JPH01253579A - Scroll fluid machine - Google Patents

Abstract

PURPOSE:To reduce vibration by forming a bearing on an end plate and matching the position of the center of gravity of a rotary scroll with the center position of this bearing in a scroll fluid machine using the rotary scroll with laps on both sides of an end plate. CONSTITUTION:A compression mechanism section constituted of a rotary scroll 2 provided with laps 2b and 2b on both sides of an end plate 2a and a pair of fixed scrolls 3 and 4 arranged on both sides of it and provided with a lap only on one side is stored at the upper section in an enclosed case 1, a motor 10 constituted of a rotor 11 and a stator 12 is stored below it. In a scroll fluid machine thus constituted, a bearing 8 is formed at the center of the end plate 2a of the rotary scroll 2, the eccentric upper portion of a shaft 9 to drive the rotary scroll 2 is coupled with this bearing 8. Through holes 13a and 13b with different sizes to adjust the center of gravity and match with the center of the bearing 8 are formed at appropriate positions on the rotary scroll 2.

Description

[Detailed Description of the Invention] [Purpose of the Invention (Industrial Application Field) The present invention relates to a scroll fluid machine that uses an orbiting scroll having wraps on both sides of the end plate to pump fluid on both sides of the end plate. be.

(Prior Art) In a scroll fluid machine using an orbiting scroll having wraps on both sides of the end plate as described above, the wraps of the conventional orbiting scroll are asymmetrical in plan view, so that the center of the orbiting scroll, that is, the bearing The center and the center of gravity of the orbiting scroll do not match.

(Problem to be Solved by the Invention) In cases where the center of the scroll and the center of gravity of the scroll do not coincide with each other, when the orbiting scroll is driven, the distance between the center of rotation and the center of gravity of the scroll changes every moment. There has been a problem in that the acting centrifugal force fluctuates and vibrations occur, and this tendency becomes more pronounced especially during high-speed rotation.

The present invention was made to solve the above problems, and an object of the present invention is to provide a scroll fluid machine in which the centrifugal force acting on the center of rotation of the orbiting scroll can be made constant and vibration is reduced.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides a scroll fluid machine that uses an orbiting scroll having wraps on both sides of the end plate and performs a fluid pumping action on both sides of the end plate. A bearing is formed on the end plate, and the center of gravity of the orbiting scroll is aligned with the center of the bearing.

A typical means for aligning the center of gravity of the orbiting scroll with the center of the bearing is to form a plurality of through holes in the end plate to adjust the center of gravity.

(Function) As described above, by aligning the center of gravity of the orbiting scroll with the center position of the bearing of the orbiting scroll, the distance between the center of gravity of the scroll and the center of rotation can be made constant, so that the distance acting on the center of rotation can be kept constant. can.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In Fig. 1, reference numeral 1 denotes a sealed case, and in the upper part of the case 1 there is an orbiting scroll 2 having wraps 2a and 2b on both sides of an end plate 2a, and a wrap provided on only one side of the scroll scroll 2. A compression mechanism section is constituted by a pair of fixed scrolls 3 and 4. An orbiting scroll 2 and a pair of fixed scrolls 3゜4 create an orbiting flow/L/2.
A plurality of compression chambers 5 are formed on both sides of the scroll, and the volumes of these compression chambers 5 are reduced by causing the orbiting scroll 2 to perform an orbiting motion without rotation relative to the fixed scrolls 3 and 4. The fluid changes to compress the fluid. 6 is a fluid suction port, and 7 is a fluid discharge port.

A bearing 8 is formed on the orbiting scroll 2, and an eccentric upper end portion of a shaft 9 for driving the orbiting scroll N2 is fitted into the bearing 8. Reference numeral 10 denotes an electric motor comprising a rotor 11 and a stator 12 and for driving the shaft 9. Further, 13a and 13b indicate through holes for adjusting the center of gravity of the orbiting scroll 2 and aligning it with the center of the bearing 8, as will be described in detail later.

FIG. 2 is an enlarged plan view of the orbiting scroll 2.
The wrap 2b is formed on the outer peripheral side of the bearing 8, and the through hole 13a
is provided on the central side of the wrap forming portion, and the through hole 13b is provided on the outer peripheral side of the wrap forming portion.

In this way, by selecting the size and position of the plurality of through holes 13a and 13b and forming them in the end plate 2a, the center of gravity of the orbiting scroll 2 can be aligned with the center of the bearing 8.

Therefore, when the orbiting scroll 2 is driven, the distance between the center of rotation of the orbiting scroll 2, that is, the center of the shaft 9, and the center of gravity of the orbiting scroll 2 is constant, and the centrifugal force acting on the center of rotation is constant, causing vibration. Never.

Next, FIG. 3 shows another example of the orbiting scroll used in the present invention, in which the wraps 2b and 2b are the end plate 2a.
Wrap the through hole 13C symmetrically on both sides of the
The space between the holes is also formed. In this way, the number of positions where the through holes are provided can be increased compared to the case shown in FIG. 2, so it is possible to more easily align the center of gravity of the orbiting scroll 2 with the center of the bearing 8. .

Note that the end plate 2a of the orbiting scroll 2 has a through hole 13a.

When 13b and 13c are provided, these through holes 13a
.

Since the pressure of the fluid on both sides can be made the same through 13b and 13c, the thrust force generated on the orbiting scroll 2 can be balanced, and the scroll fluid machine can operate smoothly.

Note that the present invention is not limited to the above-mentioned embodiments, and can be implemented with various modifications without changing the gist.

In any of the above embodiments, a plurality of through holes may be formed in the end plate to adjust the center of gravity of the orbiting scroll.

[Effects of the Invention] According to the present invention, the centrifugal force acting on the rotation center of the orbiting scroll can be made constant, and a scroll fluid machine with less vibration can be provided.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing a schematic configuration of an embodiment of the present invention, and FIGS. 2 and 3 are plan views showing different examples of the orbiting scroll used in the invention. 1... Case 2... Orbiting scroll 2a.
...End plate 2b...Wrap 3.4...Fixed scroll 5...Compression chamber 6...Suction port 7
...Discharge port 8...Bearing 9...Shaft

Claims (2)

[Claims] (1) In a scroll fluid machine that uses an orbiting scroll having laps on both sides of the end plate and performs a fluid pumping action on both sides of the end plate, a bearing is formed on the end plate and the center of gravity of the orbiting scroll is located at the center of the bearing. A scroll fluid machine characterized by matching. (2) The scroll fluid machine according to claim 1, wherein the center of gravity of the orbiting scroll is aligned with the center position of the bearing by forming a plurality of through holes in the end plate of the orbiting scroll.