JPH07229480A - Double rotary scroll compressor - Google Patents

Abstract

PURPOSE:To promote the miniaturization of a compressor as well as to reduce vibration and noise in addition to being well balanced in load being added to a bearing. CONSTITUTION:A motor-operated element 2 and a scroll compressive element 3 are stored in a hermetrically sealed vessel 1, and this scroll compressive element 3 consists of a driving scroll 13 clamped to a rotor 5 of the motor- operated element 2, a driven scroll 22 eccentrically set to this driving scroll 13, and an Oldham's coupling 23 rocking this driven scroll 22 so as to be followed to the driving scroll 13, and it is so constituted as to be housed and set up in an inner part of the rotor 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double scroll scroll compressor which rotates both scrolls in the same direction to perform compression.

[0002]

2. Description of the Related Art A conventional scroll compressor is constructed, for example, as disclosed in Japanese Patent Publication No. 1-35196.

That is, an electric element and a scroll compression element are housed above and below in a closed container, and the scroll compression element is provided with a drive shaft connected to the electric element by erected a spiral wrap on the end plate. 1 scroll and this 1st
Has a driven shaft that is eccentric with the center of the scroll driving shaft,
A second scroll in which a spiral wrap is erected on an end plate that faces and meshes with the first scroll; a main frame having a main bearing that supports the drive shaft of the first scroll; An auxiliary frame having an auxiliary bearing for supporting the driven shaft of the scroll, and a plurality of first and second scrolls housed in a hollow chamber formed inside the auxiliary frame and the main frame. An Oldham coupling that oscillates these scrolls while rotating them in the same direction so that the compression space is gradually contracted from the outside to the inside, and one of the two scrolls is fixed to the other. And a restriction member that restricts the movement of the scroll in the axial direction.

Then, by the Oldham coupling, the first
The second scroll is driven in the same direction as the second scroll is driven, and the second scroll is drive-coupled so as not to rotate with respect to the first scroll.

In the scroll compressor having this structure,
By rotating the second scroll in the same direction and compressing the refrigerant in the compression space, vibrations of the first and second scrolls during compression operation are reduced, and the scroll compressor can be used for high speed.

[0006]

However, in the scroll compressor having the conventional structure as described above, since the scroll compression element is arranged in the lower portion (or upper portion) of the electric element, the height dimension of the compressor is high. There was a problem that the compressor was not compact. Further, due to the above arrangement, the load of the compressed gas acts on the outside of the main bearing and the auxiliary bearing, so that the loads applied to both bearings are considerably different, and the balance of the compressor is unbalanced, which causes vibration and noise. There was a problem.

The present invention solves the above problems.
An object of the present invention is to provide a high-performance double-rotating scroll compressor that promotes downsizing of a compressor, balances loads applied to bearings, and reduces vibration and noise.

[0008]

According to the present invention, an electric element and a scroll compression element are housed in a closed container, the scroll compression element is a drive scroll fixed to a rotor of the electric element, and the drive scroll. A driven scroll that is eccentrically set with respect to the driven scroll and an Oldham coupling that swings the driven scroll so as to follow the drive scroll are housed and arranged inside the rotor.

[0009]

The present invention is constructed as described above,
A scroll compression element such as a drive scroll, a follower scroll, an Oldham's joint, etc. can be housed inside the rotor, and the height dimension of the compressor can be reduced by the height dimension of the scroll compression element, thus facilitating downsizing of the compressor. Moreover, since the distance between the bearings of both scrolls can be shortened, the load of the compressed gas applied to each bearing can be dispersed in a well-balanced manner.
It is possible to provide a high-performance compressor that reduces vibration and noise.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. Figure 1
FIG. 1 is a vertical sectional view of a double-rotating scroll compressor showing an embodiment of the present invention. Reference numeral 1 denotes a closed container in which an electric element 2 and a scroll compression element 3 are housed. The electric element 2 is composed of a stator 4 and a rotor 5 arranged inside the stator. Stator 4 and rotor 5
An air gap 6 is formed between and. Rotor 5
The (rotor) is manufactured by laminating electromagnetic steel plates to a predetermined thickness and then casting the same by aluminum die casting to integrally form an auxiliary bearing 12 described later. A ball bearing 32 is attached to the auxiliary bearing 12.

Reference numeral 7 is a main bearing formed in the center of the closed container 1. Reference numeral 8 is a support shaft also formed in the closed container 1, and an eccentric portion 10 is connected to the support shaft 7 via a thrust plate 9 by a bolt 10. Reference numeral 12 is an auxiliary bearing formed in the lower portion of the rotor 5, and the auxiliary bearing is axially supported by the support shaft 8.

The scroll compression element 3 is housed in the rotor 5 of the electric element 2, is axially supported by the main bearing 7 via a shaft seal member 33, a thrust plate 14, and a ball bearing 15, and is sucked into the inside. A drive shaft 17 having a gas hole 16, a drive scroll 13 integrally formed with the drive shaft, having a suction gas passage 18 and a discharge gas passage 19 therein, and fixed to the rotor 5 by a bolt 26;
The boss portion 21 is fitted into the eccentric portion 11 of the support shaft 8 via the needle bearing 20, and the drive scroll 1
The driven scroll 22 is rotated in the same direction as 3, and the Oldham coupling 23 that connects the driven scroll 22 and the lower portion of the rotor 5 to each other. Reference numeral 24 is a gas inlet. A discharge valve 25 opens and closes the discharge gas passage 19.

The drive scroll 13 is a disk-shaped end plate 27.
And a spiral wrap 28 formed of an involute curve which is erected on one surface of this end plate, and the driven scroll 22 is erected on one surface of this end plate and a disk-shaped end plate 29. And a spiral wrap 30 formed of an involute curve.

The scrolls 13 and 22 rotate in the closed container 1 in the same direction. Drive scroll 13
Is rotatably supported by the drive shaft 17 at the main bearing 7, and the driven scroll 22 is rotatably supported at the eccentric portion 11 of the support shaft 8 so that the wraps 28 and 30 of both scrolls 13 and 22 face each other and engage with each other. So that a plurality of compression spaces 31 are formed inside.

The Oldham coupling 23 is a driving scroll 1.
While the 3 and the driven scroll 22 are rotated in the same direction, the driven scroll swings relative to the drive scroll 22.

In the double-rotary scroll compressor thus constructed, the refrigerant gas introduced through the suction port 24 is introduced into the compression space 31 through the suction gas hole 16 and the suction gas passage 18 of the drive scroll 13. , Is compressed by both scrolls 13 and 22, and is once discharged into the closed container 1 through the discharge hole 19 and then discharged from the discharge pipe (not shown) to the outside of the closed container 1.

The scroll compression element 3 is housed in the rotor 5 of the electric element 2 so as to drive the scroll 13.
Since the structure rotates with the driven scroll 22 and the Oldham coupling 23, the electric element 2 and the scroll compression element 3
And can have the same height, and the scroll compression element 3
The height dimension of the compressor can be reduced by the height dimension, and the miniaturization of the compressor can be promoted. Moreover, both scrolls 13 and 2
Since the distance between the two bearings 7 and 12 can also be shortened, the load of the compressed gas can be dispersed in a well-balanced manner (the point of action of the load of the compressed gas applied to each bearing 7, 12 is both bearings 7,
Since it occurs in the middle of 12), it is possible to provide a high-performance compressor with reduced vibration and noise.

[0018]

As described above, according to the present invention, a scroll compression element such as a drive scroll, a driven scroll, an Oldham's joint or the like can be housed in the rotor, and the height dimension of the compressor is equal to the height dimension of the scroll compression element. Can be reduced and miniaturization of the compressor can be promoted. Moreover, since the distance between the bearings of both scrolls can be shortened, the load of the compressed gas applied to each bearing can be dispersed in a well-balanced manner, and vibration and noise can be reduced to provide a high-performance compressor.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a double-rotating scroll compressor showing an embodiment of the present invention.

[Explanation of symbols]

 1 Airtight Container 2 Electric Element 3 Scroll Compression Element 5 Rotor (Rotor) 7 Main Bearing 12 Auxiliary Bearing 13 Drive Scroll 16 Discharge Gas Hole 17 Drive Shaft 18 Discharge Gas Passage 22 Driven Scroll 23 Oldham Coupling

Claims (1)

[Claims] 1. An electric element and a scroll compression element are housed in a hermetic container, and the scroll compression element is set eccentrically to the drive scroll fixed to the rotor of the electric element. A double-rotating scroll compressor, comprising a driven scroll and an Oldham coupling that swings the driven scroll so as to follow the drive scroll, and is housed inside the rotor.