JPS58214689A - scroll fluid machine - Google Patents

Abstract

PURPOSE:To improve reliability on a compressor which is adapted to run at a high speed, by forming a compression chamber with a lap and a mirror plate made of ceramic to prevent the occurrence of deformation due to the compression heat. CONSTITUTION:A metal protecting member 18 is attached to the back of a mirror plate 17a as in a stationary scroll. Further, a bearing 19 made of ceramic for supporting a crank shaft is integrally joined to the center of the back of the mirror plate 17a. Since the bearing 19 is thus made of ceramic, reliability on the bearing can be improved by virtue of an extremely high wear resistance of the ceramic.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a scroll fluid machine used for air conditioning, air, general gas, non-lubricated compressor-expanders, and the like.

As shown in Fig. 1, a conventional fluid machine of this type is attached to a frame, and has a head plate 1a with suction ports 1 and 3 on the outer periphery and a discharge port 4 in the center, and a vertical plate on the head plate 1a. A fixed scroll 1 consisting of a spiral wrap 1b provided at the top, an end plate 2a with an Oldham ring 6 and a crank bin 8 attached to the back, and this @l)v' 2
Wj consisting of a spiral wrap 21) provided perpendicularly to a
Ii times cross scroll 2 phases are shifted and both sides Ib
, 2b interlockingly combined 11? Consisting of j1 shield, n1TN self Oldham ring 6 is 1-7 through key 7
Crankbin 8iJ attached to 1,000 frame 6 and twisted: +
Supported by 咄 ntlil, iib, /-
It is installed on the main shaft 9 which is sealed by the
I'm blown away. Attached to the main shaft 9 are balance ways r1 and 10 for balancing the unbalanced rotation of the orbiting scroll 2.

When the main shaft 9 is rotated, the crank bin 8 attached to the upper 11ζ119 is rotated. Since the orbiting scroll 2t and J are rotated and revolved around each other via the Oldham ring 6, the gas sucked from the suction boat 1 flows into the compression chamber 12. Since this compression chamber 12 is sequentially reduced in size as the orbiting scroll 2 turns IIIIIIIII, the gas flowing into the IEiii: volume 12 is gradually compressed accordingly.

In the above-mentioned Tanizumi cedar compression shingle, the sealing performance of the lap portions of both scrolls is always required, but the sealing performance may not be fully satisfied because it is subject to deformation due to gas pressure and shadow 4 due to thermal expansion. Also, while driving, both laps,
Since the sliding surface of J2b wears, sufficient sealing performance cannot be obtained. Furthermore, since both scrolls are made of conventional 1.2II metal plates, it is impossible to avoid sliding abrasion of the two scrolls ib and 2b.

Therefore, in order to maintain good performance as a compressor, the compression gap must be set appropriately over the entire compression gap. v
l: It is necessary to maintain its sealing properties. For this reason, it has been proposed to provide a softening Iso, which is softer than the base material, on the optical surface of both wraps of both scrolls, and to ensure sealing performance by the conforming effect caused by sliding. However, this 3L countermeasure is not perfect for all uses, so it depends on the use...

The softened layer must be selected accordingly. Although the degree of loose wear is somewhat reduced, there is a problem in ensuring long-term reliability, and furthermore, as compressors become faster and oil-free, the sliding wear of the wrap is the most serious problem. And this is an important problem. In addition, there are problems in reducing centrifugal force in the case of continuous use, and in making oil-free, reduction in thermal expansion and heat conduction to other parts.

In general, even if the gap in the silk chamber is made smaller, if thermal and fluid leakage is reduced, a high compressibility can be obtained. However, in the conventional extra end 4'' stone: 1:, H-La r1 chamber ej, I-E thermal deformation due to compression heat due to shrinkage d:! mouth 7, also inside il
Since it deforms due to the gas pressure of 1, it is necessary to take this into account when performing all of these i#m machining operations.

For this reason, it is a general idea in rotary, screw, and one-hole type pressurizing machines to make the dimensions of the entire compression chamber slightly smaller than the theoretical value. However, although both laps in the compression chamber are not in contact in static conditions, in reality it is extremely difficult to manage the gap in the compression chamber, and sliding wear is prevented after the compressor is turned over. One way to counter this is to form a softening layer on the surface of the wrap as described above.
Such a compressor not only has the above-mentioned drawbacks, but also allows foreign matter to enter the compression chamber, making it extremely difficult to maintain an appropriate clearance over a long period of time.

In view of the above, the present invention provides high efficiency, long life, high speed,
The purpose is to make the compressor oil-free and lightweight, and improve the single shaft performance of the compressor. It is characterized by being made of a non-metallic inorganic material, that is, ceramic, which is made of ceramic.

Hereinafter, embodiments of the present defense will be described with reference to the drawings.

In FIG. 3, 13 has a suction boat 14a on the outer periphery,
A fixed scroll consisting of an end plate 13a provided with a discharge boat 15a in the center, and a spiral wrap 13b provided vertically on this end plate 13a, and this fixed scroll 13 is entirely or partially subjected to a high-pressure treatment. It is manufactured from non-metallic inorganic materials, so-called ceramics. As this ceramic, for example, alumina (A I4 (')3)
System oxide, silicon carbide (S + C) thread carbide 4A and a half:
1. Vacuum silicon (S + 3 N4) - also &, l nitride 1. Silicon (l(N)-based nitride material) is used.

16 is a gold plate 111X which is connected to the mirror plate 13a by shrink fitting, press fitting, joining, etc. so as to cover the back side of the protective member 16.
A suction boat 14b and a discharge boat 151) are provided on the suction boat 1.4a and the discharge boat 15a of the Tb plate 13a, and a plurality of suction boats 14b and a discharge boat 151) are provided to fit into the plurality of recesses 13a provided in the end plate 13a. protrusion 1
6a is provided. The recess 13a and the protrusion 16a
By fitting with the fixed scroll 13 and the N4M member 1
Positioning in the rotational direction of 6 is performed.

Figure 4 shows a rotating frame 1]~le made entirely of ceramics, and a part of the strainer 1 is made of ceramics. II ("It consists of a mulch-shaped wrap 17b, and a metal protection member 18 is attached to the back surface of the ψ root 17a, similar to the fixed scroll 13.-!

A ceramic bearing 19 that supports a crankshaft (not shown) is integrally connected to the center of the back surface of the holding plate 17a. Since the bearing 19 is made of ceramics in this way, the reliability of the bearing can be improved due to the great wear resistance of ceramics.

By combining the above-mentioned fixed scroll and orbiting scroll,
The scroll fluid machine of this embodiment is constructed by:
The structure is the same as the one-height example shown in FIG. 1, so the drawing is omitted. In this case, the protective element 16.18 serves to substantially reinforce the mechanical strength of the ceramic drawing scroll 13.17. In this embodiment, the protective member 16. Although the scroll fluid machine has been described with reference to the IS, it goes without saying that the scroll fluid machine may be constructed of a fixed scroll made of ceramics and an orbiting scroll to which the protective member is not attached.

Another embodiment of the orbiting scroll shown in FIG. 5 includes an orbiting scroll 17 made of a ceramic end plate 17a and a wrap 17b, which is integrated with a metal protection member 18;
A normal metal bearing 20 is provided in the center of this abscess part 18.

With this configuration, the compression heat of the moon degenerate (not shown) is blocked by the ceramic bone plate 17a, and the bearing 20
Since the temperature of the bearing 20 is prevented from increasing and the lubricating oil is introduced with high viscosity, the reliability of the bearing 20 is improved by 1.
7j It is possible to torture two people with two mouths.

Also, when the Oldham ring 21 provided to prevent rotation of the orbiting scroll 17 slides, there is the same Luga effect as in the bearing 20.

In another example shown in FIG. 6, ceramics 1-22 are provided on the surfaces of the wraps 13b and 17b of both scrolls,
This not only improves wear resistance but also makes it easier to manage the gap between the lap parts. 1dalap and 1lI
Even if the ceramics 1- are provided only on both sides of the mirror plate or on the surface of the lap side steel plate, the same effect as described above can be obtained.

As explained above, according to the present invention, the wraps forming the compression chambers, l:bi! # Since the plate is made of ceramics (9), there is no deformation due to compression heat, and appropriate gap management is possible, so it maintains high compression efficiency over a long period of time and is also resistant to high speed compressors. Improve reliability
can be made to Furthermore, even if foreign matter enters the sliding portion, there is a high risk of seizure and abrasion, and the sliding reference surface is maintained for a long period of time. Furthermore, since there is no risk of heat inside the compression chamber leaking to the outside, it prevents the temperature of other sliding members in the entire structure from rising and maintains the lubricating oil at a high viscosity, improving the reliability of the sliding members. can. To summarize the above, the present invention can easily solve various problems such as improving compressor efficiency, increasing service life, increasing speed, making oil-free, and reducing weight, which were considered extremely difficult with conventional technology. The performance and reliability of the machine can be improved.

[Brief explanation of the drawing]

1 and 2 are longitudinal cross-sectional views of a conventional scroll fluid machine and a plan view showing the shape of its wrap, and FIGS. 3 and 4 are a fixed scroll and a top view showing an embodiment of the scroll fluid machine of the present invention. Rotation (10) No. 14 of the orbiting scroll "Top view, Figure 5 t" Another real noise lj f+lJ orbiting scroll 1 (I
Figure Iil''+i and Figure 6 are other fruits related to the present invention)+
FIG. 3 is a cross-sectional view of a wrap of fli IP:I. 13...Fixed scroll I'l-roll, 17...Orbiting scroll, 13a, I7a...4jfkl!
tf, 13 b, 17 b-7 tp, 16.18・
・・Circulation part), J', 19, 20... Bearing, 2
2 (11) Tomi 1 Unillustrated 3 Figure 4 Figure 7

Claims (1)

[Scope of Claims] 1. In a scroll fluid machine that combines a fixed scroll consisting of an end plate and a spiral wrap provided vertically on the end plate and an orbiting scroll, all or part of both or one of the scrolls, A scroll fluid machine characterized by being manufactured from non-metallic inorganic material subjected to high temperature treatment. 2. Alumina (A/!40
3) Claim 1 characterized in that a silicon carbide (SiC) thread carbide material, silicon nitride (Si3N4) or boron nitride (BN) based nitride material is used.
Scroll fluid machine as described in section. 3. The scroll fluid machine according to claim 1 or 2, wherein the surfaces of both scrolls opposite to the lap are coated with a metal material. 4. The scroll fluid according to any one of claims 1 to 3, wherein the orbiting scroll and its bearing are made of a non-metallic inorganic material subjected to high temperature treatment, and the two are integrally constructed. machine. 5. A coating layer made of a non-metallic inorganic material subjected to high temperature treatment is provided on the surface of the wrap of both scrolls made of Kinki material, the surface of the bell plate of the wrap, or both surfaces of the wrap and the wrapper. A scroll fluid machine as claimed in the claim.