JPH057988U - Rotary compressor - Google Patents

Abstract

(57) [Abstract] [Purpose] In the rotary compressor, the sleeve that was conventionally used for the lubricating oil discharge prevention member was omitted,
The labor and cost required for manufacturing and assembling are reduced, and the lubricating oil discharge preventing function can be sufficiently exerted. A lubricating oil discharge prevention member 6 is arranged above the upper end side coil end 13 of the rotor 2a and has a circular hole 1 in the center.
6 and a cylindrical portion 1 fitted in a circular hole 16 and tapered so that the lower end side has a small diameter.
5b and a disc cover 15 integrally formed with a flange portion 15b that covers the upper surface of the disc 14 that horizontally extends from the upper end to the outer peripheral side. The disc 14 is fixedly supported by a plurality of support pins 18 protruding upward from the upper end coil end 13 of the rotor 2a. The lower end of the cylindrical portion 15a of the disc cover 15 is arranged at the joint between the rotor 2a and the rotating shaft.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vertical rotary compressor applied to a refrigeration cycle device and the like, and more particularly to a rotary compressor having an improved lubricating oil discharge prevention member attached to an electric element.

[0002]

[Prior Art]

 Conventionally, as this type of rotary compressor, for example, one having a structure shown in FIG. 8 is known. That is, an electric element 2 including a rotor 2a and a stator 2b is provided on an upper portion of the hermetic case 1, and a compression element 3 including a rotating piston 3a and a cylinder 3b is provided on a lower portion of the hermetic case 1, and a vertical shaft connected to the rotor 2a of the electric element 2 is provided. The rotary shaft 4 which is a rotational drive of the rotary piston 3a of the compression element 3 drives the rotary piston 3a to rotate.

Lubricating oil 5 is contained in the inner bottom of the case 1, and the lubricating oil 5 is sucked upward by a pump provided at the lower end of the rotary shaft 4 and supplied to the sliding portion of the compression element 3. It is used for lubrication.

By the way, in such a compressor, in order to prevent the sucked lubricating oil 5 from being discharged above the electric element 2, a disc-shaped lubricating oil is discharged to the upper end side of the rotor 2a of the electric element 2. The prevention member 6 is attached so as to be integrally rotatable.

FIG. 8 and FIG. 9 show a conventional configuration of the lubricating oil discharge prevention member 6. That is, the lubricating oil discharge prevention member 6 is mainly composed of a disc 9, and the disc 9 has a tapered vertical tubular portion 9a having a large diameter on the upper side, and the tubular portion 9a. It has a horizontal disk main portion 9b which extends circumferentially from the upper end to the outer peripheral side, and a peripheral wall portion 9c which hangs from the peripheral edge portion of the disk main portion 9b. The lower end of the cylindrical portion 9a of the disc 9 is connected to the upper end of the sleeve 10 fitted to the rotary shaft 4 via the spring washer 11 and the C ring 12 so as to be integrally rotatable, and the disc main portion 9b is connected to the coil end. It covers the top surface for 10 minutes.

The refrigerant gas sucked from the suction pipe 7 during operation is compressed by the compression element 3 and then rises through the gap of the electric element 2 and is discharged from the discharge pipe 8. The lubricating oil mist that has mixed with the medium gas and reached above the compression element 3 is guided to the lower surface of the disk main portion 9b along the outer peripheral surface of the cylindrical portion 9a of the disk 9 and flows toward the outer peripheral edge side by centrifugal force. The latter is separated from the refrigerant gas due to the mass difference, and only the oil component is dropped and collected from the peripheral wall portion 9c by its own weight.

[0007]

[Problems to be solved by the device]

 In the conventional configuration described above, the disk 9 is only subjected to the rotational load of itself and the pressure of the refrigerant gas, the oil mist, etc., and does not require particularly high strength. It can be easily molded.

However, the sleeve 10 supporting the disc 9 needs to have a certain strength or more in order to bear the disc load and to be attached to the rotary shaft 4. Therefore, the sleeve 10 is generally a cut molded product made of a thick metal material, and is generally washed with chlorofluorocarbon or the like after cutting and before assembly of the rotary compressor. For this reason, conventionally, much work has been required for manufacturing and cleaning the sleeve 10, and there has been a problem that manufacturing and assembling of the lubricating oil discharge prevention member 6 is expensive.

The present invention has been made in view of such circumstances, and a sleeve conventionally used for a lubricating oil discharge prevention member can be omitted, and labor and cost required for manufacturing and assembling can be reduced, and It is an object of the present invention to provide a rotary compressor capable of sufficiently exerting a lubricating oil discharge prevention function.

[0010]

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides an electric element on an upper part of a hermetically sealed case, and a lower part of the case is driven to rotate by a rotary shaft by the electric element. In a vertical rotary compressor in which a compression element is provided, and a disk-shaped lubricating oil discharge prevention member for preventing upward discharge of lubricating oil is attached to the rotor of the electric element so as to rotate integrally, The oil discharge prevention member is disposed above the coil end portion on the upper end side of the rotor, has a circular hole at the center, and has a mounting recess having a plurality of mounting holes formed in the circumferential direction; And a disc cover integrally formed with a cylindrical portion fitted in the circular hole of the cylindrical portion and extending from the upper end of the cylindrical portion to the outer peripheral side to cover the upper surface of the disc. A plurality of support pins protruding upward from the coil end portion of the upper side of the disk are inserted into the mounting holes to fix and support the disk, and the lower end of the cylindrical portion of the disk cover is connected to the rotor and the rotary shaft. It is characterized in that it is arranged at the joint part of.

[0011]

[Action]

 According to the present invention, since the lubricating oil discharge prevention member is configured by the disc and the disc cover which are separate bodies from each other, the shape of each component can be relatively simplified, but each component requires extra large strength. Not. Therefore, these parts can be easily formed by pressing or the like.

Further, since the disk is fixedly supported on the coil end portion of the rotor, which is an electric element, via the plurality of support pins, the sleeve used conventionally is not required. Therefore, a cut-molded product made of a thick metal material can be omitted, and cleaning using chlorofluorocarbon or the like is not required, so that manufacturing and assembling of the lubricating oil discharge prevention member can be performed easily and at low cost.

Moreover, since the lower end of the cylindrical portion of the disc cover is arranged at the joint between the rotor and the rotary shaft, this cylindrical portion enables the lubricating oil guide equivalent to that of the conventional sleeve to prevent the lubricating oil discharge. The function can be fully exerted as in the past.

[0014]

【Example】

 An embodiment of the rotary compressor according to the present invention will be described below with reference to FIGS. In addition, about the component similar to a prior art example, the same code | symbol as FIGS. 8-10 is attached | subjected to the corresponding part of drawing, and the overlapping description is abbreviate | omitted.

As shown in FIG. 1, an electric element 2 is provided on an upper part of a hermetically sealed case 1, and a compression element 3 rotatably driven by an electric element 2 via a rotary shaft 4 is provided on a lower part of the case 1. Has been. A disc-shaped lubricating oil discharge prevention member 6 that prevents the lubricating oil from being discharged upward is attached to the upper portion of the rotor 2a of the electric element 2 so as to be integrally rotatable.

As shown in FIGS. 2 and 3, the lubricating oil discharge prevention member 6 is composed of a disc 14 arranged above the upper end coil end portion 13 of the rotor 2 a, and a disc cover 15 covering the disc 14. Has been done.

The disk 14 is formed by pressing a sheet metal, and has a disk main portion 14a in which a circular hole 16 having a diameter slightly larger than that of the rotating shaft 4 is formed in the center portion, and an outer peripheral edge portion of the disk main portion 14a. A peripheral wall portion 14b that hangs down from the disk and a mounting recess 14c in which the disk main portion 14a is depressed at a plurality of positions in the circumferential direction and mounting holes 17 are formed in the bottom wall portion are integrally formed.

The disc cover 15 is also formed by pressing a metal plate, and the disc cover 15 is fitted in a circular hole 16 in the center of the disc 14 and has a vertical cylindrical portion having a small diameter from the upper end side to the lower end side. 15a and a flanged portion 15b that integrally extends from the upper end of the cylindrical portion 15a to the outer peripheral side and covers the upper surface of the disk 14 are integrally formed.

On the other hand, at the upper end side coil end portion 13 of the rotor 2a, a plurality of support pins 18 also serving as balancers are provided at upper portions in the circumferential direction in correspondence with the mounting concave portions 14c and the mounting holes 17 of the disk 14. Is projected toward. The upper end portion 18a of each support pin 18 has a small diameter through the step portion 18b, and the small diameter upper end portion 18a can be inserted into the mounting hole 17 of the mounting recess 14c of the disk 14.

When mounting the disk 14, the upper end portion 18 a of each support pin 18 is inserted into the mounting hole 17 and the mounting recess 14 c is placed on the stepped portion 18 b of each support pin 18 to mount the support pin 18. The disk 14 is supported on the disk 14, and press working is performed in this state to crimp the upper end portion 18 b of the support pin 18 on the mounting recess 14 c of the disk 14, thereby fixing the disk 14 to the support pin 18. As for the disc cover 15, the tubular portion 15a is fitted into the circular hole 16 at the center of the disk 14 from above, and the lower end of the tubular portion 15a is arranged at the joint between the rotor 2a and the rotary shaft 4. To do.

As shown in FIG. 2 by the above-mentioned mounting, the disc 14 is arranged such that the disc main portion 14a covers the upper end coil end portion 13 of the rotor 2a and the peripheral wall portion 14b covers the coil end portion 13. The disc cover 15 is fixed in a surrounding arrangement and covers the upper surface of the disc portion 14 by the flange portion 15b so as to cover the upper end portion 18a of the support pin 18 which is a caulking portion, and the lower end of the tubular portion 15a. Will have an oil guide function.

Therefore, during the compression operation, the lubricating oil mist that has reached above the compression element 3 together with the refrigerant gas above the electric element 2 along the outer peripheral surface of the cylindrical portion 15 a of the disk cover 15 is the main disk of the disk 14. After being guided to the lower surface of the portion 14a and flowing toward the outer peripheral edge by centrifugal force, it is separated from the refrigerant gas due to the mass difference, and only the oil component is dropped and collected from the peripheral wall portion 14b by its own weight.

According to the present embodiment, the lubricating oil discharge prevention member 6 is constituted by the disc 14 and the disc cover 15 which are separate from each other, so that the shape of each component can be made relatively simple, and each component can be relatively simplified. Does not require extra great strength. Therefore, these parts can be easily formed by pressing or the like.

Further, since the disk 14 is fixedly supported on the coil end 13 of the rotor 2a, which is the electric element 2, via the plurality of support pins 18, the sleeve used conventionally is not required. Therefore, a cut-molded product made of a thick metal material can be omitted, and cleaning using chlorofluorocarbon or the like is not required, so that manufacturing and assembling of the lubricating oil discharge prevention member 6 can be performed easily and at low cost.

Moreover, since the lower end of the tubular portion 15a of the disc cover 15 is arranged at the joint between the rotor 2a and the rotary shaft 4, the tubular portion 15a enables a lubricating oil guide equivalent to that of a conventional sleeve. The lubricating oil discharge prevention function can be fully exerted as in the past.

4 to 7 show the thrust structure of the rotary shaft of the rotary compressor.

On the rotary shaft 4 of the rotary compressor, various axial vertical loads such as the self-weight of the electric element 2, the skew force or the magnet center force act. To support this axial load, a thrust structure is applied to the lower end of the rotary shaft 4.

In the present embodiment, as shown in FIG. 4, a thrust plate 22 that abuts the lower end surface of the rotary shaft 4 is provided at the lower end of the sub-bearing 21 that supports the lower end portion of the rotary shaft 4. Is fixed to the sub-bearing 21 by a cover packing 23 and a valve cover 24 that are in contact with each other from below.

The thrust plate 22 has a substantially circular shape, and has a small hole 22a for circulating lubricating oil in the center thereof.

The cover packing 23 is a ring-shaped member made of an elastic material, and as shown in FIGS. 5 and 6, a disk-shaped portion 23a having a hole 23A for lubricating oil distribution in the center and an outer portion thereof. It is composed of a cylindrical portion 23b that rises from the peripheral edge toward the one side surface. The disk-shaped portion 23a is formed with a pair of ring-shaped seal portions 25a and 25b having different diameters that are bent so as to project to the respective side surfaces. Further, a plurality of cut-and-raised locking portions 26a, 26b having different sizes are formed on the inner surface of the tubular portion 23b at intervals in the circumferential direction.

The valve cover 24 has a bowl shape, and has a hole 24a for circulating lubricating oil in the center of the bottom and a flange 24b on the outer peripheral side.

As shown in FIG. 4, the seal portion 25a formed by projecting and deforming to the inner peripheral side of the cover packing 23 is directed upward, and the thrust plate 22 is abutted and supported on the seal portion 25a. The locking portions 26a and 26b of the shaped portion 23b are locked to the outer peripheral surface of the boss portion of the sub bearing 21. Further, the flange portion 24b of the valve cover 24 is fastened to the flange portion 21a of the sub-bearing 21 by a fastening tool 27 such as a bolt, and the valve cover 24 allows the downward sealing portion 25b of the outer peripheral side of the cover packing 23 from the lower side. Abutted and supported.

Thus, the cover packing 23 elastically holds the thrust plate 22 against the sub-bearing 21 while partitioning the space inside the valve cover 24 by the seal portions 25a and 25b, whereby the outer peripheral portion of the space is muffled. The portion 28 holds the seal.

By the way, in this embodiment, the seal portion 25a on the inner peripheral side of the cover packing 23 is formed on the inner peripheral side of the boss outer peripheral surface of the sub bearing 21, and the seal portion 25b on the large diameter side is formed. Is formed on the outer peripheral side of the outer peripheral surface of the boss portion 27 of the sub-bearing 21, and when the elastic deformation amount of the cover packing 23 becomes unnecessarily large, excessive deformation causes the outer peripheral surface of the boss of the sub-bearing 21. It is supposed to be absorbed by the side. According to this structure, unlike the conventional structure in which both the inner and outer seal portions of the cover packing are formed within the inner and outer circumferential surfaces of the boss portion 21b of the sub-bearing, the cover packing is different. When the rigidity of 23 is large, the sub-bearing is not deformed by the influence of the contact force on the sub-bearing side, and the structural reliability can be improved.

FIG. 7 is a graph showing the action of such a cover packing 23. The vertical axis represents the load on the seal portions 25a and 25b, and the horizontal axis represents the deviation of the seal portions 25a and 25b with respect to the same load. There is. A characteristic line A in the drawing shows a conventional example in which the distance between the seal portions 25a and 25b is small, and a characteristic line B shows this embodiment in which the distance between the seal portions 25a and 25b is large. The rigidity of the cover packing 23 is governed by the distance between the seal portions 25a and 25b, the plate thickness, and the like. When a material having the same plate thickness is used, the displacement of the cover packing 23 with respect to the tightening load increases as the distance between the seal portions 25a and 25b increases. On the other hand, the boss height of the sub-bearing 21, the depth of the valve cover 24, the thickness of the thrust plate 22, and other factors related to the precision of machining the parts require a certain range for the tightening margin of the cover packing 23. Become.

In the case of the conventional cover packing, as shown by the characteristic line A in FIG. 7, an excessive load acts on the bearing boss in the same tightening seat size, and the bearing by tightening the valve cover is While the amount of deformation was large, which adversely affected performance and reliability, according to this example, the load during tightening can be suppressed to a small value, and therefore the amount of bearing deformation due to tightening the valve cover is small. can do .

[0037]

[Effect of the device]

 As described above, according to the rotary compressor of the present invention, the disk serving as the lubricating oil discharge prevention member is configured to be supported by the plurality of support pins protruding upward from the coil end portion on the upper end side of the rotor. By doing so, it is possible to omit the sleeve that is a cutting part that has been used in the past, and reduce the labor and cost required for manufacturing and assembling, and it is possible to fully exert the lubricating oil discharge prevention function. ..

[Brief description of drawings]

FIG. 1 is an overall sectional view showing an embodiment of a rotary compressor according to the present invention.

FIG. 2 is an enlarged cross-sectional view showing a main part of FIG.

FIG. 3 is an exploded perspective view corresponding to FIG.

FIG. 4 is a sectional view showing a thrust structure of a rotary compressor.

5 is a cross-sectional view showing an enlarged main part of FIG.

FIG. 6 is a plan view of FIG.

FIG. 7 is an operation explanatory view of the thrust structure shown in FIG.

FIG. 8 is an overall sectional view showing a conventional example of a rotary compressor.

9 is an enlarged cross-sectional view showing a main part of FIG.

FIG. 10 is an exploded perspective view corresponding to FIG.

[Explanation of symbols]

 1 Case 2 Electric Element 2a Rotor 3 Compression Element 4 Rotating Shaft 6 Lubricant Discharge Prevention Member 13 Coil End 14 Disk 15 Disk Cover 15a Cylindrical Part 15b Collar Part 16 Circular Hole 18 Support Pin

Claims (1)

Claims for utility model registration: 1. An electric element is provided on an upper part of a hermetically sealed case, and a compression element is rotatably driven by the electric element via a rotary shaft at the lower part of the case. In a vertical rotary compressor in which a disc-shaped lubricating oil discharge preventing member for preventing upward discharge of lubricating oil is integrally rotatably attached to a rotor portion of an element, the lubricating oil discharge preventing member is provided on an upper end side of the rotor. A disk having a mounting recess, which is disposed above the coil end portion, has a circular hole formed in the center thereof, and has a plurality of mounting holes formed in the circumferential direction, and a tubular portion fitted into the circular hole of the disk. And a disc cover integrally formed with a flange-shaped portion that spreads from the upper end of the cylindrical portion to the outer peripheral side and covers the upper surface of the disc, A plurality of projecting support pins are inserted into the mounting holes to fix and support the disc, and a lower end of a cylindrical portion of the disc cover is arranged at a joint portion between the rotor and a rotary shaft. compressor.