JP6729158B2 - Scroll fluid machinery - Google Patents

Description

The present invention relates to a scroll fluid machine used as a compressor, an expander, a blower, or the like.

Conventionally, in a scroll fluid machine, there is known a structure in which a plurality of crankshafts are connected to an outer peripheral portion outside a portion of a orbiting scroll in which an orbiting wrap is provided. Patent Document 1 and Patent Document 2 disclose such a scroll fluid machine. Patent Document 1 describes a structure in which two crankshafts are connected to one side and the other side of the outer peripheral part of the orbiting scroll. In Patent Document 2, three crankshafts are circumferentially connected to the outer peripheral part of the orbiting scroll. The structure in which the crankshaft is connected is described.

JP, 2004-36591, A JP, 2003-120552, A

In the structure in which the crankshaft is connected to the outer peripheral side of the orbiting wrap, it is necessary to secure a space to connect the crankshaft on the outer peripheral side of the orbiting wrap, so the outer diameter of the entire orbiting scroll increases and the weight also increases. Will end up. The larger the orbiting scroll, the larger the exterior (housing) of the scroll fluid machine. There has been a demand for downsizing of scroll fluid machines in terms of manufacturing cost reduction and securing of installation space. Further, in order to perform maintenance of the orbiting wrap of the orbiting scroll (for example, replacement of the tip seal), it is necessary to disconnect the crankshaft and the orbiting scroll as a whole, which improves the efficiency of maintenance work. There was room.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a scroll fluid machine in which a plurality of crankshafts are connected on the outer peripheral side of an orbiting wrap, and can provide a structure capable of reducing the size of an orbiting scroll and improving maintainability.

The present invention provides a fixed scroll in which a spiral fixed wrap is provided on a plate surface of a fixed side base plate portion, and a spiral rotary wrap that meshes with the fixed wrap is provided on a plate surface of a rotary side base plate part, and The orbiting scroll main body is provided with a plurality of cutout portions that extend inward in the radial direction from the end face of the outer peripheral portion of the base plate portion, and the orbiting scroll main body is fixed via a fastening member that passes through the outer peripheral portion, and the orbiting scroll main body is A rotating scroll base in which a plurality of bearing portions that enter the inside of the cutout portion in a fixed state are provided according to the cutout portion, and a plurality of crankshafts in which an eccentric shaft portion that is inserted into the bearing portion is provided. The present invention relates to a scroll fluid machine having the same.

The orbiting-side substrate portion is provided with a plurality of extension pieces that extend radially outward and through which the fastening member is inserted, and are spaced apart in the circumferential direction. The orbiting scroll base includes the extension pieces. It is preferable that a concave portion for accommodating is provided, and the cutout portion is located between the adjacent extending pieces.

In the orbiting scroll body, the orbiting wraps are provided on both sides of the orbiting side base plate portion, the pair of fixed scrolls are provided on both sides of the orbiting side base plate portion, and the orbiting scroll base is provided in a central portion thereof. It is preferable that the orbiting scroll body can be attached to and detached from the hole from one side.

According to the present invention, in the scroll fluid machine in which a plurality of crankshafts are connected to the outer peripheral side of the orbiting wrap, it is possible to realize a configuration in which the orbiting scroll can be downsized and maintainability can be improved.

It is a figure showing one side of a scroll fluid machine concerning one embodiment of the present invention. FIG. 2 is a sectional view taken along line II-II in FIG. 1. It is a disassembled perspective view of the orbiting scroll of the scroll fluid machine of FIG. It is an enlarged view of the left end part of FIG. It is a top view which shows typically the orbiting scroll main body fixed to the orbiting scroll base.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing one side surface (for example, a bottom view in the vertical direction or a side view in the horizontal direction) of the scroll fluid machine. 2 is a sectional view taken along the line II-II in FIG. 1, FIG. 3 is an exploded perspective view of the orbiting scroll 2, and FIG. 4 is an enlarged view of the left end portion of FIG. FIG. 5 is a plan view schematically showing the orbiting scroll main body 17 fixed to the orbiting scroll base 18.

In the following description, the thickness direction of the scroll fluid machine, which is parallel to the direction in which the crankshaft 3 faces, is referred to as the “axial direction”. This axial direction is the vertical direction in FIG. 2 (strictly, it is a II-II cross-sectional view, so its left half or right half). For the sake of description, one side in the axial direction may be expressed as the upper side and the other side in the axial direction as the lower side, but the upper and lower sides may be expressed, but this does not mean that the attitude of the scroll fluid machine 1 is limited. When in use, the scroll fluid machine 1 can be arranged so that the crankshaft 3 extends along a direction other than the vertical direction, for example, the horizontal direction.

<Overall structure of scroll fluid machine>
The scroll fluid machine 1 of the present embodiment includes a housing 4, an orbiting scroll 2 rotatably held in the housing 4, a pair of fixed scrolls 5 fixed to the housing 4 so as to sandwich the orbiting scroll 2, and an orbiting scroll. A plurality of crankshafts 3 that rotate the scroll 2 and a rotation synchronization mechanism 45 that synchronizes the rotations of the plurality of crankshafts 3 are provided as main components.

<Housing>
In the present embodiment, the housing 4 is formed in a substantially rectangular box shape, and a housing hole 7 for housing the orbiting wrap 6 of the orbiting scroll 2 so as to be capable of orbiting is axially provided in a central portion in a plan view (vertical direction in FIG. 2). Is formed so as to penetrate through. In the housing 4, the crankshaft 3 is provided at a plurality of circumferential positions surrounding the accommodation hole 7 in parallel with the axis of the accommodation hole 7, and the accommodation space 9 of the eccentric shaft portion 8 of the crankshaft 3 is accommodated in the accommodation hole. 7 through the opening 10.

The housing 4 of the present embodiment includes a substantially rectangular flat plate-shaped first outer plate 11 and a second outer plate 12, which are formed in sizes corresponding to each other. The first outer plate 11 and the second outer plate 12 are arranged so as to be spaced apart from each other in the axial direction and face each other in parallel, and the outer end sides thereof are connected by an appropriate connecting plate 13. As shown in FIG. 2, when the scroll fluid machine 1 is arranged with the axial direction of the crankshaft 3 oriented in the vertical direction, the first outer plate 11 is an upper plate and the second outer plate 12 is a lower plate. When the scroll fluid machine 1 is arranged with the axial direction of the crankshaft 3 oriented in the left-right direction, the first outer plate 11 and the second outer plate 12 are side plates. Similarly, the connection plate 13 becomes a side plate when the scroll fluid machine 1 is placed vertically, and becomes an upper plate or a lower plate when placed horizontally.

Opening holes 7A are formed through the first outer plate 11 and the second outer plate 12 as corresponding openings of the accommodation holes 7 at corresponding positions. The opening of the accommodation hole 7 can also be said to be the opening of the hollow portion in the housing 4. The opening hole 7A of the first outer plate 11 and the opening hole 7A of the second outer plate 12 are circular holes of the same size. In the example shown in FIG. 2, the peripheral wall of the upper opening hole 7A projects below the lower surface of the first outer plate 11, and the peripheral wall of the lower opening hole 7A extends above the upper surface of the second outer plate 12. Protruding to.

An annular flange 15 is formed at the bottom of each opening 7A. Specifically, a flange 15 is provided at the inner end (lower end) of the peripheral wall of the opening hole 7A on one side (upper side) in the axial direction so as to extend radially inward, while the other side in the thickness direction (lower side). A flange 15 is provided at an inner end (upper end) of the peripheral wall of the opening hole 7A of FIG. An annular hollow portion is formed inside the housing 4 outside the respective flanges 15 in the radial direction, and the hollow portion serves as a housing space 9 for the eccentric shaft portion 8 of the crankshaft 3. The accommodation space 9 is a cavity in which the accommodation hole 7 (opening holes 7A on both sides (upper and lower sides) and the space between them are virtually connected continuously along the circumferential direction through the opening 10 between the pair of flanges 15. Part).

Note that the first outer plate 11 and the second outer plate 12 have a lower surface of the first outer plate 11 and an upper surface of the second outer plate 12 as in the front and rear edges (that is, the right side of FIG. 2) of FIG. May be connected by a connecting plate 13, or the end face of the first outer plate 11 and the end face of the second outer plate 12 may be connected like the left and right edges of FIG. 1 (that is, the left side of FIG. 2). You may connect with the board 13. Further, each connecting plate 13 may be provided in the entire area of the end sides of the first outer plate 11 and the second outer plate 12 like the connecting plate 13 on the right side in FIG. 1, or the connecting plate on the left side in FIG. As in 13, it may be provided on a part of the end sides of the first outer plate 11 and the second outer plate 12. The plates 11 to 13 are removably assembled by using the bolts 14, so that the first outer plate 11 can be removed from the connection plates 13, for example. Note that the bolt 14 is not limited to the literal bolt, and various screws may be used, and the same applies to other bolts described later.

<Turning scroll>
As shown in FIGS. 2 and 3, the orbiting scroll 2 includes an orbiting scroll main body 17 having an orbiting side base plate portion 16 and an orbiting wrap 6, and an orbiting scroll base 18 to which the crankshaft 3 is connected, as main components. Prepare

<Orbiting scroll body>
The orbiting scroll main body 17 is detachably attached from one surface (the surface on the upper side of the drawing) of the orbiting scroll base 18 to a receiving hole 19 formed in the central portion. The orbiting scroll main body 17 is provided with the orbiting wraps 6 on both side surfaces (upper surface and lower surface) of the disk-shaped orbiting side substrate portion 16.

The swirl wrap 6 is a plate-shaped member that extends vertically from the plate surface of the swirl-side substrate unit 16, and is curved in a spiral shape of an involute curve from the central portion of the swirl-side substrate unit 16 toward the outer peripheral portion 70. To be done. The swirl wrap 6 provided on one side surface (upper surface) of the swirl side substrate portion 16 faces one side (upper side) in the axial direction, and the swirl wrap 6 provided on the other side surface (lower surface) is the other side in the axial direction. The swivel wraps 6 facing downward (downward) and having upper and lower sides (both sides) are formed so that their shapes, sizes, and arrangements correspond to each other.

A tip seal 21 for filling a gap between the fixed scroll 5 and the fixed-side substrate portion 20 is provided at the tip of each orbiting wrap 6. The tip seal 21 is arranged along the spiral of the swivel wrap 6. The tip seal 21 of the present embodiment is fitted into a groove formed in the tip end portion of the turning wrap 6 extending from the turning side base plate portion 16. In the drawing, the upper end portion of the upper turning wrap 6 and the lower end portion of the lower turning wrap 6 are extended tip portions. The tip seal 21 is attachable to and detachable from the turning wrap 6. 3 and 5, the tip seal 21 and its related structure are not shown.

A plurality of extension pieces 22 extending outward in the radial direction are provided on the outer peripheral portion 70 of the turning side substrate portion 16. The outer peripheral portion 70 of the present embodiment is an area up to the end surface (outermost peripheral side) on the outer side in the radial direction of the plate surface of the revolving-side substrate portion 16 where the swirl wrap 6 is provided, and is the outermost portion in the radial direction. The range includes the part.

A plurality of extending pieces 22 are provided at intervals in the circumferential direction. In the present embodiment, a pair of extension pieces 22 arranged adjacent to each other is set as a set, and a plurality of this set is provided at equal intervals in the circumferential direction. Specifically, the pair of extension pieces 22 are integrally formed with the central portion of the turning side substrate portion 16 at three sets and at intervals of 120 degrees. In the present embodiment, the extension piece 22 constitutes a part of the outer peripheral portion 70. The swivel side substrate portion 16 can be changed in shape as appropriate, and the extending piece 22 can be omitted to form a circular shape, a polygonal shape, or the like. In this case as well, the outer peripheral portion is a region up to the end surface (outermost peripheral side) on the outer side in the radial direction than the portion where the turning wrap is provided.

Each extension piece 22 of the present embodiment has one side surface (upper surface) in the thickness direction formed in a continuous plate shape from the center of the turning side substrate portion 16. As shown on the right side of FIG. 2, the extension piece 22 is formed so that the thickness thereof is slightly smaller than that of the central portion of the turning side base plate portion 16.

A notch 71 having a shape corresponding to the outer shape of a bearing 80 of the orbiting scroll base 18, which will be described later, is provided on the outer peripheral portion 70 of the orbiting side substrate 16. The notch portions 71 are arranged at equal intervals in the circumferential direction, and are formed in a substantially arc shape from the outer end surface to the inner side in the radial direction. In the present embodiment, the cutout portion 71 is formed between the pair of extending pieces 22 forming the outer peripheral portion 70.

As shown in FIG. 3, two bolt insertion holes 23 are vertically formed on the plate surface of each extension piece 22 so as to be separated from each other in the circumferential direction of the turning side base plate portion 16. Further, a pin hole 25 into which a lock pin 24, which will be described later, is fitted is also formed in the two extending pieces 22 so as to face each other in the substantially radial direction of the turning side base plate portion 16.

<Orbiting scroll base>
The orbiting scroll base 18 is formed at its center with a receiving hole 19 for receiving the orbiting side base plate portion 16 of the orbiting scroll body 17, and has an overall ring shape. On the outer peripheral portion of the orbiting scroll base 18, bearing portions 80 that connect the crankshaft 3 are arranged at equal intervals in the circumferential direction. A bearing hole 33 is formed through each bearing portion 80. Each bearing hole 33 is a stepped hole in which a large diameter hole 33a is arranged in the upper part and a small diameter hole 33b is arranged in the lower part. The bearing portion 80 can also be referred to as a thickness portion that surrounds the bearing hole 33.

The orbiting scroll base 18 of the present embodiment is formed in a substantially triangular shape with rounded corners in a plan view, and bearing portions 80 are arranged at the three corners. The shape of the orbiting scroll base 18 is not limited to a substantially triangular shape in a plan view, and can be appropriately changed to a substantially circular shape or the like.

Around the receiving hole 19 of the orbiting scroll base 18 (inner peripheral portion), recesses 26 for receiving the extending pieces 22 of the orbiting scroll body 17 are provided on both sides in the circumferential direction of each bearing portion 80. The recess 26 is formed by cutting out the inner peripheral wall of the receiving hole 19 from one side in the thickness direction, and one side in the thickness direction (so that the bottom surface thereof is located at the axial center of the receiving hole 19). (Upward).

Screw holes 27 corresponding to the bolt insertion holes 23 formed in the extension piece 22 of the orbiting scroll body 17 are formed on the bottom surface of each recess 26. Further, lock pins 24 are provided on the bottom surface of the recessed portion 26 so as to project to one side in the axial direction from the bottom surface, at two locations facing each other in the substantially radial direction of the receiving hole 19.

Further, as shown in FIG. 2, swivel bearings 29 are provided at the three corners of the orbiting scroll base 18 in order to hold the orbiting scroll base 18 on the eccentric shaft portion 8 of the crankshaft 3, respectively. From the viewpoint of protecting the orbiting bearing 29 (more specifically, preventing running out of grease), it is preferable to prevent heat transfer from the orbiting scroll body 17 to the orbiting scroll base 18. In the present embodiment, the inner diameter of the receiving hole 19 is configured to be larger than the outer diameter of the turning-side base plate portion 16 by the set dimension. As a result, when the orbiting scroll body 17 is fitted into the receiving hole 19 of the orbiting scroll base 18, a gap is formed between the outer peripheral surface of the orbiting side base plate portion 16 and the inner peripheral surface of the receiving hole 19, and the orbiting scroll body is provided. It is possible to prevent heat transfer from 17 to the orbiting scroll base 18.

<Fixed scroll>
The fixed scrolls 5 are arranged on both axial sides (up and down in FIG. 2) of the orbiting scroll 2. Each fixed scroll 5 is provided with one or a plurality of plate-shaped fixed wraps 50 on one surface of the disk-shaped fixed-side substrate portion 20 and perpendicular to the plate surface. In FIG. 2, the fixed scroll 5 on the upper side is provided with a fixed wrap 50 on the lower surface of the fixed-side substrate portion 20 downward, and the fixed scroll 5 on the lower side is provided on the upper surface of the fixed-side substrate portion 20. A fixed wrap 50 is provided upward.

The fixed wraps 50 are provided in the number, shape, and size corresponding to the swivel wraps 6, and are configured to be curved in a spiral of an involute curve from the central portion of the fixed-side substrate portion 20 toward the outer peripheral portion.

At the tip of the fixed wrap 50, a tip seal 51 for filling a gap with the orbiting side substrate portion 16 of the orbiting scroll 2 is provided. The tip seal 51 is arranged along the spiral of the fixed wrap 50. The tip seal 51 of the present embodiment is fitted into a groove formed in the tip portion of the fixed wrap 50 extending from the fixed-side substrate portion 20. In the drawing, the lower end portion of the fixed wrap 50 of the upper fixed scroll 5 and the upper end portion of the fixed wrap 50 of the lower fixed scroll 5 are extended tip portions. The tip seal 51 is attachable to and detachable from the fixed wrap 50.

Each fixed scroll 5 is provided with a cylindrical outer peripheral wrap 52 so as to surround the fixed wrap 50. In the drawing of FIG. 2, the fixed scroll 5 on the upper side is provided with an outer peripheral wrap 52 on the lower surface of the fixed side substrate section 20, and the fixed scroll 5 on the lower side is the upper surface of the fixed side substrate section 20. An outer peripheral wrap 52 is provided upward. The height of the outer peripheral wrap 52 (extending dimension from the fixed side substrate section 20) substantially corresponds to the height of the fixing wrap 50 (extending dimension from the fixed side substrate section 20).

An outer peripheral seal 52A is provided at the tip of the outer peripheral wrap 52 as a dust seal for filling a gap between the orbiting scroll 2 and the orbiting side substrate portion 16. One or more outer peripheral seals 52A are arranged along the circumferential direction of the outer peripheral wrap 52.

The outer peripheral seal 52A of the present embodiment is fitted into a groove formed in the tip portion of the outer peripheral wrap 52 extending from the fixed-side substrate portion 20. In the drawing, the lower end portion of the outer peripheral wrap 52 of the upper fixed scroll 5 and the upper end portion of the outer peripheral wrap 52 of the lower fixed scroll 5 are extended tip portions. The outer peripheral seal 52A is configured to be attachable to and detachable from the outer peripheral wrap 52.

Each fixed scroll 5 is detachably provided above and below the housing 4 in a state where the fixed wrap 50 is engaged with the orbiting wrap 6. Specifically, the upper fixed scroll 5 is detachably fixed with bolts 53 by overlapping the outer peripheral portion of the fixed side substrate 20 on the upper surface of the upper flange 15 of the housing 4. Further, the lower fixed scroll 5 is detachably fixed by bolts 53 by superposing the outer peripheral portion of the fixed side substrate portion 20 on the lower surface of the lower flange 15 of the housing 4. The flange 15 of the housing 4 is provided with lock pins 55 at a plurality of positions in the circumferential direction, and the lock pins 55 are fitted into the pin holes provided in the fixed side base plate portion 20 of the fixed scroll 5 to make the housing 4 The fixed scroll 5 is positioned in the circumferential direction with respect to.

As shown in FIGS. 1 and 2, the pair of fixed scrolls 5 are each provided with a first opening 60 on the outer peripheral side and a second opening 61 in the central portion. In addition, pipe-shaped opening members 62 and 63 are attached to the first opening 60 and the second opening 61. In addition, in FIG. 2, the second openings 61 shown at the top and bottom may be communicated with each other by opening a through hole in the center of the orbiting side substrate portion 16 of the orbiting scroll 2 depending on the case.

<Crankshaft>
The crankshaft 3 is provided in at least two places, preferably three or more places, on the outer peripheral portion of the orbiting scroll 2 (orbiting scroll base 18). In the present embodiment, the crankshafts 3 are provided on the outer peripheral portion of the orbiting scroll 2 at three locations at equal intervals in the circumferential direction.

As shown in FIG. 1, the crankshafts 3 are provided at three equal intervals in the circumferential direction of the housing 4, and have the same structure in this embodiment. Further, as shown in FIG. 2, each crankshaft 3 is arranged with its axis line in the vertical direction. Each crankshaft 3 is provided so as to vertically pass through a hollow portion of the housing 4 in the drawing.

As shown in FIG. 2 (particularly on the left side) and FIG. 4, in each crankshaft 3, an eccentric shaft portion 8 is eccentrically provided between main shaft portions 34 and 35 arranged on the same axis. In the present embodiment, the lower main shaft portion 35 gradually decreases in diameter as it goes downward, and is divided into a large diameter portion 35a, a medium diameter portion 35b, and a small diameter portion 35c. Further, a diametrically expanded portion 8a is concentrically formed at the lower end of the eccentric shaft portion 8.

Each crankshaft 3 is provided with a weight balancer 49 for smooth rotation of the orbiting scroll 2. In the present embodiment, weight balancers 49 are provided at the lower end of the upper spindle portion 34 and the upper end of the large diameter portion 35a of the lower spindle portion 35, respectively.

The crankshafts 3 are rotatably held by the first outer plate 11 and the second outer plate 12 of the housing 4 at the main shaft portions 34 and 35 on both sides of the eccentric shaft portion 8 therebetween. In the present embodiment, the upper main shaft portion 34 is rotatably held by the first outer plate 11 of the housing 4 via the first bearing 36, and the middle diameter portion 35b of the lower main shaft portion 35 is the second bearing 37. It is rotatably held by the second outer plate 12 of the housing 4 via.

In each crankshaft 3, of the main shaft portions 34, 35 on both sides of the eccentric shaft portion 8, one main shaft portion (lower main shaft portion in FIG. 2) 35 has a first step portion 3 a at an axially intermediate portion. Is provided. The lower main shaft portion 35 in the drawing is formed in a stepped rod shape as described above, and the stepped portion (the lower surface of the large diameter portion 35a) between the large diameter portion 35a and the medium diameter portion 35b is the first stepped portion 3a. To be done. The upper end surface of the inner ring of the second bearing 37 is brought into contact with the first step portion 3a.

Each crankshaft 3 is provided with a second step portion 3b at one axial end (lower end in FIG. 2) of the eccentric shaft portion 8 in the axial direction. As described above, the eccentric shaft portion 8 is provided with the expanded diameter portion 8a at the lower end, and the stepped portion (the upper surface of the expanded diameter portion 8a) between the expanded diameter portion 8a and the expanded diameter portion 8a is the second step portion 3b. It is said that The lower end surface of the inner ring of the slewing bearing 29 is brought into contact with the second step portion 3b. The eccentric shaft portion 8 may be provided with a single or a plurality of swivel bearings 29. In the case of plural swivel bearings 29, the lower end surface of the inner ring of the swivel bearing 29 arranged at the lowest position is brought into contact with the second step portion 3b. .. In the example shown in the drawings, two slewing bearings 29 are vertically stacked and installed on the eccentric shaft portion 8.

The first outer plate 11 and the second outer plate 12 of the housing 4 have shaft mounting holes 38 and 39 penetrating vertically at three positions in the circumferential direction corresponding to the installation position of the crankshaft 3. The shaft mounting hole 38 of the first outer plate 11 of the housing 4 is formed as a stepped hole, and a small diameter hole 38a is formed below and a large diameter hole 38b is formed above. The shaft mounting hole 39 of the second outer plate 12 of the housing 4 is also formed as a stepped hole, and a small diameter hole 39a is formed above and a large diameter hole 39b is formed below.

In the present embodiment, both the first bearing 36 and the second bearing 37 are rolling bearings. As is well known, the rolling bearing is configured by arranging a large number of rolling elements arranged in a circumferential direction between a substantially cylindrical inner ring and an outer ring which are arranged concentrically. As a result, in the rolling bearing, the inner ring and the outer ring are rotatable via the rolling elements. It should be noted that the orbiting bearings 29 provided on the eccentric shaft portion 8 also have the same configuration as the first bearing 36 and the second bearing 37 in the present embodiment.

The fixing of the second bearing 37 to the second outer plate 12 of the housing 4 is performed as follows. That is, until the upper end surface of the outer ring contacts the stepped portion (the upper surface of the large diameter hole 39b) of the small diameter hole 39a and the large diameter hole 39b of the shaft mounting hole 39 of the second outer plate 12, the large diameter hole 39b is first 2 The outer ring of the bearing 37 is press-fitted. Then, the annular retaining ring 40 is superposed on the lower surface of the second outer plate 12 and is fixed by the bolts 41. As a result, in the second bearing 37, the outer ring is fixed by being sandwiched between the stepped portion of the shaft mounting hole 39 and the retaining ring 40.

The middle diameter portion 35b of the lower main shaft portion 35 is press-fitted into the inner ring of the second bearing 37. That is, the middle diameter portion 35b of the main shaft portion 35 is press-fitted into the inner ring of the second bearing 37 until the upper end surface of the inner ring of the second bearing 37 contacts the first step portion 3a. Since the lower end of the medium diameter portion 35b is a threaded portion, the first retaining nut 42 is screwed into the threaded portion. As a result, the inner ring of the second bearing 37 is sandwiched and fixed between the first step portion 3 a and the retaining nut 42.

The first bearing 36 is fixed to the first outer plate 11 of the housing 4 as follows. That is, the outer ring of the first bearing 36 is held by the bearing case 43, and the bearing case 43 is fitted into the large diameter hole 38b until the lower end surface of the flange of the bearing case 43 contacts the upper surface of the first outer plate 11. Then, the flange of the bearing case 43 is fixed to the upper surface of the first outer plate 11 with bolts 44. On the other hand, the upper main shaft portion 34 is press-fitted into the inner ring of the first bearing 36.

<Rotation synchronization mechanism>
The three crankshafts 3 are synchronously rotated by the rotation synchronization mechanism 45 by aligning the positions of the eccentric shaft portions 8 (that is, aligning the phases). Although the rotation synchronization mechanism 45 may use a gear, a timing belt 46 is used in this embodiment.

In the rotation synchronization mechanism 45 of the present embodiment, toothed pulleys 47 are fixed to the main shaft portion 35 (small diameter portion 35c) below each crankshaft 3, and a timing belt 46 hangs between these toothed pulleys 47. It has been turned. At this time, as shown in FIG. 1, the timing belt 46 is also hooked on the tension roller 48, and by adjusting the position of the tension roller 48 (the position of the accommodation hole 7 in the radial direction), The tension can be adjusted.

One of the three crankshafts 3 (the lower right crankshaft in FIG. 1 in the present embodiment) is a drive crankshaft into which supply power is input from outside (or recovery power is output to outside). 3A, and the other two are driven crankshafts 3B that do not directly perform such input (or output).

<Assembly of scroll fluid machine>
An example of the assembling work of the scroll fluid machine 1 of the present embodiment will be described. First, the connection between the orbiting scroll base 18 and the orbiting scroll body 17 will be described. The extension piece 22 of the orbiting scroll body 17 is fitted into the recess 26 of the orbiting scroll base 18, while the orbiting side base plate portion 16 of the orbiting scroll body 17 is fitted into the receiving hole 19 of the orbiting scroll base 18. By fitting the pin hole 25 of the extension piece 22 of the orbiting scroll body 17 into the lock pin 24 of the recess 26 of the orbiting scroll base 18, the orbiting scroll body 17 is positioned in the circumferential direction with respect to the orbiting scroll base 18.

As shown in FIG. 5, when the orbiting scroll base 18 and the orbiting scroll body 17 are being positioned, the bearing portion 80 of the orbiting scroll base 18 enters the inside of the cutout portion 71 of the orbiting scroll body 17. Become. The two-dot chain line shown in FIG. 5 is a virtual arc that connects the end faces of the pair of extension pieces 22, but a part of the bearing portion 80 has a positional relationship related to this arc. In this state, the bolts 28 are inserted into the bolt insertion holes 23 of the extending pieces 22 on both sides that sandwich the bearing 80, and are screwed into the screw holes 27 of the recess 26.

In order to fix the orbiting scroll main body 17 to the orbiting scroll base 18, it is necessary to form a space for fastening the bolt 28 such as the extension piece 22 on the outer peripheral portion 70 of the orbiting side substrate portion 16. In the present embodiment, the space for connecting the orbiting scroll main body 17 to the orbiting scroll base 18 is orbited by forming the notch 71 between the pair of extending pieces 22 as a space for sandwiching the bearing portion 80 of the orbiting scroll base 18. A layout is realized in which the bearing portion 80 of the orbiting scroll base 18 is arranged on the inner side in the radial direction while being formed on the outer peripheral portion 70 of the side substrate portion 16. In other words, the bearing portion 80 is arranged in the outer peripheral portion 70 of the turning side base plate portion 16 so as to pass the locus of the virtual circle passing through the fastening portion in the circumferential direction, and the notch portion is avoided while avoiding the fastening portion of the outer peripheral portion 70. It can be said that 71 is arranged.

Since the orbiting scroll base 18 and the orbiting scroll body 17 can be separated by removing the bolt 28, the orbiting scroll body 17 is detachably fixed to the orbiting scroll base 18. The lock pin 24 and the pin hole 25 can be omitted. Next, an operation of rotatably attaching the orbiting scroll 2 to the housing 4 via the crankshaft 3 will be described. First, the second bearing 37 is attached to the second outer plate 12. On the other hand, each crankshaft 3 is attached to the orbiting scroll 2 via an orbiting bearing 29 and a biasing member 57 described later. The orbiting scroll 2 is held by the crankshaft 3 via an orbiting bearing 29 attached to the bearing hole 33. The orbiting scroll 2 is in a state in which the orbiting side base plate portion 16 and the orbiting scroll base 18 are arranged perpendicularly to the axis of the accommodation hole 7 in a state where the orbiting wrap 6 is disposed in the accommodation hole 7 of the housing 4. The orbiting scroll base 18 extends outward from the accommodation hole 7 through the opening 10 between the flanges 15 of the housing 4. The bearing holes 33 of the orbiting scroll base 18 are in a positional relationship of being arranged radially outward of the flange 15 of the housing 4.

Next, the crankshafts 3 of the orbiting scroll 2 are fitted and attached to the second bearings 37 of the second outer plate 12. At this time, each crankshaft 3 is attached in a predetermined posture. In the present embodiment, the eccentric shaft portion 8 is attached in a position-matched state with no phase difference. After that, when the first outer plate 11 is attached, the first bearing 36 is arranged between the first outer plate 11 and the crankshaft 3. The fixed scroll 5 is fixed to the opening holes 7A of the first outer plate 11 and the second outer plate 12.

As described above, in the scroll fluid machine 1 of the present embodiment, the orbiting scroll 2 has the orbiting wrap 6 arranged in the accommodation hole 7 of the housing 4, and is rotatably held in the housing 4 outside the accommodation hole 7. It On the other hand, the fixed scroll 5 is detachably provided on the flange 15 of the housing hole 7 so that the fixed wrap 50 is arranged in the housing hole 7 of the housing 4 and the housing hole 7 of the housing 4 is closed. At that time, the fixed-side substrate portion 20 of the fixed scroll 5 is also housed in the housing hole 7, whereby a compact structure can be achieved.

Next, a case where the scroll fluid machine 1 of the present embodiment is used as a compressor or a blower and a case where it is used as an expander will be described.

<Scroll fluid machine as compressor or blower>
When the scroll fluid machine 1 is a compressor or a blower, the drive crankshaft 3A may be rotated (that is, power is input). Supply power is externally applied to the drive crankshaft 3A (that is, power is input), and accordingly, the orbiting scroll 2 is orbited while the driven crankshaft 3B is also rotated via the rotation synchronization mechanism 45. For example, an output shaft of a motor (not shown) is directly connected to one main shaft portion 35 of the drive crank shaft 3A, that is, connected via a coupling.

Thereby, the orbiting scroll 2 can be orbited with respect to the fixed scroll 5. At this time, the power supplied to the drive crankshaft 3A is also transmitted to the driven crankshaft 3B via the rotation synchronization mechanism 45, and the three crankshafts 3 rotate synchronously. When the orbiting scroll 2 is orbited with respect to the fixed scroll 5, the fluid is sucked from the first opening 60, and the fluid is compressed between the orbiting wrap 6 and the fixed wrap 50, while the outer end side to the inner end of the spiral. It can be moved to the side and discharged from the second opening 61.

<Scroll fluid machine as expander>
When the scroll fluid machine 1 is an expander, the orbiting scroll 2 is orbited (rotated) by the supplied fluid, and each crankshaft 3 is rotated through the rotation synchronization mechanism 45, so that recovery power is given to the drive crankshaft 3A. (That is, power is output). Rotational driving force is applied to drive crankshaft 3A (that is, power is output). For example, an input shaft of a driven machine (a machine driven by an expander) is directly connected to the drive crankshaft 3A, that is, connected via a coupling.

Then, when the fluid is made to flow in from the second opening 61, the orbiting scroll 2 orbits by the force of the fluid, and the fluid is discharged from the first opening 60 while expanding. As a result, the rotational driving force of the orbiting scroll 2 can be taken out from the driving crankshaft 3A as the recovery power. At this time, the driven crankshaft 3B also rotates synchronously with the drive crankshaft 3A via the rotation synchronization mechanism 45.

In addition, the scroll fluid machine 1 of the present embodiment may be used by rotating the drive crankshaft 3A in the opposite direction by the motor, sucking the fluid from the second opening 61, and discharging the fluid to the first opening 60. ..

In this way, the scroll fluid machine 1 of this embodiment can be used as a compressor, an expander, a blower, a vacuum pump, or the like. The fluid to be compressed or expanded is not particularly limited, and various fluids such as air, steam, and refrigerant can be used.

According to the embodiment described above, the following effects are achieved.
That is, in the scroll fluid machine 1, the fixed scroll 5 in which the spiral-shaped fixed wrap 50 is provided on the plate surface of the fixed-side base plate portion 20 and the spiral-shaped swirl wrap that meshes with the fixed wrap 50 on the plate surface of the swirl-side base plate portion 16 are included. 6 is provided, and the orbiting scroll main body 17 is provided with a plurality of notches 71 extending inward in the radial direction from the end surface of the outer peripheral portion 70 of the orbiting side substrate portion 16, and the orbiting scroll via bolts 28 that pass through the outer peripheral portion 70. While the main body 17 is being fixed, the orbiting scroll base 18 in which a plurality of bearing portions 80 are provided corresponding to the cutout portions 71 and which are inserted into the inside of the cutout portion 71 with the orbiting scroll main body 17 fixed is inserted into the bearing portion 80. And a plurality of crankshafts 3 provided with the eccentric shaft portion 8.

Accordingly, the bearing portion 80 of the orbiting scroll base 18 can be positioned inside in the radial direction by the cutout portion 71 of the orbiting scroll body 17, so that the orbiting scroll base 18 can be designed to have a small radial size. It is also possible to downsize the housing 4 that houses the orbiting scroll base 18.
Moreover, since the fixed scroll 5 can be easily removed from the housing 4 without disconnecting the bearing 80 of the orbiting scroll 2 and the crankshaft 3 from the housing 4, it is possible to replace the parts due to surface treatment or materials. It is possible to easily perform reprocessing, removal of foreign matter from being caught, and internal cleaning. For example, the tip seal 21 of the swivel wrap 6, the tip seal 51 of the fixed wrap 50, and the outer peripheral seal 52A of the outer peripheral wrap 52 can be easily replaced.

Further, in the present embodiment, the orbiting scroll base 18 is provided with a plurality of extending pieces 22 extending outward in the radial direction and through which the bolts 28 are inserted, at intervals in the circumferential direction. The recessed part 26 which accommodates the extension piece 22 is provided in it, and the notch 71 is located between the adjacent extension pieces 22.

Accordingly, it is possible to realize a configuration in which the bearing portion 80 is inserted inside the orbiting scroll body 17 in the radial direction while ensuring a space for fastening the bolt 28 by the extension piece 22.
Also, a gap may be formed between the outer peripheral surface of the orbiting side substrate portion 16 and the inner peripheral surface of the receiving hole 19 to prevent heat transfer from the orbiting scroll body 17 to the orbiting scroll base 18. realizable. In this structure in which a gap is formed, it is possible in some cases to form the bearing portion 80 by cutting the notch 71 inward in the radial direction by the gap. That is, it is possible to achieve both the structure of protecting the orbiting bearing 29 while realizing downsizing of the entire orbiting scroll 2 in the radial direction.

Further, in the present embodiment, the orbiting scroll body 17 is provided with the orbiting wraps 6 on both sides of the orbiting side base plate portion 16, the pair of fixed scrolls 5 is provided on both sides of the orbiting side base plate portion 16, and the orbiting scroll base 18 is The orbiting scroll main body 17 can be attached to and detached from the receiving hole 19 provided in the central portion from one side.

As a result, the orbiting scroll main body 17 having the orbiting wraps 6 provided on both sides can be attached and detached from one side of the orbiting scroll base 18 at once, so that the attachment and detachment work at the time of maintenance is easy and the work time can be shortened. In the present embodiment, although some disassembly of the housing 4 at the first bearing 36 is required, the orbiting scroll body 17 can be removed upward from the orbiting scroll base 18 without disassembling at the orbiting bearing 29. .. Therefore, like the fixed scroll 5, maintenance of the orbiting scroll body 17 can be easily performed.

Further, the scroll fluid machine 1 of the present embodiment is also configured as follows.

<Structure with turning wraps on both sides>
In the scroll fluid machine 1 of the present embodiment, the orbiting scroll main body 17 in which the orbiting scroll bases 16 are provided with the spiral orbiting wraps 6 can be attached to and detached from one side of the orbiting scroll base 18 to the receiving hole 19 in the central portion. And a spiral fixed wrap 50 provided on one surface of the fixed-side base plate portion 20. The fixed wrap 50 is engaged with the orbiting wrap 6 to sandwich the orbiting scroll 2 therebetween. The pair of fixed scrolls 5 and the orbiting scroll base 18, which are provided at a plurality of positions in the circumferential direction of the orbiting scroll base 18, rotate the eccentric shaft portion 8 held via the orbiting bearing 29 in synchronism with each other. A plurality of crankshafts 3 that orbit the orbiting scroll 2 with respect to the scroll 5.

When the orbiting scroll body 17 can be attached to and detached from the orbiting scroll base 18, it is more preferable that the orbiting scroll body 17 can be attached to and detached from the orbiting scroll base 18 through the accommodation hole 7 of the housing 4. In that case, the outer diameter of the orbiting-side substrate portion 16 of the orbiting scroll body 17 is formed to be smaller than the inner diameter of the housing hole 7 of the housing 4 and further the inner diameter of the flange 15 of the housing hole 7. Therefore, after removing the fixed scroll 5 from the housing 4, the orbiting scroll body 17 can be further removed from the orbiting scroll base 18. Moreover, the work can be performed through the accommodation hole 7 of the housing 4 and is not attached or detached at any bearing portion 80, so that workability is further improved.

<Positioning with a set screw>
Further, when the orbiting side substrate portion 16 of the orbiting scroll body 17 is fitted into the receiving hole 19 of the orbiting scroll base 18 with a gap, the radial positioning of the orbiting scroll body 17 with respect to the orbiting scroll base 18 is performed as follows. It is preferable to carry out. That is, the peripheral wall of the receiving hole 19 is provided with the support member (31) at three or more positions in the circumferential direction, preferably at equal intervals in the circumferential direction, with the tips protruding into the receiving hole 19. In the present embodiment, the orbiting scroll base 18 having a substantially triangular shape is formed with a threaded hole 32 in each central portion of the three end sides so as to penetrate in the radial direction, and the threaded hole 31 has a set screw 31 as a support material. (For example, a hexagon socket set screw) is screwed in. The tip of the set screw 31 projects inward from the peripheral side wall of the receiving hole 19. By holding (chucking) the orbiting-side substrate portion 16 with the tip end portion of the set screw 31 by contacting the outer peripheral portion of the orbiting-side substrate portion 16 of the orbiting scroll main body 17, the orbiting-side substrate portion 16 with respect to the receiving hole 19 is provided. Radial positioning can be performed. By advancing and retracting the set screw 31 with respect to the screw hole 32, the position of the turning side substrate portion 16 with respect to the receiving hole 19 can be adjusted. If desired, the set screw 31 may be fixed to the orbiting scroll base 18 with an adhesive. After the position of the orbiting side substrate portion 16 with respect to the receiving hole 19 is fixed by the set screw 31, the position of the setting screw 31 is fixed, and the orbiting scroll main body 17 is set in the axial direction (the plate surface of the orbiting side substrate portion 16 with respect to the orbiting scroll base 18. Can be attached and detached in the vertical direction). In order to prevent heat transfer from the orbiting scroll main body 17 to the orbiting scroll base 18, the set screw 31 is also preferably made of a material having a lower thermal conductivity than that of the orbiting scroll base 18, and is made of stainless steel in this embodiment. Has been done. When adopting such a configuration, the lock pin 24 and the pin hole 25 described above are configured to be fitted by a clearance fit.

<Biasing member>
Further, according to the scroll fluid machine 1 of the present embodiment, in all the eccentric shaft portions 8 of the crankshafts 3, an annular urging member is provided in the gap between the outer ring of the orbiting bearing 29 and the bearing hole 33 of the orbiting scroll 2. 57 is provided. This prevents the gap between the outer ring of the orbiting bearing 29 and the bearing hole 33 of the orbiting scroll 2 from being filled even if the orbiting scroll 2 shakes with respect to the crankshaft 3 due to centrifugal force during orbiting of the orbiting scroll 2. The gap Y between the side surfaces of the fixed wrap 50 and the swivel wrap 6 can be maintained as desired.

For example, as shown in the left half of FIG. 2, in a state where the eccentric shaft portion 8 of the crankshaft 3 is arranged on the leftmost side, the orbiting scroll 2 swings to the left side due to centrifugal force, and the eccentric shaft portion 8 rotates to the right side. On the side surface, a load is applied so as to fill the fitting gap X of the orbiting bearing 29, and the fixed wrap 50 and the orbiting wrap 6 tend to come close to each other. However, by supporting the load by the biasing member 57, it is possible to suppress the gap X between the outer ring of the orbiting bearing 29 and the bearing hole 33 of the orbiting scroll 2 from being filled, and to prevent the gap between the side surfaces of the fixed wrap 50 and the orbiting wrap 6 from being filled. The gap Y can be maintained at a desired value. Further, even if the gap X between the outer ring of the orbiting bearing 29 and the bearing hole 33 of the orbiting scroll 2 is completely filled, the impact is mitigated by the action of the biasing member 57 to prevent the wraps 50 and 6 from being damaged. be able to. Such an action can be sequentially and continuously achieved along the circumferential direction of the crankshaft 3 as the orbiting scroll 2 orbits. Since the gap Y between the laps 50 and 6 can be automatically adjusted in this way, the machining accuracy and the assembly accuracy of each component can be relaxed more than before. Furthermore, since the gap Y between the laps 50 and 6 can be automatically adjusted, the performance of the scroll fluid machine 1 can be stabilized.

<Axial positioning structure of crankshaft>
Further, according to the scroll fluid machine 1 of the present embodiment, the crankshaft 3 is provided with the first step portion 3a and the second step portion 3b, and the first step portion 3a is used for positioning to the fixed scroll 5 side. By using the two-step portion 3b for positioning on the side of the orbiting scroll 2, it becomes easy to position each scroll 2, 5 in the axial direction of each crankshaft 3. In other words, by assembling each member with the bearing contact surface (the stepped portion that abuts the upper end surface of the second bearing 37) of the second outer plate 12 of the housing 4 that holds the fixed scroll 5 as a reference, Therefore, the axial position of the orbiting scroll 2 is determined. Moreover, in the slewing bearing 29 provided on the eccentric shaft portion 8, the inner ring is fixed to the eccentric shaft portion 8, but the outer ring is not fixed to the bearing hole 33, so that the radial gap Y between the laps 50 and 6 described above. It does not interfere with the adjustment function of.

<Crankshaft orbiting scroll holding structure>
As shown in FIGS. 2 and 4, the inner ring of the slewing bearing 29 is press-fitted and fixed to the eccentric shaft portion 8 of the crankshaft 3. In this embodiment, the two swivel bearings 29 are vertically stacked and press-fitted into the eccentric shaft portion 8. At that time, the lower end surface of the inner ring of the lower slewing bearing 29 is brought into contact with the second step portion 3b. Since the upper end portion of the eccentric shaft portion 8 is a screw portion, the second retaining nut 56 is screwed into the screw portion. As a result, in the slewing bearing 29, the inner ring is sandwiched and fixed between the second step portion 3b and the retaining nut 56.

On the other hand, a slight gap is formed between the outer ring of the orbiting bearing 29 and the bearing hole 33 (large diameter hole 33a) of the orbiting scroll 2, and an annular urging member 57 is provided in the gap. The biasing member 57 may be an elastic ring (for example, an O-ring) or an inelastic ring (for example, a resin ring made of engineering plastic). If the biasing member 57 is made of a material having a lower thermal conductivity than the orbiting scroll base 18, it also contributes to the prevention of heat transfer from the orbiting scroll base 18 to the orbiting bearing 29.

More specifically, the large diameter hole 33a of the bearing hole 33 of the orbiting scroll base 18 is formed to have a larger diameter than the outer ring of the orbiting bearing 29 by a set dimension. Further, in the present embodiment, a mounting groove into which the inner peripheral portion of the biasing member 57 is fitted is formed on the outer peripheral surface of the outer ring of the slewing bearing 29 along the circumferential direction. The annular urging member 57 has an inner peripheral portion fitted into the mounting groove of the outer ring, and an outer peripheral portion fitted into the bearing hole 33 of the orbiting scroll base 18. However, instead of such a configuration, a mounting groove is provided on the inner peripheral surface of the bearing hole 33, and the annular urging member 57 has its outer peripheral portion fitted into the mounting groove of the bearing hole 33 while the inner peripheral portion is fitted. May be fitted into the outer ring of the slewing bearing 29. In any case, the annular urging member 57 is arranged in the gap between the outer ring of the orbiting bearing 29 and the bearing hole 33 of the orbiting scroll base 18. In the present embodiment, each of the slewing bearings 29 is held in the bearing holes 33 at two upper and lower positions on the outer peripheral surface of the outer ring via the annular urging member 57.

A retaining ring 58 is fixed to the orbiting scroll base 18 by bolts 59 on the upper surface of the peripheral side wall of the bearing hole 33. It is preferable that the retaining ring 58 allows the orbiting scroll 2 to move in the radial direction with respect to the outer ring, but restricts the movement in the axial direction.

Assuming that the eccentric shaft portion 8 and the bearing hole 33 are concentrically arranged and rotated, the gap (one side) X between the outer peripheral surface of the outer ring of the slewing bearing 29 and the inner peripheral surface of the large diameter hole 33a of the bearing hole 33 is In the present embodiment, the gap between the side surfaces of the fixed wrap 50 and the swivel wrap 6 (the radial gap of the lap) Y is set to be smaller than the minimum setting value (the designed gap between the laps 50 and 6 in the closest state). It is small, for example, about half (for example, 20 to 30 μm) of the minimum set value. In this case, even if the orbiting scroll 2 swings with respect to the eccentric shaft portion 8 due to centrifugal force to fill the gap X and the orbiting wrap 6 collides with the fixed wrap 50, the orbiting scroll 2 will contact the outer peripheral surface of the outer ring of the orbiting bearing 29. Since the inner peripheral surface of the large diameter hole 33a of the bearing hole 33 contacts first, it is possible to prevent damage due to the collision of both the laps 50 and 6. Moreover, the biasing member 57 prevents the gap X from being filled, and even if the gap X is filled, it can be filled gently.

In this way, the gap between the outer peripheral surface of the slewing bearing 29 and the inner peripheral surface of the large diameter hole 33a is held by the annular urging member 57. As a result, the gap between the outer ring of the orbiting bearing 29 and the bearing hole 33 of the orbiting scroll 2 is filled with the biasing member 57, and when the elastic deformation is possible, the gap can be adjusted.

<Insulation of orbiting scroll body and orbiting scroll base with intermediate material>
Further, as shown in FIG. 3, the orbiting scroll body 17 and the orbiting scroll base 18 are preferably overlapped with each other with the first intermediate member 30 interposed therebetween so as not to come into direct contact with each other. In this embodiment, a washer-shaped intermediate member 30 is interposed between the lower surface of the extension piece 22 and the bottom surface of the recess 26. That is, the bolt 28 for fixing the orbiting scroll main body 17 to the orbiting scroll base 18 is provided after passing through the bolt insertion hole 23 of the extension piece 22 of the orbiting scroll main body 17 and the hole of the intermediate member 30, and then the orbiting scroll base 18. It is screwed into 18 screw holes 27.

The orbiting scroll main body 17 is fixed to the orbiting scroll base 18 with 12 bolts 28. Among them, half of the intermediate materials 30 are heat insulating materials 30A, and the other half are intermediate materials. 30 is a spacer 30B. Specifically, the receiving hole 19 is provided between the pair of recesses 26 arranged corresponding to the respective corners of the substantially triangular orbiting scroll base 18 and the pair of extension pieces 22 attached thereto. The intermediate member 30 is provided along the circumferential direction in the order of, for example, the spacer 30B, the heat insulating material 30A, the heat insulating material 30A, and the spacer 30B.

The heat insulating material 30A and the spacer 30B have substantially the same shape and size as each other, but may have different shapes. By using the spacer 30B according to the thickness and hardness of the heat insulating material 30A, the material selection of the heat insulating material 30A becomes easy. Further, as will be described later, if the spacer 30B is formed of a metal material, the thickness accuracy can be easily obtained and deformation due to the tightening load of the bolt 28 can be suppressed. By sandwiching not only the heat insulating material 30A but also the metal spacer 30B between the concave portion 26 and the extending piece 22, the installation height of the orbiting scroll body 17 with respect to the orbiting scroll base 18 can be maintained at a predetermined level. The vertical arrangement of the fixed scroll 5 and the fixed scroll 5 is determined in a predetermined manner, the variation in clearance at the assembled tip seals 21, 51 is suppressed, and fluid leakage can be prevented.

In any case, the intermediate material 30 is formed of a material having a lower thermal conductivity than that of the orbiting scroll base 18. From that point, even when the intermediate material 30 is the spacer 30B described above, the spacer 30B also functions as a kind of heat insulating material. In the present embodiment, the orbiting scroll body 17 and the orbiting scroll base 18 are formed of a lightweight aluminum alloy, but the intermediate material 30 is, for example, a heat insulating material 30A made of ceramic or synthetic resin, or a spacer 30B made of stainless steel. It Then, as described above, in the receiving hole 19 of the orbiting scroll base 18, the orbiting side substrate portion 16 of the orbiting scroll main body 17 is provided between the inner peripheral surface of the receiving hole 19 and the outer peripheral surface of the orbiting side substrate portion 16. Insert with a gap. In addition, the recess 26 of the orbiting scroll base 18 and the extending piece 22 of the orbiting scroll body 17 not only have the bottom surface of the recess 26 and the lower surface of the extending piece 22 not in direct contact with each other via the intermediate member 30, but also extend out. Since the recess 26 is formed to be slightly larger than the piece 22, the side surface of the recess 26 and the outer edge of the extending piece 22 do not directly contact with each other. Further, in addition to the bolts 28 used for fixing the orbiting scroll body 17 to the orbiting scroll base 18, preferably the lock pin 24 is also a material (here, stainless steel) having a lower thermal conductivity than the orbiting scroll base 18 (aluminum alloy). Are formed from. In this way, heat transfer from the orbiting scroll body 17 to the orbiting scroll base 18 can be prevented, and the orbiting bearing 29 can be protected.

Further, in addition to the heat insulation by the intermediate material 30, when the orbiting scroll body 17 is fitted in the receiving hole 19 of the orbiting scroll base 18, it is between the outer peripheral surface of the orbiting side base plate portion 16 and the inner peripheral surface of the receiving hole 19. A gap is formed. As a result, heat transfer from the orbiting scroll body 17 to the orbiting scroll base 18 is prevented.

<Insulation of fixed scroll and housing with intermediate material>
As in the case of the orbiting scroll 2, the fixed scroll 5 is also removed from the fixed scroll 5 in order to protect the first bearing 36 and the second bearing 37 provided in the housing 4 (more specifically, to prevent the grease from running out). It is preferable to prevent heat transfer to the No. 4 heat exchanger. Therefore, as shown in FIGS. 2 and 4, the fixed scroll 5 and the housing 4 are preferably overlapped with each other via the second intermediate member 54 so as not to come into direct contact with each other.

Specifically, the flange 15 of the housing 4 and the fixed-side substrate portion 20 of the fixed scroll 5 may be overlapped with each other with the intermediate member 54 interposed therebetween. The intermediate member 54 may have a washer shape through which a bolt 53 for fixing the fixed-side base plate portion 20 of the fixed scroll 5 to the flange 15 of the housing 4 is inserted, or may be overlapped with the entire circumferential direction of the flange 15 of the housing 4. It may be a circular ring. Further, as in the case of the orbiting scroll 2, as the intermediate material 54, a heat insulating material and a spacer may be combined. In any case, the intermediate member 54 is formed of a material having a lower thermal conductivity than the housing 4.

Then, the fixed side substrate portion 20 of the fixed scroll 5 is fitted into the opening hole 7A of the housing 4 with a gap between the inner peripheral surface of the opening hole 7A and the outer peripheral surface of the fixed side substrate portion 20. Alternatively, also at the flange 15 of the housing 4, the outer peripheral wrap 52 of the fixed scroll 5 is fitted with a gap between the inner peripheral surface of the flange 15 and the outer peripheral surface of the outer peripheral wrap 52. Further, in addition to the bolt 53 used to fix the fixed scroll 5 to the housing 4, preferably the lock pin 55 is also made of a material (here, stainless steel) having a lower thermal conductivity than the housing 4. In this way, heat transfer from the fixed scroll 5 to the housing 4 can be prevented, and the first bearing 36 and the second bearing 37 can be protected.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be modified as appropriate.

For example, in the above embodiment, the fixed scroll 5 and the housing 4 may be integrally formed. Specifically, the first outer plate 11 and the upper fixed scroll 5 may be integrally formed, and the second outer plate 12 and the lower fixed scroll 5 may be integrally formed.

In the above embodiment, cooling fins may be provided on the outer peripheral portion of the orbiting scroll base 18. For example, fins extending outward at equal intervals in the circumferential direction may be provided on the outer peripheral surface of the orbiting scroll base 18. At this time, the fins may be formed integrally with the orbiting scroll base 18, or may be integrated and overlapped with the outer peripheral portion of the orbiting scroll base 18. In the latter case, in order to improve the adhesion between the orbiting scroll base 18 and the fins, a heat dissipation sheet may be interposed between the two. By providing fins on the orbiting scroll base 18, when the orbiting scroll 2 orbits, forced convection heat transfer with the outside air occurs due to the orbiting motion, and cooling of the orbiting scroll 2 is promoted.

Further, by forming an appropriate groove (for example, a rectangular groove that is separated in the thickness direction of the orbiting scroll base 18 and extends in the circumferential direction of the orbiting scroll base 18) on the outer peripheral portion of the orbiting scroll base 18, You may give the same effect as a fin. By providing a large number of grooves in the outer peripheral portion of the orbiting scroll base 18 along the circumferential direction, the heat transfer area can be increased and effective air cooling can be achieved. In addition, since the strength of the rectangular groove is reduced and the cooling air flows in a direction perpendicular to the axis rather than the axial direction, the air cooling of the orbiting scroll 2 is prevented without hindering the air flow to the groove. Can be done efficiently.

Further, in the above embodiment, the fixed scroll 5 may be air-cooled or water-cooled, particularly in the fixed-side substrate portion 20. For example, the stationary side substrate portion 20 of the fixed scroll 5 is provided with a jacket material that forms a water passage portion between the surface opposite to the fixed wrap 50 or a member that is superposed on the surface, and the water passage portion thereof. Water may be circulated through.

Further, in the above embodiment, when the orbiting scroll 2 in which the orbiting scroll main body 17 is attached to the orbiting scroll base 18 is viewed in a plan view, the ideal center of gravity position of the orbiting scroll 2 and the center of gravity position of the orbiting wrap 6 of the orbiting scroll body 17 are indicated. If the difference is slightly different, the orbiting scroll base 18 may be provided with an appropriate extra thickness for balance adjustment to adjust the position of the center of gravity of the orbiting scroll 2. That is, the position of the center of gravity of the orbiting scroll body 17 can be adjusted on the orbiting scroll base 18 side. Moreover, the entire orbiting scroll 2 can be balanced without enlarging the outer shape of the orbiting scroll base 18. If the component code is displayed on the extra thickness portion provided on the orbiting scroll base 18, the component management becomes easy.

Further, in the above embodiment, the installation of at least one of the tip seal 21 of the swivel wrap 6, the tip seal 51 of the fixed wrap 50, and the outer circumference seal 52A of the outer circumference wrap 52 may be omitted. .. Even in that case, the fixed scroll 5 can be easily attached to and detached from the housing 4, and the orbiting scroll body 17 can be easily attached to and detached from the orbiting scroll base 18, so that the internal maintenance can be easily performed. Therefore, it is possible to easily carry out the surface treatment of the parts, the correspondence to the material, the elimination of the foreign matter from being caught, and the cleaning of the inside.

Further, in the above-described embodiment, the housing 4 is formed in a substantially rectangular shape in a plan view, but the shape is not limited to this, and may be a circular shape, a triangular shape, or another polygonal shape.

Further, in the above-described embodiment, the flange 15 is provided in the accommodation hole 7 of the housing 4, and the outer peripheral portion of the fixed-side base plate portion 20 of the fixed scroll 5 is overlapped and attached to the flange 15, but the installation of the flange 15 is omitted. Then, the outer peripheral portion of the fixed-side substrate portion 20 of the fixed scroll 5 may be attached to the upper and lower surfaces of the housing 4 (the upper surface of the first outer plate 11 and the lower surface of the second outer plate 12) in an overlapping manner. Also in that case, the fixed scroll 5 may be configured to be attachable to and detachable from the housing 4 by using the bolts 53 and the like.

Further, in the above embodiment, the number of the crankshafts 3 is three, but it may be four or more. Also in this case, it is preferable that one of them is used as the driving crankshaft 3A and the rest is used as the driven crankshaft 3B to synchronously rotate through the rotation synchronizing mechanism 45.

In the above embodiment, a cylindrical guide ring may be fitted in the bearing hole 33 of the orbiting scroll base 18. In that case, the annular urging member 57 is installed in the gap between the outer ring of the eccentric shaft portion 8 and the bearing hole 33 of the orbiting scroll base 18, instead of the outer ring of the eccentric shaft portion 8 and the guide ring. It is installed in the gap between the inner hole of and. In this way, the radial position adjustment of the orbiting scroll 2 and the crankshaft 3 can be achieved.

Furthermore, in the above-described embodiment, a plurality of swivel bearings 29 are provided as bearings for holding the eccentric shaft portion 8. However, the swivel bearings 29 are provided with an adjuster between the end faces in addition to overlapping the end faces. May be overlaid. The adjuster is formed, for example, in a cylindrical shape and is arranged on the outer ring. In this way, the axial position adjustment of the orbiting scroll 2 and the crankshaft 3 can be achieved. Similarly, even if the number of the orbiting bearings 29 is one, it is possible to adjust the position of the orbiting scroll 2 and the crankshaft 3 in the axial direction by using the adjuster.

1 Scroll Fluid Machine 3 Crankshaft 5 Fixed Scroll 6 Revolving Lap 8 Eccentric Shaft 16 Revolving Side Board 17 Revolving Scroll Main Body 18 Revolving Scroll Base 19 Receiving Hole (Hole)
20 Fixed Side Substrate 22 Extending Piece 26 Recess 28 Bolt (Fastening Member)
50 fixed wrap 70 outer peripheral portion 71 notch portion 80 bearing portion

Claims (2)

A fixed scroll in which a spiral fixed wrap is provided on the plate surface of the fixed-side substrate portion,
An orbiting scroll main body provided with a spiral orbiting wrap that meshes with the fixed wrap on the plate surface of the orbiting side base plate portion, and a plurality of notches extending radially inward from the end surface of the outer peripheral portion of the orbiting side base plate portion. ,
The orbiting scroll body is fixed via a fastening member that passes through the outer peripheral portion, and a plurality of bearing portions are provided in accordance with the notch portion so as to enter the inside of the notch portion while the orbiting scroll body is fixed. Scroll base,
E Bei and a plurality of crankshaft eccentric shaft portion is provided to be inserted into the bearing portion,
The swivel side substrate portion is provided with a plurality of extending pieces extending outward in the radial direction and at which the fastening members are inserted at intervals in the circumferential direction,
The orbiting scroll base is provided with a recess for accommodating the extension piece,
The scroll fluid machine in which the cutout portion is located between the adjacent extension pieces . The orbiting scroll main body, the orbiting wrap is provided on both surfaces of the orbiting side substrate portion,
A pair of the fixed scrolls are provided on both sides of the orbiting side substrate portion,
The scroll fluid machine according to claim 1, wherein the orbiting scroll base is configured such that the orbiting scroll main body can be attached to and detached from one surface of a hole provided in a central portion of the orbiting scroll base.

Images