JPH084669A - Scroll type fluid machinery - Google Patents

Abstract

(57) [Abstract] [Purpose] Prevents the wraps formed on the fixed scroll and orbiting scroll from contacting each other during orbiting motion, reducing the load associated with orbiting motion and improving the efficiency of compression operation. Let [Structure] The wrap portion 3 of the fixed scroll 1 is deformed by the pressure of gas and the compression heat during compression operation, and, for example, the deformed portions A and B are formed. In the deformed portions A and B, since the tooth tip positions of the wrap portion 3 are displaced toward the inner peripheral side or the outer peripheral side, a part of the tooth tips of the lap portion 3 may protrude to the inner peripheral side or the outer peripheral side. Therefore, the thin-walled portions 21 and 22 are formed by previously cutting the side surface of the wrap portion 3 on the tooth tip side,
Even if the wrap portion 3 is deformed, a part of the tooth tip is prevented from protruding toward the inner peripheral side or the outer peripheral side. This can prevent the side surface of the wrap portion 3 from coming into contact with the wrap portion on the orbiting scroll side during the compression operation.

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.

In the figure, 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 opening end of a casing (not shown) formed in a cylindrical shape having a bottom. It is fixed to the open end side of the casing so as to cover the side. The fixed scroll 1 has a disk-shaped end plate 2 arranged so that its center coincides with an axis O1 -O1 of a drive shaft 9 which will be described later, and a tooth bottom surface of the end plate 2 as shown in FIG. 2A
A spiral wrap portion 3 standing upright 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.

Further, the wrap portion 3 is formed integrally with the end plate 2, the tip of the wrap portion 3 becomes a tooth tip surface 3A, and the inner peripheral side of each spirally curved side surface is the inner peripheral surface 3B, and the outer peripheral side is the outer peripheral surface 3C.
Has become.

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

Like the wrap portion 3 of the fixed scroll 1, the wrap portion 7 is integrally formed with the end plate 6, and the tip of the wrap portion 7 serves as a tooth tip surface 7A, which is formed on each of the spirally curved side surfaces. The peripheral side is the inner peripheral surface 7B and the outer peripheral side is the outer peripheral surface 7C.

Reference numeral 9 denotes a drive shaft rotatably provided in the casing. The drive shaft 9 is a crank 9A having a tip end extending into the casing, and the crank 9A has its axis O2.
-O2 is a predetermined dimension δ with respect to the axis O1-O1 of the drive shaft 9.
Only eccentric. Then, the crank 9A of the drive shaft 9
The boss portion 8 of the orbiting scroll 5 is rotatably supported via the orbiting bearing 10, and the orbiting scroll 5 is given an orbiting motion via a rotation preventing mechanism (not shown) or the like.

In the fixed scroll 1 and the orbiting scroll 5, the wrap portion 7 of the orbiting scroll 5 is a wrap of the fixed scroll 1 with the axis O2-O2 eccentric with respect to the axis O1-O1 by a dimension δ. It is arranged so as to be superposed on the portion 3 while being offset by a predetermined angle in the circumferential direction.
As a result, when the orbiting scroll 5 is orbited with respect to the fixed scroll 1, the plurality of crescent-shaped compression chambers 11, 1 are continuously reduced in volume between the wrap portions 3, 7.
1, ... are defined.

When the orbiting scroll 5 orbits, the fixed scroll 1 and the orbiting scroll 5 come into contact with each other, or the tooth top surfaces 3A and 7A of the wrap portions 3 and 7 contact each other. 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 partner.

That is, as shown in FIG. 14, a minute clearance S1 is formed between the tooth top 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, and the orbiting scroll 5 A minute clearance S2 is formed between the tooth tip surface 7A of the side wrap portion 7 and the tooth bottom surface 2A of the fixed scroll 1 side. Further, in a state where the orbiting scroll 5 orbits and the wrap portion 7 on the orbiting scroll 5 side 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 7C
A minute clearance S3 is formed between and.

Further, the clearances S1, S2, S
In order to increase the airtightness of each compression chamber 11, it is preferable that the width of the width of the compression chamber 3 is narrow, but it is set to a predetermined size in consideration of thermal expansion of the wrap portions 3 and 7.

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

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

First, when the drive shaft 9 is rotationally driven from the outside of the casing by a drive source (not shown) such as a motor,
This rotation is from the crank 9A of the drive shaft 9 to the slewing bearing 10
Is transmitted to the orbiting scroll 5 via the orbiting scroll 5, and the orbiting scroll 5 makes an orbiting motion having an orbiting radius of 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 swiveling motion are continuously reduced toward the center side, and the air sucked from the suction port 12 is sequentially compressed. While compressed, this compressed air is discharged from the discharge port 13
From an external air tank (not shown) or the like.

[0016]

By the way, in the above-mentioned prior art, the wrap portion 3 of the fixed scroll 1 or the wrap portion 7 of the orbiting scroll 5 is affected by the pressure of the gas during the compression operation, the compression heat, and the like. It was found that there is a case where the wrap portions 3 and 7 are deformed so as to be inclined with respect to the plane direction of the end plate, and this deformation occurs at one or a plurality of positions in the spiral direction of each of the wrap portions 3 and 7.

That is, specifically, as shown by an arrow in FIG. 13, the outer peripheral side of the wrap portion 3 of the fixed scroll 1 is deformed in the arrow direction so as to incline radially inward, and the inner periphery is deformed. On the side, it was found that it deformed in the direction of the arrow so as to incline radially outward. In addition, it was found that the degree of deformation was small in the radial middle portion, and that it did not substantially incline toward the inner peripheral side or the outer peripheral side.

Therefore, the fixed scroll 1 shown in FIG.
Of the lap portion 3, the portion at the point A (hereinafter referred to as “deformation portion A”) has a tooth tip side of the wrap portion 3 as shown in FIG. The fixed scroll 1 is deformed so as to incline toward the inner peripheral side (right side in FIG. 15). As a result, the tooth tip positions of the deformed portion A are displaced more toward the inner peripheral side than when not deformed.

Of the lap portion 3 in FIG. 13, for example, a portion at a point B (hereinafter referred to as "deformation portion B") is shown in FIG. 16 when the vertical cross section of the lap portion 3 at that portion is seen. Further, the tooth top side of the wrap portion 3 is deformed so as to be inclined toward the outer peripheral side (left side in FIG. 16) of the fixed scroll 1. As a result, the position of the addendum of the deformed portion B is displaced more toward the outer peripheral side than when it is not deformed.

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

When the deformed portions A and B as described above are formed in the wrap portion 3 (7), the wrap portion 3 is moved when the orbiting scroll 5 orbits during the compression operation.
Inner peripheral surface 3B and outer peripheral surface 7C of the wrap portion 7 opposed to the inner peripheral surface 3B
Or the outer peripheral surface 3C of the wrap portion 3 and the inner peripheral surface 7B of the wrap portion 7 facing the outer peripheral surface 3C come into contact with each other, and this contact acts as a large load for the orbiting movement of the orbiting scroll 5. As a result, an extra load is applied to the drive source or the like that causes the orbiting scroll 5 to orbit, and there is a problem that the efficiency of 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. However, it is an object of the present invention to provide a scroll type fluid machine capable of preventing contact with another lap portion at an opposite position on the adjacent side thereof and reducing the load of the orbiting motion of the orbiting scroll.

[0023]

In order to solve the above problems, a scroll type fluid machine adopted by the present invention is a fixed scroll in which a spiral wrap portion is erected on the tooth bottom surface of an end plate, and the fixed scroll. And a revolving scroll which is provided so as to face the scroll and has a spiral wrap portion standing 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 is provided with a thin portion having a thickness on the tooth tip side smaller than a thickness on the tooth bottom side in the spiral direction of the wrap portion.
It is formed in one or more places.

[0025]

According to the above structure, even if the lap portion is deformed to be inclined with respect to the horizontal direction of the end plate due to the influence of the pressure and the compression heat during the compression operation, the thin portion is formed at the deformed portion. By doing so, it is possible to prevent the side surface of the lap portion from coming into contact with another lap portion at a position opposite to the side surface of the lap portion.

Further, the deformation of the lap portion during the compression operation is not limited to one location in the spiral direction of the wrap portion, but occurs at a plurality of locations, and the degree of deformation is not constant. Therefore, the thin-walled portion is formed at each deformed portion and has a shape according to the degree of deformation at each deformed portion. Thereby, it is possible to reliably prevent the side surface of the lap portion from contacting another lap portion at a position adjacent to and adjacent to the side surface of the lap portion.

[0027]

Embodiments of the present invention will be described below with reference to FIGS. In addition, in the embodiment, the above-described FIG.
The same components as those in the conventional technique shown in FIG. 16 are designated by the same reference numerals, and the description thereof will be omitted.

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

In the figure, reference numerals 21, 21, ... Denote thin-walled 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-walled portion 21 of the wrap portion 3 is
As shown by the arrow pointing inward in FIG. 13, the tooth tips are formed at locations corresponding to the locations where they are deformed inward.

Here, the thin portion 21 on the inner peripheral side is provided at one or a plurality of locations 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 a space. In this case, the thin portion 21
The number and intervals of the two correspond to the parts capable of suppressing thermal deformation of the lap portion 3 during the compression operation.

As shown in FIG. 3, in each thin portion 21, a slant surface 21A is formed on the inner peripheral surface 3B of the wrap portion 3, and the thickness dimension of the wrap portion 3 is 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 dimension d1 of the addendum is the thickness dimension d on the tooth bottom side of the wrap portion 3.
It is smaller than 0.

As shown in FIGS. 1 and 2, each thin portion 21 has a certain length (length dimension e1) along the length direction of the wrap portion 3 (the spiral direction). Has been formed. The thin-walled portion 21 has the thinnest tip-side thickness of the lap portion 3 at the center position in the lengthwise direction, and the tip thickness is gradually increased from the center position to both sides in the lengthwise direction. Finally, it is formed so as to have the same thickness as the root side of the wrap portion 3 in the end.

Here, each thin portion 21 is formed in a shape that corrects thermal deformation of the wrap portion 3, and each thin portion 2 is formed.
1 shape (for example, the thickness dimension d1 and the length dimension e described above)
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, in the state in which the tooth tip side of the lap 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 tooth tip position of the deformed portion A is displaced to the inner peripheral side, and a part of the tooth tip comes out to the inner peripheral side.

Therefore, by predicting that such a deformed portion A will be formed from data of a test or the like, by forming the deformed portion A, a part of the tooth tip of the lap portion 3 is more than normal. The part that is likely to protrude to the inner peripheral side is cut and removed in advance. This cut portion is the thin portion 21
Is. Therefore, the thickness dimension d1 and the length dimension e1 of the thin portion 21 are set to the dimensions corresponding to the amount by which the tip of the wrap portion 3 protrudes toward the inner peripheral side in the deformed portion A.

Reference numerals 22, 22, ... Show an outer peripheral surface 3C of the wrap portion 3.
The thin-walled portions on the outer peripheral side formed on the
Is formed at a portion of the wrap portion 3 corresponding to a portion that is deformed outward as indicated by an outward arrow in FIG.

The detailed shape of each thin portion 22 is as follows.
The thin-walled portions 21 are substantially similar to the thin-walled portions 21, and in the thin-walled portions 22, as shown in FIG. It is smaller than the thickness dimension d0 of the wrap portion 3 on the tooth bottom side.

Each thin portion 22 is formed to have a certain length (length dimension e2) along the length direction (spiral direction) of the wrap portion 3. And each thin portion 2
In No. 2, the thickness of the wrap portion 3 on the tip side of the tooth is thinnest at the center position in the longitudinal direction, and the thickness gradually increases as it spreads from this center position to both sides in the longitudinal direction. It is formed to have the same thickness as the bottom side.

Here, each thin-walled portion 22 is formed in a shape that corrects thermal deformation of the lap portion 3, and each thin-walled portion 2 is formed.
2 shape (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, as shown in FIG. 16, the tip side of the wrap portion 3 is deformed so as to be inclined toward the outer peripheral side of the fixed scroll 1, and the thin portion 22 is not deformed. The tooth tip position of the portion B is displaced to the outer peripheral side, and part of the tooth tip protrudes to the outer peripheral side.

Therefore, by predicting that such a deformed portion B will be formed from data of a test or the like, by forming the deformed portion B, a part of the tooth tip of the lap portion 3 protrudes to the outer peripheral side. Preliminarily cut and remove the likely parts. This cut portion is the thin portion 22. Therefore, the thickness dimension d2 and the length dimension e2 of the thin portion 22 are set to the dimensions corresponding to the amount by which the tip of the wrap portion 3 protrudes 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 lap portion 3 with a tool such as a ball end mill.

As with the fixed scroll 1, the wrap portion 7 of the orbiting scroll 5 is also formed with a thin portion at a corresponding portion of the wrap portion 7 of the orbiting scroll 5.

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

However, by forming the thin-walled portions 21 and 22 in the portion of the lap portion 3 (7) where thermal deformation or the like occurs, the lap portion 3 (7) can reduce the gas pressure during the compression operation,
Even if deformed to be inclined with respect to the plane direction of the end plate under the influence of the compression heat and the deformed portions A, B, etc. are formed, the teeth of the wrap portion 3 in each deformed portion A, B, etc. It is possible to reliably prevent a part of the tip from protruding to 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 opposite thereto. It is possible to reliably prevent contact with the inner peripheral surface 7B of the portion 7.

Thus, in this embodiment, the wrap portion 3
In (7), the thin-walled portions 21 and 2 are formed in a portion where thermal deformation or the like occurs
Since it is configured to form 2 or the like, even if the wrap portion 3 (7) is deformed due to the influence of the pressure of compressed air, the heat of compression, etc., and the deformed portions A, B, etc. are formed, the orbiting scroll 5 orbits. It is possible to reliably prevent the lap portions 3 and 7 from coming into contact with each other during exercise, and thereby to eliminate a load such as a frictional resistance due to the contact of the lap portions 3 and 7. Therefore, according to the present embodiment, it is possible to reduce the extra load on the drive source or the like that causes the orbiting scroll 5 to orbit, and to significantly reduce the power or the like for driving the drive source.

The thin portions 21, 22 and the like are appropriately formed corresponding to the portions where the deformed portion A, the deformed portion B and the like predicted by the data of the test and the like occur, and the inclined portions of the deformed portions A, B and the like are formed. The wrap portion 3, which is formed according to the degree of
It is possible to set the clearance between 7 (S3 shown in FIG. 14) as narrow as necessary. As a result, the discharge amount of compressed air can be increased and the compression efficiency can be significantly improved.

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

According to this, it can be seen that when the clearance between the wrap portions 3 and 7 is narrowed, the input of the drive shaft becomes small although the discharge amount of the compressed air is almost the same. Especially, the clearance between the lap parts 3 and 7 is 20
When the input of the drive shaft is compared between the two when the setting is [μm], it can be seen that the product in which the present embodiment is implemented is significantly smaller.

Therefore, as described in the present embodiment, the thin portions 21, 22 and the like are formed on the lap portion 3 (7), and the lap portion 3,
By setting the clearance between 7 to about 20 [μm], the performance as a compressor can be significantly improved. Moreover, at the time of manufacturing, since the work of forming the thin portions 21, 22 and the like can be performed without changing the existing 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 is that the thin-walled portion has a cross-sectional shape, a step portion is formed on the peripheral surface of the lap portion, and the thickness dimension of the lap portion is reduced from the middle portion in the height direction of the lap portion to the tooth tip. Especially.

In the figure, reference numeral 31 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 31 is described in the first embodiment. Similar to the thin portion 21, the wrap portion 3 is formed at a portion corresponding to a portion that is deformed inward as indicated by an inward arrow in FIG. Then, in the thin portion 31, as shown in FIG. 7, a step portion 31A is formed on the inner peripheral surface 3B of the lap portion 3, and the thickness of the lap portion 3 from the middle portion in the height direction of the lap portion 3 to the tooth tip is formed. The thickness dimension d3 is formed to be smaller than the thickness dimension d0 on the tooth bottom side.

Further, the thin portion 31 has a certain length along the length direction (the spiral direction) of the wrap portion 3 in the same manner as the thin portion 21 described in the first embodiment. , Is formed over a wide range to some extent. The thin-walled portion 31 has the thinnest tip-side thickness of the wrap portion 3 around the center position in the lengthwise direction, and the thickness gradually increases on both sides in the lengthwise direction with this position as the center. Wrap part 3
It is formed to have the same thickness as the tooth bottom side.

Reference numeral 32 denotes an outer peripheral thin-walled portion formed on the outer peripheral surface 3C of the wrap portion 3. The thin-walled portion 32 is similar to the thin-walled portion 22 described in the first embodiment in the lap portion 3. 13 is formed at a portion corresponding to a portion that is deformed outward as indicated by an outward arrow in FIG. The detailed shape of the thin wall portion 32 is substantially the same as that of the thin wall portion 31, and in the thin wall portion 32, as shown in FIG.
A step portion 32A is formed on the outer peripheral surface 3C, and the thickness dimension d4 of the 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-walled portions 31 and 32 are similar to the thin-walled portions 21 and 22 described in the first embodiment, and the lap portion 3 is used.
Is formed to correct the deformation of the thin portion 3
The shapes of 1, 32 (for example, thickness dimensions d3, d4, etc.) are
The point determined by the degree of deformation of the wrap portion 3 is the same as in the first embodiment. As with the fixed scroll 1, the wrap portion 7 of the orbiting scroll 5 is also formed with a thin portion at a corresponding portion of the wrap portion 7 of the orbiting scroll 5.

According to this embodiment having the above-described structure, it is possible to obtain the same effects as those of the first embodiment.

Next, a third embodiment of the present invention will be described with reference to FIGS. The present embodiment is characterized in that the thin-walled portion has a cross-sectional shape, 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 tips of the wrap portion.

In the figure, 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. Similar to the thin portion 21, the wrap portion 3 is formed at a portion corresponding to a portion that is deformed inward as indicated by an inward arrow in FIG. Then, in the thin portion 41, a slant surface 41A is formed on the inner peripheral surface 3B of the wrap portion 3 and the thickness dimension d5 of the tooth tip of the wrap portion 3 is substantially the same as the thin portion 21 according to the first embodiment. The shape is smaller than the thickness dimension d0 on the bottom side. However, the thin portion 41 is
Unlike the thin wall portion 21 according to the first embodiment, the surface of the inclined surface 41A is linearly formed from the middle portion in the height direction of the lap portion 3 toward the tooth tip, as shown in FIG.

Reference numeral 42 denotes a thin-walled portion on the outer peripheral side formed on the outer circumferential surface 3C of the wrap portion 3. The thin-walled portion 42 is similar to the thin-walled portion 22 described in the first embodiment in the wrap portion 3. 13 is formed at a portion corresponding to a portion that is deformed outward as indicated by an outward arrow in FIG. The detailed shape of the thin portion 42 is substantially the same as that of the thin portion 41. As shown in FIG.
A straight slope 42A is formed on the outer peripheral surface 3C, and the thickness dimension d6 of the 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 the same as the thin portions 21 and 22 described in the first embodiment, and the lap portion 3 is used.
Formed to correct the deformation of the thin portion 4
The shapes of 1, 42 (for example, thickness dimensions d5, d6, etc.) are
The point determined by the degree of deformation of the lap portion is the same as in the first embodiment. Further, also in the wrap portion 7 of the orbiting scroll 5, as in the fixed scroll 1, a thin portion is formed at a corresponding position of the wrap portion 7 of the orbiting scroll 5.

Also according to the present embodiment having the above-mentioned structure, it is possible to obtain the same effects as those of the first embodiment.

The number and interval of the thin-walled 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 those in the above embodiments.
Moreover, the thin portion may be provided only in at least one of the wrap portions of the fixed scroll 1 and the orbiting scroll 5.

Further, the shape of each thin portion is not limited to the shape described in the first to third embodiments, and various shapes such as a kerf, a taper shape and a semi-elliptical shape are adopted. can do.

Further, in each of the above-mentioned embodiments, the scroll type air compressor has been described as an example of the scroll type fluid machine, but it 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, in at least one of the wrap portions of the fixed scroll and the orbiting scroll, the thin thickness at the tooth tip side is thinner than the thickness at the tooth bottom side. Since the portion is formed at one or more positions in the spiral direction of the wrap portion, the wrap portion is deformed so as to be inclined with respect to the horizontal direction of the end plate due to the pressure of the gas and the compression heat during the compression operation. However, the side surface of the wrap is
It is possible to reliably prevent contact with another lap portion at a position opposite to the adjacent lap portion. As a result, the load associated with the orbiting movement of the orbiting scroll, which is caused by the contact of the wrap portions during the compression operation, can be significantly reduced.

Therefore, since the orbiting scroll can be orbitally moved with a smaller driving force than in the conventional case, the power during the compression operation can be reduced and the efficiency of the compression operation can be improved.

[Brief description of drawings]

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

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

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

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

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

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

FIG. 7 is a vertical cross-sectional view showing an inner peripheral side thin portion of a wrap portion according to a second embodiment.

FIG. 8 is a vertical cross-sectional view showing an outer peripheral side 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 side thin portion of a wrap portion according to a third embodiment.

FIG. 10 is a vertical cross-sectional view showing an inner peripheral side thin portion of a wrap portion according to a third embodiment.

FIG. 11 is a vertical cross-sectional view showing an outer peripheral side thin portion of a wrap portion according to a third embodiment.

FIG. 12 is a vertical cross-sectional view showing a fixed scroll and an orbiting scroll of a scroll air compressor according to a conventional technique.

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

FIG. 14 is an enlarged vertical cross-sectional view showing a wrap portion in FIG.

FIG. 15 is a vertical cross-sectional view as seen from the arrow XV-XV direction in FIG.

16 is a vertical cross-sectional view as seen from the direction of arrow XVI-XVI in FIG.

[Explanation of symbols]

 1 Fixed scroll 2 End plate 2A Teeth bottom surface 3 Lap part 5 Orbiting scroll 6 End plate 6A Teeth bottom surface 7 Lap part 11 Compression chamber 21, 31, 41 Inner peripheral thin part 22, 32, 42 Outer peripheral thin part

Claims (1)

[Claims] 1. A fixed scroll in which a spiral wrap portion is erected on a tooth bottom surface of an end plate, and a plurality of compression chambers are provided between the fixed scroll and the fixed scroll so as to face the fixed scroll. In a scroll type fluid machine consisting of an orbiting scroll in which a spiral wrap portion is erected on the tooth bottom surface of the end plate so as to form, at least one of the wrap portions of the fixed scroll and the orbiting scroll,
A scroll type fluid machine characterized in that a thin portion having a thickness on a tooth tip side smaller than a thickness on a tooth bottom side is formed at one or a plurality of locations in a spiral direction of the wrap portion.