KR102268282B1 - Turbo compressor and Refrigerating device having the same - Google Patents

Abstract

The present invention includes a motor housing; a stator disposed inside the motor housing; a rotor rotatably disposed inside the stator; a shaft on which a rotor is installed; an impeller installed on the shaft; a bearing housing coupled to the motor housing; a thrust collar installed on the shaft; a first air foil bearing positioned between one surface of the thrust collar and the bearing housing; a sealing member installed on the bearing housing; a second air foil bearing positioned between the other surface of the thrust collar and the sealing member; Including the acceleration sensor installed on the outer periphery of the bearing housing, there is an advantage that the acceleration sensor installed on the outer periphery of the bearing housing can efficiently detect excessive vibration of the bearing housing generated when the airfoil bearing is abnormal.

Description

Turbo compressor and refrigerator having the same

The present invention relates to a turbocompressor and a refrigerator having the same, and more particularly, to a turbocompressor equipped with an airfoil bearing and a refrigerator having the same.

In general, chillers can be divided into absorption chillers and vapor compression chillers.

A vapor compression type refrigerator can compress a refrigerant using a compressor, and includes a condenser for condensing the refrigerant compressed in the compressor, an expansion mechanism for expanding the refrigerant condensed in the condenser, and an evaporator for evaporating the refrigerant expanded from the expansion mechanism may include

A turbo compressor among centrifugal compressors may be used as the compressor of the vapor compression refrigerator, and in this case, the refrigerant evaporated in the evaporator may be introduced into the turbo compressor and compressed, and the refrigerant compressed in the turbo compressor may flow to the condenser and evaporate have.

The turbo compressor may be composed of a motor unit that generates power, and a compression mechanism unit (hereinafter referred to as a compression unit) that sucks and compresses refrigerant by the driving force transmitted from the motor unit, and converts kinetic energy generated from the motor unit into static pressure. While converting, the refrigerant can be discharged in a high pressure state.

The turbocompressor may include a radial bearing for radially supporting the shaft of the motor unit, and a thrust bearing for supporting the shaft in the axial direction.

US 2004/0179947 A1 (09.16,2004)

In the compressor according to the prior art, an encoder disk installed inside the compressor senses the speed of the rotary assembly, and a controller communicating with the encoder disk controls the number of rotations of the rotary assembly based on data sensed by the encoder disk, but the encoder disk There is a problem in that it is not easy to detect whether the thrust bearing is abnormal through the speed detection of the rotating assembly.

The present invention includes a motor housing; a stator disposed inside the motor housing; a rotor rotatably disposed inside the stator; a shaft on which the rotor is installed; a first bearing housing coupled to one side of the motor housing; a first compression unit installed in the first bearing housing; a first impeller installed on the shaft to be positioned inside the first compression unit; a second bearing housing coupled to the other side of the motor housing; a second compression unit installed on the second bearing housing; a second sealing member installed on the second bearing housing; a second impeller installed on the shaft to be positioned inside the second compression unit; a connecting tube connecting the first compression unit and the second compression unit; a thrust collar installed on the shaft; a first airfoil bearing positioned between one surface of the thrust collar and the second bearing housing; a second sealing member installed on the second bearing housing; a second air foil bearing positioned between the second surface of the thrust collar and the second sealing member; and an acceleration sensor installed on the outer periphery of the second bearing housing.

The acceleration sensor may be installed on an outer circumference of the second bearing housing in a radial direction of the thrust collar.

The acceleration sensor may be installed at a position where an extension line extending in a radial direction from the trust collar crosses the outer circumference of the second bearing housing.

The present invention includes a motor housing; a stator disposed inside the motor housing; a rotor rotatably disposed inside the stator; a shaft on which the rotor is installed; an impeller installed on the shaft; a bearing housing coupled to the motor housing; a thrust collar installed on the shaft; a first air foil bearing positioned between one surface of the thrust collar and the bearing housing; a sealing member installed on the bearing housing; a second air foil bearing positioned between the other surface of the thrust collar and the sealing member; and an acceleration sensor installed on the outer periphery of the bearing housing.

The present invention is a turbo compressor for compressing a refrigerant; a condenser condensing the refrigerant compressed in the turbocompressor; an expansion mechanism for expanding the refrigerant condensed in the condenser; an evaporator for evaporating the refrigerant expanded by the expansion mechanism; a controller for controlling the compressor, wherein the turbocompressor includes: a motor housing; a stator disposed inside the motor housing; a rotor rotatably disposed inside the stator; a shaft on which the rotor is installed; an impeller installed on the shaft; a bearing housing coupled to the motor housing; a thrust collar installed on the shaft; a first air foil bearing positioned between one surface of the thrust collar and the bearing housing; a sealing member installed on the bearing housing; a second air foil bearing positioned between the other surface of the thrust collar and the sealing member; and an acceleration sensor installed on the outer periphery of the bearing housing.

The acceleration sensor may be installed on an outer circumference of the bearing housing in a radial direction of the thrust collar.

The acceleration sensor may be installed at a position where an extension line extending in a radial direction from the thrust collar crosses the outer circumference of the bearing housing.

An accommodating groove for rotatably receiving the thrust collar may be formed on one surface of the bearing housing, and in the acceleration sensor, an extension line extending in a radial direction of the bearing housing from the accommodating groove among the outer circumference of the bearing housing cross It can be installed in a location where

The bearing housing may include a plate coupled to the motor housing and a cylindrical portion disposed to protrude from the plate to surround a portion of the shaft, wherein a third air foil bearing supporting the shaft is installed in the cylindrical portion In addition, the acceleration sensor may be installed on the outer periphery of the plate.

The controller may stop the compressor when the detection value of the acceleration sensor is in an abnormal range higher than the normal range.

When the detection value of the acceleration sensor is in an abnormal range higher than a normal range, the controller may notify an abnormality of the compressor through a notification mechanism.

The present invention has the advantage that the acceleration sensor installed on the outer periphery of the bearing housing can efficiently detect the excessive vibration of the bearing housing generated when the air foil bearing is abnormal.

In addition, since the acceleration sensor is installed on the outer periphery of the bearing housing, there is an advantage in that the installation and service of the acceleration sensor are easy.

In addition, there is an advantage that the acceleration sensor is not affected by the high temperature inside the motor housing, and can more accurately detect the vibration value of the bearing housing.

1 is a diagram showing the configuration of an embodiment of a refrigerator having a turbocompressor according to the present invention;
2 is a cross-sectional view showing an embodiment of a turbocompressor according to the present invention;
FIG. 3 is an enlarged cross-sectional view of part A shown in FIG. 2 .

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram showing the configuration of an embodiment of a refrigerator having a turbocompressor according to the present invention, FIG. 2 is a cross-sectional view showing an embodiment of a turbocompressor according to the present invention, and FIG. 3 is an enlarged view of part A shown in FIG. It is a cross section.

A refrigerator having a turbocompressor includes: a turbocompressor (1) for compressing a refrigerant; a condenser (2) connected to the turbo compressor (1) by a refrigerant line and condensing the refrigerant compressed in the turbo compressor (1); an expansion mechanism (3) connected to the condenser (2) and a refrigerant line to expand the refrigerant condensed in the condenser (2); It includes an evaporator (4) connected to the expansion mechanism (3) and a refrigerant line to evaporate the refrigerant expanded in the expansion mechanism (3), and a control unit (5) for controlling the turbocompressor (1).

The condenser 2 includes a cooling water inlet line 2A through which the cooling water cooled by a cooling tower, etc. flows into the condenser 2, and a cooling water outlet line 2B through which the cooling water exchanged with the refrigerant in the condenser 2 moves to the cooling tower, etc. can be connected

The expansion mechanism 3 may be composed of a capillary tube or an electronic expansion valve with a variable opening degree. When the expansion mechanism 3 is configured as an electromagnetic expansion valve, the opening of the expansion mechanism 3 may be controlled by the control unit 5 .

In the evaporator 4, a cold water inlet line 4A through which the cold water to be cooled by the evaporator 4 flows into the evaporator 4, and the cold water cooled while exchanging heat with the refrigerant in the evaporator 4 is installed in a building cooling pipe or air conditioning A cold water export line 4B that moves to a cold water demand destination such as a unit may be connected.

The control unit 5 may be mounted on the turbocompressor 1 . The controller 5 may be connected to an acceleration sensor 78 to be described later installed in the turbocompressor 1 and a signal line 79 .

The control unit 5 may detect whether the turbo compressor 1 is abnormal according to the detected value detected by the acceleration sensor 78, and when it is determined that the turbo compressor 1 is abnormal, the turbo compressor 1 ) can be stopped. When the value detected by the acceleration sensor 78 is in an abnormal range higher than the normal range, the controller 5 may stop the compressor 1 .

The control unit 5 may detect whether the turbo compressor 1 is abnormal according to the detected value detected by the acceleration sensor 78, and when it is determined that the turbo compressor 1 is abnormal, the turbo compressor 1 is abnormal. can be notified through the notification mechanism (6). Here, the notification mechanism 6 may be configured as a display for displaying information on the refrigerator, or as a buzzer for notifying the information of the refrigerator to the outside.

When the detection value of the acceleration sensor 78 is in an abnormal range higher than the normal range, the control unit 5 may notify the abnormality of the turbo compressor 1 to the notification mechanism 6 .

Hereinafter, the turbo compressor 1 will be described as follows.

In the turbocompressor 1 , the motor unit M may operate the compression unit C. In the turbocompressor 1 , one motor unit M may operate the two compression units C1 and C2 , and in this case, the turbocompressor 1 is a first motor unit M installed on one side of the motor unit M. It may include a compression unit (C1) and a second compression unit (C2) installed on the other side of the motor unit (M). When the turbocompressor includes two compression units C1 and C2, the two compression units C1 and C2 may be symmetrically disposed with the motor unit M interposed therebetween. After the refrigerant of the refrigerator having a turbocompressor is evaporated in the evaporator 4 , it is compressed in two compression units C1 and C2 , and then may flow to the condenser 2 .

The two compression units C1 and C2 may be configured such that the gas refrigerant compressed in the first compression unit C1 is compressed by the second compression unit C2. The first compression unit C1 and the second compression unit C2 may be connected to each other by a refrigerant tube such as a refrigerant pipe. The refrigerant compressed primarily in the first compression unit C1 of the two compression units C1 and C2 flows into the second compression unit C2 of the two compression units C1 and C2 to be subjected to secondary compression It is possible to be, and the refrigerant compressed in multiple stages by the two compression units C1 and C2 may flow to the condenser 2 . Of course, the two compression units C1 and C2 may be connected in parallel.

The turbocompressor 1 includes a motor housing 10; a stator 20 disposed inside the motor housing 10; a rotor 30 rotatably disposed inside the stator 10; It includes a shaft 40 on which the rotor 20 is installed and an impeller 90 installed on the shaft 40 .

The turbocompressor (1) includes a bearing housing (50) coupled to a motor housing (2); a thrust collar 70 installed on the shaft 30; a first airfoil bearing 72 positioned between one surface of the thrust collar 70 and the bearing housing 50; a sealing member 74 installed in the bearing housing 50; a second air foil bearing 76 positioned between the other surface of the thrust collar 70 and the sealing member 74; and an acceleration sensor 78 installed on the outer periphery of the bearing housing 50 .

Motor housing 10, stator 20, rotor 30, shaft 40, bearing housing 50, thrust collar 70, first airfoil bearing 72, seal The member 74 , the second airfoil bearing 76 , and the acceleration sensor 78 installed on the outer periphery of the bearing housing 50 may constitute the motor unit M .

The motor housing 10 may be a motor outer case that forms the exterior of the motor unit M. The motor housing 10 may have a flange 14 formed on the hollow cylindrical body 13 .

A space in which the stator 20 and the rotor 30 can be accommodated may be formed in the hollow cylindrical body 13 . In the hollow cylindrical body 13, a branch 15 having a hole through which an electric wire or the like can pass may be formed to protrude. A cover 16 covering the branch 15 may be coupled to the motor housing 12 . An installation hole 18 in which the power terminal block 17 is installed may be formed in the cover 16 .

The flange 14 may be formed larger than the hollow cylindrical body 13 . The flange 14 may be formed in the shape of a hollow disk body, and may be a bearing housing mounting plate to which the bearing housing 50 is closely attached and coupled.

When the turbocompressor 1 includes two compression parts C1 and C2, the turbocompressor 1 may include two bearing housings 50A and 50B. The first bearing housing 50A among the two bearing housings 50A and 50B may be coupled to one side of the motor housing 12, and the second bearing housing 50B among the two bearing housings 50A and 50B. may be coupled to the other side of the motor housing 12 .

The flange 14 may be formed at one end and the other end of the hollow cylindrical body 13 , respectively. The motor housing 12 may include a first flange 14A formed on one end of the hollow cylindrical body 13 and a second flange 14B formed on the other end of the hollow cylindrical body 13 . A first bearing housing 50A may be coupled to the first flange 14A, and a second bearing housing 50B may be coupled to the second flange 14B.

The stator 20 may be installed to be positioned inside the motor housing 10 . The stator 20 may be formed in a hollow cylindrical shape. The stator 20 may receive power from the outside to form a magnetic field. The stator 20 may have a coil wound around an iron core. The stator 20 may be connected to the power terminal block 17 by an electric wire to receive power from the power terminal block 17 .

The rotor 30 may be installed on the outer circumference of the shaft 40 , and may be installed at a position facing the stator 20 among the outer circumference of the shaft 40 . The rotor 30 may be rotated at a high speed by the stator 20 and the induced magnetic field. In the turbocompressor, the motor unit M may be a BLDC motor, and the rotor 30 may be rotated by an induced magnetic field induced in the stator 20 . The rotor 30 may include a magnet that may have a shorter length than the shaft 40 , and a magnet holder for fixing the magnet to the shaft 30 .

The shaft 40 may rotate together with the rotor 30 when the rotor 30 rotates. The shaft 40 may be formed to be longer than the rotor 30 . The shaft 40 may be formed to be longer than the motor housing 10 . One end 41 and the other end 42 of the shaft 40 may be located outside the motor housing 10 , respectively. When the turbocompressor 1 includes two compression parts C1 and C2, as shown in FIG. 1 , one end 41 of the shaft 40 is one of the two compression parts C1 and C2. It may extend into the first compression part C1, and the other end 42 of the shaft 40 may extend into the inside of the second compression part C2 among the two compression parts C1 and C2. .

The turbocompressor 1 may include at least one bearing supporting the shaft 30 , and the bearing housing 50 may support and protect these bearings.

When the turbocompressor 1 includes two compression parts C1 and C2 , two bearing housings 50 may be installed in the motor housing 10 . The bearing housing 50 may include a first bearing housing 50A coupled to the first flange 14A, and a second bearing housing 50B coupled to the second flange 14B. Hereinafter, the common configuration of the first bearing housing 50A and the second bearing housing 50B will be referred to as the bearing housing 50 and will be described separately, the first bearing housing 50A and the second bearing housing 50A. It is referred to as (50B) and described.

The bearing housing 50 may include a plate 52 coupled to the motor housing 50 , and a cylindrical portion 54 disposed to protrude from the plate 52 to surround a portion of the shaft 40 .

The cylindrical portion 54 may be integrally formed with the plate 52 . The cylindrical portion 54 is composed of a bearing bush of a hollow cylindrical shape formed separately from the plate 52 , and of course it is also possible to be fastened to the plate 52 . The cylindrical portion 54 may be formed to protrude from the plate 52 toward the rotor 30 .

A third air foil bearing 60 supporting the shaft 40 may be installed in the cylindrical portion 54 . The third air foil bearing 60 may rotatably support the shaft 40 between the shaft 40 and the cylindrical portion 54 . In the turbocompressor, a plurality of third air foil bearings 60 may support the shaft 30 . The third air foil bearing 60 may be installed in the cylindrical portion 54 of the first bearing housing 50A and the cylindrical portion 54 of the second bearing housing 50B, respectively.

The third air foil bearing 60 may include a plurality of foils having a thin plate shape, and the shaft 40 may be supported by a working gas or air layer between the plurality of foils and the shaft 30 during rotation. Each of the plurality of foils may include a fitting portion fixed by being fitted in a fitting groove formed on the inner circumference of the cylindrical portion 54, and a support portion extending from the fitting portion and having a curved surface.

The impeller 90 may be installed at the end of the shaft 30 and rotate together with the shaft 40 when the shaft 30 rotates. A plurality of impellers 90 may be installed in the turbocompressor.

The turbocompressor 1 may be configured as a two-stage turbocompressor in which a plurality of impellers 90 compress the refrigerant in multiple stages. In the turbocompressor 1 , an impeller 90 may be installed at one end 41 and the other end 42 of the shaft 40 , respectively. The turbocompressor 1 may include a first impeller 90A installed at one end of the shaft 40 and a second impeller 90B installed at the other end of the shaft 40 . The first impeller 90A may be installed on the shaft 40 to be positioned inside the first compression unit C1. In addition, the second impeller 90B may be installed on the shaft 40 to be positioned inside the second compression unit C2.

The turbocompressor 1 includes an inlet guide 100 for guiding the gas refrigerant to the impeller 90, and a diffuser 110 for converting the kinetic energy of the refrigerant gas flowed by the rotation of the impeller 90 into pressure energy, It may include a volute housing 120 having a volute channel 118 in which air flowed by the impeller 90 is collected.

When the turbocompressor 1 includes two compression units C1 and C2, each compression unit C1 and C2 includes the inlet guide 100, the diffuser 110, and the volute housing 120. may include

The first compression unit C1 includes a first inlet guide 100A for guiding the gas refrigerant to the first impeller 90A, and converting the kinetic energy of the refrigerant gas flowed by the first impeller 90A into pressure energy. It may include a first diffuser 110A and a first volute housing 120A in which a first volute channel 118A in which air flowed by the first impeller 90A is collected is formed.

And, the second compression unit (C2) is a second inlet guide (100B) for guiding the gas refrigerant to the second impeller (90B), and the kinetic energy of the refrigerant gas flowed by the second impeller (90B) into pressure energy. It may include a second diffuser 110B for converting, and a second volute housing 120B in which a second volute channel 118B for collecting air flowed by the second impeller 90B is formed.

The bearing housing 50 may have an accommodating groove 58 in which the thrust collar 70 is rotatably accommodated on one surface thereof. The receiving groove 58 may be formed on one surface of the plater 52 . The receiving groove 58 may be formed in a shape recessed in the opposite surface 52B of the surface 52A of the plater 52 facing the inside of the motor housing 10 . The receiving groove 58 may be formed to be larger than the thrust collar 70 .

When the turbo compressor 1 includes the two compression parts C1 and C2, the receiving groove 58 may be formed in only one of the two bearing housings 50A and 50B. The receiving groove 58 may not be formed in the bearing housing 50A adjacent to the first compression part C1, but may be formed in the bearing housing 50B adjacent to the second compression part C2.

The thrust collar 70 is installed on the shaft 40 to secure a thrust support area, and may be formed to be larger than the shaft 40 . The thrust collar 70 may be formed in a disk shape. The thrust collar 70 may be installed to protrude in a direction perpendicular to the longitudinal direction of the shaft 40 on the outer periphery of the shaft 40 . The thrust collar 70 may have one surface 70A facing the first air foil bearing 72 , and the other surface 70B may facing the second air foil bearing 74 .

The first airfoil bearing 72 may axially support the thrust collar 70 at a position spaced apart from the second airfoil bearing 76 .

The first air foil bearing 72 may include a plurality of foils having a thin plate shape installed on the plate 52 . The thrust collar 70 may be supported by a working gas or air layer between the plurality of foils of the first air foil bearing 72 and one surface 70A of the thrust collar 70 during rotation. The first air foil bearing 72 may be inserted into the receiving groove 58 of the plate 52 to be fastened to the plate 52 .

The sealing member 74 may be installed on the plate 52 of the bearing housing 50 . The sealing member 74 may include a labyrinth seal installed on the opposite surface 52B of the surface 52A facing the inside of the motor housing 10 among both surfaces of the plate 52 . When the turbo compressor 1 includes a plurality of compression units C1 and C2, the sealing member 74 may be provided for each compression unit C, and any one of the plurality of compression units M and The first compression unit C1 may be sealed, and the other of the plurality may be sealed between the motor unit M and the second compression unit C2. The turbo compressor (1) includes a first sealing member (74A) installed in a first bearing housing (50A); and a second sealing member (74B) installed on the second bearing housing (50B).

The second air foil bearing 76 may be axially spaced apart from the first air foil bearing 72 . The second air foil bearing 76 may be spaced apart from the first air foil bearing 72 with the thrust collar 130 interposed therebetween.

The second air foil bearing 76 may include a plurality of foils having a thin plate shape installed on the sealing member 74 . When the turbo compressor 1 includes two compression parts C1 and C2, the second air foil bearing 86 may be positioned between the other surface of the thrust collar 130 and the second sealing member 74B. have. The second air foil bearing 86 may be installed on the second sealing member 74B. In the sealing member 74B in which the second air foil bearing 76 is installed, a receiving groove 75 in which a plurality of foils are accommodated and mounted may be formed. The thrust collar 70 may be supported by a working gas or air layer between the plurality of foils of the second air foil bearing 76 and the other surface 70B of the thrust collar 70 during rotation.

The rotor 30 , the shaft 40 , and the thrust collar 70 may be a rotating assembly that is rotated when the turbocompressor 1 is driven.

When at least one of the first airfoil bearing 72 and the second airfoil bearing 74 is faulty, the rotating assembly comes into contact with the thin plate of the airfoil bearing while rotating at high speed, and at this time, the vibration in the circumferential direction is occurs This vibration may be transmitted to the bearing housing 50 and may be measured by the acceleration sensor 78 . When the turbocompressor 1 includes two compression parts C1 and C2, the vibration in the circumferential direction may be transmitted to the second bearing housing 50B, and the vibration may be transmitted to the second bearing housing 50B. It can be measured by an installed acceleration sensor 78 .

The acceleration sensor 78 may be installed outside the thrust collar 70 in the radial direction among the outer circumference 53 of the bearing housing 50 . When the turbocompressor 1 includes two compression parts C1 and C2, the acceleration sensor 78 is not installed in the first bearing housing 50A, but may be installed in the second bearing housing 50B. have.

The acceleration sensor 78 is mounted on the bearing housing 50 and can measure the intensity of acceleration or impact of the bearing housing 50 when the bearing housing 50 vibrates, such as inertial type, gyro type, silicon semiconductor type, etc. Various kinds of can be used. The acceleration sensor 78 may be exposed to the outside of the turbocompressor 1, and its installation or service may be easy.

The acceleration sensor 78 may be installed at a position where an extension line P1 extending in a radial direction from the thrust collar 70 intersects among the outer circumference 53 of the bearing housing 50 . When the turbocompressor 1 includes two compression parts C1 and C2, the acceleration sensor 78 radially moves from the thrust collar 70 of the outer circumference 53 of the second bearing housing 50 in the radial direction. It may be installed at a position where the extended extension lines P1 intersect.

The acceleration sensor 78 may be installed at a position where the extension line P2 extending in the radial direction of the bearing housing 50 intersects in the receiving groove 58 among the outer circumference 53 of the bearing housing 50 . When the turbo compressor (1) includes two compression parts (C1) and (C2), the acceleration sensor 78 is located in the receiving groove 58 of the outer circumference 53 of the second bearing housing 50 in the bearing housing ( 50) may be installed at a position where the extension lines P2 extending in the radial direction intersect.

The extension line P1 extending in the radial direction from the thrust collar 70 and the extension line P2 extending in the radial direction of the bearing housing 50 from the receiving groove 58 can coincide, and are parallel with a small interval. Of course it is also possible.

The extension line P1 extending in the radial direction from the thrust collar 70 and the extension line P2 extending in the radial direction of the bearing housing 50 from the receiving groove 58 are both the plate 52 of the bearing housing 50 . can be located in

The acceleration sensor 78 may be installed on the outer periphery of the plate 52 . When the turbocompressor 1 includes two compression parts C1 and C2 , the acceleration sensor 78 may be installed on the outer circumference 53 of the plate 52 of the second bearing housing 50 . The outer circumference 53 of the plate 52 may be a plane perpendicular to the thrust collar 70 , and the acceleration sensor 78 installed on the outer circumference 53 of the plate 52 detects vibration caused by abnormality in the air foil bearing. can do.

Hereinafter, the operation of the present invention configured as described above will be described as follows.

First, the turbo compressor 1 can be started, and when the turbo compressor 1 is started, the motor M is driven to rotate the rotor 30, the shaft 40, and the rotating assembly of the thrust collar 70. can

The rotational speed of the rotational assembly can be gradually increased, and when the rotational assembly rotates at a high speed, the thrust collar 70 is formed by the working fluid or air layer between the first airfoil bearing 72 and the first airfoil bearing 72. may be spaced apart from the plurality of thin plates of the second air foil bearing 76 and may be spaced apart from the plurality of thin plates of the second air foil bearing 76 by the working fluid or air layer therebetween.

When the first airfoil bearing 72 and the second airfoil bearing 74 are normal, the thrust collar 70 is separated from the first airfoil bearing 72 and the second airfoil bearing 76 at high speed. It may be rotated, and at this time, the vibration of the bearing housing 50 may be in a normal range.

On the other hand, when at least one of the first airfoil bearing 72 and the second airfoil bearing 74 is abnormal, the thrust collar 70 is selected from among the first airfoil bearing 72 and the second airfoil bearing 74 . It rubs against at least one in the circumferential direction, and at this time, vibrations above the normal range may be transmitted to the bearing housing 50 .

When the turbocompressor 1 is started, the acceleration sensor 78 may periodically sense the vibration value of the bearing housing 50 and output it to the controller 5 .

The control unit 5 determines whether the vibration value detected by the acceleration sensor 78 is in an abnormal range when a set time has elapsed after the turbo compressor 1 is started or the rotational speed of the shaft 40 is greater than or equal to the set speed.

When the vibration value detected by the acceleration sensor 78 is within an abnormal range, the controller 5 may stop the turbo compressor 1 or notify the abnormality of the turbo compressor 1 with the notification mechanism 6 .

On the other hand, the present invention is not limited to the above embodiments, and various modifications are possible within the technical scope to which the present invention belongs.

1: Turbocompressor 2: Condenser
3: Expansion mechanism 4: Evaporator
5: control unit 6: notification mechanism
10: motor housing 20: stator
30: rotor 40: shaft
50: bearing housing 52: plate
54: cylindrical portion 70: trust collar
72: first air foil bearing 74: sealing member
76: second air foil bearing 78: acceleration sensor

Claims (15)

a motor housing;
a stator disposed inside the motor housing;
a rotor rotatably disposed inside the stator;
a shaft on which the rotor is installed;
a first bearing housing coupled to one side of the motor housing;
a first sealing member installed on the first bearing housing;
a first compression unit installed in the first bearing housing;
a first impeller installed on the shaft to be positioned inside the first compression unit;
a second bearing housing coupled to the other side of the motor housing;
a second sealing member installed on the second bearing housing;
a second compression unit installed on the second bearing housing;
a second impeller installed on the shaft to be positioned inside the second compression unit;
a connecting tube connecting the first compression unit and the second compression unit;
a disc-shaped thrust collar installed on the shaft;
a first airfoil bearing positioned between one surface of the thrust collar and the second bearing housing;
a second air foil bearing positioned between the second surface of the thrust collar and the second sealing member;
The second bearing housing is installed on the radially outer side of the thrust collar among the outer circumference of the second bearing housing, and when at least one of the first air foil bearing and the second air foil bearing is abnormal, the abnormal vibration value of the second bearing housing an accelerometer to detect
The thrust collar is disposed to be spaced apart from the first air foil bearing and the second air foil bearing, respectively;
The acceleration sensor is disposed to be exposed to the outside, and is installed at a position where an extension line extending in a radial direction from the thrust collar crosses the outer circumference of the second bearing housing. delete delete a motor housing;
a stator disposed inside the motor housing;
a rotor rotatably disposed inside the stator;
a shaft on which the rotor is installed;
an impeller installed on the shaft;
a bearing housing coupled to the motor housing;
a disc-shaped thrust collar installed on the shaft;
a first air foil bearing positioned between one surface of the thrust collar and the bearing housing;
a sealing member installed in the bearing housing;
a second air foil bearing positioned between the other surface of the thrust collar and the sealing member;
Acceleration that is installed outside the outer circumference of the bearing housing in the radial direction of the thrust collar and detects an abnormal vibration value of the bearing housing when at least one of the first air foil bearing and the second air foil bearing is abnormal including a sensor,
The thrust collar is disposed to be spaced apart from the first air foil bearing and the second air foil bearing, respectively;
The acceleration sensor is disposed to be exposed to the outside, and is installed at a position where an extension line extending in a radial direction from the thrust collar crosses the outer circumference of the bearing housing. delete delete 5. The method of claim 4,
The bearing housing has a receiving groove formed on one surface in which the thrust collar is rotatably accommodated,
The acceleration sensor is installed at a position where an extension line extending in a radial direction of the bearing housing intersects in the receiving groove among the outer circumferences of the bearing housing. 5. The method of claim 4,
The bearing housing includes a plate coupled to the motor housing, and a cylindrical portion disposed to protrude from the plate to surround a portion of the shaft,
A third air foil bearing for supporting the shaft is installed in the cylindrical portion,
The acceleration sensor is a turbocompressor installed on the outer periphery of the plate. a turbo compressor for compressing the refrigerant;
a condenser for condensing the refrigerant compressed in the turbocompressor;
an expansion mechanism for expanding the refrigerant condensed in the condenser;
an evaporator for evaporating the refrigerant expanded by the expansion mechanism;
A control unit for controlling the turbocompressor,
The turbo compressor
a motor housing;
a stator disposed inside the motor housing;
a rotor rotatably disposed inside the stator;
a shaft on which the rotor is installed;
an impeller installed on the shaft;
a bearing housing coupled to the motor housing;
a disc-shaped thrust collar installed on the shaft;
a first air foil bearing positioned between one surface of the thrust collar and the bearing housing;
a sealing member installed on the bearing housing;
a second air foil bearing positioned between the other surface of the thrust collar and the sealing member;
Acceleration that is installed outside the outer circumference of the bearing housing in the radial direction of the thrust collar and detects an abnormal vibration value of the bearing housing when at least one of the first air foil bearing and the second air foil bearing is abnormal including a sensor,
The thrust collar is disposed to be spaced apart from the first air foil bearing and the second air foil bearing, respectively;
The acceleration sensor is disposed to be exposed to the outside, and the turbocompressor is installed at a position where an extension line extending in a radial direction from the thrust collar intersects among the outer circumferences of the bearing housing. delete delete 10. The method of claim 9,
The bearing housing has a receiving groove formed on one surface in which the thrust collar is rotatably accommodated,
The acceleration sensor is a refrigerator having a turbocompressor installed at a position where an extension line extending in a radial direction of the bearing housing intersects the receiving groove among the outer circumference of the bearing housing. 10. The method of claim 9,
The bearing housing includes a plate coupled to the motor housing, and a cylindrical portion disposed to protrude from the plate to surround a portion of the shaft,
A third air foil bearing for supporting the shaft is installed in the cylindrical portion,
The acceleration sensor is a refrigerator having a turbocompressor installed on the outer periphery of the plate. 10. The method of claim 9,
The controller having a turbocompressor stops the turbocompressor when the detection value of the acceleration sensor is in an abnormal range higher than the normal range. 10. The method of claim 9,
The control unit has a turbocompressor that notifies the abnormality of the turbocompressor to a notification mechanism when the detection value of the acceleration sensor is in an abnormal range higher than the normal range.

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