JP2003269101A - Scroll fluid machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scroll fluid machine preventive of radial overload on a pin crank type self-rotation preventing mechanism provided across fixed scrolls and a rotary scroll when a difference in diameter occurs therebetween with temperature rise accompanying operation. <P>SOLUTION: When a difference in diameter occurs between each of the fixed scrolls 3c, 4c and the rotary scroll 5, a main shaft 11a or a crank shaft 11b of a pin crank 11 is displaced to the radial direction, thus preventing overload. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a scroll fluid machine such as a scroll compressor, a scroll vacuum pump, a scroll expander and a scroll blower.

[0002]

2. Description of the Related Art A scroll fluid machine comprising a fixed scroll, an orbiting scroll, a drive shaft with a crankshaft, a crankpin type anti-rotation mechanism, and a casing is disclosed in Japanese Patent Laid-Open No. Sho 61-61.
It is described in a large number of publications such as Japanese Patent Publication No. 175201, and is well known.

In FIG. 1, the orbiting scroll is orbited in the housing so that the gas sucked from the outer peripheral portion of the housing is sucked into the compression chamber formed by the combination of the orbiting scroll and the fixed scroll, and goes toward the center thereof. FIG. 3 is a vertical cross-sectional view showing a scroll gas compressor having a typical configuration, which is configured to be discharged after being compressed according to the above. However, the present invention can be applied to various scroll fluid machines for depressurization, blowing, and the like.

In FIG. 1, (1) is a housing provided with a closed disk-shaped compression chamber (2), which is a housing (3) and a lid.
It consists of (4).

The housing (3) and the lid (4) respectively have fixed end plates (3a) (4a) located on opposite sides of the compression chamber (2), and these compression chambers (2) Fixed scroll wraps (3b) and (4b) are erected on the surfaces facing the sides to form fixed scrolls (3c) and (4c).

A compression chamber is provided between the fixed end plates (3a) and (4a).
In (2), an orbiting scroll (5) is provided so as to be able to orbit around the axis of the compression chamber (2).

The orbiting scroll (5) comprises orbiting wraps (5b) and (5b) which stand on both sides of the orbiting end plate (5a) and engage with and engage with the fixed scroll (3c) by 180 °. The eccentric shaft portion (8a) of the drive shaft (8) fitted in the central portion of (1) via bearings (6) and (7) is pivotally supported via bearings (9).

The swivel end plate (5a) is linked to the fixed end plate (3a) through three known pin-crank type rotation preventing mechanisms (10) arranged on the same circumference at equal intervals. When the drive shaft (8) rotates, the swiveling end plate (5a) makes an eccentric revolution movement in the compression chamber (2), and the fixed wraps (4b) mesh with each other.
The radial dimension of the space between the swirl wrap (5b) is changed.

The pin crank type anti-rotation mechanism (1
0) is the pin crank (11) as shown in FIGS.
The main shaft (11a) of the fixed end plate through the ball bearing (12)
The crankshaft (11b) is also pivotally supported by an appropriate hard bearing (14) fitted in a support hole (13) formed near the outer circumference of the turning end plate (5a). It is a thing.

As a result, the gas is sucked and compressed from the suction hole (1a) provided in the outer peripheral portion of the housing (1),
Discharge passage from the discharge hole (1b) derived from near the center of (1)
It is designed to discharge through (3e).

The above-described configuration itself is well known to those skilled in the art and is not directly related to the present invention. Therefore, further explanation is not necessary.

[0012]

In the scroll fluid machine described above, the fixed end plates (3a) (4a) are rotated end plates (5).
Of the cooling fins (3d) (4d) or the drive shaft on the outer surface of the fixed end plate (3a) (4a).
Since the cooling fans (15) and (16) driven by (8) are provided, the fixed scrolls (3c) and (4c) are cooled very well.

However, the orbiting scroll located inside
Since (5) is not sufficiently cooled and becomes hotter than the fixed scrolls (3c) (4c), the swivel end plate (5a) is fixed to the fixed end plates (3a) (4a).
It expands more than

Therefore, the center of the rigid bearing (13) for pivot support of the crankshaft (11b) in the pin crank (11) provided on the outer peripheral portion of the turning end plate (5a) is located at the main shaft (11a) of the pin crank (11). ) And the crankshaft (11b) with more eccentricity than the fixed end plate (3
The bearing (12) for pivoting the main shaft (11a) in (a) is displaced from the center to the outer peripheral direction.

However, in the above-mentioned conventional scroll fluid machine, the main shaft (11a) and the crank shaft (11b) of the pin crank (11) are radially attached to the fixed end plate (3a) and the orbiting end plate (5a), respectively. Since it cannot be displaced, the crankshaft (11b) of the pin crank (11) causes the crankshaft (11b) of the swivel end plate (5a) to be a rigid bearing for pivot support.
Abnormal load is applied to (13), resistance increases, drive efficiency decreases, and vibration, wear, and noise increase.

[0016]

The present invention has been made for the purpose of solving the above problems, and its concrete means are as follows. (1) In the scroll fluid machine, when the diameters of the fixed scroll and the orbiting scroll differ due to the operation,
By making the main shaft of the pin crank or the crank shaft of the rotation prevention mechanism spanning between the end plates of the both end plates, or both axis lines thereof, displaceable in the radial direction of the scroll fluid machine, the main shaft of the pin crank. And the crankshaft so that it can be rotated comfortably while maintaining the original amount of eccentricity.

(2) In the scroll fluid machine in which the main shaft of the pin crank in the rotation preventing mechanism is pivotally supported by the end plate of the fixed scroll, and the crank shaft of the pin crank is also pivotally supported by the end plate of the orbiting scroll. When the axis of the crankshaft pivot portion of the end plate is deviated to the center of the scroll fluid machine in the radial direction during non-operation, and the end plate of the orbiting scroll thermally expands in the radial direction due to the temperature rise accompanying the operation. The deviation amount between the crankshaft pivotal support portion of the turning side end plate and the crankshaft of the pin crank is set to be small.

(3) In the above (1) or (2), either one or both of the bearing that pivotally supports the main shaft of the pin crank and the bearing that pivotally supports the crank shaft is fixed to the end plate of the fixed scroll or the orbit. It is pivotally supported in a support hole of a scroll end plate through a retaining ring that is elastically deformable in the radial direction of the scroll machine.

(4) In any one of the above items (1) to (3), one or both of the bearing that pivotally supports the main shaft of the pin crank and the bearing that pivotally supports the crank shaft of the fixed scroll A bearing that is elastically deformable in the radial direction of the scroll machine is pivotally supported in a support hole in the end plate or the end plate of the orbiting scroll.

(5) In any one of the above items (1) to (4), one or both of the main shaft of the pin crank and the crank shaft are made of a material that is deformable in the radial direction of the scroll fluid machine.

(6) In any one of the above items (1) to (4), one or both of the main shaft and the crank shaft of the pin crank is covered with a material that is deformable in the radial direction of the scroll fluid machine.

[0022]

4 and 5 show an essential part of an embodiment of the present invention. In a scroll fluid machine having the same structure as shown in FIGS. 1 to 3, a swirling end plate ( 5a)
The support hole (13) for pivoting the crankshaft (11b) in is made slightly larger in diameter than the outer diameter of the hard bearing (14) fitted therein, and within the gap formed between the two. A proper number of retaining rings (17) (17) that are elastically deformable in the radial direction are interposed.

The outer circumference of each retaining ring (17) is fitted in an annular groove (18) formed in the inner surface of the support hole (13) so that it cannot move laterally.

Therefore, as described above, the diameter of the swiveling end plate (5a) is expanded during operation, and the center of the hard bearing (14) is pivotally supported by the fixed end plate (3a). Pink rank (1
When the center of the crankshaft (11b) in (1) is displaced in the outer peripheral direction, the deviation is absorbed by the deformation of the retaining ring (17), and the axis of the hard bearing (14) is pincrank ( 11)
Of the crankshaft (11b) is prevented.

Therefore, the swivel end plate (5a) due to heat generated during operation
Irrespective of the radial deformation of the pin crank (11), the crankshaft (11b) of the pin crank (11) is not displaced with respect to the hard bearing (14) fitted into the support hole (13) of the swivel end plate (5a). Without this, smooth and light driving is performed.

The basic idea of the present invention is, in a scroll fluid machine, in a rotation preventing mechanism which is provided over a fixed end plate and a turning end plate when a difference in diameter occurs between the fixed end plate and the orbiting end plate due to a temperature rise due to operation. By making the pink rank main shaft and / or crank shaft axially displaceable, the main shaft and crank shaft of the pin crank can be smoothly rotated while maintaining the original amount of eccentricity. Therefore, a person skilled in the art can easily conceive the following modified embodiment other than the above-described embodiment.

(1) In the embodiment shown in FIGS. 4 and 5, as shown in FIG. 6, the crankshaft (11b) of the swing end plate (5a) with respect to the axis of the crankshaft (11b) of the pin crank (11). The axis of the pivot bearing (14) is slightly displaced toward the radial center of the scroll fluid machine at room temperature, and the crankshaft (11b) pivots on the orbiting end plate (5a) as the temperature rises during operation. The amount of deviation between the support bearing (14) and the crankshaft of the pin crank should be small.

(2) The bearing itself, which pivotally supports one or both of the pink rank main shaft and the crank shaft, is made of a material elastically deformable in the radial direction of the scroll fluid machine.

(3) One or both of the pink rank main shaft and the crank shaft are made of a material elastically deformable in the radial direction of the scroll fluid machine, or are covered with such a material.

[0030]

The invention according to claim 1 is as follows: -During operation, even when the diameter of the orbiting scroll becomes larger than the diameter of the fixed scroll, the main shaft of the pin crank or the pivotal support portion of the crank shaft in the rotation preventing mechanism. Moreover, an excessive lateral force directed in the radial direction of the scroll fluid machine does not act.

According to a second aspect of the present invention: -During operation, as the diameter of the orbiting scroll becomes larger than the diameter of the fixed scroll, the amount of deviation between the main shaft of the pin crank and the pivotal support of the crank shaft becomes smaller, Resistance decreases.

According to a third aspect of the present invention: -During operation, when the diameter of the orbiting scroll becomes larger than the diameter of the fixed scroll, the crankshaft or the main shaft of the pin crank causes the holding ring to scroll fluid through the bearing. Pushing in the radial direction of the machine prevents excessive force from acting on the crankshaft of the pin crank.

According to a fourth aspect of the present invention: -During operation, when the diameter of the orbiting scroll becomes larger than the diameter of the fixed scroll, the crankshaft or main shaft of the pin crank presses the bearing in the radial direction, Excessive force is prevented from acting on the pink rank crankshaft.

According to a fifth aspect of the present invention: -During operation, when the diameter of the orbiting scroll becomes larger than the diameter of the fixed scroll, the main shaft of the pin crank or the crank shaft is deformed in the radial direction, thereby causing the pin crank. Excessive force is prevented from acting on the crankshaft of.

The invention according to claim 6 is as follows: -During operation, when the diameter of the orbiting scroll becomes larger than the diameter of the fixed scroll, the main shaft of the pin crank or the coating of the crank shaft is deformed in the radial direction, Excessive force is prevented from acting on the pink rank crankshaft.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing a typical example of a conventional scroll fluid machine.

FIG. 2 is an enlarged view showing the pin crank type anti-rotation mechanism in FIG. 1 in an exploded manner.

FIG. 3 is a view showing a state in which a swivel end plate is radially expanded in the structure shown in FIG.

FIG. 4 is a view similar to FIG. 2, showing an embodiment of the present invention.

FIG. 5 is a view similar to FIG.

FIG. 6 is a view similar to FIG. 2 showing an embodiment of the invention as set forth in claim 2;

[Explanation of symbols]

(1) Housing (1a) Suction hole (1b) Discharge hole (2) Compression chamber (3) Case (3a) Fixed end plate (3b) Fixed wrap (3c) Fixed scroll (3d) Cooling fin (4) Lid (4a) Fixed end plate (4b) Fixed wrap (4c) Fixed scroll (4d) cooling fins (5) Orbiting scroll (5a) Swiveling end plate (5b) Swing lap (6) (7) Bearing (8) Drive shaft (8a) Eccentric shaft (9) Bearing (10) Pin crank type rotation prevention mechanism (11) Pin crank (11a) Spindle (11b) Crankshaft (12) Ball bearing (13) Support hole (14) Bearing (15) (16) Cooling fin (17) Retaining ring (18) Ring groove

Claims (6)

[Claims] 1. In a scroll fluid machine, when there is a difference in diameter between a fixed scroll and an orbiting scroll due to operation, a main shaft of a pin crank or a crank in a rotation preventive mechanism spanned between the end plates of both scrolls. By making the shaft axis, or both axis lines, displaceable in the radial direction of the scroll fluid machine, it is possible to rotate the pin crank main shaft and the crank shaft comfortably while maintaining the original amount of eccentricity. A scroll fluid machine characterized by the above. 2. A scroll fluid machine in which a main shaft of a pin crank in a rotation preventing mechanism is pivotally supported by an end plate of a fixed scroll, and a crank shaft of the same pin crank is pivotally supported by an end plate of an orbiting scroll. In the non-operation, the axis line of the crank shaft pivotal support portion in is displaced in the radial center direction of the scroll fluid machine, and when the end plate of the orbiting scroll thermally expands in the radial direction due to the temperature rise accompanying the operation, A scroll fluid machine characterized in that the amount of deviation between the crankshaft pivotal support portion of the orbiting side end plate and the crankshaft of the pin crank is small. 3. A bearing for pivotally supporting a pink rank main shaft and / or a bearing for pivotally supporting a crankshaft thereof are provided in a support hole of a fixed scroll end plate or an orbiting scroll end plate of a scroll machine. The scroll fluid machine according to claim 1 or 2, wherein the scroll fluid machine is pivotally supported via a retaining ring which is elastically deformable in a radial direction. 4. A bearing for pivotally supporting a pink rank main shaft and / or a bearing for pivotally supporting a crankshaft thereof are provided in a supporting hole of a fixed scroll end plate or an orbiting scroll end plate of a scroll machine. The scroll fluid machine according to any one of claims 1 to 3, further comprising a bearing that is elastically deformable in a radial direction. 5. The pink rank main shaft and / or the crank shaft are made of a material that is deformable in the radial direction of the scroll fluid machine.
The scroll fluid machine according to any one of to 4. 6. The one or both of the pink rank main shaft and the crank shaft are coated with a material that is deformable in the radial direction of the scroll fluid machine.
4. The scroll fluid machine according to any one of 4 above.