JPH0610857A - Scroll compressor - Google Patents

Abstract

PURPOSE:To improve seal performance in a step differenced part region by providing a swollen part having an arc-shaped action surface of diameter larger than thickness of a volute unit in the vicinity of a step differenced part of the one volute unit and, on the other hand, an arc-shaped recessed surface larger than the arc-shaped action surface while into contact each other with the action surface of the swollen part in the vicinity of a step differenced part of the other volute unit. CONSTITUTION:A swollen part 28 of diameter larger than thickness of a volute unit 27 is formed in the vicinity of a step differenced part of the volute unit 27, and an action surface 30 of this swollen part 28 is brought into contact with a recessed surface 34 provided in the vicinity of a step differenced part of a volute unit 35 in a side of a turning scroll 21 to be larger than the action surface 30. On the other hand, the turning scroll 21 is formed into a two-stepped shape in which the volute unit 35 rises up in a volute shape toward the center from outside a base plate to also lower by stages toward an internal end 35b in the center from an external end 35a in the outside. A swollen part 38 of diameter larger than thickness of the volute unit 35 is formed in the volute unit 35, and an action surface 40 of this swollen part 38 comes into contact with a recessed surface 42 provided in the vicinity of a step differenced part of the volute unit 27 in a side of a fixed scroll 19 and to be larger than the action surface 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor suitable for an air conditioner, a refrigerator and a refrigerator.

[0002]

2. Description of the Related Art Generally, in a scroll compressor used for an air conditioner, a refrigerator, a refrigerator, etc., an orbiting scroll having a spiral body provided on a general surface of a base plate and a fixed scroll are engaged with each other to make an orbiting motion of the orbiting scroll. Correspondingly, a movable compression chamber is formed in which the volume gradually decreases toward the center, and the compressed refrigerant or the like is taken out from the discharge pipe.

[0003]

As described above, the scroll compressor compresses the refrigerant or the like by the movable compression chamber which is gradually movable toward the center in response to the orbiting movement of the orbiting scroll. However, in this case, in order to obtain a good high compression ratio, it is possible to deal with it by increasing the number of turns of the spiral body. However, since there is a problem that the outer diameter becomes large and the size becomes large,
In order to obtain a high compression ratio without increasing the outer diameter, for example, Japanese Patent Publication No. 60-17956 is known. That is, as shown in FIG. 7, one spiral body 101
Is a high dimension H1 on the outer circumference side and a low dimension H on the inner circumference side.
0, and the spiral body (not shown) is formed so as to gradually decrease from the outer end 103 to the inner end 105, while the other spiral body (not shown) gradually increases from the outer end to the inner end. 101 has a stepped shape, and the height in the axial direction of the compression chamber is also reduced during the compression process. However, since the spiral body 101 has a stepped shape, it is difficult to manage the seal of the step portion, and high processing accuracy is required.

Therefore, it is an object of the present invention to provide a scroll compressor capable of improving the sealing property in the step portion area without requiring high processing accuracy.

[0005]

In order to achieve the above-mentioned object, according to the present invention, a swirl body is provided on a general surface of a substrate, which spirally rises from the outside toward the center, and swirl is possible. The scroll and the fixed scroll fixedly supported are meshed with each other to form a movable compression chamber with a progressive decrease in volume toward the center corresponding to the orbiting motion of the orbiting scroll. In a scroll compressor in which one of the spiral bodies is formed so as to gradually increase from the outer end to the inner end, while the other spiral body is formed so as to gradually decrease from the outer end to the inner end, In the vicinity of the stepped portion of the one spiral body, a bulge portion having a diameter larger than the thickness of the spiral body and having an arc-shaped action surface is provided, while the bulge portion is in contact with the action surface of the bulge portion and has an arc shape The large arcuate recess surface than use surface is provided near the step portion of the other of the spiral body. Further, as another embodiment, a tip seal portion having an arc-shaped working surface is provided in the step portion of the one spiral body, while an arc-shaped concave portion that contacts the tip seal portion is provided in the step portion of the other spiral body. The tip seal portion is biased by a biasing member so as to come into pressure contact with the arc-shaped recess.

[0006]

According to such a scroll compressor, at the stepped portion of each spiral body, the working surface of the bulging portion, which is larger than the thickness of the spiral body, comes into contact with the concave surface, so that both sides of the working surface extend along the concave surface. A large lubricating oil holding area is secured, and the lubricating oil in the lubricating holding area ensures the sealing of the contact portion between the working surface and the concave surface.

On the other hand, in the tip seal portion according to another embodiment, the biasing member presses the concave portion strongly to secure a reliable seal at the contact portion.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings of FIGS.

In the figure, reference numeral 1 denotes a closed case having a suction pipe 3 and a discharge pipe 5. Inside the closed case 1, a drive unit 7 is provided at an upper portion, a compressor unit 9 is provided at a lower portion, and a lower portion is provided.
Lubricating oil has been injected to a predetermined level.

The drive unit 7 has a rotor 15 fixed to a rotatable main shaft 13 supported by a main bearing 11, and a stator 17 fixed to the sealed case 1 side.
When a current flows through the main shaft 1 through the rotor 15
The rotation power is given to 3.

The compressor unit 9 is composed of a fixed scroll 19 and an orbiting scroll 21, and the fixed scroll 19 spirally spirals from the outside to the center of a substrate 25 fixedly connected to the main bearing 11 by a bolt 23. The body 27 has a rising shape.

The spiral body 27 has a low outer dimension,
On the inner peripheral side, as a high dimension, it has a two-stepped shape in which the height gradually increases from the outer end 27a toward the inner end 27b at the center. As shown in FIG. 1, the spiral body 27 has a bulging portion 2 having a diameter larger than the thickness of the spiral body 27 near the step portion.
8 is formed, and the working surface 30 of the bulging portion 28 is provided in the vicinity of the step portion of the scroll 35 on the side of the orbiting scroll 21 and is in contact with the concave surface 34 larger than the working surface 30.

The substrate 25 of the fixed scroll 19 is
It is fixedly supported in the closed case 1 together with the main bearing 11.

On the other hand, in the orbiting scroll 21, the spiral body 35 rises in a spiral shape from the outside of the substrate 31 toward the center, and is gradually lowered from the outside outer end 35a toward the center inner end 35b. It has a stepped shape.

A swollen body 35 is formed with a swollen portion 38 having a diameter larger than the thickness of the swirl body 35, and the working surface 4 of the swollen portion 38 is formed.
0 is in contact with a concave surface 42 that is larger than the working surface 40 provided near the step portion of the scroll 27 on the fixed scroll 19 side.

As a result, the movable compression chamber 41 is formed in correspondence with the orbiting movement of the orbiting scroll 21 and gradually decreasing in volume toward the center. Compression chamber 4
Reference numeral 1 is adapted to communicate with the suction pipe 3 and also with the discharge pipe 5 through a connection passage (not shown) which penetrates the main shaft 13 at the central portion.

The bearing portion 45 of the orbiting scroll 21 has an eccentric shaft portion 49 which is eccentric to the main shaft axis W of the main shaft 13 by a predetermined amount.
Oldham mechanism 5 that allows swivel motion while being fixedly inserted into
Held by two. As a result, the orbiting scroll 21 is given a orbiting motion without rotation.

According to the scroll compressor thus constructed, the orbiting scroll 21 orbits due to the rotational power applied to the main shaft 13, and the compression chamber 41 compresses the refrigerant taken in from the suction pipe 3 and discharges it. It comes out from the tube 5. During this operation, for example, as shown in FIG.
As shown in FIG. 5, the lubricating oil retaining regions a and b are formed on both sides of the working surface 40 along the concave surface 42. Therefore, even if the stepped portion does not require high processing accuracy, the large lubricating oil holding regions a and b can ensure the seal without causing the oil film shortage.

5 and 6 show a second embodiment.

In this embodiment, the orbiting scroll 21 is used.
A tip seal portion 53 having an arcuate working surface 51 is provided in the step portion of the spiral body 35 on the side.
Is urged by an urging member 57 such as a spring against the arcuate recess 55 on the fixed scroll 19 side. As a result, a structure is ensured in which the working surface 51 of the tip seal portion 53 is in strong contact with the recess 55.

Therefore, according to this embodiment, since the tip seal portion 53 is ensured to be in strong contact with the concave portion 55, the inner peripheral side chamber V1 and the outer peripheral side chamber V2 are highly machined as shown in FIG. Even if precision is not required, a reliable sealed state can be secured.

[0022]

As described above, according to the scroll compressor of the present invention, it is possible to improve the sealing property of the step portion area without requiring high processing accuracy.

[Brief description of drawings]

FIG. 1 is a cross-sectional plan view of a scroll compressor embodying the present invention in which a fixed scroll side spiral body and an orbiting scroll side spiral body are engaged with each other.

FIG. 2 is a sectional view of a scroll compressor embodying the present invention.

FIG. 3 is a sectional view of an orbiting scroll.

FIG. 4 is an operation explanatory view of an operation surface of a bulge portion.

FIG. 5 is a perspective view of the tip seal portion showing the second embodiment.

FIG. 6 is a schematic plan view of the above.

FIG. 7 is a sectional view of an orbiting scroll showing a conventional example.

[Explanation of symbols]

 19 Fixed scroll 21 Orbiting scroll 40 Working surface 42 Recessed surface 51 Working surface 53 Tip seal portion 55 Recessed portion 57 Energizing member

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kanji Sakata 8 Shinsugita-cho, Isogo-ku, Yokohama-shi, Kanagawa Incorporated, Toshiba Living Space Systems Engineering Laboratory (72) Inventor Makoto Hayano 8 Shinsugita-cho, Isogo-ku, Yokohama, Kanagawa Address Stock Company, Toshiba Living Space Systems Research Laboratory (72) Inventor Naoya Ryakuzumi 8 Shinsita-cho, Isogo-ku, Yokohama, Kanagawa Prefecture

Claims (2)

[Claims] 1. A swirl motion of a swirl scroll in which a swirl scroll that rises spirally from the outside toward the center is provided on a general surface of a substrate and can swivel and a fixed scroll that is fixedly supported are meshed with each other. Corresponding to the above, a movable compression chamber is formed in which the volume gradually decreases toward the center, and the scroll body of either the fixed scroll or the orbiting scroll is gradually increased from the outer end to the inner end. On the other hand, in the scroll compressor in which the other spiral body is formed so as to be gradually lowered from the outer end to the inner end, in the vicinity of the stepped portion of the one spiral body, the diameter is larger than the thickness of the spiral body. , A bulging portion having an arc-shaped working surface is provided, and an arc-shaped concave surface that is in contact with the working surface of the bulging portion and is larger than the arc-shaped working surface is provided near the step portion of the other spiral body. A scroll compressor characterized in that 2. A revolving scroll of a revolving scroll in which a revolving scroll having a spiral body rising from the outside toward the center is provided on a general surface of a substrate and capable of revolving motion and a fixed scroll fixedly supported are meshed with each other. Corresponding to the above, a movable compression chamber is formed in which the volume gradually decreases toward the center, and the scroll body of either the fixed scroll or the orbiting scroll is gradually increased from the outer end to the inner end. In the scroll compressor in which the other spiral body is formed so as to gradually lower from the outer end to the inner end, a tip seal portion having an arc-shaped action surface at the step portion of the one spiral body is formed. On the other hand, an arc-shaped concave portion that comes into contact with the tip seal portion is provided in the step portion of the other spiral body, and the tip seal portion is provided with respect to the arc-shaped concave portion by the biasing member. A scroll compressor characterized by being urged to press.