JPH08100776A - Scroll type fluid machine - Google Patents

Abstract

PURPOSE: To improve sealing property by floating a seal member positioned on the outer peripheral side of a fixed scroll and a turn scroll in such a manner that it comes into slide-contact with a bottom face of a tooth of a counterpart. CONSTITUTION: An elastic pipe 37(44) is provided between a bottom face 31A (38A) of a groove 31(38) formed in a lap section 3(11) and a seal member 33(40). The seal member 33(40) is pushed up toward a bottom face 10A(2A) of a tooth of a counterpart by each elastic pipe 37(44) and pressed so that an upper side face 33B(40B) of the seal member 33(40) is in slide-contact with the bottom face 10A(2A) of the tooth of the counterpart at all times. Consequently, even if pressure sufficient for floating the seal member 33(40) is not obtained on the outer peripheral side of a fixed scroll and a turn scroll, it is possible to float the seal member 33(40) due to elastic force of each elastic pipe 37(44) in such a manner that it comes into slide-contact with the bottom face 10A(2A) of the tooth of the counterpart securely to provide seal action securely.

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 As a prior art, for example, the actual Kaihei 3-11
A scroll type fluid machine described in Japanese Patent No. 101 is known. Here, an air compressor as a scroll fluid machine will be described with reference to FIGS. 9 to 12.

In the figure, reference numeral 1 denotes a fixed scroll which is a part of a casing of the scroll type air compressor,
The fixed scroll 1 covers an opening end side of a casing body (not shown) formed in a substantially closed cylindrical shape,
It is fixed to the opening end side. The center of the fixed scroll 1 is the axis O1- of the drive shaft 17, which will be described later.
A disc-shaped end plate 2 disposed so as to coincide with O1, and a spiral wrap portion 3 erected on a tooth bottom surface 2A of the end plate 2
And a supporting 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, as shown in FIG. 10, the wrap portion 3 of the fixed scroll 1 has a winding start end on the inner peripheral side and a winding end end on the outer peripheral side (not shown). It is formed in a spiral shape. Then, the tooth tip 3 of the wrap portion 3
As shown in FIG. 11, A is an orbiting scroll 9 described later.
It is separated from the tooth bottom surface 10A with a minute clearance C.

Reference numeral 5 denotes a concave groove formed on the tooth tip 3A side of the lap portion 3. The concave groove 5 is, as shown in FIG.
Is formed at a middle portion in the width direction and has a substantially U-shaped cross section, and has a bottom surface 5A and left and right side surfaces 5B, 5
C extends from the winding start end to the winding end end along the spiral shape of the wrap portion 3. A seal member 6 to be described later is mounted in the concave groove 5 so as to seal a gap between a tooth bottom surface 10A of the orbiting scroll 9 as a counterpart.

Reference numeral 6 denotes a seal member mounted in the concave groove 5 of the wrap portion 3. The seal member 6 is an elastic resin material having excellent wear resistance and slidability, such as polytetrafluoroethylene (PTFE). Fluorine resin, polyether sulfone (PES), polyphenylene sulfide (PP)
S), polyetheretherketone (PEEK), liquid crystal polymer (LCP), polysulfone (PSF), etc., is formed as a long chip seal having a quadrangular cross section, and is formed in the longitudinal direction of the groove 5. Along the spiral.

Here, as shown in FIG. 11, the sealing member 6 has a lower side surface 6A as a pressure receiving surface which is placed on the bottom surface 5A of the concave groove 5, and a lower side surface 6A which opposes the lower side surface 6A in the vertical direction. An upper side surface 6B that is in sliding contact with the tooth bottom surface 10A, and an inner side surface 6 located inside and outside in the radial direction of the spiral seal member 6
Each of the lower side face 6A and the inner side face 6C is integrally formed with a lower lip portion 7 and an inner lip portion 8 described later. Then, the seal member 6
Is placed so that the lower side surface 6A is placed on the bottom surface 5A of the recessed groove 5, and the outer side surfaces 6C and 6D are inserted into the recessed groove 5 with a slight gap so that the bottom surface 5A of the recessed groove 5 becomes the counterpart. The orbiting scroll 9 can float toward the tooth bottom surface 10A.

.. are lower lip portions formed on the lower surface 6A of the seal member 6 at predetermined intervals in the longitudinal direction, and each lower lip portion 7 is, as shown in FIG. The lower surface 6A of the seal member 6 is formed by obliquely cutting at a predetermined interval. Then, each of the lower lip portions 7 is integrated with the seal member 6, and the front end side becomes a free end, and the lower side surface 6A of the seal member 6 is formed.
It is designed to expand from.

.. indicate inner lip portions formed on the inner surface 6C of the seal member 6 at predetermined intervals in the longitudinal direction, and each inner lip portion 8 is substantially the same as the lower lip portion 7. In addition, the inner surface 6C of the seal member 6 is integrally formed with the seal member 6 by obliquely cutting the inner surface 6C at a predetermined interval, and the tip side becomes a free end and spreads from the inner surface 6C of the seal member 6. ing.

Reference numeral 9 denotes an orbiting scroll which is provided so as to be able to orbit in the casing body so as to face the fixed scroll 1, and the orbiting scroll 9 has a disk-shaped end plate 10 having a tooth bottom surface 10A on the front surface side. And a wrap portion 11 that is erected from the tooth bottom surface 10A of the end plate 10 toward the end plate 2 of the fixed scroll 1 and is formed in a spiral shape like the wrap portion 3 of the fixed scroll 1, and the back side of the end plate 10. And a boss portion 12 provided at the center of the boss portion 12.
Is rotatably attached to a crank 17A of a drive shaft 17 described later.

Here, the wrap portion 1 of the orbiting scroll 9
As shown in FIG. 10, the No. 1 is formed in a spiral shape, for example, three and a half turns before and after, like the wrap portion 3 of the fixed scroll 1. The tooth top 11A side has a bottom surface 13A and left and right side surfaces 13B. , 13C to a concave groove 13 having a U-shaped cross section
Are formed.

Reference numeral 14 denotes another seal member mounted in the groove 13, and the seal member 14 is formed in the same manner as the seal member 6 on the side of the fixed scroll 1 and mounted on the bottom surface 13A of the groove 13. Lower surface 14A as a pressure receiving surface to be placed
An upper side surface 14B that vertically opposes the lower side surface 14A and is in sliding contact with the tooth bottom surface 2A of the other side, and an inner side surface 14 located inside and outside the spiral sealing member 14 in the radial direction.
C and the outer side surface 14D. Also, a plurality of lower lip portions 15, 15, ... Are integrally formed on the lower side surface 14A of the seal member 14 as in the seal member 6, and a plurality of inner lip portions 16, 15 are formed on the inner side surface 14C.
16, ... Are integrally formed.

Reference numeral 17 denotes a drive shaft rotatably provided in the casing body. The drive shaft 17 is a crank 17A having a tip end side extending into the casing body. The crank 17A has an axis O2 -O2 of its axis. O1 −
It is eccentric by a predetermined dimension δ with respect to O1. The boss 12 of the orbiting scroll 9 is rotatably attached to the crank 17A of the drive shaft 17 via an orbiting bearing 18, and the orbiting scroll 9 is orbitally moved via a rotation preventing mechanism (not shown) or the like. Is given.

Here, the wrap portion 11 of the orbiting scroll 9
Are arranged so as to be overlapped with each other while being offset by a predetermined angle in the circumferential direction with respect to the wrap portion 3 of the fixed scroll 1.
, A plurality of crescent-shaped compression chambers R, R, ... Are defined between the wrap portions 3, 11. When the orbiting scroll 9 is orbited with respect to the fixed scroll 1, the volume of each compression chamber R is continuously reduced, and the air sucked from a suction port 19 described later is compressed. .

Reference numerals 19 and 20 denote a suction port and a discharge port formed in the fixed scroll 1, and the suction port 19 is connected to the compression chamber R on the outermost compression chamber side so as to communicate with the end plate 2.
The discharge port 20 is formed in the center of the end plate 2 so as to communicate with the innermost compression chamber R.

In the scroll type air compressor of the prior art constructed as described above, first, when the drive shaft 17 is rotationally driven from the outside of the casing by a drive source (not shown) such as a motor, this rotation causes the drive shaft 17 to rotate. From the crank 17A of 17 to the orbiting scroll 9 via the orbiting bearing 18,
The orbiting scroll 9 makes an orbiting motion having an orbiting radius of dimension δ about the axis O1 -O1 of the drive shaft 17.

The compression chambers R, R, ... Defined between the lap portions 3, 11 by this swiveling motion continuously shrink toward the center side, and the air sucked in through the suction port 19 is sequentially compressed. While compressed, the compressed air is discharged from the discharge port 20 toward an external air tank (not shown) or the like.

Here, when the compression operation is started, a part of the compressed air from the high pressure side compression chamber R in the direction of the arrow A shown in FIG. When entering, the seal members 6 and 14 receive the pressure of the compressed air on the lower side surfaces 6A and 14A serving as pressure receiving surfaces, whereby the concave grooves 5 and 1 are formed.
End plates 2 and 1 that float from the bottom surfaces 5A and 13A of
0 is pressed toward the tooth bottom surfaces 2A and 10A. As a result, the upper side surfaces 6B and 14B of the seal members 6 and 14 are brought into sliding contact with the tooth bottom surfaces 10A and 2A of the other side, and the compression chambers R defined between the lap portions 3 and 11 are hermetically sealed.

Further, each of the lower lip portions 7 (15) includes a compression chamber R on the inner peripheral side to a compression chamber R on the outer peripheral side of each compression chamber R.
The compressed air that has entered into the groove 5 (13) in the direction of arrow B in FIG. 10 causes the tip side of each lower lip portion 7 (15) to move toward the bottom surface 5 A (13 A) of the groove 5 (13). ), The bottom surface 5A (13) of the groove 5 (13)
An airtight seal is provided between A) and the seal member 6 (14).

Similarly, in each inner lip portion 8 (16), the tip side of each inner lip portion 8 (16) has a concave groove 5 (13) due to the compressed air that has entered the concave groove 5 (13). It comes to be pressed against one side surface 5B (13B), and the side surface 5B (13B) of the groove 5 (13) and the seal member 6 (1
4) airtightly seals between the sealing member 6 and
The outer surface 6D (14D) of (14) is replaced with the other side surface 5C (1
3C) to make an airtight seal between the two.

[0021]

By the way, in the above-mentioned prior art, the seal members 6 and 14 mounted in the concave grooves 5 and 13 of the wrap portions 3 and 11 are compressed by the compressed air from the compression chambers R. The seal action is obtained by floating and making sliding contact with the tooth bottom surfaces 10A and 2A of the other party.

However, the pressure of the compressed air in each compression chamber R may not be sufficiently increased, so that the seal members 6 and 14 do not float sufficiently in places, and the upper side surfaces 6B and 14B are not.
Sometimes does not surely come into sliding contact with the tooth bottom surfaces 10A, 2A of the other party, and there is a problem that the sealing performance cannot be improved.

That is, in the compression chamber R on the center side of the fixed scroll 1 and the orbiting scroll 9, the compressed air has the highest pressure, so that the seal member reliably floats by the pressure of the high-pressure compressed air. However, in the compression chamber R on the outer peripheral side of the fixed scroll 1 and the orbiting scroll 9, the compressed air has a low pressure, and there is no large difference with the atmospheric pressure, especially in the vicinity of the suction port 19, so the pressure required to float the seal member is increased. Can't get As a result, the seal members 6 and 14 may not surely float toward the tooth bottom surfaces 10A and 2A of the other party, which causes a problem of poor sealing performance.

When the pressure in each compression chamber R is not sufficiently increased as immediately after the compression operation is started,
Since the seal members 6 and 14 do not reliably float toward the tooth bottom surfaces 10A and 2A of the other party, there is a problem that the sealing action is not exhibited for a while after the compression operation is started.

The present invention has been made in view of the above-described problems of the prior art, and provides a scroll type fluid machine in which a seal member can surely bring a mating member into sliding contact with the tooth bottom surface and improve sealing performance. The purpose is to do.

[0026]

In order to solve the above-mentioned problems, a scroll type fluid machine according to the present invention includes a fixed scroll in which a spiral wrap portion is erected on the tooth bottom surface of an end plate and a fixed scroll. A fixed scroll, wherein a spiral wrap portion is provided upright on the tooth bottom surface of the end plate so as to define a plurality of compression chambers between the fixed scroll and the fixed scroll. At least one of the wrap portions of the orbiting scroll and the orbiting scroll is provided with a groove on the tooth top surface of the wrap portion, and a seal member that is in sliding contact with the tooth bottom surface of the other side is mounted in the groove. The following configuration is adopted.

The features of the configuration adopted by the present invention are as follows.
Between the seal member and the bottom surface of the groove, an auxiliary elastic member formed of an elastic material is disposed so as to extend in the spiral direction of the wrap portion, and the auxiliary elastic member is used to The seal member is configured to be elastically pressed from the concave groove toward the tooth bottom surface of the other party.

[0028]

With the above structure, the auxiliary elastic member elastically constantly presses the seal member from the groove toward the mating tooth bottom surface, so that the seal member is floated from the groove to the mating tooth bottom surface. Even if the pressure of the compressed fluid required for the above cannot be sufficiently increased, the sealing member can be levitated by the elastic force of the auxiliary elastic member, and the sealing member can be surely brought into sliding contact with the tooth bottom surface of the other party. The sealability of the seal member can be reliably exhibited.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the embodiment, the same components as those of the conventional technique shown in FIGS. 9 to 12 described above are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, reference numeral 31 denotes a groove formed on the tooth top 3A of the wrap portion 3 provided on the fixed scroll 1. The groove 31 is located at the widthwise intermediate portion of the wrap portion 3 and traverses it. The surface is formed in a substantially U shape, and the bottom surface 31A and the left and right side surfaces 31B, 31C extend from the winding start end to the winding end end along the spiral shape of the wrap portion 3.
A seal member 33, which will be described later, is mounted in the groove 31, and the tooth bottom surface 10A of the orbiting scroll 9, which is the counterpart, is mounted.
It is designed to seal between and.

These points are the same as those of the conventional groove 5, but the bottom surface 3 of the groove 31 of this embodiment is the same.
1A has a plurality of long grooves 32, 32 for positioning and mounting elastic tubes 37, 37, ... And
Each of the long grooves 32 is formed at an intermediate portion in the width direction of the bottom surface 31A, and the long grooves 32, 32, ... Are provided along the spiral direction of the wrap portion 3 as shown in FIG. It is formed so as to extend with a length dimension, and is formed at a plurality of positions in the spiral direction of the wrap portion 3 with a predetermined distance therebetween.

The plurality of long grooves 32, 32, ...
Concave groove 31 formed on substantially the entire circumference of the wrap portion 3 in the spiral direction
Of these, it is formed only on the bottom surface 31A of the concave groove 31 located between the winding end on the outer peripheral side of the lap portion 3 and, for example, about one winding.

Reference numeral 33 denotes a seal member mounted in the groove 31. The seal member 33 is substantially the same as the seal member 6 described in the prior art, and is made of an elastic resin material excellent in wear resistance and slidability. , For example, polytetrafluoroethylene (PTF
Fluorine resin such as E), polyether sulfone (PE
S), polyphenylene sulfide (PPS), polyether ether ketone (PEEK), liquid crystal polymer (L
CP) or polysulfone (PSF) or the like, which is formed as a long chip seal having a rectangular cross section and extends spirally along the longitudinal direction of the concave groove 31.

Further, the sealing member 33, like the sealing member 6 described in the prior art, has a lower side surface 33 as a pressure receiving surface.
A and an upper side surface 33B which is in sliding contact with the tooth bottom surface 10A of the other side.
And an inner side surface 33C and an outer side surface 33D,
It is mounted in the recessed groove 31 so as to be able to float toward the tooth bottom surface 10A of the orbiting scroll 9 which is the other party.

Further, the sealing member 33 is similar to the sealing member 6 according to the prior art, and the lower side surface 33A has lower lip portions 34, 3 at predetermined intervals in the longitudinal direction.
4 are formed on the inner side surface 33C, and the inner lip portions 35, 35, 35,
... are formed. Then, each of the lower lip portions 3
4. Each of the inner lip portions 35 is integrated with the seal member 33, and the tip end side of the inner lip portion 35 becomes a free end and spreads from the lower side surface 33A and the inner side surface 33B of the seal member 33.

Further, a plurality of long grooves 36, 36, ... For positioning and mounting the elastic tube bodies 37, 37, ... Are formed on the lower side surface 33A of the seal member 33 according to this embodiment. Each of the long grooves 36 is formed at the middle portion of the lower side surface 33A in the width direction, and the long grooves 36, 3 are formed.
2, 6, ... Are formed by extending along a spiral direction of the seal member 33 with a predetermined length dimension,
In addition, the seal member 33 is formed at a plurality of positions in the spiral direction with a predetermined interval.

Furthermore, the lower surface 33 of the seal member 33
As described above, the lower lip portions 34, 34, ... Are formed in A at predetermined intervals in the longitudinal direction, but the long grooves 36, 3 of the lower side surface 33A of the seal member 33 are formed.
6, the arrangement interval of the lower lip portions 34 is set so that at least one lower lip portion 34 is formed in a portion where the long groove 36 is not formed. .

The plurality of long grooves 36, 36, ...
Of the seal member 33 extending over substantially the entire circumference of the wrap portion 3 in the spiral direction, only the lower surface 33A of the seal member 33 located between the winding end end on the outer peripheral side of the wrap portion 3 and, for example, about 1 roll. Has been formed.

Denoted by 37, 37, ... are elastic tube bodies provided as a plurality of auxiliary elastic members arranged in the concave groove 31, and each elastic tube body 37 is, for example, polytetrafluoroethylene (PTF).
Fluorine resin such as E), polyether sulfone (PE
S), polyphenylene sulfide (PPS), polyether ether ketone (PEEK), liquid crystal polymer (L
It is formed of an elastic resin material such as CP) or polysulfone (PSF) as a long cylinder having a predetermined length dimension. Further, since each elastic tubular body 37 is formed in a thin tubular shape as shown in FIG. 1, the sealing member 33 is pushed up in the direction of the arrow D with a flexible elastic force.
The upper side surface 33B of the seal member 33 is the tooth bottom surface 10A of the other side.
It is elastically pressed so that it always comes into sliding contact with.

Each elastic tube 37 is located between the bottom surface 31A of the concave groove 31 and the seal member 33, and the long groove 32 formed on the bottom surface 31A of the concave groove 31 and the lower surface of the seal member 33. The upper side and the lower side are attached to the long groove 36 formed in 33A, respectively. As a result, each elastic tube 37
Is positioned in the middle portion of the bottom surface 31A of the groove 31 in the width direction, and is also supported so as not to be displaced in the spiral direction.

Further, each elastic tube 37 is provided with a wrap portion 3.
Among the recessed grooves 31 formed on substantially the entire circumference in the spiral direction, the recessed groove 31 is provided only in the recessed groove 31 located between the winding end end on the outer peripheral side of the wrap portion 3 and, for example, about one winding.

Reference numeral 38 indicates a groove formed on the tooth top surface 11A of the wrap portion 11 provided on the orbiting scroll 9, and the groove 38 is a groove 31 formed on the wrap portion 3 of the fixed scroll 1. The bottom surface 38A and the left and right side surfaces 38B and 38C extend substantially in the same manner as the above from the winding start end to the winding end end along the spiral shape of the wrap portion 11. The bottom surface 38A of the groove 38 has the groove 31
A plurality of long grooves 39, 39, ... Are formed in the same manner as the long groove 32 formed on the bottom surface 31A.

Reference numeral 40 denotes a seal member mounted in the concave groove 38. The seal member 40 is formed in substantially the same manner as the seal member 33 mounted in the concave groove 31 on the fixed scroll 1 side, and has a lower surface. 40A, upper surface 40B, inner surface 40C
And an outer surface 40D. Further, similar to the seal member 33, the seal member 40 has lower lip portions 41, 41, ...
Inner lip portions 42, 42, ... Are formed at 0C, respectively. In addition, the lower surface 40A of the seal member 40 has a plurality of long grooves 43, 4 in the same volume as the seal member 33.
3,... Are formed.

Reference numerals 44, 44, ... Represent elastic pipes as auxiliary elastic members arranged in the groove 38, and each elastic pipe 37 is arranged in the groove 31 on the fixed scroll 1 side. Similar to each elastic tube body 37 provided, it is formed of an elastic resin material as a long cylinder having a predetermined length dimension. Further, since each elastic tube body 44 is formed in a thin tubular shape as shown in FIG.
Is pushed up in the direction of the arrow D with a flexible elastic force, and the upper side surface 40B of the seal member 40 is elastically pressed so as to always be in sliding contact with the tooth bottom surface 2A of the opponent.

Further, each elastic tube body 44 is located between the bottom surface 38A of the concave groove 38 and the seal member 33, and the concave groove 38 is formed.
The long groove 39 formed on the bottom surface 38A of the
The upper side and the lower side are respectively attached to the long groove 43 formed in the lower side surface 40A. As a result, each elastic tube body 4
No. 4 is positioned at the middle portion of the bottom surface 38A of the groove 38 in the width direction, and is also supported so as not to be displaced in the spiral direction.

Further, each elastic tube body 44, like the elastic tube body 37 on the fixed scroll 1 side, is a wrap of the concave groove 38 formed in the spiral direction of the lap portion 11 almost all around. It is provided only in the concave groove 38 located between the winding end end on the outer peripheral side of the portion 11 and, for example, about one winding.

The scroll type air compressor according to the present embodiment has the above-mentioned structure, and there is no particular difference in the basic compression operation from that of the prior art.

However, in this embodiment, the concave groove 31 (38) is used.
The elastic tube bodies 37 (44), 37 (44), ... Are arranged between the bottom surface 31A (38A) and the seal member 33 (40), and the seal member 33 is formed by each elastic tube body 37 (44).
(40) is pushed up toward the tooth bottom surface 10A (2A) of the other party, and the upper side surface 33B (40) of the seal member 33 (40).
Since B) is configured to elastically press so as to always come into sliding contact with the tooth bottom surface 10A (2A) of the other party, the concave groove 31 (3
8) Even if the pressure of the compressed air required for floating the seal member 33 (40) from the inside to the tooth bottom surface 10A (2A) of the other party is not sufficiently increased, each elastic tube 37 (4)
By the elastic force of 4), the upper side surface 33B (40B) of the seal member 33 (40) can surely be brought into sliding contact with the mating tooth bottom surface 10A (2A).

For example, in the compression chamber R on the outer peripheral side of the fixed scroll 1 and the orbiting scroll 9, the compressed air has a low pressure, and there is no large difference with the atmospheric pressure particularly near the suction port 19, so the seal member 33 (40) is used. It may not be possible to obtain the pressure required to levitate. However, even in this case, the elastic member 37 (44) elastically presses the seal member 33 (40) against the tooth bottom surface 10 of the other side.
It can be reliably floated toward A (2A), and the sealing property can be reliably exhibited.

Even when the pressure in each compression chamber R is not sufficiently increased as immediately after the compression operation is started,
The elastic pressing force of each elastic tube 37 (44) causes the seal member 33 (40) to move to the tooth bottom surface 10A (2
It can be reliably floated toward A), and the sealing action of the seal member 33 (40) can be reliably exhibited immediately after the start of the compression operation.

Further, according to this embodiment, each elastic tube 37 is
(44) is a portion of the groove 31 (38) formed in substantially the entire circumference of the wrap portion 3 (11) in the spiral direction.
1) Since it is arranged only in the concave groove 31 (38) located between the end of the winding on the outer peripheral side and, for example, about one winding, the seal member 33 (4) on the outer peripheral side where the pressure of the compressed air is relatively low.
Only 0) can be pushed up toward the other tooth bottom surface 10A (2A).

That is, even if the elastic tubes 37 (44) are not provided at the center side of the fixed scroll 1 and the orbiting scroll 9 where the pressure of the compressed air becomes relatively high, the seal member 33 is not provided.
(40) floats toward the tooth bottom surface 10A (2A) of the other party. Further, when the elastic tubes 37 (44) are provided on the center side of the fixed scroll 1 and the orbiting scroll 9, the pressing force for pushing the seal member 33 (40) toward the mating tooth bottom surface 10A (2A) becomes excessive. On the contrary, troubles such as an increase in the load of the drive source that causes the orbiting scroll 9 to orbit and prevent the seal member 33 (40) from sliding on the tooth bottom surface 10A (2A), and the seal member 33 (40) are worn or damaged. May occur. Therefore, each elastic tube 37
By disposing (44) only on the outer peripheral side of the wrap portion 3, such a problem can be prevented.

Further, according to this embodiment, as shown in FIG. 2, the lower side surface 33A (40) of the seal member 33 (40).
At least one lower lip portion 34 (41) is formed in a portion of A) located between the long grooves 36 (43) and 36 (43) and where the long groove 36 (43) is not formed. Therefore, the bottom surface 31A (38A) of the groove 31 (38) and the seal member 33 are formed by the lower lip portion 34 (41).
(40) can be airtightly sealed, and groove 31 (38)
It is possible to reliably prevent the compressed air from leaking through the inside.

Thus, according to this embodiment, the concave groove 31
Bottom surface 31A (38A) of (38) and seal member 33 (4
0), the elastic tubes 37 (44) are arranged between the fixed scroll 1 and the orbiting scroll 9 so that the compressed air in each compression chamber R has a low pressure. Even if the pressure of is relatively low, the seal member 33 (40) is surely pushed up toward the mating tooth bottom surface 10A (2A), and the sealing member 33 (40) is always stabilized at the mating tooth bottom surface 10A (2A). It is possible to make sliding contact.

Therefore, the sealing action of the seal member 33 (40) can be surely exerted over the entire circumference of the fixed scroll 1 and the orbiting scroll 9, and the compressed air in each compression chamber R is fixed scroll 1, orbiting. It is possible to reliably prevent leakage from the center side of the scroll 9 toward the outer peripheral side, and to significantly improve the compression performance.

Further, since the sealing action of the seal member 33 (40) can be exerted immediately after starting the compression operation, the compression action of the scroll type compressor can be stabilized early after the start of operation, The compression efficiency can be greatly improved.

Further, according to the present embodiment, since the seal member 33 (40) is pushed up by the elastic tube bodies 37 (44) so as to always be in sliding contact with the tooth bottom surface of the other party, the lap portion 3 (11). The tolerance of the upper side surface 33B (40B) of the seal member 33 (40) located on the outer peripheral side of (1) is allowed to be relatively rough, and manufacturing and designing can be facilitated.

In the above embodiment, the elastic tube bodies 37 (44) formed in the shape of a cylindrical tube are provided as the auxiliary elastic members, but the present invention is not limited to this, and FIG. The auxiliary elastic member 51 having an oval tubular cross section as shown or the auxiliary elastic member 61 having a rectangular tubular cross section as shown in FIG. 4 may be used.

Further, the auxiliary elastic member according to the present invention is not limited to the tubular shape, and any shape can be used as long as it can elastically push up the seal member 33 (40) toward the tooth bottom surface 10A (2A) of the other party. Cross section "U" as shown in Fig. 5
A character-shaped auxiliary elastic member 71, a cross-sectional "Y" -shaped auxiliary elastic member 81 shown in FIG. 6, a cross-sectional "I" -shaped auxiliary elastic member 91 shown in FIG. 7, or FIG. Other shapes such as the auxiliary elastic member 101 having a cross-section "X" shape may be used.

In the above embodiment, each elastic tube 37 is
(44) of the concave grooves 31 (38) formed in substantially the entire circumference of the wrap portion 3 (11) in the spiral direction, the lap portion 3 (1
1) It has been described that the groove is provided only in the concave groove 31 (38) located between the end of winding on the outer peripheral side and about one winding.
The present invention is not limited to this, and from the winding end on the outer peripheral side of the wrap portion 3 (11) to about half a winding, from the winding end on the outer peripheral side of the lap portion 3 (11) to about one and a half windings, and the like. Alternatively, the elastic tube bodies 37 (44) may be arranged over the entire circumference of the lap portion 3 (11).

Furthermore, in each of the above embodiments, the seal member 33 is mounted in the concave groove 31 on the fixed scroll 1 side, and the seal member 40 is mounted in the concave groove 38 on the orbiting scroll 9 side. The invention is not limited to this, and a recessed groove may be formed in either one of the fixed scroll 1 side or the orbiting scroll 9 side and a seal member may be mounted in the recessed groove.

Furthermore, 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 in detail above, according to the present invention, between the seal member and the bottom surface of the concave groove, an auxiliary elastic member formed in a long length by an elastic material is provided in the spiral direction of the wrap portion. Since the auxiliary elastic member elastically presses the sealing member from the groove toward the mating tooth bottom surface, the sealing member is pushed from the inside of the groove to the mating tooth bottom surface. Even if the pressure of the compressed fluid required to raise the surface is not sufficiently increased, the sealing member is levitated by the elastic force of the auxiliary elastic member, and the sealing member is surely brought into sliding contact with the tooth bottom surface of the other side. Can be made. In particular, the seal member located on the outer peripheral side of the fixed scroll or the orbiting scroll in which the pressure of the compressed fluid is unlikely to rise can be floated so as to surely make sliding contact with the tooth bottom surface of the other party. Therefore, the sealing action of the sealing member can be reliably exerted, the sealing performance can be stabilized, and the compression performance can be greatly improved.

[Brief description of drawings]

FIG. 1 is a sectional view similar to FIG. 11, showing a groove, a seal member, an elastic tube body, and the like of a scroll air compressor according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a perspective view showing an auxiliary elastic member having a tubular elliptical cross section according to the present invention.

FIG. 4 is a perspective view showing an auxiliary elastic member having a rectangular cross section according to the present invention.

FIG. 5 is a perspective view showing an auxiliary elastic member having a U-shaped cross section according to the present invention.

FIG. 6 is a perspective view showing an auxiliary elastic member having a “Y” -shaped cross section according to the present invention.

FIG. 7 is a perspective view showing an auxiliary elastic member having a “I” -shaped cross section according to the present invention.

FIG. 8 is a perspective view showing an auxiliary elastic member having a cross-section “X” shape according to the present invention.

FIG. 9 is a vertical cross-sectional view showing a fixed scroll, an orbiting scroll, each seal member, and the like of a scroll air compressor according to a conventional technique.

10 is an enlarged cross-sectional view taken along arrow XX in FIG.

11 is an enlarged cross-sectional view taken along arrow XI-XI in FIG.

FIG. 12 is an enlarged perspective view showing a seal member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed scroll 2,10 End plate 2A, 10A Teeth bottom surface 3,11 Lap part 9 Orbiting scroll 31,38 Recessed groove 33,40 Seal member 37,44 Elastic tube body (auxiliary elastic member) 51, 61, 71, 81, 91 , 101 Auxiliary elastic member

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 fixed scrolls provided on the end surface of an end plate of the end plate and a wrap portion of the fixed scroll. And a revolving scroll in which a spiral wrap portion is erected so as to define a compression chamber of the revolving scroll, and at least one of the revolving scroll and the fixed scroll has a tooth of the wrap portion. In a scroll type fluid machine in which a groove extending along the tip is formed, and a seal member that is in sliding contact with the tooth bottom surface of the other side is installed in the groove, between the seal member and the bottom surface of the groove. Is an elastic member formed of an elastic material and arranged so as to extend in the spiral direction of the wrap portion, and the auxiliary elastic member causes the sealing member to elastically move from the concave groove to the tooth bottom surface of the other side. Press A scroll type fluid machine characterized by having the above structure.