JP3459578B2 - Masking method of bearing part of orbiting scroll - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a masking method for a bearing portion of an orbiting scroll, and more particularly, to an oscillation of a scroll compressor used in a vacuum pump, an air pump, a refrigerator, an air conditioner and the like. The present invention relates to a method of masking a bearing portion of an orbiting scroll when a scroll is hard alumite surface treated.

[0002]

2. Description of the Related Art Conventionally, a scroll compressor 1A used in a refrigerating cycle such as an air conditioner has a structure shown in FIG. 4, for example. An electric element 2 and a scroll compression element 3 are incorporated inside a cylindrical closed container 1 whose both ends are closed. The electric element 2 is composed of a stator 4 fixed to the inner wall surface side of the closed casing 1 and a rotor 5 rotatably supported inside the stator 4, and a rotary shaft 6 is connected to the rotor 5 in a penetrating state. Has been done. This rotating shaft 6
The crank portion 7 is rotatably supported by a support frame 8 forming a part of the scroll compression element 3. The other end of the rotary shaft 6 is projected from the rotor 5, and its tip is extended downward so as to be submerged in the lubricating oil b contained in the closed container 1. Further, an oil passage 9 that sucks and supplies the lubricating oil b is axially provided in the rotary shaft 6,
Lubricating oil is supplied to each sliding portion such as the support frame 8 through the oil passage 9 and then recirculated.

The one end of the rotary shaft 6 supported so as to penetrate the support frame 8 is formed as an eccentric part 10 whose center is eccentric with the axis of the rotary shaft 6,
A swing scroll 11 is connected to the eccentric portion 10. The orbiting scroll 11 has a bearing portion (boss hole portion) 13 to which the eccentric portion 10 is connected at the center of one side surface of the end plate 12 formed in a disk shape. In the bearing portion 13,
A wound dry bush 22 (for example, made of a material obtained by impregnating lead bronze with Teflon or the like) is provided in close contact with the inner wall surface of the bearing portion 13. A spiral wrap 14 is integrally formed on the other side surface of the end plate 12 of the orbiting scroll 11. A fixed scroll 15 is fixedly connected to the support frame 8.
The fixed scroll 15 has a spiral wrap 16 formed in a portion facing the orbiting scroll 11.
A plurality of compression chambers 17 are formed between the wrap 14 and the wrap 14.
These compression chambers 17 suck the refrigerant gas in the outer peripheral portion through the suction pipe 18 and gradually move to the center to reduce the volume and compress the refrigerant gas. The discharge port 19 provided in the central portion of the side surface discharges the high-pressure space in the closed container 1 and the lubricating oil entrained in this space is separated, pulsation is reduced, and the discharge pipe 20
Is discharged from. An Oldham ring 21 is interposed between the fixed scroll 15 and the orbiting scroll 11 that constitute the scroll compression element 3.
Drive the electric element 2 to revolve the orbiting scroll 11 with respect to the fixed scroll 15 on a circular orbit so as not to rotate.

The fixed scroll 15 is usually made of cast iron, and the orbiting scroll 11 is made of aluminum or aluminum alloy from the viewpoint of weight reduction and workability.
The surface of the orbiting scroll 11 is subjected to hard alumite treatment or special hard alumite treatment (impregnation of alumite film with MoS ₂ ) (hereinafter referred to as hard alumite treatment) to improve wear resistance. The bearing portion 13 of the orbiting scroll 11 is required to have an accuracy of several microns in dimension. However, when the orbiting scroll 11 is subjected to the hard alumite treatment, the anodizing electrolyte enters the bearing portion 13 and a part or all of the inner surface of the bearing portion 13 is subjected to the hard alumite treatment. There is a problem in that the accuracy is lowered and the wound dry bush 22 is corroded by the electrolytic solution that has entered the bearing portion 13.

Therefore, conventionally, as shown in FIG. 3, a T-shaped masking resin member 30A made of silicon rubber or the like has been previously inserted into the bearing portion 13 when the hard alumite treatment is performed. . However, in this method, the T-shaped masking resin member 3 inserted during the hard alumite treatment is used.
0A is likely to fall off or be misaligned, masking becomes uncertain, and the anodizing electrolytic solution enters the end surface of the bearing portion 13 to corrode the end surface, or a part of the rolled dry bush 22 is corroded by the electrolytic solution. There is a problem that defective products occur.

[0006]

DISCLOSURE OF THE INVENTION An object of the present invention is to provide a bearing portion 1 when a rocking scroll 11 is hard-anodized.
3 is a masking method using a masking member, wherein the masking member does not fall off during the hard alumite treatment, and reliable masking can be performed even if it is slightly displaced, and it can be used repeatedly. It is to provide a method of masking the bearing portion 13 of the orbiting scroll 11 by using.

[0007]

That is, in order to solve the above problems, the invention of claim 1 has a fixed scroll and a bearing portion into which one end of a rotating shaft of an electric element is inserted, and is driven by the rotating shaft. When a hard alumite surface treatment is performed on the oscillating scroll of a scroll compressor having an oscillating scroll made of aluminum or aluminum alloy that revolves with respect to the fixed scroll, a cap made of a resin and / or a rubber is previously attached to the bearing portion. A masking method for a bearing portion of an orbiting scroll, which is characterized in that an electrolytic solution is prevented from invading into the bearing portion during a hard alumite surface treatment by closely covering with a striped masking member.

According to a second aspect of the present invention, in the masking method according to the first aspect, the cap-shaped masking member is a top plate, and a peripheral portion of the top plate has a maximum length downward in the vertical direction of the bearing portion. Integrally with a peripheral portion extending to,
The inner wall of the peripheral portion is closely adhered to the outer periphery of the bearing portion for masking.

According to a third aspect of the present invention, in the masking method according to the first or second aspect, a convex portion is integrally provided at the central portion of the lower surface of the top plate, and the outer wall of the convex portion is the bearing. The feature is that the inner periphery of the part is closely masked.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings shown in FIGS. Figure 1
It is explanatory drawing explaining one embodiment of the masking method of the bearing part of the orbiting scroll of this invention. In FIG. 1, FIG.
The same reference numerals as those in FIG. 4 indicate the same elements. As shown in FIG. 1, when the aluminum or aluminum alloy oscillating scroll 11 is subjected to the hard alumite surface treatment, a resin and / or rubber cap-shaped masking member 30 is adhered to the bearing portion 13 of the oscillating scroll 11 in advance. Cover and mask.

The resin used for forming the masking member 30 is not particularly limited as long as it is a resin that is not affected by the electrolytic solution used for the hard alumite surface treatment and can be masked by closely covering the masking member 30 with the bearing portion 13. Not done. Specific examples of such a resin include a fluorine resin, a silicone resin, a polyolefin resin, and various engineering plastics. The rubber used for forming the masking member 30 may be natural rubber, synthetic rubber, or a mixture thereof, and the masking member 30 is adhered to the bearing portion 13 without being attacked by the electrolytic solution used for the hard alumite surface treatment. The rubber is not particularly limited as long as it can be covered and masked. Specific examples of such rubber include, for example, fluorine-based rubber, silicone-based rubber, polyolefin-based rubber,
Examples include various thermoplastic elastomers.
It is also possible to use a mixture of the resin and rubber.

The masking member 30 has a top plate 31 and a length L in the vertical direction of the bearing portion 13 at the periphery of the top plate 31 at the maximum.
Is integrally provided with a peripheral edge portion 32 extending downward, and the inner wall of the peripheral edge portion 32 is in close contact with the outer periphery of the bearing portion 13 for masking. When the length of the peripheral portion 32 in the vertical direction is A and the thickness of the top plate 31 is D, (A-D) and L
Has a relationship represented by the following formula (1). (A−D) ≦ L Formula (1) When the rocking scroll 11 is subjected to the hard alumite surface treatment, the bearing portion 13 is previously provided before the hard alumite surface treatment is performed.
Then, the masking member 30 having the above-mentioned configuration is closely attached and covered.
When the masking member 30 is used, the inner wall of the peripheral portion 32 is in close contact with the outer periphery of the bearing portion 13 for masking, so that the masking member 30 does not fall off during the hard alumite treatment, and even if the masking member 30 is slightly misaligned. Is ensured, and the electrolytic solution does not enter the bearing portion 13. The masking member 30 can be repeatedly used after use.

FIG. 2 is an explanatory view for explaining another embodiment of the masking method for the bearing portion of the orbiting scroll of the present invention. In FIG. 2, the same symbols as those in FIGS. 1, 3 and 4 indicate the same components. The resin and / or rubber cap-shaped masking member 30B includes a top plate 31 and the top plate 3
A peripheral portion 32 extending downward by a maximum length L in the vertical direction of the bearing portion 13 and a convex portion 33 in the central portion of the lower surface of the top plate 31 are integrally provided on the peripheral edge of the peripheral portion 1. The inner wall of the convex portion 33 is in close contact with the outer periphery of the bearing portion 13 for masking, and the outer wall of the convex portion 33 is in close contact with the inner periphery of the wound dry bush 22 of the bearing portion 13 for masking. When the rocking scroll 11 is hard alumite surface treated,
Before the hard alumite surface treatment is performed, the masking member 30 </ b> B having the above-described configuration is closely attached to the bearing portion 13 in advance. In this masking member 30B, the inner wall of the peripheral edge portion 32 is in close contact with the outer periphery of the bearing portion 13 for masking, and the convex portion 3
Since the outer wall of 3 closely adheres to the inner circumference of the rolled dry bush 22 of the bearing portion 13 for masking, the masking member 30B does not fall off during the hard alumite treatment, and the masking is more reliable even if it is slightly displaced. Electrolyte is bearing 13
Never enter inside. The masking member 30B can also be used repeatedly after use.

By using the method of the present invention as described above, when the rocking scroll 11 is subjected to the hard alumite treatment,
Since the anodizing electrolyte enters the bearing portion 13 and the end surface and the inside of the orbiting scroll 11 and the end surface and the inner surface of the bearing portion 13 are not corroded or hard anodized, high dimensional accuracy can be maintained and the rolled dry bush 22 Will not be corroded by the electrolytic solution that has entered the bearing portion 13. The masking members 30 and 30B can be easily put on or removed from the bearing portion 13, and can be repeatedly used because they are not attacked by the electrolytic solution used for the hard alumite surface treatment.

Since the present invention is not limited to the above embodiments, various modifications can be made without departing from the spirit of the claims.

[0016]

By using the method of the present invention, when the orbiting scroll is subjected to hard alumite treatment, the masking member previously covered on the bearing portion of the orbiting scroll does not fall off during the hard alumite treatment and is slightly displaced. However, since the bearing is sufficiently masked, the electrolytic solution is prevented from entering the bearing, and the end and inner surfaces of the bearing are not corroded or hard anodized, so high dimensional accuracy of the bearing is maintained. In addition, the wound dry dish will not be corroded by the electrolytic solution. The masking member can be easily put on and taken off from the bearing portion, and can be used repeatedly because it is not attacked by the electrolytic solution used for the hard alumite surface treatment.

By using a masking member integrally provided with a top plate and a peripheral edge portion extending downwardly in the vertical direction of the bearing portion at the maximum in the peripheral edge of the top plate, the inner wall of the peripheral edge portion has a bearing portion. If the masking is performed in close contact with the outer periphery of the masking, the masking will be reliable.

A convex portion is integrally provided at the center of the lower surface of the top plate so that the inner wall of the peripheral edge portion is in close contact with the outer periphery of the bearing portion for masking, and the outer wall of this convex portion is in close contact with the inner periphery of the bearing portion. If the masking is performed by using the masking, the masking becomes more reliable.

[Brief description of drawings]

FIG. 1 is an explanatory diagram illustrating an embodiment of a masking method for a bearing portion of an orbiting scroll according to the present invention.

FIG. 2 is an explanatory view illustrating another embodiment of the masking method for the bearing portion of the orbiting scroll of the present invention.

FIG. 3 is an explanatory diagram illustrating a masking method for a bearing portion of a conventional oscillating scroll.

FIG. 4 is a cross-sectional explanatory view of a scroll compressor.

[Explanation of symbols] 1A scroll compressor 2 electric elements 6 rotation axes 10 Eccentric part 11 swing scroll 13 Bearing 15 Fixed scroll 30, 30B Cap-shaped masking member 31 Top plate 32 Perimeter 33 convex

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Sato 2-5-5 Keihan Hondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Kazuaki Fujiwara 2-chome, Keihan-hondori, Moriguchi-shi, Osaka No. 5 in Sanyo Electric Co., Ltd. (56) Reference JP-A-7-126891 (JP, A) JP-A-8-261169 (JP, A) JP-A-9-119382 (JP, A) JP-A-5 -340364 (JP, A) JP 63-32992 (JP, A) JP 3-122654 (JP, A) JP 7-238396 (JP, A) JP 8-28346 (JP, A) ) Actual Kaihei 5-62569 (JP, U) Actual Kaihei 2-78566 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F04C 18/02 311 F04C 29/00

Claims (2)

(57) [Claims] 1. An orbiting scroll made of aluminum or aluminum alloy, which has a fixed scroll and a bearing portion into which one end of a rotary shaft of an electric element is inserted, and which is driven by the rotary shaft and revolves with respect to the fixed scroll. When the rocking scroll of the scroll compressor provided is subjected to a hard alumite surface treatment, a resin and / or rubber cap-shaped masking member is closely adhered to the bearing portion in advance, and the electrolytic solution is aforesaid during the hard alumite surface treatment. Maskin of the bearing part of the orbiting scroll to prevent it from entering the bearing part
In the above method, the cap-shaped masking member is a top plate and a periphery of the top plate.
At the edge, it extends at most down the longitudinal length of the bearing.
A peripheral part is integrally provided, and the inner wall of the peripheral part is the bearing.
A method for masking a bearing portion of an orbiting scroll, which is characterized in that the outer periphery of the portion is closely masked. Wherein integrally provided a convex portion on the lower surface center portion of the top plate, according to claim 1 in which the outer wall of the convex portion, characterized in that so as to mask in close contact with the inner periphery of the bearing portion A method for masking a bearing portion of an orbiting scroll as described above .