JP2001123970A - Seal member and scroll-type fluid machine using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve scroll compressor performance by preventing leakage from a tip seal to be used for the tip of a scroll lap of a scroll compressor. SOLUTION: A seal member 21 is mounted in a recessed groove formed on the upper surface of a vortex part of a scroll-type fluid machine. The start position of a cut of a first surface 22 in which the seal member is brought into contact with the recessed groove bottom surface and the start position of a cut of a second surface 23 on the high pressure side of working fluid of the seal member are made to substantially coincide with each other. The first surface is cut at angle of 91 to 105 deg. in the working fluid leaking direction by taking the second surface as a reference. The second surface is cut at angle of 91 to 105 deg. in the working fluid leaking direction by taking the surface on the opposite side to the first surface as a reference.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal member suitable for a refrigerant compressor used in, for example, an air compressor or an air conditioner, and a scroll compressor using the same.
The present invention relates to a seal member for preventing a working fluid from leaking from a swirl portion of an orbiting scroll and a fixed scroll, and a scroll fluid machine using the same.

[0002]

2. Description of the Related Art In a scroll type fluid machine, a plurality of compression chambers formed between respective vortex portions of a fixed scroll and an orbiting scroll are continuously reduced by the orbiting motion of the orbiting scroll, and are sucked from a blow port. The fluid is discharged from the discharge port while the fluid is sequentially compressed in each compression chamber.

At this time, there is a pressure difference in each compression chamber, and since there is a gap in each compression chamber due to the structure, there is leakage of the fluid to be compressed from each compression chamber. There is a big difference in the performance of fluid machinery. One effective means for preventing this leakage is to form a concave groove on the upper surface of the vortex of the orbiting scroll and the fixed scroll, and to mount a seal member in this groove to be in sliding contact with the bottom surface of the counterpart vortex.

In order to prevent leakage of the fluid to be compressed by the seal member, it is necessary to press the seal member against the bottom surface of the counter vortex. There is a method of inserting a spring, or a method of making the seal member an elastic body and pressing it with its elastic force as disclosed in Japanese Patent Application Laid-Open No. 8-114188, but it is practical.
An effective method is a method that utilizes the pressure difference between the fluids to be compressed in the adjacent compression chambers.

However, in the method of utilizing the pressure difference between adjacent compression chambers, the compression mechanism of the scroll fluid machine uses a groove on the upper surface of the vortex in the compression chamber near the suction port where the pressure difference between the compression chambers is small. If the leakage of the compressed fluid from the gap between the tip seal is large, a further pressure difference cannot be made,
The force for pressing the tip seal against the bottom surface of the counter vortex hardly acts, so that the fluid to be compressed leaks from between the bottom surface of the counter vortex and the tip seal, which may degrade the performance of the scroll type fluid machine. There is. Further, according to this method, the fluid to be compressed leaks from a gap between the concave groove on the upper surface of the vortex and the tip seal, and there is a possibility that the performance of the scroll-type fluid machine is reduced.

Therefore, in order to solve the above-mentioned problems,
For example, Japanese Utility Model Laid-Open No. 2-147787, Japanese Utility Model Laid-Open No. 2-1.
As disclosed in JP-A-47888 and JP-A-3-11101, a plurality of cuts are made on the side and bottom sides of the seal member in the longitudinal direction of the seal member so as to be separated from each other in the longitudinal direction of the seal member. A plurality of side lips and a plurality of bottom lips are formed on the sides to prevent leakage of the compressed fluid.

Further, in order to solve the problem that the force for pressing the tip seal against the bottom surface of the mating vortex hardly acts in the compression chamber near the suction port, for example, Japanese Patent Application Laid-Open No. 8-93 is disclosed.
In US Pat. No. 669, no cut is made in the side surface of the tip seal near the suction port, the resistance of the tip seal to move is reduced, and the tip seal is pressed against the bottom surface of the counterpart vortex.

[0008]

However, the above-mentioned prior art has the following disadvantages as described with reference to FIGS. FIG. 1 shows a state of sealing the fluid to be compressed by the tip seal. The tip seal 3 is pressed against the bottom surface 7 of the vortex on the other side by the pressure difference of the fluid to be compressed, and closes the gap between the top surface 6 and the bottom surface 7 of the vortex. With this,
The lips 4 and 5 formed by the cuts made in the chip seal 3 contact the grooves 8 on the upper surface 6 of the vortex, close the gap between the grooves 8 and the chip seal 3, and prevent leakage of the fluid to be compressed. I have. However, as shown in FIG. 2, if the cut positions of the side and bottom surfaces of the tip seal 21 are apart from each other, the compressed fluid may leak from the gap 25 between them, and if it does, the performance of the scroll type fluid machine may be reduced. Decrease.

If the cut positions of the side surface and the bottom surface of the tip seal are made to coincide with each other as shown in FIG. 3, this fear can be eliminated. However, even in this case, the lips 26 and 27 formed by each cut are provided. The fluid to be compressed may leak from between the two, and if it leaks, the performance of the scroll fluid machine is reduced. Further, as described above, when the compressed fluid leaks from between the lips 26 and 27 formed by the cuts of the tip seal, the compressed chambers near the suction port where the pressure difference of the compressed fluid is originally small are compressed. There is almost no pressure difference between the fluids. In this case, the tip seal 21 is not pressed against the bottom surface of the other vortex, and there is a possibility that the compressed fluid leaks from the bottom surface and the top surface of each vortex.

The present invention has been made in view of the above-mentioned disadvantages of the related art, and has as its object to improve compressor performance by preventing leakage from a tip seal.

[0011]

A first feature of the present invention to achieve the above object is to provide a scroll type fluid machine which is mounted in a groove formed on an upper surface of a vortex portion of a scroll type fluid machine. In the seal member of the machine, a starting position of the cut of the first surface where the seal member contacts the concave groove bottom surface;
The starting position of the cut of the second surface on the high-pressure side of the working fluid of the seal member is substantially coincident with the first surface, and the first surface has an angle of 91 to 105 degrees in the direction in which the working fluid leaks with respect to the second surface. The cut is formed at an angle, and the second surface is formed in the direction in which the working fluid leaks with respect to the surface opposite to the first surface.
The cut has an angle of 1 to 105 degrees.

[0012] Preferably, the first surface of the seal member is 0.1 at the lower pressure side of the working fluid at the higher pressure side.
The second surface is 0.1 to 0.1 mm deeper on the side opposite to the first surface than the first surface.
It is a 3 mm deep cut.

A second feature of the present invention to achieve the above object is a seal member of a scroll type fluid machine which is mounted in a groove formed on the upper surface of a vortex portion of the scroll type fluid machine. When forming a cut in one of the first surface where the seal member contacts the concave groove bottom surface and the second surface on the high pressure side of the working fluid of the seal member, and forming the cut in the first surface, Cut in the direction in which the working fluid leaks at an angle of 91 to 105 degrees with respect to the second surface,
Is formed at an angle of 91 to 105 degrees in the direction in which the working fluid leaks with reference to the surface opposite to the first surface.

A third feature of the present invention to achieve the above object is that any one of the above seal members is used in a crawl type fluid compressor.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. FIG. 4 is a partially enlarged perspective view of the tip seal. The cutting start position of the surface (first surface) 22 of the chip seal member 21 opposite to the surface in contact with the bottom surface of the counterpart vortex, and the surface of the chip seal member 21 on the high pressure side of the compressed fluid (second surface). ) The cutting start position of 23 is matched with the surface 22 opposite to the surface of the tip seal member that contacts the bottom surface of the mating vortex, and the direction in which the compressed fluid leaks based on the high-pressure surface 23 of the compressed fluid. At an angle of 91 to 105 degrees. Further, the tip seal member has a surface 23 on the high pressure side of the compressed fluid at an angle of 91 to 105 degrees in a leak direction of the fluid to be compressed with reference to the bottom surface of the counterpart vortex and the surface on the contact side,
A chip seal member with a cut is formed.

As another example, the surface 22 of the tip seal member 21 opposite to the surface in contact with the bottom surface of the counter vortex has a surface on the low pressure side of the compressed fluid higher than the surface 23 on the high pressure side of 1 to 0. .3
The surface 23 on the high-pressure side of the compressed fluid of the chip seal member and the chip seal member 21 which has been cut deeper by a depth of 0.2 mm is in contact with the bottom surface of the mating vortex from the surface 22 opposite to the bottom surface of the mating vortex. A tip seal member is provided with a notch deeper on the side of 0.1 to 0.3 mm.

When the tip seal has such a shape,
As shown in FIG. 4, the rising of the lip formed by the cut is inclined toward the non-contact side of the groove in which the chip seal is placed, so that the leakage area 5 between the lip formed on the side surface and the bottom surface of the chip seal is 50. The chip seal is pressed against the bottom surface of the other vortex in each compression chamber near the suction port where the pressure difference of the compressed fluid is small, and the leakage of the compressed fluid is further reduced. And the performance of the scroll fluid machine can be improved by 3 to 5%.

If the tip seal is cut at an angle greater than the above or if the tip seal has a greater depth difference than the above, the force of the fluid to be compressed causes the tip seal to separate from the bottom surface of the counterpart vortex. Works, the contact area between the tip seal and the bottom surface of the mating vortex is reduced, and the performance of the scroll fluid machine is reduced.

The above embodiment will be described more specifically below. FIG. 5 shows the scroll vortex portion 28 and the tip seal 21 attached thereto. FIG. 6 shows an enlarged view of the tip seal 21. As shown in FIG. 6, the start position of the cut on the first surface 22 of the chip seal member and the start position of the cut on the second surface 23 of the chip seal member are matched, and the first position of the chip seal member 21 is A cut is formed in the surface 22 at an angle of 91 to 105 degrees in the leak direction of the compressed fluid as the working fluid with respect to the second surface 23. A cut is made in the second surface 23 of the tip seal member 1 at an angle of 91 to 105 degrees in the direction in which the fluid to be compressed leaks with respect to the surface opposite to the first surface. As a result, the lip formed by the cut is inclined toward the non-contact side of the concave groove in which the chip seal is provided, and the leakage area 5 between the lips formed on the two surfaces of the chip seal is reduced by 50 to 70%, and Compressed fluid leakage can be reduced, and the tip seal is pressed against the bottom surface of the counterpart vortex in each compression chamber near the suction port where the pressure difference of the compressed fluid is small, preventing leakage of the compressed fluid, and scroll type fluid machinery. Can be improved by 3 to 5%.

[0020]

According to the present invention, the performance of the scroll-type fluid machine can be improved because the seal member mounted in the groove at the tip of the vortex of the scroll-type fluid machine reduces leakage of the fluid to be compressed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing details of a tip seal portion of a scroll fluid machine according to the present invention.

FIG. 2 is a partial perspective view of a conventional tip seal.

FIG. 3 is a partial perspective view of a conventional tip seal.

FIG. 4 is a partial perspective view of an embodiment of the tip seal according to the present invention.

FIG. 5 is a partial perspective view of a vortex portion of the scroll fluid machine according to the present invention.

FIG. 6 is a partial perspective view of one embodiment of the tip seal according to the present invention.

[Explanation of symbols]

Reference numeral 11 denotes a swirl portion of the orbiting scroll, 12 denotes a swirl portion of the fixed scroll, 13 denotes a tip seal, 14 denotes a lip, 15 denotes a lip, 16 denotes a top surface of the vortex, 17 denotes a bottom surface of the vortex, 18 denotes a concave groove, and 2
1: tip seal, 22: first surface, 23: second surface,
24: groove, 25: leakage area, 28: scroll vortex.

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Tatsuchi Nishihara 390 Muramatsu, Shimizu-shi, Shizuoka F-term in the Industrial Machinery Group, Hitachi, Ltd. (Reference) 3H029 AA02 AA12 BB16 BB43 CC05 CC19 3H039 AA03 AA12 BB07 BB15 BB28 CC02 CC03 CC05 CC31

Claims (4)

[Claims] 1. A seal member for a scroll-type fluid machine mounted in a groove formed on an upper surface of a vortex portion of the scroll-type fluid machine, wherein the seal member contacts a bottom surface of the groove. And the start position of the cut of the second surface on the high pressure side of the working fluid of the seal member are substantially matched, and the first surface is provided with the working fluid based on the second surface. A notch is formed at an angle of 91 to 105 degrees in a leaking direction, and the first surface is formed on the second surface.
A sealing member formed with a cut at an angle of 91 to 105 degrees in a direction in which the working fluid leaks with reference to a surface opposite to the surface. 2. The first surface of the seal member is formed so that the surface on the low pressure side is deeper by 0.1 to 0.3 mm than the surface on the high pressure side of the working fluid, and the second surface is 2. The seal member according to claim 1, wherein the surface opposite to the first surface is cut deeper by 0.1 to 0.3 mm than the first surface. 3. A seal member of a scroll type fluid machine mounted in a groove formed on an upper surface of a vortex portion of the scroll type fluid machine, wherein the seal member contacts a bottom surface of the groove. And a notch is formed in any one of the second surface on the high-pressure side of the working fluid of the seal member, and when the notch is formed in the first surface, the direction in which the working fluid leaks with respect to the second surface. Cut at an angle of 91 to 105 degrees, and when forming the cut in the second surface, cut at an angle of 91 to 105 degrees in the direction in which the working fluid leaks with reference to the surface opposite to the first surface. A seal member characterized by the above-mentioned. 4. A scroll-type fluid compressor using the seal member according to claim 1.