JPH0220476Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a scroll-type fluid machine that can be used as a compressor or an expander.

1 and 2 show a scroll member of a conventional scroll type compressor, and 01 is a fixed scroll member which is vertically installed on a seal end plate 01b having a discharge port 05 approximately in the center and its inner surface 01d. It includes a spiral body 01a. 02 is a movable scroll member with a seal end plate 02b and its inner surface 02d.
A spiral winding body 02a having the same shape as the spiral winding body 01a is provided. Then, these pair of spiral bodies 01a, 02a are shifted in phase by 180 degrees from each other, and are overlapped with each other by a distance of 2ρ so that their surfaces contact and mesh with each other. The tip surfaces 01c, 02c are the inner surfaces 02d of the mating seal end plates 02b, 01b,
Close to 01d. Then, the movable scroll member 02 is caused to revolve around the center (corresponding to 0 in FIG. 1) of the spiral body 01a of the fixed scroll member 01 (corresponding to 0 in FIG. 1) by a crank mechanism having a radius ρ without rotating on its own axis. configured.

If the movable scroll member 02 is now revolved 90 degrees from the state shown in FIG. 3a, it will be in the state shown in FIG. 3b, if it is further revolved 180 degrees, it will be in the state shown in FIG. The state shown in Figure 3d is reached. During this time, Uzumaki bodies 01a, 02
Points a ₁ , b ₁ and a ₂ , b ₂ where the sides of a touch each other
The volumes of the closed chambers 03 and 04 formed between them gradually decrease, and in the state shown in FIG.
3 and 04 communicate with each other to form a small room 06. Figure 3d
When it revolves further 90 degrees from the state shown in FIG. 3 and the revolution angle becomes 360 degrees, the state shown in FIG. 3a is reached, and the volume of the small chamber 06 further decreases. As the movable scroll member 02 revolves, this small chamber 06 further expands in FIG.
The volume is reduced to the state shown in Figure 3c, and the third
The minimum volume is between Figure c and Figure 3D. Then, the seal end plate 01b of the fixed scroll member 01
Compressed gas is discharged within the small chamber 06 from a discharge port 05 provided approximately at the center of the chamber. The outer ends of the spiral bodies 01a and 02a are shown in FIG.
The outer space begins to open and takes in new fluid while moving to Figures 3c and 3d, and in Figure 3a, the outer edges of the spiral bodies 01a and 02a reach the opposite spiral body 0.
Contact with 2a and 01a at points a ₁ and a ₂ to close the closed chamber 0
3 and 04, and repeat this process thereafter.

In the above-mentioned conventional device, as shown in an enlarged view in FIG.
is perpendicular to. Therefore, this outer edge 01
e and 02e are in contact with the side surfaces of the opposite spiral bodies 02a and 01a to form closed chambers 03 and 04. That is, since the suction of gas is momentarily shut off, the pulsation of the gas in the suction passage becomes large, causing noise.

The present invention has been proposed to address the above problems, and its gist is that a spiral body is attached to the outer end of at least one of the movable scroll member and the fixed scroll member. A scroll-type fluid machine characterized by being provided with a notch whose height gradually decreases toward the outer end.

Since the present invention has the above structure, the closed chamber is gradually closed, which not only reduces the pulsation of the fluid in the passage communicating with the closed chamber, but also prevents the outer end of the spiral body from hitting abnormally. This ensures stable performance and improves durability.

An embodiment of the present invention is shown in FIG. 5, in which a diagonal notch 13 is provided at the tip of the outer end 12 of the scroll member 10 and the spiral body 11 to increase the height of the spiral body 10 toward the outer end 12. The fourth point is that it gradually decreased.
This is different from the conventional one shown in the figure.

Thus, even when the outer end 12 touches the side surface of the opposite spiral body, the notch 13 remains open.
As the scroll member continues to revolve further, the notch 13 gradually comes into contact with the side surface of the opposite spiral body. Therefore, since the suction gas is gradually shut off, the pulsation of the gas in the suction passage is reduced, and the height of the spiral body at the outer end of the spiral body, that is, the part where the wall thickness is minimum and the curvature is large, is reduced. Since it can be made lower, the rigidity of this part can be improved, and the shape error caused by the inner fall of this part, that is, the spring back, is reduced, and abnormal contact can be prevented and stable performance and durability can be ensured.

Note that the cutout 13 can be provided on both the spiral body of the movable scroll member and the fixed scroll member, but may be provided on either one.

[Brief explanation of the drawing]

1 and 2 show a scroll member of a scroll compressor, FIG. 1 is a cross-sectional view taken along the line - in FIG. 2, FIG. 2 is a cross-sectional view taken along the line - in FIG. 1, and FIG. The figure is a diagram showing changes in the relative positions of the movable scroll member and the fixed scroll member, Figure 4 is a perspective view of the outer end of the conventional scroll member, and Figure 5 corresponds to Figure 4 showing one embodiment of the present invention. This is a diagram. Scroll member...10, spiral body...11,
Outer end...12, Notch...13, Closed chamber...
…03,04.

Claims (1)

[Scope of utility model registration request] A scroll-type fluid, characterized in that a notch is provided at the outer end of at least one of the spiral bodies of the movable scroll member and the fixed scroll member to gradually lower the height of the spiral body toward the outer end. machine.