JPS6345485A - Scroll type compressor - Google Patents

Abstract

PURPOSE:To obtain the lightweight swirl scroll having high abrasion resistance by forming the swirl scroll from aluminium alloy and forming a part of the slidable part from the material containing the fiber or the porous body mainly made of SiC or alumina. CONSTITUTION:A swirl scroll 17 is formed by filling the mold in the lap top edge 17d and lap side edges 17e and 17f with the metal porous body into which the fiber mainly made of SiC or carbon fiber or Ni, etc. is diffusion-impregnated and then casting aluminum alloy by introducing the molten metal. Since, with such constitution, the main constituent of the constitution material of the swirl scroll 17 is aluminium, weight can be reduced, and since the fiber or the metal porous body having the superior abrasion resistance is casted into the slidable part, the abrasion resistance can be improved markedly.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a scroll compressor used in a refrigeration cycle or the like, and particularly relates to reducing the weight and improving the strength of the scroll.

Conventional technology The conventional configuration will be explained with reference to FIG. 9 and FIG. 1o.

1 is a sealed casing, 2 is an electric motor section, and on the top there are a block 3, a fixed scroll 4, an orbiting scroll 5,
A mechanical part main body 7 constituted by an anti-rotation mechanism 6 is fixed. The fixed scroll 4 is composed of an end plate 4a and a flap 4b having a uniform thickness and an involute or a curve similar to an involute standing upright on the end plate 4a,
It is fixed to the block 3 with a mirror plate 4a. Further, the orbiting scroll 5 is constituted by a wrap 5b that stands upright on an end plate 5a and an end plate 6a, and has the same curve as the wrap 4b of the fixed scroll 4, and is restrained by an anti-rotation groove 6 on the end plate 5a. The fixed scroll 4 and the orbiting scroll 5 each have a winding end 4 b' of each wrap 4b, sb,
5 b' are aligned by a certain angle.

8 is a discharge hole, 9 is a suction hole, the discharge hole 8 is provided in the center of the involute of the fixed scroll 4, the suction hole 9 is provided in the outer edge of the end plate 4a of the fixed scroll 4, and the suction hole 9 is provided in the suction chamber 9a. It communicates with

10 is a protrusion provided on the surface of the orbiting scroll 6 opposite to the wrap 5b, and is concentric with the upper middle of the involute of the wrap 6b. Reference numeral 11 denotes a shaft supported by the block 3, and the protrusion 10 of the orbiting scroll 5 is accommodated in a boss portion 11a provided at the end on the side of the main body T of the machine section and eccentric from the center of the shaft. are connected.

Further, reference numeral 11b denotes an oil supply passage, which communicates the boss portion 11a with the lower part of the sealed casing 1. 12 is the orbiting scroll 6
The suction chamber 9a is a space formed in front of the mirror plate 4a.
, Sa are communicated via a clearance A.

Reference numeral 13 designates a compression base, and reference numeral 14 designates a thrust holding mechanism (such as a ball bearing) that contacts the plate 5a on the opposite side of the orbiting scroll 6. 15 is a suction pipe communicating with the suction hole 9, and 16 is a discharge pipe.

Next, the compression mechanism of the scroll compressor will be explained. The rotational movement of the shaft 11 accompanying the rotation of the electric motor section 2 is transmitted to the orbiting scroll 5 via the boss section 11a and the protrusion section 1o, but due to the action of the rotation prevention mechanism 6, the orbiting scroll 6 does not rotate on its own axis and remains fixed scroll. It makes a turning movement with the center of the involete of No. 4 as the turning center. At this time, the winding end 5d of the wrap 5b of the orbiting scroll 5 is the wrap 4b of the fixed scroll 4, and the winding end 4b' of the wrap 4b of the fixed scroll 4 is the wrap 6 of the orbiting scroll 5.
Inhalation is complete when the orbiting scroll 5 is in contact with each other, and as the two contact points of the wraps 4b and 5b approach the center of the inlet 1), the pressure in the compression space 13 increases. rises.

Compression mechanism of this scroll compressor: By the way, suction pipe 15
The refrigerant sucked in through the suction hole 9 is compressed and once discharged into the sealed casing 1 through the discharge hole 8, and then discharged through the discharge pipe 16 to a cooling system (not shown). .

During this compression stroke, the end plates 4a, 5a and wraps 4b, sb of the fixed scroll 4 and the orbiting scroll 6
Deformation occurs due to pressure load and thermal load. Further, the chain plate 6a of the orbiting scroll 5 slides in contact with the rotation prevention mechanism 6, the end plate 4a of the fixed scroll, and the tip of the wrap 4b of the fixed scroll, and the protrusion 1Q slides in contact with the boss portion 11a of the shaft 11. Further, the end plate 4a of the fixed scroll 4 contacts and slides with the end plate 5b of the orbiting scroll 5 and the tip of the wrap 5a.

However, as for the material of the orbiting scroll 5, ferrous metals such as cast iron are conventionally used, but especially when rotating a scroll compressor at high speed using an inverter drive device, etc., it is necessary to reduce the centrifugal force of the orbiting scroll 5 as much as possible. Therefore, it was necessary to use an aluminum alloy instead of iron-based metals, which have a heavy specific gravity.Therefore, it was necessary to reduce deformation and improve the wear resistance of each sliding part. When using an alloy orbiting scroll,
In order to compensate for the lack of strength, it is common practice to strengthen all parts of the head plate and wrap with carbon fiber, as shown in Japanese Patent Publication No. 60-216970, and to improve the abrasion resistance by 1Iit by applying alumite surface treatment. be.

Further, when the orbiting scroll 5 is made of an aluminum alloy, the fixed scroll 4 is also generally made of an aluminum alloy in order to have the same coefficient of thermal expansion.

Problems to be Solved by the Invention In such conventional methods, when an orbiting scroll made of aluminum alloy is entirely reinforced with carbon fiber, only the aluminum alloy is gravity cast.

Compared to products produced by high-pressure die casting, vacuum casting, or low-pressure casting, fibers are present throughout, which causes problems such as poor flow of the molten metal, especially in the lap area, and non-uniform structure. This applies not only when reinforcing the entire scroll with carbon fibers, but also when reinforcing an aluminum alloy with silicon carbide or alumina fibers or metal porous bodies.

In addition, when the entire scroll is reinforced with these silicon carbide or alumina fibers or metal porous bodies, the specific gravity becomes heavier than when only aluminum alloy is used, and the centrifugal force of the orbiting scroll increases, causing damage to the protrusions and shaft of the orbiting scroll. There was a problem that the bearing load between the two was large.

Furthermore, a method of increasing wear resistance by applying surface treatment such as alumite to the surface of an aluminum alloy does improve wear resistance, but the surface treatment film thickness is at most 1Q to 30μ.
Since the material is thin and the surface treatment method does not improve the strength of the material itself, there is a problem in ensuring reliability under high loads.

The present invention solves the problems of the conventional examples described above, and improves the wear resistance of the sliding parts of orbiting scrolls and fixed scrolls compared to the case of using only aluminum alloys, and also improves the strength of the material. In particular, the weight of the orbiting scroll that performs the orbiting motion is brought closer to that of aluminum alloy alone, reducing the bearing load, and the reliability is improved by improving the flow of molten metal during manufacturing to obtain a uniform structure. It is.

Means for Solving the Problems The present invention provides an aluminum alloy containing fibers mainly composed of silicon carbide or alumina, carbon fibers, or metal porous bodies only in the sliding parts of the orbiting scroll or the fixed scroll. It is something that forms.

Effect The present invention has the above-described configuration, so that even when rotating at high speed with an inverter drive device, the orbiting scroll is made of fibers containing silicon carbide or alumina as a part of the aluminum alloy, a porous metal body, and carbon fibers. Because it only includes one of these elements with the minimum necessary thickness, the weight is almost the same as when it is made only of aluminum alloy, and the centrifugal force caused by the rotational movement is reduced, so the bearing load can be reduced.

However, the main component of the sliding part is silicon carbide, which has good wear resistance. The palm is worn out because it contains hawk fibers, which are electric fibers mainly composed of lycus or alumina, metal porous bodies, and carbon-like fibers:
As it disappears, the strength of the included portion is improved and a more uniform structure is obtained, which has the effect of improving reliability.

Example An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

Note that the same parts as in the conventional example are given the same reference numerals and will be explained. In addition, the shaded area in the figure indicates the part where fibers or porous metal bodies are cast.
is an orbiting scroll, and has an end plate 17aK, an upright wrap 17b and a protrusion 17c having the same shape as the conventional one. The orbiting scroll 17 is formed by gravity casting, vacuum casting, or high pressure die casting.

The material is molded by low-pressure casting or high-pressure forging (molten metal forging, etc.) and then machined. However, the material is molded with carbonization in the mold at the wrap tip 17d, wrap side surfaces 17o, and 17f, which are indicated by diagonal lines in the figure. Fibers whose main component is silicon SiC,
That is, a porous body made of whiskers or alumina A22O3-based fibers or carbon fibers, or a metal porous body in which chromium Cr is diffused into nickel Ni or nickel N1 is placed, and then molten metal is poured into the gaps between the fibers to fill the gaps between the fibers with aluminum alloy. This is carried out in the process of casting an aluminum alloy whose main components are silicon Si, magungsium Mg, copper Cu, etc. Note that the metal porous body referred to here has a porosity of 7Q to 99,
This allows aluminum to be uniformly cast into the void. or,
It is necessary to cast the fibers and the metal porous body to a thickness that takes into account machining allowance, and it is usually manufactured so that after finishing, there is a layer of about 1 to 5I+2+ fibers or metal porous bodies cast from the surface.

In the above configuration, when the scroll compressor is operated in the same manner as before, the centrifugal force of the orbiting scroll 17 acts, but the weight of the orbiting scroll 17 is the same as when it is made of only aluminum alloy, so the bearing load is small. In addition, the tip 17d of the wrap 17b of the orbiting scroll slides on the end plate 4a of the fixed scroll 4, and the tip 17d of the wrap is cast with a fiber or porous metal material having good wear resistance, so that it cannot be fixed. No matter what material the scroll 4 is made of, the orbiting scroll 1
The wear of the wrap tip 17d of No. 7 is eliminated.

In addition, since fibers or porous bodies are cast into the side surfaces 17e and 17f of the wrap, the strength is higher than before, and the deformation of the wrap 17b due to pressure load is reduced. Wrap 4b of scroll and orbiting scroll.

Even when 17b contacts, wear resistance is improved.

Also, during manufacturing, the flow of the molten metal is better than when fibers or porous metal bodies are inserted throughout the product, and a uniform structure can be obtained.

In particular, by using the molten metal forging method to form the material of the orbiting scroll 17, the structure becomes dense, the tensile strength and fatigue strength of the aluminum alloy itself are improved, and the molten metal is uniformly distributed within the voids of the porous metal body. It is easy to get into the porosity, and when the porosity decreases, it is possible to prevent the formation of cavities and the like.

In addition, by using nickel Ni as the metal porous body, Ni −
Creates a compound layer of Afl to increase hardness (HV700~
76o) Aluminum alloy with low hardness and N t -A with high hardness on the sliding surface! 1 compound layer is dispersed to eliminate galling and improve wear resistance. In addition, nickel Ni
Generally, a temperature of 500° C. or higher is required to form a compound layer of aluminum alloy Afl and aluminum alloy Afl, and high temperature control is required. Therefore, nickel Ni
By using a porous metal body consisting of chromium and Cr, N1-yo%.

By blending Cr=30%, wear resistance can be improved without creating a compound layer with a very high hardness of HV250 to 350, and high temperature control is not required. In this case, if chromium Cr is diffused and penetrated at a weight ratio of 10φ or more, a hardness HV of about 200 or more is obtained, and there is no problem in terms of wear resistance. Further, if the weight ratio is 60% or less, it can be easily diffused and penetrated.Another embodiment of the present invention will be explained with reference to FIGS. 3 and 4.

Reference numeral 18 designates an orbiting scroll, which includes a wrap 1sb, an end plate 18a, and a protrusion 18c that have the same shape as the conventional example, but in this embodiment, fibers mainly composed of silicon carbide SiC or alumina Al2O3 are used in the aluminum alloy. Fibers or carbon fibers as a component, or a metal porous body in which chromium Cr is diffused into nickel Ni or nickel Ni is cast into the surface of the end plate 18a on the wrap 18b side. Incidentally, the manufacturing method and the like are the same as those in the previous embodiment, and the explanation thereof will be omitted below. Therefore, in this case, the wrap 4 of the fixed scroll 4
Fibers or metal porous material with good abrasion resistance are cast into the end of b and the surface of the end plate 18a that slides on the end plate 4d, eliminating wear of the end plate 18a, improving the strength of the end plate 18a, and creating a uniform structure. reliability is improved.

Still another embodiment of the present invention will be described with reference to FIGS. 5 and 6. Reference numeral 19 denotes an orbiting scroll, which has an end plate 19a, a wrap 19b, and a protrusion 19c having the same shape as the conventional example. In this example, chromium Cr is diffused and penetrated into aluminum alloy with silicon carbide (SiC) as the main component, or fiber with alumina (Al2O3) as the main component, or carbon fiber, or chive-less N1 or nickel (Ni). Contact sliding portion 19d of the porous metal body with the thrust holding mechanism 14 on the anti-wrap side
, the key grooves 19e and 1sf that come in contact with and slide on a key part (not shown) of the anti-rotation groove 6, and the protrusion 19C that comes in contact with and slide on the shaft 11 are cast. Therefore, in this case as well, the contact sliding parts and the parts requiring strength are strengthened, and a more uniform structure is obtained, so that wear resistance and reliability are improved.

Still another embodiment of the present invention will be described with reference to FIGS. 7 and 8. Reference numeral 20 denotes a fixed scroll, which has an end plate 20a and a wrap 20b having the same shape as the conventional example.In the case of this embodiment, the tip 20c of the wrap 20b, the side surface 20d of the wrap,
20 e and wrap side mirror plate 2 Oa surface mirror plate 20 The aluminum alloy on the bottom surface 20f of a is coated with fibers whose main component is silicon carbide SiC, or fibers whose main component is alumina A12O3, or carbon fibers, or nickel N1 or nickel. A porous metal body in which Ni is diffused and penetrated with chromium Cr is cast. Therefore, a fiber or metal porous body with good wear resistance is cast into the part of the orbiting scroll 5 that slides on the end plate 5a and the part that slides on the tip of the wrap 5b, which improves the wear resistance and increases the strength. Stronger and more reliable.

In the explanation of this embodiment, several examples were shown in which porous fibers and metal bodies were cast in multiple parts, but in short, it is sufficient to cast the minimum necessary amount in the necessary places, and only one cast is required.
It goes without saying that it may be placed in one place or in a plurality of places, and the shapes of the fibers and metal porous body to be cast are not limited.

In addition, even in cases where the end of the wrap and the other end plate do not directly slide, such as those in which a sealing material is installed at the tip of an orbiting scroll or a fixed scroll to improve sealing performance, the sealing material may come into contact with the end plate. It goes without saying that the same effect as that obtained by casting fibers or porous metal bodies into the mirror plate according to the present invention can be obtained.

Furthermore, it goes without saying that the same effect can be obtained even if fibers and metal porous bodies made of different materials are cast into one orbiting scroll or fixed scroll.

Effects of the Invention As is clear from the above description, the present invention comprises two mutually interlocking orbiting scrolls and fixed scrolls having wraps standing upright on end plates, an autorotation prevention mechanism that prevents the orbiting scrolls from rotating and allows them to perform orbiting motion, It is equipped with a shaft that connects the orbiting scroll and the electric motor section, and a thrust holding mechanism that retains the thrust force of the orbiting scroll. At least a part of the sliding part of the prevention mechanism, the sliding part of the orbiting scroll and the shaft, and the sliding part of the orbiting scroll and the thrust holding mechanism are made of fibers mainly composed of silicon carbide SiC or alumina Al2O3. fiber,
Or, because it is formed by containing carbon fiber or a porous metal body, it is possible to reduce the weight of the orbiting scroll, which reduces bearing load, and when manufacturing by casting, it improves the flowability of the molten metal, so it is uniform. It has effects such as obtaining a fine structure and improving the abrasion resistance of the portion containing the fiber or metal porous body.

[Brief explanation of the drawing]

FIG. 1 is a front view of an orbiting scroll of a scroll compressor showing one embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line n-n' of FIG. A front view of an orbiting scroll showing a real-life example, Fig. 4 is the same as ■-IV' in Fig. 3.
5 is a rear view of an orbiting scroll showing another embodiment of the present invention, and FIG. 6 is a cross-sectional view taken along
Fig. 7 is a front view of a fixed scroll showing another embodiment of the present invention, and Fig. 8 is a cross-sectional view taken along a line shown in Fig. 7.
FIG. 9 is a cross-sectional view of a conventional scroll compressor, and FIG. 10 is a cross-sectional view taken along line x-x' in FIG. 9. 4.2o...Fixed scroll, 5, 17, 18
゜19...Rotating scroll nope 6, River... Rotation prevention mechanism, 11... Shaft, 14... Mark, Thrust holding mechanism. Name of agent: Patent attorney Toshio Nakao (1 person)
- Rotating scroll 0-rut blood-j light slope /'M---lap light fan 11e, /1f---Razude law surface 1b /'lc ~ /a ---1 turning scroll 18o---1 Nuri Kamezaka tab-m-Utsubu No. 3 f (3cm Yahei lac/lq-Ichiriki Shiba concave Zugrol wao-Main board/'?b---Ruff. Fig. 5 1'?c-゛Protrusion zo-National scroll 2θi-Line board ZOb-゛-Ruff"ZθJ-"Mutatsu 7 bottom surface O Fig. 8 Fig. 9 /A //b Fig. 10

Claims (7)

[Claims] (1) Two mutually engaged orbiting scrolls and fixed scrolls having wraps standing upright on the end plate, an anti-rotation mechanism that prevents rotation of the orbiting scroll and allows the orbiting movement to occur, and a shaft that connects the orbiting scroll and the electric motor section. , a thrust holding mechanism for holding the thrust force of the orbiting scroll; at least the orbiting scroll is made of an aluminum alloy; a sliding portion between the orbiting scroll and the fixed scroll; and a sliding portion between the orbiting scroll and the rotation prevention mechanism; At least a portion of the sliding portion between the orbiting scroll and the shaft, and the sliding portion between the orbiting scroll and the thrust holding mechanism are made of silicon carbide (S).
iC) or alumina (Al_2O_
3) A scroll-type compressor formed of a porous body of fibers, carbon fibers, or metal whose main component is 3). (2) The scroll compressor according to claim 1, wherein the sliding portion is a tip end portion and/or a side portion of the wrap of the orbiting scroll. (3) The scroll compressor according to claim 1, wherein the sliding portion is a mirror plate surface on the wrap side of the orbiting scroll. (4) The scroll compressor according to claim 1, wherein the sliding portion is a contact portion with the anti-rotation mechanism and/or a contact portion with the thrust holding mechanism on the mirror plate surface on the opposite side of the orbiting scroll. . (5) The scroll compressor according to claim 1, wherein the sliding portion is a contact portion with a shaft formed on the opposite side of the orbiting scroll. (6) The scroll compressor according to claim 1, wherein the sliding portion is a tip end portion and/or a side portion of the wrap of the fixed scroll. (7) The scroll type compressor according to claim 1, wherein the sliding portion is an end plate of the fixed scroll and a surface facing the end plate of the orbiting scroll and/or a surface facing the wrap.