JP2000045964A - Scroll hydraulic machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve sealing performance of the compression chamber by providing a seal ring which rotates between the easing and the rotational scroll. SOLUTION: In a casing 2, a rotational scroll 8 is provided opposing to a fixed scroll 4. This rotational scroll 8 is rotated by a driving shaft 5 or the like. Between the casing 2 and the rotational scroll 8, a seal ring 16 is disposed, of which the inner periphery is offset respective to the outer periphery. When the rotational scroll 8 is in rotational motion, the seal ring 16 is rotated in the casing 2, while it is relatively moved in the outer periphery side of the rotational scroll 8. As a result, lubricant 3 in a easing 1 is prevented from entering any compression space 9 between an overlapping part between 4D and 8B.

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, a compressor for compressing air, refrigerant, or the like, a vacuum pump, or the like.

[0002]

2. Description of the Related Art Generally, a scroll type fluid machine is provided with a fixed member comprising a cylindrical casing and a fixed scroll provided at an end portion of the casing, a rotatable member provided inside the casing, and a fixed end provided at the fixed end. A drive shaft that extends in the axial direction toward the scroll, and is provided so as to be pivotable at the tip end side of the drive shaft, and fluid that is sucked from the suction port when orbiting in the fixed member is moved between the drive shaft and the fixed scroll. And a substantially disk-shaped orbiting scroll that is compressed and discharged from the discharge port.

In this type of scroll fluid machine according to the prior art, a cylindrical casing surrounds a drive shaft and extends in an axial direction. A bearing portion rotatably supporting the drive shaft and a revolving portion are provided in the casing. An annular thrust receiving portion is provided to protrude radially inward from the peripheral wall of the casing toward the drive shaft to rotatably support the scroll.

[0004] The fixed scroll is provided on a disk-shaped end plate for closing an end portion of the casing, a spiral wrap portion erected from the end plate toward the inside of the casing, and provided on an outer peripheral side of the end plate. , And a flange attached to the casing.

Further, the orbiting scroll is provided between a disc-shaped end plate disposed between a thrust receiving portion of the casing and the fixed scroll, and a wrap portion of the fixed scroll standing upright on the front side of the end plate. It consists of a spiral wrap that defines a plurality of compression chambers. The back side of the head plate is connected to the drive shaft via a bearing at the center, and the outer side is slidable by the thrust receiving part of the casing. It is supported by.

Here, an annular face seal made of an elastic material or the like is provided between the end plate of the orbiting scroll and the flange portion of the fixed scroll.
For example, it is mounted in a seal groove provided in a flange portion, and is in elastic sliding contact with the outer periphery of the spiral plate (front side) of the end plate of the orbiting scroll. Thereby, the face seal prevents the lubricating oil supplied to the bearing portion and the like in the casing from flowing from the back side to the front side of the orbiting scroll when the orbiting scroll makes a revolving motion, and each of the compression chambers on the front side. Is sealed from a lubricating oil or the like.

When a scroll type fluid machine is used as an air compressor, for example, when the drive shaft is driven to rotate by an electric motor or the like, the orbiting scroll performs a orbiting motion with respect to the fixed scroll, so that the orbiting scroll moves from the suction port. The compressed air is discharged from the discharge port to an external air tank or the like while compressing the sucked air in each compression chamber.

[0008]

In the above-mentioned prior art, a face seal is provided between the flange portion of the fixed scroll and the spiral side of the orbiting scroll. Each compression chamber on the scroll front side is sealed from lubricating oil or the like in the casing.

However, when the orbiting scroll orbits, the sliding position of the face seal with respect to the end plate also moves relatively in accordance with the orbiting motion, so that the face seal is within a certain area range with respect to the orbiting scroll. It also slides in the radial direction.

[0010] For this reason, lubricating oil circling from the back side of the orbiting scroll is easily supplied to the sliding position of the face seal, and the face seal pushes the lubricating oil so as to scrape it in the radial direction. Since the seal between the orbiting scroll and the orbiting scroll must be sealed, even if the face seal is slightly worn, the sealing property between the two tends to deteriorate, and it is difficult to maintain high sealing performance for a long period of time. is there.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to stably seal a compression chamber defined between a fixed scroll and an orbiting scroll from a space in a casing. It is an object of the present invention to provide a scroll-type fluid machine that can surely prevent lubricating oil in a casing from entering a compression chamber and maintain high sealing performance for a long period of time.

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a fixing member comprising a cylindrical casing and a fixed scroll provided at an end of the casing, and a rotatable member inside the casing. A drive shaft having a distal end axially extending toward the fixed scroll; and a fixed scroll provided at the distal end of the drive shaft such that the fluid sucked from the suction port when orbiting within the fixed member is rotated. And a substantially disk-shaped orbiting scroll that compresses between and discharges from a discharge port.

[0013] The feature of the structure adopted by the first aspect of the present invention is that, between the fixed member and the orbiting scroll,
A ring-shaped rotator that is arranged on the outer peripheral side of the orbiting scroll and relatively rotates between the fixed member and the orbiting scroll when the orbiting scroll makes an orbiting motion; and extends circumferentially along the inner peripheral side of the rotator. A first seal that seals between the rotating body and the orbiting scroll; and a second seal that extends circumferentially along the outer peripheral side of the rotating body and seals between the rotating body and the fixed member.
The seal is provided.

With this configuration, when the orbiting scroll orbits in the fixed member, the rotating body can be relatively rotated on the outer peripheral side of the orbiting scroll while being rotated in the fixed member. At this time, the first seal can seal between the rotating body and the orbiting scroll, and the second seal can seal between the rotating body and the fixed member. As a result, the compression chambers located on the front side of the orbiting scroll and the space inside the casing located on the back side can be shut off using the rotating body and the first and second seals.

Further, in the invention according to claim 2, the rotating body has an outer diameter corresponding to a radial dimension of the fixed member and an inner diameter corresponding to an outer diameter dimension of the orbiting scroll. The center of the inner diameter is disposed eccentric with the center of the outer diameter by the turning radius of the orbiting scroll.

Thus, the radial gap formed between the inner peripheral side of the fixed member and the outer peripheral side of the orbiting scroll can be covered by the rotating body. When the orbiting scroll orbits, it rotates in this state. When the member is pushed by the orbiting scroll and relatively rotates between the fixed member and the orbiting scroll, the orbiting scroll can freely perform the orbiting motion.

Further, in the invention according to claim 3, the rotating body is formed of a seal ring formed of an elastic resin material, and the seal ring has elasticity over the entire outer circumference and the entire circumference of the orbiting scroll. And an annular inner lip portion slidingly contacting the first member and forming the first seal, and an annular outer lip portion elastically slidingly contacting the fixing member over the entire circumference and forming the second seal. .

Thus, the radial gap formed between the inner peripheral side of the fixed member and the outer peripheral side of the orbiting scroll can be covered by the seal ring. The outer lip can be slid with the fixing member while the lip is slid with the outer peripheral side of the orbiting scroll.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A scroll type fluid machine according to an embodiment of the present invention will be described below in detail with reference to FIGS.

FIGS. 1 to 6 show a first embodiment according to the present invention. In this embodiment, a scroll-type air compressor of a semi-lubricating type will be described as an example of a scroll-type fluid machine. .

Reference numeral 1 denotes a fixed member which forms an outer shell of the scroll type air compressor, and 2 denotes a substantially cylindrical casing which constitutes the fixed member 1 together with a fixed scroll 4 which will be described later.
Is a bearing portion 2A formed in a small-diameter cylindrical shape, and the bearing portion 2A
A large-diameter tube portion 2B extending in the axial direction while expanding in diameter, an annular thrust receiving portion 2C projecting radially inward from the distal end of the large-diameter cylindrical portion 2B, and a distal end of the large-diameter cylindrical portion 2B And protrudes in the axial direction from the outer peripheral side of the thrust receiving portion 2C, and includes an annular mounting projection 2D to which the fixed scroll 4 is mounted.

On the inner peripheral side of the mounting projection 2D, a circular concave portion is provided between the mounting convex portion 2D and the thrust receiving portion 2C, and the concave portion accommodates the end plate 8A of the orbiting scroll 8 in a rotatable manner. The end plate receiving recess 2E is provided. Further, the casing 2 contains a lubricating oil 3 for lubricating ball bearings 6 and 7 described later.

Reference numeral 4 denotes a bottomed cylindrical fixed scroll which constitutes a part of the fixed member 1. The fixed scroll 4 is formed in a substantially disk shape at a bottom portion thereof, and has an axis of a drive shaft 5 to be described later. A head plate 4A having a center substantially equal to O1 -O1;
A tubular portion 4B extending axially from the outer peripheral side of the end plate 4A toward the casing 2, an annular flange portion 4C extending radially outward from the tubular portion 4B, and a casing 2 extending from the end plate 4A.
, And a spiral wrap portion 4D that stands in the axial direction toward the, and the flange portion 4C is attached to the attachment projection 2D of the casing 2 using an attachment screw or the like.

Reference numeral 5 denotes a drive shaft rotatably supported by bearings 2A of the casing 2 via ball bearings 6 and 7. The drive shaft 5 has an electric motor (not shown) at its base end outside the casing 2. ), The distal end of which extends in the axial direction in the casing 2 toward the fixed scroll 4, and the distal end is a crankshaft 5A. And the crankshaft 5A
Has an axis O2-O2 which is eccentric by a predetermined dimension [epsilon] with respect to the axis O1-O1 of the drive shaft 5.

Reference numeral 8 denotes an orbiting scroll which is located in the casing 2 and is rotatably provided on the crankshaft 5A of the drive shaft 5. The orbiting scroll 8 includes an axis O2 of the crankshaft 5A.
A mirror plate 8A formed in a substantially disk shape with -O2 as a center,
A spiral wrap portion 8B standing in the axial direction from the front side of the end plate 8A facing the fixed scroll 4, and an end plate 8A
And a boss 8C protruding from the rear side of the boss.

Here, the end plate 8A is accommodated in the end plate accommodating recess 2E of the casing 2, and a radial gap is formed between the outer peripheral surface 8D and the casing 2. Further, the end plate 8A is disposed so that the front side faces the end plate 4A of the fixed scroll 4 in the axial direction, and the back side is slidable with the thrust receiving portion 2C. Furthermore, the wrap portion 8B is overlapped with a gap with the wrap portion 4D of the fixed scroll 4, and a plurality of compression chambers 9, 9,... Are defined between the wrap portions 4D, 8B.

A crankshaft 5A is rotatably connected to the boss 8C via a roller bearing 10. The orbiting scroll 8 is rotatably driven by the drive shaft 5 and makes an orbiting motion in the direction indicated by the arrow A in FIG.

Reference numeral 11 denotes an Oldham ring provided between the casing 2 and the orbiting scroll 8. The Oldham ring 11 prevents the orbiting scroll 8 from rotating when the orbiting scroll 8 is driven to rotate by the drive shaft 5. Scroll 8
To give a circular motion (turning motion) having a turning radius of the dimension ε by the crankshaft 5A.

Reference numeral 12 denotes a counterweight provided on the drive shaft 5 to maintain the rotational balance of the drive shaft 5, and 13 denotes an oil scraper attached to the counterweight 12, and the oil scraper 13 The oil 3 is scraped up and the ball bearings 6 and 7, the roller bearing 10, and the thrust receiving portion 2 of the casing 2
C and so on.

Reference numeral 14 denotes a suction port formed on the outer peripheral side of the end plate 4A of the fixed scroll 4, and the suction port 14 communicates with the compression chamber 9 on the outermost peripheral side. 15 is a fixed scroll 4
The discharge port formed in the center of the end plate 4A
5 is open to the innermost compression chamber 9.

A seal ring 16 is provided on the outer peripheral side of the orbiting scroll 8 as a rotating body.
As shown in FIGS. 1 to 4, 6 is formed using an elastic resin material having abrasion resistance such as, for example, fluoro rubber. The outer peripheral side of the seal ring 16 has a circular shape centered on the center O1 -O1 of the drive shaft 5, and has an outer diameter corresponding to the inner diameter of the end plate receiving recess 2E of the casing 2.

The inner peripheral side of the seal ring 16 is shown in FIG.
As shown in the figure, a circular insertion hole 16A having a hole diameter corresponding to the outer diameter of the end plate 8A of the orbiting scroll 8 is formed. The center of the insertion hole 16A is positioned with respect to the center O1-O1 of the drive shaft 5. The orbiting scroll 8 is disposed at a position eccentric by the turning radius (dimension ε). Thus, the seal ring 16 is formed of a narrow width portion 16B having a minimum width R1 in the radial direction and a wide width portion 16C having a maximum width R2 (R2> R1). The orbiting scroll 8 has a shape that covers a radial gap formed on the outer peripheral side of the end plate 8A of the orbiting scroll 8 within the end plate receiving recess 2E. Further, the seal ring 16 has a substantially U-shaped cross section by integrally forming a flat plate portion 17, an inner lip portion 19, and an outer lip portion 21 described later.

When the orbiting scroll 8 orbits in the direction indicated by the arrow A in FIG. 5, the seal ring 16 rotates in the direction indicated by the arrow B in the end plate accommodating recess 2E of the casing 2 while rotating in the direction indicated by the arrow B. To rotate relatively. At this time, in the seal ring 16, the flat plate portion 17 slides with the flange portion 4C of the fixed scroll 4, the inner lip portion 19 slides with the end plate 8A of the orbiting scroll 8, and the outer lip portion 21 holds the end plate housing of the casing 2. It slides in the recess 2E. Thereby, the seal ring 16 divides each compression chamber 9 into the casing 2.
It is configured to seal against the space inside.

17 is an inner lip 19 and an outer lip 2
1 and an annular flat plate provided between the flat plate 17 and the flat plate 17.
The front side is elastically slidably in contact with the flange portion 4C of the fixed scroll 4 over the entire circumference, and the core 18 made of an annular steel plate or the like is fixed to the rear side by means of bonding, baking or the like. . In this case, the core metal 18 also has a radial width dimension corresponding to the seal ring 16, and is formed with a narrow width portion and a wide width portion.

Reference numeral 19 denotes an annular inner lip provided on the inner peripheral side of the seal ring 16 as a first seal, and the inner lip 19 is, as shown in FIGS.
7 extends obliquely inward in the radial direction while projecting in the axial direction from the inner peripheral side, and the distal end side is in elastic contact with the outer peripheral surface 8D of the end plate 8A of the orbiting scroll 8 over the entire circumference. An annular coil spring 20 extending along the outer peripheral surface 8D of the end plate 8A is fixed to the outer peripheral side of the inner lip 19, and the coil spring 20 urges the inner lip 19 radially inward. With the inner lip 19 and the outer peripheral surface 8D of the end plate 8A.
Are held in a state of elastic sliding contact.

Reference numeral 21 denotes an annular outer lip provided as a second seal on the outer peripheral side of the seal ring 16. The outer lip 21 projects radially outward while projecting in the axial direction from the outer peripheral side of the flat plate portion 17. The front end side is elastically slidably in contact with the inner peripheral side of the end plate receiving recess 2E of the casing 2 over the entire periphery.

On the inner peripheral side of the outer lip portion 21, two leaf springs 22, 22 made of a substantially C-shaped steel plate or the like are fixed. In this state, the outer lip 21 is elastically slidably in contact with the end plate housing recess 2E. In this case, the leaf springs 22 are overlapped with each other so that notches (not shown) provided at one position in the circumferential direction are shifted by, for example, 180 °, and the urging force to the outer lip portion 21 is applied to the circumferential direction. Almost equalized.

The scroll type air compressor according to the present embodiment has the above-described configuration, and its operation will be described next.

First, when the drive shaft 5 is rotationally driven by an electric motor, when the orbiting scroll 8 makes a orbital motion with a orbital radius of the dimension ε, external air flows from the suction port 14 into the compression chamber 9 on the outermost peripheral side. Inhaled. This air is sequentially compressed in each compression chamber 9 to become compressed air, and is discharged from the innermost compression chamber 9 to an external air tank or the like via the discharge port 15. At this time, the lubricating oil 3 in the casing 2 is scraped up by an oil scraper 13 rotating together with the drive shaft 5, and lubricates the ball bearings 6, 7, the roller bearing 10, the thrust receiving portion 2C and the like.

On the other hand, the orbiting scroll 8 is shown in FIGS.
When the orbiting motion is performed in the direction of arrow A as shown in FIG. 5, the seal ring 16 is pushed by the orbiting scroll 8 and rotates in the direction of arrow B within the end plate receiving recess 2E of the casing 2,
At this time, the seal ring 16 also rotates relative to the orbiting scroll 8.

As a result, the seal ring 16 is
7 slides on the flange 4C of the fixed scroll 4, the inner lip 19 slides on the end plate 8A of the orbiting scroll 8, and the outer lip 21 slides in the end plate receiving recess 2E of the casing 2. As a result, each compression chamber 9 is held in a state of being isolated from the space in the casing 2 by the seal ring 16, and the lubricating oil 3 is prevented from entering the compression chamber 9 side.

Thus, in the present embodiment, the seal ring 16 is provided inside the casing 2 on the outer peripheral side of the orbiting scroll 8, and the inner lip portion 19 of the seal ring 16 is provided.
Is brought into sliding contact with the end plate 8A of the orbiting scroll 8, and the outer lip portion 21 is brought into sliding contact with the end plate accommodating recess 2E of the casing 2. Therefore, when the orbiting scroll 8 makes an orbital movement, the seal ring 16 is attached to the casing 2. It is possible to rotate the outer peripheral side of the orbiting scroll 8 relatively while rotating in the end plate housing recess 2E. Can be sealed.

In this case, the center of the insertion hole 16A is disposed at a position eccentric by the turning radius of the orbiting scroll 8 with respect to the center of the outer diameter of the seal ring 16.
The gap formed between the orbiting scroll 8 and the orbiting scroll 8 can be stably covered by the seal ring 16. When the orbiting scroll 8 makes orbital movement, the seal ring 16 is pushed by the orbiting scroll 8 to orbit with the casing 2. Relative rotation with the scroll 8 is possible.

As a result, the orbiting scroll 8 can be smoothly orbited while the seal between the casing 2 and the orbiting scroll 8 is securely sealed using the seal ring 16, and the seal ring can be compared with the prior art. 16 can reliably improve the sealing performance.

That is, when the face seal provided on the flange portion 4C of the fixed scroll 4 is slid on the front side of the end plate 8A as in the prior art, the orbiting scroll 8 is When the face seal rotates, the face seal slides in the radial direction within a certain area range with respect to the end plate 8A, and the sliding position of the face seal cannot be kept constant. When used over a long period of time, the sealing performance of the face seal is likely to decrease.

On the other hand, in the seal ring 16 according to the present embodiment, the outer peripheral side rotates with respect to the casing 2, and the inner peripheral side also performs rotational movement with respect to the orbiting scroll 8. A fixed sliding position along the circumference can be maintained with respect to the orbiting scroll 8, and the outer lip portion 21 can also maintain a fixed sliding position with the casing 2.

Therefore, according to the present embodiment, the compression chamber 9 located on the front side of the orbiting scroll 8 and the space inside the casing 2 located on the back side can be shut off by using the seal ring 16. Can be reliably prevented from entering the compression chamber 9 and being discharged to the outside together with the compressed air, and the high sealing performance of the seal ring 16 can be stably maintained for a long period of time. .

Further, since the flat plate portion 17 of the seal ring 16 is brought into elastic contact with the flange portion 4C of the fixed scroll 4, the fixed scroll 4 and the orbiting scroll 8 can be sealed by the flat plate portion 17 and the like. The sealing performance of the seal ring 16 can be further improved.

Further, by providing the core metal 18, the coil spring 20 and the leaf spring 22 on the seal ring 16, it is possible to provide the seal ring 16 with an appropriate rigidity and to slide the inner lip portion 19 and the outer lip portion 21. The contact state can be stabilized.

Next, FIGS. 7 to 9 show a second embodiment according to the present invention.
In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

However, the feature of the present embodiment is that a rotating ring as a rotating body is provided between the casing and the orbiting scroll, and around the rotating ring, for example, four O-rings, square rings and the like are provided. This is because a seal ring is provided.

Reference numeral 31 denotes a rotating ring used in this embodiment instead of the seal ring 16 used in the first embodiment. The rotating ring 31 has a cross section made of, for example, a resin material, a metal material, or the like. It is formed in a square shape, has substantially the same radial dimension as the seal ring 16 according to the first embodiment over the entire circumference, and has a narrow width portion 31A and a wide width portion 31B.
Etc. are provided.

Reference numerals 32, 34, 36, and 38 denote rotating rings 31.
The seal rings 32, 34, 36, and 38 are each formed of an O-ring, a square ring, or the like.

Here, the seal ring 32 is fitted in an annular groove 33 provided on the outer peripheral surface 8D of the end plate 8A of the orbiting scroll 8 with a tight allowance, and elastically slides on the inner peripheral side of the rotary ring 31. A first seal that makes contact with the rotary ring 31 and the orbiting scroll 8 is formed.

The seal ring 34 is
Is elastically mounted in an annular groove 35 provided in the end plate receiving recess 2E, and slides in contact with the outer peripheral side of the rotating ring 31 with interference, and seals between the rotating ring 31 and the casing 2. 2 constitutes the seal.

Further, the seal ring 36 is mounted in an annular groove 37 provided in the flange portion 4C of the fixed scroll 4, and seals between the front side of the rotating ring 31 and the fixed scroll 4.

Further, the seal ring 38 is
Is mounted in an annular groove 39 provided in the thrust receiving portion 2 </ b> C, and seals between the rear side of the rotating ring 31 and the casing 2.

When the orbiting scroll 8 makes a revolving motion, the rotating ring 31 rotates relative to the outer peripheral side of the orbiting scroll 8 while rotating in the end plate receiving recess 2E of the casing 2. At this time, the rotating ring 31 3
2, 34, 36 and 38, each compression chamber 9
It is configured to seal against the space inside.

Thus, in the present embodiment having the above-described structure, substantially the same operation and effect as those of the first embodiment can be obtained. And especially in this embodiment,
The seal rings 32, 34, 36, and 38 are
, The structure of the rotating ring 31 can be simplified and its durability can be improved.

In the first embodiment, the inner lip portion 19 and the outer lip portion 21 are integrally provided on the seal ring 16, but the present invention is not limited to this. The outer lip and the outer lip may be formed separately from the seal ring, and these may be attached to the seal ring.

In the first embodiment, the outer lip 21 provided on the seal ring 16 is brought into sliding contact with the end plate receiving recess 2E of the casing 2, but the present invention is not limited to this. For example, the orbiting scroll 8 is formed by a cylindrical portion of the fixed scroll by omitting the mounting projection 2D of the casing 2.
The outer lip portion 2 is configured to surround the outer peripheral side of the end plate 8A.
1 may be configured to be in sliding contact with the cylindrical portion of the fixed scroll.

Further, in the second embodiment, the grooves 33, 35, 37, and 39 for mounting the seal rings 32, 34, 36, and 38 are provided outside the rotary ring 31. The present invention is not limited to this.
A groove may be provided on the inner peripheral surface, the outer peripheral surface, the front surface, and the rear surface of the first member 1, and a seal ring mounted in each of the grooves may be in sliding contact with the fixed member 1 and the orbiting scroll 8.

Further, in each of the above embodiments, the description has been given by taking a half-oil type scroll type air compressor as an example. However, the present invention is not limited to this, and for example, a non-oil type scroll type air compressor, Alternatively, the present invention may be applied to a scroll-type fluid machine used as a scroll-type compressor or a vacuum pump for compressing a gas, a refrigerant, or the like other than air.

[0064]

As described in detail above, according to the first aspect of the present invention, since the rotating body and the first and second seals are provided between the fixed member and the orbiting scroll, the orbiting scroll can be used. At the time of the orbiting motion, the rotating body can be relatively rotated on the outer peripheral side of the orbiting scroll while rotating within the fixed member. At this time, the first and second seals are fixed to the orbiting scroll and the fixed member, respectively. The sliding contact position along the circumference can be held, and the space between the fixed member and the orbiting scroll can be stably sealed. Therefore,
The compression chamber and the space in the casing can be airtightly shut off. For example, even in a semi-lubricating scroll fluid machine in which lubrication oil is contained in the casing, it is possible to reliably prevent the lubrication oil from entering the compression chamber. At the same time, the high sealing performance of the first and second seals can be stably maintained for a long period of time.

According to the second aspect of the present invention, the center of the inner diameter of the ring-shaped rotating body is eccentric with respect to the center of the outer diameter by the turning radius of the orbiting scroll. A radial gap formed between the fixed member and the orbiting scroll can be stably covered by the rotating body,
When the orbiting scroll orbits, the rotating body can be pushed by the orbiting scroll in this state to relatively rotate between the fixed member and the orbiting scroll. Thus, the orbiting scroll can be smoothly orbited while reliably sealing between the fixed member and the orbiting scroll using the first and second seals.

Further, according to the third aspect of the invention, the inner lip of the seal ring is brought into sliding contact with the outer peripheral side of the orbiting scroll, and the outer lip is brought into sliding contact with the fixing member. While rotating relatively between the member and the orbiting scroll, it is possible to reliably seal between the fixed member and the orbiting scroll using the inner lip portion and the outer lip portion.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a scroll type air compressor according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of a main part showing an a part in FIG. 1 in an enlarged manner.

FIG. 3 is an enlarged view of a main part showing a part b in FIG. 1 in an enlarged manner.

FIG. 4 is a front view of the casing and the orbiting scroll with the fixed scroll removed.

FIG. 5 is a front view showing a state in which a seal ring is rotated with a turning motion of a turning scroll, as viewed from the same position as in FIG. 4;

FIG. 6 is a front view showing a state where the seal ring in FIG. 5 is further rotated.

FIG. 7 is a longitudinal sectional view showing a scroll type air compressor according to a second embodiment.

FIG. 8 is an enlarged view of a main part showing a part c in FIG. 7 in an enlarged manner.

FIG. 9 is an enlarged view of a main part showing a part d in FIG. 7 in an enlarged manner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed member 2 Casing 4 Fixed scroll 5 Drive shaft 8 Orbiting scroll 14 Suction port 15 Discharge port 16 Seal ring (rotary body) 19 Inner lip part (first seal) 21 Outer lip part (second seal) 31 Rotary ring (Rotating body) 32 Seal ring (first seal) 34 Seal ring (second seal)

Continued on the front page F term (reference) 3H029 AA02 AA15 AA21 AB02 BB05 BB16 CC04 CC19 3H039 AA02 AA08 AA12 BB11 BB15 CC02 CC03 CC31 CC43

Claims (3)

[Claims] 1. A fixed member comprising a cylindrical casing and a fixed scroll provided on an end side of the casing, and a rotatably provided inside the casing, and a distal end side extends in an axial direction toward the fixed scroll. Drive shaft,
A substantially disk-shaped swivel provided at the tip end of the drive shaft so as to be able to swivel, and when swirling within the fixed member, compresses fluid sucked from a suction port with the fixed scroll and discharges the fluid from a discharge port. In a scroll-type fluid machine including a scroll, between the fixed member and the orbiting scroll, the outer peripheral side of the orbiting scroll is disposed between the fixed member and the orbiting scroll. A ring-shaped rotating body that rotates relatively, a first seal extending in a circumferential direction along an inner circumferential side of the rotating body, and sealing between the rotating body and the orbiting scroll; and an outer circumferential side of the rotating body. A scroll-type fluid machine provided with a second seal extending in a circumferential direction along the periphery and sealing between the rotating body and the fixed member. 2. The rotating body has an outer diameter corresponding to a radial dimension of the fixed member and an inner diameter corresponding to an outer diameter dimension of the orbiting scroll, and the center of the inner diameter of the rotating body is an outer diameter. The scroll-type fluid machine according to claim 1, wherein the scroll-type fluid machine is disposed at a position eccentric to the center of the orbit by an amount corresponding to a turning radius of the orbiting scroll. 3. The rotating body comprises a seal ring formed of an elastic resin material. The rotary body elastically slidably contacts the outer peripheral side of the orbiting scroll over the entire circumference. An annular inner lip forming a seal;
The scroll-type fluid machine according to claim 1 or 2, further comprising an annular outer lip portion elastically slidably in contact with the fixing member over the entire circumference to form the second seal.