JPH0245672A - Scroll fluid machine - Google Patents

Abstract

PURPOSE:To decrease vibration and noise by providing a swivel bearing structure arranged slidably in a receiving groove, formed in a rotary drive shaft, and connected to a swivel shaft. CONSTITUTION:A swivel bearing structure 80 supports a swivel shaft 80 while provides a protruded part 81, fitted to a recessed part 71 in a receiving groove 70, being slidably arranged in a direction of eccentrically moving in the receiving groove 70 or in the opposite direction. A spacer 85 is provided interposing between an eccentric side surface of the receiving groove 70, provided in the end surface in a side of a swivel scroll 20 of a rotary drive shaft 30, and the swivel bearing structure 80. By adjusting a thickness of this spacer 85, a clearance is decreased to a minimum, and a swivel radius is kept to a fixed value. Accordingly, both volute members are operated contactlessly, so that vibration and noise are reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a scroll fluid machine, and particularly to a t-scroll fluid machine that reduces vibration and noise, has a relief function, and improves reliability.

[Conventional technology]

First, the principle of a scroll fluid machine will be explained. A scroll fluid machine changes the total volume of fluid by moving two spiral bodies relative to each other, and FIG. 4 shows the principle of operation when used as a compressor. This type of scroll compressor has already been disclosed in many documents and patent publications, and its principle is well known.

Figure 4 shows, for example, the Mitsubishi Electric Technical Report (VAT, 58.NO
・5゜1984, pp. 367-371), and in Figure 2, αQ is a fixed scroll that is stationary with respect to space and has a spiral body, and ■ is a fixed scroll that meshes with the spiral body of the fixed scroll. It is an oscillating scroll that has nine spiral bodies and performs rotational movement, that is, oscillating movement, at a predetermined crank radius (oscillating radius) without changing its attitude with respect to space. The fixed scroll αQ and the oscillating scroll are composed of a single vortex having the same shape, and the shape thereof is a combination of conventionally known techniques such as an involute or a circular arc. The chrysanthemum is a compression chamber that compresses fluid by the above-mentioned rocking motion, and a discharge port that discharges uncompressed fluid. Here, if both scrolls move in the directions of lal, ibl, fat, and ldl in FIG.
The fluid suddenly taken in is compressed and discharged from the chamber (discharge donkey 1).

The above is the operating principle of the scroll fluid machine. Is Figure 5 a conventional scroll fluid machine? It is a diagram showing a basic and refurbished cross-section of the compressor used as a compressor, and FIG. 6 is a diagram showing an enlarged cross-section of its main parts. Both figures Vc's? , α0 and c! n is the above-mentioned fixed scroll and swinging scroll. 1211: An oscillating shaft provided on the opposite side of the spiral body of the oscillating scroll ω, ω is a rotary drive shaft that is rotated by the electric motor Cl1l that is the driving source of the oscillating motion, and is opposed to the oscillating scroll ■. Swing axis I2] +? The balance weight ■ which provides support and maintains dynamic balance is fixed M. vFi inlet is inhaled and 7 is fluid? Compression chamber to be compressed, l is compressed fl, 几fluid? This is a discharge port for discharging. - is the axial clearance at the tip of the wall of the spiral body of both scrolls! Th sealing chip seal, ω is an Oldham joint that prevents the rotation of the oscillating scroll ω and maintains the angular position between the fixed scroll αQ and the oscillating scroll, (51) is the internal pressure of the compression 1i1 (rotation) and the oscillating scroll. ■It is an annular thrust bearing that supports its own weight. (60) An oil pump attached to the lower part of the rotational drive shaft supplies lubricating oil to each bearing part through the oil supply hole (61). When power is supplied to the motor, it generates torque and rotates the end of the rotary drive shaft.

This rotational force is transmitted to the swinging shaft, and the swinging scroll (2) is guided by the Oldham coupling group and performs a swinging motion without rotating on its own axis, and the L-shaped compression action shown in FIG. 4 is performed.

By the way, in a scroll fluid machine 2, Tfi, from the viewpoint of reliability, if the pressure in the compression chamber 1 increases abnormally due to liquid compression etc.
Sometimes the pressure is reduced by opening a gap between the walls of both vortex bodies.
J It is important to have leaf function money. In this regard, the basic model shown in FIGS. 5 and 6 has almost no relief function because the range in which the swing radius can be changed is determined only by the bearing clearance. On the other hand, in the device described in Japanese Unexamined Patent Publication No. 59-162383, etc., the swing radius is made variable so that the wall surfaces of the spiral body are brought into contact with each other, and a relief function is also provided.

[Problem to be solved by the invention]

In the above-mentioned complicated conventional scroll fluid machines, the contact between the wall surfaces of the spiral body causes vibrations, noise, and wear on the spiral body wall, and it is difficult to attenuate when the oscillation radius changes. Sometimes there is a problem that vibration noise is aggravated, so this invention was made to solve this problem, and it reduces vibration and noise, improves reliability, reduces vibration and noise, and improves the reliability of the scroll fluid. The purpose is to obtain a machine.

[Defined means to solve problems]

A scroll fluid machine according to the present invention includes a fixed scroll having a first spiral body, a second spiral body meshed with the first spiral body on one surface, and a swing shaft on the other surface. An oscillating scroll that oscillates, and a receiver having a concave or convex portion on the end face opposite to the oscillating scroll, located in a direction opposite to the direction of eccentricity during the oscillating movement.
It has a rotary drive shaft that rotates with Il'Jk, and six grooves or recesses that support the swing shaft and fit into the recesses or protrusions of the receiving groove, and slide into the receiving groove. The present invention includes a swing bearing body which is freely disposed and connects the rotary drive shaft and the swing shaft.

[Effect]

In the second aspect of the present invention, the closed space formed by the concave-convex fitting portion provided between the swing bearing body and the receiving groove at the end of the rotary drive shaft changes the swing radius and buffers the next vibration.

〔Example〕

FIG. 1 is an enlarged view showing nine longitudinal sections of the main parts of a scroll fluid machine according to an embodiment of the present invention, and FIG.
-It is a diagram showing a cross section of part ■, and in the figure 2, cio~
(61) Fi This is similar to the conventional example. (70)/I
It is a companion groove provided on the end face of the i-rotational drive shaft (2) facing the rocking scroll, and has a recessed portion (71) on the side face opposite to the direction of eccentricity during rocking motion. (80) supports the swing shaft e2TJ' and has a convex part (81)'f: that fits into the recessed part (71) of the receiving part (70), and the receiving part R(
This is a swing bearing body that connects the rotary drive shaft 1 and the swing shaft 1211 by disposing it in a sliding groove in the direction in which the inside of the shaft 70 is eccentric or in the opposite direction. (85) is the receiving f in the eccentric direction
This is an intervening member such as a spacer that is interposed between the side surface of the i (70) and the swing bearing body (8o) to adjust the gap when avoiding contact between the wall surfaces of the roll body. (91
) is an oil supply hole that allows lubricating oil supplied through the oil supply hole (61) in the rotational drive shaft ω to flow into the recessed portion (71) provided in each bearing portion or receiver 11 (70>); (92)
is a screw that closes the end of the oil supply hole (91).

It is composed of the above Eri, and there are 2 in the nine-scroll fluid machine,
First of all, when the pressure inside the compressor rises abnormally due to liquid compression, etc., the gap between the walls and sides of the spiral body increases. Open and depressurize +
J I)-7 Explaining the functions O Generally, in an oscillating scroll fluid machine, the centrifugal force generated by the oscillating scroll and the fluid pressure inside the compression chamber are affected by the differential pressure between the outside and the outside. The fluid pressure as an integral of the force pushing on the spiral wall acts as shown in FIG. That is, the centrifugal force (Fc) increases the radius of oscillation (Rr), the radial component of fluid pressure (Fgr) decreases the radius of oscillation (Rr), and the circumferential component of fluid pressure (Fgo) They each act in the direction that acts as a rotational load on the rotational drive shaft.

For normal operation, the radial component of fluid pressure (f'g
r) J: The body has a superior centrifugal force (Fa) and works in the direction in which the radius of oscillation (Rr) increases, that is, the vortex and the gap between the side walls of the body become smaller.

Furthermore, in Example 2 shown in FIG. 1 and ts2,
Lubricating oil flows through the oil supply hole (cn) t- through the narrow portion around the convex portion (81) of the swing bearing body (8o). The oscillating bearing body (80) has a oscillating radius (Rr) 'r: increasing direction, that is, the same direction as the centrifugal force (Fc). Hydraulic pressure (F'o) acts. Since this hydraulic pressure (Fo) Vi is determined by the oil flow rate and the width of the constriction, for example, when operating at variable speed, it can be set to L to compensate for insufficient centrifugal force at low speeds.

At this time, when the pressure in the compression chamber becomes abnormally high due to liquid compression, etc., the fluid pressure increases and the radial component (Fgr) of the fluid pressure increases with the centrifugal force (Fc) and the hydraulic pressure (Fo
). Therefore, the swing bearing body (8
0) moves inward to the swing radius (Rr)! Because it reduces f! A gap is created between the side walls of the 6-roll body, and a relief function can be achieved.

Next, we will explain how to suppress vibrations and noise, especially vibrations that occur when the swing radius changes. First of all, during normal operation, the spiral body! It is best to set the swing radius so that the radial clearance i is minimized within the range where two surfaces do not contact each other.
Delicious.

Ninthly, in the embodiment 2 shown in FIGS. 1 and 2, the eccentric side surface of the t receiving portion (70) and the oscillating bearing are provided on the end face of the oscillating scroll c2I3H of the rotary drive shaft (3). body (a
)) A spacer (85) or the like is interposed between them.

By adjusting the thickness t-a of this spacer (C section), the clearance becomes minimal and the swing radius is kept constant. Therefore 2
Since both spiral bodies are operated with north contact, vibration and noise are reduced. On the other hand, during operation, contact with the wall surface may occur due to foreign matter getting caught or shape errors! Or, if the fluid pressure increases and t, then j? In this case, the swing bearing body (8o) moves in the direction of reducing the swing radius within the receiver II (70) to provide relief, and then quickly returns to its original position. At this time, Uke II (70) is a nearly closed space.
The recessed portion (71) acts as a damper, and the rocking bearing body (
80). Furthermore, as shown in FIG. 1, the damper effect can be increased by filling the recess (71) with lubricating oil through the oil supply hole (91).

In the above embodiment, a spacer metal is used to adjust the gap between the wall surfaces of the spiral body and the thickness is changed. However, if the accuracy of machining and assembly of the spiral body is improved, a spacer can be inserted. 〇 [Effects of the Invention] This invention has been explained above. An oscillating scroll that has a oscillating shaft on the other surface and that oscillates, and a side surface that is located in the opposite direction to the direction of eccentricity during the oscillating movement, on the end surface facing the oscillating scroll. A rotary drive shaft that rotates with a receiver N & having a concave or convex portion on the receiving groove; and a rocking bearing body that is slidably disposed in the receiving groove and connects the rotary drive shaft and the rocking shaft, thereby reducing vibration and noise and providing a relief function. This has the effect of improving reliability.

[Brief explanation of the drawing]

FIG. 1 is an enlarged longitudinal cross-sectional view of the main parts of a scroll fluid machine according to an embodiment of the present invention, FIG. 2 is a diagram showing a complete cross-section of the embodiment of FIG. 1, and FIG. An explanatory diagram showing the relationship of forces acting on the moving scroll, Fig. 4 is the scroll A/f
11. FIG. 5 is a diagram showing the longitudinal cross section of the entire conventional scroll fluid machine, and FIG. 6 is a diagram showing an enlarged cross section of the main part of FIG. 5. In the figure, 0.0 is a fixed scroll, ■ is an oscillating scroll, QJJ is an oscillating axis, (3+) is a rotating drive axis, (
70) is a receiving groove, and (80) IIi is a swing bearing body. 12. In each figure, the same reference numerals indicate the same parts, and the numbers indicate corresponding parts.

Claims (1)

[Claims] A fixed scroll having a first spiral body; an oscillating scroll having a second spiral body meshed with the first spiral body on one surface and a rocking shaft on the other surface; A rotary drive shaft that rotates and has a receiving groove having a concave or convex portion on a side surface located in a direction opposite to the direction of eccentricity during the rocking motion, on an end face facing the rocking scroll, and the rocking shaft. and a convex or concave portion that fits into a concave or convex portion of the receiving groove, and is slidably disposed within the receiving groove and supports the rotary drive shaft and the swing shaft. A scroll fluid machine characterized by comprising a swing bearing body that connects the scroll fluid machine.