JPH0555718B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a scroll-type fluid machine, and particularly to a structure for reducing power loss caused by compressing oil during the orbiting movement of the outer periphery of the end plate of an orbiting scroll. It is.

[Prior Art] A hermetic scroll compressor will be described as an example of a scroll fluid machine. The structure of the conventional hermetic scroll compressor, which is particularly compact, is the first.
As shown in the figure, an orbiting scroll 1 and a fixed scroll 2 that perform relative orbiting motion, a crankshaft 3,
It consists of a scroll-type compression mechanism consisting of a frame 4, a motor 5 that drives this, and an airtight container 6 that houses this. The orbiting scroll has a spiral wrap 1b on an end plate 1a, and has on its back a rotation prevention mechanism 1c for preventing rotation, and a rotation bearing 1d into which the crank portion of the crankshaft 3 is inserted.
The fixed scroll 2 also has a spiral wrap 2b on the end plate 2a. The fixed scroll 2 is also provided with an inlet 2c and an outlet 2d. The fixed scroll 2 and the orbiting scroll 1 are assembled with each other with their laps facing inward. The frame 4 is provided with a notch 4a having a space in which the end plate 1a of the orbiting scroll can perform an orbiting motion. mirror plate 1a
It has a notch upper surface 4e that holds the rotary scroll 1, and a notch inner circumferential surface 4f that is very close to the orbiting motion envelope circle of the orbiting scroll 1. In this way, the notch upper surface 4e
The fact that there is a minute gap between the end plate 1a and the lower surface of the end plate 1a, and that the inner peripheral surface 4f of the notch and the outer circumference of the orbiting motion envelope of the orbiting scroll 1 are made extremely close to each other, reduces the overall height of the hermetic scroll compressor. This will help reduce the size of the compressor, since the outer diameter will be reduced. Then, the end plate 1a of the orbiting scroll is housed in this notch 4a, and the frame 4 and the fixed scroll 2 are fastened together, and the orbiting scroll 1
to hold. A back pressure chamber 4b is formed on the back surface of the orbiting scroll 1 by a frame 4. Back pressure chamber 4b
is communicated with a compression chamber formed by the laps and end plates of the orbiting scroll 1 and the fixed scroll 2 through pressure equalization holes (not shown) provided in the end plate 1a of the orbiting scroll. The frame 4 is further provided with a bearing 4c that supports the crankshaft 3 and a pedestal 4d that supports the motor 5. An oil supply hole 3a is provided inside the crankshaft 3, and an airtight container 6
The oil in the lower part is supplied to the swing bearing 1d and the bearing 4c.
Due to the rotation of the motor 5, the crankshaft 3 and the anti-rotation mechanism 1c perform a relative rotation movement, and the space (compression chamber) formed by the wrap of both scrolls and the end plate moves to the center, thus reducing its volume. Decrease. As a result, the gas inhaled from the suction port 2c is compressed and discharged from the discharge port 2d. The gas discharged from the discharge port 2d passes through the closed container 6 and is discharged from a discharge pipe (not shown). When the scroll performs a compression action, a force acts that tends to separate both scrolls. Therefore, in order to prevent the scroll from separating, the pressure in the back pressure chamber 4b on the back surface of the orbiting scroll 1 is set to an intermediate pressure higher than the suction pressure and lower than the discharge pressure, and the orbiting scroll 1 is pressed against the fixed scroll 2. Oil supplied from the oil supply hole 3a of the crankshaft 3 to the swing bearing 1d and the bearing 4c flows to the back pressure chamber 4b where the pressure is low. The oil flowing into the back pressure chamber 4b is discharged from the pressure equalizing hole provided in the end plate 1a of the orbiting scroll to the compression chamber, but when the amount of oil supplied to the bearing exceeds the discharge capacity, oil accumulates in the back pressure chamber 4b. The oil enters the notch 4a of the frame 4 by being stirred by the balance weight 4g, and enters the space approximately at the same height as the thickness of the end plate 1a formed by the notch inner circumferential surface 4f and the outer circumferential surface of the end plate 1a of the scroll 1. Filled with oil. In this case, the oil in the space on the front and rear sides in the rotation direction takes the shape of a wedge based on the point where the outer peripheral surface of the end plate 1a of the orbiting scroll 1 is very close to the inner peripheral surface 4f of the notch, and the orbiting movement of the orbiting scroll 1 As a result, the wedge-shaped oil on the front side in the turning direction is compressed on the outer circumferential surface of the head plate 1a, but since oil is incompressible and has viscous resistance, this oil compression causes significant power loss. result.

[Object of the Invention] In view of the above-mentioned points, an object of the present invention is to provide a scroll fluid machine provided with an oil release means for preventing oil compression on the outer peripheral portion of the end plate of an orbiting scroll.

[Structure of the Invention] In order to achieve the above object, a scroll fluid machine according to the present invention includes a compressor section that combines a fixed scroll and an orbiting scroll each having a spiral wrap on each end plate, and an orbiting scroll that is driven to orbit. A notch that has a notch upper surface that holds the end plate of the orbiting scroll while maintaining a minute gap between the electric motor part and the bottom surface of the end plate of the fixed scroll, and a notch inner peripheral surface that is very close to the orbiting motion envelope circle of the orbiting scroll. The frame part that supports the orbiting scroll inside is housed in a sealed container, and the discharge port of the compressor part is opened into the sealed container to maintain the inside of the container at a high pressure. In a scroll fluid machine configured to supply oil to an orbiting bearing provided on the back surface of an orbiting scroll end plate, a rotation for releasing oil in the notch from the front side to the rear side in the orbiting direction of the orbiting scroll during the orbiting movement of the orbiting scroll. It is characterized by providing an oil release means that extends continuously or partially intermittently over the entire outer circumference of the scroll.

The present invention prevents oil compression by allowing the oil on the outer periphery of the end plate of the orbiting scroll to easily move from the front side in the rotation direction to the rear side and further to the back pressure chamber using an oil relief means within a notch in the frame. The focus is on reducing power loss.

[Embodiments of the Invention] Examples will be described with reference to FIGS. 2 to 10. Note that the overall structure and operation of the compressor are the same as those of the conventional compressor, so a description thereof will be omitted. Figures 2 and 3 show the end plate 1a of the orbiting scroll 1 in the notch 4a of the frame.
This is an example of a structure in which an annular groove 7a continuous in the circumferential direction is provided on a notch upper surface 4e near the notch inner circumferential surface 4f of the frame notch 4a facing the back surface of the frame notch 4a. As shown in FIG. 3, even when the outer peripheral surface of the end plate 1a of the orbiting scroll is close to the notch inner peripheral surface 4f of the frame 4, oil can move from the front side to the rear side in the orbiting direction of the orbiting scroll through the groove 7a. Oil compression can be prevented. This circumferential groove may be provided as an intermittent groove 7b as shown in FIGS. 4 and 5.

In this method, as shown in FIG. 6, the same effect can be obtained even if a cutout 9 is provided over the entire circumference of the end plate 1a of the orbiting scroll 1 on the outer periphery on the back side.

7 and 8 show the notch 4a of the frame 4.
This is an example of a structure in which, in addition to the groove 7a, a plurality of radial grooves 10 communicating from the groove 7a to the back pressure chamber 4b are provided on the surface of the orbiting scroll facing the end plate 1a.
As shown in FIG. 8, the end plate 1a of the orbiting scroll
When the oil approaches the frame 4, the oil flows into the groove 7a and the groove 1.
0 to the back pressure chamber 4b, oil compression can be prevented.

[Effects of the Invention] Since the present invention is constructed as described above, it is possible to prevent oil compression on the outer peripheral portion of the orbiting scroll head plate and reduce power loss.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing the structure of a conventional scroll compressor, Figs. 2 to 10 show an embodiment of the present invention, Fig. 2 is a top view of the frame, and Fig. 3 is A of Fig. 2. -A cross-sectional view taken along line A, Figure 4 is a top view of the frame, Figure 5 is a cross-sectional view taken along line B-B in Figure 4, and Figure 6 is an embodiment in which a cutout is provided on the lower surface of the orbiting scroll end plate. 7 is a top view of a frame of an embodiment in which radial grooves are added to FIG. 2, and FIG. 8 is a sectional view taken along line C--C in FIG. 7. 1... Orbiting scroll, 1a... End plate, 1b... Wrap, 1c... Rotation prevention mechanism, 1d... Orbiting bearing, 2...
Fixed scroll, 2a... End plate, 2b... Wrap, 2
c...Suction port, 2d...Discharge port, 3...Crankshaft, 3
a...Oil supply hole, 4...Frame, 4a...Notch, 4b
... Back pressure chamber, 4c... Bearing, 4d... Pillar, 4e... Notch top surface, 4f... Notch inner peripheral surface, 5... Motor, 6...
Airtight container, 7a, 7b...Circumferential grooves provided in the frame, 9...Removed portions extending over the entire circumference provided in the end plate of the orbiting scroll, 10...Radial grooves.

Claims (1)

[Scope of Claims] 1. A compressor section that combines a fixed scroll and an orbiting scroll each having a spiral wrap on its end plate, an electric motor section that drives the orbiting scroll to revolve, and a microscopic part between the lower surface of the end plate of the fixed scroll. 〓 A frame part that supports the orbiting scroll in a notch having an upper surface of the notch that holds the end plate of the orbiting scroll with a gap therebetween and an inner circumferential surface of the notch that is very close to the envelope circle of the orbiting motion of the orbiting scroll, and a frame portion that supports the orbiting scroll in a sealed container. At the same time, the discharge port of the compressor section is opened into the closed container to maintain the inside of the container at a high pressure, and the high pressure is used to supply oil to the orbiting bearing provided on the back of the orbiting scroll end plate. In the scroll fluid machine constructed as described above, during the orbiting movement of the orbiting scroll, the oil in the notch is continuously or partially intermittent throughout the entire outer circumference of the orbiting scroll in order to release the oil from the front side to the rear side in the orbiting direction of the orbiting scroll. A scroll fluid machine characterized by being provided with an extending oil relief means. 2. The scroll fluid according to claim 1, wherein the oil release means is an annular groove that extends continuously or intermittently in the circumferential direction provided on the upper surface of the frame notch near the inner peripheral surface. machine. 3. The scroll fluid machine according to claim 2, wherein the annular groove communicates with the back pressure chamber through a plurality of radial grooves provided on the upper surface of the frame cutout. 4. The scroll fluid machine according to claim 1, wherein the oil escaping means is a cutout extending over the entire circumference of the outer circumferential portion of the back side of the orbiting scroll end plate.