JPH07208351A - Scroll compressor - Google Patents

Abstract

PURPOSE:To increase speed of a compressor by providing an Oldham's joint in which a plurality of compression spaces are gradually decreased from outside to inside for compression while scrolls are rotated in the same directions for oscillations, and by reducing frictional resistance of a shaft of the scroll on the driving side for increasing peripheral speed. CONSTITUTION:When an electrically driven element 2 is rotated, its torque is transmitted to a first scroll 13. This torque is then transmitted to a second scroll 14 through an Oldham's joint 29. The second scroll 14 is relatively oscillated while being rotated in the same direction as the first scroll 13. A first shaft 17 on a driving side is fitted on an outside of a second shaft 24 for rotation. It is thus possible to form a large diameter of the first shaft which is driven by the electrically driven element 2. Frictional resistance of the first shaft is reduced to improve peripheral speed, and high speed operation of a compressor is promoted. It is possible not only to simplify a structure but also to reduce a size of the compressor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor for rotating both scrolls in the same direction for 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 in a closed container, and the scroll compression element is provided with a first scroll having a shaft connected to the electric element by erecting a spiral wrap on an end plate, and A second scroll having an axis eccentric to the center of the axis of the first scroll, and a spiral wrap provided upright on an end plate which faces and meshes with the first scroll; A main frame having a main bearing supporting the shaft, and an auxiliary frame having an auxiliary bearing supporting the shaft of the second scroll,
The plurality of compression spaces formed by the first scroll and the second scroll housed in the hollow chamber formed inside by the auxiliary frame and the main frame are gradually compressed from the outside to the inside to perform compression. It is composed of an Oldham coupling that oscillates these scrolls while rotating them in the same direction, and a restricting member that is fixed to one of the scrolls and restricts the movement of the other scroll in the axial direction. ing.

[0003] And, 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.

[0005]

However, the scroll compressor of the conventional structure as described above is rotatably supported by the respective shafts which are eccentrically set to each other in each of the first and second scrolls. Moreover, the first drive side
The scroll shaft has a structure that is directly fitted to the rotor of the electric motor, so the diameter of the shaft cannot be increased so much structurally, and the frictional resistance of the bearing that supports the shaft increases. However, when used in a compressor that operates at high speed with an inverter or the like, there is a problem that wear increases due to an increase in peripheral speed and the product cannot be used.

Further, since the above-described structure seals the space between the main frame and the auxiliary frame to form a hollow chamber for housing both scrolls, there is a problem that the number of parts increases and the structure becomes complicated. there were.

The present invention solves the above problems.
The frictional resistance of the shaft of the first scroll, which is the driving side, is reduced to further increase the peripheral speed, which accelerates the speed of the compressor and simplifies the structure of the bi-rotary compression mechanism to reduce the cost. It aims at providing a simple scroll compressor.

[0008]

According to the present invention, an electric element and a scroll compression element are housed in a closed container, and the scroll compression element includes a first shaft connected to the electric element and the first shaft. A first scroll which is connected to the shaft and rotates together with the shaft and in which a spiral wrap is erected on the end plate; and a first scroll which is inserted into the first shaft and has an eccentric portion which is eccentric to the center of the first shaft. A second shaft, a boss portion of which is fitted to an eccentric portion of the second shaft, and a second scroll in which a spiral wrap is erected on an end plate which faces and meshes with the first scroll; A main frame having a main bearing that supports the first shaft, an auxiliary frame that also has an auxiliary bearing that supports the first shaft, and a plurality of the plurality of scrolls formed by the first scroll and the second scroll. From the outside to the inside of the compression space While rotating the both scrolls in the same direction so as to perform compression by reducing the which is constituted by the Oldham coupling to swing.

[0009]

The present invention is constructed as described above,
The diameter of the first shaft driven by the electric element can be increased, the frictional resistance of the first shaft can be reduced, the peripheral speed can be improved, and the speed of the compressor can be increased. Moreover, since the second shaft of the second scroll, which is the driven side, has a structure that is inserted into the first shaft, not only the structure is simplified, but also the compressor can be miniaturized.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. Figure 1
1 is a vertical sectional view of a scroll compressor showing an embodiment of the present invention. Reference numeral 1 denotes a closed container in which an electric element 2 is housed on the upper side and a scroll compression element 3 is housed on the lower side. The electric element 2 is composed of a stator 4 and a rotor 5 arranged inside the stator. An air gap 6 is formed between the stator 4 and the rotor 5.

A main frame 7 is provided with a main bearing 8 in the center thereof. Reference numeral 9 denotes an auxiliary frame that is attached by pressure contact with the inner wall of the closed container 1. An auxiliary bearing 10 is provided on the opposite side of the main frame 7 with the electric element 2 sandwiched between the auxiliary frame 10 and the upper surface thereof. A disk 12 is fixed by a bolt 11.

The scroll compression element 3 includes a first scroll 13 integrally formed with a first shaft 17 driven by the electric element 2, and a second scroll 14 for rotating in the same direction as the first scroll 13. It is configured. First
The scroll 13 has a disk-shaped end plate 15, a spiral wrap 16 formed on one surface of the end plate and formed of an involute curve, and a flange portion 18 of the end plate 15.
Are connected by bolts 19, and the main bearing 8 and the auxiliary bearing 1 are connected.
The first shaft 17 is supported by the rotor 0 and is inserted and fixed to the rotor 5 to serve as the drive side.

The scrolls 13 and 14 are a space 2 formed by the main frame 7 and the bottom wall of the closed container 1.
Rotate in 0. As a result, the first scroll 13 constitutes a drive side scroll.

On the other hand, the second scroll 14 has a disk-shaped end plate 21, a spiral wrap 22 formed on one surface of the end plate and formed of an involute curve, and the end plate 2.
1 and the boss portion 23 projecting to the center of the other surface. The second scroll 14 constitutes a driven scroll.

An eccentric portion 24 is inserted in the first shaft 17 and is eccentric with the center of the first shaft 17 by an eccentric amount e.
5 is a second axis having 5. The upper end of the second shaft 24 is fixed to the disc 12, and the boss portion 23 of the second scroll 14 is fitted and supported in the eccentric portion 25 at the lower end thereof.

The first scroll 13 has a first shaft 17 serving as a drive shaft supported by the main bearing 8 and the auxiliary bearing 10 of the main frame 7, and the second scroll 14 has the boss portion 23 of the second scroll 14 for supporting the second scroll 14. A driven shaft is supported by an eccentric portion 25 of the shaft 24, and the wraps 16 and 22 of the scrolls 13 and 14 are engaged with each other in the space 20 so as to face each other to form a plurality of compression spaces 26 inside. .

That is, the second shaft 24 and the eccentric portion 25 and the bearing 8 of the main frame 7 are fixed and do not rotate. Second
The shaft 24 has a discharge hole 2 for discharging the refrigerant compressed in the compression space 26 to the upper space 27 of the electric element 2 in the closed container 1.
8 are provided. Flange portion 1 of the first shaft 17
Reference numeral 8 restricts the movement of the second scroll 14 in the axial direction, and is arranged in contact with the end plate 21 of the second scroll 14.

Reference numeral 29 denotes an Oldham joint provided between the flange portion 18 and the second scroll 14, and the Oldham joint is the first scroll 13 and the second scroll 1.
This second scroll is made to oscillate relatively to the first scroll 13 while rotating 4 and 4 in the same direction.

Reference numeral 30 is a suction pipe which is connected to penetrate the closed container 1 and communicates with the space 20 maintained at a low pressure. The main bearing 8 of the main frame 7 and the first shaft 17 are provided with oil supply holes 31 for lubricating the sliding surfaces of the shaft 17 and the second scroll 14. Reference numeral 32 denotes a discharge pipe, which is provided above the closed container 1.

In the scroll compressor having such a structure, when the electric element 2 is rotated, the rotational force of the electric element 2 becomes first.
It is transmitted to the first scroll 13 via the shaft 17 of.
The rotational force transmitted to the first scroll is transmitted to the second scroll 14 via the Oldham coupling 29, and the second scroll 14 rotates relatively in the same direction as the first scroll 13. Is moving. The second scroll 14 rotates at a position eccentric with the eccentric portion 25 of the second shaft 24 with respect to the center of the first shaft 17 serving as the drive shaft of the first scroll 13. for that reason,
The first scroll 13 and the second scroll 14 gradually reduce the compression space 26 formed by these scrolls from the outside to the inside, and guide the refrigerant flowing from the suction pipe 30 to the space 20 to the outside. It is made to flow into the compression space 26 of one side and compressed. The compressed refrigerant is discharged through the holes 33 of the first scroll 13 and the discharge holes 2 provided in the second shaft 24.
It is discharged into the upper space 27 via 8 and is discharged from the discharge pipe 32 to the outside of the closed container 1.

The first shaft 17 on the drive side is the second
Since it is fitted and rotated on the outside of the shaft 24 of the
It is possible to form a large diameter of the first shaft 17 driven by the above, and it is possible to reduce the frictional resistance of the first shaft 17 and improve the peripheral speed, thereby promoting the speeding up of the compressor. Moreover, the second side of the second scroll 14 on the driven side
Since the shaft 24 has a structure that is inserted into the first shaft 17, not only the structure is simplified, but also the compressor can be miniaturized.

[0022]

As described above, according to the present invention, the diameter of the first shaft driven by the electric element can be increased, and the friction resistance of the first shaft can be reduced to reduce the circumferential speed. It is possible to improve the speed of the compressor. Moreover, the second axis of the second scroll, which is the driven side, is
Since the structure is inserted in the shaft of, the structure is not only simple, but also contributes to downsizing of the compressor.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view of essential parts showing first and second shafts of the present invention.

[Explanation of symbols]

 1 Airtight Container 2 Electric Element 3 Scroll Compression Element 7 Main Frame 8 Main Bearing 9 Auxiliary Frame 10 Auxiliary Bearing 13 First Scroll 14 Second Scroll 15,21 End Plate 16,22 Wrap 17 First Axis 24 Second Axis 25 Eccentric part 29 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 connected to the first shaft and a first shaft connected to the first shaft. A first scroll that rotates and has a spiral wrap standing on the end plate; a second shaft that is inserted into the first shaft and that has an eccentric portion that is eccentric to the center of the first shaft; The boss portion is fitted to the eccentric portion of the shaft of the
A second scroll in which a spiral wrap is erected on an end plate that is opposed to and meshes with the scroll of FIG.
A main frame having a main bearing that axially supports the shaft, an auxiliary frame having an auxiliary bearing that also axially supports the first shaft, and a plurality of compression spaces formed by the first scroll and the second scroll. A scroll compressor comprising an Oldham coupling that oscillates while rotating both scrolls in the same direction so as to gradually reduce the pressure from the outside to the inside and perform compression.