JP2000314383A - Scroll fluid machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll fluid machine which can keep lifting pressure for lifting a tip seal, even when entering pressure of the tip seal into the groove is small. SOLUTION: Bottom cut-in portions 44 are formed on a tip seal 34 so as to be opened in a direction that fluid compressed by sealed space shows high pressure, for providing a sliding surface 34a of the tip seal 34 with elasticity for pressurizing a mating side mirror surface, when the tip seal 34 is arranged between the bottom of a tip seal groove 43 and the mating side mirror surface. A seal member groove is formed on the tip seal 34, on a side face so as to be opposed to a groove wall of the tip seal groove 43 on the side of a low pressure side space, to member groove, a seal member 40 made of material softener than that of the tip seal can be fitted. A clearance between the tip seal groove 43 and the tip seal 34 is sealed by the sealing member 40 arranged to the seal member groove.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll fluid machine for compressing, expanding and pumping a fluid, and more particularly to a scroll fluid machine in which a tip seal and another seal member are interposed in a tip seal groove on an upper surface of a wrap.

[0002]

2. Description of the Related Art Conventionally, a tip seal groove is provided on an upper surface of a wrap planted on a mirror surface of a fixed scroll or an orbiting scroll or the like, facing a counterpart mirror surface, and a chip seal is mounted on the chip seal groove. Scroll fluid machines configured to hermetically hold the space formed by the orbiting scroll wrap together with the tip seal are well known.

[0003] Japanese Patent Publication No. 6-96961 is one of them. According to this technique, a voltage is applied from the center region in the spiral direction of the tip seal to the outer periphery toward two adjacent surfaces of the tip seal facing the bottom surface of the tip seal groove formed on the upper surface of the wrap and the high-pressure side wall surface. A plurality of cuts are provided which receive pressure and are elastically pressed against the groove surface.

Accordingly, compared with the case where the plurality of cuts are not provided, a high pressure is applied to the cuts, and the chip seal surfaces on the opposite sides are pressed against the side wall surfaces of the chip seal groove on the other side. Fluid leakage along the direction can be prevented as much as possible.

[0005]

However, when the pressure of the discharged fluid entering the chip seal groove from the discharge side toward the suction side in the groove is low, the cutout on the bottom surface of the chip seal is greatly opened. The contact between the tip of the cut and the bottom of the tip seal groove is reduced.
Since the pressure behind the tip seal (floating pressure) generated on the bottom surface is weak, and the pressure that penetrates into the high pressure side surface of the chip seal groove from the crescent-shaped compression chamber on the high pressure side is low, the pressure of the tip seal is reduced from the high pressure side surface. The force to press the side surface in the direction is also weak.

Accordingly, the degree of chip seal adhesion to the low pressure side surface of the chip seal groove is weakened, and leakage occurs from the low pressure side surface. As a result, high-pressure fluid leaks from the high-pressure crescent-shaped compression chamber to the low-pressure crescent-shaped compression chamber through the high-pressure side surface, the bottom surface, and the low-pressure side surface of the tip seal. The generated floating pressure cannot be maintained.

Therefore, when the floating pressure generated on the bottom surface of the tip seal disappears or is extremely weak, the contact state between the sliding surface of the tip seal and the counterpart mirror surface is deteriorated, and the high-pressure fluid flows between the sliding surface and the counterpart mirror surface. And leaks directly from the crescent-shaped compression chamber on the high pressure side to the crescent-shaped compression chamber on the low pressure side, and the function of the tip seal between the mating mirror surface and the sliding surface of the tip seal is weakened, resulting in There was a problem that the function of the tip seal could not be fully exhibited.

SUMMARY OF THE INVENTION In view of the above problems, the present invention can maintain the floating pressure at which the tip seal can float on the bottom surface even when the pressure penetrating into the groove of the tip seal is small. It is an object of the present invention to provide a scroll fluid machine with improved.

[0009]

SUMMARY OF THE INVENTION According to the present invention, a revolving scroll is revolved with respect to a fixed scroll by restricting the rotation of the revolving scroll, and mirror surfaces of both scrolls, a wrap implanted on the mirror surface, In a scroll fluid machine for compressing or expanding an intake fluid by a sealed space formed by a chip seal groove cut into the upper end of a wrap and formed by a chip seal sliding on a counterpart mirror surface, at least the tip seal A plurality of cuts are formed on the bottom surface of the chip seal, and the inlet of the cut is formed in the longitudinal gap in the chip seal groove in an oblique direction toward the flow of the compressed fluid from the discharge side to the suction side, and is compressed. When the fluid enters the longitudinal gap, the cutout is provided so as to be opened, and by opening the cut, the chip seal is formed as a chip seal groove. Lifting and sealing between the sliding surface of the tip seal and the counterpart mirror surface, and a sealing member that is more flexible than the tip seal can be attached to the side face of the tip seal groove facing the groove wall on the low pressure side space side. And a seal member groove provided between the tip seal groove and the tip seal.

[0010] The present invention provides a method for compressing a tip seal at a high pressure when the tip seal is disposed between the bottom face of the chip seal groove and the counterpart mirror surface on a bottom surface of the tip seal opposite to a sliding surface in sliding contact with a counterpart mirror surface. A bottom cut in which the fluid floats the tip seal in the direction in which the sliding surface presses against the other mirror surface,
It is the same as the related art that the fluid compressed by the closed space is provided so as to be opened in the direction in which the pressure becomes high, and the gap between the counterpart mirror surface and the sliding surface is sealed.

However, the present invention is not limited to this, and a seal member groove to which a seal member more flexible than the chip seal can be attached is provided on the side surface of the chip seal groove facing the groove wall on the low pressure side space side. Since the seal member is configured to seal between the chip seal groove and the chip seal, the elastic force of the seal member causes the chip seal side surface and the chip seal groove wall surface, Fluid leakage is prevented by the chip seal groove wall surface and the chip seal.

Further, according to the present invention, by adopting the above-mentioned structure, in order to prevent fluid leakage from the side surface of the chip seal, the chip seal width is not fitted without a gap into the chip seal groove width. The seal width is narrower than the chip seal groove width, and both the seal member and the chip seal which are more flexible than the chip seal are inserted. Therefore, the tip seal can be easily inserted.

Further, when the tip seal groove W, the tip seal width tw, and the projection height y when the seal member is inserted into the seal member groove, 1 ≦ {(tw + y) / W} ≦ 1.2. It is also an effective means of the present invention to configure by setting.
In the case of a hollow cylinder, or when the cross-sectional area is small like a triangle, the protruding height y when the sealing member is inserted becomes large, and when the cross-sectional area is large like a square, the protruding height y is small. Become.

It is also an effective means of the present invention that the chip seal groove is provided with a groove shielding wall at least at a low-pressure side end, and the chip seal end is configured to approach or abut the groove shielding wall. According to such technical means, the low pressure side end of the tip seal groove is closed or is equivalent to being closed, so that there is no or very little fluid leakage.

Further, the tip seal attached to the tip seal groove has a plurality of cuts formed on one side and / or the other side, and the entrance of the cut forms a longitudinal gap in the chip seal groove on the discharge side. It is also effective that the present invention is configured such that it is formed in a direction oblique to the flow of the compressed fluid from the suction fluid to the suction side, and is provided in a direction in which the cutout is opened when the compressed fluid enters the longitudinal gap. Means. According to such a technical means, since the side surface of the tip seal has a side cut, during operation of the scroll fluid machine, a high pressure is applied to the other side and the seal member disposed on one side is pressed to press the other side. Even if the side surface is separated from the chip seal groove surface, leakage of the fluid is prevented by the side cut.

When a side surface cut is provided on the surface on the side of the seal member, the side cut makes up for the elastic force of the seal member, and the seal member can be made of a member having a weak elastic force.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to an embodiment shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the invention thereto, but are merely illustrative examples unless otherwise specified. Not just.

FIG. 17 is a cross-sectional view of a main part showing a schematic structure according to an embodiment of the scroll fluid machine to which the present invention is applied. FIG. 18 is a view taken along the line AA of FIG. FIG. 18 is a sectional view taken along line BB of FIG. 17.

As shown in FIG. 17, a scroll fluid machine 1 according to the present invention is provided with a fixed scroll 11, a fixed scroll housing 13 mounted on an upper portion thereof, and an orbit connected to a drive shaft 3 of a motor 2 in an internal space thereof. The fixed scroll 11 and the housing 13 and the orbiting scroll 12 are formed of a metal member such as aluminum.

The fixed scroll 11 is formed in a conical shape having a triangular cross section as shown in FIG. 19, and has three vertices each having a crank pin 22 of a pin crank mechanism 10 described later, which is a rotation preventing mechanism of the orbiting scroll. (FIG. 17),
An opening 11g is set so as to fit the crankpin 22 to the bearings 8 and 9 so as to be rotatable and to fit the outer periphery of the bearing. An opening 11h of a smaller diameter having a step for holding the outer ring of the bearing 9 is provided.

In the center of a sliding surface 11c used as a reference surface of the fixed scroll 11 in the assembling, a discharge hole 11 (FIG. 17) for discharging a compressed gas described later is communicated with a discharge hole 11 communicating therewith.
d is opened, and the discharge hole 11 is formed in the sliding surface 11c.
A fixed scroll wrap 11a is implanted near d. The tip end of the wrap 11a is provided with a self-lubricating tip seal 34 (FIG. 17) for slidingly contacting a mating sliding surface to form a sealed space. The tip seal 3
No. 4 is excellent in abrasion resistance and slidability, for example, fluorine resin such as polytetrafluoroethylene (PTFE), polyethersulfan (PES), polyphenylene sulfide (PPS), polyetheretherketone (PE)
EK), liquid crystal polymer (LCP), polystyrene (P
It can be formed of an elastic resin material such as SF).

The sliding surface 11c has an opening 11e (FIG. 1) communicating with the gas suction ports 15, 15 (FIG. 18).
9) has been established. Also, a number of cooling and reinforcing fins 11b are provided on a bottom surface 11i outside the fixed scroll 11.
(FIG. 18) is implanted.

On the upper portion of the fixed scroll 11, a base portion 13a having the same cross-sectional outer shape as the fixed scroll 11 is provided.
Is fixed with a screw. A space 13b is provided in the base 13a,
An opening 13f of the housing is formed in the space 13b, and is formed so that cooling is applied by blowing air to cooling fins on the back surface of the orbiting scroll. The space 13b
A connecting portion 13d is provided as a connecting portion with a motor having a space 13c smaller than 13b at an upper portion thereof, and a motor 2 having a drive shaft 3 is provided at an upper portion thereof.

Empty space 13 of fixed scroll housing 13
b, the orbiting scroll 12 on which the orbiting scroll wrap 12a having a plane facing the wall surface of the fixed scroll wrap 11a is provided. The fixed scroll housing 13 is provided on a sliding surface 12e, which is rotatably connected to the sliding surface 12e and is located near the outer periphery opposite to the wrap surface.
The dust seal 36 having self-lubricating property disposed in the sliding portion 13e is slidably slidable.

A plurality of cooling fins 12b are provided upright on the surface opposite to the orbiting scroll wrap surface so that the orbiting scroll can be cooled by the outside air flowing from the opening 13f of the housing 13. A tip seal 35 having a self-lubricating property for forming a closed space by slidingly contacting the sliding surface of the counterpart scroll is disposed at the tip of the orbiting scroll wrap 12a.

At the position of the orbiting scroll 12 corresponding to the opening 11g of the fixed scroll 11, three opening holes 12 are provided.
g, and bearings 6 and 7 are provided in the opening 12g.
The crankpin 21 is inserted into the inner ring of these bearings, and two O-rings 23 and 24 are inserted into grooves provided on the outer periphery of the crankpin 21. The pin 21 is configured to be swingable in the radial direction.

The crank pin 21 is implanted on the crank plate 17 via a spacer 18, a spring washer 32 is interposed between the spacer 18 and the bearing 7, and a screw is provided on the upper surface of the bearing 6 via a holding plate 19. 37 prevents the bearing 6 from being separated from the crankpin 21 and allows the relative position between the crankpin 21 and the bearing 6 to be adjusted and regulated, so that there is play between the bearing and the crank plate. To eliminate backlash.

The crank pin 2 of the crank plate 17
A crank pin 22 having an axis is implanted on a side opposite to the axis 1 at a distance p from the axis of the crank pin 21, and the crank pin 22 is fitted into an opening hole 11 g of the fixed scroll 11. The bearings 8 and 9 are inserted into inner rings.

The crank pin 22 has a spring washer 33 interposed between the crank plate 17 and the bearing 8, and the upper and lower surfaces of the bearing 9 are separated from the upper and lower bearings by screws 38 via the pressing plate 20. I have.

Next, the operation of the thus-configured scroll fluid machine according to the present embodiment will be described. In FIG. 17, when the motor 2 rotates and the orbiting scroll 12 starts the orbiting motion, the fluid taken in from the leading ends of the wraps 11a and 12a respectively becomes the wraps 12a and 11a.
The wrap is compressed by the crescent-shaped closed space of the wrap, and is discharged to the discharge port 16 from the discharge hole 11d opened in the central portion.

In the process, the high heat generated by being compressed by the closed space causes the cooling fins 12b provided on the back surface of the orbiting scroll 12 to cool the cooling fins 12b by rotating and disturbing the air flowing from the opening 13f. Is done. The high heat is cooled by the cooling fins 11b of the fixed scroll 11.

In the manufacturing and assembling process, if an interfering portion occurs between the drive portion and the fixed portion due to the accumulated error due to the combination of the orbiting scroll and the fixed scroll housing, the force in the direction in which the laps collide with each other is applied to the crank pin 21. And 22 are absorbed by the deformation of the O-ring. Then, as shown in FIG. 17, the O-rings 23 and 24 of the crankpin 21 are deformed,
The turning error due to the accumulated error is absorbed.

Therefore, the lap wall surfaces do not rub against each other with a large force, and the crank pin does not directly rub against the wall surface of the inner ring of the bearing. By absorbing the turning error in driving between the two scrolls by the absorbing mechanism constituted by the above, the occurrence of the fretting phenomenon on the contact between the both wrap wall surfaces and the sliding contact surface of the pin crank mechanism is improved, and the durability is improved. Also, there is no need to use a drive source with a large output that covers the load due to the turning error,
It is economical.

FIG. 1 is a view showing an embodiment of the present invention, FIG. 2 is a vertical sectional view of FIG. 1 in the extending direction, and FIG.
FIG. In these figures, wrap 11
A groove 43 is cut in the upper surface 42 facing the other-side mirror surface 12c a (or 12a) along the extending direction thereof, and the above-described tip seal 34 is provided in the groove 43.

As shown in FIG. 1B, the tip seal 34 is provided on the 34c surface facing the bottom surface 43b of the groove 43 so as to face the right high pressure side in the drawing of FIG. 1A. A plurality of cuts are formed and arranged at predetermined intervals on the bottom surface 43b so that the cutouts are opened. In the present embodiment, the chip seal width is formed shorter than the width of the groove 43 in consideration of the assemblability, and the groove 41 is cut in one surface 34d of the chip seal along the extending direction thereof. A sealing member 40 made of an elastic resin material such as silicon rubber, fluorine, or nitrile fits into the groove 41, and the chip seal 34 is fitted into the groove 43 of the wrap 11a in this state.

The tip seal 34 has an upper surface 34 due to a back pressure (floating pressure) at which the discharge fluid in the discharge hole 11d shown in FIG.
Although a is in contact with the mirror surface of the other party to form a closed space, it is difficult to form a closed space if its back pressure is low. However, when the discharge fluid from the high pressure side enters between the chip seal bottom and the chip seal groove bottom in the chip seal groove, the notch opening toward the high pressure side on the chip seal bottom is pushed open and the cut is formed. The entrance comes into contact with the groove bottom surface to generate a floating pressure together with a labyrinth effect between the plurality of cuts, so that the sliding surface 34 on the upper surface of the tip seal is formed.
The contact of a with the mirror surface of the counterpart ensures the formation of a closed space, and prevents the discharge fluid from leaking.

Then, the high pressure side surface 3 of the tip seal 34
When a fluid pressure higher than the low-pressure side surface 34d is applied to the side surface 4d, the wall surface 43a of the chip seal groove 43 and the chip seal side surface 3
4b is separated and a gap is formed. Fluid flowing through the gap leaks to the crescent-shaped compression chamber adjacent to the low-pressure side through the bottom surface and the low-pressure side, but is distributed to the low-pressure side. Since the seal is provided by the provided seal member 40, it does not leak into the crescent-shaped compression chamber adjacent to the low-pressure side, and the fluid flowing into the bottom surface 43b of the chip seal groove is interposed between the notches formed in the bottom surface. Thus, the tip seal sliding surface can effectively function as a floating pressure for pushing up the sliding surface to the other mirror surface.

FIGS. 4, 5 and 6 show the chip seal groove 4.
3 shows the configuration of the end portions, FIG. 4 shows both end portions being open, FIG. 5 shows a case where the low pressure side is closed, and FIG. 6 shows a case where both ends are closed. Things.

As shown in FIG. 4 and FIG.
5, when the high pressure side is closed as shown in FIG. 6, when the tip seal is fitted in the groove as in the conventional example,
The high pressure flowing from the gap between the tip seal 6 and the tip seal end surface causes the tip seal to float and come into contact with the mirror surface of the other end. However, in the present embodiment, as described above, the high pressure side surface 34b of the tip seal 34 is attached to the low pressure side surface 34d.
When a higher fluid pressure is applied, the high-pressure fluid can flow through a gap formed between the wall surface 43a of the chip seal groove 43 and the chip seal side surface 34b.

Further, in the case of the present embodiment, a chip seal having a length smaller than the length of the chip seal groove by a predetermined dimension at room temperature is provided on the high pressure side and the low pressure side of the chip seal groove 43 in consideration of the coefficient of thermal expansion. As described above, even when the chip seal groove is attached to the chip seal groove at a predetermined distance from the ends thereof, the leakage of the fluid to the low pressure side in the chip seal extension direction can be well prevented by the bottom cut as described above.

FIGS. 7, 8, and 9 are views showing the appearance in which a cut is provided on one surface of the chip seal. FIG. 7 shows a chip seal 34A having a cut only on the bottom surface.
Is a tip seal 3 with a cut only on the low pressure side surface.
4B and FIG. 9 show a tip seal 34C in which a cut is provided only on the high-pressure side surface.

When FIGS. 8 and 9 are combined, FIG.
1 and FIG. 12 when combined with FIG. 7 and FIG. 8, and FIG. 1 when combined with FIG. 7, FIG. 8 and FIG.
The appearance is 3.

FIG. 14 shows different seal member grooves 41A-41.
41D, and the sealing members 40A to 40G shown in FIG. 15 can be inserted into these grooves. The low pressure side ends of the hollow circular seal member 40B and the hollow square seal member 40E are shielded.

FIG. 16 shows a state in which each seal member shown in FIG. 15 is inserted into the seal member groove by using the chip seal 34 having the rectangular seal member groove 41A, and inserted into the chip seal groove 43 of the wrap. It is shown. In this state, a gap is formed between the wall surface of the seal member groove and the outer surface of the seal member. However, as shown in FIG. 14, a high-temperature and high-pressure compressed fluid is applied to the tip seal side surface 34b, and the opposite side surface 34d is When the chip seal groove wall surface 43c abuts, the seal member is deformed and expands due to high temperature, so that there is no gap between the wall surface of the seal member groove and the outer surface of the seal member, and fluid leakage from the high pressure side to the low pressure side Is prevented.

In this case, in the case of a seal member in which the low-pressure side end is shielded, high-pressure fluid flows into the hollow portion to cause the seal member to expand with thermal expansion, and the wall surface of the seal member groove and the seal member to expand. There is no air gap between the high pressure side and the outside surface, and leakage of fluid from the high pressure side to the low pressure side is prevented. And
As shown in FIG. 3, assuming that the tip seal groove W, the tip seal width tw, and the projection height y when the seal member is inserted into the seal member groove, 1 =
{(Tw + y) / W} is desirable.

As the degree of (tw + y)> W increases, it becomes more difficult to insert the chip seal set in which the seal member is inserted into the seal member groove into the chip seal groove, and the seal member is formed by the high temperature and high pressure of the compressed fluid. Inflated,
Floating of the tip seal becomes difficult. The shape of the tip seal relative to the width of the tip seal groove of the wrap is affected by the material and shape of the sealing member. That is, when the seal member is hard and solid, (tw + y) = W, and when the elastic force of the seal member is large and hollow, (tw + y) = W.
y) Even if the degree of W is large, the ease of inserting the tip seal set into the tip seal groove is increased.

As a result of various experiments, the present inventor has found that by using the above-mentioned elastic resin material such as silicon rubber, fluorine, or nitrile, by setting 1 ≦ {(tw + y) / W} ≦ 1.2, the chip There was no difficulty in inserting the seal set into the chip seal groove, and good results were obtained in preventing leakage of the compressed fluid.

[0048]

As described above, according to the first aspect of the present invention,
The bottom surface of the chip seal is provided on the bottom surface opposite to the sliding surface that slides with the counterpart mirror surface, and the side surface of the chip seal groove facing the groove wall on the low pressure side space side is formed by the chip seal. A seal member groove to which a flexible seal member can be attached is provided to seal the high-pressure sealed space, so that the high-pressure sealed space does not need to be pressurized, and leakage of the compressed fluid is prevented. In particular, even when the discharge fluid is at a low pressure, the sealing member prevents leakage on the low pressure side space side, so that a floating pressure due to the cut formed on the bottom surface of the chip seal can be reliably generated, and the chip sealing function is improved. Can be.

Also, with this configuration, the chip seal width is not fitted without a gap into the chip seal groove width in order to prevent fluid leakage from the chip seal side surface. The chip seal and the seal member, which is narrower than the chip seal groove width and more flexible than the chip seal, are inserted together, and the chip seal can be easily inserted.

[Brief description of the drawings]

FIG. 1 is a diagram showing one embodiment according to the present invention.

FIG. 2 is a vertical sectional view in the extending direction of FIG.

FIG. 3 is a partially enlarged view of FIG. 2;

FIG. 4 is a schematic structural view showing a first embodiment of the configuration of the end portion of the chip seal groove.

FIG. 5 is a schematic structural view showing a second embodiment of the configuration of the end portion of the chip seal groove.

FIG. 6 is a schematic structural diagram showing a third embodiment of the configuration of the end portion of the chip seal groove.

FIG. 7 is a schematic explanatory view in which a cut is provided only on the bottom surface of the chip seal.

FIG. 8 is a schematic explanatory view in which a cut is provided only on the low-pressure side surface of the tip seal.

FIG. 9 is a schematic explanatory view in which a cut is provided only on the high pressure side surface of the tip seal.

FIG. 10 is a schematic explanatory view in which cuts are provided on the high-pressure side surface and the bottom surface of the chip seal.

FIG. 11 is a schematic explanatory view in which cuts are provided on the high-pressure side surface and the low-pressure side surface of the tip seal.

FIG. 12 is a schematic explanatory view in which cuts are provided on the low pressure side surface and the bottom surface of the chip seal.

FIG. 13 is a schematic explanatory view in which cuts are provided in the high-pressure side surface, the low-pressure side surface, and the bottom surface of the chip seal.

FIG. 14 is a cross-sectional view showing different seal member grooves provided in the tip seal.

FIG. 15 is a sectional view showing a different sealing member.

FIG. 16 is an explanatory view showing a state in which each seal member is inserted into the seal member groove using a chip seal having a rectangular seal member groove, and inserted into the chip seal groove of the wrap.

FIG. 17 is a fragmentary cross-sectional view showing a schematic configuration according to an embodiment of a scroll fluid machine to which the present invention is applied.

18 is a view as viewed in the direction of arrows AA in FIG. 17;

FIG. 19 is a sectional view taken along line BB of FIG. 17;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Scroll fluid machine 34 Tip seal 40 Seal member 43 Tip seal groove 44 Bottom cut

Claims (4)

[Claims] An orbiting scroll is revolved with respect to a fixed scroll by restricting rotation of the orbiting scroll, and mirror surfaces of both scrolls, a wrap implanted on the mirror surface, and a cut-out at an upper end of the wrap are provided. In a scroll fluid machine that compresses or expands a taken-in fluid by a sealed space formed by a tip seal that slides on a mating mirror surface and that is arranged in a tip seal groove, at least a plurality of cuts are formed in a bottom surface of the tip seal. The inlet of the cut is formed in the longitudinal gap in the chip seal groove in an oblique direction toward the flow of the compressed fluid from the discharge side to the suction side, and the compressed fluid enters the longitudinal gap. The tip seal is lifted up from the tip seal groove by opening the notch so that A seal member groove that seals between the sliding surface and the counterpart mirror surface, and on the side surface of the chip seal groove facing the groove wall on the low pressure side space side, a seal member that is more flexible than the chip seal can be attached. Wherein the tip seal groove and the tip seal are sealed by the seal member. 2. The chip seal groove W, the chip seal width tw, and the protrusion height y when the seal member is inserted into the seal member groove, 1 ≦ {(tw + y) / W} ≦ 1.2. 2. The scroll fluid machine according to claim 1, wherein: 3. The chip seal groove according to claim 1, wherein a groove shielding wall is provided at least at a low pressure side end, and the chip seal end is close to or in contact with the groove shielding wall. Scroll fluid machinery. 4. A chip seal attached to the chip seal groove forms a plurality of cuts on one side and / or the other side, and an inlet of the cut forms a longitudinal gap in the chip seal groove on a discharge side. 2. The slit is formed in a direction oblique to the flow of the compressed fluid from the suction fluid to the suction side, and is provided in a direction in which the cutout is opened when the compressed fluid enters the longitudinal gap. Scroll fluid machinery.