JPH0392591A - Scroll type compressor - Google Patents

Abstract

PURPOSE:To prevent the progress of the seizure and abrasion of sliding faces together and prevent the abrasion of seal members by applying iron plating on one sliding face of fixed and moving scrolls made of aluminum, and fitting seal members at tip sections of vortex sections of both scrolls. CONSTITUTION:A pure iron plated film C with the same hardness as that of a hard alumite film is formed on the surface of the vortex section 8b of a moving scroll 8, while the surface of the vortex section 1b of a fixed scroll 1 is left as an aluminum base material. The sliding face of the vortex section 1b can be deformed and slid on the sliding face of the vortex section 8b so as to absorb the contact pressure, the frequency that the oil film cut occurs is decreased, and the progress of the seizure due to the adhesion of sliding faces together and the abrasion of sliding faces is prevented. Seal members 9 and 10 fitted to vortex sections 1b and 8b of both scrolls 1 and 8 are brought into contact with mating substrates 8a and 1a respectively, but pure iron plating has a smooth surface, and the progress of the abrasion of seal members 9 is slowed.

Description

[Detailed Description of the Invention] Industrial Application] The present invention provides a fixed scroll housed in a housing;
This invention relates to a scroll type compressor that forms a closed space whose volume decreases based on the revolution of the movable scroll between the fixed scroll and a movable scroll that is housed and supported so as to be non-rotatable but rotatable. [Prior art] This type of scroll compressor has the property that the contact state of the side walls of both spiral parts when the movable scroll revolves is close to line contact, and the contact pressure is higher than in other types of compressors. are doing. Also, in order to make the compressor lighter and smaller, both scrolls are made of aluminum alloy, but the sliding surfaces of both scrolls are made of an aluminum alloy base. If the contact pressure increases to the extent that an oil film breaks during operation of a pressurized pressurizer, both members will deform and stick together at the contact area, causing the problem that both sliding parts will seize. ．． In addition, when the sliding surfaces of both scrolls are treated to be hard, on the contrary, since both scrolls are hard, it becomes difficult for both members to deform at the contact portion, and furthermore, the contact pressure increases, causing scratches on each other. As a result, the hard coating pieces created by these scratches were interposed between the sliding surfaces, accelerating wear. In order to solve the above problems, Japanese Patent Publication No. 63-32992 discloses a scroll in which the sliding surface of either the fixed scroll or the movable scroll is subjected to hard alumite treatment, and the sliding surface of the other scroll is made of aluminum. A type compressor is disclosed. [Problems to be Solved by the Invention] In the scroll type compressor disclosed in the above-mentioned Japanese Patent Publication No. 63-32992, seizure due to adhesion between the sliding surfaces of both scrolls and progress of wear on the sliding surfaces are prevented. be able to. However, when hard alumite treatment is applied to the sliding surface of the scroll, the surface roughness of the surface is 15 to 20R.
z and the surface roughness of the aluminum substrate, which is 5 to 7 Rz, is 2 to 3 times rougher. On the other hand, in a scroll compressor, a sealing member (chip seal) is installed at the tip of the scroll along the scroll in order to improve the sealing between the tip of the scroll and the base end of the scroll. It is being said. The preferred material for the seal member is a soft material with a low coefficient of surface friction, such as fluororesin. However, when hard alumite treatment is applied to the sliding part of the scroll, the surface roughness becomes 2 to 3 times rougher than that of the aluminum base material, so it is difficult to attach it to the tip of the spiral part of the scroll on the opposite side. This will cause severe wear on the sealing members and premature deterioration of sealing performance is unavoidable. The present invention has been made in view of the above problems, and includes:
The purpose of this is to prevent seizure due to adhesion between the sliding surfaces of the scroll and the progression of wear on the sliding surfaces, and to improve the sealing performance between the tip surface of the scroll spiral portion and the base end wall of the scroll. Therefore, it is an object of the present invention to provide a scroll type compressor that can prevent wear of a seal member installed along the spiral portion at the tip of the spiral portion. [Means for Solving the Problems] In order to achieve the above object, the present invention includes a fixed scroll housed in a housing, and a movable scroll housed and supported opposite to the fixed scroll so as to be non-rotatable but rotatable. In a scroll type compressor that forms a closed space between which the volume Wi decreases based on the revolution of the movable scroll, both the fixed scroll and the movable scroll are made of aluminum alloy, and both the fixed scroll and the movable scroll are in sliding contact with each other. The sliding surface of one of the scrolls was plated with iron, and a sealing member was attached along the spiral portion to the tips of the spiral portions of both scrolls to make sliding contact with the substrate of the other scroll. [Function] In the scroll-type pressure B machine of the present invention, iron plating is applied to the sliding surface of either the fixed scroll or the movable scroll, so the roughness of the sliding surface is the same as that without the treatment. This increases the hardness and prevents the progression of wear on the sliding surfaces, and since the sliding surfaces are made of different materials, seizures due to adhesion between the sliding surfaces are prevented. Furthermore, since the surface roughness remains smooth even with iron plating, early wear of the sealing member attached to the tip of the scroll along the spiral is also prevented. [Examples] Examples that embody the present invention will be described below with reference to the drawings. As shown in Fig. 1, there is a fixed scroll 1 made of aluminum alloy that also serves as a rear housing, and a front housing 2.
A and 2B are joined and fixed, and an annular fixed substrate 3 is fitted and fixed on the inner surface of the tip of the outer peripheral wall of the fixed scroll 1 so as to be in contact with the tip surface of the front housing 2B. A rotary shaft 4 is rotatably accommodated in the front housings 2A, 2B, and at an eccentric position at the end of the large diameter portion 4a of the rotary shaft 4, a faith shaft 5 passes through a passage in the center of the fixed base plate 3 and is attached to a fixed scroll. It protrudes within the surrounding area of the outer peripheral wall of l. A balance weight 6 and a pusher 7 are rotatably supported on the eccentric shaft 5, and a movable scroll 8 made of aluminum alloy is rotatably supported on the pusher 7 while facing the fixed scroll 1.

The substrates 1a and 8a of both scrolls 1 and 8 and the spiral portion tb.
A compression chamber is formed by sb. Movable scroll 8
The sliding surface, that is, the surface of the spiral portion 8b, is plated with pure iron, and the pure iron plated aC is harder than the aluminum base.
is formed. That is, by creating a hardness difference between the spiral portions 1b and 8b of both scrolls 1.8 that are in sliding contact with each other, the slidability of both scrolls 1.8 is improved. An eraser is formed on the tip surface of the spiral portion 1b of the fixed scroll 1, extending from the starting end of the spiral portion 1b to near the terminal end.
A seal member 9 having the same length as the groove IC is fitted into the groove IC so as to be in contact with the base plate 8a of the movable scroll 8. Similarly, a seal member 9 having the same length as the groove IC is fitted into the groove IC so as to be in contact with the base plate 8a of the movable scroll 8.
is formed extending from the starting end to near the terminal end of the spiral portion 8b, and a sealing member 10 having the same length as the spiral portion 8C is fitted in contact with the base plate 1a of the fixed scroll 1. Both seal members 9 and 10 are made of a material such as fluororesin. A fixing ring 11 is fixed on the fixed base plate 3 facing the movable scroll 8, and the fixing ring 11 has a plurality of circular revolution position regulating holes 11a formed therethrough at equally spaced positions. A movable ring l2 is fixedly attached to the front surface of the base plate 8a of the movable scroll 8. The movable ring l2 has the same number of circular revolution position regulating holes 12a formed opposite to the revolution position regulating holes 11a. Each revolution position regulation hole 11a. 12a accommodates disc-shaped shoes 13a and 13b with a smaller diameter, and the opposing shoes 1
3a. A ball 14 is interposed between 13b and 13b. Both shoes 13a. 13b and the ball 14 are press-fitted between the fixed base plate 3 and the movable scroll 8 by a compression reaction,
Unified in appearance. As shown by the chain line in FIG. 2, all the shoes 13a, 13b rotate in the same direction as the width center axis 5 revolves around the revolution position regulating hole 11a. The movable scroll 8 revolves around the periphery of the revolution position regulating holes 11a and 12a while being sandwiched between them, so that the movable scroll 8 revolves without rotating on its axis. An inlet 1d for introducing refrigerant gas is provided on the outer peripheral wall of the fixed scroll 1 in the vicinity of the fixed substrate 3 that regulates the revolution position of the movable scroll 8 which revolves while being prevented from rotating. It is introduced into the compression chamber between scrolls 1 and 8. The refrigerant gas compressed between both scrolls 1.8 is then passed through the discharge port 1e, which is releasably closed by the discharge valve 15, to the substrate 1 of the fixed scroll 1.
It is discharged into the discharge chamber 16 on the back side of a. As the movable scroll 8 revolves, the spiral portions 1b of both scrolls 1 and 8,
The side walls of the scrolls 8b are in sliding contact with each other, but while the surface of the spiral portion 1b of the fixed scroll 1 remains aluminum, the surface of the spiral portion 8b of the movable scroll 8 is coated with hard alumite WA (hardness Hv 300-400). Since the pure iron plating 1c (hardness} {v300 to 400) is formed, the sliding surface of the spiral portion 1b of the fixed scroll 1 runs over the sliding surface of the spiral portion 8b of the movable scroll 8. It becomes possible to deform and move in a manner that absorbs contact pressure, reducing the frequency of oil film failure, preventing seizure due to adhesion between sliding surfaces, and progression of wear on sliding surfaces. ．． Further, the seal members 9.10 attached to the spiral portions 1b and 8b of both scrolls 1 and 8 are in sliding contact with the substrates 8a and la of the opposing scrolls 8.1, respectively. scroll 1.8
The aluminum base made of material has a smooth surface roughness of 5 to 7 Rz, but when hard alumite treatment is applied as in the past, the surface roughness is 15 to 20 Rz, which is 2 times higher than that of the untreated one.
The roughness becomes ~3 times as large, and the sealing member 9 that comes into sliding contact with the hard alumite treated portion progresses to early wear. However, in the case of pure iron plating, the surface roughness is 5 to 7.
Since the seal member 9 is as smooth as the Rz and untreated one, the progress of wear of the seal member 9 is slow. The compressor was operated continuously under the following conditions, and the amount of wear (amount of decrease in thickness in the protruding direction) of the seal member 9 was measured. Compressor rotation speed...1200ru Suction pressure...3 ksr/cj Discharge pressure
...27 kg/ad Continuous operation time...400 hours As a result, when hard alumite treatment was applied as in the past, the wear amount was 200 μm, compared to
When the pure iron plating treatment of the present invention is applied, the amount of wear is 12
It was almost halved to 0μm. Note that the present invention is not limited to the above-mentioned embodiments, and for example, pure iron plating may be applied to the fixed scroll IIIl instead of the movable scroll 8 side. However, when the fixed scroll 1 is formed integrally with the housing as in the above embodiment, if the fixed scroll 1 is plated with pure iron, unnecessary parts (the housing part) will be prevented from being plated. For example, if masking is not performed, plating raw materials will be wasted, so pure iron plating is performed using a movable screen.
-It is better to apply it to Le 8 opening. [Effects of the Invention] As detailed above, according to the present invention, even if the fixed scroll and the movable scroll are made of aluminum alloy in order to reduce the weight and size of the compressor, the sliding of either scroll Since the surfaces are plated with pure iron, it prevents the sliding surfaces of both scrolls from sticking together and causing seizure and wear on the sliding surfaces. Unlike the case without hard alumite treatment, the surface roughness remains the same even with pure iron plating, which prevents wear of the sealing member attached to the tip of the spiral part of the scroll, resulting in a good seal. It has the excellent effect of maintaining performance over a long period of time.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention;
Figure 2 is a sectional view taken along line A-AM in Figure 1. Fixed scroll 1, substrate 1a, spiral portion 1b, fixed substrate 3, movable scroll 8, substrate 8a-vortex portion 8b, seal members 9, 10,
Pure iron plated WAc.

Claims (1)

[Claims] 1. A sealed space whose volume decreases based on the revolution of the movable scroll is formed between the fixed scroll housed in the housing and the movable scroll housed and supported opposite the fixed scroll so as to be non-rotatable but rotatable. In a scroll type compressor, both the fixed scroll and the movable scroll are made of aluminum alloy, and the sliding surface of either the fixed scroll or the movable scroll that is in sliding contact with each other is plated with iron, and the tips of the spiral portions of both scrolls are plated with iron. A scroll-type compressor in which a sealing member is installed along the spiral portion in sliding contact with the substrate of the other scroll.