JPS6140472A - Scroll type compressor - Google Patents

Abstract

PURPOSE:To facilitate a shaft alignment job in time of assembling an enclosed type scroll compressor ever so easy, by securing a stator of a motor to a frame tight enough, while locking an auxiliary bearing, supporting the lower end of a main shaft, to the frame or the stator of the motor by means of screwing. CONSTITUTION:A compression mechanism part 15 of an enclosed type scroll compressor is set up on a frame 14 secured to a hermetically sealed vessel 11. A stator 72 of a motor 16, driving a compression mechanism, is secured to a peripheral wall 49 projected to a lower part from the frame by a screw 74, while the lower end of a main shaft 70 is supported by an auxiliary bearing 77 on a support part 82 connectedly installed in the stator of the motor. Therefore, only when the motor is locked to the frame inside the hermetically sealed vessel, shaft alignment between the main bearing and the auxiliary bearing installed in the frame is performable in an easy manner.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement of a scroll type compression device having a scroll type compression rock structure housed within a closed case.

[Technical Background of the Invention and Problems Therewith] A scroll type compression device has been known as a low-pressure compression device. This compression device has a compression mechanism constructed by combining a pair of scroll blades in the axial direction, and has advantages such as small size, high efficiency, and low vibration.

Incidentally, such a scroll-type compression device generally has a frame fixed to a position slightly above the closed case in a form that partitions the inside of the closed case in the vertical direction5, and a scroll-type compression structure is installed above the frame. A motor for providing driving power to the scroll-type compression mechanism is arranged below the frame, and lubricating oil is stored in the bottom of the sealed case. A scroll-type compression mechanism usually consists of a fixed element and a movable element arranged below the fixed element. A bearing hole is provided vertically through the frame, and the rotating shaft of the motor described above is rotatably supported by the bearing hole.

Further, a joint consisting of an eccentric connecting Akebono bridge and an Oldham mechanism is provided between the upper end of the rotating shaft and the movable element, and the action of this joint causes the movable element to perform a turning motion without rotation.

However, the conventional scroll type compression device configured as described above has the following problems. That is, the rotating shaft of the motor is passed through a bearing hole provided in the frame, and the bearing hole supports the radial load and thrust load applied to the rotating shaft. In this way, if the means for supporting the rotating shaft is a so-called cantilever support structure, a bending moment is likely to act on the rotating shaft, and this force concentrates stress on the bearing surface, which causes seizure. There were many concerns. This phenomenon is especially
This occurs during high-speed operation, and even a small unbalance causes a large force to act on the bearing surface during high-speed operation. therefore,
Usually, a structure is adopted in which the length of the bearing is increased to receive the above-mentioned force over as large an area as possible. In order to realize this method, a structure is generally adopted in which a hollow part is provided in a part of the motor, and a part of the bearing is fitted into this hollow part to suppress the overall axial length. However, with this structure, the efficiency of the motor is low, making it impossible to achieve high-speed rotation.

Therefore, in order to eliminate this problem, a so-called sub-bearing that supports the lower end of the rotating shaft is placed in the lower part of the sealed case, and the two bearings, this sub-bearing and the bearing hole provided in the frame, are installed. However, with this configuration, it is necessary to align both bearings with high precision, and the problem is how to facilitate this alignment.

[Object of the Invention] The present invention has been made in view of the above circumstances, and its purpose is to provide a frame that divides the inside of the sealed case into two, and to connect one end of the rotating shaft of the drive motor. The supporting main bearing and the sub-bearing supporting the other end of the rotating shaft can be easily and precisely aligned, thereby realizing high-speed rotation and facilitating manufacturing and assembly. An object of the present invention is to provide a scroll-type compression device that can be used in a variety of ways.

[Summary of the Invention] The present invention comprises a sealed case, a frame provided to partition the inside of the sealed case into two chambers, and a shape that connects each other in the axial direction to form a compression chamber between them. a scroll-type compression mechanism provided in the one chamber, comprising a fixed element and a movable element each having scroll blades that are formed and mesh with each other in the compression chamber; and a bearing hole provided in the frame. and,
A motor is provided in the other chamber such that one end side of the rotating shaft connected to the rotor is supported by the bearing hole, and the motor is provided between the rotating shaft of this motor and the movable element. In the scroll type compression device, the stator of the motor is fixed to the frame, and the movable element is rotated without rotation using the power of the scroll type compression device. A sub-bearing that supports the other end of the rotating shaft is screwed to the frame or the stator of the motor.

[Effects of the Invention] With the above configuration, the frame, the stator of the motor, the rotating shaft, etc. are generally manufactured with high precision, and the secondary bearing itself is also manufactured with high precision. The secondary bearing can be assembled easily and with high precision compared to one that is fixed to the inner surface of the sealed case by welding, press-fitting, etc. Furthermore, even if there is a large vibration of the rotating shaft after assembly, it can be easily corrected by retightening the screws, inserting a spacer, or the like. Furthermore, since the motor stator and sub-bearing are fixed to the frame, they can be assembled before being assembled into the sealed case, making assembly work easier. Therefore, by supporting the rotating shaft of the motor with two bearings, not only high speed rotation can be realized, but also easy assembly.

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

In FIG. 1, reference numeral 11 indicates a vertically long sealed case, and this sealed case 11 is a cylindrical intermediate case 1.
2, and r11 closing cases 13a and 13b welded so as to close both ends of this intermediate case 12. A frame 14 is fixed at an upper position inside the sealed case 11 in a form that partitions the inside of the sealed case 11 in the vertical direction. A scroll type compression mechanism 15 is arranged above the frame 14, and the frame 1
A motor 16 for providing driving power to the scroll compressor 1115 is disposed below the scroll compressor 1115, and a lubricating oil 17 is housed in the bottom of the sealed case 11.

The scroll-type compression flll 15 has a fixing element 21 and a portion 1 below the fixing element 21, similar to known ones.
It is composed of a movable element 22 arranged at.

The fixing element 21 includes a disk-shaped mirror plate 23, an annular wall 24 protruding from the peripheral edge of one surface of the mirror plate 23, and a portion surrounded by the annular wall 24 having a height approximately equal to that of the annular wall 24. A scroll that sticks out! I25 and a discharge port 26 provided approximately in the center of the end plate 23. The inner edge of the annular wall 24 is formed into a notched surface 27, such as a curved surface with an appropriate curvature or a tapered surface as shown in FIGS. 2(a) and 2(b). In the fixing element 21 configured as described above, the peripheral edge of the annular wall 24 is hermetically fixed to the upper surface peripheral edge of the frame 14 with bolts 28 with the protruding direction of the annular wall 24 and scroll blades 25 facing downward. Incidentally, a cap 29 is formed on the upper surface of the fixing element 21 when it is fixed, and this cap 29 is also fixed integrally with the bolt 28. cap 29
is formed in a size that can form a gap 30 of a predetermined thickness between it and the upper surface of the mirror plate 23, and a hole 31 is formed in a part of the wall that forms this gap 30. Further, a hole 32 for guiding lubricating oil, which will be described later, is formed in a part of the side wall. On the other hand, the movable element 22
The end plate 33 has an outer diameter slightly larger than the inner diameter of the end plate 33.
It is comprised of a scroll l134 protruding from one surface of the scroll blade 25 at a height substantially equal to the height of the scroll blade 25, and a cylindrical portion 35 protruding from the other directly central portion of the end plate 33.

The scroll I of the end plate 33! As shown in FIGS. 3(a) and 3(b), the peripheral edge portion of the surface on which the protruding portion 34 is provided is formed into a notch surface 36 such as a tapered surface. The movable element 22 configured as described above is arranged so that the scroll blades 34
and the scroll blades 25 are engaged with each other, and the peripheral portion of the end plate 33, the end face of the annular wall 24, and the scroll ll3
The end surface of 4, the mirror board 23 and the scrolling wing 25, and the mirror board 33 are attached to the sliding, and this installation state is maintained by the Old Dam Mechanism 40 provided between the above mirror board 33 and the frame 14. .

Oldham t[40 is a key provided at two locations on the same line drawn through the center of the end plate 33 and at the lower peripheral edge of the end plate 33? 7i441a, 41b and this key B)4
A keyway 4 is provided on a line perpendicular to the arrangement direction of 1a and 41b and on the upper surface of the frame 14 as shown in FIG.
2a, 42b, and keys 43a, 43b that fit into the keys 141a, 41b on one surface as shown in FIG. 4, and keys 44a, 44b that fit into the key grooves 42a, 42b on the other surface. The ring 45 has a ring 45. In fact, on both sides of the ring 45, as shown in FIG.
For example, a mesh-like oil groove 46 is formed. Further, each of the key grooves 42a, 42b.

On the inner surfaces of 41a and 41b, an enlarged stepped portion 47 is formed to reduce the sliding area with the key, as represented by the keyway 42b in FIG.

The frame 14 is provided with a projecting peripheral wall 49 having an outer diameter smaller than the inner diameter of the intermediate case 12 at the lower peripheral edge thereof. Furthermore, the movable element 22 is located at the center of the frame 14.
A bearing hole 51 eccentric to the axis of the cylindrical portion 35 is provided vertically penetrating therethrough, and a portion of the bearing hole 51 located on the cylindrical portion 35 side is formed to have a large diameter. The frame structure on the larger diameter side is specifically constructed as shown in FIG. That is, an annular wall 52 is formed on the outermost side, which has an outer diameter approximately equal to the inner diameter of the sealed case 11 and has an inner diameter larger than the inner diameter of the annular wall 24, and the annular wall 24 is tightened and fixed by the bolt 28. The annular receiver that receives the ring 45 on the inner side is formed with a surface 55 lowered one step, and the annular receiver that receives the thrust force reduction [159, which will be described later], is formed with a surface 56 that is further lowered on the inside. has been done. The surface of each receiver is divided into a plurality of parts in the circumferential direction by grooves 57 provided radially, and at least one of the grooves 57 communicates with a hole 58 provided in the wall of the frame 14 that directly connects the inside and outside. ing. Note that the key grooves 42a and 42b have a receiving surface 5.
5.

Specifically, the above-mentioned thrust force reduction 1159 is performed as shown in FIG.
As shown in a), (b), and (c), the annular receiver includes an annular body 60 fitted and supported by the surface 56, an annular groove 61 carved on the upper surface of this annular body 60, and an annular groove formed on the upper surface. Annular grooves 62.63 shallower and narrower than the annular groove 61 formed on the inside and outside of the annular groove 61, respectively, and these annular grooves 62.63.
Each part is attached to the inside so that it protrudes outward,
For example, it is composed of seal rings 64° and 65° made of tetrafluoroethylene. A tapered surface 66 is formed at the lower end of the outer peripheral surface of the seal ring 64, as shown in FIG. ing. Further, bottomed holes 67 are formed at four positions in the circumferential direction of the annular groove 61 to have the same depth as the annular groove 61 and communicate the annular groove 61 with the annular grooves 62 and 63. The interior of the end plate 33 is surrounded by an annular body 60, seal rings 64, 65, and the lower surface of the end plate 33 when the thrust force reducing device 59 is attached as shown in FIG. Hole 6 that always communicates the space between the medium pressure ports s and s' of the compression chamber P
8.69 is formed.

A rotating shaft 70 of the motor 16 is rotatably supported in the bearing hole 51 of the frame 14 .

The motor 16 has its rotor 71 fixed to the outer periphery of the rotating shaft 70 and the stator core 73 of its stator 72 fixed to the lower end surface of the projecting peripheral wall 49 provided on the frame 14 by screws 74. This is a squirrel cage induction motor.

The rotating shaft 70 has a large diameter portion 75 formed in a portion located in the large diameter portion of the bearing hole 51, and a small sleeve 76 that fits into the aforementioned cylindrical portion 35 is protruded from the large diameter portion 75. There is.

Further, the lower end of the rotating wheel 70 is lr! 1m oil 17
It is formed to have a length that extends through the middle oil immersion 7, and its lower end is supported by a sub-bearing 77 fixed to the stator core 73 of the stator 72.

The secondary bearing 77 is roughly composed of a radial bearing material 78 and a thrust bearing material 80 fixed to the bearing material 78 with screws 79.

The radial bearing material 78 includes a cylindrical portion 81 that supports the radial load at the lower end of the rotating shaft 70, and extends radially outward from the cylindrical portion 81, and then extends toward the stator core 73 to attach the screws to the stator core 73. 74 and a fixed support part 82. A plurality of holes 83 are formed in the support portion 82 in the circumferential direction. on the other hand,
The thrust bearing material 80 is constituted by an annular plate that slides on the lower end surface of the rotating shaft 7o.

Inside the rotation @ 70, there is a hole 9 through which the lubricating oil 17 is pumped up to the bearing surface and the fitting part between the small shaft 76 and the cylindrical part 35 by a centrifugal pump action.
0 is formed. The shape of the entrance portion of this hole 90, that is, the portion located at the lower end of the rotating shaft 70, includes a portion 91 extending upward from the center of the lower end surface of the rotating shaft 70, and a portion 91 that extends in the radial direction of the cylinder. a portion 92 extending to the inner surface of the portion 19;
This portion 92 is combined with a portion 93 extending vertically at the peripheral edge position within the rotating shaft 7o so as to intersect at right angles.

Furthermore, a suction pipe 110 is connected to a side wall of the intermediate case 12 of the sealed case 11 located between the scroll compressor 14M15 and the motor 16, and a suction pipe 110 is connected to the outlet of the suction pipe 110. A hole 111 is formed in the wall of the projecting peripheral wall 49. In addition, occlusion case 1
A discharge pipe 113 is connected to the wall of 3a in communication with a space 112 formed between this wall and the fixing element 21.

In addition, 114 in FIG. 1 is an annular wall 24 for returning the lubricating oil pushed out into the space 112 downward from the frame 14.
115 indicates a balance weight, 116 indicates a power supply connection t1 to the motor 16, and 117 indicates a hole through which lubricating oil passes.

Next, the operation of the compression device configured as described above will be explained.

First, when power is supplied to the motor 16, the rotating shaft 70 starts rotating. This rotation is smoothly maintained by both the bearing hole 51 and the sub bearing 77. The rotational force of the rotating shaft 70 is then transmitted to the movable element 22. The cylindrical portion 35 of the movable element 22 has a small shaft 76 provided eccentrically with respect to the rotating shaft 70.
Since the movable element 22 is fitted with the movable element 22 and supported by the Oldham [1t40], the movable element 22 performs a turning movement without rotation. Therefore, the scroll blades 34 provided on the movable element 22 also perform a swirling motion.

Along with this swirling movement, the volume of the compression chamber P formed between the scroll 125 and the scroll blade 34 is periodically reduced, and the compressed gas is thereby transferred to the discharge port 26.
It is discharged from. The discharged high pressure gas is sent out from the discharge pipe 113 through a gap 30 formed by the cap 29, a hole 31 provided in the cap 29, and a space 112. On the other hand, when the movable element 22 pivots as described above, a cutout surface 36 is formed between the upper surface peripheral edge of the mirror plate 33 of the movable element 22 and the inner edge of the annular wall 24 of the fixed element 21.
．． 27 effectively acts to compress the compression chamber P.
The receiver, whose peripheral edge is formed on the frame 14, is always in communication with the space on the surface 55. The above-mentioned space communicates with the hole 58 through the groove 57 provided radially in the frame 14, and this hole 58 communicates with the suction pipe 11 through the hole 11.
0, the low-pressure gas ends up in the suction pipe 1.
10 to hole 111 to hole 58 to the receiver are sucked into the low pressure boat in the compression chamber P via the space on the surface 55, and the function as a compression device is exhibited here. In this case, even if Q liquid such as a refrigerant is mixed in the low pressure gas that has flowed in through the suction pipe 110, this liquid will fall downward while moving to the hole 58, and the lubricating oil 17 will accumulate. Try to move to the bottom where it is. Since the motor 16 generates heat by itself, the fallen liquid is gasified by the heat, mixes with the flow of the already gasified liquid, and moves into the compression chamber P. Therefore, the space in which the motor 16 is installed has exactly the same function as a gas-liquid separator.

On the other hand, when the motor 16 rotates as described above, the lubricating oil 1
7 is pumped upward into the hole 90 by the centrifugal pumping action associated with the shape of the hole 90. This pumped up lubricating oil lubricates the inner circumferential surface of the bearing hole 51, then lubricates the fitting part between the small shaft 76 and the cylinder part 35, and then lubricates the fitting part of the small shaft 76 and the cylinder part 35.
to lubricate the part where Oldham IN 4R40 is provided, and then a portion flows downward from the hole 58,
The remainder enters the compression chamber P and lubricates the sliding parts within the compression chamber P. The lubricating oil that has entered the compression chamber P is Q
After being finally discharged from the discharge 026, it flows downward through the holes 32 and 114 provided in the cap 29. Therefore, high pressure gas containing no lubricating oil is discharged from the discharge pipe 113.

Further, as described above, when the movable element 22 performs a rotational motion 2 and a compression operation is performed, the pressure inside the compression point P becomes high, so the movable element 22 receives a downward thrust force, and this force Number 40. The support of the frame 14 touches the surface 55, etc., and there is a possibility that a seizure phenomenon may occur in these elements. However, in the case of this embodiment, the thrust force reduction mechanism 59 prevents the occurrence of the seizure phenomenon in the following manner.

That is, the annular space surrounded by the annular body 60, the seal rings 64, 65, and the end plate 33 of the thrust force reduction mechanism 59 is always connected to the so-called medium pressure ports 1-8. of the compression chamber P via the holes 68, 69. It leads to S'. Therefore, the end plate 33 receives an upward force due to the gas pressure in the annular space, and the presence of this force reduces the downward thrust force that the end plate 33 receives. This reduction prevents the occurrence of the burn-in phenomenon. In addition, movable element 2
The downward thrust force applied to 2 pulsates as the position between the compression chambers changes. Therefore, there is a risk that high-pressure gas may leak from the thrust force reduction mechanism 59 to the low-pressure side. However, in this embodiment, as shown in FIG. Groove 62.63
Since the seal rings 64 and 65 are provided with a bottomed hole 67 that communicates with
A pressing force acts on the bottom surface of the Therefore, this pressing prevents high pressure gas from leaking.

In this way, the upper end of the rotating shaft 70 is supported by the bearing hole 51 provided in the frame 14, and the lower end is supported by the sub bearing 77. The sub bearing 77 is fixed to the frame 14 via the stator core 73 of the motor 16. The frame 14, stator core 73, rotating shaft 70, etc.
Noh is generally produced with high precision. therefore,
As long as the manufacturing accuracy of the secondary bearing 77 is increased to a certain extent, the axis of the secondary bearing 77 and the axis of the bearing hole 51 will match,
In addition, the secondary bearing 77 can be assembled semi-automatically so that the thrust bearing material 80 also functions well. Therefore, the support of the rotating shaft 70 can be stabilized, and high-speed rotation can be realized.

In particular, since the sub-bearing 77 is fixed in the above-described relationship, the sub-bearing 77 and the motor 16 can be assembled at a stage before being assembled into the sealed case 11. therefore,
Not only can the assembly work be made very easy, but even if the rotation shaft 70 has a large vibration after assembly, the screw 74 can be
Correction work such as retightening can be easily performed, and the above-mentioned effects can be obtained after all.

Note that the present invention is not limited to the embodiments described above. That is, in the embodiment, the screws for fixing the stator core 73 to the frame 14 and the screws for fixing the secondary bearing 77 to the stator core 73 are shared, but it is possible to use separate screws. You can also do this. In this way, the degree of freedom during correction can be increased. Further, the sub-bearing may be configured in a two-piece structure consisting of a so-called sub-bearing main body and a supporting member connected to the main body. Further, as shown in FIG. 8, a projecting peripheral wall 4 formed on the frame 14
9 may be extended downward, the stator core 73 may be fixed to the inner surface of the projecting peripheral wall 49, and the sub-bearing 77a may be fixed to the lower end surface of the projecting peripheral wall 49 with screws 120. Of course, a part of the projecting peripheral wall may be formed from a separate member. Further, the projecting peripheral wall may be replaced with a plurality of support legs. Furthermore, it goes without saying that the present invention can also be applied to an apparatus in which the motor is placed above and a scroll type compression mechanism is placed below, or to an apparatus in which the axis is installed horizontally.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a scroll-type compression device according to an embodiment of the present invention, FIG. 2(a) is a bottom view of a fixing element in the same device, and FIG. Figure 3 (a) is a sectional view under installation conditions when cut along the line and viewed in the direction of the arrow.
) is a top view of the movable elements in the device, and (b) is (
B-Bl in a)! 4 is a partially cutaway exploded perspective view showing only the upper part of the frame in the same device, FIG. 5 is a plan view of the main part of the Oldham rock structure in the same device, and FIG. 6 is the Oldham 14 in the same device. Figure 7 (a) is a top view of the thrust force reduction mechanism built into the device, and Figure 7 (b) is a diagram for explaining the shape of the keyway of the IfIS.
), Figure (C) is a diagram for explaining the shape of the seal ring incorporated in the same ti1M, and Figure 8 is a diagram of a scroll type compression device according to another embodiment of the present invention. FIG. 11... Sealed case, 14... Frame, 15...
・Scroll type compression body structure, 16...Motor, 17...
・U oil, 21... Fixed element, 22... Movable element,
25.34...Scroll blade, 26...Discharge port, 4
0...Orgeum structure, 49...Protruding wall, 51...
Bearing hole as main bearing, 70... Rotating shaft, 71...
Rotor, 72... Stator, 77... Secondary bearing, 90...
... Hole for centrifugal pump, 110... Suction pipe, 113.
...Discharge pipe. Applicant's Representative Patent Attorney Takehiko Suzue Figure 1 Figure 2 Figure 3 (a) Figure 4 Figure 5 @6 Figure 7 (a) Figure '58

Claims (3)

[Claims] (1) A sealed case, a frame provided to partition the inside of the sealed case into two chambers, each formed in a shape that is joined in the axial direction to form a compression chamber between them. A scroll-type compression mechanism is provided in one of the chambers and is comprised of a fixed element and a movable element each having scroll blades that engage with each other in the compression chamber, a bearing hole provided in the frame, and a scroll-type compression mechanism provided in the one chamber; A motor provided in the other room such that one end side of the rotating shaft connected to the rotor is supported;
a scroll-type compression joint provided between the rotary shaft of the motor and the movable element, and which performs gas compression by causing the movable element to perform a rotational movement without rotation with the power of the motor; In the scroll type compression device, the stator of the motor is fixed to the frame, and a sub-bearing that supports the other end of the rotating shaft is screwed to the frame or the stator of the motor. Device. (2) The sub-bearing is composed of a sub-bearing main body having a radial bearing surface and a thrust bearing surface, and a support member inserted between the sub-bearing main body and the frame or the stator. Scroll type compression device according to claim 1, characterized in that: (3) The sub-bearing main body has a radial bearing surface and includes a radial bearing material screwed to the frame or the stator, and a radial bearing surface of the radial bearing material screwed to the radial bearing material. and a thrust bearing material having a thrust bearing surface forming one bearing.
Scroll-type compression device as described in Section 1.