JPH0466791A - Scroll compressor - Google Patents

Abstract

PURPOSE:To eliminate the necessity of forming a play for both scrolls in a space so as to miniaturize a scroll compressor by fixing to respective portions of a cylindrical member either one of first and second scrolls and a regulating member for regulating the axial displacement of the other scroll. CONSTITUTION:A scroll compression element 3 stored in a sealed container 1 consists of a first scroll 14 which is driven by a motor-driven element 2 and a second scroll 15 which is rotated in the same direction as the scroll 14. A plurality of compression spaces 22 are formed between the laps 17, 20 of each scroll 14, 15. In this case, a regulating member 23 for regulating the axial displacement of the second scroll 15 is provided and is in the shape of a flat ring and mounted to a cylindrical member 25 fixed to the outer periphery of the end plate 16 of the first scroll 14 by a whirl-stop member 24. A transmission joint 33 is provided which comprises a ring 35 to be fitted with a slide face 34 provided on the outer periphery of the driven shaft 21 of the second scroll 15 and a key 37 to be fitted into a key channel 36 provided in the regulating member 23.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application This invention relates to a scroll compressor that performs compression by rotating both scrolls in the same direction.

(b) Prior art A conventional scroll compressor is disclosed in Japanese Patent Publication No. 1-35199, for example.
The structure is as shown in the publication. here,
A conventional example will be explained with reference to this publication. In Figure 6,
In the conventional example shown in this figure, the housing 50
, a discharge chamber 51, a first scroll 52 which is a driving scroll and a second scroll 53 which is a driven scroll housed inside the housing 50, a rotating shaft 54 which is a driving shaft integral with the first scroll 52, and a second scroll 53 which is a driven scroll. a rotating shaft 55 which is a driven shaft integral with the second scroll 53; an electric motor 56 which is a drive source for the first and second scrolls 52 and 53;
The end plate 58 of the first scroll 52 is moved by the sliding ring 57.
and an inner wall 60 of the first housing member 59 facing thereto.
A sealed space 61 is formed in between, and a sealed space 66 is formed between the end plate 63 of the second scroll 53 and the inner wall 65 of the second housing 64 opposite thereto by the sliding ring 62.
, and a lubrication system path.

As shown in FIG. 6, the housing 50 is constructed by combining first and second housing members 59 and 64. A gas suction port 67 is formed in the side of the second housing 64, and an oil supply hole 69 is formed in the end of the cylindrical portion 68.
An end cover 70 having a diameter is attached.

The discharge chamber 51 is connected to a first housing member 59, as shown in FIG. An end cover 73 is attached to the portion.

The first scroll 52 has an end plate 58 and a wrap 74. On the other hand, the second scroll 53 has an end plate 63, a wrap 75, a peripheral edge part 76 provided on the end plate 63, and a peripheral edge part 7 that is opposite to the outer edge of the end plate 58 of the first scroll 52.
6 and a flange 77 provided thereon. The second scroll 53 is provided with a compression space 78 inside a peripheral portion 76, and a gas suction lower 9 is provided in the peripheral portion 76. The wraps 74, 75 are spirally formed with involute or similar curves and are interlocked. A compressed space 7 is provided on the end plate 58°63.
Gas holes 80.81 are provided for introducing gas pressure into the sealed space 61.66 from 8. Furthermore, an Oldham ring 82 is incorporated between the end plate 58 of the first scroll 52 and the flange 77 of the second scroll 53, and the
As the scroll 52 is driven, the second scroll 53 is driven in the same direction, and when stopped, the second scroll 53 is disconnected from the first scroll 52 so that it does not rotate.

The rotation shaft 54 of the first scroll 52 and the rotation shaft 55 of the second scroll 53 have a center of 0. ．． 0. are mutually spaced ε,
It is mounted eccentrically. A gas discharge port 83 communicating with the discharge chamber 51 from the compression space 78 formed between the wraps 74 and 75 is provided in the half of the rotating shaft 54 of the first scroll 52 on the end plate 58 side. Also, the first
The rotating shaft 54 of the scroll 52 is connected to a bearing 84 provided in the boss portion of the first housing member 59 and the discharge chamber 51.
is supported by a bearing 85 provided in the cylindrical portion 72 of the
It is designed to be able to rotate at a fixed position in the axial direction, and
It is directly connected to the electric motor 56.

In a scroll compressor with this structure, the first and second scrolls 52 and 53 are rotated in the same direction to compress the refrigerant in the compression space 78, and vibrations during compression operation of the first and second scrolls 52 and 53 are This allows the scroll compressor to be used for high-speed or large-scale applications.

(c) Problems to be solved by the invention However, the conventional scroll compressor is
7, a sealed space 61 formed between the end plate 58 of the first scroll 52 and the inner wall 60 of the first housing member 59 facing thereto, and a sliding ring 62 between the end plate 63 of the second scroll 53 and the sealed space 61 formed between the end plate 58 of the first scroll 52 and the inner wall 60 of the first housing member 59 facing thereto. Since the refrigerant in the compression space 78 that is in the middle of compression is supplied to the sealed space 66 formed between the inner walls 65 of the second housing 64 facing each other and presses the first and second scrolls 52 and 53, the start-up Sometimes, the axial gap opens more than necessary, causing a delay in compression within the compression space 78, lowering the refrigeration capacity at the initial stage of startup, and causing the Oldham ring 82 to be separated between the end plate 58 of the first scroll 52 and the second scroll 53. Since it is provided on the outer periphery of the rotating scroll compression element between the flange and the wrap 74.7
5, and a sliding space in the radial direction must be ensured, resulting in problems such as an increase in external dimensions.

This invention solves the above-mentioned problems by making the axial gap between the first and second scrolls a constant interval, preventing a decrease in the refrigerating capacity at startup, and creating a scroll compressor with reduced external dimensions. It is intended to provide.

(d) Means for Solving the Problems This invention stores an electric element and a scroll compression element in a closed container, and the scroll compression element is directly connected to the electric element by standing a spiral wrap on an end plate. a first scroll having an indirectly connected axis;
has an axis eccentric to the center of the axis of the scroll;
a second scroll having a spiral wrap erected on an end plate that faces and engages with the scroll; a main frame having a main bearing that pivotally supports the shaft of the first scroll; an auxiliary frame having an auxiliary bearing that pivotally supports the shaft; and an auxiliary frame that is attached to one of the first and second scrolls so as to restrict the movement of the other scroll in the axial direction; The first scroll is rotatably supported by the main frame or the auxiliary frame, and the second scroll is pivotally supported by the main frame or the auxiliary frame.
In this scroll compressor, a discharge hole is provided in the center of one of the shafts of the scroll, and the regulating member and the scroll separated from the regulating member are fixed by a cylindrical member.

Further, in the present invention, the regulating member and a scroll that faces and engages with the scroll whose axial movement is restricted by the regulating member are fixed to a plurality of mouth-shaped members.

(f) Effect By having the above configuration, the present invention fixes the regulating member and the scroll separated from the regulating member with a cylindrical member, limits the rotating range of the scroll, and This prevents the external dimensions from increasing.

Furthermore, with the above configuration, the present invention fixes the regulating member and the scroll separated from the regulating member with a plurality of mouth-shaped members, and limits the rotating range of the scroll, thereby improving the speed of the scroll compressor. This prevents the outer dimensions in the radial direction from increasing.

(f) Examples The present invention will be explained below based on the examples shown in FIGS. 1 to 3.

1 is a closed container, inside this container there is an electric element 2 on the lower side,
The scroll compression elements 3 are fully housed on the upper side. The electric element 2 is composed of a stator 4 and a rotor 5 disposed inside the stator. An air gap 6 is formed between the stator 4 and the rotor 5. A passage 7 is formed by cutting out a portion of the outer periphery of the stator 4.

A main frame 8 is mounted in pressure contact with the inner wall of the closed container 1, and a main bearing 9 is provided in the center of this frame. Reference numeral 10 denotes an auxiliary frame which is also attached in pressure contact with the inner wall of the closed container 1, and this auxiliary frame is provided with an auxiliary bearing 11 eccentrically spaced apart from the main bearing 9 of the main frame 8 by a distance ε. A cylindrical frame 13 is sandwiched between the main frame 8 and the auxiliary frame 10 so as to form a space 12 inside.

The scroll compression element 3 is composed of a first scroll 14 driven by the electric element 2 and a second scroll 15 rotated in the same direction as the first scroll. The first scroll 14 includes a disk-shaped end plate 16, a spiral wrap 17 made of an involute curved line erected on one side of the end plate, and a spiral wrap 17 projecting from the center of the other side of the end plate 16. Main drive shaft 1 inserted and fixed into rotor 5
It consists of 8. and the first scroll 14
constitutes the drive side scroll.

The second scroll 15 includes a disk-shaped end plate 19, a spiral wrap 20 made of an involute curved line standing upright on one side of the end plate, and a spiral wrap 20 that projects from the center of the other side of the end plate 19. It is composed of a driven shaft 21. and,
The second scroll 15 constitutes a driven scroll.

1st and 2nd scroll 14.15 is lap 17.20
are arranged to face each other in the space 12 and engage with each other to form a plurality of compressed spaces 22 inside.

Reference numeral 23 denotes a regulating member that regulates the movement of the second scroll 15 in the axial direction, and this regulating member is formed in a flat ring shape.
It is attached to a cylindrical member 25 that is in contact with the end plate 20 of the second scroll 15 and fixed to the outer periphery of the end plate 16 of the first scroll 14 with a detent member 24 using a similar detent member 26 .

An annular pressure chamber 27 is provided in the end plate 20 of the second scroll 15 on the side of the contact surface with the regulating member 23 . Inside this pressure chamber, annular sealing members 28 and 29 each having an opening-shaped cross section are housed on the inner circumferential side and outer circumferential side, respectively, and elastic members 30 and 31 are disposed at the edges of these seals. Further, the inside of the pressure chamber 27 communicates with the compression space 22 in the middle of compression through a small hole 32 provided in the end plate 19 of the second scroll 15.

33 is a transmission joint, and this transmission joint is connected to the second scroll 1.
A ring 35 that can fully fit into the sliding surface 34 provided on the outer periphery of the driven shaft 21 of No. It consists of a key 37.

The inside of the closed container 1 is divided by the main frame 8 and the auxiliary frame 10 into a low pressure chamber 38 and a high pressure chamber 39. The space 12 communicates with the low pressure chamber 38 through a hole 40 provided in the main frame 8. In addition, the main frame 8 has a space 12.
Vibrator 4 that releases oil accumulated at the bottom of the inside to the low pressure chamber 38
1 is provided.

The driven shaft 21 is provided with a discharge hole 42 through which the refrigerant compressed within the compression space 22 is communicated with the high pressure chamber 39 .

The space 12 and the high pressure chamber 39 are defined by a seal member 4 provided on the sliding surface between the auxiliary bearing 11 of the auxiliary frame 10 and the driven shaft 21.
3 is sealed.

44 is a suction pipe, and this suction pipe communicates with the inside of the low pressure chamber 38. 45 is a discharge pipe, and this discharge pipe communicates with the inside of the high pressure chamber 39.

In the scroll compressor configured in this manner, when the electric element 2 is rotated, its rotational force is transmitted to the first scroll 14 via the main drive shaft 18. The rotational force transmitted to the first scroll is transmitted to the second scroll 15 via the transmission joint 33, and the second scroll is held between the regulating member 23 and the first scroll 14. Rotate in the same direction as scroll 1. The center of the driven shaft 21 of the second scroll 15 is set at a distance ε from the center of the main drive shaft 18 of the first scroll 14.
It is rotated M at an eccentric position. The first scroll 14 and the second scroll 15 gradually reduce the compression space 22 formed by these scrolls from the outside toward the inside, so that the refrigerant flowing into the low pressure chamber 38 from the suction pipe 43 is mainly used. It is guided into the space 12 through the hole 40 of the frame 8 and flows into the outer compression space 22 for compression. This compressed refrigerant is discharged into the high pressure chamber 39 through the discharge hole 42 provided in the driven shaft 21 of the second scroll 15, and is completely discharged from the discharge pipe 45 to the outside of the closed container 1. Furthermore, the medium-pressure refrigerant that is being compressed is discharged from the small hole 32 into the pressure chamber 27 and acts as a back pressure for the second scroll 15.

The regulating member 23 is attached to the cylindrical member 25 fixed to the outer periphery of the end plate 16 of the first scroll 14 with a rotation prevention member 24 using a similar rotation prevention member 26 to restrict the movement of the second scroll 15 in the axial direction. This limits the clearance between the tips of the wraps 17.20 of the first and second scrolls 14.15 to below a certain level, so that the refrigerating capacity does not decrease even during startup with a small axial pressing force, and the scroll It is fixed to the end plate 16 of the first scroll 14 by a cylindrical member 25 that limits the range of rotation, so as not to increase the radial outer dimensions of the scroll compressor.

The pressure chamber 27 has an annular sealing material 28, 29 housed inside.
By blocking communication with the inside of the space 12, the refrigerant completely discharged from the compression space 22 through the small holes 32 is prevented from leaking into the space 12. That is, the annular sealing members 28 and 29 are vertically deformed at both ends thereof by the refrigerant discharged from the compression space 22, and the refrigerant pressure in the pressure chamber 27 causes the second scroll 15 to move toward the first scroll 14. Even if the second scroll is pressed and the clearance between the second scroll and the regulating member 23 increases, the refrigerant in the pressure chamber 27 can be prevented from leaking into the space 12.

In addition, by installing the elastic members 30, 31 into the sheets 2B, 29, which have a cross-sectional shape, a gap is secured at both ends of the shape of the sealing material, and the sealing material 28.29 The sealing effect within the pressure chamber 27 is not impaired.

The transmission joint 33 fits the ring 35 into the sliding surface 34 of the driven shaft 21 of the second scroll 15, and also connects the key 37 to the regulating member 23 fixed to the first scroll 14.
The second scroll 15 can be rotated in the same direction as the first scroll 14 driven by the electric element 2.

In the above description, the first scroll 14 and the regulating member 23 are connected to the cylindrical member 25 by the rotation preventing member 24°22.
6, but as shown in FIGS. 4 and 5, the first scroll 14 and the regulating member 23 are fixed to a plurality of U-shaped members 46 with bolts 47, and this U-shaped It goes without saying that the same effect can be obtained by fitting the member into the guide groove 49 of the transmission joint 48.

(G) Effects of the Invention As described above, according to the present invention, one of the first and second scrolls and the regulating member that regulates the movement of the other scroll in the axial direction are formed into a cylindrical member. Because it is fixed, there is no need to create play space for the first and second scrolls in the space formed by the main frame and the auxiliary frame, and the radial external dimensions can be prevented from increasing, making it possible to improve the scroll compressor. This makes it possible to reduce the size of the device.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a scroll compressor showing an embodiment of the present invention, FIG. 2 is an enlarged sectional view of the main parts of the scroll compressor, and FIG. 4 is an enlarged sectional view of essential parts of a scroll compressor showing another embodiment, and FIG. 5 is a sectional view cut along B--
A cross-sectional view of the scroll compressor taken along the B line direction,
FIG. 6 is a longitudinal sectional view of a conventional scroll compressor. 1... Airtight container, 2... Electric element, 3...
Scroll compression element, 8... Main frame, 9
...Main bearing, 10...Auxiliary frame, 11
...Auxiliary bearing, 14...First scroll, 1
5... Second scroll, 16.19... End plate, 17.20... Wrap, 18... Main drive shaft, 21... Driven shaft, 23... Regulating member, 24
．． 26... Detent member, 5... Cylindrical member, 27... Pressure chamber, 46... U-shaped member.

Claims (3)

[Claims] 1. A motorized element and a scroll compression element are housed in an airtight container, and the scroll compression element is connected to a first shaft having a shaft directly or indirectly connected to the motorized element by erecting a spiral wrap on an end plate. a scroll, a second scroll having an axis eccentric to the center of the axis of the first scroll and having a spiral wrap erected on an end plate that faces and engages with the first scroll; A main frame having a main bearing that pivotally supports the shaft of the first scroll, an auxiliary frame having an auxiliary bearing that pivotally supports the shaft of the second scroll, and in the first and second scrolls,
A regulating member is attached to one scroll so as to regulate the axial movement of the other scroll, and a regulating member forms a pressure chamber communicating with a compression space in the middle of compression between the end plate of the other scroll. In a scroll compressor in which a discharge hole is provided in the center of one of the shafts of a first scroll and a second scroll that are supported by a main frame or an auxiliary frame, A scroll compressor characterized in that a scroll is fixed with a cylindrical member. 2. The scroll compressor according to claim 1, wherein the regulating member and the scroll separated from the regulating member are each fixed to a cylindrical member with a detent that prevents rotation in the circumferential direction. . 3. A first scroll which houses an electric element and a scroll compression element in an airtight container, and has a shaft connected directly or indirectly to the electric element by having a spiral wrap erected on an end plate. a second scroll having an axis eccentric to the center of the axis of the first scroll and having a spiral wrap erected on an end plate that faces and engages with the first scroll; a main frame having a main bearing that pivotally supports the shaft of the scroll;
an auxiliary frame having an auxiliary bearing that pivotally supports the shaft of the second scroll; and an auxiliary frame that is attached to one of the first and second scrolls so as to restrict the movement of the other scroll in the axial direction; A first scroll and a second scroll that are pivotally supported by the main frame or the auxiliary frame, and a regulating member that forms a pressure chamber that communicates with the compression space that is in the middle of compression between the end plate of the other scroll and the end plate of the other scroll. A scroll compressor having a discharge hole in the center of one of the shafts, characterized in that the regulating member and a scroll separated from the regulating member are fixed by a plurality of U-shaped members. .