JP2919576B2 - Scroll compressor - Google Patents

Description

The present invention relates to a scroll compressor that performs compression by rotating both scrolls in the same direction.

(B) Conventional technology A conventional scroll fluid machine is disclosed in, for example, Japanese Patent Application Laid-Open No. 64-2419.
It is configured as shown in Japanese Patent Publication No. 0. Here, a conventional example will be described with reference to this publication. In FIG. 4, reference numeral 50 denotes a drive scroll disposed at an upper portion, a spiral wrap 52 is provided on a head plate 51, and a discharge port 53 is provided integrally or fixedly at the center of the shaft. 54 is an exhaust path communicating with the discharge port 53 via a valve 55, 56 is a plurality of discharge holes drilled in the radial direction, 57 is a driven scroll arranged below, and a spiral wrap provided on a head plate 58 59 is combined with the wrap 52 of the driving scroll 50, and the boss portion is provided at the bottom.
60 have been issued. 61 is a cylindrical container, 62 is a suction chamber, 63
Is a bearing housing attached to the lower end of the container 61.
Supports the driven scroll 57 via 64 and bolts to the container 61
It is airtightly attached by an O-ring 66 by 65.
Reference numeral 67 denotes an upper housing which is air-tightly attached to the upper end of a container 61 by bolts 68 via an O-ring 69, and has an annular atmospheric pressure chamber 70 formed on the outer periphery thereof. An exhaust port 71 is opened. Reference numeral 72 denotes a bearing for supporting the drive shaft 73 fitted to the upper housing 67, and reference numeral 74 denotes a presser fixed to the upper housing 67 by screws 75 and supporting the bearing 72. 76 and 77 are seals, 78 is a retaining ring that supports the seal 76 fixed to the upper housing 67, 79 is an upper container fixed to the upper housing 67 and the container 61 with bolts 68, and has an exhaust port 71 attached. . Reference numeral 80 denotes an electric motor as a driving source, which is mounted on an upper container 79 via a flange 81 by bolts 82. Reference numeral 83 denotes a rotating shaft of the electric motor 80, which connects the drive shaft 73 with a shaft coupling 84. A suction port 85 is attached to the container 61 for evacuating the object to be evacuated, and a spring 86 presses the valve 55. Reference numeral 87 denotes a joint, which is positioned by a key or projection 88 provided on the drive scroll 50 and a hook 89. Incidentally, the rod 89 is fixed to the driven scroll 57 by a bolt 90.

Further, the drive scroll 50 side slides freely in a groove 91 provided in the joint 87.

A check valve 92 is pressed against an oil absorbing pipe 93 by a leaf spring 94. An oil passage 95 is sealed from the atmospheric pressure chamber 70 by an O-ring 96 and seals 76 and 77. 97 is oil.

In the scroll fluid machine of this structure, the driving scroll
50 and the driven scroll 57 are rotated at a position twisted 180 ° by the joint 87 and the rod 89, and a gas for evacuation from the object to be evacuated is sucked from the suction port 85, and the exhaust path 54, the discharge hole 56, The oil is discharged from the exhaust port 71 to the atmosphere through the air pressure chamber 70, and oil 97 is supplied from the oil passage 95 to the contact surface between the driving scroll 50 and the driven scroll 57 during operation to supply the oil to the suction port 85.
The air is prevented from entering.

(C) Problems to be Solved by the Invention However, the conventional scroll fluid machine has a joint 87 in which the driving scroll 50 and the driven scroll 57 are provided on the outer peripheral portion.
Since both scrolls are rotated and relatively swung by the armature 89 and the armature 89, there is a problem that the structure of the vacuum pump unit becomes unnecessarily large.

The present invention solves the above problem, and simplifies the structure for rotating both scrolls in the same direction.
It is an object of the present invention to provide a scroll compressor that can be reduced in size.

(D) Means for Solving the Problems The present invention accommodates an electric element and a scroll compression element in a closed container, and the scroll compression element is directly or directly attached to the electric element by erecting a spiral wrap on a head plate. A first scroll having an indirectly connected axis, an axis eccentric from the center of the axis of the first scroll by an interval ε,
A second scroll in which a spiral wrap is erected on a head plate facing and meshing with the first scroll; a main frame having a main bearing for supporting a shaft of the first scroll; An auxiliary frame having an auxiliary bearing for supporting the axis of the scroll, and a drive connecting device for rotating the second scroll in the same direction as the first scroll. In a scroll compressor in which the diameter of one of the end plates is smaller than the diameter of the other end plate, the drive connecting device is provided between the end plates of the first and second scrolls, and the drive connecting device is connected to the outer periphery of the wrap. And keys formed integrally with the ring and sliding in the grooves of the respective end plates. Further, the keys are paired into two sets of keys. Are orthogonal to each other, and the interval between these keys is set to be about twice as large as the eccentricity ε when fitted into the groove of the small end plate than when fitted into the groove of the large end plate. is there.

(E) Function The present invention is configured as described above, and thus, the first and second aspects are provided.
The distance between the keys of the drive coupling device provided on the outer periphery of the wrap of the second scroll is set to be about twice as large as the eccentricity ε when the diameter of the end plate is smaller than that of the larger end plate. Key so that it does not affect the wrap of the first and second scrolls,
The outer diameter of the drive coupling device is reduced, and the outer diameter in the radial direction of the scroll compression element is reduced to a necessary minimum.

(F) Embodiment The present invention will be described below with reference to the embodiment shown in FIGS.

Reference numeral 1 denotes a closed container in which an electric element 2
However, the scroll compression elements 3 are respectively housed in the lower side. The electric element 2 includes a stator 4 and a rotor 5 arranged inside the stator. Stator 4 and rotor 5
An air gap 6 is formed between them. Reference numeral 7 denotes a main frame, on which a main bearing 8 is provided at the center. Reference numeral 9 denotes an auxiliary frame, which is provided with an auxiliary bearing portion 10 eccentric from the main bearing 8 of the main frame 7 by an interval ε. A cylindrical frame 12 is fixed with bolts 13 between the main frame 7 and the auxiliary frame 9 so as to form a hollow chamber 11 therein.

The scroll compression element 3 includes a first scroll 14 driven by the electric element 2 and a second scroll 15 that rotates in the same direction as the first scroll. The first scroll 14 has a cylindrical end plate 16, a spiral wrap 17 formed of an involute-shaped curve erected on one surface of the end plate, and a center of the other surface of the end plate 16. And a drive shaft 18 inserted and fixed to the child 5. Further, the first scroll 14 constitutes a driving scroll. The second scroll 15 has a cylindrical end plate 19, a spiral wrap 20 formed of an involute-shaped curve erected on one surface of the end plate, and a driven shaft protruding from the center of the other surface of the end plate 19. 21.
The second scroll 15 forms a driven scroll. The diameter B of the end plate 19 of the second scroll 15 is the first
The first and second scrolls 14 and 15 are formed to be smaller than the diameter A of the end plate 16 of the scroll 14 by about twice the eccentric distance ε between the shafts 18 and 21 of the first and second scrolls 14 and 15.

The first scroll 14 is supported on the drive shaft 18 by the main bearing 8 of the main frame 7, and the second scroll 15 is
The driven shaft 21 is supported by the auxiliary bearing 10 of the
The five wraps 17 and 20 face each other in the hollow chamber 11 so as to engage with each other, so that a plurality of compression spaces 22 are formed therein.

The drive shaft 18 is provided with a discharge hole 24 for discharging the refrigerant compressed in the compression space 22 into a space 23 between the electric element 2 and the scroll compression element 3 in the closed casing 1.

Reference numeral 25 denotes a drive connection device provided between the first and second scrolls 14 and 15, the drive connection device comprising a ring 26 provided on the outer periphery of the wraps 17 and 20, and a head plate of the first scroll 14. The first keys 28, 28 fitted in the first key grooves 27, 27 provided on the outer periphery of the 16 and the end plate 19 of the second scroll 15
And second keys 30, 30 fitted in second key grooves 29, 29 provided on the outer periphery of the second key groove. First key 28,28
Are opposed at an interval C, and the second keys 30, 30 are also opposed at an interval D. The interval D between the keys 30, 30 is formed to be smaller than the interval C between the keys 28, 28 by about twice the eccentric interval ε. These first and second keys are orthogonal. The drive coupling device 25 slides the keys 28, 28, 30, 30 in the key grooves 27, 27, 29, 29, so that the first and second scrolls 14, 15 relatively swing. Like that.

Reference numerals 31 and 32 denote sealing members provided between the main frame 7 and the end plate 16 and between the auxiliary frame 9 and the end plate 19.

Reference numeral 33 denotes a suction pipe, which communicates with the inside of the hollow chamber 11. Reference numeral 34 denotes a discharge pipe, which is provided on the upper portion of the closed container 1.

In the scroll compressor configured as described above, when the electric element 2 is rotated, the rotational force is transmitted to the first scroll 14 via the drive shaft 18. The rotational force transmitted to the first scroll is transmitted to the second
The second scroll is rotated in the same direction as the first scroll 14. Then, the second scroll 15 rotates at a position in which the center of the driven shaft 21 is eccentric by the interval ε with respect to the center of the drive shaft 18 of the first scroll 14. Therefore, the first scroll 14 and the second scroll 14
The scroll 15 is such that the compression space 22 formed by these scrolls is gradually reduced from the outside to the inside, and the refrigerant flowing into the hollow chamber 11 from the suction pipe 33 is compressed outside the compression space 22.
It flows into 22 and is compressed. The compressed refrigerant is discharged from the discharge hole 24 provided in the drive shaft 18 of the first scroll 14 into the space 23 and discharged from the discharge pipe 34 to the outside of the closed container 1 through the air gap 6 of the electric element 2. Is done.

The diameter B of the end plate 19 of the second scroll 15 is set to be smaller than the diameter A of the end plate 16 of the first scroll 14 by about twice the eccentric interval ε, so that the diameter of the end plate 16 having a large diameter during operation is reduced. It does not jump out in the direction.
Therefore, the scroll compression element 3 is the first scroll 14
By determining the diameter A of the end plate 16, the outer diameter in the radial direction can be provided with a minimum necessary clearance from the inside of the hollow chamber 11.

A drive connecting device 25 for rotating the second scroll 15 in the same direction together with the first scroll 14 is provided with a ring 26 on the outer periphery of the wraps 17 and 20 of the first and second scrolls 14 and 15, The keys 28, 28, 30, 30 are fitted into the key grooves 27, 27 of the end plate 16 of the scroll 14 and the key grooves 29, 29 of the end plate 19 of the second scroll 15, so that the end plates 16, 19
Can be arranged in a dead space between these end plates formed face to face, and the scroll compression element 3
The outer diameter dimension of the is not increased.

In addition, the drive coupling device 25 is a keyway of the small diameter end plate 19.
The distance D between the keys 30, 30 fitted in the 29, 29 is made about twice as long as the distance C between the keys 28, 28 fitted in the key grooves 27, 27 of the end plate 16 having a large diameter. Thus, the sliding range of each key 28, 28, 30, 30 can be made large enough not to affect the wraps 17, 20 of the first and second scrolls 14, 15, and the outer peripheral portion of the end plate 16 having a large diameter. So that it does not protrude radially from the rotation range. For this reason, the drive connecting device 25 enables the outer diameter of the scroll compression element 3 to be reduced to a necessary minimum.

(G) Effects of the Invention As described above, according to the present invention, the drive coupling device is provided with the first
. A ring provided between the end plates of the second scroll and the drive connecting device is arranged on the outer periphery of the wrap; and a key formed integrally with the ring and sliding in the groove of each end plate. Further, the keys are paired with two sets of keys, and the two sets of keys are orthogonal to each other. The eccentric distance ε is set to be about twice as small as that of the drive fitting device, so that the key of the drive connecting device does not affect the wrap of the first and second scrolls. Can be minimized, and the drive coupling device can be prevented from jumping out of the rotation range of the scroll compression element.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a scroll compressor showing one embodiment of the present invention, FIG. 2 is a sectional view of the scroll compressor cut along the line II-II of FIG. 1, and FIG. FIG. 4 is a plan view of a drive coupling device, and FIG. 4 is a sectional view of a scroll fluid machine showing a conventional example. DESCRIPTION OF SYMBOLS 1 ... Closed container, 2 ... Electric element, 3 ... Scroll compression element, 7 ... Main frame, 8 ... Main bearing, 9 ... Auxiliary frame, 10 ... Auxiliary bearing, 14 ... First scroll ,
15 ... second scroll, 16,19 ... end plate, 17,20 ... lap, 18 ... drive shaft, 21 ... driven shaft, 25 ... drive coupling device, 26 ... ring, 27,27, 29,29 …… keyways, 28,28,30,
30 …… Key.

Claims (1)

(57) [Claims] An electric element and a scroll compression element are housed in an airtight container, and the scroll compression element is provided with a shaft which is directly or indirectly connected to the electric element by forming a spiral wrap on a head plate. A first scroll having an axis decentered from the center of the axis of the first scroll by an interval ε,
A second scroll in which a spiral wrap is erected on a head plate facing and meshing with the first scroll; a main frame having a main bearing for supporting a shaft of the first scroll; An auxiliary frame having an auxiliary bearing for supporting the axis of the scroll, and a drive connecting device for rotating the second scroll in the same direction as the first scroll. In a scroll compressor in which the diameter of one of the end plates is smaller than the diameter of the other end plate, the drive connecting device is provided between the end plates of the first and second scrolls, and the drive connecting device is connected to the outer periphery of the wrap. And keys formed integrally with the ring and sliding in the grooves of the respective end plates. Further, the keys are paired into two sets of keys. And that the distance between these keys is about twice as large as the eccentric distance ε when fitted into the groove of the smaller end plate than when fitted into the groove of the larger end plate. Features scroll compressor.