JPH0330683B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a scroll compressor used as a refrigerant compressor.

[Conventional technology]

The principle of the scroll fluid machine will be briefly described.

Figure 3 shows the basic components and compression principle when a scroll fluid machine is used as a compressor. In the figure, 1 is a fixed scroll, 2 is an oscillating scroll, Pi is a suction chamber, and 105 is a 4 and 5, 1 is a fixed scroll, 101 is a base plate of the fixed scroll 1, 102 is a spiral side plate formed on the fixed scroll base plate 101, 2 is an oscillating scroll, and 201 is an oscillating scroll. The base plate of the movable scroll 2, 201 is the oscillating scroll base plate 20
A spiral side plate 204 is a shaft provided on the opposite side of the spiral side plate 202 on the base plate 201 of the oscillating scroll, and a spiral side plate 204 is formed on the side plate 1 of both scrolls.
A compressor P is formed between 02 and 202. Also
Pi is a suction chamber, and 105 is a discharge hole.

A sealing plate 3 is attached to the edge of each of the spiral side plates 102, 202 that slides on the respective base plates 101, 201. 4 is a main shaft; 5 is an oscillating bearing that rotatably supports the oscillating scroll shaft 204; 8
Reference numeral 601 denotes an Oldham joint that prevents rotation of the orbiting scroll 2, and 601 a thrust bearing that slidably supports the base plate 201 of the orbiting scroll 2. P is a compression chamber. Further, O is the center of the fixed scroll 1.

The fixed scroll 1 and the oscillating scroll 2 have the same shape and opposite spiral directions 1a and 2a.
The shapes of these spirals 1a and 2a are composed of involute curves, circular arcs, etc., as is conventionally known.

Next, the operation will be explained. The fixed scroll 1 is stationary with respect to space, and the oscillating scroll 2 is assembled with a phase shift of 180° relative to the fixed scroll 1.
It performs orbital motion without rotating around the axis, and moves at 0 degrees, 90 degrees, 180 degrees, and 270 degrees, as shown in Figure 2 a to d. In the figure, gas confinement in the suction chamber Pi is completed at the 0° state shown in Figure 3a, and the spirals 1a and 2a
A compression chamber P is formed between the two. As the orbiting scroll 2 moves, the compression chamber P gradually reduces its volume, and the gas therein is compressed and discharged from the discharge port 105 provided at the center of the fixed scroll 1.

The outline of the device known as a scroll compressor is as follows.

Next, the specific configuration and operation of the scroll compressor will be explained. 4 and 5 show the structure of an embodiment of a scroll compressor as shown in, for example, Japanese Patent Application No. 59-42503, and in particular, the scroll compressor is applied to a totally hermetic refrigerant compressor. This is the case when

6 is a first frame, 67a is a pilot part provided on the lower surface side of the first frame 6, 607 is an Oldham groove provided on the upper surface of the first frame 6 in a diametrical direction and provided in a pair on the left and right sides; 1 frame 6
A plurality of oil return holes are provided at predetermined intervals in the circumferential direction. Further, 614b is a gas passage formed by recesses 600c extending in the axial direction at predetermined intervals on the outer circumference of the first frame 6 and the inner circumferential surface of the lower shell 9013, which serves as a passage for suction gas pressure during compressor operation. It is configured like this. Reference numeral 602 denotes a first main bearing, which is machined concentrically with the spigot part 67a. 7 is a second frame, 7d is a plurality of motor mounting legs protruding downward from the outer peripheral part of the second frame 7 in a finger shape, and 7g is an oil return groove provided on the outer peripheral surface of at least one motor mounting leg 7d. , communicates with the recess 705 on the upper part of the second frame 7. Also, the outer diameter of the second frame 7 is Ciel 901.
3. Outer peripheral surface 70 for fixing by shrink fitting, press fitting, etc.
0 is formed to be somewhat larger than the outer diameter of the first frame 7, and like the first frame 6, a plurality of gas passages 614b extending in the axial direction are provided at predetermined intervals on the outer periphery. There is. 76a is the second
This is a spigot part provided on the upper surface side of the frame 7. Further, 702 is a second main bearing fixed to the second frame 7 by press fitting or the like, and is machined concentrically with the spigot part 76a. The first frame 6 and second frame 7 have spigot parts 67a and 76, respectively.
a are configured so that they fit into each other with almost no gap, and therefore, when the compressor is assembled, the concentricity of the first main bearing 602 and the second main bearing 702 is ensured, and both bearings 602 , 702, the main shaft 4 is rotatably supported. A first balancer 402 projects from the main shaft 4 so as to be accommodated in a balancer chamber 705 that is a recess formed on the upper surface of the second frame 7 . In this embodiment, the first balancer 402 is molded integrally with the main shaft 4, but it is also possible to attach the first balancer 402, which is molded separately from the main shaft 4, to the main shaft 4 by bolts, shrink fitting, etc. good. Reference numeral 11 denotes a motor stator, which is fastened to the lower end of the motor mounting leg 7d by bolts 704. 1
0 is a motor rotor, which is fixed to the main shaft 4 by press-fitting, shrink-fitting, or the like. Furthermore, a second balancer 403 is provided at the lower end of the motor rotor 10. 106 is fixed scroll 1, first
This is a bolt that tightens and fixes the frame 6 and the second frame 7 together.

The assembly of the main parts of such a scroll compressor will be further explained with reference to FIG. FIG. 5 is an exploded perspective view showing the assembled state of the main parts such as the fixed scroll 1, the swinging scroll 2, the Oldham joint 8, the first frame 6, the second frame 7, the main shaft 4, and the motor stator 11 in FIG. be. Fifth
In the figure, reference numeral 111 denotes a pair of pin holes provided on the outer circumference of the fixed scroll 1, and the spiral side plate 102 of the fixed scroll 1 is provided with a pair of pin holes 111.
Processed based on. In other words, the pairs of pin holes 111 are located at 180 degrees opposite each other with respect to the center of the side plate 102. Further, reference numeral 613 designates a pair of pin holes provided on the outer periphery of the first frame 6, which are bored at positions completely symmetrical to the center of the first main bearing 602. That is, the pin holes 613 of each pair are located at 180 degrees opposite each other with respect to the center of the first main bearing 602. Also, the pin hole 61 of the first frame 6
The pitch of 3 is the pin hole 11 of the fixed scroll.
It perfectly matches the pitch of 1. Further, 27 is an assembly pin.

The scroll compressor constructed as described above is assembled as follows. First, the main shaft 4 is inserted into the second frame 7 from above, and then the main shaft 4 is used as a guide, and the spigot part 67a of the first frame 6 is fitted into the spigot part 76a of the second frame 7. and second main bearing 702
The first frame 6 is set so that the two are concentric. The Oldham joint 8 is attached to the first frame 6 so that its pawl 802 loosely fits into the Oldham groove 607 of the first frame 6.
Installed on frame 6, then swinging scroll 2
, the shaft 204 is fitted into the eccentric bush 5 attached to the main shaft 4, and the first
It is mounted on the thrust main shaft 601. Next, by setting the two pins 27 so as to pass through the pin holes 111 of the fixed scroll 1 and the pin holes 613 of the first frame 6, the fixed scroll 1 is attached to the upper end surface of the first frame 6 in its spiral shape. Side plate 102
The center of the first main bearing 602 is aligned with the center of the first main bearing 602. After that, by bolt 106,
If the fixed scroll 1, the first frame 6, and the second frame 7 are fastened together, the fixed scroll 1, the oscillating scroll 2, the Oldham joint 8, the first frame 6, the second frame 7, and the main shaft 4, which form a compression element, The assembly is completed. Note that the pin 27 does not necessarily have to be used. After that, the motor stator 11 is attached to the motor mounting foot 7d of the second frame 7 with bolts 704, and the motor rotor 10 is attached to the main shaft 4 by shrink fitting, etc., and then the outer peripheral part of the second frame 7 is shrink fit etc. to the lower shell 9013. The entire assembly is completed by fixing with the upper shell 902 and sealing with the upper shell 902.

[Problem that the invention seeks to solve]

Since the conventional scroll compressor is configured as described above, when the outer surface 700 of the second frame 7 is shrink-fitted to the lower shell 9013, the axial length of the outer surface 700 as shown in FIG. Shrink fitting force F ₁ acts on half position L/2 which is the center of L,
When L/2l (l: the length of the spigot part 76a in the axial direction), if l-L/2=r, a moment of M=F ₁ r acts on the spigot part 76a, and the recess 705
Shrink fitting force F ₁ acts on the side and it tends to fall down. Therefore, from the spigot part 76a to the spigot part 67a.
Force _F2 is transmitted to the spigot part 67a, and the lower side of the spigot part 67a is tightened. As a result, the first frame 6 is
It deforms into a mountain shape as shown in the figure. In addition, in FIG. 6, the illustration is exaggerated for ease of explanation.

When the first frame 6 deforms, the thrust bearing 6
01 is also deformed into a mountain shape, and the thrust bearing 601 and the base plate 201 of the oscillating scroll 2 slide with local uneven contact on the inner circumferential side as shown in FIG. 6, resulting in wear of the bearing. There was a problem with burn-in.

This invention was made to solve the above problems, and eliminates the deformation of the first frame.
The objective is to obtain a scroll compressor that prevents wear and seizure of bearings.

[Means for solving problems]

In the scroll compressor according to the present invention, a relief part is formed on the outer circumferential surface of the spigot part of the second frame, the diameter of which is smaller than the shrink-fitting outer surface, so that the shrink-fitting force does not act on the shell and does not contact the shell. .

[Effect]

In this invention, since there is a relief part on the outer surface of the shrink-fitted second frame corresponding to the spigot part of the first frame to be fitted to the second frame, the second frame has a relief part.
When the frame is shrink-fitted to the shell, the shrink-fitting force no longer acts on the spigot part of the first frame,
This prevents deformation of the first frame and eliminates uneven contact of the thrust bearing.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.
The diagram will be explained.

In FIG. 1, the same symbols as in FIGS. 4 and 5 indicate corresponding parts. In this example,
Second frame 7 shrink-fitted to lower shell 9013
The lower shell 9013 is located above the outer surface 700 and has a smaller diameter than the outer surface 700 by cutting the outer periphery of the first frame 6 on the spigot part 67a side.
A relief portion 701 is formed which is not in contact with the
The relationship A+L/2≧l holds between the axial length L of the second frame 7 and the depth l of the recess 705 of the second frame 7. That is, the sum of the length A of the relief part 701 and half L/2 of the length in the axial direction of the outer surface 700 is set to be equal to or larger than the depth l of the recessed part 705. The axial center of the outer surface 700 of the second frame 7 is at least the spigot part 6 of the first frame 6.
7a is positioned away from the outer peripheral surface of the recess 705 to which it fits.

As described above, the shrink-fitted outer surface 7 of the second frame 7
Since the relief part 701 is formed at the fitting end side of the lower shell 9013 of 00, and A+L/2≧l, when the second frame 7 is shrink-fitted to the lower shell 9013, the spigot part 76a has a relief part 701. A moment that tends to deform toward the recess 705 is not generated, and the shrink fitting force F ₁ is balanced at a portion corresponding to the outer surface 700 other than the recess 705 . As a result, no force is transmitted from the spigot part 76a to the spigot part 67a, and no deformation occurs in the first frame 6 as shown in FIG. Therefore, the thrust bearing 601 and the base plate 201 of the swinging scroll 2 are
As shown in the figure, proper abutment allows sliding without uneven contact, and uneven wear and seizure of the bearing can be prevented.

〔Effect of the invention〕

As described above, according to the present invention, a relief part that does not contact the shell is formed on the outer peripheral surface of the spigot part of the second frame, and the spigot part of the first frame Since it is positioned away from the outer surface of the recess of the second frame to which it is to be fitted, when the second frame is shrink-fitted to the shell, the second frame deforms inward at the recess due to the shrink-fitting force. As a result,
This has the effect of preventing the first frame from being deformed and the thrust bearing from being distorted and coming into partial contact with the rocking scroll base plate, as well as preventing abnormal wear and seizing of the thrust bearing.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of essential parts showing an example of a scroll compressor according to the present invention, Fig. 2 is an explanatory sectional view of the invention, and Figs. , FIG. 4 is a sectional view of a conventional scroll compressor, FIG. 5 is an exploded perspective view of essential parts of the conventional scroll compressor, and FIG. 6 is an explanatory sectional view of the conventional scroll compressor. DESCRIPTION OF SYMBOLS 1... Fixed scroll, 2... Oscillating scroll, 201... Oscillating scroll base plate, 4... Main shaft, 6... First frame, 601... Thrust bearing, 67a, 76a... Pit part, 7... …Second
Frame, 700...Shrink-fitting outer surface, 701...
Relief part, 705... recessed part, 9013... lower shell. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A fixed scroll housed in the shell, an oscillating scroll that is housed in the shell and controls the volume of fluid by cooperating with the fixed scroll through oscillating motion, a main shaft that drives the oscillating scroll, and a main shaft that drives the oscillating scroll; a first frame that is housed in a frame and supports the oscillating scroll on one end surface via a thrust bearing, holds the fixed scroll and is rotatably supported on the upper end of the main shaft;
The lower surface of the frame has a recess that fits into a spigot formed concentrically with the support part, and a spigot that is concentric with the recess, and is rotatably supported on the lower side of the main shaft. In a scroll compressor comprising a second frame having an outer surface that is shrink-fitted into the shell, a relief portion having a diameter smaller than the shrink-fitted outer circumferential surface is formed on the outer circumferential surface of the spigot part of the second frame; A scroll compressor characterized in that the axial center of the shrink-fitted outer circumferential surface is located away from the outer circumferential surface of the recess of the second frame into which the spigot part of the first frame is fitted.