JP3495216B2 - Scroll compressor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor, and more particularly, to an improvement of an orbiting scroll rotation preventing mechanism for a scroll compressor suitable as a refrigerant compressor for refrigeration and air conditioning, and as an air or other gas compressor. .

[0002]

2. Description of the Related Art The principle of compression action of a scroll compressor and the structure and operating principle of an Oldham joint are disclosed in Japanese Patent Laid-Open No. 60-882.
26 and JP-A-58-174101. Also, an Oldham joint in which a key-like protrusion is formed on the plane of the separation portion of two linear grooves is disclosed in JP-A-63-2279.
No. 81 publication.

[0003]

Problems to be Solved by the Invention JP-A-63-2279
In the Oldham joint described in Japanese Patent Publication No. 81, in which a key-shaped protrusion that engages with the key groove of the frame pedestal is formed in the plane of the space between the two linear grooves, the sliding portion with the frame is the key-shaped portion. It is the bottom surface of the linear groove that forms the side surface of the protrusion and the key-shaped protrusion, and there is no sliding surface with the frame on the line orthogonal to the key-shaped protrusion that engages with the key groove of the frame pedestal.
When the orbiting scroll base plate fluctuates in the vertical direction while the compressor is operating and the force that tilts the Oldham joint is applied, the tilt that occurs in the combination gap of the key groove of the frame base and the keyed protrusion of the Oldham joint cannot be supported. It was As a result, the key-like protrusion makes a line contact with the key groove, which causes wear and galling on the key-like protrusion and the key groove. Further, it is conceivable that a position on the line orthogonal to the key-shaped projection engaging with the key groove of the frame pedestal is a sliding surface with the frame, but the sliding surface has a height different from that of the bottom surface of the linear groove. In this case, since it is difficult to process at the same time, it is difficult to manufacture so that both the sliding surface and the bottom surface of the linear groove are received by the frame pedestal without a gap. There was a problem to do.

On the other hand, in the Oldham joint described in JP-A-58-174101 in which the key-like projection is formed without providing the linear groove as described in JP-A-63-227981, the key groove of the frame pedestal is disclosed. It is easy to provide a sliding surface with a plurality of frame pedestals on both sides of the key-like projection that engages with and on the line orthogonal to the key-like projection by aligning the heights of the planes. Moreover, even if the overall thickness and diameter are made equal to those of the Oldham joint described in JP-A-63-227981, there is a problem that equivalent rigidity cannot be obtained.

The present invention solves the above problems,
An object of the present invention is to provide a scroll compressor that prevents the tilt of the Oldham coupling that causes wear of the key-like protrusions and secures the rigidity of the Oldham coupling.

[0006]

In order to achieve the above object, a scroll compressor according to the invention of the present application comprises a fixed scroll and an orbiting scroll in which a spiral wrap is erected on a base plate by meshing the wraps with each other. Hold it on the frame, engage the back of the orbiting scroll base plate with the crankshaft,
An Oldham joint for preventing rotation of the orbiting scroll is provided between the back surface of the base plate and the pedestal of the frame, and the Oldham joint has a key-like projection axially protruding from one side of the annular member on the back surface of the base plate of the orbiting scroll. Two linear grooves that engage with the provided key groove and that are parallel to the direction orthogonal to the above-mentioned projection are provided on the back surface of the annular member, and the key-like projection formed on the plane of the separation portion of both grooves is formed on the frame. In a scroll compressor that engages with a key groove provided on a pedestal, the bottom surface of the linear groove that forms the key-like projection of the Oldham coupling is used as a first sliding surface with the frame, and the frame is flush with the frame. Is provided with a second sliding surface.

The second with the frame of the Oldham coupling
The sliding surface may be provided on a line that is orthogonal to the center line of the key-like protrusion that engages with the key groove provided on the pedestal of the frame.

The annular member of the Oldham coupling may be provided with an L-shaped notch to form the second sliding surface with the frame.

The L-shaped notch may be provided in a range that does not intersect the line of 45 degrees from the center line of the key-like protrusion.

The second sliding surface with the frame may be formed by providing a concave groove in the annular member of the Oldham coupling.

From the center line of the key-like protrusion, the concave groove is formed 4
You may provide in the range which does not cross a 5 degree line.

A second sliding surface with the frame may be formed by providing a collar on the annular member of the Oldham coupling.

The Oldham coupling may be formed of non-ferrous metal, resin, or a composite material of metal and resin.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the scroll compressor of the present invention will be described below.

FIG. 1 is a sectional view of a scroll compressor.
Inside the closed container 7, an upper compressor section and a lower electric motor section 6
An electric scroll compressor, which is connected via a rotary shaft 3, is provided. The compressor section includes a fixed scroll 1 in which a spiral wrap 102 is erected on a base plate 101, and a base plate 201.
Orbiting scroll 2 with a spiral wrap 202 upright
And the wraps are engaged with each other to form a compression mechanism portion, and the fixed scroll 1 has a suction port 103 and a discharge port 104.
Is provided.

The rotating shaft 3 is a bearing 401 of the frame 4.
And 402, and a crank pin 301 at the tip.
The crank pin 301 is inserted into a boss 203 projecting below the base plate 201 of the orbiting scroll 2 to connect the crank pin 301 and the orbiting scroll 2.
The Oldham's joint 5 is arranged between the back surface of the base plate 201 of the orbiting scroll 2 and the bases 403 and 404 of the frame 4. The Oldham's joint 5 is a joint as a rotation preventing mechanism that causes the orbiting scroll 2 to orbit with respect to the fixed scroll 1 without rotating.

In the compressor section, when the crankpin 301 is eccentrically rotated by the rotation of the rotary shaft 3 connected to the electric motor section 6, the orbiting scroll 2 does not rotate relative to the fixed scroll 1 by the rotation preventing mechanism of the Oldham coupling 5. A swirling motion is performed, and the gas is sucked into the sealed chamber formed by the scroll wraps 102 and 202 through the suction pipe 701 and the suction port 103. Due to the swirling motion, the closed chamber moves to the central portion to reduce the volume and compress the gas, and the compressed gas is discharged from the discharge port 104 to the discharge chamber. The gas discharged into the discharge chamber circulates around the compressor unit and the electric motor unit, and then is discharged from the discharge pipe 702 to the outside of the compressor.

The rotation preventing mechanism by the Oldham coupling 5 will be described in detail below.

FIG. 2 shows a side view of the Oldham coupling of this embodiment, and FIG. 3 shows a bottom view thereof. Oldham coupling 5 is an annular member 5.
01 is provided with a key-like protrusion 502, and a lower face is provided with two linear grooves 503 in a direction orthogonal to the upper-face key-like protrusions 502. The protrusion 504 is formed. Further, a notch 505 having an L-shaped cross section is provided on the back surface of the key-like protrusion 502. The side surface of the cutout can be appropriately inclined with respect to the surface to be mounted on the second 404 to be described later, instead of being at a right angle as shown in the drawing, to facilitate machining. Groove 5
03 and the L-shaped notch 505 have the same depth (same plane) with respect to the lower surface of the annular member 501 by simultaneous machining using a machine tool such as an end machine.

FIG. 4 shows the rear surface of the orbiting scroll. A linear key groove 204 is provided on the back surface of the orbiting scroll 2.

FIG. 5 shows a top view of the frame. The frame 4 is provided with a first pedestal 403.
A linear key groove 405 is provided in the center of the. Further, the second pedestal 404 is provided in the direction orthogonal to the key groove 405. The pedestal 403 and the pedestal 404 have the same height (same plane) by simultaneous processing.

The rotation preventing mechanism is the Oldham coupling shown in FIGS. 2 and 3, the linear key groove 204 provided on the back surface of the orbiting scroll 2 shown in FIG. 4, and the frame 4 shown in FIG.
Is formed by a linear key groove 405. The key-shaped projection 502 of the Oldham coupling 5 engages with the key groove 204 of the orbiting scroll 2 and slides. Also, the key-like protrusions 50 on the lower surface
Reference numeral 4 engages with the key groove 405 of the frame 4 and slides. Groove 5
The bottom surface of 03 slides on the first pedestal 403 of the frame 4,
Further, the bottom surface of the L-shaped notch 505 is the second portion of the frame 4.
Slides on the pedestal 404.

FIG. 6 shows the key-shaped projection 504 of the Oldham coupling 5.
3 shows the dimensional relationship between the key groove 405 of the frame 4 and. Between the key-like protrusion 504 and the key groove 405, there is a minute gap δ necessary for assembly and operation.

Here, FIG. 7 shows an example of the state of the Oldham coupling in operation in the conventional example, and the conventional problems will be described. When the orbiting scroll moves up and down during operation, a moment M acts on the Oldham joint. At this time, in the conventional example, the Oldham's joint tilts with the end point P of the pedestal 403 as a fulcrum within the range of the minute gap δ as shown in FIG. There was a drawback that galling was likely to occur.

FIG. 8 shows a state during operation of the Oldham coupling of the present invention. In the present invention, since the bottom surface of the notch 505 is in contact with and slides on the pedestal 404 of the frame, it is possible to prevent the inclination even when the moment M acts. In another conventional example shown in FIG. 11, the inclination due to the moment can be prevented without providing the notch as in the present embodiment, but the embodiment of the present invention shown in FIG. Example and Figure 11
Comparing these conventional examples, the Oldham coupling of the present invention is superior in strength because the annular member 501 is thicker. Therefore,
The present invention can solve the problems of both the tilt and the rigidity of the Oldham's joint.

FIG. 9 shows a second embodiment of the present invention. This embodiment is an example in which a concave groove 506 is provided at the same depth as the bottom surface of the groove 503 instead of the notch, and the function and effect are similar to those of the notch. The center line of the groove 506 is orthogonal to the center line of the key 504.

FIG. 10 shows a third embodiment of the present invention. In the present embodiment, a flange 507 is provided on the side surface of the annular member instead of the notch, and a sliding surface having the same depth as the bottom surface of the groove 503 is formed. Also in this embodiment, the function and effect are the same as those of the cutout.

In order to prevent the orbiting scroll from rotating, the Oldham coupling produces a force F as shown in FIG. 3 on the key-shaped projections 502 and 504, and a bending moment is generated on the annular member 501, so that the key-shaped projections. On the other hand, the stress increases in the annular member in the direction of 45 degrees, but in the embodiment of FIG. 3, high rigidity is secured by providing the notches 505 so that they do not intersect the line of 45 degrees with respect to the key-like protrusion 504. There is. Also in FIG. 9, the same effect is obtained by providing the concave groove so as not to intersect with the key-shaped projection 504 on the line of 45 degrees.

The Oldham's joint in the above embodiment may be a non-ferrous metal such as aluminum, a resin such as engineering plastic, or a composite material obtained by coating or impregnating non-ferrous metal with a resin such as Teflon.

[0030]

According to the present invention, the bottom surface of the linear groove forming the key-shaped projection of the Oldham coupling is used as the first sliding surface with the frame, and the second sliding surface with the frame is flush with the frame. Since the moving surface is formed, it is possible to prevent wear, galling, and contact noise of the key-shaped projections and key grooves caused by tilting of the Oldham joint, and at the same time, the rigidity of the Oldham joint can be secured without increasing the size. It is possible to provide a compact and highly reliable scroll compressor.

[Brief description of drawings]

FIG. 1 is a sectional view of a scroll compressor according to a first embodiment of the present invention.

FIG. 2 is a side view of the Oldham coupling according to the first embodiment of the present invention.

FIG. 3 is a bottom view of the Oldham coupling according to the first embodiment of the present invention.

FIG. 4 is a rear view of the orbiting scroll according to the first embodiment of the present invention.

FIG. 5 is a top view of the frame according to the first embodiment of the present invention.

FIG. 6 is a diagram showing the dimensional relationship between the key-like protrusions of the Oldham coupling and the key grooves of the frame according to the first embodiment of the present invention.

FIG. 7 is a first example of the prior art and is a diagram showing a state of an Oldham coupling during operation.

FIG. 8 is a diagram showing a state of the Oldham coupling during operation according to the first embodiment of the present invention.

FIG. 9 is a bottom view of the Oldham coupling according to the second embodiment of the present invention.

FIG. 10 is a bottom view of the Oldham coupling according to the third embodiment of the present invention.

FIG. 11 is a second example of the prior art and is a side view of an Oldham coupling.

[Explanation of symbols]

1: fixed scroll, 101: base plate, 102: wrap,
103: suction port, 104: discharge port 2: orbiting scroll,
201: base plate, 202: wrap, 203: boss, 20
4: key groove 3: rotating shaft, 301: crank pin 4: frame, 401: bearing, 402: bearing, 403:
Pedestal, 404: Pedestal, 405: Key groove 5: Oldham coupling, 501: Annular member, 502: Key-shaped projection, 503: Groove, 504: Key-shaped projection, 505: Notch, 506: Recessed groove, 507: Tsuba 6: Electric motor part 7: Airtight container, 701: Suction pipe, 702: Discharge pipe

Continuation of front page (56) References JP-A-58-174101 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F04C 18/02 311

Claims (8)

(57) [Claims] 1. A fixed scroll and an orbiting scroll in which a spiral wrap is erected upright on a base plate are held in a frame by engaging the wraps with each other, and the back face of the base plate of the orbiting scroll is engaged with a crankshaft. An Oldham joint is provided between the rear surface and the pedestal of the frame to prevent rotation of the orbiting scroll. The Oldham joint is a key provided with a key-like projection axially protruding from one side of an annular member on the back surface of the base plate of the orbiting scroll. Two linear grooves that engage with the groove and that are parallel to the direction orthogonal to the projection are provided on the back surface of the annular member, and a key-like projection formed by the plane of the separation portion of both grooves is provided on the pedestal of the frame. In the scroll compressor engaged with the key groove, the bottom surface of the linear groove forming the key-like projection of the Oldham coupling is used as a first sliding surface with the frame, and is flush with the frame on the second surface. of A scroll compressor having a sliding surface. 2. The scroll compressor according to claim 1, wherein
A scroll compressor characterized in that a second sliding surface of the Oldham coupling with respect to the frame is provided on a line orthogonal to a center line of a key-like protrusion that engages with a key groove provided on a pedestal of the frame. 3. The scroll compressor according to claim 1, wherein
A scroll compressor characterized in that an L-shaped notch is provided in an annular member of an Oldham coupling to form a second sliding surface with the frame. 4. The scroll compressor according to claim 3,
A scroll compressor characterized in that an L-shaped notch is provided in a range that does not intersect a line of 45 degrees from the center line of the key-shaped projection. 5. The scroll compressor according to claim 1, wherein
A scroll compressor characterized in that a second sliding surface with respect to the frame is formed by providing a concave groove in the annular member of the Oldham coupling. 6. The scroll compressor according to claim 5,
A scroll compressor characterized in that a concave groove is provided in a range that does not intersect a line of 45 degrees from the center line of the key-like protrusion. 7. The scroll compressor according to claim 1, wherein
A scroll compressor characterized in that a second sliding surface with the frame is formed by providing a collar on an annular member of the Oldham's joint. 8. The scroll compressor according to claim 1, wherein
A scroll compressor whose Oldham coupling is made of non-ferrous metal, resin, or a composite material of metal and resin.