JP2582287Y2 - Scroll type fluid machine - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a compressor which sucks gas from a suction port, compresses the gas to a high pressure and discharges the gas from a discharge port, and sucks gas from the container through the suction port to reduce the gas pressure in the container. The present invention relates to a fluid machine such as a vacuum pump or an expander that receives a high-pressure gas from a suction port, expands the inside, discharges the gas as a normal-pressure gas from a discharge port, and converts high-pressure energy into power, and particularly the gas. The present invention relates to a scroll-type fluid machine that performs compression or expansion between a fixed scroll and a movable scroll each having a spiral wrap portion.

[0002]

2. Description of the Related Art A fixed scroll in which a spiral wrap portion is erected on a flat surface of a substrate so as to smoothly connect an involute curve or a semicircle, and an involume which meshes with the wrap portion of the fixed scroll. A spiral wrap portion having the same shape as the wrap portion in which a curved or semicircular shape is smoothly connected is provided with a movable scroll erected on a flat surface of a substrate. The fixed scroll is fixed, and is drivingly connected to a substrate of the movable scroll via a support shaft of a crankshaft formed at an end of a main shaft rotatably supported on the housing, so that the movable scroll is fixed. A revolving motion is performed at the same rotational speed as the main shaft and with the eccentric length of the support shaft of the crankshaft portion with respect to the main shaft as a radius around the center axis of the main shaft. And an Oldham mechanism comprising an Oldham ring and an Oldham key disposed between the housing and the movable-side scroll substrate to prevent the movable-side scroll from rotating relative to the housing, or to provide a support shaft for the crankshaft. A connecting rod having the same eccentric length and effective length with respect to the main shaft is rotatably fixed to the board and the housing of the movable scroll at both ends thereof, and is formed by the crankshaft portion and the connecting rod. 2. Description of the Related Art There is known a scroll fluid machine in which a rotation of a movable scroll relative to a housing is stopped by a link.

In the scroll type fluid machine, the spiral wrap of the movable scroll is revolved with respect to the wrap of the fixed scroll while the rotation of the movable scroll relative to the housing is restrained by the Oldham mechanism or the like. By the movement, the contact position between the two lap portions moves in the longitudinal direction of the spiral wrap portion, and as a result, the contact between the two lap portions due to the contact between the side wall surface of the two lap portions and the flat surface of the both substrates. The working space thus closed is reduced as the contact position between the two wrap portions moves from the outer peripheral position of the substrate of the wrap portion of the fixed scroll to the center position of the substrate.
Therefore, when the main shaft is connected to the prime mover and the main shaft is driven to rotate, the gas sucked from the first opening formed in the housing is compressed at the outer peripheral position of the wrap portion of the movable scroll to compress the center of the substrate of the fixed scroll. When a high-pressure gas is introduced into the working space from the second opening, the main shaft is expanded by the expansion of the high-pressure gas in the working space. Is used as an expander to convert the energy of the high-pressure gas into rotational power of the main shaft.

The wrap portion of the movable scroll extends continuously from the center of the substrate of the movable scroll to the outer peripheral edge of the substrate along a spiral curve such as an involute curve. Even if the substrate is formed eccentrically with respect to the center of the substrate, and the substrate is formed in a disk shape centered on a center axis of a bearing portion for drivingly coupling the substrate and the crankshaft portion of the main shaft, Due to the eccentricity of the wrap portion, the center of gravity of the movable scroll is located at the center of gravity of the wrap portion eccentric with respect to the center axis of the bearing portion. When the scroll type fluid machine is operated, the movable scroll is positioned at the center axis of the bearing portion. , The eccentricity of the position of the center of gravity is one of the causes of vibration. For this reason, it is necessary to accurately remove the imbalance due to the eccentricity of the center of gravity of the movable scroll from the center axis of the bearing. Conventionally, in order to avoid imbalance due to the eccentricity of the position of the center of gravity, a notch is formed on the back surface opposite to the flat surface on which the wrap portion of the substrate of the movable scroll is formed, thereby forming the movable scroll. Although the position of the center of gravity was aligned with the center of the bearing portion, according to this configuration, the thickness of the substrate was partially reduced, causing a risk of insufficient strength, and in order to avoid this, the overall thickness of the substrate was reduced. Increasing the thickness increases the weight. FIG. 11 shows an attempt to eliminate the above-mentioned disadvantage, and FIG. 11 shows a circular substrate 92 having a flat surface on which a wrap portion 91 of a movable scroll 90 is formed.
The back side of FIG. On the back surface of the substrate 92, a thick boss portion 94 having a circular outer periphery 93 having an outer diameter smaller than the outer diameter of the substrate 92 with the center O as the central axis of the substrate 92 is formed. A bearing hole 95 is formed at the center of the boss 94 with the center O of the substrate 92 as the central axis. The boss 9
The thickness of 4 is a thickness obtained by adding the depth of the bearing hole 95 to the thickness of the substrate 92. In this state, due to the eccentricity of the wrap portion 91, the center of gravity G of the movable scroll 90 does not coincide with the center O of the substrate 92 as shown. Therefore, an arc-shaped notch 96 having a large perimeter and a large depth at a radial position connecting the center O and the center of gravity G is formed on the outer peripheral edge 93 of the boss portion 94 on the diametrically opposite side of the notch 96. Are two arc-shaped notches 97, 9 having a short circumference and a small depth.
8, the center of gravity of the movable scroll 90 is made to coincide with the center O of the substrate 92 (see JP-A-63-32182).

[0005]

The center of gravity of the movable scroll coincides with the center axis of a bearing hole formed at the center of the substrate of the movable scroll and serving as a center of rotation of the main shaft of the substrate with respect to the crankshaft. In order to accurately remove the imbalance due to the eccentricity of the center of gravity of the movable scroll from the rotation center axis based on the formation of the eccentricity of the wrap portion, it is necessary to set the position around the bearing hole in the back surface of the substrate or the center of the substrate. It is advantageous that the notch formed in the peripheral edge of the formed boss is formed as far as possible from the center of the bearing hole.
In order to remove the unbalance in the case of the movable scroll 90 having the boss 94 formed around the bearing hole 95 described above, the radius of the outer peripheral edge 93 of the boss 94 is increased, and The notch 9 is formed along the outer peripheral edge 93.
Obviously, it is advantageous to form 6, 97, 98, but this necessarily entails an increase in the weight of the movable scroll. In the present invention, as a means for suppressing the rotation of the movable scroll relative to the housing, a connecting rod having the same eccentric length and effective length of the support shaft of the crankshaft portion with respect to the main shaft is attached to the movable scroll substrate and the housing. A scroll type fluid machine using a mechanism that is rotatably fixed at both ends thereof and that stops a rotation of a movable scroll relative to a housing by a parallelogram link formed by the crankshaft portion and a connecting rod; By forming the balance adjusting portion at a position radially away from the bearing hole for supporting the support shaft of the crankshaft portion on the substrate of the side scroll, the movable scroll can be moved without increasing the weight of the movable scroll. A notch is formed in the substrate to remove unbalance of the side scroll, or a weight is removed by attaching a heavy object or the like. The amount of weight also added less, and is intended to provide a scroll fluid machine capable of performing easily.

[0006]

According to the present invention, a fixed scroll having a wrap portion provided thereon, a wrap portion which meshes with the wrap portion of the fixed scroll are provided, and a wrap portion of the substrate is provided. A movable scroll in which a bearing cylinder is provided upright at the center of the back surface opposite to the surface, a housing accommodating the movable scroll and fixing the fixed scroll, and rotatably supported by the housing. A main shaft having a crankshaft portion provided at one end thereof with a support shaft rotatably supported by a bearing cylinder of the movable scroll at a position decentered by a predetermined dimension from the rotation center axis; The board includes a plurality of connecting rods each of which is rotatably supported on the housing by a pin at the other end of the housing.
The present invention relates to a scroll-type fluid machine which is revolved around a rotation center axis of the main shaft by a crankshaft portion of the main shaft, and is prevented from rotating by the connecting rod.

In the present invention, the bearing cylinder formed upright on the back surface of the flat surface on which the wrap portion is provided in the substrate of the movable scroll has a center axis parallel to a rotation center axis of the main shaft. It has a shape having substantially cylindrical inner and outer wall surfaces formed concentrically, and at a plurality of positions radially separated from the bearing cylinder in the direction of the rotation center axis of the main shaft from the back surface of the substrate. Bearing bosses are formed in a projecting manner, and each bearing boss is provided with a bearing hole for a pin for pivotally supporting the connecting rod to the substrate on the top surface thereof. The peripheral edge of each of the bearing bosses is formed in a recessed shape so that the center of gravity of the movable scroll is aligned with the center axis of the bearing cylinder that supports the support shaft of the crankshaft. Chip formation and It is obtained by the balance adjusting unit for amount thereof added.

[0008]

FIG. 1 is a sectional view showing an embodiment of a scroll compressor according to the present invention. In the drawing, a fixed scroll 1 includes a disk-shaped substrate 2, a flat surface 3 is formed on one surface of the substrate 2, and a flat wrap portion 4 is formed integrally with the flat surface 3 along an involute curve. It is set up in a spiral shape and perpendicular to the flat surface 3. At the outer peripheral edge of the substrate 2, a cylindrical mounting surface portion 5 is formed concentrically with a base circle of an involute curve which forms the spiral base of the wrap portion 4. On the other hand, a housing 6 to which the fixed scroll 1 is to be fixed has a cylindrical inner wall surface 7 formed at one end thereof, and the mounting surface portion 5 of the substrate 2 is closely fitted to the inner wall surface 7, The board 2 is fixed to the housing 6 by a fastener (not shown) such as a bolt at a peripheral edge of the board 2 with the wrap portion 4 facing the inside of the housing 6. The movable scroll 8 includes a flat substrate 9, and a flat wrap portion 11 integrated with a flat surface 10 formed on one surface of the substrate 9.
Is formed in a spiral shape along the involute curve and perpendicularly to the flat surface 10. The dimensions of the wrap portion 11 are substantially the same as the wrap portion 4 of the fixed scroll 1. The other surface of the substrate 9 is a plane parallel to the flat surface 10, and is concentric with the basic circle of the involute curve forming the spiral shape of the wrap portion 11, and has a cylindrical wall-shaped bearing cylinder 1.
2 is erected perpendicularly and integrally with the surface.

The movable scroll 8 has a wrap 11
Is engaged with the wrap portion 4 of the fixed scroll 1.
The flat surface 10 of the plate-shaped substrate 9 is made parallel to the flat surface 3 of the disk-shaped substrate 2 of the fixed scroll 1, and the surface of the substrate 9 on which the bearing tube 12 is provided stands on the inner wall of the housing 6. An annular thrust bearing 14 mounted on the formed annular step 13 is slidably supported on the bearing surface of the bearing 14. The main shaft 15 is rotatably supported by the housing 6 by two bearings 16 and 17 while being prevented from moving in the axial direction. The rotation center axis 18 of the main shaft 15
Is perpendicular to the flat surface 3 of the substrate 2 of the fixed scroll 1,
In addition, the wrap portion 4 erected on the substrate 2 is located at a position corresponding to the center of the base circle of the involute curve forming the spiral base. One end of the main shaft 15 is integrally formed with a crankshaft portion having a support shaft 20 having a center axis 19 parallel to the rotation center axis at an eccentric position separated from the rotation center axis 18 by a predetermined dimension. . The support shaft 20 is a bearing cylinder 12 erected on the disk-shaped substrate 9 of the movable scroll 8.
Is rotatably supported via a bearing 21.

A bearing boss portion 22 is integrally formed on a part of the outer peripheral surface of the bearing tube 12 of the movable scroll 8 and is provided in a bearing hole formed in the bearing boss portion 22. A bearing 23 having a center axis parallel to the center axis of the main shaft 15 is provided in a bearing hole formed in a protruding portion of the inner wall of the housing 6. A connecting rod 27 having pins 25 and 26 at both ends supported by the bearings 23 and 24, respectively, is disposed in parallel with the substrate 9 of the movable scroll 8. The board 9 is connected to the housing 6. Two pins 2 supported on the bearings 23 and 24 of the connecting rod 27
The distance between the central axes of the shafts 5 and 26 is made equal to the dimension between the rotation central axis 18 of the main shaft 15 and the central axis 19 of the support shaft 20 of the crankshaft.
The distance between the center axis of the bearing 2 and the center axis of the bearing 23 is made equal to the distance between the center axis of the rotation of the main shaft 15 and the center axis of the bearing 24 on the housing 6 side. Here, the spindle 1
A parallelogram link having two sides facing the crankshaft portion 5 and the connecting rod 27 is formed. When the main shaft 15 is rotated, the substrate 9 of the movable scroll 8 is rotated by the rotation center axis of the main shaft 15. The distance between the central axis 18 of the support shaft 20 and the center axis 19 of the support shaft 20 is defined as a radius, and revolves around the rotation center axis 18 at the same rotation speed as the rotation speed of the main shaft 15, but the substrate 9 rotates with respect to the housing 6. Never.

As described above, when the movable scroll 8 revolves around the rotation center axis 18 of the main shaft 15, the side surface of the spiral wrap portion 11 formed on the substrate 9 of the movable scroll 8. At one or several points on the side surface of the spiral wrap portion 4 formed on the substrate 2 of the fixed scroll 1, and the line contact portion gradually moves to the center along the spiral shape. As described above, the dimension between the rotation center shaft 18 and the center shaft 19 in the crankshaft portion and the two wrap portions
Is determined in advance. Between the flat surface 3 of the substrate 2 of the fixed scroll 1 and the flat surface 10 of the substrate 9 of the movable scroll 8, the flat surfaces 3, 10 and the wrap portions 4,
The space surrounded by 11 is partitioned into an action space 28 having the line contact portion as a boundary, and the line contact portion is moved by the one-way revolving motion of the movable scroll 8 so that the line contact portion is closed by both wrap portions 4 and 11.
The working space 28 is reduced as it moves from the outer peripheral side to the base circle side of the involute curve. Therefore, the housing 6 is provided at the radially outermost position of the outermost end of the wrap portion 4 of the fixed scroll 1 so that the mounting surface 5
Inner wall 7 of cylindrical wall shape and thrust bearing 14
A first opening 29 is formed at a position between the step portion 13 for supporting the inner side and the disc-shaped substrate 2 of the fixed scroll 1 has a base circle of an involute curve which forms a spiral shape of the wrap portion 4. A second opening 30 is formed in the center of the
In the direction of rotation of 5, with the revolution of the movable scroll 8,
The housing 6 is fixed to the fixed side scroll through the first opening 29.
Gas is sucked into the space 31 between the wrap portion 4 of the
Wrap part 4 of fixed scroll 1 and movable scroll 8
The gas is compressed in the working space between the second opening 30 and the second opening 30, and the compressed gas is discharged from the second opening 30 to act as a compressor.

A balancer 32 is formed on the main shaft 15 at a portion between the two bearings 16 and 17 supported on the housing 6. As described above, the support shaft 20 having the center shaft 19 at one end thereof at an eccentric position with respect to the rotation center shaft 18 of the main shaft 15 is formed integrally with the main shaft 15, and the support shaft portion 33 of the bearing 16 and the bearing 17 are formed. Bearing shaft part 34
Is formed concentrically with a large diameter so that the axial end face 36 of the balancer forming shaft portion 35 abuts against the side surfaces of the inner rings of the bearings 16 and 17. . In the balancer forming shaft portion 35, the center axis 19 of the support shaft 20 is larger than the radius of the balancer forming shaft portion 35 about a radial direction opposite to a radial direction eccentric to the rotation center axis 18. The weight portion 37 having a cylindrical surface with a radius is made to protrude over substantially half a circumference to be formed integrally with the balancer forming shaft portion 35. On the other hand, on the outer peripheral surface of the balancer forming shaft portion 35 on the radially opposite side of the weight portion 37, a central portion in the axial direction is perforated from the outer peripheral surface, leaving a peripheral surface portion forming the axial end surface 36. A recess 38 is formed. Further, a shaft end protruding from the housing 6 at the other end of the main shaft 15 is formed to have a smaller diameter than the main portion of the main shaft 15, and a pulley 39 is fixed to the shaft end after being prevented from rotating by a key. On the outer peripheral surface of the pulley 39, several circumferential grooves 40 having a V-shaped cross section are engraved, and an endless belt (not shown) having a ridge engaging with the circumferential grooves 40 is hung between the pulley 39 and the prime mover. The main shaft 15 is driven via the pulley 39.

[0013] In addition, in FIG.
A mechanical seal 43 for maintaining oil tightness between the housing and the opening of the end wall 41 of the housing 6; 43 is a support cylinder provided between the mechanical seal 42 and the bearing shaft 34 of the main shaft 15; Is a first oil supply hole formed in the end wall portion 41, and lubricating oil supplied from the oil supply hole 44 into the housing 6 passes through a passage 45 through the mechanical seal 42 and the bearing 17.
And is stored in an oil sump 46 formed at the bottom of the housing 6. The lubricating oil supplied into the housing 6 from the second oil supply hole 47 drilled in the housing 6
8, after lubricating the thrust bearing 14 through the bearing 23,
24, 21 and 16 are lubricated and stored in the oil reservoir 46. The lubricating oil stored in the oil reservoir 46 is sent to the space 31 through an oil passage 49 and an oil supply hole 50 formed in the disk-shaped substrate 2 of the fixed scroll 1, and the gas sucked into the space 31 Together with the discharge gas, and is discharged from the discharge port 30 together with the discharge gas, and separated from the gas by an oil separator in the discharge gas storage tank. The oil passage 49 is provided with a pump driven by a prime mover if necessary.
The lubricating oil therein is fed to the oil supply hole 50 and sprayed into the space 31 from the oil supply hole 50. The lubricating oil sent to the working space 28 together with the gas keeps the contact portions of the lap portions 4 and 11 airtight,
It is useful for lubrication and cooling of both laps 4, 11 and gas.

FIGS. 2 and 3 show a first embodiment of the movable scroll in the scroll type fluid machine of the present invention. FIG. 2 is a rear view and FIG. 3 is a side view. The movable scroll 8 extends in a plane perpendicular to the center axis 19 of the support shaft 20 of the crankshaft portion formed on the main shaft 15, and has a disk-shaped substrate 9 whose outer peripheral edge is centered on the center axis 19. A bearing cylinder 12 whose inner and outer wall surfaces are each formed in a concentric cylindrical shape with the center axis 19 as a center, and a lap portion 11 protruding from a flat surface opposite to the plane on which the bearing cylinder 12 is formed. Is provided. Both surfaces of the substrate 9 on which the bearing cylinder 12 and the lap portion 11 are protruded are surfaces perpendicular to the central axis 19, respectively. The bearing 21 is closely fitted to an inner wall surface of the bearing cylinder 12 forming a bearing hole, and the support shaft 20 is rotatably supported by the bearing 21. On the surface of the substrate 9 on which the bearing cylinder 12 is formed, three bearing bosses 22 are formed on the periphery thereof so as to be raised from the surface. As shown in FIG. 2, each of the bearing bosses 22 is formed in the shape of a cylindrical projection having the same outer diameter and having a bearing hole 62 formed on the top surface thereof, and each bearing hole 62 has a center parallel to the central axis 19. They are formed to have the same inner diameter with the shaft 63. Further, the bearing boss portion 22 is located at a position where a line connecting the center axis 63 of each bearing hole 62 and the center axis 19 forms 120 degrees and at a symmetrical position so as to be located at the same radius position from the center axis 19. One of the bearing bosses 22 is formed on a radial line 64 of the substrate 2 connecting the center axis 19 and the center of gravity G of the movable scroll 8 by eccentric formation of the wrap 11. It is arranged so that the central axis 63 of the bearing hole 62 is located. The axial height of the bearing boss 22 is shown in FIG.
As shown in the figure, the height is lower than the axial height of the bearing cylinder 12, and the bearings 23 are closely fitted in the respective bearing holes 62, and the pins 25 of the connecting rod 27 are supported by the bearings 23. . The above-mentioned movable scroll is referred to as a first basic movable scroll.

The basic movable side scroll is provided with a central shaft 19 of the bearing cylinder 12 serving as a rotation center axis of the movable side scroll.
With respect to the above, only the wrap portion 11 is not symmetrically arranged. Therefore, it is necessary to make the center of gravity G of the movable scroll of the basic type coincide with the center axis 19 of the bearing cylinder 12 to remove the imbalance of the movable scroll. For this reason, in the present invention, the periphery of the bearing boss 22 disposed on the periphery of the substrate 9 is used as a balance adjusting portion, and the periphery of at least one bearing boss 22a of the plurality of bearing bosses 22 is set. The shape of the part is changed to other bearing boss parts 22b, 2
The imbalance is removed by molding the peripheral portion 2c so as to have a shape different from that of the peripheral portion 2c. In this embodiment, the first bearing boss portion 22a in which the center axis 63 of the bearing hole 62 is located on a radial line 64 connecting the center of gravity G of the basic movable side scroll with the center axis 19 of the bearing cylinder 12 is A flat adjustment wall 66 perpendicular to the radius line 64 and parallel to the central axis 63 is formed in a portion of the peripheral edge located farther from the bearing cylinder 12 so as to be outside the adjustment portion 66. The movable side scroll 8 of the present embodiment is formed in a shape in which one of the peripheral edges is omitted. In the movable scroll 8 having the adjusting wall portion 66 formed thereon, the first bearing boss portion 22a is located on the radius line 64 as compared with the basic movable scroll having the center of gravity G on the radius line 64. Since the weight of the peripheral portion is reduced by the adjusting wall portion 66 at the peripheral portion, the position of the center of gravity is located on the radius line 64 along the central axis 1.
9 is approached. Therefore, the adjusting wall portion 66 of this embodiment is
The center of gravity of the movable scroll 8 is formed at a position that matches the center axis of the bearing cylinder 12. The shapes of the second and third bearing boss portions 22b and 22c are the same as those of the basic movable scroll.

In the present embodiment, three bearing bosses 22 are provided on the center axis 19 of the bearing cylinder 12 at the periphery of the substrate 9.
The first bearing boss portion 22a corresponds to a radial line 64 connecting the center axis 63 of the bearing hole 62 to the center axis G and the center axis 19 in the basic movable scroll. A center axis 63 of the bearing hole 62 is provided on the radius line, and the adjusting wall portion 66 has a center axis 19 of the first bearing boss portion 22 a on a radius line corresponding to the radius line 64.
Since it is formed at the farthest position, the center of gravity of the movable scroll 8 is made to coincide with the center axis 19 of the bearing cylinder 12 with a slight weight reduction compared to the basic type movable scroll to remove imbalance. Therefore, the adjusting wall portion 66 can be of a small shape, and the three bearing bosses 2
Since it is not necessary to make the area 2 larger than the inner diameter of the bearing hole 62, the weight of the movable scroll 8 does not increase, and the scroll fluid machine can be made compact. It is obvious that the adjusting wall portion 66 is not limited to the planar shape described above, but may be a cylindrical shape or a spherical shape having the radius line 64 as a symmetric axis.

FIG. 3 is a rear view showing a second embodiment of the movable scroll of the scroll fluid machine according to the present invention. In this embodiment, the balance is adjusted using the first basic movable side scroll. Therefore, the same parts as those of the basic movable side scroll are denoted by the same reference numerals, and description thereof will be omitted. In the present embodiment, in the basic movable scroll, what is changed in the first bearing boss portion 22a having the center axis 63 on the radial line 64 connecting the center of gravity G and the center axis 19 of the bearing cylinder 12 Without the second and third bearing bosses 22
The center of gravity of the movable scroll 8 is aligned with the center axis 19 by changing the shape of the peripheral portions of the bearing cylinders b and 22c, and the bearing cylinder 12 of the second and third bearing bosses 22b and 22c is provided. In the position of the peripheral part farther in the radial direction,
The central shaft 19 of the bearing cylinder 12 and the first bearing boss 22a
The enlarged weight portion 67 is integrally formed in a shape symmetrical with a straight line connecting the center shafts 63 of the bearing holes 62. The enlarged weight portion 67 may be fixed to the outer edge of the base plate 9 of the basic movable scroll or the outer edges of the bearing bosses 22b and 22c by adhesion, overlaying, bolting, or the like. When it is formed by molding of a synthetic resin or the like, it is formed integrally with the second and third bearing bosses 22b and 22c by the same material by simultaneous molding.

In the present embodiment, the second and third bearing bosses 22b and 22c are provided with a radial line 6 connecting the center of gravity G of the basic movable side scroll and the center axis 19 of the bearing cylinder 12.
4 and a diameter perpendicular to the radius line 64 through the central axis 19, the center of gravity G
On the other side. Therefore, in the movable scroll 8 of the present embodiment, by adding a heavy object to the second and third bearing boss portions 22b and 22c which are not located on the radius line 64 in the basic movable scroll, the center of gravity of the movable scroll 8 is increased. To the central axis 19. The movable scroll 8 of the present embodiment corresponds to the additional weight.
The second and third bearing bosses 22b, 22c are provided with an enlarged weight portion 67, and the movable weight 8 of the present embodiment is configured such that the center of gravity of the movable scroll 8 is adjusted to the center of the bearing tube 12 by the formation of the enlarged weight portion 67. The unbalance can be removed in accordance with the axis 19. In the first basic type movable scroll, the second and third scrolls are provided on condition that the central axis 63 of the bearing hole 62 of each bearing boss 22 is located at the same radial position from the central axis 19 of the bearing cylinder 12. Bearing boss 2
The position of the central axis 63 of the bearing hole 62 of each of the bearing holes 2b and 22c needs to be symmetrical with respect to the extension line of the radial line 64 connecting the center of gravity G of the basic movable side scroll and the central axis 19 of the bearing cylinder 12. The center angle of the line connecting the center axis 63 of the bearing hole 62 of each of the first and second bearing bosses 22a and 22b to the center axis 19 does not necessarily need to be 120 degrees.

FIG. 5 is a rear view of a third embodiment of the movable scroll in the scroll fluid machine according to the present invention.
In this embodiment, the outer peripheral edges of the three bearing bosses 22 of the first basic type movable scroll and the outer peripheral edge of the bearing cylinder 12 are aligned with the center shaft 19 of the bearing cylinder and the bearings of the respective bearing boss parts 22. A radial line connecting the central axis 63 of the hole 62 has a radially symmetric outer edge, and a width in a direction perpendicular to these radial lines is equal to or less than an outer diameter of the cylindrical bearing boss portion 22. The movable scroll having the width dimension described above and connected by the auxiliary boss portion 70 formed integrally with the substrate 9 as a protrusion is defined as a second basic movable scroll. Other configurations are the same as those of the first basic movable side scroll, and therefore the same portions are denoted by the same reference numerals and description thereof will be omitted. In the second basic type movable side scroll, in FIG.
And a bearing hole 62 having a center axis 63 on a radius line 64 connecting the center axis 19 and the center of gravity G that does not coincide with the center axis G.
The bearing boss 22a is connected to the outer peripheral edge of the bearing cylinder 12 by an auxiliary boss 70 extending along the radius line 64 and symmetrically with the radius line 64.
The second and third bearing boss portions 22b and 22c are formed by the auxiliary boss portion 70 in the same manner as the first bearing boss portion 22a with the radius line of the substrate 2 separated by 120 degrees from the center angle 4 as the symmetric line. I have. Also in the second basic type movable side scroll, the position of the center of gravity does not coincide with the center axis 19 of the bearing cylinder 12 as in the first basic type movable side scroll.

In the second basic type movable scroll, the peripheral portion of the bearing boss portion 22 and the peripheral edge of the auxiliary boss portion 70 connected thereto are used as balance adjusting portions.
In the movable scroll 8 of the third embodiment, a first bearing hole 62 having a central axis 63 on a radial line 64 connecting the center of gravity G of the basic movable scroll and the central axis 19 of the bearing cylinder 12 is provided. The bearing boss portion 22a and the auxiliary boss portion 70 connected to the bearing boss portion 22a do not change the prototype of the basic movable scroll, and the second and third bearing boss portions 22b, 22
The enlarged weight portions 71, 71 are integrally formed by fixing or simultaneous molding with the c and the peripheral edge of the auxiliary boss portion 70 connected thereto so as to be symmetrical with respect to the extension of the radius line 64. Thereby, the position of the center of gravity of the movable scroll 8 is made to coincide with the center axis 19 of the bearing cylinder 12, and the imbalance is removed.

FIG. 6 is a rear view of a fourth embodiment of the movable scroll in the scroll fluid machine according to the present invention.
In this embodiment, the outer peripheral edge is provided between the second and third bearing bosses 22b and 22c of the second basic movable side scroll and the auxiliary boss 70 connected thereto. , 22c the central axis 19 of the bushing 12
The arc 72 that is in contact with the outermost edge farthest away is the outer edge, and the inner edge is the second and third bearing bosses 22b, 22
(c) An enlarged weight portion 73 connected to the auxiliary boss portion 70 and the outer peripheral edge of the bearing cylinder 12 is fixed to the substrate 9 or formed integrally therewith. The shape of the first bearing boss portion 22a is the same as that of the basic type movable bearing scroll. In this embodiment, since the surface area of the enlarged weight portion 73 is large, it is appropriate that the height of the protruding portion from the surface of the substrate 9 toward the central axis 19 of the bearing cylinder 12 is lower than the height of the bearing boss portion 22. Therefore, it is desirable to be formed integrally with the substrate 9.

FIG. 7 is a rear view of a fifth embodiment of the movable scroll in the scroll type fluid machine of the present invention.
In the present embodiment, the shape of the top surface of each bearing boss portion of the second basic movable side scroll is such that the bearing hole 62 is opened at the center and the width in the circumferential direction is adjusted from the central axis 19 of the bearing cylinder 12. The bearing boss portion 52 is formed in a bearing boss portion 52 which is gradually deformed into a trapezoidal shape as it moves away in the radial direction.
The third basic type movable scroll connected to the outer peripheral edge of the bearing cylinder 12 by an auxiliary boss portion 70 having a side edge having a smooth curve as a side edge is used. In the third basic movable side scroll as well, similarly to the second basic movable side scroll, each of the three bearing holes 62 has a line connecting the central axis 63 to the central axis 19 of the bearing cylinder 12 at 120. The center axis 63 of these bearing holes 62 is located at the same radial position as the center axis 19 of the bearing cylinder 12 at the position forming a central angle of degrees, and the outer peripheral edges of the bearing bosses 52 and the auxiliary bosses 70 are It is assumed that the bearing holes 62 have the same shape symmetrical with respect to a radial line passing through the central axis 63 of the bearing hole 62. In the present embodiment, the position G of the center of gravity of the third basic type movable side scroll is
Bearing hole 6 having central axis 63 on radial line 64 connected to
A curved adjusting wall 75 perpendicular to the surface of the substrate 9 is formed on both side edges of the first bearing boss 52a provided with the first bearing boss 52 and the auxiliary boss 70 connected to the first bearing boss 52a. Is smaller than the circumferential width of each of the corresponding second and third bearing bosses 52b and 52c and the auxiliary boss 70 to provide the movable scroll 8 of the present embodiment. Second and third bearing bosses 52b,
The shape of the auxiliary boss portion 52c and the auxiliary boss portion 70 connected thereto is the same as that of the basic type movable side bearing boss portion. The adjusting wall 75
In the movable scroll 8 formed with the same as the first embodiment, as compared with the basic type movable scroll having the center of gravity G on the radius line 64, the first bearing is provided by the adjusting wall portion 75. Since the weight of the boss portion 52a is reduced, the position of the center of gravity of the movable scroll 8 can be aligned with the center axis 19 of the bearing cylinder 12.

FIG. 8 shows a rear view of a sixth embodiment of the movable scroll in the scroll type fluid machine of the present invention.
In the present embodiment, in FIG. 8, a radial line 64 connecting the center axis 19 and the center of gravity G that does not coincide with the center axis 19 of the bearing cylinder 12 for forming the eccentricity of the wrap portion 11 as a basic movable side scroll, The first bearing boss 22a is positioned on a radius line 76 extending from the center shaft 19 to the opposite side of the center of gravity G.
The first bearing boss portion 22a and the auxiliary boss portion 70 are formed such that the center axis 63 of the bearing hole 62 is located, and the second and third bearing boss portions 22b and 22c are respectively displaced from the radial line 76. A fourth basic movable side scroll formed symmetrically so that the center axis 63 of the bearing hole 62 is located on a radius line separated by 120 degrees at the center angle is used. In this basic movable scroll, the radius line 64 where the center of gravity G is located is an extension of the radius line 76 where the center axis 63 of the bearing hole 62 of the first bearing boss 22a is located. By adding a heavy object to the bearing boss portion 22a, the center of gravity of the basic movable scroll can be shifted to the bearing cylinder 1.
2 can be aligned with the central axis 19. In the movable scroll 8 of the present embodiment, as shown in FIG.
An additional weight portion 77 is formed integrally and outside of the first bearing boss portion 22a and the auxiliary boss portion 70 along both side edges thereof and symmetrically with respect to the radial line 76, whereby the center of gravity of the movable scroll 8 is formed. With the center axis 19 of the bearing cylinder 12.
The shapes of the second and third bearing bosses 22b and 22c are the same as those of the basic movable scroll.

FIG. 9 is a rear view of the seventh embodiment of the movable scroll in the scroll type fluid machine of the present invention.
In this embodiment, the first basic type movable scroll described in the first embodiment is used, and the shape of the first bearing boss portion 22a is the same as the bearing boss portion of the basic type movable scroll.
In the second and third bearing bosses 22b and 22c, the inner diameter of the bearing hole 62 is concentrically enlarged to a size larger than the inner diameter of the bearing hole 62 formed in the first bearing boss 22a. Formed second and third bearing bosses 2
A cylindrical sleeve 78 whose outer diameter is equal to the inner diameter of the bearing hole 62 and whose inner diameter is equal to the outer diameter of the bearing 23 for supporting the pin 25 of the connecting rod 27 is provided in the bearing holes 62 of 2b and 22c. And the bearing 23 is supported on the sleeve 78 to form the movable scroll 8 of this embodiment. The sleeve 78 is made of a material having a higher specific gravity than the material constituting the movable scroll 8. For example, when the movable scroll 8 is cast or molded from aluminum or synthetic resin, iron or cast iron is used. Formed by Thereby, the weight of the two sleeves 78 and the sleeves 7
The difference between the weight of the constituent material of the movable scroll 8 and the weight of the movable scroll 8 is added to the second and third bearing bosses 22b and 22c in order to remove imbalance. The second and third bearing bosses 22b, 22c
Since the center axis 63 of the bearing hole 62 is a position symmetrical to the radius line 76 which is an extension of the radius line 64 connecting the center of gravity position G and the center axis 19 of the bearing barrel 12 in the basic movable side scroll, By adding the sleeve 78, the position of the center of gravity of the movable scroll 8 of this embodiment can be made to coincide with the center axis 19 of the bearing cylinder 12.

FIG. 10 is a rear view of an eighth embodiment of the movable scroll in the scroll fluid machine according to the present invention. This embodiment uses the second basic type movable scroll described in the fifth embodiment, and the shape of the first bearing boss portion 22a is the same as the bearing boss portion of the basic type movable scroll. Second and third bearing bosses 22b, 22c
In the same manner as in the seventh embodiment, the inner diameter of the bearing hole 62 is concentrically enlarged, and a cylindrical sleeve 78 is fitted.
The bearing 23 is supported on the sleeve 78 to form the movable scroll 8 of the present embodiment. In this embodiment, as in the seventh embodiment, the second and third bearing bosses 22b and 22c are provided with an unbalance removing weight, and the center of gravity of the movable scroll 8 is shifted. The center axis 19 of the bearing cylinder 12 can be made coincident with the center axis 19. The seventh embodiment shown in FIG. 9 and the eighth embodiment shown in FIG.
As a modification of the embodiment, the second and third bearing bosses 2
The shapes of the base type movable side scrolls 2b and 22c are the same as the shapes of the basic movable side scrolls, respectively.
9 is concentrically enlarged (indicated by broken lines in FIGS. 8 and 9), and has a cylindrical sleeve having the same outer diameter as the inner diameter of the bearing hole 79 and the same inner diameter as the outer diameter of the bearing 23. 8
The bearing 23 can be supported on the sleeve 80 by fitting 0 into it. In this case, the sleeve 80 is formed of a material having a specific gravity smaller than that of the material of the movable scroll 8. For example, when the movable scroll 8 is formed of iron or cast iron, the sleeve 80 is formed of synthetic resin. Is done. As a result, the difference between the weight of the two sleeves 80 and the weight of the constituent material of the movable scroll 8 having the same volume as the sleeves 80 is reduced in the first bearing boss portion 22a in order to eliminate imbalance. Thus, the position of the center of gravity of each of the movable scrolls 8 can be made to coincide with the center axis 19 of the bearing cylinder 12. Further, the inner diameters of the bearing holes 62 of all the bearing bosses 22 and 52 may be enlarged to the same diameter, and sleeves 80 made of materials having different specific gravities may be fitted into the respective bearing holes 62.

In the first to eighth embodiments, each basic type movable scroll is provided with a central shaft 63 of a bearing hole 62 formed in the first bearing bosses 22a and 52a.
Has been described as being located on a straight line connecting the center of gravity G of the basic movable side scroll, that is, the center of gravity of the wrap portion 11, and the center axis 19 of the bearing cylinder 12. Matching the center of gravity of the movable scroll 8 with the center axis 19 of the bearing barrel 12 using the basic type movable scroll of this type connects the center of gravity G of the basic type movable scroll with the center axis 19. The first bearing boss portion 2 is symmetrical with respect to the diameter line.
Adjustment wall portions 66 and 75 are formed only in 2a and 52a (first and fifth embodiments), additional weight portion 77 is formed (sixth embodiment), or second and third bearing bosses By forming the additional weight portion on the portions 22b, 52b, 22c, and 52c (the second, third, and fourth embodiments), only the first bearing boss portion has the shape of the peripheral edge of the other bearing portion. The sleeve 7 is made of a material having a specific gravity greater than the constituent material of the substrate 9 by making the inner diameter of the bearing hole 62 of the second and third bearing bosses 22b and 22c larger than that of the boss.
8 can be simplified by forming the additional weight part by fitting. However, in the present invention, the center axis 63 of the bearing hole 62 formed in the first bearing bosses 22a and 52a is not necessarily on the line connecting the center of gravity G of the basic type movable scroll and the center axis 19 of the bearing cylinder 12. Needless to say, if the position is close to the line, the unbalanced elimination of the movable scroll 8 can be satisfactorily performed.

[0027]

According to the present invention, a support shaft formed at one end of a main shaft rotatably supported by a housing and formed at a position decentered from a rotation center axis of the main shaft is formed on a substrate of a movable scroll. The movable scroll is revolved around a main shaft by being supported by a bearing cylinder, and one end is rotatably supported by a pin on the housing and the other end is rotatably supported by a pin on a substrate of the movable scroll. The present invention relates to a scroll-type fluid machine provided with a restricting means for preventing the movable scroll from rotating with respect to the housing by a plurality of supported connecting rods, a so-called pin crank type restricting means. According to the present invention, the movable-side scroll substrate has substantially concentric inner and outer wall surfaces centered on a central axis parallel to the rotation center axis of the main shaft on the back surface of the flat surface on which the wrap portion is erected. A cylindrical bearing cylinder is formed upright to support a support shaft of a crankshaft formed at an end of the main shaft on the bearing cylinder, and the movable scroll is driven by the main shaft by rotating the main shaft. Revolved around the center axis of rotation. Also, on the substrate of the movable scroll, on the same surface as the surface on which the bearing cylinder is formed in a projecting manner,
A plurality of bearing bosses are formed at a plurality of positions radially separated from the bearing cylinder so as to protrude in the direction of the rotation center axis of the main shaft. At the same radial position, one bearing hole is opened at the top surface and recessed, and a pin for supporting the connecting rod to the substrate is supported by each of the bearing holes.
This prevents the movable scroll from rotating relative to the housing.

At least one of the plurality of bearing bosses is formed so that the shape of the peripheral edge thereof is different from the shape of the peripheral edge portion of the other bearing boss portion, whereby the position of the center of gravity of the movable scroll is adjusted. With the center axis of the bearing cylinder that supports the support shaft of the crankshaft portion. That is, the wrap portion of the movable scroll, which is erected on the flat surface of the substrate, extends spirally from the center of the substrate toward the peripheral edge of the substrate. The wrap portion is formed eccentrically with respect to the center of the substrate, and the center of gravity of the wrap portion is located at a position eccentric from the center of the substrate, in other words, the center axis of the bearing cylinder. On the other hand, at least one of the plurality of bearing bosses protrudingly formed on the back surface of the flat surface of the substrate has a shape different from the shape of the periphery of the other bearing bosses. Since the weights between the bosses are different from each other, an eccentric position of the movable scroll is eccentrically generated by the plurality of bearing bosses. The position of the center of gravity on the diameter connecting the position of the center of gravity of the wrap portion and the center axis of the bearing cylinder is opposite to the position of the center of gravity of the wrap portion with respect to the center axis, and between the center axis and the position of the center of gravity of the wrap portion. Since the center of gravity of the movable scroll can be made coincident with the center axis of the bearing cylinder by causing the scroll at a position separated by a distance, the imbalance can be removed satisfactorily. A bearing boss portion, which is a bearing portion for the movable scroll of the connecting rod for suppressing rotation of the movable scroll relative to the housing, is located at a position radially separated from the bearing cylinder with respect to the movable scroll substrate. Since the projections are formed, even if the difference in the weight of the bearing boss portion due to the difference in the shape of the peripheral portion of the bearing boss portion is slight, the center of gravity of the movable scroll can be made to coincide with the center axis of the bearing cylinder. Therefore, the bearing boss can be used as a balance adjusting portion for removing imbalance of the movable scroll, and the shape of the peripheral edge of the bearing boss does not need to be increased. The required size is sufficient to support the support shaft of the crankshaft part, so it is movable compared to the conventional technology that forms a balance adjustment part near the bearing cylinder. It is possible to reduce the weight of the scroll, it is possible to provide a compact scroll fluid machine.

In the present invention, since the peripheral portion of the bearing boss portion projecting from the peripheral portion of the substrate of the movable scroll is used as the balance adjusting portion, the center of gravity of the lap portion with respect to the center axis of the bearing cylinder is provided. In the case of a movable scroll having a small amount of eccentricity, the bearing boss can be formed independently of the bearing cylinder so as to be erected at a symmetrical position with respect to the center axis of the bearing cylinder, and the center of gravity of the lap portion can be formed. In the case of a movable scroll with a large amount of eccentricity, a narrow auxiliary boss that connects each bearing boss to the bearing cylinder connects the center axis of the bearing hole of the bearing boss to the center axis of the bearing cylinder. By forming them symmetrically with respect to the radius line, the periphery of the bearing boss portion and the auxiliary boss portion can be used as a balance adjusting portion. In addition, the bearing boss portion, in which the shape of the peripheral portion is different from the shape of the peripheral portion of the other bearing boss portion, has a center axis of the bearing hole on a diameter line connecting the position of the center of gravity of the lap portion and the center axis of the bearing cylinder, or the like. By positioning the movable scroll in the vicinity, the difference in the shape of the peripheral portion is reduced, and a movable scroll that is advantageous in reducing the weight of the movable scroll is provided. In addition, in the movable side wrap portion where the amount of eccentricity of the center of gravity of the wrap portion is small, the plurality of bearing wrap portions have the same shape. In the bearing holes of these bearing bosses, the pins are pivotally supported via cylindrical sleeves, and the material of the sleeve is made of a material having a different specific gravity. The unbalance of the movable scroll can be satisfactorily removed by matching the center axis.

[Brief description of the drawings]

FIG. 1 is a sectional view of a scroll type fluid machine according to the present invention.

FIG. 2 is a rear view of the first embodiment of the movable scroll.

FIG. 3 is a side view of the movable scroll according to the first embodiment.

FIG. 4 is a rear view of a second embodiment of the movable scroll.

FIG. 5 is a back view of a third embodiment of the movable scroll.

FIG. 6 is a back view of a fourth embodiment of the movable scroll.

FIG. 7 is a rear view of a fifth embodiment of the movable scroll.

FIG. 8 is a rear view of a sixth embodiment of the movable scroll.

FIG. 9 is a rear view of the seventh embodiment of the movable scroll.

FIG. 10 is a rear view of the eighth embodiment of the movable scroll.

FIG. 11 is a rear view of a conventional movable scroll.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed side scroll 4 Its wrap part 6 Housing 8 Movable side scroll 9 Its substrate 11 Its wrap part 12 Bearing cylinder 15 Main shaft 18 Its rotation center axis 20 Crank shaft part support shaft 22 Bearing boss part 25, 26 Pin 27 Connecting rod 62 , 79 Bearing hole 63 Its central axis 66, 75 Adjusting wall 67, 71, 73, 77 Additional weight part 78, 80 Sleeve

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F04C 18/02 311 F04C 25/02

Claims (5)

(57) [Scope of request for utility model registration] 1. A fixed scroll in which a spiral wrap is vertically provided on a flat surface of a substrate, and a spiral wrap engaged with the wrap of the fixed scroll is vertically erected on the flat surface of the substrate. A movable scroll having a bearing tube formed upright at the center of the back surface of the flat surface of the substrate, a housing accommodating the movable scroll and fixing the fixed scroll, and rotatable on the housing. A main shaft having at one end thereof a crankshaft portion provided with a support shaft which is supported by the bearing cylinder formed on the substrate of the movable scroll at a position decentered by a predetermined dimension from the rotation center axis. And a plurality of connecting rods, one end of which is rotatably supported by a pin on the substrate of the orbiting scroll and the other end of the housing, respectively. In the scroll-type fluid machine, the substrate is revolved around the rotation center axis of the main shaft by the crankshaft portion of the main shaft, and the rotation of the substrate is suppressed by the connecting rod. The bearing cylinder, which is formed upright on the back surface of the flat surface on which the wrap portion is provided, has a substantially cylindrical inner and outer wall surface formed concentrically about a center axis parallel to a rotation center axis of the main shaft. A plurality of bearing bosses are formed at a plurality of positions radially separated from the bearing cylinder in a direction of a rotation center axis of the main shaft from a back surface of the substrate, and top surfaces of these bearing bosses are formed. In each of the bearings, a bearing hole of a pin for pivotally supporting the connecting rod to the base plate is opened one by one at the same radial position around the center axis of the bearing cylinder. Is formed in each of the bearing bosses, and at least one of the bearing bosses is formed by changing the shape of the peripheral edge of the bearing boss from the shape of the peripheral edge of the other bearing boss. A scroll type fluid machine wherein a center of gravity of a side scroll is made coincident with a center axis of the bearing cylinder which supports a support shaft of the crankshaft portion. 2. The bearing boss portion, wherein each of the bearing bosses is formed independently of each other on the back surface of the substrate, and is also formed independently of the bearing cylinder.
3. The scroll type fluid machine according to item 1. 3. The bearing boss according to claim 1, wherein each of the bearing bosses is connected to an outer wall of the bearing cylinder by an auxiliary boss protruding from a back surface of the substrate. 3. The scroll fluid machine according to 2. 4. A method according to claim 1, wherein one of said bearing bosses is disposed near a diameter line connecting a center of gravity of a wrap portion of said movable scroll and a central axis of said bearing cylinder. The scroll type fluid machine according to any one of claims 1 to 3. 5. A fixed scroll in which a spiral wrap is vertically provided on a flat surface of a substrate, and a spiral wrap engaged with the wrap of the fixed scroll is vertically erected on the flat surface of the substrate. A movable scroll having a bearing tube formed upright at the center of the back surface of the flat surface of the substrate, a housing accommodating the movable scroll and fixing the fixed scroll, and rotatable on the housing. A main shaft having at one end thereof a crankshaft portion provided with a support shaft which is supported by the bearing cylinder formed on the substrate of the movable scroll at a position decentered by a predetermined dimension from the rotation center axis. And a plurality of connecting rods, one end of which is rotatably supported by a pin on the substrate of the orbiting scroll and the other end of the housing, respectively. In the scroll-type fluid machine, the substrate is revolved around the rotation center axis of the main shaft by the crankshaft portion of the main shaft, and the rotation of the substrate is suppressed by the connecting rod. The bearing cylinder, which is formed upright on the back surface of the flat surface on which the wrap portion is provided, has a substantially cylindrical inner and outer wall surface formed concentrically about a center axis parallel to a rotation center axis of the main shaft. A plurality of bearing bosses are formed at a plurality of positions radially separated from the bearing cylinder in a direction of a rotation center axis of the main shaft from a back surface of the substrate, and top surfaces of these bearing bosses are formed. In each of the shafts, a bearing hole of a pin for pivotally supporting the connecting rod to the substrate is opened at a same radial position around the center axis of the bearing cylinder. Holes are formed in the respective bearing bosses, and the bearing bosses have the same shape as the shape projected on the flat surface of the substrate of the movable scroll, and are supported by these bearing bosses. The pins have the same diameter, and a sleeve made of a material having a specific gravity different from the material of the movable scroll is externally fitted to at least one of the pins, and a shaft is formed in a bearing hole recessed in the bearing boss. A scroll-type fluid machine, wherein the center of gravity of the movable scroll is aligned with the center axis of a bearing cylinder protruding from a substrate of the movable scroll.