JPH08165994A - Scroll type fluid device - Google Patents

Abstract

PURPOSE: To reliably prevent bypass leakage of fluid through a gap spirally extending along a lap between a tip seal and a lap end face, in a scroll type fluid device having a tip seal arranged at a lap tip part. CONSTITUTION: A tip seal 20 is formed in a T-shape in cross section having a horizontal part 20a and a vertical part 20b hanging down from the central part of the horizontal part 20a and meanwhile, a groove 21 in which the vertical part 20b is fitted is formed in the central part in the direction of width of a lap 11b. Corrugated lead spring members 23 are respectively arranged in a contracting state between the under surface of the horizontal part 20a and the upper end face of the lap 11b and the under surface of the vertical part 20b and the bottom of the groove 21. Through the resilient force of the leaf spring member 23, the tip seal 20 is pressed against an end plate and a gap between the tip seal 20 and the lap 11 is intermittently partitioned throughout a peripheral direction.

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 device used for a compressor of a refrigeration system, and more particularly to a scroll type fluid device provided for sealing between a wrap end surface of one scroll and an end plate of the other scroll. The present invention relates to the improvement of the sealing property in the peripheral portion of the tip seal, as compared with the one provided with the tip seal.

[0002]

2. Description of the Related Art Conventionally, as a compressor of a refrigeration system,
For example, a scroll type fluid device as disclosed in Japanese Patent Laid-Open No. 6-280768 is known. This scroll type fluid device is provided with a fixed scroll and a revolving scroll in a compression mechanism part, and wraps standing on the end plates of the respective scrolls mesh with each other to form a working chamber therebetween.
As a fluid compression operation, the orbiting scroll revolves with respect to the fixed scroll without revolving, so that the working chamber is contracted and the fluid is compressed while moving to the scroll center side.

Further, in order to prevent fluid from leaking out in the radial direction of the scroll from the gap between the wrap end surface of each scroll and the end plate of the opposite scroll facing the wrap end surface, conventionally, FIG. Wrap as shown
A tip seal (b) is provided on the end face of (a). That is, a groove is formed in the widthwise center of the end face of the wrap (a).
(c) is formed, and a chip seal (b) made by stacking multiple metal plates is fitted into this groove (c), and
The tip seal (b) is pressed against the end plate (d) by introducing a high pressure in the working chamber into (c) (see arrow in FIG. 10).

As another structure of the tip seal, as shown in FIG. 11, the tip seal (b) is made of resin and the coil spring (e) is contracted in the groove (c) of the wrap (a). , The tip seal (b) to the end plate (d)
And the tip seal (b) is made to have a T-shaped or U-shaped cross-sectional shape as shown in FIGS. 12 and 13 while being engaged with the end surface of the wrap (a). By increasing the contact area of b) with the end plate (d), the sealing performance has been improved (actual plan 4).
-93784 and Japanese Patent Publication No. 59-36081).

[0005]

However, in each of the tip seals (b) described above, fluid leakage between the wrap (a) and the end plate (b) can be reduced, but the tip seal (b) and the wrap ( a) The high pressure fluid in the center of the working chamber leaks from the gap (A) to the outer peripheral side because the gap (A) formed between the end surface and the wrap (a) extends in the circumferential direction. There was a fear of coming out. That is, since the tip seal (b) is floated from the end surface of the wrap (a) by the fluid pressure and the spring biasing force described above to seal between the end plate (b), the tip seal ( b) and wrap
(a) There is a gap (A) between the end surface (Fig. 10 to Fig. 1).
3). The gap (A) extends in a spiral shape from the center side of the scroll toward the outer peripheral side along the shapes of the wrap (a) and the tip seal (b). Therefore, the high-pressure fluid in the center of the working chamber flows along this gap (A) and
Leakage from the outer peripheral side end of (a) into the low-pressure side space (hereinafter, this leakage is referred to as bypass leakage) was one of the major factors that reduced compression efficiency.

Further, in the conventional structure, the tip seal (b)
Since it is not known whether sufficient pressing force to press the end plate (d) against the end plate (d) is obtained, it cannot be said that the fluid can be reliably prevented from leaking in the radial direction of the scroll.

The present invention has been made in view of this point, and improves the tip seal provided at the end of the wrap and the structure around the tip seal with respect to the scroll type fluid device, thereby improving the bypass leakage and the bypass leakage. The purpose is to reliably prevent fluid leakage in the scroll radial direction.

[0008]

In order to achieve the above object, the present invention utilizes a member for partitioning the bypass leak passage by partitioning the bypass leak passage into a plurality of circumferentially adjacent spaces. The chip seal was pressed against the end plate.

Specifically, the invention according to claim 1 is provided with at least a pair of scrolls (10), (11) which are arranged so as to be opposed to each other and to be capable of relative swivel motion. ) And (11), the spiral wraps (10b) and (11b) are erected on the end plates (10a) and (11a), respectively.
A tip seal (20) is attached to the end faces of the laps (11b) and (10b) facing (a), and the wraps (10b) and (11b) mesh with each other and the wraps (10b) and (10b) The end face of 11b) comes into contact with the facing end plates (11a), (10a) via the tip seal (20), respectively, and the working chamber (14) is formed between the wraps (10b), (11b). It is assumed that the mold type fluid device is used. And, between the end faces of the tip seal (20) and the wraps (10b), (11b) facing each other, the wrap is provided between the both end faces.
(10b), (11b) A gap extending in the circumferential direction is formed. Further, the tip seal (20) and the wraps (10b) and (11b) are brought into contact with the facing surfaces of the tip seal (20) and the wraps (10b) and (11b) at a plurality of positions in the circumferential direction of the tip wraps (10b) and (11b). The space is divided into a plurality of spaces adjacent to each other in the circumferential direction, and a pressure seal means (23) for pressing the tip seal (20) toward the facing end plates (10a), (11a) is provided.

According to a second aspect of the present invention, in the scroll type fluid device according to the first aspect, the pressure seal means is provided.
A leaf spring member (2
3), the bent portion of the leaf spring member (23) is chip-sealed.
The end faces of the wrap (20) and the wraps (10b) and (11b) are in contact with each other.

According to a third aspect of the present invention, in a scroll type fluid device, the premise of which is the same as that of the first aspect of the invention, between the tip seal (20) and the end faces of the wraps (10b), (11b). A gap extending in the circumferential direction of the wraps (10b) and (11b) is formed in the. Further, the tip seal (20) is provided with the tip seal.
The (20) contacts the end faces of the laps (10b), (11b) facing each other at a plurality of positions in the circumferential direction, and the laps (10
b), (11b) is divided into a plurality of spaces adjacent to each other in the circumferential direction, and the end faces of the tip seals (20) facing the end plates (10a), (11a) are directed toward the end plates (10a), (11a). The pressing seal portion (24) for pressing is formed.

According to a fourth aspect of the present invention, in the scroll type fluid device according to the third aspect, the pressing seal portion is provided on a surface of the tip seal facing the end surfaces of the wraps (10b) and (11b). The protrusions (24) are provided so as to intermittently extend along the circumferential direction.

According to a fifth aspect of the present invention, in the scroll type fluid device according to the third aspect, the pressing seal portion is made of an elastic material, and the end faces of the wraps (10b) and (11b) and the scroll (1
It is configured to be compressed by the end plates (10a) and (11a) of 0) and (11).

The invention according to claim 6 is the above-mentioned claim 1,
In the scroll type fluid device described in 2, 3, 4 or 5, the end faces of the wraps (10b), (11b) are recessed in the widthwise central portions of the end faces of the wraps (10b), (11b). Forming a groove (21) extending along the. On the other hand, insert the tip seal (20) into the horizontal part facing the end faces of the wraps (10b) and (11b).
(20a) and a vertical portion (20b) extending from the widthwise central portion of the horizontal portion (20a) and fitted into the groove (21) are formed in a T-shaped cross section.

The invention according to claim 7 is the above-mentioned claim 1,
In the scroll type fluid device according to 2, 3, 4 or 5, the end faces of the wraps (10b) and (11b) are protruded at the center portions in the width direction of the wraps (10b) and (11b), and the spiral directions of the wraps (10b) and (11b). Forming a protrusion (27) extending along the. On the other hand, the tip seal (20) is formed in a U-shaped cross-section by forming a groove (26) into which the protrusion (27) is fitted, on the surface facing the end surfaces of the wraps (10b), (11b). I am trying.

[0016]

With the above construction, the present invention provides the following actions. According to the first aspect of the invention, when the device is driven, the pair of scrolls (10), (11) make a relative orbital motion, and the fluid is wrapped by the scrolls (10), (11).
It is introduced into the working chamber (14) formed between (10b) and (11b), compressed, and then discharged from the working chamber (14). During such driving, the tip seal (20) that was the bypass passage
And the gap formed between the wraps (10b) and (11b) are
The pressure sealing means (23) divides the wraps (10b), (11b) into a plurality of spaces that are adjacent to each other in the circumferential direction, thereby suppressing bypass leakage. In addition, this pressure seal means (2
3) presses the tip seal (20) toward the facing end plates (10a), (11a), which causes the pressing force to press the tip seal (20) against the end plates (10a), (11a). Sufficiently obtained, fluid leakage in the scroll radial direction is also suppressed.

According to the invention of claim 3, the tip seal (2
The pressing seal portion (24) formed in (0) is the above-mentioned claim 1.
By performing the same function as that of the pressing seal means (23) according to the described invention, bypass leakage and fluid leakage in the scroll radial direction are suppressed.

According to the second, fourth and fifth aspects of the present invention, the specific constitution of the pressure seal means (23) and the pressure seal portion (24) can be obtained, and the means for obtaining the above-mentioned high sealing property is practically used. You can improve your sex.

According to the sixth and seventh aspects of the invention, the shape of the tip seal (20) is improved so that the tip seal (20) is improved.
The contact area of the end plates with the end plates (10a), (11a) can be increased, and the fluid leakage in the radial direction of the scroll can be more reliably suppressed.

[0020]

Embodiments of the present invention will now be described with reference to the drawings. The scroll type fluid device according to this example is used as a compressor for a refrigerator, and compresses and discharges a refrigerant gas.

As shown in FIG. 1, in the scroll type fluid device (1), a scroll mechanism (3) for sucking, compressing and discharging a refrigerant gas is provided in an upper part of a closed casing (2).
Further, a drive mechanism (4) for driving the scroll mechanism (3) is housed in the lower part. Also the casing (2)
At a position facing the scroll mechanism (3) on the side wall of the suction pipe, a suction pipe for sucking the refrigerant gas into the scroll mechanism (3) is provided.
(5) is projected to the side, while the casing is
A discharge pipe (6) for discharging the refrigerant gas compressed in the scroll mechanism (3) from the casing (2) is provided at a central position on the upper surface of (2) so as to project upward.

The drive mechanism (4) comprises an electric motor (7) and a crankshaft (8) connected thereto. This Electric Motor (7)
Is composed of a stator (7a) and a rotor (7b) inserted in the stator (7a). The lower part of the crankshaft (8) is inserted in the rotor (7b), the lower end of the crankshaft (8) is configured as an oil supply pump (8a), and the oil supply pump (8a)
Is immersed in the lubricating oil stored in the oil sump (2a) below the casing (2). In addition, the crankshaft (8) has oil passages (8b), () for supplying the lubricating oil pumped up by the oil pump (8a) to the scroll mechanism (3) and the sliding parts of the crankshaft (8). 8b) is formed through.

The scroll mechanism (3) has a fixed scroll (1
0) and orbiting scroll (11). The fixed scroll (10) is integrally fixed to the casing (2), and a spiral (involute) wrap (10b) is erected on the lower surface of the disk-shaped end plate (10a). There is.
A discharge port (10c) for discharging the compressed gas refrigerant upward is formed in the center of the fixed scroll (10).

On the other hand, the orbiting scroll (11) is supported by the Oldham ring (13) in the support housing (12) which is arranged on the lower side of the orbiting scroll and fixed to the inner surface of the casing (2). It has a shape that is almost symmetrical to the fixed scroll (10), and a spiral (involute) wrap (11b) is erected on the upper surface of the disk-shaped end plate (11a). The scroll (10) and the wrap (10b) are arranged so as to mesh with each other. And FIG.
As shown in, the inner and outer wall surfaces of the wrap (11b) of the orbiting scroll (11) are the wraps of the fixed scroll (10).
The wall surfaces of the outer peripheral surface and the inner peripheral surface of (10b) are in contact with each other at a plurality of locations in the spiral direction, and a working chamber (14) for compressing the refrigerant gas is formed between these contact portions.

As shown in FIG. 1, the orbiting scroll (1
A scroll shaft (15) having a bearing hole (15a) formed in the center is provided on the rear surface of the end plate (11a) of 1) so as to project.

The upper end portion of the crankshaft (8) has a bearing hole (12a) formed in the support housing (12).
An eccentric cam portion that is eccentric to the shaft center (O) of the crankshaft (8) and has an outer diameter dimension that substantially matches the inner diameter of the bearing hole (15a). (8c) is integrally formed. The eccentric cam portion (8c) is fitted into the bearing hole (15a) of the orbiting scroll (11).
In addition, as described above, the Oldham ring (13) is interposed between the orbiting scroll (11) and the support housing (12), so that the orbiting scroll (11) is prevented from rotating as a rotation preventing mechanism. The Oldham coupling (16) is constructed.
With these configurations, the orbiting scroll (11) revolves without rotating with the rotation of the crankshaft (8) and the working chamber (1
4) is contracted.

Further, (17) in FIG. 1 is an eccentric cam portion (8
Crankshaft (8) located on the opposite side to the eccentric direction of c)
Is a balance weight that is provided integrally with the rotating scroll and that cancels the centrifugal force generated along with the revolution of the orbiting scroll (11). Reference numeral (18) is a counterweight for canceling out a moment generated around the bearing portion of the crankshaft (8) in a direction in which the crankshaft (8) swings.

The tip seals (20) mounted on the end faces of the wraps (10b) and (11b) of the scrolls (10) and (11) and their peripheral structures will be described as the characteristic features of this embodiment. To do. Also, here, the wrap (1) of the orbiting scroll (11) is
The tip seal (20) provided on the end face of 1b) will be described, but the tip seal provided on the end face of the wrap (10b) of the fixed scroll (10) has the same structure.

First, the end face of the wrap (11b) of the orbiting scroll (11) to which the tip seal (20) is attached will be described. Figure 3 shows the wrap (11b) of this orbiting scroll (11).
It shows a state where the tip seal (20) is attached to the end face of the. As shown in this figure, the orbiting scroll (11) wrap (11
On the end face of b), a lap mounting groove (21), which is a recessed portion, is formed at the center in the width direction over the entire circumference of the lap. As a result, the end surface of this wrap (11b) is attached to the bottom surface (21a) of the tip seal mounting groove (21) and the lap mounting groove (2
The groove side surfaces (21b) and (21b) which are the side surface portions of (1) and the groove side surfaces (21
It is composed of a pair of left and right wrap upper end faces (22), (22) extending in the width direction of the wrap (11b) from the upper ends of b), (21b).
The width dimensions of the groove bottom surface (21a) and the lap upper end surfaces (22), (22) are set to be substantially the same.

Next, the wrap (11
The tip seal (20) attached to the end face of b) will be described. The tip seal (20) is made of a resin material such as PTFE (polytetrafluoroethylene), has a T-shaped cross section, and has a plan view in FIG. 3 along the shape of the wrap (11b). It is formed in a spiral shape. More specifically, the tip seal (20) has a width dimension that substantially matches the width dimension of the wrap (11b), and has a horizontal portion (20a) that extends horizontally with a predetermined height dimension, and the horizontal portion (20a). 20a)
And a vertical portion (20b) protruding downward from the central portion in the width direction of the lower surface of the. And this vertical part (2
The width and height of 0b) are the width of the tip seal mounting groove (21) of the wrap (11b) (width of the groove bottom (21a)) and height (height of the groove side (21b)). ) Is almost the same. When the tip seal (20) having such a shape is attached to the end surface of the wrap (11b), the vertical portion (20b) of the tip seal (20) is fitted into the tip seal attachment groove (21), Top of horizontal part (20a) is fixed scroll (10)
It is adapted to come into contact with the end plate (10a).

The feature of this embodiment is that a plurality of leaf spring members (23), (23), (23) as a pressure sealing means are interposed between the tip seal (20) and the end surface of the wrap (11b). It is in place. The leaf spring member (23) is formed by bending a resin or metal (spring steel) plate material into a corrugated plate shape, and has a spiral shape along the shape of the wrap (11b) in plan view in FIG. Is formed in. Also, each leaf spring member (23)
The width of the groove is the groove bottom surface (21a) and lap top surface (22),
It corresponds to each width dimension of (22). Such a leaf spring member (23) is provided between the bottom surface (21a) of the groove of the wrap (11b) and the lower surface of the vertical portion (20b) of the tip seal (20), and the wrap upper end surface (2
2) and (22) and the lower surface of the horizontal portion (20a) of the tip seal (20), respectively. Therefore, on the groove bottom surface (21a) and the lap upper end surface (22) of the wrap (11b), the portion of the bent portion of the leaf spring member (23) that bulges downward at a plurality of locations along its circumferential direction. Of the leaf spring member (23) on the lower surface of the vertical portion (20b) of the tip seal (20) and the lower surface of the horizontal portion (20a) of the tip seal (20) at a plurality of points in the circumferential direction. The upper surface of the bent portion that is bulged upward is in contact. Further, the leaf spring member (23) interposed between the groove bottom surface (21a) of the wrap (11b) and the vertical portion (20b) bottom surface of the chip seal (20) has both side surfaces on the groove side surfaces (21b). , (21b) and is interposed between the upper end surfaces (22), (22) of the wrap and the lower surface of the horizontal part (20a) of the tip seal (20) (2
3) and (23), the side surface located on the center side in the wrap width direction is in contact with the side surface of the vertical portion (20b) of the tip seal (20).
Because of this, the groove bottom (21a) of the wrap (11b) and the tip seal
Between the lower surface of the vertical part (20b) of (20) and the upper end surfaces (22), (2
2) and the lower surface of the horizontal portion (20a) of the tip seal (20) are separated from each other by the leaf spring member (23) at a plurality of locations along the circumferential direction. There is.

Further, the height dimension and the horizontal portion (20) of the tip seal (20) in a state where no external force is applied to the leaf spring member (23).
The sum of the height of (a) (dimension t1 in FIG. 3) is the end plate (10a) of the wrap upper end face (22) and the fixed scroll (10) in the state where the scrolls (10) and (11) are combined. ) Is set to be slightly larger than the space between the scroll and the scroll (10), (11) so that the top of the horizontal part (20a) of the tip seal (20) is fixed. scroll
While touching the bottom surface of the end plate (10a) of (10),
(22), (22) and the bottom of the groove (21a) between the leaf spring member (23),
(23) and (23) are pressed in the height direction. Therefore, each leaf spring member (23), (23), (23) is elastically deformed so that the height dimension becomes short, and the reaction force of this deformation causes the wrapping.
The pressing force against (11b) and the tip seal (20) is kept high. That is, the tip force of the tip seal (20) of the tip seal (20) is pressed against the end plate (10a) of the fixed scroll (10) by this reaction force.

Next, the compression operation of the scroll type fluid device (1) constructed as described above will be explained. Electric motor
When (7) is driven, the crankshaft (8) rotates about the shaft center (O). At this time, the eccentric cam portion (8c) revolves around the axis (O) of the crankshaft (8). With this,
The orbiting scroll (11) with which the eccentric cam portion (8c) is linked is prevented from rotating by the Oldham coupling (16), and thus revolves around the fixed scroll (10).

As a result, the contact points of the wraps (10b) and (11b) of the scrolls (10) and (11) are determined by the scroll mechanism.
It moves toward the center of (3), and with it, the working chamber (1
4) is contracted while moving spirally toward the center.
By this series of operations, low-pressure refrigerant gas is sucked into the suction pipe (5).
Flow into the working chamber (14). And this working chamber (14)
The refrigerant that has flowed into the chamber is compressed to a high pressure and becomes a working chamber (1
After reaching the center of (4), it passes through the discharge port (10c), passes through the space above the scroll mechanism (3), and is discharged from the discharge pipe (6).

During the compression operation, the oil supply pump (8a)
The lubricating oil pumped up by the oil passes through the oil supply passages (8b), (8b) and the radial bearing portion on the outer peripheral side of the crankshaft (8),
It is supplied to the thrust bearing part at the upper end of the crankshaft (8) and lubricates the sliding parts of the crankshaft (8) and the orbiting scroll (11).

Then, in such a compression operation, as described above, the leaf spring member (23) is compressed between the wrap (11b) and the tip seal (20) so that the height dimension is shortened. The tip seal (20) is pressed against the end plate (10a) of the fixed scroll (10) by the reaction force of this deformation, and the shape of the tip seal (20) is T-shaped in cross section. Because of the large contact area with the end plate (10a), the end surface of the wrap (11b) and the fixed scroll (1
There is no gap between the end plate (0) and the end plate (10a), which prevents the refrigerant gas from leaking in the radial direction of the scrolls (10) and (11).

Further, as described above, between the groove bottom surface (21a) of the wrap (11b) and the lower surface of the vertical portion (20b) of the tip seal (20), the wrap upper end surfaces (22) and (22) and the tip seal ( The gaps respectively formed between the lower surface of the horizontal portion (20a) and the lower surface of the horizontal portion (20a) are divided by the leaf spring member (23) at a plurality of locations in the circumferential direction. That is, the gap formed between the wrap (11b) and the tip seal (20) is not a continuous space in the spiral direction of the wrap (11b) but is divided into a plurality of spaces. Therefore, the labyrinth sealing effect of the leaf spring member (23) is exerted, whereby the high-pressure fluid in the center side of the working chamber (14) flows through this gap to the low-pressure side from the outer peripheral end of the wrap (11b). It is possible to avoid the occurrence of so-called bypass leakage that leaks into the space.

Further, as described above, the leaf spring member (23)
Is elastically deformed so that the height dimension becomes short, so that a large contact force is secured for the wrap (11b) and the tip seal (20) at the bent portion of the leaf spring member (23). Wraps are never separated
The plurality of gaps formed between the (11b) and the tip seal (20) do not communicate with each other.
A similar operation is performed between the lap end face portion of the fixed scroll (10) and the end plate (11a) of the orbiting scroll (11), and the leakage of refrigerant gas at this portion is also suppressed. As described above, according to the configuration of this example, the presence of the leaf spring member (23) causes the wrap that is the original function of the tip seal (20).
(10b), (11b) Not only the seal between the ends and the end plates (11a), (10a) is sufficiently secured, but it is also formed between the wrap (11b) and the tip seal (20). Bypass leakage from the gap extending in the circumferential direction can also be suppressed, and the sealability of the working chamber (14) can be significantly improved. Therefore, the shape of the tip seal (20) and the wrap (10b), (11b)
Since the above-mentioned leakage can be reliably suppressed by the elastic reaction force of the leaf spring member (23) and the labyrinth seal effect without requiring high processing accuracy in the shape of the end face portion of the device, the processing cost of the entire device can be reduced. .

(Modification) Next, the leaf spring member (23) described above is used.
A plurality of modified examples will be described in which the above effects can be obtained without using. Further, this example is a modified example of the tip seal (20), and other configurations are the same as the above-described embodiments, so here, the tip seal (20) is used.
Only the shape of will be described. In each of the modified examples, the tip seal (20) provided on the wrap (11b) of the orbiting scroll (11) will be described, but the fixed crawl (10)
A similar tip seal is provided for the wrap (10b).

-First Modification-First, a first modification will be described with reference to FIG. As shown in the figure, in the tip seal (20) of this example, the lower surface of the horizontal portion (20a) and the lower end surface of the vertical portion (20b) are formed in a corrugated plate shape. That is, on each lower surface, the bulging portions (24), (24), ... As the pressing seal portion that bulge downward, and the concave portion (25) located between the bulging portions (24), (24). , (25) are alternately and continuously formed in the circumferential direction.

The height dimension (dimension t2 in FIG. 4) of the portion of the tip seal (20) where the bulging portion (24) is formed is in a state in which the scrolls (10) and (11) are combined. Lap top surface (22) and fixed scroll (10) end plate (10
It is set to be slightly larger than the space dimension between a).
Therefore, when the scrolls (10) are combined, the bulging portion (24) is elastically deformed in the height direction. Further, a substantially semi-cylindrical groove (24a) is formed on the side surface of each bulging portion (24) so that the amount of elastic deformation can be sufficiently obtained. In addition, this groove (24a)
It does not penetrate the width of the tip seal (20).

Therefore, when the scrolls (10) are combined, the bulging portion (24) elastically deforms in the height direction, and the tip seal (20) is caused by the reaction force of this deformation.
The pressing force on the lap (11b) and the end plate (10a) is maintained high. In other words, this reaction force causes the tip seal
(20) will be pressed against the end plate (10a) of the fixed scroll (10), and the bottom surface (21a) of the groove of the wrap (11b) will be
And the vertical part (20b) of the tip seal (20) and the bottom surface of the lap (22) and the horizontal part (20a) of the tip seal (20).
The gap between the lower surface and the lower surface is partitioned by the bulging portions (24) at a plurality of locations in the circumferential direction. Therefore, even in this example, the wrap (1) which is the original function of the tip seal (20) is
Not only is there sufficient sealing between the end of 1b) and the end plate (10a) of the fixed scroll (10), but also the wrap (11a).
By-pass leakage from the gap formed between b) and the tip seal (20) can also be suppressed, and the working chamber (14)
The sealability of can be greatly improved. Further, in the configuration of this example, the leaf spring member as shown in the above-described example is not necessary, and the sealing performance can be improved only by the tip seal (20), so that the assembly work of the device is simplified. Also, the manufacturing cost can be reduced.

-Second Modification- Next, a second modification will be described with reference to FIG. As shown in the figure, the tip seal (20) of the present example has a U-shaped cross section in which a groove (26) extending in the circumferential direction is formed in the central portion of the lower surface in the width direction. On the other hand, a projecting portion (27) that fits into the groove (26) is formed in the center portion in the width direction of the end surface of the wrap (11b). And tip seal
The lower end surface of the (20) and the bottom surface of the groove (26) have the same shape as that of the first modified example described above, and the bulging portion (24) has the wrap (11).
The end faces (22), (22) of (b) and the end face (27a) of the protruding portion (27) are in contact with each other.

Therefore, according to the structure of this embodiment, the wrap portion is deformed by the deformation of the bulging portion (24) similarly to the first modification.
A sufficient sealability is secured between the end of (11b) and the end plate (10a) of the fixed scroll (10), and the gap formed between the wrap (11b) and the tip seal (20). It is possible to suppress bypass leakage from the.

-Third Modification- Next, a third modification will be described with reference to FIG. This example is a tip seal with a T-shaped cross section similar to the first modification described above.
The target is (20). As shown in the figure, the tip seal (20) of this example has a plate-like shape on the lower surface of the horizontal portion (20a) and the lower end surface of the vertical portion (20b) and protrudes in a direction inclined with respect to each surface. The plurality of elastic plate portions (28), (28), ... Are continuously formed in the circumferential direction. Even with such a configuration, it is possible to obtain the same high sealing performance as described above by the elastic plate portions (28), (28), ... Deformation.

-Fourth Modification- Next, a fourth modification will be described with reference to FIG. As shown in the figure, the tip seal (20) of this example has a plate-like shape protruding from the lower surface of the horizontal portion (20a) and the lower end surface of the vertical portion (20b) in a direction orthogonal to each surface. A plurality of elastic plate parts (29),
(29), ... Are continuously formed in the circumferential direction.

According to this structure, each scroll (1
In the state where 0) and (11) are combined, the elastic plate parts (29), (29),
The tip portion of ... Is buckled and deformed, whereby the same high sealing performance as described above can be obtained.

-Fifth Modification- Next, a fifth modification will be described with reference to FIG. As shown in this figure, the tip seal (20) of this example has intermittent bulging in the circumferential direction by making the lower surface of the horizontal portion (20a) and the lower end surface of the vertical portion (20b) mountain-shaped. The parts (30), (30), ... Are formed.

Even with such a configuration, each scroll
In the state where (10) and (11) are combined, the bulge parts (30), (30),
The tip portion of ... Is elastically deformed, whereby the same high sealing performance as described above can be obtained.

-Sixth Modification- Next, a sixth modification will be described with reference to FIG. As shown in the figure, the tip seal (20) of this example has a two-layer structure. Specifically, the portion of the fixed scroll (10) that comes into contact with the end plate (10a) is configured as a sliding portion (31) made of a plate-shaped sliding material (such as resin), whereas the wrap (11b) is used. The portion that engages with is composed of an engaging portion (32) made of a rubber material or a foamed resin material having a T-shaped cross section. And each scroll (1
In the state where (0) and (11) are combined, the engaging portion (32) is
It is adapted to be elastically deformed between the wrap (11b) and the (10b).

Therefore, in this example, the engaging portion (32)
Due to the elastic deformation of, it is possible to obtain the same high sealing performance as described above.

Although the compressor for the refrigerator has been described in this example, the scroll type fluid device (1) of the present invention may be used for a vacuum pump, an expander or the like.

As the tip seal (20), the one having a T-shaped or U-shaped cross-section has been described, but a tip-shaped seal having a generally rectangular cross-section (see FIG. 11) is provided. May be applied to.

Further, in the present embodiment, the case where the present invention is applied to the one having the pair of upper and lower scrolls has been described, but the present invention is not limited to this, and the one having the orbiting scroll between the pair of upper and lower fixed scrolls, On the contrary, it may be applied to a so-called double-toothed scroll type fluid device having a fixed scroll between a pair of upper and lower orbiting scrolls.

[0055]

As described above, according to the present invention, the following effects are exhibited. According to the first aspect of the invention, the gaps formed between the end surfaces of the tip seal and the wrap facing each other are contacted with the end surfaces of the tip seal and the wrap facing each other at a plurality of positions in the circumferential direction. The gap is divided into a plurality of spaces adjacent to each other in the circumferential direction of the lap, and the pressure seal means for pressing the chip seal toward the facing end plate is provided. Not only is the sealing property sufficiently secured between the wrap and the tip seal, but also bypass leakage from the gap formed between the wrap and the tip seal and extending in the circumferential direction can be suppressed, and the sealing of the working chamber is achieved. It is possible to significantly improve the sex. For this reason, fluid leakage can be reliably suppressed without requiring high processing accuracy in the assembly accuracy and the shape of the end face portion of the wrap, so that the processing cost of the entire apparatus can be reduced.

According to the third aspect of the present invention, the pressure seal portion formed on the chip seal fulfills the same function as the pressure seal means according to the first aspect of the invention. The effect according to the invention described in claim 1 can be exerted only by the tip seal, and as the number of parts is reduced, the assembling work of the device can be simplified and the manufacturing cost can be reduced.

According to the invention described in claims 2, 4 and 5,
It is possible to obtain a specific configuration of the pressure seal means and the pressure seal portion, to enhance the practicality of the means for obtaining the above-mentioned effects, and to specifically realize an apparatus equipped with such means.

According to the sixth and seventh aspects of the present invention, the contact area of the tip seal with the end plate can be increased, fluid leakage in the scroll radial direction can be more reliably suppressed, and the tip seal sealing function can be further improved. You can

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a scroll type fluid device according to an embodiment.

FIG. 2 is a cross-sectional view showing a meshed state of each wrap.

FIG. 3 is a perspective view showing a mounted state of a tip seal on a wrap.

FIG. 4 is a perspective view of a tip seal according to a first modified example.

FIG. 5 is a perspective view of a tip seal according to a second modification.

FIG. 6 is a perspective view of a tip seal according to a third modified example.

FIG. 7 is a perspective view of a tip seal according to a fourth modified example.

FIG. 8 is a perspective view of a tip seal according to a fifth modification.

FIG. 9 is a perspective view of a tip seal according to a sixth modified example.

FIG. 10 is a cross-sectional view showing a mounted state of a tip seal on a wrap in a conventional example.

FIG. 11 is a cross-sectional view showing how a tip seal is attached to a wrap in another conventional example.

FIG. 12 is a cross-sectional view showing a mounted state of a tip seal on a wrap in another conventional example.

FIG. 13 is a cross-sectional view showing a mounted state of a tip seal on a wrap in another conventional example.

[Explanation of symbols]

 (1) Scroll type fluid device (10) Fixed scroll (11) Orbiting scroll (10a), (11a) End plate (10b), (11b) Wrap (14) Working chamber (20) Tip seal (20a) Horizontal part (20b) ) Vertical part (21) Chip seal mounting groove (23) Leaf spring member (pressing seal means) (24) Bulging part (pressing seal part) (26) Groove (27) Projection part

Claims (7)

[Claims] 1. At least a pair of scrolls (1) arranged to face each other and to be capable of relative orbital movement.
0) and (11), and scroll plates (10a) and (11a) of the scrolls (10) and (11) are provided with spiral wraps (10b) and (11b), respectively. Ten
A tip seal (20) is attached to the end faces of the laps (11b) and (10b) facing the a) and (11a).
b) When the wraps (10b) and (11b) are in mesh with each other, the end faces of the wraps (10b) and (11b) come into contact with the facing end plates (11a) and (10a) via the tip seals (20). (11b) Between the working chamber (1
In the scroll type fluid device in which 4) is formed, the tip seal (20) and the wraps (10b), (11b) are provided between the opposite end faces of the wrap (10
b), (11b) A gap extending in the circumferential direction is formed, and the tip seal (20) and the wraps (10b), (11b) are formed in this gap.
b) contact the end faces facing each other at a plurality of locations in the circumferential direction to divide the gap into a plurality of spaces adjacent to the laps (10b) and (11b) in the circumferential direction, and at the same time, insert the tip seal (2
A scroll type fluid device characterized in that a pressure seal means (23) for pressing the (0) toward the facing end plates (10a), (11a) is provided. 2. The pressing seal means is a leaf spring member (23) formed in a corrugated plate shape by bending a plurality of portions, and the bent portion of the leaf spring member (23) is a chip seal (20) and Wrap (1
The scroll type fluid device according to claim 1, wherein the end faces of 0b) and (11b) facing each other are in contact with each other. 3. At least a pair of scrolls (1) arranged to face each other and to be capable of relative orbital movement.
0) and (11), and scroll plates (10a) and (11a) of the scrolls (10) and (11) are provided with spiral wraps (10b) and (11b), respectively. Ten
A tip seal (20) is attached to the end faces of the laps (11b) and (10b) facing the a) and (11a).
b) When the wraps (10b) and (11b) are in mesh with each other, the end faces of the wraps (10b) and (11b) come into contact with the facing end plates (11a) and (10a) via the tip seals (20). (11b) Between the working chamber (1
In the scroll type fluid device in which 4) is formed, in the tip seal (20), a gap extending in the circumferential direction of the wraps (10b) and (11b) is formed between the end faces of the wraps (10b) and (11b). The tip seal (20) wraps the gap by contacting the end faces of the wraps (10b), (11b) facing the tip seal (20) at a plurality of positions in the circumferential direction. (10b), (11b) The end face of the tip seal (20) facing the end plates (10a), (11a) is divided into a plurality of spaces adjacent to each other in the circumferential direction, and
A scroll type fluid device characterized in that a press seal portion (24) for pressing toward 0a) and (11a) is formed. 4. The pressing seal portion is provided on a surface of the tip seal (20) facing the end surfaces of the wraps (10b), (11b).
4. The scroll type fluid device according to claim 3, wherein the scroll type fluid device is formed of a projecting portion (24) intermittently provided in a projecting manner in the circumferential direction. 5. The pressure seal portion is made of an elastic material, and has end faces of the wraps (10b) and (11b) and end plates (1) of the scrolls (10) and (11).
4. The scroll type fluid device according to claim 3, wherein the scroll type fluid device is compressed by 0a) and (11a). 6. The end faces of the wraps (10b), (11b) are recessed at the center portions in the width direction of the wraps (10b), (11b).
A groove (21) extending along the spiral direction of (b) is formed, and the tip seal (20) includes a horizontal portion (20a) facing the end faces of the wraps (10b), (11b) and the horizontal portion (20a). 20. A vertical portion (20b) extending from the center of the groove (20a) in the width direction and fitted in the groove (21) is formed into a T-shaped cross section. 4. The scroll type fluid device according to 4 or 5. 7. The end faces of the wraps (10b), (11b) are projected at the center portion in the width direction of the wraps (10b), (11b).
The protrusion (27) extending along the spiral direction of b) is formed, and the tip seal (20) has the protrusion (27) on the surface facing the end faces of the wraps (10b) and (11b). The scroll type fluid device according to claim 1, 2, 3, 4 or 5, wherein a groove (26) for fitting is formed to have a U-shaped cross section.