JP2971739B2 - Scroll type fluid machine - Google Patents

Abstract

PURPOSE:To prevent the lap parts that have been formed to a fixed scroll and a swirl scroll respectively from being brought into contact with each other at the time of turning operation, and also to enhance the efficiency of compression operation by reducing the load to be caused by turning operation. CONSTITUTION:The lap part 3 of a fixed scroll 1 is deformed by the pressure of gas and the compression heat at the time of compression operation, and for instance, deformed parts A, B are formed. In the deformed parts A and B, since the addendum position of the lap part 3 is dislocated to the inner circumferential side or to the outer circumferential side, in some cases a part of the addendum of the lap part 3 protrudes to the inner circumferential side or to the outer circumferential side. Thus, by previously cutting the side surface of the lap part 3 on the addendum side, thin thickness parts 21, 22 are formed, so that even if deformation is caused to the lap part 3, a part of addendum is prevented from being protruded to the inner circumferential side or to the outer circumferential side. Thereby, at the time of compression operation, the side surface of the lap part 3 can be prevented from being brought into contact with the lap part on the swirl scroll side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type fluid machine suitable for use in, for example, an air compressor or a vacuum pump.

[0002]

2. Description of the Related Art A scroll-type air compressor will be described as an example of a scroll-type fluid machine according to the prior art and will be described with reference to FIGS.

[0003] In the drawings, reference numeral 1 denotes a fixed scroll made of a metal material such as aluminum alloy or cast iron. The fixed scroll 1 has an open end of a casing (not shown) formed substantially in a bottomed cylindrical shape. The casing is fixed to the open end of the casing so as to cover the side. The fixed scroll 1 has a disc-shaped end plate 2 arranged so that the center thereof coincides with an axis O1-O1 of a drive shaft 9 described later, and a tooth bottom surface of the end plate 2 as shown in FIG. 2A
And a support portion 4 which is located on the outer peripheral side of the end plate 2 and is formed in a cylindrical shape so as to surround the wrap portion 3.

[0004] The wrap portion 3 is formed integrally with the end plate 2, the tip of which is a tooth tip surface 3 A, the inner peripheral side of each spirally curved side surface is an inner peripheral surface 3 B, and the outer peripheral side is an outer peripheral surface 3 C.
It has become.

[0005] Reference numeral 5 denotes an orbiting scroll provided in the casing so as to face the fixed scroll 1 and made of the same metal material as the fixed scroll 1.
The orbiting scroll 5 has a disk-shaped end plate 6 whose surface side is a tooth bottom surface 6A, and a spiral wrap portion 7 standing from the tooth bottom surface 6A of the end plate 6 toward the end plate 2 of the fixed scroll 1. And a boss 8 provided at the center of the rear side of the end plate 6. The boss 8 is rotatably attached to a crank 9A of a drive shaft 9 described later.

The wrap portion 7 is formed integrally with the end plate 6 in the same manner as the wrap portion 3 of the fixed scroll 1, and its tip is a tooth tip surface 7 A. The peripheral side is an inner peripheral surface 7B, and the outer peripheral side is an outer peripheral surface 7C.

Reference numeral 9 denotes a drive shaft rotatably provided on the casing. The drive shaft 9 is a crank 9A whose tip end extends into the casing, and the crank 9A has an axis O2.
−O2 is a predetermined dimension δ with respect to the axis O1 −O1 of the drive shaft 9.
Only eccentric. And, the crank 9A of the drive shaft 9
The orbit supports the boss portion 8 of the orbiting scroll 5 via a orbiting bearing 10 so as to be able to orbit, and imparts orbiting motion to the orbiting scroll 5 via a rotation preventing mechanism (not shown) or the like.

Here, the fixed scroll 1 and the orbiting scroll 5 are arranged such that the axis O2-O2 is eccentric by the dimension δ with respect to the axis O1-O1. It is disposed so as to be superimposed on the portion 3 while being shifted by a predetermined angle in the circumferential direction.
Thereby, when the orbiting scroll 5 is turned with respect to the fixed scroll 1, the plurality of crescent-shaped compression chambers 11, 1 whose volume is continuously reduced between the wrap portions 3, 7 is formed.
1,... Are defined.

Further, when the orbiting scroll 5 orbits, the fixed scroll 1 and the orbiting scroll 5 are brought into contact with each other, and the tip surfaces 3A and 7A of the wrap portions 3 and 7 are brought into contact. Positioning is performed so that minute clearances are formed at various places so as not to contact the tooth bottom surfaces 6A and 2A of the other party.

That is, as shown in FIG. 14, a small clearance S1 is formed between the tooth tip surface 3A of the wrap portion 3 on the fixed scroll 1 side and the tooth bottom surface 6A on the orbiting scroll 5 side. A minute clearance S2 is formed between the tooth tip surface 7A of the wrap portion 7 on the side and the tooth bottom surface 2A on the fixed scroll 1 side. When the orbiting scroll 5 orbits and the wrap portion 7 on the orbiting scroll 5 is closest to the wrap portion 3 on the fixed scroll 1 side, the inner peripheral surface 3B of the wrap portion 3 and the outer peripheral surface of the wrap portion 7 are provided. 7C
And a small clearance S3 is formed between them.

The clearances S1, S2, S
The width 3 is desirably narrow in order to enhance the airtightness of each compression chamber 11, but is set to a predetermined size in consideration of the thermal expansion of the wrap portions 3 and 7.

Reference numerals 12 and 13 denote a suction port and a discharge port, respectively, formed in the fixed scroll 1. The suction port 12 is connected to the end plate 2 so as to communicate with the outermost compression chamber 11.
The discharge port 13 is formed at the center of the end plate 2 so as to communicate with the innermost compression chamber 11.

The scroll-type air compressor according to the prior art has the above-mentioned configuration, and its operation will be described below.

First, when the drive shaft 9 is driven to rotate by a drive source (not shown) such as a motor from outside the casing,
This rotation is performed from the crank 9A of the drive shaft 9 to the slewing bearing 10
To the orbiting scroll 5, and the orbiting scroll 5 makes a revolving motion having a revolving radius of dimension δ about the axis O 1 -O 1 of the drive shaft 9.

The compression chambers 11, 11,... Defined between the wrap portions 3, 7 by this swirling motion are continuously reduced toward the center side, and the air sucked from the suction port 12 is sequentially reduced. The compressed air is discharged from the discharge port 13 while being compressed.
From the air tank to an external air tank (not shown).

[0016]

In the prior art described above, the wrap portion 3 of the fixed scroll 1 or the wrap portion 7 of the orbiting scroll 5 is affected by the gas pressure, compression heat and the like during the compression operation. In some cases, the end plate was deformed so as to be inclined with respect to the plane direction, and it was found that this deformation occurred at one or more positions in the spiral direction of each of the wrap portions 3 and 7.

More specifically, as shown by the arrow in FIG. 13, the outer peripheral side of the wrap portion 3 of the fixed scroll 1 is deformed in the direction of the arrow so as to be inclined inward in the radial direction. It was found that the side deformed in the direction indicated by the arrow so as to incline radially outward. In addition, it was found that the degree of deformation was small at the radially intermediate portion, and it was not substantially inclined to the inner peripheral side or the outer peripheral side.

For this reason, the fixed scroll 1 shown in FIG.
In the lap portion 3 of the above, for example, a portion at a point A (hereinafter, referred to as “deformed portion A”) has a tip side of the wrap portion 3 as shown in FIG. The fixed scroll 1 is deformed so as to be inclined toward the inner peripheral side (the right side in FIG. 15). As a result, the position of the tooth tip of the deformed portion A is shifted to the inner peripheral side as compared with when the deformed portion A is not deformed.

In the wrap portion 3 in FIG. 13, for example, a portion at a point B (hereinafter referred to as a “deformed portion B”) has a longitudinal section of the wrap portion 3 as shown in FIG. The tip of the wrap portion 3 is deformed so as to be inclined toward the outer peripheral side of the fixed scroll 1 (the left side in FIG. 16). As a result, the position of the tooth tip of the deformed portion B is shifted to the outer peripheral side as compared with when it is not deformed.

As described above, in the prior art, the deformed portions A and B as described above are provided on the wrap portion 3 of the fixed scroll 1 in FIG.
3 are formed at a plurality of places other than those shown in FIG.
Similar deformation portions are also formed at a plurality of locations on the wrap portion 7 of the orbiting scroll 5.

When the above-mentioned deformed portions A, B, etc. are formed in the wrap portion 3 (7), when the orbiting scroll 5 orbits during the compression operation, the wrap portion 3 (7) is formed.
Inner peripheral surface 3B and outer peripheral surface 7C of lap portion 7 opposed thereto
Or the outer peripheral surface 3C of the wrap portion 3 comes into contact with the inner peripheral surface 7B of the wrap portion 7 opposed thereto, and this contact acts as a large load on the orbiting motion of the orbiting scroll 5. As a result, an extra load is imposed on the drive source or the like that orbits the orbiting scroll 5, and there is a problem that the efficiency of the compression operation is significantly reduced.

The present invention has been made in view of the above-mentioned problems of the prior art, and even if at least one of the wrap portions of the fixed scroll and the orbiting scroll is deformed during the compression operation, the side surface of the wrap portion is formed. However, it is an object of the present invention to provide a scroll-type fluid machine that can prevent contact with another wrap portion at a position adjacent to and adjacent to the wrap portion and reduce the load of the orbiting motion of the orbiting scroll.

[0023]

In order to solve the above-mentioned problems, a scroll type fluid machine employed by the present invention comprises a fixed scroll having a spiral wrap portion provided on the bottom surface of a toothed surface of a head plate, A revolving scroll provided opposite to the scroll, and having a spiral wrap portion erected on the tooth bottom surface of the end plate so as to define a plurality of compression chambers with the wrap portion of the fixed scroll. .

The features of the configuration adopted by the present invention are as follows:
At least one of the wrap portions of the fixed scroll and the orbiting scroll has a thin portion having a thickness at the tooth tip side smaller than a thickness at the tooth bottom side in the spiral direction of the wrap portion.
Or at a plurality of locations.

[0025]

According to the above construction, even when the lap portion is deformed so as to be inclined with respect to the horizontal direction of the head plate due to the influence of the pressure and heat during the compression operation, a thin portion is formed at the deformed portion. By doing so, it is possible to prevent the side surface of the wrap portion from contacting another wrap portion located at a position adjacent to the wrap portion.

Further, the deformation of the wrap portion during the compression operation occurs not only at one location in the spiral direction of the wrap portion but at a plurality of locations, and the degree of the deformation is not constant. Therefore, the thin portion is formed at each of the deformed portions, and has a shape adapted to the degree of deformation at each of the deformed portions. Accordingly, it is possible to reliably prevent the side surface of the wrap portion from contacting another wrap portion located at a position facing the adjacent wrap portion at various places.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the embodiment, FIG.
The same components as those of the prior art shown in FIG. 16 are denoted by the same reference numerals, and description thereof will be omitted.

First, a first embodiment of the present invention will be described with reference to FIGS.

In the drawing, 21, 21,... Indicate thin portions on the inner circumferential side formed on the inner circumferential surface 3B of the wrap portion 3 of the fixed scroll 1, and each thin portion 21 is formed of the wrap portion 3.
As shown by an inward arrow in FIG. 13, the tooth tip is formed at a location corresponding to a location where the tip is deformed inward.

Here, the thin portion 21 on the inner peripheral side is formed at one or a plurality of positions along the spiral direction of the wrap portion 3 so that the wrap portion 3 is uniformly deformed according to temperature, load distribution conditions and the like. It is formed with intervals. In this case, the thin portion 21
The number and the interval correspond to portions where the thermal deformation of the wrap portion 3 can be suppressed during the compression operation.

In each of the thin portions 21, as shown in FIG. 3, a slope 21A is formed on the inner peripheral surface 3B of the wrap portion 3, and the thickness of the wrap portion 3 is determined by the height of the wrap portion 3. The shape is gradually reduced so as to draw a gentle curve from the middle part in the direction toward the tooth tip. As a result, the wrap portion 3
The thickness d1 of the tooth tip is the thickness d of the wrap portion 3 on the bottom side of the tooth.
It is less than 0.

As shown in FIGS. 1 and 2, each of the thin portions 21 has a certain length (length dimension e1) along the length direction (the spiral direction) of the wrap portion 3. Is formed. The thickness of the thin portion 21 at the tooth tip side of the wrap portion 3 becomes thinnest at the center position in the length direction, and gradually increases from the center position to both sides in the length direction. The wrap portion 3 is formed to have the same thickness as the tooth bottom side.

Here, each of the thin portions 21 is formed in such a shape as to correct the thermal deformation of the wrap portion 3, and each of the thin portions 2 is formed.
1 (for example, the aforementioned thickness dimension d1 and length dimension e)
1) is determined by the degree of deformation of the wrap portion 3. For example, in the deformed portion A as described above, as shown in FIG. 15, when the tooth tip side of the wrap portion 3 is deformed so as to be inclined toward the inner peripheral side of the fixed scroll 1 and the thin portion 21 is not formed, The position of the tooth tip of the deformed portion A is shifted to the inner peripheral side, and a part of the tooth tip protrudes toward the inner peripheral side.

Therefore, the formation of such a deformed portion A is predicted based on data such as a test, and the formation of the deformed portion A causes a part of the tooth tip of the wrap portion 3 to move from the normal state. A portion that will protrude to the inner peripheral side is cut and removed in advance. This cut portion is the thin portion 21
It is. Accordingly, the thickness dimension d1 and the length dimension e1 of the thin portion 21 are set to dimensions corresponding to the amount by which the tooth tip of the wrap portion 3 protrudes toward the inner peripheral side in the deformed portion A.

Are the outer peripheral surfaces 3C of the wrap portion 3.
The thin portion on the outer peripheral side formed in
Is formed in the wrap portion 3 at a location corresponding to a portion that deforms outward as indicated by an outward arrow in FIG.

The detailed shape of each thin portion 22 is as follows:
Each of the thin portions 22 is substantially the same as the thin portions 21, and as shown in FIG. 4, a slope 22A is formed on the outer peripheral surface 3C of the wrap portion 3, and the thickness dimension d2 of the tip of the wrap portion 3 is reduced. The thickness is smaller than the thickness d0 of the wrap portion 3 on the tooth bottom side.

Each of the thin portions 22 is formed to have a certain length (length dimension e2) along the length direction (the spiral direction) of the wrap portion 3. And each of the thin portions 2
2, the thickness of the wrap portion 3 on the tooth tip side becomes thinnest at the center position in the length direction and gradually increases from the center position to both sides in the length direction. It is formed so as to have the same thickness as the bottom side.

Here, each of the thin portions 22 is formed in such a shape as to correct the thermal deformation of the wrap portion 3.
2 (for example, the thickness dimension d2 and the length dimension e described above)
2) is determined by the degree of deformation of the wrap portion 3.
For example, in the deformed portion B as described above, the tooth tip side of the wrap portion 3 is deformed so as to be inclined to the outer peripheral side of the fixed scroll 1 as shown in FIG. The position of the tooth tip of the portion B is shifted to the outer peripheral side, and a part of the tooth tip protrudes to the outer peripheral side.

Therefore, the formation of such a deformed portion B is predicted based on data such as tests, and the formation of the deformed portion B causes a part of the tooth tip of the wrap portion 3 to protrude to the outer peripheral side. The part which will be different is cut in advance and removed. This cut portion is the thin portion 22. Therefore, the thickness d2 and the length e2 of the thin portion 22 are set to dimensions corresponding to the amount of the tooth tip of the wrap portion 3 protruding to the outer peripheral side in the deformed portion B.

The thin portions 21 and 22 are formed by cutting the inner peripheral surface 3B and the outer peripheral surface 3C of the wrap portion 3 using a tool such as a ball end mill.

The wrap portion 7 of the orbiting scroll 5 also has a thin portion at a position corresponding to the wrap portion 7 of the orbiting scroll 5 as in the case of the fixed scroll 1.

The scroll type air compressor according to the present embodiment has the above-described configuration, and its basic compression operation is not particularly different from that of the prior art.

However, by forming the thin portions 21 and 22 in portions of the wrap portion 3 (7) where thermal deformation or the like occurs, the wrap portion 3 (7) can reduce the pressure of the gas during the compression operation.
Under the influence of heat of compression or the like, the end plate is deformed so as to be inclined with respect to the plane direction of the head plate. For example, even if deformed portions A and B are formed, Part of the tip can be reliably prevented from protruding toward the inner peripheral side or the outer peripheral side. As a result, when the orbiting scroll 5 orbits, the inner peripheral surface 3B of the wrap portion 3 and the outer peripheral surface 7C of the wrap portion 7 facing the wrap portion 3 or the outer peripheral surface 3C of the wrap portion 3 and the wrap facing the wrap portion 3 face the wrap portion. The contact with the inner peripheral surface 7B of the portion 7 can be reliably prevented.

Thus, in this embodiment, the wrap portion 3
Of (7), thin portions 21 and
Since the wrap portion 3 (7) is deformed under the influence of the pressure of the compressed air, heat of compression, and the like, and the deformed portions A and B are formed, the orbiting scroll 5 is turned. During the movement, the contact between the wrap portions 3 and 7 can be reliably prevented, so that a load such as frictional resistance due to the contact between the wrap portions 3 and 7 can be eliminated. Therefore, according to the present embodiment, it is possible to reduce an unnecessary load on a drive source or the like for orbiting the orbiting scroll 5, and it is possible to greatly reduce electric power or the like for driving the drive source.

The thin portions 21, 22, etc. are appropriately formed corresponding to the portions where the deformed portions A, B, etc., which are predicted by the data of the test, etc., and the inclined portions A, B, etc. are formed. Wrap part 3,
The clearance (S3 in FIG. 14) can be set to be as small as necessary. Thereby, the discharge amount of the compressed air can be increased, and the compression efficiency can be greatly improved.

Here, the characteristic diagram shown in FIG. 5 shows that the input of the drive shaft when the orbiting scroll 5 is caused to orbit by changing the set amount of the clearance between the wrap portions 3 and 7 (the driving source). (Power consumption) and a test result of how the discharge amount of the compressed air changes. That is,
The horizontal axis in FIG. 5 indicates the set amount of the clearance between the wrap portions 3 and 7, the left vertical axis indicates the drive shaft input, and the right vertical axis indicates the compressed air discharge amount. The solid line P1 in FIG. 5 indicates the input of the drive shaft of the product according to the present embodiment, the dotted line P2 indicates the input of the drive shaft of the conventional product, and the solid line Q1 indicates the compression of the product according to the present embodiment. Air discharge amount, dotted line Q2
Shows the discharge amount of the compressed air of the conventional product.

According to this, it is understood that when the clearance between the wrap portions 3 and 7 is reduced, the input of the drive shaft is reduced although the discharge amount of the compressed air is substantially equal. In particular, the clearance between the wrap portions 3 and 7 should be 20
When the input of the drive shaft is set to [μm], a comparison between the two shows that the product of the present embodiment is significantly smaller.

Therefore, as described in the present embodiment, the thin portions 21, 22 and the like are formed in the wrap portion 3 (7),
By setting the clearance between 7 to about 20 [μm], the performance as a compressor can be greatly improved. In addition, since the operation of forming the thin portions 21 and 22 at the time of manufacturing is a simple operation that can be performed without changing the current manufacturing process, the manufacturing efficiency can be maintained as it is.

Next, a second embodiment of the present invention will be described with reference to FIGS. The feature of the present embodiment lies in the cross-sectional shape of the thin portion, a step portion is formed on the peripheral surface of the wrap portion, and the thickness dimension of the wrap portion is reduced from the middle portion in the height direction of the wrap portion to the tooth tip. It is in.

In the drawing, reference numeral 31 denotes a thin portion on the inner circumferential side according to the present embodiment formed on the inner circumferential surface 3B of the wrap portion 3 of the fixed scroll 1, and the thin portion 31 is described in the first embodiment. Similarly to the thin portion 21, the wrap portion 3 is formed at a location corresponding to a portion that is deformed inward as indicated by an inward arrow in FIG. In the thin portion 31, as shown in FIG. 7, a step portion 31A is formed on the inner peripheral surface 3B of the wrap portion 3, and the thickness of the wrap portion 3 from the middle in the height direction of the wrap portion 3 to the tooth tip. The thickness d3 is formed so as to be smaller than the thickness d0 on the tooth bottom side.

The thin portion 31 has a certain length along the length direction (spiral direction) of the wrap portion 3, similarly to the thin portion 21 described in the first embodiment. Are formed over a wide range to some extent. The thickness of the thin portion 31 at the tooth tip side of the wrap portion 3 becomes thinnest around the longitudinal center position, and gradually increases on both sides in the longitudinal direction with this position as the center. Wrap part 3
It is formed so as to have the same thickness as the root side.

Reference numeral 32 denotes a thin portion on the outer peripheral side formed on the outer peripheral surface 3C of the wrap portion 3. The thin portion 32 is the same as the thin portion 22 described in the first embodiment. 13, are formed at locations corresponding to the portions that are deformed outward as indicated by outward arrows. The detailed shape of the thin portion 32 is substantially the same as that of the thin portion 31. In the thin portion 32, as shown in FIG.
A step portion 32A is formed on the outer peripheral surface 3C of the wrap portion 3, and the thickness d4 of the tooth tip of the wrap portion 3 is smaller than the thickness dimension d0 of the wrap portion 3 on the tooth bottom side.

Here, the thin portions 31 and 32 are formed in the same manner as the thin portions 21 and 22 described in the first embodiment.
Is formed in such a shape as to correct the deformation of the thin portion 3
The shapes (eg, thickness dimensions d3, d4, etc.) of
The point determined by the degree of deformation of the wrap portion 3 is the same as in the first embodiment. Note that, similarly to the fixed scroll 1, the wrap portion 7 of the orbiting scroll 5 is formed with a thin portion at a position corresponding to the wrap portion 7 of the orbiting scroll 5.

According to the present embodiment configured as described above, the same operation and effect as those of the first embodiment can be obtained.

Next, a third embodiment of the present invention will be described with reference to FIGS. The feature of this embodiment lies in the cross-sectional shape of the thin portion, and the thickness dimension of the wrap portion is linearly reduced from the middle portion in the height direction of the wrap portion toward the tooth tip of the wrap portion.

In the drawing, reference numeral 41 denotes an inner peripheral thin portion formed on the inner peripheral surface 3B of the wrap portion 3 of the fixed scroll 1 according to the present embodiment. The thin portion 41 is described in the first embodiment. Similarly to the thin portion 21, the wrap portion 3 is formed at a location corresponding to a portion that is deformed inward as indicated by an inward arrow in FIG. In the thin portion 41, an inclined surface 41A is formed on the inner peripheral surface 3B of the wrap portion 3 in substantially the same manner as the thin portion 21 according to the first embodiment, and the thickness dimension d5 of the wrap portion 3 tooth tip is The shape is smaller than the thickness d0 on the bottom side. However, the thin portion 41 is
Unlike the thin portion 21 according to the first embodiment, the surface of the slope 41A is formed in a straight line from the middle in the height direction of the wrap portion 3 toward the tooth tip as shown in FIG.

Reference numeral 42 denotes a thin portion on the outer peripheral side formed on the outer peripheral surface 3C of the wrap portion 3. The thin portion 42 is the same as the thin portion 22 described in the first embodiment. 13, are formed at locations corresponding to the portions that are deformed outward as indicated by outward arrows. The detailed shape of the thin portion 42 is substantially the same as that of the thin portion 41. As shown in FIG.
A linear slope 42A is formed on the outer peripheral surface 3C of the wrap portion 3, and the thickness d6 of the tooth tip of the wrap portion 3 is smaller than the thickness dimension d0 of the wrap portion 3 on the tooth bottom side.

Here, the thin portions 41 and 42 are formed in the same manner as the thin portions 21 and 22 described in the first embodiment.
Is formed in such a shape as to correct the deformation of
The shapes of 1, 42 (for example, thickness dimensions d5, d6, etc.)
The point determined by the degree of deformation of the wrap portion is the same as in the first embodiment. Also, as with the fixed scroll 1, the wrap portion 7 of the orbiting scroll 5 is formed with a thin portion at a position corresponding to the wrap portion 7 of the orbiting scroll 5.

According to the present embodiment configured as described above, the same operation and effect as those of the first embodiment can be obtained.

The number and interval of the thin portions provided in the spiral direction of the wrap portion 3 of the fixed scroll 1 and the wrap portion 7 of the orbiting scroll 5 are not limited to the above embodiments.
In addition, a configuration in which a thin portion is provided only in at least one of the wrap portions of the fixed scroll 1 and the orbiting scroll 5 may be adopted.

The shape of each thin portion is not limited to the shape described in the first to third embodiments, but various shapes such as a mountain-shaped cut groove, a tapered shape, and a semi-elliptical shape are employed. can do.

Further, in each of the above embodiments, the scroll type fluid machine has been described by taking the scroll type air compressor as an example. However, the invention can be widely applied to, for example, a vacuum pump, a refrigerant compressor and the like.

[0063]

As described above in detail, according to the present invention, at least one of the wrap portions of the fixed scroll and the orbiting scroll has a thinner thickness at the tooth tip side than at the tooth bottom side. The wrap portion is formed at one or a plurality of locations in the spiral direction of the wrap portion, so that the wrap portion is deformed so as to be inclined with respect to the horizontal direction of the head plate due to the gas pressure and compression heat during the compression operation. Even, the side of the wrap portion,
It can be reliably prevented from contacting another wrap portion located at a position facing the adjacent side. Thereby, during the compression operation, the load caused by the orbiting movement of the orbiting scroll caused by the contact of each wrap portion can be significantly reduced.

Accordingly, since the orbiting scroll can be orbited with less driving force than before, the power during the compression operation can be reduced, and the efficiency of the compression operation can be improved.

[Brief description of the drawings]

FIG. 1 is a front view showing a fixed scroll of a scroll-type air compressor according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a main part showing an inner peripheral thin portion of the wrap portion according to the first embodiment.

FIG. 3 is a longitudinal sectional view showing an inner peripheral thin portion of the wrap portion according to the first embodiment.

FIG. 4 is a longitudinal sectional view showing an outer peripheral thin portion of a wrap portion according to the first embodiment.

FIG. 5 is a characteristic diagram showing characteristics of an input of a drive shaft of a scroll type air compressor and a discharge amount of compressed air.

FIG. 6 is an essential part perspective view showing an inner peripheral thin portion of a wrap portion according to a second embodiment.

FIG. 7 is a longitudinal sectional view showing an inner peripheral thin portion of a wrap portion according to a second embodiment.

FIG. 8 is a longitudinal sectional view showing an outer peripheral thin portion of a wrap portion according to a second embodiment.

FIG. 9 is a perspective view of an essential part showing an inner peripheral thin portion of a wrap portion according to a third embodiment.

FIG. 10 is a longitudinal sectional view showing an inner peripheral thin portion of a wrap portion according to a third embodiment.

FIG. 11 is a longitudinal sectional view showing an outer peripheral thin portion of a wrap portion according to a third embodiment.

FIG. 12 is a longitudinal sectional view showing a fixed scroll and an orbiting scroll of a scroll-type air compressor according to the related art.

FIG. 13 is a front view showing a fixed scroll according to the related art.

FIG. 14 is an enlarged longitudinal sectional view showing a wrap portion in FIG. 12;

FIG. 15 is a longitudinal sectional view as seen from the direction indicated by arrows XV-XV in FIG. 13;

FIG. 16 is a longitudinal sectional view as seen from the direction indicated by arrows XVI-XVI in FIG. 13;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed scroll 2 End plate 2A Tooth bottom 3 Lapping part 5 Orbiting scroll 6 End plate 6A Tooth bottom 7 Lapping part 11 Compression chamber 21,31,41 Inner peripheral thin part 22,32,42 Outer peripheral thin part

Claims (1)

(57) [Claims] 1. A fixed scroll in which a spiral wrap portion is provided upright on a tooth bottom surface of a head plate, and a plurality of compression chambers are defined between the fixed scroll and a wrap portion of the fixed scroll. In a scroll-type fluid machine including a revolving scroll in which a spiral wrap portion is provided upright on a tooth bottom surface of a head plate to form, at least one of the wrap portions of the fixed scroll and the revolving scroll includes:
A scroll-type fluid machine, wherein a thin portion having a thickness at a tooth tip side smaller than a thickness at a tooth bottom side is formed at one or a plurality of positions in a spiral direction of the wrap portion.