JP2004162622A - Air supply device and method for assembling and positioning the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air supply device having excellent low vibration property and low noise property by easily and exactly performing an alignment of a compression mechanism part and a motor part. <P>SOLUTION: A disc-shaped positioning plate 37 fitted to a projecting part 31C formed at a supporting portion of a bearing 72 of a mechanical casing 31 for storing a swiveling scroll 21 is mounted on a motor frame 11. As a result, the alignment of the motor part 10 provided with the motor frame 11 and a stator 12, etc. and the compression mechanism part 20 provided with the swiveling scroll 21, a rotation restraining member 23 and the mechanical casing 31, etc. is easily and exactly performed. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an air supply device used as, for example, a supercharger for an engine or an air compressor for a fuel cell.
[0002]
[Prior art]
To date, several types of gas compressors have been realized, and scroll compressors, one of the gas compressors, are excellent in low vibration and low noise due to their mechanism. It is necessary to precisely align the compression mechanism with the motor. Specifically, it is the alignment of the rotor attached to the motor shaft and the stator attached to the motor frame, and it is necessary to accurately align these cores. As a conventional centering method, there is a method of assembling by sandwiching a gap gauge between a rotor and a stator. It is also necessary to increase the suction volume and suppress the operation speed so as to achieve low vibration and low noise. A simple way to increase the suction volume is to increase the height of the scroll wrap or to extend the wrap by increasing the radial dimension.
[0003]
[Problems to be solved by the invention]
As described above, it is important to align the rotor with the stator and reduce the number of operating revolutions in order to sufficiently exhibit the low vibration and low noise characteristics unique to the scroll compressor.
[0004]
As a centering method, a method of assembling by sandwiching a gap gauge is generally used, but workability is poor. In addition, when the fixing bolt is tightened, the inclination of the motor shaft may occur, resulting in an uneven gap between the rotor and the stator.
[0005]
Further, as a method of increasing the suction volume and suppressing the operation speed, it is possible to increase the height of the scroll wrap or to enlarge the scroll wrap in the radial direction. The force is increased, and the size of other members including the shaft is increased.
[0006]
Therefore, an object of the present invention is to provide an air supply device excellent in low vibration and low noise by easily and accurately aligning a compression mechanism portion and a motor portion.
[0007]
Another object of the present invention is to provide an air supply device that is excellent in low vibration and low noise by increasing the suction volume without increasing the size and suppressing the operation speed.
[0008]
[Means for Solving the Problems]
The present invention according to claim 1 includes a stator fixed to a motor frame, a rotor fixed to a motor shaft and rotating in the stator, a mechanical shaft integrally formed with the motor shaft, and the mechanical shaft. An orbiting scroll that operates, a rotation restricting member that orbits the orbiting scroll, a mechanical casing that houses the orbiting scroll, and a fixed scroll that forms a compression space between the orbiting scroll and both ends of the motor shaft. Are rotatably held by a first bearing and a second bearing, and the mechanical shaft passes through the orbiting scroll and the fixed scroll, and the second bearing and the third bearing are provided at both ends of the orbiting scroll. And an air supply device rotatably held by said member, said member supporting a second bearing of said mechanical casing. The disc-shaped positioning plate which protrusion mates formed, in which attached to the motor frame.
[0009]
According to a sixth aspect of the present invention, a stator fixed to a motor frame, a rotor fixed to a motor shaft and rotating in the stator, a mechanical shaft integrally formed with the motor shaft, and an operation by the mechanical shaft Orbiting scroll, a rotation restricting member for orbiting the orbiting scroll, a mechanical casing for accommodating the orbiting scroll, and a fixed scroll for forming a compression space between the orbiting scroll and both ends of the motor shaft. The mechanical shaft is rotatably held by a first bearing and a second bearing, and the mechanical shaft penetrates the orbiting scroll and the fixed scroll, and is rotated at both ends of the orbiting scroll by the second bearing and the third bearing. An air supply device that is freely held, wherein the end plate of the fixed scroll and the mirror of the orbiting scroll are provided. In this case, the starting position of the center side end of each of the wraps to be erected is formed from a place away from the center, and the compression ratio determined from the involute shape is set to be larger than 1.0 and 1.2 or less. .
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
According to a first aspect of the present invention, a disc-shaped positioning plate that fits with a convex portion formed at a position supporting the second bearing of the mechanical casing is attached to the motor frame. According to this configuration, it is possible to easily and accurately align the motor portion provided with the motor frame and the stator with the compression mechanism portion provided with the orbiting scroll, the rotation restricting member, and the mechanical casing. As a result, low vibration and low noise can be realized.
[0011]
According to a second aspect of the present invention, in the first aspect, the first balance weight is provided between the rotor and the second bearing, and the second balance weight is provided between the fixed scroll and the third bearing. It is provided in. According to this configuration, the first balance weight can be attached using the space generated between the rotor and the mechanical casing, so that the dimension in the axial direction can be reduced.
[0012]
According to a third aspect of the present invention, in the second aspect, a through hole is provided in a central portion of the second balance weight. According to this configuration, a passage through which the compressed air flows to the discharge casing through the discharge port of the fixed scroll, including the through-hole, can be secured, and the passage resistance can be suppressed, thereby reducing power consumption. Can be achieved.
[0013]
According to a fourth aspect of the present invention, in the second aspect of the present invention, the left and right outer contour lines of the second balance weight are located inside a tangent line connecting the mechanical shaft mounting arc portion and the outermost peripheral arc portion. The balance weight is formed. According to this configuration, the center of gravity of the balance weight can be kept away from the mechanical shaft while the discharge passage of the compressed air is secured, and the size of the balance weight can be reduced.
[0014]
According to a fifth aspect of the present invention, a stator fixed to a motor frame, a rotor fixed to a motor shaft and rotating in the stator, a mechanical shaft integrally formed with the motor shaft, and an operation by the mechanical shaft Orbiting scroll, a rotation restricting member for orbiting the orbiting scroll, a mechanical casing for accommodating the orbiting scroll, and a fixed scroll for forming a compression space between the orbiting scroll and both ends of the motor shaft. A first bearing held by a motor bearing plate and a second bearing held by a mechanical casing are rotatably held, and the mechanical shaft penetrates the orbiting scroll and the fixed scroll. The two ends are rotatably held by the second bearing and the third bearing. In a pneumatic supply device in which a disc-shaped positioning plate fitted to a projection formed at a position supporting a second bearing of the motor is mounted on the motor frame, before the motor shaft is mounted, the positioning plate is connected to the motor frame. A method for assembling and positioning an air supply device fixed to a motor shaft, wherein one end has the same size as a portion received by a first bearing of a motor shaft, an intermediate portion has the same size as an outer diameter of a rotor, and the other end has Inserts a jig having the same size as the outer diameter of the convex portion of the mechanical casing into the second bearing and the positioning plate in a temporarily fixed state, and positions the jig with the motor frame holding the second bearing and the motor bearing plate. The positioning plate is fastened to the motor frame with the core aligned with the plate. According to this configuration, the positioning plate can be fixed at a favorable position with respect to the motor frame.
[0015]
According to this method, the alignment between the rotor attached to the motor shaft and the stator attached to the motor frame can be performed easily and accurately. As a result, low vibration and low noise can be realized.
[0016]
According to a sixth aspect of the present invention, the start positions of the center side ends of the wraps erected on the end plate of the fixed scroll and the end plate of the orbiting scroll, respectively, are formed from locations away from the center, so that the involute shape is obtained. The determined compression ratio is greater than 1.0 and less than or equal to 1.2. According to this configuration, when a large compression ratio is not required, it is possible to increase the turning radius while keeping the compression ratio relatively small, so that the suction can be performed while maintaining the scroll splash height constant. The volume can be increased. As a result, low vibration and low noise can be realized.
[0017]
The invention according to claim 7 is the invention according to claim 6, wherein the diameter of the mechanical shaft is 30 mm or more and 35 mm or less. According to this configuration, the diameter of the mechanical shaft can be made relatively large, the amount of deflection of the mechanical shaft caused by the centrifugal force of the orbiting scroll and the balance weight can be reduced, and contact between the wraps can be prevented. As a result, the radial gap of the wrap can be further reduced, and high efficiency can be achieved.
[0018]
According to an eighth aspect of the present invention, in the invention of the sixth aspect, a rib is provided at a center side end portion of the orbiting scroll wrap, and the rib is formed by further extending the wrap erected on the orbiting scroll. Is also provided at a low height. According to this configuration, the strength of the center portion of the wrap of the orbiting scroll can be secured, and deformation due to pressure and heat can be reduced.
[0019]
(Embodiment)
Hereinafter, an embodiment of an air supply device according to the present invention will be described with reference to the drawings. FIG. 1 is a side sectional view showing the overall configuration of an air supply device according to the present embodiment, FIG. 2 is a side sectional view showing a motor portion and a jig of the air supply device according to the present embodiment, and FIG. FIG. 4 is a front view showing a second balance weight of the air supply device according to the embodiment, FIG. 4 is a front view showing a second balance weight of the air supply device according to the embodiment, and FIG. 5 is a swing of the air supply device according to the embodiment. FIGS. 6A and 6B are a front view and a main part side view showing the orbiting scroll wrap of the air supply device according to the present embodiment.
[0020]
As shown in FIG. 1, the air supply device according to the present embodiment includes a motor unit 10, a compression mechanism unit 20, and a discharge casing unit 50.
The motor unit 10 includes a cylindrical motor frame 11, a stator 12 fixed to an inner surface of the motor frame 11, a rotor 13 fixed to a motor shaft 41 and rotating in the stator 12, and an end surface on one end side of the motor frame 11. And a motor bearing plate 14 that seals the motor. The motor bearing plate 14 has a first bearing 71 at the center of the plate, and the first bearing 71 rotatably holds one end of the motor shaft 41 on one end. Reference numeral 61 denotes a cooling pipe wound around the outer periphery of the motor frame 11.
[0021]
The compression mechanism 20 includes a orbiting scroll 21 operated by a mechanical shaft 42 formed eccentrically with the motor shaft 41, a fixed scroll 22 that forms a compression space 26 between the orbiting scroll 21, and an orbiting scroll 21. And a rotation restricting member 23 for rotating the. The orbiting scroll 21 is provided with an orbiting scroll wrap 21A erected at a predetermined height, and the fixed scroll 22 is provided with a fixed scroll wrap 22A erected at a predetermined height. The orbiting scroll wrap 21A and the fixed scroll wrap 22A are arranged so as to mesh with each other. Note that a gap is provided between the side surface of the orbiting scroll wrap 21A and the side surface of the fixed scroll wrap 22A so as not to contact each other. Tip seals 21B and 22B are provided on the end surfaces of the tip ends of the orbiting scroll wrap 21A and the fixed scroll wrap 22A, respectively. Therefore, the tip of the orbiting scroll wrap 21A and the fixed scroll 22 are in contact via the tip seal 21B, and the tip of the fixed scroll wrap 22A is in contact with the orbiting scroll 21 via the tip seal 22B.
[0022]
The mechanical casing 31 that accommodates the orbiting scroll 21 includes a disk-shaped partitioning plate 31A that seals the other end surface of the motor frame 11 and the one end surface of the compression mechanism unit 20, and a cylinder that covers the outer periphery of the compression mechanism unit 20. And a member 31B. The partition board 31A has a through hole 33 at the center thereof, and a second bearing 72 is provided in the through hole 33. The other end of the motor shaft 41 is rotatably held by the second bearing 72. The cylindrical member 31 </ b> B has an inlet 24 for introducing air into the compression mechanism 20.
[0023]
The discharge casing 51 provided in the discharge casing section 50 is constituted by a disk-shaped plate 51A and a cylindrical member 51B continuous to the outer peripheral end of the plate 51A. A third bearing 73 is provided at the center of the plate 51A, a plate 35 is interposed between the cylindrical member 51B and the fixed scroll 22, and the discharge port 25 outside the disk-shaped plate 51A is excluded. A plate 36 is attached to the location. An adapter 48 is attached to the other end of the mechanical shaft 42. The adapter 48 is rotatably held by the third bearing 73 with the center of the adapter 48 and the rotation center of the motor shaft aligned. Further, the plate 51A has a discharge port 25 for discharging the air compressed by the compression mechanism section 20.
[0024]
The rotation restricting member 23 disposed in the compression mechanism 20 restricts the rotation of the orbiting scroll 21 about the mechanical shaft 42, and makes the orbiting scroll 21 only the orbiting operation about the motor shaft 41. Specifically, the rotation restricting member 23 is configured by a crankpin disposed between the mechanical casing 31 and the orbiting scroll 21. The rotation restricting member 23 has a bearing such as a bearing at each shaft end. This bearing is preferably a ball bearing filled with grease. The three rotation restricting members 23 are provided between the partition 31A and the orbiting scroll 21, and the respective rotation restricting members 23 are provided at equal distances from the mechanical shaft 42 and at equal intervals. It is preferable that three or more rotation restricting members 23 are provided.
[0025]
The shaft 40 is configured by integrally forming a motor shaft 41 and a mechanical shaft 42. The shaft 40 is rotatably held at one end by a first bearing 71, at an intermediate position by a second bearing 72, and at the other end by a third bearing 73 via an adapter 48. The motor shaft 41 is held by the first bearing 71 and the second bearing 72, and the mechanical shaft 42 is held by the second bearing 72 and the third bearing 73. 42 also has a configuration of supporting both ends. The mechanical shaft 42 is configured to be eccentric with respect to the motor shaft 41 at the crank portion.
[0026]
The mechanical shaft 42 is provided with bearings 74 and 75 such as bearings. The orbiting scroll 21 is rotatably held by the two bearings 74 and 75. At this time, the bearing 74 is disposed on the base side of the orbiting scroll wrap 21A, and the bearing 75 is disposed on the distal end side of the orbiting scroll wrap 21A.
[0027]
The mechanical shaft 42 is provided with a preload spring 44. The preload spring 44 is disposed between the second balance weight 47 and the bearing 75 while a compressive load is applied. Therefore, the preload spring 44 presses the inner ring-side member of the bearing 75 toward the motor unit 10 and presses the inner ring-side member of the bearing 75 toward the motor unit 10. And presses the orbiting scroll 21 toward the motor unit 10 as a result. The pressing force applied to the orbiting scroll 21 is received by the rotation restricting member 23, so that the overturn of the orbiting scroll 21 during the low-speed operation can be suppressed, and the vibration can be suppressed.
[0028]
The mechanical shaft 42 is provided with a shaft seal 45. The shaft seal 45 is provided at a position between the bearing 74 and the bearing 75 and adjacent to a position of the bearing 75 on the bearing 74 side. The shaft seal 45 prevents the compressed air from leaking to the bearing 74 side.
[0029]
In addition to the above configuration, the air supply device according to the present embodiment is provided with a configuration for easily and accurately aligning the compression mechanism unit 20 with the motor unit 10.
[0030]
That is, as shown in FIGS. 1 and 2, a positioning plate 37 is attached to the motor frame 11 in advance, and an inner diameter portion of the positioning plate 37 and an outer diameter portion of the convex portion 31C formed on the partition board 31A. Are fitted so that the cores of the motor unit 10 and the compression mechanism unit 20 and the cores of the rotor 13 and the stator 12 match.
[0031]
Here, when fixing the positioning plate 37 to the motor frame 11, a jig 80 is used. The shape of the jig 80 is such that one end portion 80A is finished with the same size as the portion received by the first bearing 71 of the motor shaft 41, the intermediate portion 80B is finished with the same size as the outer diameter of the rotor 13, and the other. The end portion 80C is finished with the same size as the outer diameter of the convex portion 31C of the partition board 31A. The jig 80 is inserted into the motor frame 11 to which the stator 12 is fixed, and the motor bearing plate 14 and the positioning plate 37 in a temporarily fixed state. With the core aligned. This makes it possible to easily and accurately align the rotor 13 attached to the motor shaft 41 with the stator 12 attached to the motor frame 11.
[0032]
In addition, by attaching the motor frame 11 and the mechanical casing 31 via the positioning plate 37 as described above, the cores of the motor unit 10 and the compression mechanism unit 20 automatically match, thereby providing low vibration and low vibration. Noise can be realized.
[0033]
In general, in a scroll compressor, since the orbiting scroll 21 is eccentrically attached to the mechanical shaft 42, a centrifugal force is generated by an eccentric mass during operation, and the rotation balance is lost and vibration occurs in the state as it is. . In order to prevent such a situation, in this embodiment, a first balance weight 46 and a second balance weight 47 are provided in order to balance the rotation, and the first balance weight 46 is connected to the motor shaft. The second balance weight 47 is attached to the mechanical shaft 42. In particular, the first balance weight 46 attached to the motor shaft 41 is configured so that its size can be accommodated in a space surrounded by the inner diameter of the stator 12, the rotor 13, the partition 31A and the positioning plate 37. .
[0034]
With this configuration, the first balance weight 46 is attached to the stator 12 by utilizing the space created between the rotor 13 and the partition plate 31A and the positioning plate 37 of the mechanical casing 31, so that the first balance weight 46 is separated from the stator 12. The size in the axial direction can be reduced as compared with the case where the space is provided between the board 31A and the positioning plate 37.
[0035]
Next, another embodiment will be described with reference to FIGS. The compressed air is guided from the discharge port 22 </ b> C provided in the fixed scroll 22 to the discharge casing section 50. However, since the second balance weight 47 rotates together with the mechanical shaft 42, the compressed air becomes discharge resistance, and Pressure loss occurs in some parts. Therefore, in this embodiment, the through hole 47A is provided in the center of the second balance weight 47, and the discharge path is enlarged as compared with the case where the through hole 47A is not provided.
[0036]
According to this configuration, a passage through which the compressed air flows to the discharge casing 51 via the discharge port 22C of the fixed scroll 22 can be secured, and the passage resistance can be suppressed to reduce power consumption.
[0037]
FIG. 4 shows another embodiment. In this embodiment, the left and right outer lines 47B of the second balance weights 47 are formed so as to be located inside the linear outer lines 47C. . As a result, as compared with the case where the left and right outlines of the second balance weight 47 are formed along the linear outline 47C, the discharge path is enlarged, and at the same time, the center of gravity of the second balance weight 47 is linearly shaped. As a result, the second balance weight 47 can be reduced in size, and thus can be reduced in the axial direction.
[0038]
Next, an embodiment according to another configuration for reducing the number of operating revolutions and reducing low vibration and low noise will be described with reference to FIG.
The compression ratio determined from the involute shape of the orbiting scroll wrap 21A and the fixed scroll wrap 22A can be calculated from the ratio between the confined volume and the discharged volume. If the confined volume and the discharge volume are the same, the volume ratio is 1.0 and the compression ratio is also 1.0. As shown in FIG. 5, in this embodiment, the start of the center-side ends of the wraps (orbiting scroll wrap 21A and fixed scroll wrap 22A) standing on the end plate of fixed scroll 22A and the end plate of orbiting scroll 21, respectively. The compression ratio determined from the involute shape is set to be greater than 1.0 and less than or equal to 1.2 by forming the position from a place distant from the center (by delaying the start position of the so-called center side end). Thus, when a large compression ratio is not required, it is possible to increase the turning radius by keeping the compression ratio relatively small, and to maintain the suction height of the scroll at a constant height, that is, the volume to be confined. Can be increased. As a result, it is possible to reduce the operation rotation speed, and further, it is possible to achieve low vibration and low noise.
[0039]
Further, a configuration for further reducing vibration and noise will be described with reference to FIG. In order to increase the discharge flow rate, there is a method of increasing the number of revolutions. In this case, the mechanical shaft 42 is bent by the centrifugal force of the orbiting scroll 21 and the wraps (the orbiting scroll wrap 21A and the fixed scroll wrap 22A) come into contact with each other. May be caused. As described above, the suction radius is increased by increasing the turning radius and delaying the winding start position of the wrap, but in this embodiment, the shaft diameter of the mechanical shaft 42 penetrating the orbiting scroll 21 is further increased. are doing. If the diameter of the shaft is large, the amount of deflection is reduced, but if the diameter is formed to a certain degree or more, it becomes impossible to configure an involute shape. Therefore, the diameter of the mechanical shaft 42 is preferably 30 mm or more and 35 mm or less.
[0040]
According to this configuration, not only the amount of deflection of the mechanical shaft 42 due to the centrifugal force of the orbiting scroll 21 and the second balance weight 47 can be reduced, but also contact between the wraps (the orbiting scroll wrap 21A and the fixed scroll wrap 22A) can be prevented. As a result, the radial gap of the wrap can be further reduced, and high efficiency can be achieved.
[0041]
Another embodiment will be described with reference to FIG. When the outer diameter of the boss 21C located at the center of the orbiting scroll 21 is reduced to reduce the centrifugal force of the orbiting scroll 21, the boss 21C and the orbiting scroll wrap 21A are separated from each other. . In this case, there is a possibility that the portion near the center of the orbiting scroll wrap 21A may be damaged by pressure or heat. Therefore, in this embodiment, as a preventive measure, a rib 21D is provided at the center side end of the orbiting scroll wrap 21A to secure the strength. The rib 21D is formed by further extending the orbiting scroll wrap 21A, and is provided at a lower height than the orbiting scroll wrap 21A.
[0042]
According to this configuration, the strength of the center portion of the wrap of the orbiting scroll 21 can be secured, and deformation due to pressure and heat can be reduced.
[0043]
【The invention's effect】
As described above, according to the present invention, the disk-shaped positioning plate fitted to the projection of the mechanical casing is attached to the motor frame, so that the motor unit provided with the motor frame and the stator, the orbiting scroll and the rotation constraint The alignment with the compression mechanism provided with the member and the mechanical casing can be easily and accurately performed, and low vibration and low noise can be realized.
[0044]
Further, by providing the first balance weight between the rotor and the second bearing and providing the second balance weight between the fixed scroll and the third bearing, a space created between the rotor and the mechanical casing. Since the balance weight can be attached by utilizing the above, the dimension in the axial direction can be reduced, and the size of the air supply device can be reduced.
[0045]
Further, by providing a through hole in the center of the second balance weight, passage resistance can be suppressed, and power consumption can be reduced.
In addition, the left and right outer lines of the second balance weight are formed so as to be located inside a tangent line connecting the mechanical shaft mounting arc portion and the outermost arc portion, thereby securing a discharge passage for compressed air and achieving balance. The center of gravity of the weight can be kept away from the mechanical shaft, and the size of the balance weight can be reduced, and the size of the air supply device can be reduced.
[0046]
One end has the same size as the portion of the motor shaft received by the first bearing, the intermediate portion has the same size as the outer diameter of the rotor, and the other end has the same size as the outer diameter of the projection of the mechanical casing. Is inserted into the temporarily fixed second bearing and the positioning plate, and the positioning plate is positioned in a state where the motor frame holding the second bearing is aligned with the motor bearing plate and the positioning plate. Can be easily and accurately aligned with the motor frame, and low vibration and low noise can be realized.
[0047]
Further, the starting positions of the center side ends of the wraps respectively erected on the fixed scroll end plate and the orbiting scroll end plate are formed from locations away from the center portions, and the compression ratio determined from the involute shape is set to 1.0. By making it larger, 1.2 or less, it becomes possible to increase the turning radius, and it is possible to increase the suction volume while keeping the scroll height constant, resulting in low vibration and low noise. Can be realized.
[0048]
In addition, by setting the diameter of the mechanical shaft to 30 mm or more and 35 mm or less, the amount of deflection of the mechanical shaft due to the centrifugal force of the orbiting scroll and the balance weight can be reduced, and contact between the wraps can be prevented. As a result, the gap in the radial direction of the wrap can be further reduced, and high efficiency can be achieved.
[0049]
In addition, a rib is provided at the center side end of the orbiting scroll wrap, and the rib is formed by further extending the wrap erected on the orbiting scroll, and is provided at a lower height than the wrap, so that the orbiting scroll wrap is provided. The strength of the central portion can be secured, and deformation due to pressure or heat can be reduced.
[Brief description of the drawings]
FIG. 1 is a side cross-sectional view showing an entire configuration of an air supply device according to an embodiment of the present invention; FIG. 2 is a side cross-sectional view showing a motor unit and a jig of the air supply device according to the embodiment; FIG. 4 is a front view showing a second balance weight of the air supply device according to the embodiment; FIG. 4 is a front view showing a second balance weight of the air supply device according to the embodiment; FIG. FIGS. 6 (a) and 6 (b) are a front view and a main part side view of the orbiting scroll wrap of the air supply device according to the present embodiment. Description】
DESCRIPTION OF SYMBOLS 10 Motor part 11 Motor frame 12 Stator 13 Rotor 14 Motor bearing plate 20 Compression mechanism part 21 Orbiting scroll 21A Orbiting scroll wrap 21D Rib 22 Fixed scroll 22A Fixed scroll wrap 23 Rotation restraining member (crank pin)
31 Mechanical casing 31C Convex portion 37 Positioning plate 40 Shaft 41 Motor shaft 42 Mechanical shaft 46 First balance weight 47 Second balance weight 47A Through hole 47B Right and left outer lines 47C Straight outer line 50 Discharge casing unit 51 Discharge casing 71 First 1st bearing 72 2nd bearing 73 3rd bearing

Claims (8)

A stator fixed to a motor frame, a rotor fixed to a motor shaft and rotating in the stator, a mechanical shaft integrally formed with the motor shaft, an orbiting scroll operated by the mechanical shaft, and the orbiting scroll A rotation restricting member for orbiting, a mechanical casing for accommodating the orbiting scroll, and a fixed scroll for forming a compression space between the orbiting scroll and
Both ends of the motor shaft are rotatably held by a first bearing and a second bearing, and the mechanical shaft penetrates the orbiting scroll and the fixed scroll, and the second bearing is provided at both ends of the orbiting scroll. And an air supply device rotatably held by a third bearing and
An air supply device, wherein a disc-shaped positioning plate that fits with a convex portion formed at a position supporting a second bearing of the mechanical casing is attached to the motor frame. The air supply device according to claim 1, wherein a first balance weight is provided between the rotor and the second bearing, and a second balance weight is provided between the fixed scroll and the third bearing. 3. The air supply device according to claim 2, wherein a through hole is provided in a central portion of the second balance weight. 3. The air supply device according to claim 2, wherein the second balance weight is formed such that left and right outer lines of the second balance weight are located inside a tangent connecting the mechanical shaft mounting arc portion and the outermost peripheral arc portion. . A stator fixed to a motor frame, a rotor fixed to a motor shaft and rotating in the stator, a mechanical shaft integrally formed with the motor shaft, an orbiting scroll operated by the mechanical shaft, and the orbiting scroll A rotation restricting member for orbiting, a mechanical casing for accommodating the orbiting scroll, and a fixed scroll for forming a compression space between the orbiting scroll and
Both ends of the motor shaft are rotatably held by a first bearing held by a motor bearing plate and a second bearing held by a mechanical casing, and the mechanical shaft penetrates the orbiting scroll and the fixed scroll. And both ends of the orbiting scroll are rotatably held by the second bearing and the third bearing,
In the air supply device, a disc-shaped positioning plate that fits with a convex portion formed at a position supporting the second bearing of the mechanical casing is attached to the motor frame.
Before mounting the motor shaft, it is an assembly positioning method of an air supply device for fixing the positioning plate to the motor frame,
One end has the same size as the portion received by the first bearing of the motor shaft, the middle has the same size as the outer diameter of the rotor, and the other end has the same size as the outer diameter of the projection of the mechanical casing. Is inserted into the first bearing and the positioning plate in a temporarily fixed state, and the motor bearing plate holding the first bearing, the motor frame, and the positioning plate are aligned. An assembly and positioning method for an air supply device, wherein the motor bearing plate and the positioning plate are fastened to the motor frame in a state. A stator fixed to a motor frame, a rotor fixed to a motor shaft and rotating in the stator, a mechanical shaft integrally formed with the motor shaft, an orbiting scroll operated by the mechanical shaft, and the orbiting scroll A rotation restricting member for orbiting, a mechanical casing for accommodating the orbiting scroll, and a fixed scroll for forming a compression space between the orbiting scroll and
Both ends of the motor shaft are rotatably held by a first bearing and a second bearing, and the mechanical shaft penetrates the orbiting scroll and the fixed scroll, and both ends of the orbiting scroll communicate with the second bearing. An air supply device rotatably held by a third bearing,
The starting position of the center-side end of the wrap, which is erected on the end plate of the fixed scroll and the end plate of the orbiting scroll, respectively, is formed from a position away from the center, and the compression ratio determined from the involute shape is 1.0. An air supply device that is larger than 1.2. The air supply device according to claim 6, wherein the diameter of the mechanical shaft is 30 mm or more and 35 mm or less. 7. The orbiting scroll wrap is provided with a rib at a center end thereof, wherein the rib is formed by further extending the wrap standing on the orbiting scroll, and is provided at a lower height than the wrap. An air supply device as described.

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