KR20170001295A - Compressor and Chiller system including it - Google Patents

Abstract

The present invention relates to a compressor and a chiller system comprising the same and, more specifically, relates to a compressor and a chiller system comprising the same. The compressor comprises: at least one impeller for inhaling a cooling medium in the axial direction to be compressed in the centrifugal direction; a rotational shaft formed to rotate the impeller; and a displacement sensor formed to detect the displacement of the rotational shaft. The displacement sensor includes a flexible circuit substrate, and a coil arranged on both sides of the flexible circuit substrate. The flexible circuit substrate is formed of a plurality of substrate units connected through at least one connection unit.

Description

Compressor and Chiller System Including It [0002]

The present invention relates to a compressor and a chiller system including the same, and more particularly, to a compressor having a gap sensor having an improved sensitivity and a chiller system including such a compressor.

Generally, a chiller system is a cooling device or a refrigerating device that supplies cold water to a cold water consumer such as an air conditioner or a freezer, and is configured to circulate the refrigerant through a compressor, a condenser, an expansion valve, and an evaporator.

The evaporator of the chiller system is a water-refrigerant heat exchanger, and is formed to cool the cold water by exchanging heat between the refrigerant passing through the evaporator and the cold-water exchanged in the heat exchanger of the air conditioner or the refrigerator.

The condenser of the chiller system is a water-refrigerant heat exchanger, and is configured to cool the refrigerant by exchanging heat between the refrigerant passing through the condenser and the cooling water heat-exchanged in the water-cooling apparatus.

In addition, the compressor of the chiller system is formed to compress the refrigerant and provide it to the condenser. The compressor may include an impeller for compressing the refrigerant, a rotating shaft connected to the impeller, and a motor for rotating the rotating shaft. The rotation shaft is formed to rotate inside the bearing housing.

At this time, if the rotary shaft rotates outside the predetermined position (for example, the center position of the inside of the bearing housing) inside the bearing housing, noise may be generated, compressor efficiency may be lowered, and compressor may be damaged.

Therefore, in order to control the position of the rotary shaft of the bearing housing, a displacement sensor for sensing the position of the rotary shaft is required.

On the other hand, the position of the rotary shaft can be more precisely controlled according to the sensitivity of the displacement sensor.

In this case, in order to increase the sensitivity of the displacement sensor, a method of increasing the number of turns of the coil (that is, the number of turns of the coil) may be considered. However, there is a limit in increasing the number of turns of the coil in the substrate of predetermined size.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a compressor and a chiller system capable of amplifying the sensitivity of a displacement sensor provided around a rotational axis of a compressor.

Another object of the present invention is to provide a compressor and a chiller system using a flexible circuit board as a displacement sensor and having a displacement sensor with improved spatial efficiency.

Another object of the present invention is to provide a compressor and a chiller system capable of more precisely controlling the position of the rotary shaft based on a difference in value sensed by a displacement sensor disposed around a rotary shaft of a compressor.

It is another object of the present invention to provide a compressor and a chiller system that can precisely control the position of the rotary shaft, reduce noise generated in the compressor, increase the compressor efficiency, and prevent the compressor from being damaged.

SUMMARY OF THE INVENTION The present invention has been accomplished to solve the above-mentioned problems, and it is an object of the present invention to provide a centrifugal compressor which comprises at least one impeller for sucking a refrigerant in an axial direction and compressing the refrigerant in a centrifugal direction; A rotating shaft configured to rotate the impeller; Wherein the displacement sensor includes a flexible circuit board and a coil disposed on both sides of the flexible circuit board, wherein the flexible circuit board is connected to the flexible circuit board via one or more heat connections And a plurality of the substrate units.

The plurality of substrate units may be stacked in a zigzag direction through bending of the at least one connection portion.

Further, the coils are arranged in a spiral shape on both sides of each of the substrate units, and each of the substrate units is provided with a via hole at a position corresponding to the radially inward end of the coil, and on one side of each substrate unit The radially inner end of the coil to be disposed may be connected to the radially inner end of the coil disposed on the other side of the respective substrate unit through the via hole.

In addition, in a state in which the plurality of substrate units are stacked, two substrate units located at the outermost periphery are connected to the neighboring substrate units by one connecting portion, and one or more substrate units located between the two outermost substrate units are And can be connected to neighboring substrate units by two connecting portions.

Further, in a state in which the plurality of the substrate units are stacked, any one of the radially outer ends of the coils disposed on the upper surface and the lower surface of each of the substrate units is connected to the upper surface and the lower surface of the adjacent substrate unit through the coils disposed on the connection portion. Can be connected to the radially outer end of any one of the coils disposed on the bottom surface.

On the other hand, the coils disposed on the connection portion may be formed in the form of a mesh.

The at least one connection portion and the plurality of substrate units may be integrally formed.

Also, at least a portion of the coil may be coated with an insulator.

The displacement sensor may further include a ferrite core coupled with the plurality of substrate units, wherein a coupling hole is formed at a central portion of the plurality of substrate units, and a coupling protrusion corresponding to the coupling hole is provided in the ferrite core .

The displacement sensor may be configured to sense the radial displacement of the rotation shaft.

In addition, a plurality of displacement sensors may be provided around the rotating shaft in a radial direction from the rotating shaft.

The plurality of displacement sensors may include a pair of displacement sensors arranged so as to face each other in the up-and-down direction with respect to the transverse section of the rotary shaft, and a pair of displacement sensors arranged to face each other in the direction perpendicular to the imaginary line connecting the pair of displacement sensors And may include another pair of displacement sensors disposed.

In addition, a position of the rotation axis in a vertical direction is determined through a first value, which is a difference of sensed values sensed by the pair of displacement sensors, and a second value, which is a difference of sensed values sensed by the other pair of displacement sensors, The position of the rotation shaft in the left-right direction can be determined.

Further, the chiller compressor according to an embodiment of the present invention may further include a controller electrically connected to the pair of displacement sensors and the pair of displacement sensors, wherein a magnetic bearing is disposed in a bearing housing surrounding the rotary shaft, The pair of displacement sensors and the pair of displacement sensors are installed at radial positions corresponding to the positions of the magnetic bearings with respect to the rotation axis, and the control unit determines, based on the first value and the second value, The magnetic bearing can be controlled such that the rotation axis in the bearing housing is located at a predetermined position in the bearing housing.

The present invention also provides a compressor comprising: at least one impeller for sucking a refrigerant in an axial direction and compressing the refrigerant in a centrifugal direction; a rotation shaft formed to rotate the impeller; and a displacement sensor configured to sense a displacement of the rotation shaft; A condenser for condensing the refrigerant by exchanging heat between the refrigerant compressed in the compressor and the cooling water; An expansion valve through which the refrigerant condensed in the condenser expands; And an evaporator for evaporating the refrigerant by exchanging heat between the refrigerant expanded in the expansion valve and the cold water, and cooling the cold water, wherein the displacement sensor includes a flexible circuit board and a coil disposed on both sides of the flexible circuit board, Wherein the flexible circuit board comprises a plurality of substrate units connected to each other through at least one heat connection.

At this time, the plurality of substrate units may be stacked in the zigzag direction through bending of the at least one connection portion.

Further, in a state in which the plurality of the substrate units are stacked, any one of the radially outer ends of the coils disposed on the upper surface and the lower surface of each of the substrate units is connected to the upper surface and the lower surface of the adjacent substrate unit through the coils disposed on the connection portion. Can be connected to the radially outer end of any one of the coils disposed on the bottom surface.

A plurality of displacement sensors are disposed around the rotating shaft in a radial direction around the rotating shaft. The plurality of displacement sensors include a pair of displacement sensors disposed so as to face each other in the vertical direction with respect to the transverse section of the rotating shaft And another pair of displacement sensors arranged to face each other in a direction perpendicular to a virtual line connecting the pair of displacement sensors.

In addition, a position of the rotation axis in a vertical direction is determined through a first value, which is a difference of sensed values sensed by the pair of displacement sensors, and a second value, which is a difference of sensed values sensed by the other pair of displacement sensors, The position of the rotation shaft in the left-right direction can be determined.

The chiller system according to an embodiment of the present invention may further include an air conditioning unit that cools the air in the air conditioning space by exchanging heat between the cold water cooled in the evaporator and the air in the air conditioning space.

According to the present invention, it is possible to provide a compressor and a chiller system in which the sensitivity of a displacement sensor provided around the rotational axis of the compressor is increased.

Further, according to the present invention, it is possible to provide a compressor and a chiller system using a flexible circuit board as the displacement sensor and having a displacement sensor with improved spatial efficiency.

In addition, according to the present invention, it is possible to provide a compressor and a chiller system capable of more precisely controlling the position of the rotary shaft based on a difference in the value sensed by the displacement sensor disposed around the rotary shaft of the compressor.

In addition, according to the present invention, it is possible to provide a compressor and a chiller system that can precisely control the position of the rotary shaft, reduce noise generated in the compressor, increase the compressor efficiency, and prevent the compressor from being damaged.

1 is a schematic view of a chiller system according to an embodiment of the present invention.
FIG. 2 is a conceptual view of a compressor included in the chiller system of FIG. 1. FIG.
FIG. 3 is a view schematically showing a displacement sensor provided in the chiller system of FIG. 1. FIG.
4 is a schematic cross-sectional view showing a state in which the displacement sensor shown in Fig. 3 is coupled to the ferrite core.
5 is a plan view schematically showing a state in which the flexible circuit board of the displacement sensor shown in Fig. 3 is opened.
Fig. 6 is a cross-sectional view schematically showing a state in which the displacement sensor of Fig. 3 is installed in the bearing housing of the compressor. Fig.
FIG. 7 is a block diagram illustrating a connection relationship of major components of a chiller system according to an embodiment of the present invention.

Hereinafter, a turbo refrigerator according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

In addition, the same or corresponding components are denoted by the same reference numerals regardless of the reference numerals, and redundant description thereof will be omitted. For convenience of explanation, the size and shape of each constituent member shown may be exaggerated or reduced have.

On the other hand, terms including an ordinal number such as a first or a second may be used to describe various elements, but the constituent elements are not limited by the terms, and the terms may refer to a constituent element from another constituent element It is used only for the purpose of discrimination.

1 is a schematic view of a chiller system according to an embodiment of the present invention.

Referring to FIG. 1, a chiller system 1 according to an embodiment of the present invention includes a compressor 10 configured to compress a refrigerant, a condenser 10 configured to heat-exchange refrigerant compressed in the compressor 10, An expansion valve 30 formed to expand the refrigerant condensed in the condenser 20 and a refrigerant expansion valve 30 for exchanging heat between the refrigerant expanded in the expansion valve 30 and the cold water to evaporate the refrigerant, And an evaporator 40 formed thereon.

The chiller system 1 according to the embodiment of the present invention includes an air conditioning unit 50 for cooling the air in the air conditioning space by exchanging heat between cold air cooled in the evaporator 40 and air in the air conditioning space, 20, a cooling unit 60 configured to cool the cooling water heat exchanged with the refrigerant.

The condenser 20 may be configured to discharge the heat of the refrigerant compressed in the compressor 10 toward the cooling water to condense the refrigerant. That is, the condenser 20 may be configured to heat-exchange the cooling water supplied from the cooling unit 60 and the refrigerant supplied through the compressor 10, in order to condense the refrigerant.

For example, the condenser 20 may be a shell-and-tube heat exchanger. At this time, a condensation space 210 in which the refrigerant can be condensed is formed in the shell of the condenser 20, and a cooling water tube 220 through which the cooling water passes may be disposed in the condensation space 210. The cooling water tube 220 may be connected to the cooling water inlet pipe 610 and the cooling water outlet pipe 620 of the cooling unit 60 so that the cooling water can flow.

The cooling unit (60) is formed to cool the cooling water that absorbs heat from the refrigerant of the condenser (20). The cooling unit 60 includes a cooling water inflow pipe 610 through which cooling water flows and a cooling water outflow pipe 620 through which cooling water flows out.

For example, the cooling unit 60 may be configured as a cooling tower to air-cool the cooling water that absorbs heat from the refrigerant of the condenser 20.

The cooling unit 60 includes a main body 630 having an air outlet 631 formed at an upper portion thereof and an air inlet 632 formed at a side thereof, A blowing fan (not shown) for forcibly discharging the outside air from the air outlet 631 after forcibly sucking the inside of the main body 630 into the inside of the main body 630 and the cooling water which is heat-exchanged in the condenser 20, And a cooling water collecting part for cooling the cooling water injected from the cooling water inflow pipe by being cooled by heat exchange between the cooling water and the outside air.

The evaporator 40 may be configured to supply heat to the refrigerant expanded in the expansion valve 30 to evaporate the refrigerant. That is, the evaporator 40 may be configured to exchange heat between the refrigerant and the cold water supplied from the air-conditioning unit 50 to evaporate the refrigerant.

For example, the evaporator 40 may be a shell-and-tube heat exchanger. At this time, an evaporation space 410 in which the refrigerant can evaporate may be formed in the shell of the evaporator 40. Also, a cold water tube 420 through which cold water passes may be disposed in the evaporation space 410. The cold water tube 420 may be connected to the cold water inlet pipe 510 and the cold water outlet pipe 520 connected to the air conditioning unit 50 so that cold water can flow.

The refrigerant vaporized in the evaporator 40 is sucked into the inflow pipe 70 of the compressor 10 and can be compressed by the compressor 10.

The air conditioning unit 50 includes a heat exchanger (not shown) for supplying heat to the refrigerant of the evaporator 40 to exchange heat between the cooled cold water and the air in the air space, A cold water inflow pipe 510 through which cold water flows into the evaporator 40 and a cold water outflow pipe 520 through which cold water flows out from the air conditioning unit 50 into the evaporator 40.

The compressor 10 may be configured to compress the refrigerant evaporated in the evaporator 40. For example, the compressor 10 may be formed of a turbo compressor. Also, the compressor 10 may be formed of a single stage compressor or a multi-stage compressor.

The configuration of the compressor 10 will be described in detail below with reference to other drawings.

2 is a conceptual diagram of a compressor 10 provided in the chiller system of FIG.

1 and 2, the compressor 10 according to the embodiment of the present invention includes at least one impeller 110 for sucking the refrigerant evaporated in the evaporator 40 in the axial direction and compressing the refrigerant in the centrifugal direction, A rotating shaft 120 configured to transmit rotational power to the impeller 110; a motor 130 rotating the rotating shaft 120; and a bearing housing 140 configured to support the rotating shaft 120.

The impeller 110 may be formed to suck the refrigerant in the axial direction and compress it in the centrifugal direction. The refrigerant compressed by the impeller 110 is supplied to the condenser 20.

The motor 130 may be configured to provide a driving force for rotating the impeller 110. At this time, the driving force of the motor 130 may be transmitted to the impeller 110 through the rotation shaft 120.

The bearing housing 140 may be formed to support the rotation shaft 120. For example, the bearing housing 130 may be formed to surround at least a part of the rotation shaft 120.

One or more magnetic bearings 141 and 142 may be installed in the bearing housing 140. For example, the magnetic bearings 141 and 142 may be provided at both longitudinal ends of the bearing housing 140, respectively. In other words, the magnetic bearings 141 and 142 may be installed in the bearing housing 140 in front of and behind the motor 130 with the motor 130 interposed therebetween.

For convenience of explanation, the magnetic bearing disposed on the front side of the motor 130 is referred to as a front magnetic bearing 141, and the magnetic bearing disposed on the rear side of the motor 130 is referred to as a rear magnetic bearing 142 ).

A plurality of the front magnetic bearings 141 and the rear magnetic bearings 142 may be provided. For example, the front magnetic bearing 141 may be provided as two pairs of magnetic bearings facing each other in a cross shape with the rotation shaft 120 interposed therebetween. Also, the rear magnetic bearing 142 may be provided as two pairs of magnetic bearings facing each other in a cross shape with the rotation shaft 120 interposed therebetween.

The magnetic bearings 141 and 142 may be controlled by a control unit to be described later. That is, the control unit controls the magnetic bearings 141 and 142 so that the rotary shaft 120 is positioned at a predetermined position inside the bearing housing 140.

Since the control of the position of the rotary shaft 120 through the control of the current or the contact pressure supplied to the magnetic bearings 141 and 142 is already well known in the art, a detailed description thereof will be omitted.

Also, one or more displacement sensors 81 and 82 may be installed in the bearing housing 140.

The displacement sensors 81 and 82 may be disposed adjacent to the magnetic bearings 141 and 142. For example, the displacement sensors 81 and 82 may be installed in the bearing housing 140 in front of or behind the magnetic bearings 141 and 142.

Specifically, the displacement sensor 80 may be installed in front of the front magnetic bearing 141 and rearward of the rear magnetic bearing 142, respectively. A displacement sensor disposed in front of the front magnetic bearing 141 is referred to as a front displacement sensor 81 and a displacement sensor disposed behind the rear magnetic bearing 142 is referred to as a rear displacement sensor 82 ).

At this time, the displacement sensors 81 and 82 may have the same number as the magnetic bearings 141 and 142. For example, the front displacement sensor 81 may be provided as two pairs of displacement sensors facing each other in a cross shape with the rotation axis 120 interposed therebetween. The rear displacement sensor 82 may also be provided as two pairs of displacement sensors facing each other in a cross shape with the rotation axis 120 interposed therebetween.

The displacement sensors 81 and 82 may be configured to sense the displacement of the rotation shaft 120. Specifically, it may be configured to sense the radial displacement of the rotating shaft 120 disposed inside the bearing housing 140.

That is, the displacement sensors 81 and 82 may be spaced apart from the rotation shaft 120 in the radial direction around the abductor shaft 120.

Therefore, if the sensitivity of the displacement sensors 81 and 82 is high, the position of the rotation shaft 120 can be precisely controlled.

In order to increase the sensitivity of the displacement sensors 81 and 82, a method of increasing the number of turns of the coils provided in the displacement sensors 81 and 82 (that is, the number of turns of the coils) may be considered.

However, there is a limit to increase the number of turns of coils arranged on a limited-size circuit board.

Hereinafter, specific constructions of the displacement sensors 81 and 82 for improving the sensitivity of the displacement sensors 81 and 82 will be described with reference to other drawings.

FIG. 3 is a schematic view showing a displacement sensor provided in the chiller system of FIG. 1, and FIG. 4 is a schematic sectional view showing a state where the displacement sensor shown in FIG. 3 is coupled to a ferrite core

3 and 4, displacement sensors 81 and 82 according to an embodiment of the present invention may include a circuit board 810 and coils 820 disposed on both sides of the circuit board 810 have.

The circuit board 810 may be formed of a flexible circuit board. In addition, the circuit board 810 may be formed of a plurality of substrate units 811 to 815 connected through one or more connecting portions 830.

At this time, the at least one connection unit 830 and the plurality of substrate units 811 and 815 may be integrally formed. That is, the at least one connection portion 830 and the plurality of substrate units 811 to 815 may be formed of a flexible material. In other words, the at least one connection portion 830 and the plurality of substrate units 811 to 815 can all function as flexible circuit boards.

The plurality of substrate units 811 to 815 may be stacked in the zigzag direction by bending the at least one connection unit 830.

The displacement sensors 81 and 82 may further include a ferrite core 840 coupled to the plurality of substrate units 811 to 815.

At this time, a coupling hole 816 is formed at the center of the plurality of substrate units 811 to 815 and a fastening protrusion 846 corresponding to the coupling hole 816 may be formed in the ferrite core 840 .

In addition, the ferrite core 840 may be formed with a recess 841 in which the plurality of substrate units 811 to 815 are seated.

For example, the plurality of substrate units 811 to 815 may be formed in the shape of a circular plate, and the recesses 841 may be formed in a shape corresponding to the plurality of substrate units 811 to 815 in a stacked state .

The ferrite core 840 may be formed of a ferrite material as a whole. Alternatively, the ferrite core 840 may be formed of ferrite material only in the fastening protrusion 846.

The inductance value of the coil 820 can be increased by the ferrite core 840 and the precision of the displacement sensors 81 and 82 can be increased.

On the other hand, since the coils 820 are disposed on both side surfaces of each of the plurality of the substrate units 811 to 815, there is a fear that the coils disposed on neighboring substrate units are in contact with each other and a short circuit is generated.

Thus, at least a portion of the coil 820 may be coated with an insulator to prevent shorts caused by contact of the coils disposed in neighboring substrate units.

For example, after the coils 820 are disposed on the plurality of substrate units 811 to 815, both sides of each of the plurality of the substrate units 811 to 815 may be coated with an insulator.

The coils 820 may be arranged in a spiral shape on both sides of the respective substrate units 811 to 815.

Here, the spiral shape may be defined as a curve in which the diameter is continuously increased or continuously decreased in diameter.

The coil 820 is continuously connected to the plurality of substrate units 811 to 815.

Hereinafter, with reference to other drawings, the arrangement structure of the coils for increasing the number of turns (the number of turns of the coils) of the coils 820 on the substrate units 811 to 815 of a limited size will be described.

5 is a plan view schematically showing a state in which the flexible circuit board of the displacement sensor shown in Fig. 3 is opened.

More specifically, the upper side of FIG. 5 shows the upper surface pattern of each of the plurality of substrate units 811 to 815, and the lower side of FIG. 5 shows the lower surface pattern of the plurality of substrate units 811 to 815 .

For convenience of explanation, the two substrate units located at the outermost sides of the plurality of substrate units 811 to 815 are denoted by a first substrate unit 811 and a fifth substrate unit 815, The second substrate unit 812, the third substrate unit 813, and the fourth substrate unit 814 may be referred to as the substrate units disposed between the first substrate unit 811 and the fifth substrate unit 815. [

Referring to FIGS. 3 to 5, as described above, the plurality of substrate units 811 to 815 may be sequentially stacked in the zigzag direction through bending of one or more connecting portions 830.

That is, when the plurality of substrate units 811 to 815 are stacked, the upper surface 811-1 of the first substrate unit 811 faces upward, and the lower surface 811-2 of the first substrate unit 811 Head downwards. Further, the lower surface 812-2 of the second substrate unit 812 faces upward and the upper surface 812-1 faces downward. Further, the upper surface 813-1 of the third substrate unit 813 faces upward, and the lower surface 813-2 faces downward. The upper surface 814-1 of the fourth substrate unit 814 faces downward, and the lower surface 814-2 of the fourth substrate unit 814 faces upward. Further, the upper surface 815-1 of the fifth substrate unit 815 faces upward, and the lower surface 815-2 faces downward.

The lower surface 811-2 of the first substrate unit 811 faces the lower surface 812-2 of the second substrate unit 812. [ The upper surface 812-1 of the second substrate unit 812 faces the upper surface 813-1 of the third substrate unit 813. [ The lower surface 813-2 of the third substrate unit 813 faces the lower surface 814-2 of the fourth substrate unit 814. [ The upper surface 814-1 of the fourth substrate unit 814 faces the upper surface 815-1 of the fifth substrate unit 815. [

On the other hand, in order to connect the coils 820 disposed on one side of each of the plurality of substrate units 811 through 815 to the coils 820 disposed on the other side, a plurality of substrate units 811 through 815 are provided with via holes H) may be formed.

That is, one end of the coil 820 disposed on one side of each of the plurality of substrate units 811 to 815 may be connected to one end of the coil 820 disposed on the other side through the via hole H.

Specifically, each of the substrate units 811 to 815 may be provided with the via hole H at a position corresponding to a radially inner end of the coil 820. [

A radially inner end of the coil 820 disposed on one side of each of the substrate units 811 to 815 is disposed on the other side of each of the substrate units 811 to 815 via the via hole H Lt; RTI ID = 0.0 > 820 < / RTI >

The radially inner end of the coil 820 disposed on the upper surface 811-1 of the first substrate unit 811 is connected to the lower surface 811-2 of the first substrate unit 811 via the via hole H. [ To the radially inner end of the coil 820,

In the state where the plurality of substrate units 811 to 815 are stacked, the two substrate units 811 and 815 located at the outermost periphery are connected to neighboring substrate units by one connection unit 830, One or more substrate units 812, 813, and 814 located between the outermost substrate units 811 and 815 may be connected to neighboring substrate units by two connection units 830, respectively.

For example, referring to FIG. 5, the first substrate unit 811 located at the uppermost position is connected to the second substrate unit 812 by one connection unit 830. The fifth substrate unit 815 located at the lowest position may be connected to the fourth substrate unit 814 by one connection unit 830.

The second substrate unit 812, the third substrate unit 813 and the fourth substrate unit 814 located between the first substrate unit 811 and the fifth substrate unit 815 are formed of two And may be connected to neighboring substrate units by a connection portion 820.

In the state where the plurality of substrate units 811 to 815 are stacked, any one of the radially outer ends of the coils 820 disposed on the upper and lower surfaces of the respective substrate units 811 to 815 is connected to the connecting portion 830 And the coils 820 disposed on the upper and lower surfaces of the neighboring substrate units 811 to 815 through the connection coil 831 disposed on the outer side of the coil unit 820. [

That is, any one of the coils 820 disposed on the upper surfaces 811-1 through 815-1 of the substrate units 811 through 815 and the coils 820 disposed on the lower surfaces 811-2 through 815-2 And a coil 820 disposed on the upper surfaces 811-1 through 815-1 of the adjacent substrate units 811 through 815 and a coil 820 disposed on the lower surfaces 811-2 through 815-2 820 may be connected through a connection coil 831 disposed on the connection portion 830. [

In other words, the connection coil 831 may be formed to connect the coils of the adjacent substrate units 811 to 815 with each other.

5, the radially outer end of the coil 820 disposed on the lower surface 811-2 of the first substrate unit 811 includes a connection coil 831 disposed on the connection portion 830, To the radially outer end of the coil 820 disposed on the lower surface 812-2 of the second substrate unit 812 through the first coil 812. [

The radially outer end of the coil 820 disposed on the upper surface 812-1 of the second substrate unit 812 is connected to the third substrate unit 813 through a connection coil 831 disposed on the connection portion 830 May be connected to a radially outer end of coil 820 disposed on top surface 813-1 of coil 820. [

The radially outer end of the coil 820 disposed on the lower surface 813-2 of the third substrate unit 813 is connected to the fourth substrate unit 810 via the connection coil 831 disposed on the connection portion 830. [ 814 may be connected to a radially outer end of the coil 820 disposed on the lower surface 814-2 of the coil 814. [

The radially outer end of the coil 820 disposed on the upper surface 814-1 of the fourth substrate unit 814 is connected to the fifth substrate unit 815 through a connection coil 831 disposed on the connection portion 830. [ To the radially outer end of the coil 820 disposed on the top surface 815-1 of the coil 820. [

As described above, according to the present invention, the connection of the coils 820 between the adjacent substrate units 811 to 815 is performed through the connection portion 830. Therefore, a separate via hole for connection of the coil 820 between the plurality of substrate units 811 to 815 to be stacked becomes unnecessary.

That is, only one via hole is formed in each of the substrate units 811 to 815 for coupling the coil disposed on the upper surface of each of the substrate units 811 to 815 and the coil disposed on the lower surface. Therefore, according to the present invention, the number of turns (the number of turns of the coil) of the coil 820 disposed in each of the substrate units 811 to 815 can be increased as compared with the case where a plurality of via holes are provided.

That is, according to the present invention, as the number of turns of the coil 820 increases, the sensitivity and precision of the displacement sensors 81 and 82 can be improved.

In addition, the connection coil 831 may be formed in a mesh form or a lattice form. That is, the connection coil 831 may be formed in a mesh or grid shape to prevent the connection coil 831 from breaking during the bending of the connection portion 830.

Therefore, even if a part of the connection coil 831 formed in the lattice shape is broken at the time of bending the connection portion 830, it is possible to prevent the connection coil 831 from breaking, and the connection of the neighboring substrate units 811 to 815 The coils 820 can be stably connected to each other.

On the other hand, in order to precisely control the position of the rotary shaft 120 provided in the compressor 10 based on the signals sensed by the displacement sensors 81 and 82, the arrangement of the displacement sensors 81 and 82, It is important to control the magnetic bearings 141 and 142 based on the values sensed by the sensors 81 and 82.

The preferred arrangement of the displacement sensors 81 and 82 and the control of the magnetic bearings 141 and 142 using the values sensed by the displacement sensors 81 and 82 will be described below with reference to other drawings.

FIG. 6 is a cross-sectional view schematically showing a state in which the displacement sensor of FIG. 3 is installed in the bearing housing of the compressor, and FIG. 7 is a block diagram showing a connection relationship of major components of the chiller system according to the embodiment of the present invention.

A plurality of displacement sensors 81 and 82 and magnetic bearings 141 and 142 may be provided on the front and rear sides of the motor 130 as described above with reference to FIG.

Hereinafter, for convenience of explanation, the displacement sensor 81 and the magnetic bearing 141 arranged on the front side of the motor 130 will be used as a reference. However, it is apparent that the following description can be equally applied to the displacement sensor 82 and the magnetic bearing 142 disposed rearward relative to the motor 130.

Referring to FIGS. 6 and 7, the bearing housing 140 may be provided with a plurality of displacement sensors 81. The plurality of displacement sensors 81 may be arranged to surround the rotary shaft 120 in a radial direction away from the rotary shaft 120 provided in the compressor 10.

For example, the plurality of displacement sensors 81 includes a first displacement sensor 81-1, a second displacement sensor 81-2, a third displacement sensor 81-3, and a fourth displacement sensor 81-4 ).

The plurality of displacement sensors 81 are provided with a pair of displacement sensors arranged so as to face each other in the up-and-down direction with respect to the transverse section of the rotary shaft 120 and a pair of displacement sensors arranged perpendicularly to the imaginary line I connecting the pair of displacement sensors And another pair of displacement sensors arranged to face each other in the direction (i.e., in the left-right direction).

A pair of displacement sensors arranged to face each other in the up-and-down direction are formed to sense a vertical displacement of the rotation shaft 120, and another pair of displacement sensors arranged to face each other in the left- To detect a leftward and rightward displacement of the vehicle.

For example, referring to FIG. 6, the plurality of displacement sensors 81 may include first and third displacement sensors 81-1 and 81 (first and second displacement sensors) arranged to face each other in the vertical direction, And third and fourth displacement sensors 81-1 and 81-3 arranged to face each other in a direction perpendicular to the imaginary line I connecting the first and third displacement sensors 81-1 and 81-3 with each other And fourth displacement sensors 81-2 and 81-4.

6, the plurality of displacement sensors 81 may include a pair of first and third displacement sensors 81 (see FIG. 6) that are opposed to each other in the Y-axis direction with the rotation axis 120 interposed therebetween, -1 and 81-3 and a pair of second and fourth displacement sensors 81-2 and 81-4 facing each other in the X axis direction with the rotation axis 120 therebetween.

The first and third displacement sensors 81-1 and 81-3 are configured to sense the vertical displacement of the rotary shaft 120 and the second and fourth displacement sensors 81-2 and 81-4 May be configured to sense a lateral displacement of the rotation shaft 120. [

For example, as shown in FIG. 7, a plurality of displacement sensors 81 may be electrically connected to the control unit C. That is, the first displacement sensor 81-1, the second displacement sensor 81-2, the third displacement sensor 81-3 and the fourth displacement sensor 81-4 are electrically connected to the control unit C Can be connected.

Therefore, the sensed values sensed by the first displacement sensor 81-1, the second displacement sensor 81-2, the third displacement sensor 81-3 and the fourth displacement sensor 81-4 are transmitted to the controller C ).

At this time, the controller C is configured to determine the vertical position of the rotation shaft 120 based on the first value, which is the difference of the sensed values sensed by the pair of displacement sensors 81-1 and 81-3 . That is, the first values may represent differences in sensed values detected by the first displacement sensor 81-1 and the third displacement sensor 81-3, which are opposite to each other.

The controller C may be configured to determine the left and right positions of the rotation shaft 120 through a second value that is a difference in sensed values sensed by the other pair of displacement sensors 81-2 and 81-4 . That is, the second value may indicate a difference in sensed values detected by the second displacement sensor 81-2 and the fourth displacement sensor 81-4, which are opposite to each other.

The reason why the sensing value sensed by each of the displacement sensors opposed to each other, rather than the sensing value sensed by each displacement sensor, is used for position control of the rotation axis 120 is that the diameter of the rotation axis 120 To precisely control the position of the rotating shaft 120 even when the rotating shaft 120 is changed.

That is, if the position of the rotation shaft 120 is controlled based on the difference in sensing value sensed by the displacement sensors facing each other, even if the diameter of the rotation shaft 120 changes due to heat or centrifugal force, The positional control of the position detecting device can be performed.

For example, when the difference in sensed sensed values of the displacement sensors facing each other becomes zero, the rotation axis 120 may be located at a center position in the bearing housing 140.

Meanwhile, a plurality of magnetic bearings 141 may be installed in the bearing housing 140. The plurality of magnetic bearings 141 may be spaced radially from the rotation axis 120 so as to surround the rotation axis 120.

For example, the plurality of magnetic bearings 141 may include a first magnetic bearing 141-1, a second magnetic bearing 141-2, a third magnetic bearing 141-3, and a fourth magnetic bearing 141- 4).

The plurality of magnetic bearings 141 may include a pair of magnetic bearings disposed to face each other in the vertical direction with respect to a transverse section of the rotary shaft 120 and a pair of magnetic bearings arranged in a direction perpendicular to the imaginary line connecting the pair of magnetic bearings I.e., in the left-right direction) of the magnetic bearings.

That is, the plurality of magnetic bearings 141 may be disposed at radial positions corresponding to the pair of displacement sensors and the pair of displacement sensors described above, with respect to the rotating shaft 120.

For example, the plurality of magnetic bearings 141 may be installed in the bearing housing 140 in front of or behind the corresponding displacement sensor 81.

2, a plurality of magnetic bearings 141 disposed in front of the motor 130 are disposed in front of the corresponding front displacement sensor 81, and a plurality of magnetic bearings 141 disposed in the rear of the motor 130 The three magentonic bearings 142 are disposed behind the rear displacement sensor 82.

A plurality of magnetic bearings 141 disposed in front of the motor 130 and a front displacement of the front displacement sensor 81 and a plurality of the magentic bearings 142 disposed behind the motor 130, The relationship of the front and rear portions 82 is not limited to this.

The other pair of displacement sensors disposed so as to face each other in the left and right direction are disposed on the rotation axis 120 In the left-right direction.

6, the plurality of magnetic bearings 141 may include first and third magnetic bearings 141-1 and 141 (first and second bearings) 141 and 142 disposed to face each other in a vertical direction with respect to a transverse section of the rotary shaft 120. [ 3 and the second and fourth magnetic bearings 141-2 and 142-3 disposed so as to face each other in the direction perpendicular to the virtual line connecting the first and third magnetic bearings 141-1 and 141-3 -4). ≪ / RTI >

6, the plurality of magnetic bearings 141 may include a pair of first and third magnetic bearings 141 and 142 facing each other in the Y axis direction with the rotation axis 120 interposed therebetween, -1 and 141-3 and a pair of second and fourth magnetic bearings 141-2 and 142-4 facing each other in the X axis direction with the rotation axis 120 interposed therebetween.

The pair of first and third magnetic bearings 141-1 and 141-3 are formed to control the vertical displacement of the rotary shaft 120 and the pair of second and fourth magnetic bearings 141-2, and 142-4 may be configured to control the lateral displacement of the rotation shaft 120. [

For example, as shown in FIG. 7, a plurality of magnetic bearings 141 may be electrically connected to the control portion C. That is, the first magnetic bearing 141-1, the second magnetic bearing 141-2, the third magnetic bearing 141-3, and the fourth magnetic bearing 141-4 are electrically connected to the control unit C Can be connected.

The controller C controls the rotation shaft 120 disposed inside the bearing housing 140 to be positioned at a predetermined position in the bearing housing 140 based on the first value and the second value. The magnetic bearing 141 can be controlled.

In other words, the controller C receives the signals from the plurality of displacement sensors 81, calculates the first and second values, and transmits the calculated first and second values to the bearing housing 140 through the magnetic bearing 141 The position of the rotation shaft 120 can be controlled.

The foregoing description of the preferred embodiments of the present invention has been presented for purposes of illustration and various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention, And additions should be considered as falling within the scope of the following claims.

10 compressor 20 condenser
30 Expansion Valve 40 Evaporator
50 Air-conditioning unit 60 Cooling unit
81 Displacement sensor 82 Displacement sensor
110 Impeller 120 Rotary shaft
130 Motor 140 Bearing housing
141 Magnetic Bearing 142 Magnetic Bearing

Claims (20)

At least one impeller for sucking the refrigerant in the axial direction and compressing the refrigerant in the centrifugal direction;
A rotating shaft configured to rotate the impeller;
And a displacement sensor configured to sense a displacement of the rotary shaft,
Wherein the displacement sensor includes a flexible circuit board and a coil disposed on both sides of the flexible circuit board,
Wherein the flexible circuit board comprises a plurality of substrate units connected through at least one heat connection. The method according to claim 1,
Wherein the plurality of substrate units are stacked in a zigzag direction through bending of the at least one connection portion. 3. The method of claim 2,
The coils being spirally arranged on both sides of each substrate unit,
Each of the substrate units is provided with a via hole at a position corresponding to the radially inner end of the coil,
Wherein a radially inner end of the coil disposed on one side of each of the substrate units is connected to a radially inner end of the coil disposed on the other side of the respective substrate unit through the via hole. The method of claim 3,
In a state in which the plurality of substrate units are stacked,
The two substrate units located at the outermost periphery are connected to the neighboring substrate units by one connecting portion,
Wherein one or more substrate units located between the two outermost substrate units are each connected to neighboring substrate units by two connection portions. The method of claim 3,
In a state in which the plurality of substrate units are stacked,
One of the coils disposed on the upper surface and the lower surface of each of the substrate units has a radially outer end which is disposed on the upper surface and the lower surface of the adjacent substrate unit through the coil disposed on the connecting portion, Is connected to the compressor. 6. The method of claim 5,
And the coils disposed on the connecting portion are formed in a net shape. The method according to claim 1,
Wherein the at least one connection portion and the plurality of substrate units are integrally formed. The method according to claim 1,
Wherein at least a portion of the coil is coated with an insulator. The method according to claim 1,
Wherein the displacement sensor further comprises a ferrite core coupled with the plurality of substrate units,
Wherein a plurality of fastening holes are formed in a central portion of the plurality of substrate units, and fastening protrusions corresponding to the fastening holes are formed in the ferrite core. The method according to claim 1,
Wherein the displacement sensor is configured to sense a radial displacement of the rotation axis. 11. The method of claim 10,
Wherein a plurality of displacement sensors are provided around the rotating shaft in a radial direction from the rotating shaft. 12. The method of claim 11,
Wherein the plurality of displacement sensors comprise:
A pair of displacement sensors arranged so as to face each other in the vertical direction with respect to the transverse section of the rotary shaft and another pair of displacement sensors arranged so as to face each other in the direction perpendicular to the imaginary line connecting the pair of displacement sensors Wherein the compressor comprises a compressor. 13. The method of claim 12,
A position of the rotation shaft in the up-and-down direction is determined through a first value, which is a difference in sensing value sensed by the pair of displacement sensors,
Wherein a position of the rotary shaft in the left and right direction is determined based on a second value that is a difference in sensed values sensed by the other pair of displacement sensors. 14. The method of claim 13,
Further comprising a control unit electrically connected to the pair of displacement sensors and the other pair of displacement sensors,
The pair of displacement sensors and the pair of displacement sensors are installed at radial positions corresponding to the positions of the magnetic bearings with respect to the rotation axis,
Wherein the control unit controls the magnetic bearing so that the rotation axis in the bearing housing is located at a predetermined position in the bearing housing, based on the first value and the second value. A compressor including at least one impeller for sucking refrigerant in an axial direction and compressing the refrigerant in a centrifugal direction, a rotary shaft formed to rotate the impeller, and a displacement sensor configured to sense a displacement of the rotary shaft;
A condenser for condensing the refrigerant by exchanging heat between the refrigerant compressed in the compressor and the cooling water;
An expansion valve through which the refrigerant condensed in the condenser expands; And
And an evaporator for evaporating the refrigerant and cooling the cold water by exchanging heat between the refrigerant expanded in the expansion valve and the cold water,
Wherein the displacement sensor includes a flexible circuit board and a coil disposed on both sides of the flexible circuit board,
Wherein the flexible circuit board comprises a plurality of substrate units connected through at least one heat connection. 16. The method of claim 15,
Wherein the plurality of substrate units are stacked in a zigzag direction through bending of the at least one connection portion. 17. The method of claim 16,
In a state in which the plurality of substrate units are stacked,
One of the coils disposed on the upper surface and the lower surface of each of the substrate units has a radially outer end which is disposed on the upper surface and the lower surface of the adjacent substrate unit through the coil disposed on the connecting portion, To the chiller system. 16. The method of claim 15,
A plurality of displacement sensors are disposed around the rotation axis in a radial direction from the rotation axis,
Wherein the plurality of displacement sensors comprise:
A pair of displacement sensors arranged so as to face each other in the vertical direction with respect to the transverse section of the rotary shaft and another pair of displacement sensors arranged so as to face each other in the direction perpendicular to the imaginary line connecting the pair of displacement sensors Wherein the chiller system comprises a chiller system. 19. The method of claim 18,
A position of the rotation shaft in the up-and-down direction is determined through a first value, which is a difference in sensing value sensed by the pair of displacement sensors,
Wherein a position of the rotary shaft in the left-right direction is determined based on a second value, which is a difference in sensing value sensed by the other pair of displacement sensors. 16. The method of claim 15,
And an air conditioning unit for cooling the air in the air conditioning space by exchanging heat between the cold water cooled in the evaporator and the air in the air conditioning space.

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