JP2815448B2 - Scroll compressor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a scroll compressor, and more particularly to an axial seal using a tip seal.

[Prior Art] A general scroll compressor includes two scroll members in which a spiral body is integrally fixed to one surface of a side plate. These scroll members are combined so that the spirals mesh with each other to form a compression space between the spirals. By rotating these scroll members relatively without rotating, the compression space is compressed while moving toward the center along the spiral. The compressed fluid protrudes from the central discharge hole.

Axial sealing in this type of scroll compressor is usually performed as shown in FIG. In FIG. 7, a sealing groove 2 is formed along the spiral at the axial end of the spiral body 1 of the scroll member, and a spiral-shaped tip seal 3 of the sealing groove 2 is movably arranged in the axial direction. It is. In operation, the fluid of the compression space P _H of the high pressure side is led to the bottom of the sealing groove 2, the side walls of the compression space P _L side of the low pressure side of the side plate 4 and the seal groove 2 of the scroll member opposite the tip seal 3 to To seal the gap 5 between the side plate 4 and the axial end of the spiral coil 1.

[Problem to be Solved by the Invention] Strictly speaking, the side plate 4 of the scroll member has undulations on the surface due to the processing accuracy, as exaggeratedly shown in FIG. Generally, it is unavoidable that a slight error occurs in the parallelism of the side plate 4 of the scroll member during assembly. Such processing accuracy of the side plate 4 and the parallelism at the time of assembling may cause a change in the size of the gap 5 during operation of the compressor.

The tip seal 3 moves minutely in the axial direction in the seal groove 2 following the change in the size of the gap 5. The degree of following in the axial direction cannot be ignored from the viewpoints of sealing performance, wear of the tip seal, and driving efficiency.

At the time of the movement of reducing the gap 5, the force indicated by the symbol R in the stress distribution diagram of FIG. 9 acts, so that when the side plate 4 pushes the chip seal 3 into the seal groove 2, the wear of the chip seal is uneven. It also causes a reduction in the driving effect.

On the other hand, when the gap 5 is increased, the follow-up of the tip seal becomes incomplete due to the frictional force between the tip seal 3 and the side wall of the seal groove 2, and a problem occurs in the sealing performance.

In order to solve these problems, if the entire tip seal is made of a material having good sliding characteristics (abrasion resistance and heat resistance), the cost increases.

Therefore, an object of the present invention is to provide an inexpensive scroll compressor excellent in sealability, wear of a tip seal, and driving efficiency.

Another object of the present invention is to provide an inexpensive scroll compressor excellent in followability of a tip seal.

[Means for Solving the Problems] According to the present invention, a spiral-shaped tip seal is movably disposed in a seal groove formed along the spiral at the axial end of the spiral of one scroll member. A scroll compressor in which the tip seal is urged toward the side plate of the other scroll member by the compression pressure of the fluid to seal between the side plate and the axial end of the spiral. A scroll compressor characterized in that at least one of the outer surface of the seal groove and the outer surface of the tip seal is provided with wear coefficient adjusting means having a friction coefficient smaller than that of the other part.

Further, according to the present invention, a spiral-shaped tip seal is movably disposed in a seal groove formed along the spiral at the axial end of the spiral of one of the scroll members, and the tip is compressed by a fluid pressure. In a scroll compressor in which a seal is urged toward a side plate of the other scroll member to seal between the side plate and an axial end of the spiral body,
A scroll type compressor is characterized in that the relative shapes of the tip seal and the seal groove are set such that the inner surface of the tip seal is pressed against the inner surface of the seal groove.

Further, according to the present invention, a spiral-shaped tip seal is movably disposed in a seal groove formed along the spiral at the axial end of the spiral of one of the scroll members, and the tip is compressed by a fluid pressure. In a scroll compressor in which a seal is urged toward a side plate of the other scroll member to seal between the side plate and an axial end of the spiral body,
A scroll type compressor is provided in which gap forming means for leaving a gap between the outer surface of the tip seal and the outer surface of the seal groove is provided even when the fluid is compressed.

Embodiment FIGS. 1A and 1B show a tip seal used in a scroll compressor according to a first embodiment of the present invention.
In the tip seal 10, a coating 12 is applied to at least the outer surface of a spiral core 11 made of a material equivalent to that of a conventional tip seal to reduce the friction coefficient. The coating 12 may be applied to the entire outer peripheral surface of the core material 11.

On the other hand, the second shows a part of a scroll member used in the scroll type compressor. A seal groove 14 formed along the spiral at the axial end of the spiral 13 of the scroll member
A coating 16 is applied to the outer side surface 15 of the slab to reduce the coefficient of friction. The coating 16 may be applied to the entire inner surface of the seal groove 14.

Further, only one of the outer surface of the tip seal and the inner surface of the seal groove may be coated.

Further, the surface roughness of at least one of the outer surface of the tip seal and the inner surface of the seal groove may be improved by grinding.

In any case, since the frictional force between the outer surface of the tip seal and the inner surface of the seal groove is reduced, it is possible to provide an inexpensive scroll compressor excellent in followability of the tip seal.

FIG. 3 shows a main part of a scroll compressor according to a second embodiment of the present invention in a stopped state. In FIG. 3, the relative shapes of the tip seal 10 and the seal groove 14 are set so that the tip seal 10 is pressed against the inner surface 17 of the seal groove 14 when no external force is applied.

When the scroll compressor is operated, together with the tip seal 10 is widened outward resiliently by the pressure of the compression space P _H of the high-pressure side, is pushed outward of the sealing groove 14, the outer seal groove 14 It comes into contact with the side surface 15 and the side plate 4 to perform a predetermined sealing action. However, the pressing force between the tip seal 10 and the outer surface of the seal groove 14 at this time is relatively reduced due to the restoring force of the tip seal 10 itself. Therefore, the frictional force between the outer surface of the tip seal and the inner surface of the seal groove is reduced, so that it is possible to provide an inexpensive scroll compressor excellent in followability of the tip seal.

FIG. 4 (a) shows a main part of a scroll type compressor according to a third embodiment of the present invention in a stopped state, and FIG. 4 (b).
Indicates the operating state. In FIG. 4 (a), the seal groove 14 has a bottom surface and a side surface formed at right angles to each other, whereas the tip seal 10 has an inverted trapezoidal cross section.

When the scroll compressor is operated, the tip seal 10 by the pressure of the compression space P _H of the high-pressure side is widened outward resiliently. However, as shown in FIG. 4 (b), a gap 18 is left between the inner surface of the tip seal 10 and the inner surface 15 of the seal groove 14.
It acts as a force for inward pressure P _H is, as a result, press and spread force of the tip seal 10 is reduced. Therefore, the frictional force between the outer surface of the tip seal and the inner surface of the seal groove is reduced, so that it is possible to provide an inexpensive scroll compressor excellent in followability of the tip seal.

As the tip seal 10, one having various cross-sectional shapes as shown in FIGS. 5 (a) to 5 (c) can be used.

Further, as shown in FIG. 6 showing a scroll type compressor according to a fourth embodiment of the present invention, the tip seal 10 has a rectangular cross section, but the seal groove 14 has the same shape even if the bottom is made wide. Action can be obtained. Of course, various modifications can be made to the shape of the seal groove in this case.

Although various embodiments have been described above, it is needless to say that the present invention is not limited to these embodiments, and various modifications such as appropriate combinations of these embodiments are possible.

[Effects of the Invention] As described above, according to the present invention, there is provided an inexpensive scroll compressor which is excellent in followability of a tip seal and therefore exhibits excellent characteristics in sealability, wear of the tip seal, and driving efficiency. Can be provided.

[Brief description of the drawings]

FIG. 1 shows a tip seal used in a scroll compressor according to a first embodiment of the present invention, wherein (a) is a plan view,
FIG. 2B is a cross-sectional view, and FIG. 2 is a cross-sectional view showing a part of a scroll member used in the scroll compressor. FIG. 3 is a sectional view showing a main part of a scroll type compressor according to a second embodiment of the present invention in a stopped state. 4A and 4B show a main part of a scroll compressor according to a third embodiment of the present invention, wherein FIG. 4A is a cross-sectional view in an operation stopped state, FIG. FIGS. 4A to 4C are cross-sectional views showing various examples of the tip seal used in FIGS. FIG. 6 is a sectional view showing a scroll compressor according to a fourth embodiment of the present invention. 7 to 9 are explanatory diagrams of a conventional scroll compressor. 10 ... tip seal, 11 ... core material, 12 ... coating, 13 ... spiral wound, 14 ... seal groove, 15 ... outer surface,
16 ... coating, 17 ... inner surface, 18 ... gap.

Claims (3)

(57) [Claims] 1. A spiral-shaped chip seal is movably disposed in a seal groove formed along the spiral at an axial end of the spiral body of one of the scroll members, and the chip seal is compressed by a fluid pressure. An outer surface of the seal groove and the tip seal are provided in a scroll-type compressor in which a side plate of the other scroll member is urged toward a side plate to seal between the side plate and an axial end of the spiral body. A scroll compressor characterized in that at least one of an outer surface and a friction coefficient adjusting means having a friction coefficient smaller than that of the other portion is provided. 2. A spiral-shaped chip seal is movably disposed in a seal groove formed along the spiral at the axial end of the spiral body of one of the scroll members, and the chip seal is compressed by a fluid pressure. In a scroll type compressor in which a seal is provided between the side plate and the axial end of the spiral body by biasing toward the side plate of the other scroll member, the inner surface of the tip seal has the seal groove. A scroll type compressor characterized in that the relative shapes of the tip seal and the seal groove are set so as to press against the inner surface of the scroll. 3. A spirally wound tip seal is movably disposed in a seal groove formed along the spiral at the axial end of the spiral of one of the scroll members, and the tip seal is compressed by a fluid pressure. In a scroll type compressor configured to urge toward a side plate of the other scroll member to seal between the side plate and an axial end portion of the spiral body, an outer surface of the chip seal also when a fluid is compressed. And a gap forming means for leaving a gap between the scroll compressor and an outer surface of the seal groove.