JP3360303B2 - Scroll type fluid machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type fluid machine.

[0002]

2. Description of the Related Art Conventionally, in a scroll type fluid machine,
An Oldham mechanism used to maintain a relative angle between two scrolls meshing with each other is to dispose an Oldham coupling on the back of the movable scroll and to provide a key and a key between the housing and the housing facing the rear of the movable scroll. It is known that a groove is provided, but in the case of this structure, if the positioning accuracy between the housing and the fixed scroll member is poor, a gap between the two scrolls is affected, and there is a problem that a leakage loss occurs.

[0003] On the other hand, as one in which the Oldham coupling is arranged between both scrolls and both scrolls are provided with a key and a key groove, for example, one disclosed in Japanese Patent Publication No. 57-49721 is known. . As shown in FIG. 8, the conventional scroll type fluid machine has a head plate A1.
A fixed scroll A comprising a scroll A2 fixed to one side outer surface of the head plate A1, and a movable scroll B similarly comprising a head plate B1 and a scroll B2 fixed to one side outer surface of the head plate B1. The fixed and movable scrolls A and B are overlapped with each other so that the spirals A2 and B2 mesh with each other, and an Oldham ring C is disposed at a radially outer portion of each of the spirals A2 and B2. A rotation restricting means comprising a key and a key groove is provided between the Oldham ring C and the fixed scroll A and the movable scroll B to prevent the Oldham ring C from rotating with respect to the fixed scroll A and to prevent the movable scroll B from rotating. The movable scroll B is caused to revolve with respect to the fixed scroll A by preventing rotation with respect to the Oldham ring C. The rotational drive, the respective spiral body A
2, the volume of the working space formed between B2 is changed,
The fluid sucked into the working space is compressed.

[0004]

However, in the above-mentioned scroll type fluid machine, an Oldham ring C is interposed in a radially outer portion of the scrolls A2 and B2 in the scrolls A and B, and the Oldham ring C is provided. The movable scroll B with the ring C
Are driven to revolve with respect to the fixed scroll A, so that the scrolls A2, B
It is necessary to prevent interference between the Oldham ring 2 and the Oldham ring C. For this reason, the Oldham ring C must be sized in consideration of the revolution trajectory of the spiral body. As a result, the Oldham ring C has a large diameter. It is necessary to form the Oldham ring C, and the Oldham ring C
However, there is a problem that the casing for accommodating the above, and consequently the entire structure, becomes large.

Further, a suction passage for suction fluid to be sucked into the working space is formed on the outer peripheral side of each scroll A2, B2 in each of the scrolls A, B, as described above. When the Oldham ring C is disposed at a radially outer portion of each of the spiral bodies A2 and B2, the suction fluid sucked into the suction passage is stirred by the movement of the Oldham ring C during driving, and the fluid is stirred. The agitation loss increases, and the keyway and the key of the rotation restricting means provided between the Oldham ring C and the fixed scroll A and the movable scroll B have a small contact area with each other. The inertia force of the Oldham ring C itself acts on the key groove and the key at the time of the revolving drive, and the surface pressure of the key and the key groove becomes excessive, and the key and the key Such as baking accident or cause abnormal wear of the groove there is a problem that occurs.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to reduce the size of a ring-shaped member constituting an Oldham ring and to prevent agitation of suction fluid by the ring-shaped member. It is another object of the present invention to provide a scroll-type fluid machine capable of preventing abnormal wear and seizure of an engagement portion provided between the ring-shaped member and one of the scrolls.

[0007]

In order to achieve the above object, the present invention comprises first and second scrolls 5 and 6 having a head plate 7 and a spiral body 8, and the first and second scrolls 5 and 6 are provided. , 6 are overlapped so that the spiral bodies 8, 8 mesh with each other, and the working space formed between the spiral bodies 8, 8 by the relative revolving motion of the first and second scrolls 5, 6. In the scroll-type fluid machine in which the volume of the first and second scrolls 5 and 6 is changed, the outer peripheral portion of one end plate 7 of the first and second scrolls 5 and 6 includes at least a pair of flat portions 9 and 9 which are parallel to each other. Flat part 9,
A ring-shaped member 10 having a flat portion 11, 11 slidable along the flat portions 9, 9 is provided, and the ring-shaped member 10 is orthogonal to the flat portions 11, 11. Engaging portions 13 and 13 having extending flat portions 12 and 12 are engaged with the other of the first and second scrolls 5 and 6 so as to slidably engage with the engaging portions 13 and 13. Part 14,
14 is provided.

The first and second scrolls 5, 6
Flat portions 9, 9 provided on the outer peripheral portion of one of the end plates 7
It is preferable to provide notches 15 in at least one of the flat portions 11 of the ring-shaped member 10.

[0009]

In the above-mentioned scroll type fluid machine, the ring-shaped member 10 is provided on the outer peripheral portion of the one end plate 7 of the first and second scrolls 5, 6, and the flat portions 11 provided on the inner peripheral side thereof. An engagement portion 11 is inserted and fitted to each of the flat portions 9, 9 provided on the outer peripheral side of the end plate 7, and an engagement portion provided on the ring-shaped member 10 in a direction orthogonal to the flat portions 11, 11. 13, 13 are slidably engaged with engaged portions 14, 14 provided on the other side of the scrolls 5, 6.

When the scroll type fluid machine is driven, the engaging portions 13, 1 provided on the ring-shaped member 10 are provided.
3 is engaged with the engaged portions 14 provided on the other side of each of the scrolls 5 and 6, and the rotation of the ring-shaped member 10 is restricted along the engaged portions 14 while the rotation of the ring-shaped member 10 is restricted. And the flat portions 11, 11 provided on the ring-shaped member 10 are inserted into the flat portions 9, 9 provided on the one end plate 7 of the scrolls 5, 6 in an opposed manner. Thus, while the one side of each of the scrolls 5 and 6 is restricted from rotating with respect to the ring-shaped member 10, the scrolls 5 and 6 are slid in a direction orthogonal to the sliding direction of the ring-shaped member 10. One side of each of the scrolls 5, 6 is driven to revolve while the other side is prevented from rotating. At this time, the ring-shaped member 10 is inserted into the outer peripheral portion of one end plate 7 of each of the scrolls 5 and 6, and
A pair of slidable flat portions 9 and 11 are formed on the end plate 7 and the ring-shaped member 10, and the rotation of the ring-shaped member 10 with respect to the end plate 7 is controlled by the flat portions 9 and 11. Since the ring-shaped member 10 does not interfere with the scroll 8 of each of the scrolls 5 and 6, the ring-shaped member 10 can be reduced in size. The revolving drive of the scrolls 5 and 6 becomes possible, and the whole structure can be downsized.

Further, as described above, the ring-shaped member 10 is provided on the outer peripheral portion of the one end plate 7 of each of the scrolls 5 and 6.
By disposing, the ring-shaped member 10 does not agitate the suction passage formed on the outer peripheral side of each spiral body 8 in each of the scrolls 5 and 6 during driving, and the fluid agitation loss is reduced. Is reduced. Further, slidable flat portions 9 and 11 are formed on the ring-shaped member 10 and the one end plate 7 of each of the scrolls 5 and 6, and are brought into surface contact with the flat portions 9 and 11, respectively. Therefore, the surface pressure of the contact surface portion of the ring-shaped member 10 in the direction in which the reciprocating inertia force acts can be reduced, so that abnormal wear and seizure accidents on the flat portions 9 and 10 can be prevented.
Abnormal wear and seizure accidents at the engaging portion and the engaged portion can be prevented, and the reliability thereof can be improved.

Notches 15, 9 are provided on at least one of the flat portions 9, 9 provided on the outer peripheral portion of the one end plate 7 of each of the scrolls 5, 6 and the flat portions 11, 11 of the ring-shaped member 10. 15 are provided, the notches 15, 1
5, the sliding surface in each of the flat portions 9 and 11 can be reduced to reduce the sliding resistance.

[0013]

FIG. 1 shows a scroll type fluid machine used for a compressor. The scroll type fluid machine is supported on a frame 2 at an upper inside portion of a closed casing 1 and provided on a lower side of the casing 1. A compression element 4 driven by a motor 3 is provided.

The compression element 4 is provided with a first scroll 5 fixed to the upper part of the frame 2, interposed between the first scroll 5 and the frame 2, and provided with the motor 3.
The scrolls 5 and 6 each include a mirror plate 7 and a spiral body 8 fixed to an outer surface of one side of the mirror plate 7. Are vertically arranged so that the respective spiral bodies 8, 8 mesh with each other, and the respective spiral bodies 8, 8 are driven by the revolving drive of the second scroll 6 with respect to the first scroll 5.
The volume of the working space S formed therebetween is changed to compress the suction refrigerant drawn into the working space S from the suction passage S1 formed on the outer peripheral side of each of the spiral bodies 8, 8. .

In the scroll type compressor having the above-described structure, as shown in FIGS. 2 and 3, the outer peripheral portion of the end plate 7 of the second scroll 6 is notched so as to face the opposite surface. A pair of parallel flat portions 9 and 9 are formed to face each other, and are fitted between the scrolls 5 and 6 on the frame 2 on the outer periphery of the end plate 7 of the second scroll 6. The first scroll 5 is provided with a ring-shaped member 10 that is driven to revolve.

As shown in FIGS. 4 and 5, the ring-shaped member 10 has a substantially elliptical ring shape which can be inserted into the outer peripheral portion of the end plate 7 of the second scroll 6, and In the major axis direction on the inner peripheral side of the member 10,
In addition to forming the parallel plane portions 11, 11 which are opposed to the plane portions 9, 9 provided on the second scroll 6 and are slid along the plane portions 9, 9, respectively, Part 1
A projecting engagement portion 13 having flat portions 12, 12 extending on one side in the axial direction in a direction perpendicular to the flat portions 11, 11 at a central portion in the longitudinal direction on the outer surface on the opposite side of the first portion 11. , 1
3 is formed.

As shown in FIG. 6 and FIG. 7, the end plate 7 of the first scroll 5 has a lower surface at a position opposed to the engaging portions 13 of the ring-shaped member 10. , A pair of concave groove-shaped engaged portions 1 extending in the radial direction
4, 14 are formed, and the respective engaging portions 13, 13 of the ring-shaped member 10 are slidably engaged with the respective engaged portions 14.14.

The engagement portions 13, 13 provided on the ring-shaped member 10 are separated from each other by the respective flat portions 12, 12.
By engaging the engaged portions 14, 14 provided on the scroll 5 so as to be in contact with the side wall surfaces, the ring-shaped member 10 is restricted from rotating while being engaged with the engaged portions 14, 14 of the first scroll 5. The ring-shaped member 10 on the outer peripheral portion of the end plate 7 of the second scroll 6, and the flat portions 11, 11 on the inner peripheral side thereof are disposed on the outer peripheral side of the end plate 7. The second scroll 6 is slid in the direction perpendicular to the sliding direction of the ring-shaped member 10 while being restricted from rotating with respect to the ring-shaped member 10 by being inserted so as to face the provided flat portions 9, 9. Thus, the first scroll 5 is revolved while the second scroll 6 is prevented from rotating.

At this time, a pair of flat portions 9, 9 parallel to the outer peripheral portion of the end plate 7 of the second scroll 6 are formed,
A pair of flat portions 11, 11 slidable with respect to the flat portions 9, 9 on the inner peripheral side of the ring-shaped member 10.
The ring-shaped member 10 is inserted into the outer peripheral portion of the end plate 7 such that the flat portions 9 and 11 face each other, and the rotation of the ring-shaped member 10 with respect to the end plate 7 is controlled. First, since the ring-shaped member 10 does not interfere with the spiral body 8 of each of the scrolls 5 and 6, the ring-shaped member 10 can be reduced in size. During use, the second scroll 6 can be driven to revolve with respect to the first scroll 5, and the overall structure can be reduced in size.

Second, as described above, the ring-shaped member 1 is provided on the outer peripheral portion of the end plate 7 of the second scroll 6.
0, the ring-shaped member 10 does not agitate the suction passage S1 formed on the outer peripheral side of each of the scrolls 8 in the scrolls 5 and 6 during driving. Thirdly, it is possible to reduce the loss of fluid agitation, and thirdly, the end plate 7 of the second scroll 6 and the ring-shaped member 10 are provided with a pair of slidable flat portions 9,
Since the flat portions 11 are formed so as to make the plane portions 9 and 11 come into surface contact with each other, the surface pressure of the contact surface portion of the ring-shaped member 10 in the direction in which the reciprocating inertial force acts can be reduced. It is possible to prevent abnormal wear and seizure loss on the flat portions 9 and 11, and prevent abnormal wear and seizure accidents on the engaging portion 13 and the engaged portion 14, thereby improving reliability.

In the embodiments of FIGS. 2, 3 and 4 and 5, each of the flat portions 9, 9 provided on the outer peripheral side of the second scroll 6 and each of the flat portions 9, 9 provided on the inner peripheral side of the ring-shaped member 10 are provided. The flat portions 9 and 11 are respectively added to the flat portions 11 and 11.
Notch 15,1 in the middle part except a part of both sides in the length direction
5 is formed, and each of the cutouts 15 is provided. The sliding surfaces of the flat portions 9 and 11 are reduced to reduce the sliding resistance during sliding. The notches 15 can be formed only on one side of each of the flat portions 9 and 11.

Further, in the embodiment of FIG. 1, a suction pipe 16 opening to the suction passage S1 is connected to the casing 1,
And the first scroll 5 inside the casing 1.
The upper part of the first scroll is connected to a bypass pipe 17 leading to a space below the motor 3, and the discharge pipe 18 is connected to an intermediate portion between the frame 2 and the motor 3 in the casing 1. 5 by the revolving drive of the second scroll 6 with respect to the suction pipe 16 from the suction pipe S1.
And compresses the refrigerant sucked into the working space S formed between the spirals 8 of the scrolls 5 and 6 through the discharge holes 19 formed in the center of the end plate 7 of the first scroll 5. The discharged refrigerant discharged into the upper inside space of the casing 1 is guided from the bypass pipe 17 to the lower space of the motor 3, and passes through a refrigerant passage and an air gap formed on the outer peripheral portion of the motor 3. After cooling the motor 3, the motor 3 is guided to an intermediate space between the motor 3 and the frame 2, and discharged from the intermediate space to the outside via the discharge pipe 18. In FIG. 1, reference numeral 20 denotes a drive shaft that extends upward from the motor 3 and drives the second scroll 6;
Reference numeral 21 denotes a partition plate that partitions the upper surface of the first scroll 5 from the discharge chamber 22. Further, in the above embodiment, the scroll type compressor has been described.
The present invention is not limited to scroll type compressors, but can be applied to scroll type fluid machines used for other purposes.

[0023]

As described above, in the scroll type fluid machine according to the present invention, at least one pair of parallel flat portions 9, 9 is provided on the outer peripheral portion of one end plate 7 of the first and second scrolls 5, 6. And a ring-shaped member 10 having flat portions 11, 11 facing each of the flat portions 9, 9 and slidable along each of the flat portions 9, 9. Engagement portions 13, 13 having flat portions 12, 12 extending in a direction orthogonal to the flat portions 11, 11;
Provided on the other of the first and second scrolls 5 and 6,
Engaged part 1 slidably engaged with the engagement parts 13, 13
4 and 14, that is, the ring-shaped member 1
0 is provided in direct relation to the space between the first and second scrolls 5 and 6, so that each scroll 5 is compared with the conventional example in which an Oldham coupling is provided between the back surface of the second scroll 6 and the housing (frame). The ring-shaped member 10 is fitted to the outer peripheral surface of the end plate 7 while the gap between the members 6 and 6 can be controlled with high precision and the leakage loss can be reduced.
This ring-shaped member 10 is formed in an arbitrary size without considering the interference with each of the scrolls 8 in each of the scrolls. Therefore, the ring-shaped member 10 can be reduced in size as compared with the conventional example described above, and the entire structure can be reduced in size.
Since the slidable flat portions 9 and 11 are formed on the one end plate 7 of each of the scrolls 5 and 6, respectively, the contact surface portion of the ring-shaped member 10 in the direction in which the reciprocating inertial force acts is formed. The surface pressure can be reduced, so that abnormal wear and seizure loss in the flat portions 9 and 11 can be prevented, and abnormal wear and seizure accidents in the engaging portion 13 and the engaged portion 14 can be prevented. That can improve reliability. Further, since the ring-shaped member 10 is fitted on the outer peripheral surface of the end plate 7, an increase in fluid stirring loss can be prevented.

Notches 15, 9 are provided on at least one of the flat portions 9, 9 provided on the outer peripheral portion of the one end plate 7 of each of the scrolls 5, 6 and the flat portions 11, 11 of the ring-shaped member 10. 15, the notches 15, 1
5, the contact resistance of each of the flat portions 9, 11 can be reduced.

[Brief description of the drawings]

FIG. 1 is a partially omitted cross-sectional view of a scroll compressor shown as an example of the present invention.

FIG. 2 is a plan view of a second scroll.

FIG. 3 is a sectional view taken along line XX of FIG. 2;

FIG. 4 is a plan view of a ring-shaped member.

FIG. 5 is a sectional view taken along line YY of FIG. 4;

FIG. 6 is a bottom view of the first scroll.

FIG. 7 is a sectional view taken along line ZZ of FIG. 6;

FIG. 8 is a sectional view showing a conventional scroll type fluid machine.

[Explanation of symbols]

 5 First scroll 6 Second scroll 7 End plate 8 Spiral body 9 Flat part 10 Ring-shaped member 11 Flat part 12 Flat part 13 Engaging part 14 Engaged part 15 Notch

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-2-227581 (JP, A) JP-A-1-138387 (JP, A) JP-A-1-29994 (JP, A) JP-A-2- 271091 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) F01C 1/02 F03C 2/02 F04C 2/02 F04C 18/02

Claims (2)

(57) [Claims] A first and a second having a head plate and a spiral body.
Scrolls 5 and 6 are provided, and the first and second scrolls 5 and 6 are overlapped so that the respective spiral bodies 8 and 8 mesh with each other, and the relative revolving motion of the first and second scrolls 5 and 6 is provided. Accordingly, in the scroll-type fluid machine in which the volume of the working space formed between the spiral bodies 8, 8 is changed, the outer peripheral portions of the end plates 7 of the first and second scrolls 5, 6 are mutually connected. It has at least a pair of parallel plane parts 9, 9 and said plane parts 9, 9
And a flat portion 1 slidable along the flat portions 9, 9
A ring-shaped member 10 having engaging portions 13 and 13 having flat portions 12 and 12 extending in a direction orthogonal to the flat portions 11 and 11;
Engaged parts 14, 14 slidably engaged with the engagement parts 13, 13 on the other of the first and second scrolls 5, 6.
A scroll type fluid machine comprising: 2. At least one of the flat portions 9, 9 provided on the outer peripheral portion of one end plate 7 of the first and second scrolls 5, 6 and the flat portions 11, 11 of the ring-shaped member 10.
2. The scroll-type fluid machine according to claim 1, wherein the notches are provided.