JPH03294682A - Scroll compressor - Google Patents

Abstract

PURPOSE:To position the center of gravity to the center of a driving shaft easily as well as to realize a light weight of a rotary scroll by regulating the area of a seat surface projected extending in the peripheral direction at the periphery of the rear side of an end plate of the rotary scroll. CONSTITUTION:A contact seat surface 5 extending in the peripheral direction from the periphery of the rear side of an end plate of a rotary scroll 1 is projected. And plural radial ribs 1c extending radially from a bearing boss 6 to the periphery of the end plate are projected, and connected with the sear surface 5. And, by making the depth of recesses 1d between the ribs constant, and regulating the area of the seat surface 5, the center of gravity of the rotary scroll 1 is nearly positioned on the center lines of the bearing bosses 6. Consequently, the centrifugal force of the rotary scroll 1 can be reduced, the vibration of the rotary scroll 1 can be also reduced, and a high speed rotation of the compressor is realized.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a scroll compressor used as a refrigerant compressor or an air compressor for refrigeration and air conditioning, refrigerators, etc.
In particular, reducing the weight of the orbiting scroll, which is essential for high-speed rotation.
Regarding balance adjustment.

[Prior Art] As is well known, in a scroll compressor, an orbiting scroll having an end plate and a spiral wrap and a fixed scroll are closely engaged with each other, and the rotation of the orbiting scroll is prevented by an anti-rotation mechanism. The orbiting scroll is configured to rotate relative to the rotary scroll.

Conventionally, both the fixed scroll and the orbiting scroll have been made of cast iron, and the orbiting scroll is heavy, so when operating at high rotational speeds, the bearing load due to the centrifugal force of the orbiting scroll increases, reducing the reliability of the compressor. invite

Therefore, in order to increase the rotation speed of the scroll compressor, attempts have been made to make the orbiting scroll made of a material with low specific gravity such as aluminum alloy as a conventional technique for reducing the weight of the orbiting scroll. As a conventional technique for aligning the center of gravity of an orbiting scroll with the center of the drive shaft, JP-A-58-11-08 discloses a technique in which unevenly distributed recesses are provided in an orbiting scroll end plate.
There is a 6th grade.

[Problems to be Solved by the Invention] However, when the orbiting scroll is made of aluminum alloy, which has a low specific gravity, in order to reduce the weight of the orbiting scroll,
Due to differences in thermal expansion coefficients of materials, it is necessary to provide a large gap at the end of the wrap of the orbiting scroll or fixed scroll, and it is necessary to provide a chip seal at the end of the wrap in order to seal between the sealed working chambers. Furthermore, the means used in JP-A-58-11086 to align the center of gravity of the orbiting scroll with the center of the drive shaft does not take into account the weight reduction of the orbiting scroll, which is necessary when operating at high rotational speeds. There wasn't.

An object of the present invention is to reduce the weight of an orbiting scroll and to easily align the center of gravity of the orbiting scroll to the center of the Ipl moving shaft, thereby providing a scroll compressor that is suitable for high-speed operation.

[Means for Solving the Problems] According to the present invention, a scroll compressor having the configuration described in each claim is provided.

[Function] The radial ribs extend in a direction almost perpendicular to the wrap of the orbiting scroll, so even if the end plate of the orbiting scroll is made thin, sufficient rigidity is ensured, and the weight of the orbiting scroll is reduced. By adjusting the seating surface area, the center of gravity of the orbiting scroll is positioned on the center line of the bearing boss.
As a result, the centrifugal force of the orbiting scroll can be reduced and vibrations can be reduced, making it possible to increase the rotation speed of the compressor.

In particular, in the structure of claim 2, since the passage is provided therein, even if the side surface of the outer peripheral part of the end plate of the orbiting scroll that is in orbital motion approaches the frame, the lubricating oil is not compressed there. , therefore.

The power consumption of one machine can be reduced.

・1 [Embodiment] FIG. 3 is a longitudinal cross-sectional view showing the overall structure of one embodiment of the scroll compressor of the present invention. An orbiting scroll 1 having a spiral wrap 1a meshes with a fixed scroll 2 having a spiral wrap 2a to form a compressor section. The fixed scroll 2 is combined with the frame 3 and fixed to the closed container 18. The outer periphery of the end plate of the orbiting scroll 1 is rotatably supported between the fixed scroll 2 and the frame 3 with a small gap, and the crankshaft 10 having a crank pin 10a bearing-fitted in a boss 6 provided on the lower surface thereof is hermetically sealed. The orbiting scroll 1 is rotated by the electric motor 11 supported by the container 18, so that the orbiting scroll 1 is rotated by the Oldham coupling mechanism 8.
While being prevented from rotating, it can be rotated relative to the fixed scroll 2. Due to this orbital movement, the waste taken in from the suction pipe 12 into the compression chamber formed between the wraps of both scrolls is compressed by the reduction in the volume of the compression chamber, and is discharged from the central discharge hole 2d of the fixed scroll. It is discharged into the lower discharge chamber 13, and then discharged outside the machine from the discharge pipe 15 via the lower motor chamber 14. During operation, a gas pressure intermediate between the suction pressure and the discharge pressure is introduced into the back pressure chamber 7 surrounded by the orbiting scroll 1 and the frame 3, and this intermediate pressure is applied to the back surface of the orbiting scroll 1. A force is generated to press the scroll 1 against the fixed scroll 2 in the axial direction.

This intermediate pressure is preferably introduced by introducing the gas that is being compressed between both scroll wraps into the back pressure chamber 7 through a small hole (not shown) passing through the end plate of the orbiting scroll 1. During operation, the crankshaft 1 supported on the frame 3 is connected to the oil reservoir 16 at the bottom of the closed container 18 through the oil supply pipe 17 and the oil supply hole 20 in the crankshaft 10.
Lubricating oil is supplied to the bearings of the boss portion 6 of the orbiting scroll 1, and this oil also lubricates the Oldham mechanism 8, and further supplies the oil from the back pressure chamber 7 between the outer periphery of the end plate of the orbiting scroll 1 and the frame 3. After lubricating the sliding parts of the orbiting scroll relative to the frame 3 and the fixed scroll 2 by entering the compression chamber between both scrolls through the orbiting cavity 4 of the
The oil is discharged into the discharge chamber 13 together with the gas, returns to the oil reservoir 1G via the motor chamber 14, and some of the oil is carried out of the machine through the discharge pipe 15 along with the gas.

Now, the details of the structure of the orbiting scroll 1 in this scroll compressor are shown in Fig. 1, and a partially enlarged view of the state in which it is combined with the fixed scroll 2 and the frame TS 3 is shown in Fig. 2.
As shown in the figure.

In FIG. 1, the end plate 1b of the orbiting scroll 1 is provided with radial ribs 1c connected to the bearing boss 6 on the opposite side from the wrap 1a, and the end plate 1b has a constant thin thickness between these ribs IC. , a recess 1d is formed between the lips 1c. Since the radial ribs 1c are substantially perpendicular to the wraps 1a, the orbiting scroll 1 has high rigidity even though the end plate 1b is made thinner, and the orbiting scroll 1 can be made lighter. Further, the tip of the radial rib IC is connected to a seat surface 5 that extends in the circumferential direction at the outer periphery of the mirror plate 1b.
It is connected to This seat surface 5 forms a contact seat surface with the fly 113, and by adjusting the area of this contact seat surface 5, the center of gravity of the orbiting scroll 1 is positioned on the center of the drive shaft (the center axis of the boss portion 6). let Furthermore, in order to prevent power loss due to agitation and compression of lubricating oil in the orbiting space 4 between the outer circumference of the orbiting scroll end plate and the frame 3, as shown in FIG. A notch 5a communicating with the space 4 outside the outer peripheral part of the end plate is provided between the seat surfaces 5, and thereby the end plate 1 of the orbiting scroll 1
The area of the seat surface 5 on the outer periphery of b is reduced, and the notch 5a and the recess 1d are used as lubricating oil passages that communicate the space 4 on the outside of the orbiting scroll head plate outer periphery with the back pressure chamber 7. Further, the height of the radial rib (which is equal to the height of the seat surface 5) is set so that it is sandwiched between the fixed scroll 2 and the frame 3 with a minute gap.

FIG. 4 shows an embodiment in which the contact seat surface 5 with the frame 3 is continuous over the entire circumference, and the orbiting scroll 1 is made even more rigid.

FIG. 5 shows an embodiment in which a hole 9 is formed in the seat surface 5 to serve as a passage for lubricating oil that communicates the space 4 on the outside of the outer circumference of the orbiting scroll end plate with the back pressure chamber 7 in the embodiment shown in FIG. Give an example.

The effects of these embodiments will be explained. When the compressor is operated at a high rotation speed, by making the end plate 1b thinner in parts other than the rib 1c and the seat surface 5 to reduce the weight of the orbiting scroll 1, the centrifugal force due to the own weight of the orbiting scroll 1 is reduced. It can be made smaller, which reduces the bearing load and improves the reliability of the compressor. Despite the thinning of the end plate as described above, the rigidity of the orbiting scroll does not decrease because the rib 1c is in the direction perpendicular to the wrap.

In addition, by adjusting the area of the contact seat surface 5 with the frame 3 to position the center of gravity of the orbiting scroll 1 over the center of the drive shaft (center line of the boss portion 6), unstable movement of the orbiting scroll 1 is prevented. This can prevent uneven contact of sliding parts and reduce vibration and noise. Furthermore, even when the end plate 1b of the orbiting scroll 1 is close to the fly 113 as shown in FIG. 2 and the space 4 is narrowed, in the embodiment shown in FIG. 1 or FIG. Since the lubricating oil can move through the recess 1d and the notch 5a or hole 9, an increase in power consumption due to agitation and compression of the lubricating oil can be prevented.

It should be noted that the scroll compressor of the present invention differs from a type of scroll compressor in which a frame supports an orbiting scroll that attempts to remove 1Ulf h from a fixed scroll with a thrust force of compressed gas pressure during operation. The orbiting scroll is of a type that pushes the orbiting scroll toward the fixed scroll side by applying the fluid pressure introduced into the back pressure chamber to the back surface of the orbiting scroll end plate, so there is no need to support the orbiting scroll with a frame during operation. The system only needs to be supported by the frame when starting or stopping when the gas pressure is low.
A small area such as the seat surface 5 or the rib 1c described above is sufficient for the contact portion of the orbiting scroll with the frame.

[Effects of the Invention] As is clear from the above description, the scroll compressor according to the present invention can reduce the weight of the orbiting scroll and align the center of gravity of the orbiting scroll with the center of the drive shaft. centrifugal force and vibration are reduced, enabling high-speed operation. Since the weight of the orbiting scroll is reduced by its structural shape, it is possible to make the orbiting scroll made of cast iron like the fixed scroll, and therefore the coefficient of thermal expansion of the material seen when the orbiting scroll is made of aluminum alloy Problems caused by differences can be avoided. In addition, especially when the configuration of claim 2 is adopted, stirring and
Power loss due to compression can be easily prevented.

[Brief explanation of drawings]

Figures 1 (a L (b) and (c) are a lap side plan view, a rear side plan view, and an A-0-A sectional view, respectively, of one embodiment of the orbiting scroll according to the present invention, and Figure 2 is a FIG. 3 is a partially enlarged sectional view of the orbiting scroll in combination with a fixed scroll and a frame; FIG. 3 is an overall sectional view of a scroll compressor according to an embodiment of the present invention; FIGS. 4(a), (b), (
c) is a lamp side plan view, a rear side bottom view, and an A-0-A sectional view of another embodiment of the orbiting scroll according to the present invention, and FIG. 5 is a further diagram of the orbiting scroll according to the present invention. FIG. 6 is a plan view of the rear side of another embodiment. 1. Orbiting scroll 2 Fixed scroll 3 Frame 4... Space 18 on the outside of the outer periphery of the end plate 18 Wrap 1b - End plate 1c Radial ribs 1d... Recess between the ribs 5 Contact seat surface 6... Bearing boss 7 - Back pressure Muro et al. 1 person Figure 4 (C) (a) A-0-A cross section (b) UII/70hi Z Scarce Figure 1

Claims (1)

[Claims] 1. An orbiting scroll and a fixed scroll each consisting of an end plate and a spiral wrap standing upright on the end plate, both scrolls are combined with each other with the wraps facing inward, and the orbiting scroll is fixed. A bearing boss provided on the back of the end plate of the orbiting scroll so as to rotate relative to the scroll receives the eccentric portion of the main shaft, and the outer periphery of the end plate of the orbiting scroll is held between the outer periphery of the fixed scroll end plate and the frame with a small gap. A fluid pressure is applied to a back pressure chamber formed on the back surface of the orbiting scroll to press the orbiting scroll against the fixed scroll, and as the closed working chambers formed by each of the wraps and end plates move toward the center. In a scroll compressor that compresses fluid by reducing its volume, a seat surface extending in the circumferential direction is provided on the back surface of the end plate of the orbiting scroll, and a seating surface that extends in the circumferential direction is provided on the outer periphery of the back surface of the end plate of the orbiting scroll, and A plurality of radial ribs extending radially to the outer periphery of the head plate are provided, the radial ribs are connected to the seat surface, and the depth of the recess between the radial ribs (therefore, the wall thickness of the head plate in the recess) is constant. A scroll compressor characterized in that the center of gravity of the orbiting scroll is located approximately on the center line of the bearing boss by adjusting the area of the seating surface. 2. The seat surface is provided with a notch or hole that communicates the outside of the seat surface with the recess between the radial ribs, and the recess between the ribs and the notch or hole are connected to the outer circumference of the end plate of the orbiting scroll and the back pressure chamber. 2. The scroll compressor according to claim 1, further comprising a passage communicating with the scroll compressor. 3. The scroll compressor according to claim 1, wherein the seat surface is continuous over the entire circumference of the end plate of the orbiting scroll.