KR100273370B1 - Turbo compressor - Google Patents

Abstract

PURPOSE: A turbo compressor is provided to reduce size of the compressor by reducing the number of rotors of driving motor, while reducing the manufacturing cost by reducing the parts count. CONSTITUTION: A turbo compressor comprises a closed container(110) including a first compression chamber(111) with an inlet port(110a), a second compression chamber(112) with an outlet port(110b) and a motor chamber formed between first and second compression chambers; an axial driving motor mounted in the motor chamber; a driving shaft(130) coupled to a mover of the driving motor, and which transfers a driving force generated from the driving motor; impellers(140,150) coupled to both ends of the driving shaft and inserted into each compression chambers, and which have a plurality of magnets mounted to each rear surface of impellers opposed to the stator of the driving motor; radial bearings(160A,160B) disposed outside of impellers so as to support the driving shaft in a radial direction; and a thrust bearing(170) disposed outside of impellers so as to support the driving shaft in an axial direction.

Description

Turbo compressor

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turbocompressor equipped with a radial Bieldi motor, and more particularly, to a turbocompressor that uses an inner surface of an impeller as part of a motor and simplifies a thrust bearing.

In general, a compressor is a machine that compresses gas such as air or refrigerant gas by a rotary motion of a vane or a rotor or a reciprocating motion of a piston, and is a power generator for driving a vane, a rotor, and a piston, and a driving force transmitted from the power generator. It consists of a compressor mechanism for sucking and compressing gas.

The compressor is classified into a sealed type or a separate type according to the arrangement of the power generating portion and the compression mechanism portion, wherein the sealed type is a type in which the power generating portion and the compression mechanism portion are installed together in a predetermined sealed container, and the separate type is outside the sealed container. The power generating unit is installed in the driving force generated in the power generating unit is transmitted to the compression mechanism in the sealed container.

The hermetic compressor includes a rotary, reciprocating, linear and scroll compressor according to a structure for compressing gas. In recent years, the impeller is rotated by a driving force of a motor, and the gas is sucked by using a centrifugal force generated when the impeller is rotated. Turbo compressors (or centrifugal compressors) for compression are newly introduced.

1 is a longitudinal cross-sectional view schematically showing the configuration of a two-stage compression turbocompressor, which the inventor has filed with a patent application No. 97-64567. As shown therein, the two-stage compression turbocompressor of the prior application is usually an accumulator ( A first compression chamber 11 in communication with A) and a second compression chamber 12 in communication with a normal condenser (not shown) are formed on both sides of the hermetically sealed container 10, respectively, and inside the hermetically sealed container 10. In the center, a motor chamber 13 in which an axial type brushless DC motor 20 is mounted is formed, and the first and second compression chambers 11 and 12 and the motor chamber 13 are formed of gas. Both ends of the drive shaft 30, which are in communication with each other by the flow path 14 and are coupled to the motor 20 and rotated, are inserted into the first and second compression chambers 11 and 12, respectively, and the first and second ends thereof are respectively inserted into the first and second compression chambers 11 and 12. First and second impellers 40 and 50 for compressing the gas sucked while rotating in the second compression chambers 11 and 12 in two stages are combined.

In addition, a radial bearing 60 is coupled to both sides of the drive shaft 30, that is, both sides of the motor 20, to prevent vertical vibration of the drive shaft 30. Thrust bearings 70 for supporting the axial direction of the drive shaft 30 are coupled to both outer sides.

The first and second compression chambers 11 and 12 communicate with the gas flow passage 14 to induce suction refrigerant, respectively, and the first and second compressors, respectively. The first and second diffusers 11a and 12a and the first and second volutes 11b and 12b convert the kinetic energy of the refrigerant accelerated by the second impellers 40 and 50 into the static pressure, respectively.

The first and second impellers 40 and 50 are formed to have a smaller outer diameter than the inner diameter through which the gas is compressed, so that the first and second impellers 40 and 50 are fixed in a conical shape based on the driving shaft 30.

In the figure, reference numeral 10a denotes an inlet port, and 10b denotes an outlet port.

The two-stage compression turbocompressor of the prior application configured as described above is operated as follows.

That is, when the induction magnet is generated in the motor unit 20 by the applied power, the drive shaft 30 starts to rotate at a high speed by the induction magnet, and the first and second fixed to both ends of the drive shaft 30. 2 Impellers 40 and 50 rotate, and the refrigerant gas is sequentially sucked into each of the compression chambers 11 and 12 by the rotation of the impellers 40 and 50, and then each of the impellers 40 and 50 It is sprinkled in the form of a screw by centrifugal force and flows into each volute 11b and 12b through each diffuser 11a and 12a. At this time, the process flows into each volute 11b and 12b via each diffuser 11a and 12a. In this case, the refrigerant gas was converted into the compressed gas by the rise of the pressure head and discharged to the condenser (not shown) through the discharge port 110b.

However, in the above-described turbo compressor of the above-mentioned application, an axial type BCD motor 20 is mounted in the middle of the drive shaft 30, and radial and thrust bearings 60, 70 are provided on both sides of the motor 20. ) Are coupled to each other, and impellers 40 and 50 are coupled to both ends of the drive shaft 30, thereby increasing the size of the compressor as a whole.

Accordingly, the present invention has been made in view of the problems of the prior-art turbo compressor, and an object thereof is to miniaturize a turbo compressor equipped with an axial DC motor.

1 is a longitudinal sectional view showing the configuration of a pre- filed turbocompressor.

2 is a longitudinal sectional view showing the configuration of a turbocompressor according to the present invention.

3 is a cross-sectional view taken along line A-A of FIG.

* Explanation of symbols for main parts of the drawings

110: sealed container 11a, 110b: suction, discharge port

111,112: first and second compression chambers 114: gas flow paths

120: Bildish Motor 121: Stator

122: rotor 130: drive shaft

140, 150: 1st, 2nd impeller 160A, 160B: 1st, 2nd radial bearing

170: thrust bearing M: magnet

In order to achieve the object of the present invention, a hermetically sealed container in which a first compression chamber having a suction port and a second compression chamber having a discharge port are formed on both sides so as to communicate with each other, and a motor chamber is formed between the two compression chambers; An axial type drive motor mounted inside the motor chamber to generate a driving force; A drive shaft coupled to the mover of the drive motor to transmit a driving force while rotating; An impeller coupled to both ends of the drive shaft so as to correspond to both stators of the drive motor, and inserted into each compression chamber, and a plurality of rotor magnets mounted on each rear surface of the drive motor facing each other; Radial bearings disposed on an outer side of the impeller to support a driving shaft in a radial direction; A turbocompressor is also provided which is disposed outside the impeller and includes a thrust bearing for supporting the drive shaft axially.

Hereinafter, the turbocompressor according to the present invention will be described in detail based on the embodiment shown in the accompanying drawings.

FIG. 2 is a longitudinal cross-sectional view showing the configuration of the turbocompressor according to the present invention, and FIG. 3 is a 'A-A' cross-sectional view of FIG. 2, which is a front view of the impeller forming part of the motor.

As shown in the drawing, the turbo compressor according to the present invention has a first compression chamber 111 having an inlet port 110a and a second compression chamber 112 having an outlet port 110b communicating with each other by the gas flow passage 114. Is formed in the central portion of the sealed container 110, the biaxial motor 120 of the axial type is coupled to the middle of the drive shaft 130 passing through the first and second compression chambers (111, 112), the drive shaft 130 ), The first and second impellers 140 and 150 are mounted in the respective compression chambers 111 and 112 so that the suction side thereof faces outwardly, and the drive shaft 130 is located on the outer side of the first and second compression chambers 111 and 112, respectively. The first and second radial bearings 160A and 160B for holding the centrifugal vibrations of the drive shaft are mounted, and the axial balance of the drive shaft 130 is only on the outer side of each of the radial bearings 160A and 160B. A thrust bearing 170 is mounted to hold the thrust bearing 170.

The BCD motor 120 is the stator disk plate 121 and the rotor disk plate 122 are alternately arranged, among which the rotor disk plate 122 than the number of the stator disk plate 121. The number of is arranged one more. The stator disk plate (hereinafter referred to as a stator) 121 is fixedly mounted on an inner circumferential surface of a gas chamber formed between each of the compression chambers 111 and 112 of the sealed container 110, and between the stators 121. A rotor disk plate (hereinafter referred to as a rotor) 122 is integrally formed or press-fitted on the outer circumferential surface of the drive shaft 130 with a predetermined gap, and both outer rotors of the rotor 122 122 is a magnet (M) is mounted on the rear surface of the first and second impeller (140,150) at equal intervals.

The first radial bearing 160A is coupled to the inner circumferential surface of the suction port 110b of the hermetic container 110, and the second radial bearing 160B is disposed on the inner circumferential surface of the gas passage 114 outlet side of the hermetic container 110. Combined.

The thrust bearing 170 has an annular support surface (not shown) in the middle of the inlet port (110a) of the sealed container 110, a flange portion (unsigned) to impart a support pressure to the support surface (unsigned) Is integrally formed on the drive shaft 130.

The general operation of the turbocompressor equipped with the motor cooling structure according to the present invention as described above is the same as in the prior application.

That is, the drive shaft 130 and the impellers 140 and 150 are rotated by the applied power, and the refrigerant from the evaporator or the accumulator of the refrigerating cycle apparatus is supplied to the inducer of the first compression chamber 111 through the refrigerant inlet 110a. Unsigned), and the refrigerant gas flowing into the inducer of the first compression chamber 111 is temporarily compressed while being dispersed by the first impeller 140 into the diffuser and the vortex of the first compression chamber. The compressed compressed refrigerant gas is sucked into the second impeller 150 through the gas flow passage 114 and is completely compressed in two stages in the second compression chamber 112 and discharged to the refrigeration cycle apparatus (exactly, a condenser). .

Here, even if the drive shaft 130 is rotated at a high speed by the axial type BCD motor 120, the radial direction of the drive shaft 130 is supported by each radial bearing (160A, 160B), The axial direction is offset by the thrust bearing 170, wherein the support surface of the thrust bearing 170 is formed as an annular groove in the middle of the inlet port (110a), the support surface of the annular groove integral with the drive shaft 130 Since the flange portion is inserted to impart a supporting pressure, only one thrust bearing 170 can sufficiently prevent the axial bias of the drive shaft 130.

In addition, by combining several magnets (M) on the inner circumferential surfaces of the first and second impellers (140,150) to utilize as part of the rotor (122), the number of discs required for the rotor (122) is reduced.

Thus, since the thrust bearing 170 is mounted only on one side, the space required for the thrust bearing 170 is reduced, and each impeller 140, 150 is used as a part of the rotor 122, so that the rotor ( 122, the space required is reduced so that the overall size of the compressor can be miniaturized, there is also a side effect of reducing the manufacturing cost by reducing the number of parts required.

As described above, the turbocompressor of the present invention arranges an impeller close to both sides of the drive motor, mounts a magnet inserted into the rotating plate of the driving motor on the rear surface of the impeller, and utilizes the impeller as a part of the rotating plate of the driving motor. By arranging radial bearings and thrust bearings on both outer sides of the impeller, the number of rotating plates of the drive motor is reduced, thereby reducing the overall size of the compressor, and reducing the number of parts by the number of rotating plates, thereby reducing manufacturing costs. have.

Claims (2)

A hermetically sealed container having a first compression chamber having a suction port and a second compression chamber having a discharge port formed on both sides thereof so as to communicate with each other, and a motor chamber formed between the two compression chambers; An axial type drive motor mounted inside the motor chamber to generate a driving force; A drive shaft coupled to the mover of the drive motor to transmit a driving force while rotating; An impeller coupled to both ends of the drive shaft so as to correspond to both stators of the drive motor, and inserted into each compression chamber, and a plurality of rotor magnets mounted on each rear surface of the drive motor facing each other; Radial bearings disposed on an outer side of the impeller to support a driving shaft in a radial direction; A turbocompressor comprising a thrust bearing that is also disposed outside of the impeller and axially supports the drive shaft. The turbocompressor as claimed in claim 1, wherein the thrust bearing is disposed only outside one of the impellers of the two impellers.

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