JP5172115B2 - Swirl compressor and method of manufacturing vortex compressor - Google Patents

Description

  The present invention relates to a vortex compressor that pumps fluid (air, gas such as gas, liquid, etc.) and a method of manufacturing the vortex compressor.

  For example, in the case of a vortex compressor, when the rotating blade rotates, the fluid is sucked in from the portion where the casing concave groove expands in the vicinity of the suction port, and as the rotating blade advances, the fluid wraps around the outer periphery in a plan view. It is accelerated and pressurized while moving, and is discharged in a direction (radially outward) perpendicular to the rotation axis from a portion where the casing groove is blocked near the discharge port.

  As an example of the vortex compressor, the configuration of the blower in FIG. 4 will be described. The blower 51 includes a motor 52 and a rotating blade (impeller) 53. For the motor 52, for example, an inner rotor type brushless motor is used. A stator core 55 and a motor board 56 are sandwiched between the motor case 54a and the motor case 54b and are assembled together. The rotary shaft 57 is rotatably supported by motor cases 54a and 54b via bearings (bearings) 58a and 58b. A rotor magnet 59 is provided on the rotating shaft 57 so as to face the stator core 55.

  The rotation shaft 57 of the motor 52 extends from the motor case 54b to the impeller 53 side. The impeller 53 is assembled by fitting the collar 60 on the rotating shaft 57 and adjusting the position in the axial direction. The impeller 53 is accommodated in the casings 61a and 61b. The casing 61a is fixed to the motor case 54b with screws.

In FIG. 5, the impeller 53 has a disk shape, and the impeller side recesses 62 and the partition walls 63 that are radially formed on both surfaces of the outer periphery of the disk are alternately formed in the circumferential direction. A case-side recess 64 is also provided on the inner wall surface of the casing 61 so as to face the impeller-side recess 62 in a range indicated by an arrow P in the circumferential direction. When the impeller 53 rotates in the direction of the arrow Q, the pressure is reduced at the arrow position R where the impeller-side recess 62 and the case-side recess 64 face each other, so that fluid is sucked from the suction port 65 and the impeller-side recess 62 faces. A high-pressure fluid is discharged from the discharge port 66 at an arrow position S where 64 is blocked (see Patent Document 1).
JP 2005-291149 A

  In the above-described vortex compressor, the assembly error of the motor 52, that is, the assembly errors of the motor cases 54 a and 54 b and the stator core 55, makes it difficult to make a perpendicularity of the rotating shaft 57 to the mounting surface of the motor case 54 b. On the other hand, the parallelism between the mounting surface of the motor case 54b and the casings 61a and 61b can achieve a predetermined accuracy by processing each mounting surface. However, since the squareness of the rotating shaft 57 with respect to the mounting surface of the motor case 54b is difficult to obtain accuracy from the assembly error of the motor 52, there is a problem that the parallelism between the impeller 53 and the casings 61a and 61b is lowered. Therefore, in order to avoid at least the interference between the impeller 53 and the casings 61a and 61b, it is necessary to increase the clearance between the casings 61a and 61b (for example, provide about 0.2 mm). Further, if the gap between the impeller 53 and the casings 61a and 61b is increased, fluid leakage or backflow is likely to occur, resulting in increased pressure loss and reduced efficiency.

  The present invention has been made to solve these problems, and the object of the present invention is to improve the assembly accuracy between the impeller and the rotating shaft, and to reduce and equalize the clearance between the impeller and the casing with high efficiency. An object of the present invention is to provide a vortex compressor and a manufacturing method thereof.

In order to achieve the above object, the present invention comprises the following arrangement.
An impeller in which blade grooves provided radially on the outer peripheral side are formed over the entire circumference are housed in a casing in which concave grooves are formed in a portion facing the blade grooves, and are assembled integrally with the motor rotor shaft, An eddy current compressor in which an impeller rotates to suck fluid from a suction port where the blade groove and the casing groove face each other, and the blade groove and the casing groove are discharged from a discharge port blocked by the casing. The impeller is assembled between bearings that support the motor rotor shaft provided in the casing, and the rotor is integrally assembled to the motor rotor shaft that extends outward from the casing. A cylindrical body portion is projected in the axial direction at the central portion of the casing side surface facing the motor side, and a recess is formed on the outer periphery thereof, and the motor substrate is placed in the recess The cylindrical body and the rotor are assembled so as to overlap each other in the axial direction, and the motor housing in which the stator is assembled is opposed to the stator and the rotor. As described above, the casing is integrally assembled so as to serve as a motor housing that accommodates a motor with reference to the casing.
On the other hand, in the above-described method for manufacturing a vortex compressor, a step of accommodating an impeller rotatably around a rotor shaft between bearing portions provided in the casing, and extending outward from the casing. a step of assembling together the rotor in the rotor shaft and the motor housing the stator is assembled on the basis of the said casing such that the rotor and the stator is opposed, steps of assembling together to the casing It is characterized by including.

If the eddy current compressor and the manufacturing method thereof described above are used, the impeller is assembled between the bearing portions provided in the casing, and the rotor is integrally assembled to the rotor shaft extending outward from the casing. The motor housing with the stator assembled is integrally assembled with the casing with respect to the casing so that the stator and the rotor face each other, so the perpendicularity between the casing and the rotating shaft is high, and the impeller As a result, the parallelism of the casing is increased, the clearance between the impeller and the casing is reduced and uniformed, and an efficient vortex compressor can be provided.
In addition, a cylindrical body and a recess are formed on the side of the casing facing the motor side, the motor substrate is housed in the recess, and the cylindrical body and the rotor are assembled so as to overlap in the axial direction. By combining the motor housing with the motor housing, the number of parts can be reduced to improve the assembly performance, and the assembly error and machining error can be suppressed and the bearing span can be increased without increasing the size of the compressor in the axial direction. As a result, rotational runout can be suppressed.
In particular, an impeller is rotatably accommodated around a rotor shaft between bearings provided in the casing, and then the rotor is assembled to the rotation shaft, and the motor housing is integrated with the casing based on the casing. Since it is assembled, the assembly accuracy between the impeller and the rotary shaft is high, and the assembly is good.

  BEST MODE FOR CARRYING OUT THE INVENTION The best embodiment of the eddy current compressor and the manufacturing method thereof according to the present invention will be described below with reference to the accompanying drawings. Hereinafter, a blower will be described as an example of the vortex compressor. The blower is housed in a casing in which a casing groove is formed in a portion where an impeller in which a blade groove partitioned by radial blades on the outer peripheral side is formed in a circumferential direction on the rotor shaft of the motor is opposed to the blade groove. . The impeller rotates to suck fluid from the outer peripheral suction port where the blade groove and the casing concave groove face each other, and the blade groove and the casing concave groove are discharged from the outer peripheral discharge port blocked by the casing. As the motor, a motor with a DC brush, a DC brushless motor, or the like is used, and any of an inner rotor type and an outer rotor type can be applied.

A schematic configuration of the vortex compressor will be described with reference to FIGS. 1 and 2.
In FIG. 1, a casing 1 is screwed together with a first case 2 and a second case 3. In the casing 1, a bearing portion (bearing) 4 is incorporated in the first case 2, and a bearing portion (bearing) 5 is incorporated in the second case 3. A rotary shaft 6 is rotatably supported by the bearings 4 and 5. An impeller 7 is assembled to the rotating shaft 6 with bearings 4 and 5 having an axial position defined.

In FIG. 2, the impeller 7 has a disk shape, and blade grooves (impeller-side concave portions) 8 and partition walls 9 that are radially formed on both outer peripheral sides are alternately formed over the entire circumference. Further, in FIG. 1, the case-side recess 10 is also provided on the inner wall surfaces of the first case 2 and the second case 3 so as to face the impeller-side recess 8 in the range indicated by the arrow P in the circumferential direction. When the impeller 7 rotates in the arrow Q direction, the pressure is reduced at the arrow position R where the impeller-side recess 8 and the case-side recess 10 face each other, so that the fluid is sucked from the suction port 11 and the impeller-side recess 8 faces the case-side recess. A high-pressure fluid is discharged from a discharge port 12 provided in the casing 1 at an arrow position S where 10 is blocked.
FIG. 3 shows a schematic diagram of a developed cross section at the center line M of the impeller 7. When the impeller 7 rotates in the direction of the arrow Q, the space is widened at a position where the impeller-side concave portion 8 and the case-side concave portion 10 face each other, resulting in a pressure drop. For this reason, fluid is sucked into the impeller 7 from the suction port 11. In addition, the fluid that becomes high pressure as the impeller 7 rotates rotates against the casing wall surface 21 where the case-side recess 10 is blocked and is guided to the discharge port 12.

In FIG. 1, the rotating shaft 6 extends outward from the second case 3. A rotor (rotor magnet) 16 is integrally assembled with the rotating shaft 6. On the motor side surface of the second case 3, a cylindrical body portion 13 protrudes from the central portion, and a recess 14 is formed around the cylindrical body portion 13. A bearing 5 is held on the inner wall side of the cylindrical portion 13. Further, the motor substrate 15 is fitted on the outer peripheral side of the cylindrical body portion 13 and accommodated in the recess 14. The motor substrate 15 is housed in the recess 14 and the cylindrical body portion 13 and the rotor 16 are assembled so as to overlap in the axial direction.

A stator 18 is assembled on the inner wall of the motor housing 17. The stator 18 has a stator core and a coil wound around the stator core. The motor housing 17 is positioned so that the stator 18 and the rotor 16 face each other, and the outer shape of the stator 18 is fitted in the second case 3 and the motor housing 17 in the axial direction and fixed with screws. . A motor is formed by the second case 3 and the motor housing 17. The lead wire 19 connected to the motor board 15 is drawn out from the opening 20 of the second case 3 and the motor housing 17. Thus, by using a part of the casing 1 also as the motor housing 17, the number of parts can be reduced and the assemblability can be improved. In addition, when a part of the rotor 16 is overlapped and accommodated in the cylindrical portion 13, the size of the blower is not increased in the axial direction, and the bearing span can be increased, so that rotational runout can be suppressed.

Next, the manufacturing method of the vortex compressor will be described. The impeller 7 is accommodated in a space formed by joining the first case 2 and the second case 3 constituting the casing 1.
The rotor shaft 6 is inserted between the bearing portions 4 and 5 provided in the first and second cases 2 and 3, and the first and second cases 2 and 3 are screwed and the impeller around the rotation shaft 6. 7 is rotatably accommodated in the casing 1.

  In addition, a rotor 16 is integrally assembled with a rotating shaft 6 extending outward from the casing 1. In the recess 14 formed in the second case 3, the motor substrate 15 is assembled on the outer peripheral side of the cylindrical body portion 13. The motor housing 17 to which the stator 18 is assembled is aligned so that the stator 17 and the rotor 16 face each other, and the outer shape of the stator 18 is fitted in the second case 3 and the motor housing 17 in the axial direction. It is fixed with screws.

  As described above, the impeller 7 is accommodated around the rotor shaft 6 supported between the bearing portions 4 and 5 in the casing 1, and then the rotor 16 is assembled to the rotating shaft 6, and the motor housing 17 is connected to the casing 1. Therefore, the perpendicularity between the casing 1 and the rotor shaft 6 is high, the parallelism between the impeller 7 and the casing 1 is also high, and the clearance between the impeller 7 and the casing 1 is reduced and made uniform. Can do. As an example, a place where the clearance between the impeller 7 and the casing 1 (the first case 2 and the second case 3) is usually 0.1 mm to 0.15 mm can be reduced to 0.1 mm or less. Therefore, it is possible to provide an efficient vortex compressor that does not cause fluid leakage or reverse flow and has little pressure loss.

  Although the said Example demonstrated the blower, it is not limited to this, It can apply also to other apparatuses, such as an electric pump which pumps a fluid.

It is sectional drawing of a vortex compressor. It is a top view of an impeller. It is a section expanded view of an impeller. It is sectional drawing of the conventional eddy current type compressor. It is a top view of the conventional impeller.

Explanation of symbols

1 casing
2 First case 3 Second case
4, 5 Bearing 6 Rotating shaft
7 Impeller 8 Impeller side recess
9 Partition wall
10 Case side recess
11 Suction port 12 Discharge port
13 Tube part
14 recess
15 Motor board
16 Rotor
17 Motor housing
18 Stator
19 Lead wire
20 Opening 21 Casing wall

Claims (2)

An impeller in which blade grooves provided radially on the outer peripheral side are formed over the entire circumference are housed in a casing in which concave grooves are formed in a portion facing the blade grooves, and are assembled integrally with the motor rotor shaft, An eddy current compressor in which an impeller rotates to suck fluid from a suction port where the blade groove and the casing groove face each other, and the blade groove and the casing groove are discharged from a discharge port blocked by the casing. And
The impeller is assembled between bearings that support the motor rotor shaft provided in the casing, and the rotor is integrally assembled to the motor rotor shaft that extends outward from the casing,
A cylindrical part protrudes in the axial direction in the central part of the casing side facing the motor side, and a recess is formed in the outer periphery thereof, and the motor board is stored in the recess by inserting the cylindrical part into the board hole. ,
The cylindrical body and the rotor are assembled so as to overlap each other in the axial direction, and the motor housing on which the stator is assembled is used with the casing as a reference so that the stator and the rotor face each other. A vortex-type compressor characterized in that it is integrally assembled to serve as a motor housing. A method of manufacturing a vortex compressor according to claim 1,
A step of rotatably accommodating an impeller around a rotor shaft between bearing portions provided in the casing;
A step of assembling together the rotor in the rotor shaft which extends outwardly from said casing,
The motor housing the stator is assembled on the basis of the said casing such that the rotor and the stator is opposed, the manufacturing method of the vortex type compressor characterized in that it comprises a step of assembling together on the casing.

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