KR102513211B1 - Malfunction preventing compressor and refrigerator including the same - Google Patents

Abstract

A refrigeration device including a malfunction-prevention compressor comprises: a motor housing; a first bearing housing which is coupled to one side of the motor housing; a first compression part which is installed in the first bearing housing; a first impeller which is installed on a shaft mounted in the motor housing to be located inside the first compression part; a second bearing housing which is coupled to the other side of the motor housing; a second compression part which is installed in the second bearing housing; a second impeller which is installed on the shaft to be located inside the second compression part; a disc-shaped thrust collar which is installed on the shaft; a first air foil bearing which is located between one side of the thrust collar and the second bearing housing; a second air foil bearing which is positioned between the other side of the thrust collar and the seal member of the motor housing; an acceleration sensor which is installed on the outer circumference of the second bearing housing, outside the thrust collar in the radial direction, and detects abnormal vibration values of the second bearing housing when at least one of the first and second air foil bearings is abnormal; and a malfunction detection part which determines malfunction of the acceleration sensor and outputs a replacement signal for the acceleration sensor. Therefore, the refrigeration device can effectively detect excessive vibration of the bearing housing occurring in the event of an abnormality in the air foil bearings.

Description

Malfunction preventing compressor and refrigerator including the same}

The present invention relates to a malfunction-preventive compressor and a refrigerator having the same, and more particularly, an air foil bearing is installed, and an acceleration sensor is installed on the outer circumference of the bearing housing to prevent malfunction of the bearing housing that occurs when the air foil bearing is abnormal. Excessive vibration can be efficiently detected, and the acceleration sensor is installed on the outer circumference of the bearing housing, making it easy to install and service the acceleration sensor. A malfunction-preventing compressor that can detect more accurately and outputs a signal for repair or replacement of the acceleration sensor by testing whether or not the acceleration sensor is broken when the set time elapses due to the refrigerator being operated for a long time, and a refrigerator equipped with the same It is about.

In general, refrigerators can be divided into absorption refrigerators and vapor compression refrigerators, and vapor compression refrigerators can compress refrigerant using a compressor, a condenser that condenses the refrigerant compressed in the compressor, and a refrigerant condensed in the condenser. It includes an expansion mechanism for expanding and an evaporator for evaporating the refrigerant expanded in the expansion mechanism.

A compressor of the vapor compression type refrigerator may be used among centrifugal compressors. In this case, the refrigerant evaporated in the evaporator may flow into the compressor and be compressed, and the refrigerant compressed in the compressor may flow into the condenser and be evaporated.

The compressor may be composed of a motor unit that generates power and a compression unit that absorbs and compresses the refrigerant by the driving force transmitted from the motor unit, and discharges the refrigerant in a high-pressure state while converting kinetic energy generated in the motor unit into a constant pressure. can

The compressor includes a radial bearing supporting the shaft of the motor unit in a radial direction and a thrust bearing supporting the shaft in an axial direction, and vibration or noise may be generated due to play generated in the bearing.

A compressor has been developed to solve the above problems, and a compressor according to the prior art includes a motor housing, a stator disposed inside the motor housing, a rotor disposed to rotate inside the stator, a shaft on which the rotor is installed, and a motor housing. A first bearing housing coupled to one side, a first sealing member installed on the first bearing housing, a first compression unit installed on the first bearing housing, and a first impeller installed on the shaft to be located inside the first compression unit , The second bearing housing coupled to the other side of the motor housing, the second seal member installed in the second bearing housing, the second compression unit installed in the second bearing housing, and the second compression unit installed on the shaft to be located inside the second compression unit 2 impeller, a connecting tube connecting the first compression unit and the second compression unit, a disk-shaped thrust collar installed on the shaft, a first air foil bearing located between one surface of the thrust collar and the second bearing housing, and a thrust collar A second airfoil bearing located between the other surface and the second seal member, and installed on the radially outer side of the thrust collar among the outer circumferences of the second bearing housing, and at least one of the first airfoil bearing and the second airfoil bearing. An acceleration sensor for detecting an abnormal vibration value of the second bearing housing when any one is abnormal.

The background art of the present invention is disclosed in Republic of Korea Patent Registration No. 10-2268282 (Announced on June 17, 2021, title of invention: compressor and refrigerator having the same).

In the compressor according to the prior art, an encoder disk installed inside the compressor detects the speed of the rotating assembly, and a controller communicating with the encoder disk controls the number of revolutions of the rotating 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 or not the thrust bearing is abnormal through the speed detection of the rotating assembly.

In addition, since the compressor according to the prior art does not have a separate technical configuration capable of determining whether the acceleration sensor is out of order, even if abnormal vibration occurs in the compressor, it cannot be detected, and the compressor continues to operate, resulting in malfunction or damage. There are problems that could be.

Therefore, there is a need to improve this.

In the present invention, an air foil bearing is installed and an acceleration sensor is installed on the outer circumference of the bearing housing to efficiently detect excessive vibration of the bearing housing that occurs when the air foil bearing is abnormal, and the acceleration sensor is installed on the outer circumference of the bearing housing It is installed in the accelerometer, so it is easy to install and service the accelerometer. The accelerometer is not affected by the high temperature inside the motor housing, and it can more accurately detect the vibration value of the bearing housing. An object of the present invention is to provide a malfunction-preventing compressor that tests whether a sensor is out of order and outputs a signal for repair or replacement of an acceleration sensor so that an operator can recognize it, and a refrigerator equipped with the same.

The present invention, the motor housing; 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 a shaft installed in the motor housing to be located inside the first compression unit; a second bearing housing coupled to the other side of the motor housing; a second compression unit installed in the second bearing housing; a second impeller installed on the shaft to be located inside the second compression unit; a disk-shaped thrust collar installed on the shaft; a first air foil bearing positioned between one surface of the thrust collar and the second bearing housing; a second air foil bearing positioned between the other surface of the thrust collar and the sealing member of the motor housing; It is installed radially outside of the thrust collar among the outer circumferences of the second bearing housing, and when at least one of the first airfoil bearing and the second airfoil bearing is abnormal, the abnormal vibration value of the second bearing housing an acceleration sensor that detects; and a malfunction detection unit that determines whether the acceleration sensor is out of order and outputs a replacement signal for the acceleration sensor.

In addition, the acceleration sensor of the present invention includes a piezoelectric element, an inertial mass, a unit base, a fixing bolt, a base, an insulating layer, an impedance converter, an internal signal line, an external signal line, a connector, an acceleration sensor housing, and a fixing nut. It is characterized in that the length of the fixing bolt is minimized by configuring the chin to go down to the inner diameter portion of the element.

In addition, the present invention, the motor housing; 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 a shaft installed in the motor housing to be located inside the first compression unit; a second bearing housing coupled to the other side of the motor housing; a second compression unit installed in the second bearing housing; a second impeller installed on the shaft to be located inside the second compression unit; a disk-shaped thrust collar installed on the shaft; a first air foil bearing positioned between one surface of the thrust collar and the second bearing housing; a second air foil bearing positioned between the other surface of the thrust collar and the sealing member of the motor housing; It is installed radially outside of the thrust collar among the outer circumferences of the second bearing housing, and when at least one of the first airfoil bearing and the second airfoil bearing is abnormal, the abnormal vibration value of the second bearing housing an acceleration sensor that detects; and a malfunction detection unit that determines whether the acceleration sensor is out of order and outputs a replacement signal for the acceleration sensor.

The malfunction-preventing compressor and the refrigerator having the same according to the present invention have an advantage of efficiently detecting excessive vibration of the bearing housing generated when an airfoil bearing is abnormal because an acceleration sensor is installed on the circumferential surface of the bearing housing.

In addition, since the malfunction-preventing compressor and the refrigerator having the same according to the present invention have an acceleration sensor installed on the circumferential surface of the bearing housing, the installation or disassembly of the acceleration sensor is easy, and the time required for installation and replacement of the acceleration sensor is reduced. and cost savings.

In addition, since the malfunction-preventing compressor and the refrigerator having the same according to the present invention have an acceleration sensor installed on the circumferential surface of the bearing housing, deformation or damage of the acceleration sensor due to high temperature inside the motor housing is prevented and at the same time, the bearing housing There is an advantage in that the vibration value can be measured more accurately.

In addition, the malfunction-preventing compressor and the acceleration sensor of the refrigerator having the same according to the present invention change the shape of the inertial mass, which is a component, and apply free torque to the piezoelectric element, the inertial mass, and the unit base to reduce the screw length of the fixing bolt, thereby reducing the temperature. It has stable characteristics at high temperatures by reducing thermal expansion according to the temperature, and also has the advantage of obtaining more stable output characteristics at high temperatures by proceeding at a temperature of 45 ° C to 55 ° C to apply pre-torque instead of room temperature.

In addition, the malfunction-preventing compressor and the refrigerator having the same according to the present invention block or connect the detection signal transmitted from the acceleration sensor when the operation of the refrigerator continues for a long period of time and the set period elapses, thereby determining whether the acceleration sensor is malfunctioning. Since the sensor is provided, it is possible to prevent the malfunction or damage of the compressor while the refrigerator continues to operate without detecting abnormal vibration of the compressor due to the malfunction of the acceleration sensor by checking the failure of the acceleration sensor for each set period.

In addition, the malfunction-preventing compressor and the refrigerator having the same according to the present invention open and close the connector connecting or disconnecting the internal signal line and the external signal line of the acceleration sensor by the operation of the malfunction detection unit by the operation of the opening and closing unit, and the detection received by the control unit It is possible to detect the failure of the acceleration sensor by determining the signal, and since the connector is provided with a connection fixing unit that maintains the connection state when the connector is connected, there is an advantage in preventing malfunction of the connector being disconnected without driving the opening and closing unit.

In addition, since the malfunction-preventing compressor and the refrigerator having the same according to the present invention are provided with an interlocking unit that converts the opening and closing operation of the opening and closing unit into a restraining operation or release operation of the connection and fixing unit, the opening and closing operation is performed according to the driving signal transmitted from the control unit. When driven, the interlocking part is driven at the same time to drive the connection fixing part, thereby maintaining the connection state of the connector and preventing interference between the connector and the connection fixing part when the connector is separated.

1 is a configuration diagram showing a refrigerator including a malfunction-preventing compressor according to a first embodiment of the present invention.
2 is a configuration diagram showing a malfunction prevention type compressor according to a first embodiment of the present invention.
FIG. 3 is an enlarged view of portion A shown in FIG. 2 .
4 is a configuration diagram showing a malfunction prevention type compressor according to a first embodiment of the present invention.
5 is a cross-sectional view showing an acceleration sensor of a malfunction-preventing compressor according to a first embodiment of the present invention.
6 is a configuration diagram showing a malfunction detection unit of a malfunction prevention type compressor according to a first embodiment of the present invention.
7 is an operating state diagram showing a malfunction detection unit of the malfunction prevention type compressor according to the first embodiment of the present invention.
8 is a cross-sectional view illustrating a connection fixing part, an interlocking part, and an anti-slip part of a malfunction-preventing compressor according to a second embodiment of the present invention.

Hereinafter, an embodiment of a malfunction-preventing compressor and a refrigerator including the same will be described with reference to the accompanying drawings.

In this process, the thickness of lines or the size of components shown in the drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of a user or operator.

Therefore, definitions of these terms will have to be made based on the content throughout this specification.

1 is a configuration diagram showing a refrigerator including a malfunction-preventing compressor according to a first embodiment of the present invention, and FIG. 2 is a configuration diagram showing a malfunction-prevention type compressor according to a first embodiment of the present invention, FIG. 3 is an enlarged view of portion A shown in FIG. 2 .

4 is a configuration diagram showing a malfunction-preventing compressor according to the first embodiment of the present invention, and FIG. 5 is a cross-sectional view showing an acceleration sensor of the malfunction-prevention type compressor according to the first embodiment of the present invention, 6 is a configuration diagram showing the malfunction detection unit of the malfunction prevention type compressor according to the first embodiment of the present invention, and FIG. 7 is an operating state diagram showing the malfunction detection unit of the malfunction prevention type compressor according to the first embodiment of the present invention. am.

1 to 7, a refrigerator having a malfunction-preventing compressor according to an embodiment of the present invention includes a compressor 1 for compressing a refrigerant, and a compressor 1 connected to the compressor 1 through a refrigerant line. A condenser 2 in which the refrigerant compressed in ) is condensed, an expansion mechanism 3 in which the refrigerant condensed in the condenser 2 expands by being connected to the condenser 2 and the refrigerant line, and the expansion mechanism 3 and the refrigerant line It includes an evaporator 4 connected to and evaporating the refrigerant expanded by the expansion mechanism 3, and a control unit 5 that controls the compressor 1.

The condenser 2 of the present embodiment includes a cooling water inlet line 2A through which cooling water cooled by a cooling tower or the like flows into the condenser 2, and a cooling water outlet line through which the cooling water heat-exchanged with the refrigerant in the condenser 2 moves to the cooling tower or the like ( 2B) can be connected.

In addition, the expansion mechanism 3 of this embodiment can be composed of a capillary tube or an electronic expansion valve whose opening degree can be varied, and when the expansion mechanism 3 is constituted by an electronic expansion valve, the expansion mechanism 3 The opening may also be adjusted by the control unit 5.

The evaporator 4 includes 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. A cold water outlet line 4B, which is moved to a cold water consumer such as a unit, is connected.

The control unit 5 of this embodiment can be mounted on the compressor 1, and the control unit 5 is connected to an acceleration sensor 78 installed on the compressor 1 and a signal line 79 to be described later.

In addition, the control unit 5 of this embodiment can detect whether or not the compressor 1 is abnormal according to the detected value detected by the acceleration sensor 78, and if it is determined that the compressor 1 is abnormal, the compressor It is possible to stop (1), and the control unit 5 can stop the compressor 1 if the detected value of the acceleration sensor 78 is in an abnormal range higher than the normal range.

The control unit 5 can detect whether or not the compressor 1 is abnormal according to the detection value detected by the acceleration sensor 78, and if it is determined that the compressor 1 is abnormal, a mechanism for notifying the abnormality of the compressor 1 (6).

Here, the notification mechanism 6 may be configured as a display displaying information about the refrigerator or a buzzer capable of notifying information about the refrigerator to the outside.

In addition, if the detection value of the acceleration sensor 78 is in an abnormal range higher than the normal range, the control unit 5 may inform the abnormality of the compressor 1 through the notification mechanism 6.

In the compressor 1 of this embodiment, the motor unit M may operate the compression unit C, and in the compressor 1, one motor unit M operates two compression units C1 and C2. In this case, the compressor 1 includes a first compression unit C1 installed on one side of the motor unit M and a second compression unit C2 installed on the other side of the motor unit M.

When the compressor includes two compression units (C1) (C2), the two compression units (C1) (C2) are symmetrically disposed with the motor unit (M) interposed therebetween, and the refrigerant of the refrigerator having the turbo compressor is After being evaporated in the evaporator 4, it is compressed in the two compression units C1 and C2, and then may flow to the condenser 2.

The two compression units (C1) and (C2) may be configured so that the gas refrigerant compressed in the first compression unit (C1) is compressed in the second compression unit (C2), the first compression unit (C1) and the second compression unit (C1). Part C2 is connected to a refrigerant tube such as a refrigerant pipe.

The refrigerant primarily compressed in the first compression unit C1 of the two compression units C1 and C2 flows into the second compression unit C2 and performs secondary compression. The refrigerant compressed in multiple stages by the two compression units C1 and C2 may flow to the condenser 2, and the two compression units C1 and C2 may be connected in parallel.

As described above, the compressor 1 of this embodiment includes a motor housing 10, a stator 20 disposed inside the motor housing 10, a rotor 30 disposed to rotate 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.

In addition, the compressor 1 of this embodiment includes a bearing housing 50 coupled to the motor housing 2, a thrust collar 70 installed on the shaft 30, one surface of the thrust collar 70, and a bearing housing 50 ), the first air foil bearing 72 located between the bearing housing 50, the sealing member 74, and the second air foil located between the other surface of the thrust collar 70 and the sealing member 74 The bearing 76, the acceleration sensor 78 installed on the outer circumference of the bearing housing 50, and a malfunction detection unit that determines whether or not the acceleration sensor 78 is out of order and outputs a replacement signal for the acceleration sensor 78 further includes do.

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 circumference of the bearing housing 50 may constitute the motor unit M.

In addition, the motor housing 10 of the present embodiment is made of a motor outer case forming the exterior of the motor unit M, and the motor housing 10 may have a flange 14 formed on the hollow cylinder 13.

A space in which the stator 20 and the rotor 30 can be accommodated may be formed inside the hollow cylinder 13, and a branching portion 15 in which a through hole through which electric wires or the like can pass is formed in the hollow cylinder 13 is formed protrudingly.

A cover 16 covering the branching part 15 is coupled to the motor housing 12, an installation hole 18 in which the power terminal block 17 is installed is formed in the cover 16, and the flange 14 is a hollow cylinder. It is formed larger than (13), and the flange 14 is formed in the shape of a hollow disc body, and is made of a bearing housing mounting plate to which the bearing housing 50 is in close contact and coupled.

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

The flange 14 is formed on one end and the other end of the hollow cylinder 13, respectively, and the motor housing 12 is formed on the first flange 14A formed on one end of the hollow cylinder 13 and the other end of the hollow cylinder 13. and a formed second flange 14B.

The first bearing housing 50A is coupled to the first flange 14A, and the second bearing housing 50B is coupled to the second flange 14B.

The stator 20 is installed to be located on the inner circumference of the motor housing 10, the stator 20 is formed in a hollow cylindrical shape, and the stator 20 receives power from the outside to form a magnetic field.

In the stator 20, a coil is wound on an iron core, and the stator 20 is connected to the power terminal block 17 by wires to receive power from the power terminal block 17, and the rotor 30 is connected to the outside of the shaft 40. It can be installed around the circumference, is installed at a position facing the stator 20 among the outer circumference of the shaft 40, and the rotor 30 is rotated at high speed by the stator 20 and the induced magnetic field.

In the compressor, the motor unit M may be a BLDC motor, the rotor 30 may be rotated by an induced magnetic field induced in the stator 20, and the rotor 30 may have a shorter length than the shaft 40 It includes a magnet and a magnet holder fixing the magnet to the shaft 30.

Here, the shaft 40 can be rotated together with the rotor 30 when the rotor 30 rotates, the shaft 40 is formed longer than the rotor 30, and the shaft 40 is the motor housing 10 formed longer.

One end 41 and the other end 42 of the shaft 40 are located outside the motor housing 10, and the compressor 1 is shown in FIG. 1 when the compressor 1 includes two compression parts C1 and C2. As described above, one end 41 of the shaft 40 extends into the first compression part C1 of the two compression parts C1 and C2, and the other end 42 of the shaft 40 has two compression parts C1 and C2. It extends into the second compression part C2 among the compression parts C1 and C2.

The compressor 1 includes at least one bearing supporting a shaft 30, and the bearing housing 50 supports and protects this bearing.

When the compressor 1 includes two compression parts C1 and C2, two bearing housings 50 are installed in the motor housing 10, and the bearing housing 50 is connected to the first flange 14A. It includes a coupled first bearing housing 50A and a second bearing housing 50B coupled to the second flange 14B.

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 when described separately, the first bearing housing 50A and the second bearing housing 50B ) and described.

The bearing housing 50 includes a plate 52 coupled to the motor housing 50 and a cylindrical portion 54 disposed protruding from the plate 52 and surrounding a portion of the shaft 40 .

Here, the cylindrical portion 54 is formed integrally with the plate 52, and the cylindrical portion 54 is composed of a hollow cylindrical bearing bush formed separately from the plate 52, and can be fastened with the plate 52, , The cylindrical portion 54 may be formed to protrude from the plate 52 in a direction toward the rotor 30 .

A third airfoil bearing 60 supporting the shaft 40 is installed in the cylindrical portion 54, and the third airfoil bearing 60 is installed between the shaft 40 and the cylindrical portion 54, the shaft 40 rotatably supported.

In the compressor, a plurality of third air foil bearings 60 support the shaft 30, and the third air foil bearing 60 includes the cylindrical portion 54 of the first bearing housing 50A and the second bearing housing ( 50B) are respectively installed in the cylindrical portion 54.

The third air foil bearing 60 includes a plurality of thin plate-shaped foils, and the shaft 40 is supported by a working gas or air layer between the plurality of foils and the shaft 30 during rotation, and each of the plurality of foils It includes a fitting part fitted into and fixed to the fitting groove formed on the inner circumference of the cylindrical part 54, and a support part extending from the fitting part and having a curved surface.

In addition, the impeller 90 of this embodiment is installed at the end of the shaft 30 and rotates together with the shaft 40 when the shaft 30 rotates, and a plurality of impellers 90 are installed in the compressor.

The compressor 1 of the present embodiment is composed of a two-stage compressor in which a plurality of impellers 90 compress the refrigerant in multiple stages, and the compressor 1 has impellers at one end 41 and the other end 42 of the shaft 40, respectively. 90) is installed.

The compressor 1 includes 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, and the first impeller 90A is a first compression unit. (C1) is installed on the shaft 40 to be located inside, the second impeller (90B) is installed on the shaft 40 to be located inside the second compression unit (C2).

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

When the compressor 1 includes two compression parts C1 and C2, each compression part C1 and C2 includes an inlet guide 100, a diffuser 110, and a volute housing 120. do.

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

The second compression unit (C2) converts the kinetic energy of the refrigerant gas flowing by the second inlet guide (100B) and the second impeller (90B) for guiding the gas refrigerant to the second impeller (90B) into pressure energy. It includes a second diffuser 110B and a second volute housing 120B having a second volute channel 118B in which air flowed by the second impeller 90B is collected.

The bearing housing 50 has an accommodating groove 58 in which the trust collar 70 is rotatably received is formed on one surface, the accommodating groove 58 is formed on one surface of the plater 52, and the accommodating groove 58 Of the platter 52, the surface 52B opposite to the surface 52A facing the inside of the motor housing 10 is formed in a recessed shape, and the receiving groove 58 is formed larger than the thrust collar 70.

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

The thrust collar 70 is installed on the shaft 40 to secure a thrust support area, is formed larger than the shaft 40, the thrust collar 70 is formed in a disk shape, and the thrust collar 70 is formed on the shaft ( 40) is installed to protrude in a direction orthogonal to the longitudinal direction of the shaft 40 on the outer circumference.

The thrust collar 70 has one surface 70A facing the first airfoil bearing 72 and the other surface 70B facing the second airfoil bearing 74.

The first airfoil bearing 72 axially supports the thrust collar 70 at a position spaced apart from the second airfoil bearing 76, and the first airfoil bearing 72 is a thin plate installed on the plate 52. It includes a plurality of foils of the shape.

The thrust collar 70 is supported by a working gas or air layer between the plurality of foils of the first airfoil bearing 72 and one surface 70A of the thrust collar 70 during rotation, and the first airfoil bearing 72 It is inserted into the receiving groove 58 of the plate 52 and fastened to the plate 52.

The sealing member 74 of this embodiment may be installed on the plate 52 of the bearing housing 50 . The seal member 74 is composed of a labyrinth seal installed on the opposite surface 52B of the surface 52A facing the inside of the motor housing 10 among both sides of the plate 52, and the compressor 1 In the case of including a plurality of compression units (C1) and (C2), the sealing member 74 is provided for each compression unit (C), and one of the plurality of units is the motor unit (M) and the first compression unit (C1). sealing between them, and the other one of the plurality seals between the motor unit (M) and the second compression unit (C2).

The compressor 1 includes a first sealing member 74A installed on the first bearing housing 50A and a second sealing member 74B installed on the second bearing housing 50B.

The second air foil bearing 76 is spaced apart from the first air foil bearing 72 in the axial direction, and the second air foil bearing 76 has the thrust collar 130 interposed therebetween, and the first air foil bearing 72 and are spaced apart from each other.

The second airfoil bearing 76 includes a plurality of thin plate-shaped foils installed on the sealing member 74, and when the compressor 1 includes two compression parts C1 and C2, the second airfoil The bearing 86 is positioned between the other surface of the thrust collar 130 and the second sealing member 74B, and the second airfoil bearing 86 is installed on the second sealing member 74B.

An accommodation groove 75 in which a plurality of foils are accommodated and mounted is formed in the sealing member 74B where the second air foil bearing 76 is installed, and the thrust collar 70 rotates the second air foil bearing 76 It is supported by a layer of working gas or air between the plurality of foils and the other surface 70B of the trust collar 70.

In addition, the rotor 30, the shaft 40, and the thrust collar 70 of this embodiment may be configured as a rotating assembly that rotates when the compressor 1 is driven.

When at least one bearing of the first airfoil bearing 72 and the second airfoil bearing 74 is abnormal, the rotating assembly rubs against and contacts the thin plate of the airfoil bearing while rotating at high speed, and at this time, vibrates in the circumferential direction. This vibration is transmitted to the bearing housing 50 and measured by the acceleration sensor 78.

When the compressor 1 includes two compression parts C1 and C2, vibration in the circumferential direction is transmitted to the second bearing housing 50B, and this vibration is transmitted to an acceleration sensor installed in the second bearing housing 50B. (78).

The acceleration sensor 78 is installed radially outside the trust collar 70 among the outer circumferences 53 of the bearing housing 50, and the compressor 1 includes two compression parts C1 and C2. , The acceleration sensor 78 is not installed in the first bearing housing 50A, but is installed in the second bearing housing 50B.

The acceleration sensor 78 is mounted on the bearing housing 50 and measures the acceleration of the bearing housing 50 or the intensity of impact when the bearing housing 50 vibrates, and various types such as inertial type, gyro type, and silicon semiconductor type are used. kind can be used.

In addition, since the acceleration sensor 78 is exposed to the outside of the compressor 1, it is possible to easily install or replace the acceleration sensor 78.

The acceleration sensor 78 is installed at a position where an extension line P1 extending in the radial direction from the trust collar 70 intersects among the outer circumferences 53 of the bearing housing 50, and the compressor 1 has two compression units. When (C1) and (C2) are included, the acceleration sensor 78 is located at a position where an extension line P1 extending radially from the trust collar 70 among the outer circumferences 53 of the second bearing housing 50 intersects. installed on

In addition, the acceleration sensor 78 of this embodiment is installed at a position where an extension line P2 extending in the radial direction of the bearing housing 50 from the receiving groove 58 among the outer circumferences 53 of the bearing housing 50 intersects. And, when the compressor 1 includes two compression parts C1 and C2, the acceleration sensor 78 is installed in the bearing housing in the receiving groove 58 of the outer circumference 53 of the second bearing housing 50. It is installed at a position where an extension line P2 extending in the radial direction of (50) intersects.

It is possible that 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 coincide, and are parallel at a small interval. It is also possible.

Both 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 plate 52 of the bearing housing 50. located in

The acceleration sensor 78 is installed on the outer circumference of the plate 52, and when the compressor 1 includes two compression parts C1 and C2, the acceleration sensor 78 is attached to the second bearing housing 50 It is installed on the outer circumference 53 of the plate 52.

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 due to an air foil bearing abnormality. will do

When the compressor 1 installed as described above is driven, the motor unit M is driven to rotate the rotation assembly of the rotor 30, the shaft 40, and the thrust collar 70, and the rotation speed of the rotation assembly is It gradually increases, and during high-speed rotation of the rotating assembly, the thrust collar 70 is spaced apart from the plurality of thin plates of the first air foil bearing 72 by the working fluid or air layer between the first air foil bearing 72 and , spaced apart from the plurality of thin plates of the second air foil bearing 76 by a working fluid or an air layer between the second air foil bearing 76.

When the first airfoil bearing 72 and the second airfoil bearing 74 are normal, the thrust collar 70 is spaced apart 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. At least one of them is rubbed in the circumferential direction, and at this time, vibration of a normal range or higher is transmitted to the bearing housing 50.

When the compressor 1 is started, the acceleration sensor 78 periodically detects the vibration value of the bearing housing 50 and outputs it to the control unit 5 .

The control unit 5 determines whether the vibration value detected by the acceleration sensor 78 is within an ideal range when a set time elapses after the compressor 1 is started or when the rotational speed of the shaft 40 exceeds the set speed.

When the vibration value detected by the acceleration sensor 78 is within an abnormal range, the control unit 5 stops the compressor 1 or informs the compressor 1 of an abnormality through the notification mechanism 6.

In addition, the malfunction detection unit of this embodiment connects the internal signal line 788 provided in the acceleration sensor 78 and the external signal line 789 to the internal signal line 788 to connect the internal signal line 788 to the controller 5. Alternatively, if the connector 710 to be separated and the detected value transmitted from the acceleration sensor 78 after the freezer is driven do not change during the set period, the connector 710 is separated according to the drive signal transmitted from the control unit 5 and detected. After confirming the change in value, when the connector 710 is connected to the opening/closing part 810 for reconnecting the connector 710 and the operation of the opening/closing part 810, pressurizes the connection part of the connector 710 to open the compressor 1. The connector 710 is separated by vibration and the connection fixing part 830 prevents malfunction, and the opening operation of the opening/closing part 810 is converted into a releasing operation of the connection fixing part 830 and transmitted, and the opening and closing part 810 It includes an interlocking unit 836 that converts the closing operation into a restraining operation of the connection fixing unit 830 and transmits it.

Therefore, if the detected value transmitted from the acceleration sensor 78 does not deviate from the set range during the set time elapsed after the refrigerator is operated, the control unit 5 sends a driving signal to the opening/closing unit 810 to disconnect the connector 710. to determine the change in the sensed value transmitted from the acceleration sensor 78.

At this time, if the detected value received by the control unit 5 does not change while the connector 710 is disconnected, it is determined that the acceleration sensor 78 is faulty, and when the connector 710 is disconnected and reconnected, the acceleration If the detected value transmitted from the sensor 78 does not return to its original state, the acceleration sensor 78 is determined to be faulty, and the notification device 6 is driven by the driving signal transmitted from the control unit 5, and the notification device 6 ) through which the failure signal of the acceleration sensor 78 is output.

As described above, the acceleration sensor 78 of this embodiment includes a piezoelectric element 781, an inertial mass 782, a unit base 783, a fixing bolt 784, a base 785, an insulating layer 786, and an impedance converter. 787, internal signal line 788, external signal line 789, connector 7810, acceleration sensor housing 791 and fixing nut 792, in the compression type acceleration sensor, the lower center of the inertial mass 782 The length of the fixing bolt is minimized by making a chin on the part so that the chin goes down to the inner diameter of the piezoelectric element 781.

Here, the fixing bolt 784 uses a ceramic or invar material having a small coefficient of thermal expansion.

In addition, the method for manufacturing a compression-type acceleration sensor according to the present invention includes the steps of forming an insulating layer 786 by applying a mixture of insulating epoxy and insulating ceramic between a base 785 and a unit base 783 and then heating and curing the mixture; , After aligning the piezoelectric element 781 and the inertial mass 782 on the unit base 783, applying a constant torque (78torque) at 45 ° C to 55 ° C with a fixing bolt 784, and the piezoelectric element 781 Adhesion of the impedance converter 787 to which the electrode of is connected to the top of the inertial mass 782 using high-temperature adhesive, connecting the internal signal line 788 to the connector 7810 having the external signal line 789, and A step of sealing the sensor by covering the sensor housing 7811 and waterproofing the sensor housing 7811 is included.

Here, the length of the fixing bolt 784 for applying the pre-torque can be minimized by making a trough of about 1 mm at the lower center of the inertial mass 782 of the present embodiment so that the tuck goes down to the inner diameter portion of the piezoelectric element 781. It has a structure that allows

In addition, the length of the piezoelectric element 781 of this embodiment was set to 2 mm to minimize the change in length according to temperature, and between the base 785 and the unit base 783 of the acceleration sensor, insulating epoxy and insulating ceramic were applied in an appropriate ratio. After mixing and applying to a thickness of about 1 mm, heat curing at 150 ° C for about 30 minutes to form an insulating layer 786 to insulate the acceleration sensor signal from the outside so that there is no noise caused by the ground loop (78 ground loop) .

After aligning the piezoelectric element 781 and the inertial mass 782 on the unit base 783 that has undergone the above process, a constant torque (784 kgf-cm) is applied at 50 ° C using a fixing bolt 784 to remove the base 785. The external vibration transmitted to is transmitted to the piezoelectric element 781.

Next, after connecting the electrode of the piezoelectric element 781 to the impedance converter 787 and attaching it to the fastened inertial mass 782 using a high-temperature adhesive, the internal signal line 788 has an external signal line 789. Connect to the connector 710, cover the accelerometer housing 791 for waterproofing, and then seal the sensor so that an external system can be connected.

Unlike conventional compression type acceleration sensors, the compression type acceleration sensor manufactured by the above method minimizes the length of the fixing bolt 784 for fastening the inertial mass 782, the piezoelectric element 781, and the unit base 783. And, by applying a pre-torque at a high temperature other than room temperature, more stable characteristics can be obtained at a high temperature.

The relationship between the voltage output of the acceleration sensor and the thickness and electrode area of the piezoelectric element 781 is as follows.

[Equation 1]

where Q is the output charge value, d is the thickness of the piezoelectric element, A is the area of the piezoelectric element, and ε is the permittivity of the piezoelectric element.

As given in Equation 1 above, after the piezoelectric element is determined, it can be seen that the output characteristic decreases as the thickness of the piezoelectric element decreases, and increases as the area decreases.

In the present invention, the thickness of the piezoelectric element is reduced for high-temperature stability, but the output is not reduced because the area of the piezoelectric element is much reduced in order to place the lower jaw on the inertial mass to be positioned below the inner diameter of the piezoelectric element.

In addition, when the area and thickness are appropriately adjusted, an acceleration sensor having excellent high temperature stability and excellent output characteristics can be manufactured.

In addition, the opening/closing unit 810 of this embodiment includes an opening/closing cylinder 812 installed in the acceleration sensor so as to be disposed adjacent to the first terminal block 712 to which the internal signal line 788 is connected, and the first terminal block 712 A rod 814 installed to protrude from the opening/closing cylinder 812 to separate the second terminal block 714 to which the external signal line 789 is connected from, and the rod 814 and the second terminal block 714 A connecting protrusion 816 protrudes from the second terminal block 714 to connect, is connected to the rod 814, and has a through hole 817 formed therein, and is installed in the acceleration sensor so as to be slidably inserted into the through hole 817. It includes a guide member 818 to be.

Therefore, when a driving signal is transmitted from the control unit, the rod 814 protrudes from the opening/closing cylinder 812 and moves the second terminal block 714 in a direction away from the first terminal block 712 while moving the first terminal block 712 and the first terminal block 712. While the second terminal block 714 is separated, the connection between the internal signal line 788 and the external signal line 789 is also blocked.

As described above, when the internal signal line 788 and the external signal line 789 are blocked and the detected value transmitted to the controller is changed and the changed detected value is received by the controller, the rod 814 opens and closes the cylinder according to the drive signal transmitted from the controller. 812 is inserted into the inside, and the second terminal block 714 is connected while moving toward the first terminal block 712 again.

As described above, when the internal signal line 788 and the external signal line 789 are connected again and the detected value is received by the controller, the difference between the detected value input before the connector 710 is disconnected and the detected value after the connector 710 is reconnected. When the difference between the detected values of the two is greater than the installation range, it is determined that the acceleration sensor is faulty and an accelerometer fault signal is output through a notification mechanism.

In addition, the connection fixing part 830 according to this embodiment is bent in an 'a' shape, the inner end is rotatably installed in the acceleration sensor by the hinge part 834, and the outer end has an external signal line 789 It includes a cover member 832 in which a fixing groove 837 is formed and an installation groove 838 is formed so that the pinion member 836a is installed at an inner end thereof.

A plurality of guide members 818 extending from the periphery of the corner of the first terminal block 712 toward the outside of the acceleration sensor are installed on the outer wall of the acceleration sensor, and a cover member rotatably spaced between the plurality of guide members 818 ( 832) is installed, and hinge parts 834 are provided on both sides of the inner end of the cover member 832 so that the inner end of the cover member 832 is rotatably installed on the outer wall of the acceleration sensor.

An installation groove 838 is formed at the center of the inner end of the cover member 832 so that the pinion member 836a is installed inside the installation groove 838, and the linear motion of the rod 814 is achieved by the operation of the interlocking unit 836. When transmitted as the rotational motion of the pinion member 836a, the cover member 832 is rotated in a forward or reverse direction by the rotational motion of the pinion member 836a, thereby performing a locking operation or releasing operation of the connector 710.

The interlocking unit 836 of this embodiment includes a pinion member 836a installed on the cover member 832 and a rack member 836b formed on the rod 814 so as to be gear-connected to the pinion member 836a.

Therefore, when the rack member 836b protrudes or is inserted from the opening/closing cylinder 812 and moves linearly, the rack member 836b provided on the rod 814 rotates the pinion member 836a in a forward or reverse direction while pinion member 836a ) rotates the fixed cover member 832 in the forward or reverse direction.

Since the fixing groove 837 is formed at the outer end of the cover member 832, when the outer end of the cover member 832 is rotated toward the second terminal block 714, the external signal line 789 extends from the second terminal block 714. ) is inserted into the fixing groove 837, and the second terminal block 714 is pressed toward the first terminal block 712 by the weight of the cover member 832 to maintain the connection state of the connector 710. .

8 is a cross-sectional view showing a connection fixing part, an interlocking part, and an anti-slip part of a malfunction-preventing compressor according to a second embodiment of the present invention.

Referring to FIG. 8 , in the refrigerator having the malfunction-preventing compressor according to the second embodiment of the present invention, when the cover member 832 is rotated by the operation of the interlocking unit 836, the pinion member 836a and the rack A slip prevention unit 850 for maintaining a gear connection state while bringing the member 836b into close contact with the member 836b is further included.

Therefore, when the rod 814 protrudes from the opening/closing cylinder 812, the rack member 836b rotates the pinion member 836a in a forward or reverse direction. At this time, there is a gap between the rack member 836b and the pinion member 836a. As this occurs, a malfunction in which the linear motion of the rod 814 is not transferred to the rotational motion of the cover member 832 may occur. In this embodiment, the rack member 836b is The pinion member 836a is in close contact with each other to maintain a gear-connected state, thereby preventing malfunction due to slip.

The anti-slip unit 850 of the present embodiment is installed at both ends of the drive shaft 836c of the pinion member 836a and includes a moving block 852 slidably installed along the installation space 854 of the cover member 832 and , A guide rail 856 installed in the installation space 854 to support the moving block 852 in a sliding manner, and a driving shaft 836c and a pinion member 836a by pressing the moving block 852 toward the rack member 836b. ) includes an elastic member 858 interposed between the moving block 852 and the inner wall of the installation space 854 to provide elastic force for pressing the rack member 836b toward the side.

Therefore, the movable block 852 supporting the drive shaft 836c is pressed toward the rack member 836b by the pressing force transmitted from the elastic member 858, and a pair of movable blocks 852 that are pressed toward the rack member 836b. As the drive shaft 836c installed between the drive shaft 836c and the pinion member 836a installed on the drive shaft 836c are pressed toward the rack member 836b, the rack member 836b and the pinion member 836a adhere closely to each other to maintain a gear-connected state. do.

As described above, since the pinion member 836a and the rack member 836b are in close contact with each other to maintain a gear-connected state, the linear motion of the rod 814 is transferred to the rotational motion of the pinion member 836a, and thus the cover member 832 A forward or reverse rotational motion is achieved.

As a result, the air foil bearing is installed, and the acceleration sensor is installed on the outer circumference of the bearing housing to efficiently detect excessive vibration of the bearing housing that occurs when the air foil bearing is abnormal, and the acceleration sensor is installed on the outer circumference of the bearing housing. Installation and service of the acceleration sensor are easy, the acceleration sensor is not affected by the high temperature inside the motor housing, and the vibration value of the bearing housing can be more accurately detected. It is possible to provide a malfunction-preventive compressor that outputs a repair or replacement signal of an acceleration sensor so that a worker can recognize it by testing whether or not there is a malfunction of the malfunction, and a refrigerator equipped with the same.

Although the present invention has been described with reference to an embodiment shown in the drawings, this is merely exemplary, and those skilled in the art can make various modifications and equivalent other embodiments therefrom. will understand

In addition, although the malfunction-preventing compressor and the refrigerator having the same have been described as an example, this is merely an example, and the compressor of the present invention and the refrigerator having the same can be used for other products other than the malfunction-proof compressor and the refrigerator including the same. there is.

Therefore, the true technical protection scope of the present invention should be determined by the claims below.

1: compressor 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 airfoil bearing 78: acceleration sensor
781: piezoelectric element 782: inertial mass
783: unit base 784: fixing bolt
785: base 786: insulating layer
787: impedance converter 788: internal signal line
789: external signal line 710: connector
712: first terminal block 714: second terminal block
791: sensor housing 792: fixing nut
810: opening and closing part 812: opening and closing cylinder
814: rod 816: connecting protrusion
817: through hole 818: guide member
830: connection fixing part 832: cover member
834: hinge part 836: interlocking part
836a: pinion member 836b: rack member
836c: drive shaft 837: fixing groove
838: installation groove 850: slip prevention
852: movement block 854: installation space
856: guide rail 858: elastic member

Claims (3)

delete delete motor housing;
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 a shaft installed in the motor housing to be located inside the first compression unit;
a second bearing housing coupled to the other side of the motor housing;
a second compression unit installed in the second bearing housing;
a second impeller installed on the shaft to be located inside the second compression unit;
a disk-shaped thrust collar installed on the shaft;
a first air foil bearing positioned between one surface of the thrust collar and the second bearing housing;
a second air foil bearing positioned between the other surface of the thrust collar and the sealing member of the motor housing;
It is installed radially outside of the thrust collar among the outer circumferences of the second bearing housing, and when at least one of the first airfoil bearing and the second airfoil bearing is abnormal, the abnormal vibration value of the second bearing housing an acceleration sensor 78 that senses; and
A malfunction detection unit that determines whether the acceleration sensor 78 is out of order and outputs a replacement signal for the acceleration sensor 78,
The malfunction detection unit,
an internal signal line 788 provided in the acceleration sensor 78;
a connector 710 connecting or disconnecting an external signal line 789 to or from the internal signal line 788 to connect the internal signal line 788 to the controller 5;
If the detected value transmitted from the acceleration sensor 78 does not change during the set period after the freezer is driven, the connector 710 is disconnected according to the driving signal transmitted from the control unit 5 to confirm the change in the detected value. an opening/closing unit 810 for reconnecting the connector 710;
When the connector 710 is connected by the operation of the opening/closing part 810, the connecting portion of the connector 710 is pressed to prevent a malfunction in which the connector 710 is separated by vibration of the compressor 1. government 830;
The opening operation of the opening/closing part 810 is converted into a releasing operation of the connection fixing part 830 and transmitted, and the closing operation of the opening/closing part 810 is converted into a restraining operation of the connection fixing part 830 and transmitted. A refrigerator having a malfunction-proof compressor, characterized in that it includes a unit (836).

Images