JPH0749027Y2 - Scroll fluid machinery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial application field" The present invention relates to a scroll fluid machine for compressing, expanding, and pumping a fluid, and particularly to a suction port (when applied to a compressor, on a peripheral wall of a fixed scroll). ) Or a discharge fluid (when applied to an expander) the scroll fluid machine.

“Prior Art” Conventionally, a fixed scroll in which a first wrap 13 is formed in a concave space 12 as shown in, for example, FIGS.
10 and a second wrap 21 that can be fitted to the first wrap 13.
Composed of an orbiting scroll 20 having, and by revolving the orbiting scroll 20 with respect to the fixed scroll 10 without rotating, the volume of the sealed space 22 formed between the laps 13 and 21 is variable. Scroll fluid machines are well known, and when this type of device is applied as, for example, a compressor, a peripheral wall facing the concave space 12 of the fixed scroll 10 and a second wrap 21 located in the central region of the concave space are provided. A port 16 and a discharge port 17 that are suction ports are provided on the sliding bottom surface, and the contact point (or the closest contact point) between both wraps that forms the closed space 22 that functions as a compression chamber gradually moves toward the center. As described above, when the orbiting scroll 20 is revolved around the center of the wrap 2 of the fixed scroll 10 with a constant radius, the gas taken in through the suction port 16 and the second wall and the peripheral wall surface of the concave space 12 are absorbed. While swirling around the winding end end 21b (outer end) of the second lap 21 through a narrow passage with the outer peripheral surface of the lap 21, it is taken into the closed space 22 formed by both laps 13 and 21, and turns. The scroll 20 moves toward the center while gradually reducing its volume along with the revolution movement of the scroll 20. Then, this fluid has a high pressure and is discharged from the discharge port 17 to the outside when the closed space 22 is electrically connected to the discharge port 17.

Now, in such a conventional technique, the wrap 21 of the orbiting scroll 20 has the winding end end 21b of the wrap 13 of the fixed scroll 10.
The fluid is taken into the closed space 22 when it is separated from the outer side surface of the fixed scroll 10, and the outer peripheral surface of the winding end end 21b of the wrap 21 of the orbiting scroll 20 is the concave space 1 of the fixed scroll 10.
2, the distance between the two faces is narrowed due to the proximity to the peripheral wall, and as a result, the gas passage becomes narrower and the suction resistance increases.As the temperature rises, its suction efficiency, in other words, the volume of the compressor. The problem of reduced efficiency arises.

In order to eliminate such a defect, a recess 19 is provided on the sliding surface of the concave space 12 on the fixed scroll 10 side, which faces the wrap winding end 21b of the orbiting scroll 20. A scroll fluid machine has been proposed in which the outer peripheral side and the inner peripheral side of the wrap 21 of the orbiting scroll 20 can communicate with each other (Japanese Patent Publication No. 63-15442).

[Problems to be solved by the invention] In this type of device, it is necessary to form the recess 19 to be wide in the radial direction in order to avoid an increase in suction resistance. Edge 21b
Is located. Fixed scroll 10 side wall and first wrap
The recess 19 is recessed almost in the widthwise direction of the area sandwiched between the 13, and as a result, as shown in FIG. 2B, the inner peripheral surface of the wrap winding end 21b is the first. When a closed space 22 is formed by making contact with the outer peripheral surface of the wrap 13, a part of the bottom surface of the wrap winding end 21b (the portion that contacts the sliding surface 14 on the fixed scroll 10 side) is the recess.
It was put on the inside of 19, and the recess 19 and the enclosed space 22
There is a risk of electrical continuity between the two.

Further, for example, as shown in Japanese Patent Application No. 62-155618, a tip seal member 31 (see FIG. 1 (A)) is provided on the end surface of the wrap.
The so-called oil-free type, that is, a device that revolves the orbiting scroll 20 in an oil-free manner has been developed by the applicant of the present invention.However, in such a device, when the recess 19 is recessed on the sliding surface, Since the tip seal member 31 comes into contact with the edge of the recess 19, there is a problem that the tip seal member 31 is significantly worn and the durability of the tip seal member 31 is significantly reduced.

In view of the above-mentioned drawbacks of the prior art, the present invention aims to improve the smooth sealing property and durability of the tip seal member 31 in the closed space 22, and at the same time, to end the winding end of the wrap of the orbiting scroll 20.
An object of the present invention is to provide a scroll fluid mechanism that prevents an increase in suction resistance that occurs near 21b and improves volume efficiency.

[Means for Solving the Problem] In order to achieve the technical problem, the present invention is designed so that the second lap 21 slides on the sliding surface 14 of the concave space 12 as shown in FIG. 1 (A). Without providing the recesses 19 and the like directly in the guide path 18 that communicates with the port in an area off the sliding surface.
The first feature is that the point is formed.

The second characteristic is that the guide path 18 is provided with a sealing member 32.
While not reaching the portion where it is disposed, along with the inner peripheral surface side of the peripheral wall of the fixed scroll 10 located below it, the guide path 18 is substantially along the inner peripheral surface of the peripheral wall 11 of the fixed scroll 10. It is a point that is formed to extend in an arc shape.

Further, the third characteristic point is that the guide path 18 does not pass through the end face side of the second wrap 21 on the orbiting scroll 20 side, and the opening of the guide path 18 exceeds the wrap winding end end 21b. The point is that it can directly face the peripheral wall surface of the first lap 13 located inside the lever.

"Operation" According to the technical means, the guide path 18 is not formed on the sliding surface of the fixed scroll 10 in contact with the end surface of the second wrap 21, and the guide path 18 is provided in the area deviated from the sliding surface. Since it is possible to form the closed space 22 smoothly, even when the tip seal member 31 is fitted to the end surface of the wrap facing the sliding surface, the tip seal member 31 does not have the guide path 18
Since it does not come into contact with the end surface of the, the durability can be improved without causing wear.

Incidentally, the guide path 18 may be formed as a bypass or a tunnel-shaped passage, but it is preferable that the guide path 18 is formed along the inner peripheral surface of the peripheral wall 11 of the fixed scroll 10 as in the present application. As the fluid passage between the winding end end 21b peripheral surface of the wrap of the orbiting scroll 20 and the peripheral wall 11 of the fixed scroll 10 becomes wider than the bypass or tunnel-like passage, which is preferable because it is possible to completely prevent an increase in fluid resistance. Processing is also easier than in the case of forming an isolated passage.

The surface also has a guide path 18 along the inner peripheral surface of the peripheral wall 11 of the fixed scroll 10.
And that the opening of the conduit 18 can directly face the peripheral surface of the first wrap located inside the end of the second wrap beyond the winding end of the second wrap. It is preferable because it is possible to moderate a sudden direction change when flowing into the inner peripheral side while wrapping around the end end 21b.

In addition, as shown in FIG. 3, in the oil-free scroll type fluid machine in which a sealing member 32 made of a self-lubricating resin is attached on the joint surface of the peripheral wall 11 which comes into contact with the orbiting scroll 20, If the path 18 is to be opened to the joint surface, the sealing member 32 must be provided further outside thereof, resulting in a problem that the outer diameter of the fixed scroll becomes large.

For this reason, in the present application, the guide path 18 is formed along the inner peripheral surface of the peripheral wall 11 located therebelow without opening to the joint surface.

[Embodiment] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings. However, unless otherwise specified, the dimensions, materials, shapes, relative positions, etc. of the components described in this embodiment are not intended to limit the scope of the present invention thereto, but merely illustrative examples. Nothing more than.

FIG. 3 shows an oil-free scroll compressor according to an embodiment of the present invention, which comprises the fixed scroll 10, the orbiting scroll 20, and a frame 40 for fixing or rotating the fixed scroll 10 at a predetermined position as described above. To briefly describe the schematic configuration of these members, the fixed scroll 10 is fixed to the end surface of the frame 40 and has a port 16 that functions as a suction port.
A concave space 12 surrounded by a peripheral wall 11 (see FIG. 1)
While forming a spiral wrap 13 upright inside,
A discharge port 17 for discharging the compressed fluid is bored at approximately the center thereof.

The orbiting scroll 20 is housed in a recessed space in the frame 40, and a spiral wrap 21 having substantially the same shape as the wrap 13 of the fixed scroll 10 is formed upright on one surface of the end plate that abuts the peripheral wall 11. At the same time, the laps 13 and 21 are shifted by 180 ° and fitted together. In addition, each scroll 1
Cooling fins 33 and 23 are formed on the back side of 0 and 20, respectively,
The inside of the scroll can be cooled by air cooling.

Then, the wraps 13 and 21 of each scroll are groove portions 13a, which are recessed in the end surface facing the sliding surface of the other scroll, respectively.
23a is formed, and the self-lubricating chip seal member 31 is fitted into the grooves 13a and 21a so as to be slidable without lubrication with the sliding surface of the other scroll, and the outer circumference of the end plate of the orbiting scroll 20. A ring-shaped groove portion recessed in the end plate surface of the fixed scroll that abuts against the ring-shaped portion, for example, a self-lubricating sealing member 32 made of a tube-shaped ring is fitted, and by the elastic force of the tube-shaped ring itself, The airtightness with the outside of the end plate in the concave space 12 is maintained and dust is prevented from entering.

On the other hand, the frame 40 supports the main drive crankshaft 41 having a pulley 42 attached to one end thereof along the central axis, and
The driven crankshaft 43 is pivotally supported at positions (three locations) offset by 120 ° about the main drive crankshaft 41. The crankshafts 41 and 43 are both rotatably supported by the housing body 25 integrated with the orbiting scroll 20, and the orbiting scroll 20 is prevented from rotating by the drive rotation of the main drive crankshaft 41. While being fixed, the fixed scroll 10 is configured to be able to revolve around the wrap center. Since such a configuration is already known, its detailed description is omitted.

Reference numeral 30 is a suction filter attached to the port 16.

Next, referring to FIG. 1, the internal shape of the fixed scroll 10 near the portion where the port 16 is bored will be described. The port 16 functioning as a suction port is the fixed scroll 10.
While communicating with the recessed space 12 surrounded by the peripheral wall 11 from the back side, the recess is provided along the inner peripheral surface side of the peripheral wall 11 below without opening to the joint surface where the sealing member 32 is attached. Then, a conduit 18 communicating with the port 16 is formed.
The guide path 18 is an orbiting scroll that faces the inner peripheral surface of the peripheral wall 11.
It is opened beyond the winding end end 21b of the 20 wraps to a position directly facing the peripheral surface of the first wrap 13 located inside thereof.

According to this embodiment, when the orbiting scroll 20 revolves around the lap center of the fixed scroll 10 at a constant radius while being prevented from rotating by the drive rotation of the main drive crankshaft 41, the port is passed through the suction filter 30. The gas sucked into the concave space 12 from the 16 wraps around the winding end 21b of the wrap 21 while being guided to the guide path 18, and is further enclosed by the revolution of the orbiting scroll 20 between the wraps 13 and 21. It is taken in by 22 and moves toward the center while gradually reducing the volume as the orbiting scroll 20 revolves. Then, this gas has a high pressure and is discharged to the outside from the discharge port 17 when the closed space 22 is electrically connected to the discharge port 17.

According to this embodiment, by forming the guide path 18 along the inner peripheral surface of the peripheral wall 11 of the fixed scroll 10, as a result, an increase in the fluid resistance in the vicinity of the peripheral surface of the winding end 21b of the wrap of the orbiting scroll 20 is increased. This can be completely prevented, and a sudden change in direction when the fluid flows around the winding end end 21b of the lap and flows into the inner peripheral side thereof can be softened.

Although the scroll compressor has been described in detail in the above embodiment, it is obvious that the present invention is not limited to this and can be applied to an expander (vacuum pump).

[Advantages of the Invention] As described above, according to the present invention, in an oil-free scroll compression or expansion machine with a sealing member attached,
Fixed, without increasing the outer diameter of the orbiting scroll, while preventing an increase in suction resistance generated near the winding end of the wrap of the orbiting scroll while improving the smooth sealing property and durability of the closed space, It is possible to improve the volumetric efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 3 and FIG. 1 are oilless scroll compressors according to an embodiment of the present invention, FIG. 3 is an overall sectional view, and FIG. 1 (A).
(B) shows the shape of the fixed scroll 10 near the suction port, (A) is a plan sectional view of a main part, and (B) is a sectional view thereof. 2 (A) and 2 (B) are schematic views showing the operation of the scroll compressor according to the prior art. 10: fixed scroll, 11: peripheral wall, 12: concave space 13: first wrap, 16: port, 18: conduit 20: orbiting scroll, 21: second wrap

Claims (1)

[Scope of utility model registration request] 1. A conduit that communicates with the port is opened in a concave space surrounded by a peripheral wall provided with a port that functions as a suction port or a discharge port, and the first spiral-shaped space is formed.
By providing a fixed scroll having a wrap and a revolving scroll having a second wrap in a spiral shape that can be fitted with the first wrap, and revolving the revolving scroll with respect to the fixed scroll without rotating the revolving scroll, In a scroll fluid machine configured so that the volume of a closed space formed between the both wraps can be changed, a self-lubricating first fixed scroll surface outside the outermost wrap of the orbiting scroll and facing the surface of the orbiting scroll is provided. 1 seal member, a fixed scroll that forms a closed space facing the scroll sliding surface of the other side, and a self-lubricating second seal member on the wrap end surface of the orbiting scroll, and the first seal member is It is on the anti-orbiting scroll side of the portion provided and is out of the sliding surface of the concave space in which the second wrap slides. In the region, it is formed by extending in a substantially arc shape from the outermost peripheral end of the concave space of the fixed scroll formed in a spiral shape along the inner peripheral surface of the outer peripheral wall, one opening communicating with the port, the other The opening of the second wrap is provided with a guide path so as to directly face the first lap peripheral surface located inside the winding end end of the second lap, and the operation is performed without oiling. Scroll fluid machinery.