JPH08189482A - Scroll compressor - Google Patents

Abstract

PURPOSE: To elongate life of a tip seal by easily transmitting heat generated through sliding between the tip seal and a bottom of tooth, and preventing abnormal abrasion of the tip seal. CONSTITUTION: A scroll compressor is composed of a fixed scroll 1 and an oscillation scroll 2, each scroll having a tip seal on its tooth end. A coating layer 6 made of material softer than that of the tip seal 5 and having conformability is formed on a bottom of each tooth of the fixed scroll 1 and the oscillation scroll 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor having a long tip seal life.

[0002]

2. Description of the Related Art A scroll compressor is a compressor that presses a rocking scroll against a fixed scroll and rocks (revolves without rotating) to compress a fluid sucked from a suction port and discharge it from a discharge port. Therefore, the airtightness of the closed space formed by the fixed scroll and the orbiting scroll is important. That is, it is important to reduce the fluid leakage by reducing the gap between the fixed scroll and the orbiting scroll.

As a scroll compressor in consideration of the airtightness of the closed space, a hardened layer is formed on the surfaces of both scrolls, and a layer of a substance having conformability is formed on the surface of at least one of the scrolls. A scroll compressor is proposed in Japanese Patent Publication No. 63-32991. This scroll compressor has a problem that it is difficult to transmit heat generated by sliding of both scrolls to both scrolls because both scrolls or one of the scrolls has a layer of a substance having conformability on all surfaces thereof.

Further, as an improvement of the scroll compressor described above, tip seals are provided at the tips of both scroll teeth, a coating layer having conformability is not formed on the bottom surface of the teeth with which the tip seals are in contact, and By forming a coating layer with conformability on the side surfaces of both scrolls to reduce the gap between the scrolls, damage is reduced even if they come into contact with each other, and heat generated by sliding between the tip seal and the bottom surface of the teeth is applied to both scrolls. A scroll compressor that facilitates transmission is proposed in Japanese Utility Model Laid-Open No. 2-145687.

[0005]

[Problems to be solved by the invention]
In the scroll compressor proposed in the publication, it is necessary to mask the coating layer on the bottom surface of the tooth with which the tip seal comes into contact during coating in order to prevent the coating layer from being formed. Masking at the time of coating makes masking work difficult with a scroll compressor having a complicated shape. Moreover, since the coating is usually sprayed by hand, the thickness of the coating layer increases at the boundary between the masking portion and the coating portion, and it is difficult to form a uniform coating layer on the coating portion.

Further, in this scroll compressor, since the tip seal does not have a coating layer formed on the bottom surface of the tooth, the tip seal directly contacts the bottom surface of the tooth, which causes abnormal wear of the tip seal and shortens the life of the tip seal. There is a problem.

According to the present invention, a material having a softening property that is softer than that of the tip seal material is used. By uniformly coating the side surfaces and the bottom surfaces of the teeth of both scrolls, the scroll side surfaces reduce the gap between the scrolls, and the contact is made. However, the damage is reduced, and regarding the bottom of the tip seal,
An object of the present invention is to provide a scroll compressor in which heat generated by sliding between the tip seal and the bottom surface of the teeth is easily transmitted to both scrolls, abnormal wear of the tip seal is prevented, and the life of the tip seal is extended.

[0008]

SUMMARY OF THE INVENTION The gist of the present invention is to provide at least bottom surfaces of teeth of a fixed scroll and an orbiting scroll of a scroll compressor having a fixed scroll and an orbiting scroll in which tip seals are provided at tips of scroll teeth. A scroll compressor in which a coating layer is formed of a material that is softer than the tip seal material and that is compatible with the tip seal material.

[0009]

In the scroll compressor of the present invention, the side surfaces and the bottom surface of the teeth of the fixed scroll and the orbiting scroll are all coated, so that there is no masking portion during coating, and a uniform coating layer is formed on the coating portion. Is possible.

For the coating layer, a material that is softer than the chip sealing material and that is compatible is used. In the present invention, the tip seal material is a fluororesin impregnated with carbon, copper or the like in order to prolong the life of the tip seal, while the material of the coating layer is impregnated with carbon or the like. Use less soft fluororesin. Since the coating layers of the fixed scroll and the orbiting scroll are both made of fluororesin, there is no problem in their compatibility.

Although the coating layer is formed on the bottom surface of the tooth with which the tip seal contacts in the initial stage of operation of the scroll compressor, the coating layer is softer than the tip seal material. Is partially peeled off, the anxiety of the heat insulation effect of the coating layer is eliminated, and the heat generated by the sliding of the tip seal and the bottom surface of the tooth is transmitted to both scrolls. Further, since the coating layer is soft, abnormal wear of the tip seal at this time can be prevented.

Further, the bottom surface of the tooth has irregularities due to processing and surface treatment, which causes abnormal wear of the tip seal. However, since the coating layer fills the irregularities,
Although the coating layer is partly peeled off by the operation, the coating layer with irregularities remains, so that the irregularity of the bottom surface of the tooth is eliminated and abnormal wear of the tip seal is prevented, and the life of the tip seal can be extended. Regarding the side surface, the gap between the scrolls is small, and even if they come into contact with each other, there is little damage. Therefore, the performance can be improved.

[0013]

EXAMPLES Examples will be described below with reference to the drawings. FIG. 1 is a sectional view of a scroll compressor according to the present invention.
In the figure, 1 is a fixed scroll, and the fixed scroll 1 has teeth 1.
a, a suction port 3 for sucking the fluid, and a discharge port 4 for discharging the compressed fluid. Reference numeral 2 is an orbiting scroll, and the orbiting scroll 2 is provided with teeth 2a. The orbiting scroll 2 is covered with a casing 7 while being pressed against the fixed scroll 1. In the figure, 8 is an auxiliary crank, 9 and 10 are bearings, 11 and 12 are main cranks, 13
Is a balance weight, 14 is a bearing, 15 and 16 are oil seals, 17 is a bearing, and 18 is a dust seal.

FIG. 2 is a partially enlarged sectional view of the scroll compressor of FIG. 1, in which tip seals 5 are provided at the tips of the teeth 1a and 2a. In addition, the fixed scroll 1 and the orbiting scroll 2
The coating layer 6 is formed on all the surfaces that come into contact with. In the figure, 1b and 2b indicate the bottom surfaces of the teeth.

The coating layer 6 is formed by spraying a fluorine resin impregnated with carbon, which is softer than the chip sealing material and has a conformability, onto the scroll surface. In the present invention, since all the surfaces where the fixed scroll 1 and the orbiting scroll 2 contact each other are coated, there is no masking portion at the time of coating, and a uniform coating layer can be formed on the coating portion. Fixed scroll 1 and orbiting scroll 2
Since both coating layers 6 are made of fluororesin, there is no problem in the compatibility of both during operation.

During operation, by rotating the main crankshafts 11 and 12, the orbiting scroll 2 orbits (revolves) while being pressed against the fixed scroll 1 and compresses the fluid sucked from the suction port 3. And discharge from the discharge port 4. FIG. 3 shows the relationship between the tip seal 5 and the coating layer 6 on the bottom surfaces 1b and 2b of the teeth which the tip seal 5 contacts during operation.

As shown in FIG. 3 (a), at the beginning of the operation of the scroll compressor, the bottom surface 1b of the tooth with which the tip seal 5 comes into contact,
Although the coating layer 6 is formed on 2b, as shown in FIG.
As shown in (b), since the material of the coating layer 6 is softer than the tip seal material, the coating layer 6 is partially peeled off during continuous operation, and the tip seal 5 directly contacts the bottom surfaces 1b and 2b of the teeth. As a result, the anxiety of the heat insulation effect due to the coating layer disappears, and the heat generated by the sliding of the tip seal 5 and the bottom surfaces 1b, 2b of the teeth is transmitted to both scrolls. Therefore, there was no trouble due to heat generation during operation. Further, since the coating layer 6 is soft, abnormal wear of the tip seal 5 at this time can be prevented.

Further, as shown in FIG. 3, the bottom surface of the tooth has irregularities due to processing and surface treatment, which causes abnormal wear of the tip seal. However, since the coating layer 6 fills the irregularities, the coating layer 6 may be operated during operation.
Although it partially peels off, it does not completely peel off, and the coating layer 6 in the unevenness remains, so that the bottom surface of the tooth becomes smooth without any unevenness. Therefore, the tip seal 5
Abnormal wear was prevented and the life of the tip seal 5 could be extended.

[0019]

As is apparent from the above description,
According to the present invention, coating work on the scroll surface is facilitated, heat generated due to sliding between the tip seal and the bottom surface of the teeth is easily transmitted to both scrolls, and abnormal wear of the tip seal is prevented. It is possible to provide a scroll compressor having a long life.

[Brief description of drawings]

FIG. 1 is a sectional view of a scroll compressor according to the present invention.

FIG. 2 is a partially enlarged sectional view of the scroll compressor shown in FIG.

FIG. 3 is a diagram showing a relationship between a tip seal and a coating layer with which the tip seal comes into contact when the scroll compressor is in operation, wherein (a) is an initial operation and (b) is an operation.

[Explanation of symbols]

1 ... Fixed scroll, 1a ... Teeth, 1b ... Bottom of teeth, 2 ...
Oscillating scroll 2a ... Tooth, 2b ... Tooth bottom surface, 3 ... Suction port, 4 ... Discharge port, 5 ... Chip seal, 6 ... Coating layer, 7 ... Casing, 8 ... Auxiliary crank, 9 ...
Bearing, 10 ... Bearing, 11 ... Main crank, 12 ... Main crank, 13
… Balance weight, 14… Bearing, 15… Oil seal, 16
… Oil seal, 17… Bearing, 18… Dust seal.

Claims (1)

[Claims] 1. A scroll compressor comprising a fixed scroll and an orbiting scroll with tip seals provided at the tip of the scroll teeth, wherein at least the bottom surface of the teeth of the fixed scroll and the orbiting scroll is softer than a tip seal material. A scroll compressor characterized in that a coating layer is formed of a material that is compatible with the material.