JPH07279865A - Scroll-type compressor - Google Patents

Abstract

PURPOSE:To simply form a gap between the tip end of a spiral lap and an end plate by fastening a bolt so as to deform a stationary scroll attachment surface of a stationary member so that the center part thereof is displaced away from a turnable scroll facing thereto. CONSTITUTION:An attachment surface 11 positioned at an end face of a stationary scroll attaching part 10 which is a part of a conical surface, and is made into contact with an attachment surface 11 of a frame 3 after a turnable scroll is meshed with a stationary scroll 1, and a flange part 13 is attached to a stationary scroll attaching part 10. Next, when a bolt 16 is screwed into a bolt hole 12, a planar attachment surface 14 is made into close contact with a conical attachment surface so that the stationary scroll is fixed to the frame 3. Further, the tip end of a spiral lap in the center part of one of the stationary scrolls meshed with each other in pair is slightly separated from an end plate of the other of the stationary scrolls so as to define a slight gap therebetween. As a result, it is possible to prevent galling without leakage in a simple structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type fluid machine.

[0002]

2. Description of the Related Art FIG. 6 is a vertical sectional view of a conventional scroll type compressor. In the figure, 7 is a housing, 3 is a frame fixed to the same housing, 1 is a fixed scroll fixed to the same frame with bolts, and 2 is a portion enclosed by the frame and the fixed scroll. Is a orbiting scroll having a spiral wrap 2A meshing with the spiral wrap 1A, 6 is a motor stator, 5 is a motor rotor, and 4 is a shaft which rotates together with the motor rotor and which transmits the driving force of the revolution orbiting motion to the orbiting scroll.

In the fluid machine of the present invention, when the orbiting scroll orbits, the gas is taken from the outer peripheral portion of the scroll into the compression chamber formed by the spiral wraps and end plates of both scrolls, and reaches the center of the compression chamber. Of the fixed scroll and is discharged from the discharge port 8 at the center of the end plate of the fixed scroll.

In the scroll type fluid machine, since the gas is sucked from the outer peripheral portion of the scroll and discharged from the central portion as described above, the temperature of the central portion of the scroll becomes higher due to compression, and the central portion undergoes thermal expansion. To do. For this reason, in the stopped state, when the gap between the tip of the spiral wrap of each scroll and the end plate of the opposite scroll is meshed with a uniform gap size, when the operation is started, The tip of the wrap comes into contact with the mating end plate due to thermal expansion, and galling occurs, resulting in an inoperable state. If the gap between the tip of the wrap and the end plate on the mating side is made uniform to prevent this galling, leakage will increase and the performance of the fluid machine will deteriorate.

FIG. 7 is a cross-sectional view of a fixed scroll 1 of a scroll type fluid machine in which measures are taken to reduce the above leakage and prevent galling (Japanese Patent Publication No. 1-545).
No. 58). In the figure, 1A is a spiral wrap, 1
B is an end plate on which the spiral wrap is erected. In this example, in order to prevent the spiral wrap at the center of the scroll from thermally contacting with the end plate of the other scroll, the wrap height h should be lowered in advance toward the center along the spiral. , The tip of the wrap is shaved.
Therefore, the wrap tip position has a shape that is retracted toward the end plate side by d from the wrap tip position of the outer peripheral portion as it goes to the center of the scroll. That is, d becomes larger toward the central portion along the spiral. With this, when the fluid machine is stopped, a large gap is formed between the lap tip and the mating end plate toward the center, and when the operation reaches a steady state, the gap between the lap tip and the mating end plate is formed. Be uniform. The above-described processing of the wrap tip portion is also applied to the orbiting scroll.

[0006]

DISCLOSURE OF INVENTION Problems to be Solved by the Invention The above-mentioned conventional technique for providing a gap between the tip of the central portion of the spiral wrap of a scroll of a scroll type fluid machine and the end plate of the scroll which is opposed to the scroll wrapping machine is described in On the other hand, it is necessary to perform machining of fine dimensions. This processing requires high-precision processing technology, requires a long time for processing, and is expensive.

The present invention seeks to provide a simple means for providing a gap between the scroll wrap tip at the center of the scroll and the opposing end plate of the scroll.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a pair of fixed scrolls and orbiting scrolls are meshed with each other, and the fixed scrolls are fastened and fixed to a fixing member such as a frame or a housing with bolts. In addition, the present invention relates to a scroll type fluid machine that orbits an orbiting scroll and has the following features. (1) The fixed scroll mounting surface of the fixed member such as the frame or the housing is formed so that the center portion of the fixed scroll is deformed in a direction away from the facing orbiting scroll by tightening with the bolt. (2) In the scroll type fluid machine according to the item (1), the mounting surface is a conical surface. (3) In the scroll type fluid machine according to the item (1), the mounting surface is formed as a stepped surface. (4) In the scroll type fluid machine according to the item (1), the mounting surface is formed by an outer peripheral support surface of a fixed scroll and a tightening surface formed inside thereof, and the dimensions of both surfaces are:
By tightening with the bolts, the center portion of the fixed scroll is deformed in a direction away from the facing orbiting scroll.

[0009]

When the scroll type fluid machine is assembled, the mounting surface of the frame or housing is formed with a conical surface, a stepped surface or the like, or is formed with an appropriate size, so that the fixed scroll is deformed by tightening the bolts. However, when the fluid machine is stopped, a gap is generated between the tip of the spiral wrap at the center of the scroll and the end plate of the scroll that faces the scroll. This gap becomes uniform due to thermal expansion when the operation of the fluid machine reaches a steady state, and disappears.

[0010]

1 is a sectional view of a main member of a scroll type compressor according to a first embodiment of the present invention. In the figure, 3 is a frame, 1 is a fixed scroll, and 16 is a bolt connecting the fixed scroll 1 to the frame 3. 10 is a fixed scroll mounting portion provided around the frame 3,
Reference numeral 11 denotes a fixed scroll mounting surface located on the end surface. In this embodiment, the mounting surface 11 is formed by a part of the conical surface. Reference numeral 12 is a bolt hole into which the bolt 16 is screwed. Reference numeral 13 denotes a flange portion provided in the peripheral portion of the fixed scroll 1, and 14 denotes a mounting surface located at the end surface thereof, which is formed in a flat shape. The mounting surface 14 is a portion that comes into contact with the mounting surface 11 of the conical surface when the bolt 16 is tightened. Reference numeral 15 is a through hole into which the bolt 16 is inserted. The inclination α of the mounting surface 11 shown in the drawing is exaggeratedly drawn with a large angle to help understanding of the principle of the present embodiment, but is actually a finer angle. The configuration other than the above is the same as the conventional technique.

In this embodiment, an orbiting scroll (not shown) is engaged with the fixed scroll 1, the fixed scroll 1 is brought into contact with the mounting surface 11 of the frame 3, and a plurality of bolts 16 are used to form the flange portion 13 of the fixed scroll. To the fixed scroll mounting portion 10 of the frame. When the bolt 16 is screwed into the bolt hole 12 and tightened, the flat mounting surface 14 comes into close contact with the conical mounting surface 11, and the fixed scroll 1 is fixed to the frame 3. At this time, the central portion of the end plate 1B of the fixed scroll is deformed in a convex shape outward and curved in a direction away from the frame 3, that is, in a direction away from the orbiting scroll 2. The tips of the spiral wraps near the center of the pair of scrolls that mesh with each other are very slightly away from the mating end plates, and there is a gap there.

FIG. 2 is a cross-sectional view of the main parts of the scroll compressor assembled in this manner and in a state where a gap is created between the wrap tip and the end plate near the center of the scroll.
Reference numeral 17 is a gap generated during the assembly. The gap 17 is maximum at the central portion of the scroll and becomes smaller toward the periphery. Although the above-mentioned gap dimension is exaggeratedly drawn large in the drawing, it is actually small.

When the scroll compressor of this embodiment is operated, the center of the scroll becomes hot due to gas compression.
This causes the spiral wrap near the center to thermally expand in the axial direction of the compressor. The gap 17 generated by the deformation of the end plate is reduced by the thermal expansion, and when the operation of the compressor reaches a steady state, the gap between the central portion of the scroll and the peripheral portion of the scroll becomes uniform, and the gap disappears. There is no leakage. No galling will occur.

According to the present invention, since the leakage can be prevented and the galling can be prevented by the above-mentioned simple means, the manufacturing time and cost of the scroll type compressor can be reduced.

FIG. 3 is a sectional view of a frame of a scroll type compressor according to a second embodiment of the present invention. In the frame 3 of this embodiment, the mounting surface 20 formed at the end of the fixed scroll mounting portion 10 of the frame is formed as a ring-shaped step surface. The configuration of the other parts is the same as that of the first embodiment.

In this embodiment, when the bolt 16 (see FIG. 1) for attaching the fixed scroll 1 to the frame 3 is tightened, the mounting surface 14 (see FIG. 1) of the fixed scroll 1 is fixed.
Is supported by the outer edge portion 21 of the mounting surface 20 of the frame 3 and the inner protruding portion 22 (see FIG. 3), so that the flange portion 13 of the fixed scroll is inclined, whereby the center portion of the end plate of the fixed scroll is outward. Convex deformation to frame 3,
It curves in a direction away from the orbiting scroll 2, that is, a direction away from the orbiting scroll 2. This creates a small gap between the tip of the spiral wrap and the end plate of the other scroll,
The same effect as the first embodiment is obtained.

FIG. 4 is a sectional view of the essential parts of a scroll type compressor according to a third embodiment of the present invention. In the figure, 7 is a housing, 1 is a fixed scroll, and 2 is an orbiting scroll. The fixed scroll 1 of this embodiment is attached to the housing 7. Reference numeral 30 denotes a fixed scroll mounting surface on the housing side, which is formed by a part of a conical surface. Reference numeral 31 denotes a mounting surface on the fixed scroll side, which is formed in a flat shape. 32 is a bolt for connecting and fixing the housing and the fixed scroll.

In this embodiment, since the mounting surface 30 on the housing side is formed as a conical surface, when the bolt is tightened, the outer peripheral side of the mounting surface 31 of the fixed scroll first comes into contact, and then the fixed scroll deforms. Then, the mounting surface comes into full contact. The deformation of the fixed scroll is a deformation in which the central portion of the end plate is curved in a direction away from the orbiting scroll 2. As a result, a minute gap is created between the tip of the spiral wrap and the end plate of the opposite scroll, and the same effect as in the first embodiment is obtained.

FIG. 5 is a sectional view of the essential parts of a scroll type compressor according to a fourth embodiment of the present invention. Also in this embodiment,
The fixed scroll 1 is attached to the housing 7. Reference numeral 40 denotes a mounting surface on the housing 7 side, and 41 denotes a mounting surface on the fixed scroll 1 side, both of which are formed in a flat shape. A minute gap 42 is provided between the two mounting surfaces. 43 is a mounting bolt. Reference numeral 44 is a support surface for the fixed scroll and the housing.

In this embodiment, when the bolts 43 are tightened to attach the fixed scroll 1 to the housing 7, the fixed scroll comes into contact with the housing 7 at the support surface 44 and deforms while shrinking the gap 42. Mounting surface 4
The deformation ends when a part of 0 and 41 contact each other, but the deformation of the fixed scroll 1 at this time is a deformation in which the central portion of the end plate bends in the direction away from the orbiting scroll 2. As a result, a minute gap is created between the tip of the spiral wrap and the end plate of the opposite scroll, and the same effect as in the first embodiment is obtained.

[0021]

In the scroll type fluid machine of the present invention, the fixed scroll mounting surface of the fixed member such as the frame or the housing is deformed in the direction in which the central portion of the fixed scroll moves away from the facing orbiting scroll by tightening with bolts. , For example, since it is formed with a conical surface, a stepped surface, or a specific size, the fixed scroll is deformed by tightening bolts, and the fixed scroll is deformed between the tip of the spiral wrap at the center of the scroll and the end plate of the opposite scroll. , A gap can be easily provided.

[Brief description of drawings]

FIG. 1 is a sectional view of a main member according to a first embodiment of the present invention.

FIG. 2 is a sectional view of an essential part of the above embodiment.

FIG. 3 is a sectional view of a frame according to a second embodiment of the present invention.

FIG. 4 is a sectional view of a main part according to a third embodiment of the present invention.

FIG. 5 is a sectional view of an essential part according to a fourth embodiment of the present invention.

FIG. 6 is a vertical cross-sectional view of a conventional scroll compressor.

FIG. 7 is a sectional view of a conventional fixed scroll.

[Explanation of symbols]

 1 Fixed scroll 1A Spiral wrap 1B End plate 2 Orbiting scroll 3 Frame 4 Shaft 5 Motor rotor 6 Motor stator 7 Housing 8 Discharge port 10 Fixed scroll mounting part 11 Mounting surface (conical surface) 12 Bolt hole 13 Flange part 14 Mounting surface (flat surface) ) 15 through hole 16 bolt 17 gap 20 mounting surface (step surface) 21 outer edge portion 22 inner protruding portion 30 mounting surface (conical surface) 31 mounting surface (flat surface) 32 bolt 40 mounting surface (flat surface) 41 mounting surface (flat surface) 42 Gap 43 Bolt 44 Supporting surface

Claims (4)

[Claims] 1. A scroll type fluid machine in which a pair of fixed scrolls and an orbiting scroll are meshed with each other, the fixed scroll is fastened and fixed to a fixing member such as a frame or a housing by bolts, and the orbiting scroll is revolved. A scroll-type fluid machine characterized in that the fixed scroll mounting surface of a fixing member such as a housing is formed so that the central portion of the fixed scroll is deformed in a direction away from the facing orbiting scroll by tightening with the bolt. 2. The scroll type fluid machine according to claim 1, wherein the mounting surface is a conical surface. 3. The scroll type fluid machine according to claim 1, wherein the mounting surface is a stepped surface. 4. The mounting surface is formed by an outer peripheral portion supporting surface of a fixed scroll and a tightening surface formed inside thereof, and the dimensions of both surfaces are opposed by the central portion of the fixed scroll by tightening with the bolt. It is formed so as to be deformed in a direction away from the orbiting scroll.
The scroll type fluid machine described in.