil sump portion 17. The refrigerant gas that has escaped through the gap between the hermetic container 1 and the stator 8 and the gap between the rotor 9 and the stator 8 does not flow directly into the oil sump 17 and first closes the upper side of the filter 25. Collide with part 31. The refrigerant gas that has collided with the upper surface portion 31 is repelled by the upper surface portion 31 and detours to the filter portion 30 on the side surface of the filter 25. Thereby, blowing of the refrigerant gas to the oil sump part 17 can be suppressed, and foaming of the refrigerant gas can be suppressed.

  As a means for suppressing foaming of the lubricating oil, it is conceivable to attach a filter to the communication hole. Since the communication hole is formed with a relatively small hole, if a filter is attached to the communication hole, a sufficient filtration area cannot be secured, and the dropped lubricating oil cannot pass through the filter of the communication hole, so There is a risk of getting stuck. In this case, there is a possibility that the amount of lubricating oil in the oil reservoir is reduced and the lubricating oil cannot be supplied to the bearing.

  On the other hand, in this embodiment, the filter 25 is formed so as to protrude upward, so that the filtration area of the filter portion 30 can be increased, and the stagnation of the lubricating oil 16 on the support plate can be prevented. Can be suppressed. Thereby, the lubricating oil 16 can be stably supplied to each part of the bearing.

  As described above, according to the present embodiment, the filter 25 is provided in the communication hole 24 that communicates with the oil reservoir 17, and the filter 25 is provided so as to protrude upward. The area can be secured, the stagnation of the lubricating oil 16 on the support plate 18 can be suppressed, and the foaming of the oil supplied to the bearing portion can be suppressed. Thereby, the scroll compressor which ensures the oil supply to a bearing and prevents the damage of a bearing part can be provided.

  Moreover, since the filter part 30 is formed in the cylindrical shape, the lubricating oil 16 can be smoothly flowed in from the circumference | surroundings of a cylindrical part.

  Furthermore, since the filter part 30 of the filter 25 has a double structure, it is possible to efficiently blow bubbles. In particular, by providing the outer filter 30a and the inner filter 30b having a smaller filter opening than the outer filter 30a, the passage resistance of the lubricating oil 16 passing through the outer filter 30a can be reduced, and the outer filter 30a cannot be blasted. The foam can be broken by the inner filter 30b, the lubricating oil 16 in which the foamed state is suppressed flows into the oil reservoir 17, and the lubricating oil 16 in which the foamed state is suppressed can be supplied to each part of the bearing. . Thereby, the scroll compressor which ensures the oil supply to a bearing and prevents the damage of a bearing part can be provided.

  In the present embodiment, an example in which the filter 25 is formed in a cylindrical shape is shown, but the present invention is not limited to this. For example, a prismatic shape may be used, and the shape may be selected as necessary.

  Next, another embodiment will be described with reference to FIG. This practical example differs from the previous embodiment in the shape of the filter. FIG. 5 is a side view of a filter 35 according to another embodiment of the present invention.

  In FIG. 5, the filter 35 is attached to the communication hole 24 as in the previous embodiment, and protrudes upward. Reference numeral 36 denotes a filter portion, which is formed in a hemispherical shape. A mounting portion 37 is formed on the lower side surface of the filter 35 and is press-fitted into the communication hole 24 of the support plate 18 and fixed. The attachment portion 37 may be formed by, for example, forming a screw thread on the outer peripheral surface of the attachment portion 37 and inserting and fixing the filter 35 into the communication hole 24 of the support plate 18. The inside of the attachment portion 37 is open, and the filter portion 36 and the oil sump portion 17 communicate with each other through the communication hole 24. The filter portion 36 is made of a metal such as stainless steel and has a mesh shape. In the present embodiment, since the spherical filter 35 is formed so as to protrude upward, the filtration area of the filter portion 36 can be increased. In particular, the filtration area of the filter portion 36 is larger than the opening area of the communication hole 24.

  According to this embodiment, the filter 35 is provided in the communication hole 24 that communicates with the oil reservoir 17, and the filter 35 is provided so as to protrude upward, so that the filtration area of the filter 35 can be secured and supported. The stagnation of the lubricating oil 16 on the plate 18 can be suppressed, and foaming of the oil supplied to the bearing portion can be suppressed. Thereby, the oil supply to a bearing can be ensured and damage to a bearing part can be prevented.

  In addition, the filter part 36 is good also as a double structure similarly to the previous Example. In this case as well, the inner filter openings may be made smaller than the openings of the outer filters, and the openings of the outer filter and the inner filter may be made different from each other.

  As a result, the passage resistance of the lubricating oil 16 that passes through the outer filter can be reduced, and bubbles that could not be broken by the outer filter can be broken by the inner filter. Lubricating oil 16 that has flowed into the reservoir 17 and whose foaming state is suppressed can be supplied to each part of the bearing.

1 is a longitudinal sectional view of a vertical scroll compressor according to an embodiment of the present invention. It is a top view of the support plate 18 of the vertical scroll compressor which concerns on one Example of this invention. It is a side view of the filter 25 which concerns on one Example of this invention. It is AA sectional drawing of FIG. It is a side view of the filter 25 which concerns on the other Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Compression mechanism 3 Fixed scroll 4 Orbiting scroll 11 Main shaft 11a Eccentric part 13 Main bearing 16 Lubricating oil 17 Oil sump part 18 Support plate 21 Oil supply mechanism 22 Trochoid pump 23 Oil supply path 24 Communication hole 25, 35 Filter 29 Foam

Claims (5)

In a vertical scroll compressor provided in a sealed container, comprising a compression mechanism portion having a fixed scroll and a turning scroll, and an electric motor portion having a rotor and a stator for driving the compression mechanism portion,
A main shaft that transmits rotation of the electric motor portion to the compression mechanism portion and includes an eccentric portion, a frame that includes a bearing of the main shaft and that has an outer peripheral portion fixed to the hermetic container, and an opposite side of the eccentric portion of the main shaft A sub-bearing that supports the shaft portion is attached to partition the inner space of the sealed container, an oil sump provided at the bottom of the sealed container partitioned by the support plate, and formed on the support plate A communication hole that communicates with the oil reservoir, and an oil supply passage that is formed inside the main shaft and supplies lubricating oil in the oil reservoir to the compression mechanism.
A vertical scroll compressor comprising a filter projecting upward in the communication hole. In claim 1,
The filter is formed in a cylindrical shape, the upper part of the cylinder is closed, the lower part of the cylinder is connected to the communication hole,
A vertical scroll compressor characterized in that a filter portion through which the lubricating oil passes is provided in a peripheral portion of the cylinder. In claim 2,
The vertical scroll compressor characterized in that the filter section includes an outer filter and an inner filter inside the outer filter, and the openings of the outer filter and the inner filter are different. In claim 3,
A vertical scroll compressor characterized in that the opening of the inner filter is smaller than the opening of the outer filter. In claim 1,
The vertical scroll compressor characterized in that the filter is formed in a hemispherical shape.

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