Rotary machine and rotary machine system

Abstract

This rotary machine is provided with: a housing that houses at least a part of a rotating shaft and a bearing that supports the rotating shaft; a fixing component that is provided inside the housing and constitutes a sliding part; a sensor that measures a physical quantity that changes according to the state of the sliding part; and a propagation member that has one end side connected to the fixing component and the other end side connected to the housing. The sensor is provided outside the housing on the other end side of the propagation member.

Description

Rotating machines and rotating machine systems

[0001] The present disclosure relates to rotary machines and rotary machine systems.

[0002] Patent Document 1 discloses a condition determination system. The condition determination system includes a condition determination device that determines the condition of a rotary machine having a mechanical seal. The mechanical seal is disposed inside a container. The container is filled with a liquid. An AE sensor is fixed to the outer wall of the container. The mechanical seal has a stationary ring fixed to the container side and a rotating ring fixed to the rotating shaft side. The condition determination device acquires an effective value of the AE signal from the AE sensor and bearing characteristic numbers of the mechanical seal or parameters for calculating the bearing characteristic numbers, and determines the condition of the sliding surface of the mechanical seal based on the acquired data.

[0003] Japanese Patent Application Laid-Open No. 2021-103117

[0004] In the above-described condition determination system, the AE signal generated from the sliding surface of the mechanical seal propagates through the liquid inside the container, making it possible to measure the AE signal. However, in general rotating machines, the inside of the housing is rarely filled with liquid. Also, AE signals do not propagate through gas. Therefore, there has been a problem in that it is difficult to detect the condition of the sliding parts of the rotating machine with high accuracy.

[0005] The present disclosure has been made to solve the above-mentioned problems, and has an object to provide a rotating machine and a rotating machine system that can detect the state of a sliding part with high accuracy.

[0006] The rotating machine according to the present disclosure comprises a housing that accommodates at least a portion of a rotating shaft and a bearing that supports the rotating shaft, a fixed part that is provided inside the housing and that constitutes a sliding part, a sensor that measures a physical quantity that changes based on the state of the sliding part, and a transmission member that has one end connected to the fixed part and the other end connected to the housing, and the sensor is provided on the other end of the transmission member outside the housing.

[0007] A rotating machine system according to the present disclosure includes a rotating machine according to the present disclosure, a judgment unit that judges whether or not there is an abnormality in the sliding part based on a physical quantity measured by the sensor, and an alarm issuing unit that issues an alarm signal indicating that there is an abnormality in the sliding part based on a command from the judgment unit.

[0008] According to the present disclosure, the state of a sliding part in a rotary machine can be detected with high accuracy.

[0009] 1 is a longitudinal sectional view showing the configuration of a rotary machine according to a first embodiment. FIG. 1 is a sectional view showing the II-II section of FIG. 1. FIG. 1 is a sectional view showing the III-III section of FIG. 1. FIG. 2 is a schematic view showing the positional relationship between a transmission member and a sensor in the rotary machine according to the first embodiment. FIG. 3 is a view showing the contact surface of the transmission member and the measurement surface of the sensor in the rotary machine according to the first embodiment, viewed in the radial direction. FIG. 4 is a schematic view showing another example of the positional relationship between the transmission member and a sensor in the rotary machine according to the first embodiment. FIG. 5 is a block diagram showing the configuration of a rotary machine system according to the first embodiment. FIG. 6 is a longitudinal sectional view showing the configuration of a rotary machine according to a second embodiment. FIG. 7 is a longitudinal sectional view showing the configuration of a rotary machine according to a third embodiment. FIG. 8 is a longitudinal sectional view showing the configuration of a rotary machine according to a fourth embodiment. FIG. 9 is a side view showing the configuration of a rotary machine according to a fifth embodiment. FIG. 10 is a side view showing another example of the configuration of the rotary machine according to the fifth embodiment. FIG. 11 is a side view showing the configuration of a transmission member in a rotary machine according to a sixth embodiment.

[0010] Embodiments of the present disclosure will be described below with reference to the drawings. The present disclosure is not limited to the following embodiments and can be modified in various ways without departing from the spirit and scope of the present disclosure. Furthermore, the present disclosure includes all possible combinations of the configurations shown in the following embodiments. In particular, the combinations of components are not limited to the combinations in each embodiment; components described in one embodiment can be applied to another embodiment. In the following description, directional terms (e.g., "up," "down," "right," "left," "front," "rear," etc.) are used as appropriate to facilitate understanding, but these are for explanatory purposes and do not limit the present disclosure. In each drawing, components designated with the same reference numerals are identical or equivalent, and this applies throughout the entire specification. Note that the relative dimensional relationships or shapes of each component in each drawing may differ from those in reality.

[0011] Embodiment 1. A rotary machine and a rotary machine system according to Embodiment 1 will be described. FIG. 1 is a longitudinal cross-sectional view showing the configuration of a rotary machine according to this embodiment. In this embodiment, a hermetic rotary refrigerant compressor is exemplified as the rotary machine. FIG. 2 is a cross-sectional view showing a cross section taken along line II-II in FIG. 1. In FIG. 2, suction ports, discharge ports, etc. are omitted from illustration. FIG. 3 is a cross-sectional view showing a cross section taken along line III-III in FIG. 1.

[0012] In the following description, the direction along the axis of the rotating shaft 21 may be referred to as the "axial direction." In a cross section perpendicular to the axial direction, the direction along the circumference of the axis of the rotating shaft 21 may be referred to as the "circumferential direction." In the same cross section, the direction along the radius of the rotating shaft 21 may be referred to as the "radial direction."

[0013] As shown in FIGS. 1 to 3 , the rotary machine 100 includes a compression mechanism 20 that compresses refrigerant gas, an electric motor 30 that drives the compression mechanism 20, and a housing 10 that houses the compression mechanism 20 and the electric motor 30. The housing 10 houses at least a portion of a rotating shaft 21 (described later) and a bearing that rotatably supports the rotating shaft 21. In the case of a hermetic refrigerant compressor, the housing 10 is a cylindrical pressure vessel. However, the housing 10 may simply house at least a portion of the rotating shaft 21 and the bearing for the purposes of protecting the rotating parts or for safety, as in the case of a generator, for example. In this case, the housing 10 does not need to be hermetically sealed. The compression mechanism 20 is located at a lower portion within the housing 10. The electric motor 30 is located above the compression mechanism 20 within the housing 10.

[0014] The compression mechanism 20 and the electric motor 30 are connected by a rotating shaft 21. The rotating shaft 21 transmits the rotational force of the electric motor 30 to the compression mechanism 20. The compression mechanism 20 compresses the refrigerant gas using the transmitted rotational force and discharges it into the housing 10. The interior of the housing 10 is filled with compressed, high-temperature, high-pressure refrigerant gas. Refrigerant oil for lubricating the compression mechanism 20 is stored at the bottom of the housing 10. An oil pump (not shown) is provided below the rotating shaft 21. As the rotating shaft 21 rotates, the oil pump draws up refrigerant oil from the bottom of the housing 10 and supplies it to each sliding part of the compression mechanism 20. This ensures mechanical lubrication of the compression mechanism 20.

[0015] The rotating shaft 21 has a main shaft portion 21a, an eccentric shaft portion 21b, and a counter shaft portion 21c. The main shaft portion 21a, the eccentric shaft portion 21b, and the counter shaft portion 21c are arranged in this order along the axial direction of the rotating shaft 21. A rotor of the electric motor 30 is fixed to the main shaft portion 21a by shrink fitting or press fitting. The eccentric shaft portion 21b forms a crank portion that is eccentric with respect to the main shaft portion 21a and the counter shaft portion 21c.

[0016] The compression mechanism 20 includes a cylinder 23, a rolling piston 22, an upper bearing 24, a lower bearing 25, and a vane 26. The cylinder 23 is formed in a hollow cylindrical shape. The cylinder 23 is fixed to the inner peripheral surface of the housing 10. A cylindrical space, i.e., a cylinder chamber 23a, which is open at both axial ends, is provided inside the cylinder 23.

[0017] The cylinder chamber 23a accommodates the eccentric shaft portion 21b, the rolling piston 22, and the vane 26. The eccentric shaft portion 21b performs eccentric rotational motion within the cylinder chamber 23a in conjunction with the rotation of the rotary shaft 21. The rolling piston 22 is slidably fitted onto the outer periphery of the eccentric shaft portion 21b. The space formed by the inner circumferential surface of the cylinder 23 and the outer circumferential surface of the rolling piston 22 is partitioned by the vane 26.

[0018] A vane groove 23c is formed in the cylinder 23. One end of the vane groove 23c opens into the cylinder chamber 23a. The other end of the vane groove 23c is provided with a back pressure chamber 23b. A vane 26 is housed in the vane groove 23c. The vane 26 reciprocates within the vane groove 23c along the radial direction of the cylinder 23.

[0019] A vane spring (not shown) is provided in the back pressure chamber 23b of the vane groove 23c. Normally, high-pressure refrigerant gas in the housing 10 flows into the back pressure chamber 23b. The pressure difference between the pressure of the refrigerant gas in the back pressure chamber 23b and the pressure of the refrigerant gas in the cylinder chamber 23a generates a force that pushes the vane 26 radially toward the center of the cylinder chamber 23a. The force resulting from this pressure difference and the force of the vane spring pushing the vane 26 radially push the vane 26 radially toward the center of the cylinder chamber 23a. These forces cause one end of the vane 26, i.e., the end on the cylinder chamber 23a side, to abut against the outer peripheral surface of the rolling piston 22. As a result, the space formed by the inner peripheral surface of the cylinder 23 and the outer peripheral surface of the rolling piston 22 is divided into a high-pressure side and a low-pressure side by the vane 26. Even if the pressure difference between the refrigerant gas in the back pressure chamber 23b and the refrigerant gas in the cylinder chamber 23a is not sufficient, the force of the vane spring presses one end of the vane 26 against the outer circumferential surface of the rolling piston 22. Therefore, one end of the vane 26 always abuts against the outer circumferential surface of the rolling piston 22.

[0020] The upper bearing 24 is slidably fitted to the main shaft portion 21a of the rotating shaft 21. The lower bearing 25 is slidably fitted to the sub shaft portion 21c of the rotating shaft 21. As a result, the rotating shaft 21 is rotatably supported by the upper bearing 24 and the lower bearing 25. Sliding portions are formed between the outer circumferential surface of the rotating shaft 21 and the inner circumferential surfaces of the upper bearing 24 and the lower bearing 25.

[0021] The upper bearing 24 also serves as an end plate that closes one axial opening of the cylinder chamber 23 a. The lower bearing 25 also serves as an end plate that closes the other axial opening of the cylinder chamber 23 a. The end face of the cylinder 23 facing one axial direction is in contact with the upper bearing 24. The end face of the cylinder 23 facing the other axial direction is in contact with the lower bearing 25.

[0022] The cylinder 23 is provided with a suction port (not shown) that draws refrigerant gas into the cylinder chamber 23a from outside the housing 10. The upper bearing 24 is provided with a discharge port (not shown) that discharges the compressed refrigerant gas to the outside of the cylinder chamber 23a.

[0023] A discharge valve (not shown) is provided in the discharge port of the upper bearing 24. The discharge valve controls the timing of refrigerant gas discharge. That is, the discharge valve is closed until the pressure of the refrigerant gas in the cylinder chamber 23a rises to a predetermined pressure. When the pressure of the refrigerant gas in the cylinder chamber 23a rises above the predetermined pressure, the discharge valve is opened, and high-temperature, high-pressure refrigerant gas is discharged to the outside of the cylinder chamber 23a through the discharge port.

[0024] Because the suction, compression, and discharge operations are repeated within the cylinder chamber 23a, the refrigerant gas is intermittently discharged from the discharge port. This can cause noise, such as pulsating sounds. To reduce noise, a discharge muffler 27 is attached to the outside of the upper bearing 24, i.e., on the motor 30 side of the upper bearing 24, so as to cover the upper bearing 24. The discharge muffler 27 has a discharge hole. The discharge hole connects the space formed by the discharge muffler 27 and the upper bearing 24 with the space within the housing 10. The refrigerant gas compressed within the cylinder chamber 23a passes through the discharge port and is first discharged into the space formed by the discharge muffler 27 and the upper bearing 24, and then discharged from the discharge hole into the housing 10.

[0025] An intake muffler 101 is provided on the side of the housing 10. The intake muffler 101 is provided on the intake side of the compressor to prevent liquid refrigerant from being drawn into the cylinder chamber 23a. The intake muffler 101 separates the liquid refrigerant from the refrigerant gas, and sends only the refrigerant gas to the cylinder chamber 23a. The intake muffler 101 is connected to the intake port of the cylinder 23 by an intake connecting pipe 101a. The low-pressure refrigerant gas sent from the intake muffler 101 is drawn into the cylinder chamber 23a via the intake connecting pipe 101a.

[0026] In the compression mechanism 20, the rotational motion of the rotary shaft 21 causes the eccentric shaft portion 21b to rotate within the cylinder chamber 23a. This causes the rolling piston 22 to rotate eccentrically along the inner circumferential surface of the cylinder 23. The volume of the working chamber partitioned by the inner circumferential surface of the cylinder 23, the outer circumferential surface of the rolling piston 22, and the vane 26 increases or decreases as the eccentric shaft portion 21b rotates.

[0027] First, when the working chamber and the suction port are connected, low-pressure refrigerant gas is drawn into the working chamber. Next, the suction port is closed, reducing the volume of the working chamber and compressing the refrigerant gas inside the working chamber. Next, the working chamber is connected to the discharge port. When the pressure of the refrigerant gas inside the working chamber reaches a predetermined pressure, the discharge valve opens and the compressed refrigerant gas is discharged outside the cylinder chamber 23a.

[0028] The high-temperature, high-pressure refrigerant gas discharged from cylinder chamber 23a into housing 10 through discharge muffler 27 passes through motor 30 and rises within housing 10. The high-temperature, high-pressure refrigerant gas is discharged to the outside of housing 10 from discharge pipe 102 provided at the top of housing 10. The refrigerant discharged from the compressor circulates through the refrigerant circuit and returns to suction muffler 101.

[0029] In the rotary machine 100 as described above, many sliding parts exist inside the housing 10. The sliding parts are located between the outer peripheral surface of the main shaft portion 21 a and the inner peripheral surface of the upper bearing 24, between the outer peripheral surface of the counter shaft portion 21 c and the inner peripheral surface of the lower bearing 25, between the outer peripheral surface of the rolling piston 22 and the inner peripheral surface of the cylinder 23, and so on.

[0030] Each sliding part is composed of a fixed part and a movable part. The fixed part is a part whose position is fixed relative to the housing 10. The movable part is a part that moves relative to the fixed part. In the case of the sliding part between the outer circumferential surface of the main shaft part 21a and the inner circumferential surface of the upper bearing 24, the upper bearing 24 is the fixed part and the rotating shaft 21 is the movable part. In the case of the sliding part between the outer circumferential surface of the counter shaft part 21c and the inner circumferential surface of the lower bearing 25, the lower bearing 25 is the fixed part and the rotating shaft 21 is the movable part. In the case of the sliding part between the outer circumferential surface of the rolling piston 22 and the inner circumferential surface of the cylinder 23, the cylinder 23 is the fixed part and the rolling piston 22 is the movable part.

[0031] Typical sliding parts include plain bearings and rolling bearings, but also include engine cylinders and liners that slide back and forth. In addition to radial bearings, thrust bearings are also included in sliding parts.

[0032] If an abnormality occurs in these sliding parts, such as deformation of the parts, wear of the parts, or contact between the parts, the rotation of the rotating shaft 21 or the compression of the compression mechanism 20 is hindered, resulting in a decrease in performance and failure of the compressor. Methods for detecting abnormalities in the sliding parts include measuring the vibration amount of the sliding parts using a vibration sensor and measuring the sliding heat using a temperature sensor. Another method for detecting abnormalities in the sliding parts is to use an AE sensor, which can detect abnormalities in the sliding parts with higher sensitivity. The AE sensor is a sensor that measures stress vibration waves (AE waves) that propagate inside parts due to deformation, wear, or contact between parts as AE signals.

[0033] In general rotating machines, including the rotating machine 100 shown in Fig. 1, it is difficult to directly attach the above-mentioned various sensors to components that make up the sliding parts. This makes it difficult to detect abnormalities in the sliding parts with high accuracy. Furthermore, in rotating machines that have many sliding parts, it is difficult to determine which component has an abnormality from the detection signal from a sensor outside the housing.

[0034] In this embodiment, propagation members 40a and 40b are provided inside the housing 10. In this embodiment, when viewed in the axial direction, each of the propagation members 40a and 40b extends linearly in the radial direction. Each of the propagation members 40a and 40b has, for example, a rod-like shape. The propagation members 40a and 40b are members that propagate vibrations, temperature, AE waves, and the like from the fixed parts of the sliding section to the outside of the housing 10. The propagation members 40a and 40b are made of a solid material. Solid materials propagate vibrations, temperature, AE waves, and the like more easily than liquids and gases. Therefore, by providing the propagation members 40a and 40b inside the housing 10, vibrations, temperature, AE waves, and the like are more easily propagated from the fixed parts of the sliding section to the outside of the housing 10.

[0035] The propagation member 40a is provided corresponding to the upper bearing 24. One end of the propagation member 40a is connected to the outer circumferential surface of the upper bearing 24, i.e., the surface of the upper bearing 24 facing radially outward. The other end of the propagation member 40a is connected to the inner wall surface of the housing 10. The propagation member 40a extends in a direction perpendicular to the outer circumferential surface of the upper bearing 24.

[0036] The propagation member 40b is provided corresponding to the lower bearing 25. One end of the propagation member 40b is connected to the outer circumferential surface of the lower bearing 25, i.e., the surface of the lower bearing 25 facing radially outward. The other end of the propagation member 40b is connected to the inner wall surface of the housing 10. The propagation member 40b extends in a direction perpendicular to the outer circumferential surface of the lower bearing 25.

[0037] A sensor 41a is provided on the other end side of the propagation member 40a, outside the housing 10. A sensor 41b is provided on the other end side of the propagation member 40b, outside the housing 10. Each of the sensors 41a and 41b is configured to measure a physical quantity that changes based on the state of the sliding part. Examples of physical quantities that change based on the state of the sliding part include vibration, temperature, and AE waves. The sensors 41a and 41b may be detachably attached to the housing 10. In this case, the sensors 41a and 41b can be attached only when necessary.

[0038] The sensor 41a is provided on the rear side of the surface of the housing 10 that is in contact with the propagation member 40a. The physical quantity that changes based on the state of the sliding part is propagated from the upper bearing 24 via the propagation member 40a to the outside of the housing 10. This allows the physical quantity that changes based on the state of the sliding part to be effectively measured by the sensor 41a.

[0039] Sensor 41b is provided on the rear side of the surface of housing 10 that contacts propagation member 40b. A physical quantity that changes based on the state of the sliding part is propagated from lower bearing 25 via propagation member 40b to the outside of housing 10. This allows sensor 41b to effectively measure the physical quantity that changes based on the state of the sliding part.

[0040] The material of each of the transmission members 40a, 40b is preferably the same as the material of the corresponding fixed component of the sliding section, but may also be other solid materials such as metal, ceramic, or resin. One end of each of the transmission members 40a, 40b and the fixed component of the sliding section are connected by various joining methods, such as welding. One end of each of the transmission members 40a, 40b can be machined into a bolt shape and mechanically connected to the fixed component of the sliding section. Alternatively, one end of each of the transmission members 40a, 40b can be machined into a deformable structure, such as a spring, and connected to the fixed component of the sliding section by simple contact. The other end of each of the transmission members 40a, 40b and the housing 10 can also be connected in a similar manner.

[0041] Here, in a cross section perpendicular to the rotary shaft 21, the rotary shaft 21 is the center, the position of the vane 26 is 0 degrees, and the rotation direction of the rotary shaft 21 (for example, the clockwise direction in FIG. 3 ) is the positive angle, which is defined as the crank angle. In this case, one end of the transmission member 40a is connected to the upper bearing 24 within a crank angle range of 90 degrees to 270 degrees. One end of the transmission member 40b is connected to the lower bearing 25 within a crank angle range of 90 degrees to 270 degrees.

[0042] In this embodiment, the cylinder 23 can also function as a propagation member. In this embodiment, propagation members 40a and 40b are provided separately from the cylinder 23 so that the states of the sliding portion between the upper bearing 24 and the main shaft portion 21a and the sliding portion between the lower bearing 25 and the counter shaft portion 21c can be detected separately. The propagation members 40a and 40b are each separate from the cylinder 23. The propagation members 40a and 40b are not in direct contact with the cylinder 23. This makes it possible to accurately estimate the sliding portion in which an abnormality has occurred based on the measurement results of the physical quantities by each sensor 41a and 41b.

[0043] Methods for attaching each of the sensors 41a and 41b to the housing 10 include mechanical attachment using fixtures such as bolts, attachment using adhesive, and attachment using a magnet if the housing 10 is magnetic.

[0044] In this embodiment, AE sensors that measure AE waves are used as sensors 41a and 41b that detect the state of the sliding portion. AE sensors are a type of elastic wave detection sensor. Elastic wave detection sensors other than AE sensors may be used as sensors 41a and 41b. Elastic wave detection sensors other than AE sensors include acoustic sensors that measure sound pressure, ultrasonic sensors that measure ultrasonic waves, and acceleration sensors that measure vibrations. Furthermore, temperature sensors that measure temperature may be used as sensors 41a and 41b. Examples of temperature sensors include thermocouples. Various other sensors that measure vibration, temperature, or AE waves may also be used as sensors 41a and 41b.

[0045] When acceleration sensors that measure vibrations are used as sensors 41a and 41b, there is a vibration direction in which it is easy to detect abnormalities in the sliding parts. For example, upper bearing 24 in this embodiment is a radial bearing that supports the radial load from rotating shaft 21. Therefore, when using an acceleration sensor to detect wear on upper bearing 24, it is effective to measure the radial component of vibration. Therefore, in this case, it is desirable that one end of transmission member 40a be connected to the outer circumferential surface of upper bearing 24, i.e., the surface of upper bearing 24 that faces radially.

[0046] On the other hand, when using an acceleration sensor to detect wear in a thrust bearing that supports an axial load, it is effective to measure the axial component of vibration, so in this case, it is desirable that one end of the transmission member be connected to the axial surface of the axial bearing.

[0047] Fig. 4 is a schematic diagram showing the positional relationship between the transmission member and the sensor in the rotary machine according to this embodiment. Fig. 5 is a diagram showing the contact surface of the transmission member and the measurement surface of the sensor in the rotary machine according to this embodiment as viewed in the radial direction. In Figs. 4 and 5, the contact surface 40a1 of the transmission member 40a that contacts the housing 10 and the measurement surface 41a1 of the sensor 41a are hatched. While Figs. 4 and 5 illustrate the transmission member 40a and the sensor 41a, the same applies to the transmission member 40b and the sensor 41b.

[0048] 4 and 5, the sensor 41a has a planar measurement surface 41a1. The measurement surface 41a1 of the sensor 41a and the contact surface 40a1 of the propagation member 40a face each other at least partially across the housing 10. Specifically, when a line 40a3 is defined as a line extending from an arbitrary point 40a2 on the contact surface 40a1 perpendicular to the contact surface 40a1, the measurement surface 41a1 has an intersection 41a2 where the line 40a3 intersects with the line 40a3.

[0049] 6 is a schematic diagram showing another example of the positional relationship between the transmission member and the sensor in the rotary machine according to this embodiment. While the transmission member 40a and the sensor 41a are illustrated in FIG. 6, the same applies to the transmission member 40b and the sensor 41b. As shown in FIG. 6, the contact surface 40a1 of the transmission member 40a and the measurement surface 41a1 of the sensor 41a do not face each other across the housing 10, but are spaced apart from each other in the axial direction.

[0050] Another component connected to the housing 10 and the fixed component of the sliding section is the cylinder 23. That is, the inner peripheral end of the cylinder 23 is connected to the upper bearing 24, and the outer peripheral end of the cylinder 23 is connected to the housing 10. The cylinder 23 has a contact surface 23d that contacts the housing 10. The measurement surface 41a1 of the sensor 41a is installed between the contact surface 23d of the cylinder 23 and the contact surface 40a1 of the propagation member 40a. In this case, the shortest distance along the surface of the housing 10 between the measurement surface 41a1 of the sensor 41a and the contact surface 40a1 of the propagation member 40a is defined as L1, and the shortest distance along the surface of the housing 10 between the contact surface 40a1 of the propagation member 40a and the contact surface 23d of the cylinder 23 is defined as L2. The sensor 41a is positioned so that L1 is less than half of L2. This can also be applied to other components connected to the housing 10. This allows the sensor 41a to measure the physical quantity propagating through the propagation member 40a with high accuracy.

[0051] Fig. 7 is a block diagram showing the configuration of a rotating machine system according to this embodiment. As shown in Fig. 7, a rotating machine system 110 includes a rotating machine 100, a determination unit 111, and an alarm issuing unit 112. The determination unit 111 and the alarm issuing unit 112 may be configured by a computer including a CPU, ROM, RAM, etc., or may be configured by wired sequence logic.

[0052] The determination unit 111 receives measurement signals from the sensors 41 a and 41 b of the rotating machine 100 and determines whether or not an abnormality exists in each sliding part of the rotating machine 100 based on the measurement signals. For example, the determination unit 111 acquires waveform information of the AE waves in the corresponding sliding part based on the signals received from the sensors 41 a and 41 b. When the determination unit 111 determines that an abnormality has occurred in any of the sliding parts, it transmits an alarm issuance command to the alarm issuing unit 112. For example, when the amplitude level of the AE waves in each sliding part exceeds a threshold value, the determination unit 111 determines that an abnormality exists in that sliding part.

[0053] Based on an alarm issuance command from the determination unit 111, the alarm issuing unit 112 issues an alarm signal indicating that there is an abnormality in the sliding part, a measurement signal by the determination unit 111, and a determination result to a wired or wireless transmission path 113. The alarm signal issued from the alarm issuing unit 112, the measurement signal by the determination unit 111, and a determination result are notified to a user of the rotating machine 100, a distributor of the rotating machine 100, a maintenance company for the rotating machine 100, or the like, via the transmission path 113. Furthermore, the alarm signal indicating that there is an abnormality in the sliding part, the measurement signal by the determination unit 111, and a determination result may be stored in a storage unit such as a storage unit installed in the rotating machine 100 or a data server on the cloud.

[0054] The determination unit 111 and the alarm issuing unit 112 may be constantly connected to the rotating machine 100, or may be temporarily connected to the rotating machine 100 as needed. When the determination unit 111 and the alarm issuing unit 112 are constantly connected to the rotating machine 100, the state of the sliding part can be constantly monitored. When the determination unit 111 and the alarm issuing unit 112 are connected to the rotating machine 100 as needed, the state of the sliding part can be monitored when the rotating machine 100 malfunctions. Furthermore, alarm signals indicating an abnormality in the sliding part, measurement signals by the determination unit 111, and information associated with the determination results and information such as the operating history, which are stored in a memory unit installed in the rotating machine 100 or a data server on the cloud, can be used for maintenance of the rotating machine 100 by utilizing machine learning or the like.

[0055] As described above, the rotary machine 100 according to this embodiment includes the housing 10, the upper bearing 24, the lower bearing 25, the sensor 41a, the sensor 41b, and the propagation member 40a, the propagation member 40b. The housing 10 accommodates at least a portion of the rotating shaft 21 and the upper bearing 24 and the lower bearing 25 that support the rotating shaft 21. The upper bearing 24 and the lower bearing 25 are provided inside the housing 10. The upper bearing 24 and the lower bearing 25 are examples of fixed components that constitute a sliding part. The sensors 41a and 41b are configured to measure a physical quantity that changes based on the state of the sliding part. One end of the propagation member 40a is connected to the upper bearing 24. One end of the propagation member 40b is connected to the lower bearing 25. The other end of each of the propagation members 40a and 40b is connected to the housing 10. The sensor 41a is provided on the other end of the propagation member 40a, outside the housing 10. The sensor 41b is provided on the other end side of the propagation member 40b and outside the housing 10.

[0056] With this configuration, a physical quantity that changes based on the state of the sliding portion between upper bearing 24 and rotating shaft 21 can be propagated toward sensor 41a by propagation member 40a. Also, a physical quantity that changes based on the state of the sliding portion between lower bearing 25 and rotating shaft 21 can be propagated to sensor 41b by propagation member 40b. Therefore, each of sensors 41a and 41b can measure the physical quantity that changes based on the state of the sliding portion from outside housing 10 with high accuracy. Therefore, the state of the sliding portion can be detected with high accuracy.

[0057] In the rotary machine 100 according to this embodiment, the sensor 41 a and the sensor 41 b are detachably attached to the housing 10 .

[0058] According to this configuration, by attaching and detaching the sensors 41a and 41b, it is possible to detect the state of the sliding portion only when necessary.

[0059] In the rotary machine 100 according to this embodiment, the sensor 41a is provided on the rear surface of the housing 10 at a portion where the other end of the propagation member 40a contacts the housing 10. The sensor 41b is provided on the rear surface of the portion where the other end of the propagation member 40b contacts the housing 10.

[0060] According to this configuration, the physical quantities propagated by the propagation members 40a and 40b can be measured with higher accuracy.

[0061] In the rotary machine 100 according to this embodiment, the transmission member 40a has a contact surface 40a1 that is in contact with the housing 10. The measurement surface 41a1 of the sensor 41a has an intersection 41a2 where the measurement surface 41a1 intersects with a line 40a3 that extends from a point 40a2 within the contact surface 40a1 perpendicular to the contact surface 40a1. The same applies to the transmission member 40b and the sensor 41b.

[0062] According to this configuration, the physical quantity propagated by the propagation member 40a can be measured with higher accuracy.

[0063] In the rotary machine 100 according to this embodiment, when viewed in a direction along the rotary shaft 21, the transmission member 40a and the transmission member 40b each extend in a radial direction with the rotary shaft 21 as the center.

[0064] According to this configuration, the physical quantity that changes based on the state of the sliding portion can be effectively transmitted to the sensor 41b by the transmission member 40b.

[0065] The rotary machine 100 according to this embodiment further includes a cylinder 23 connected to the housing 10 and to an upper bearing 24 or a lower bearing 25, which is a fixed component of the sliding part. The cylinder 23 is an example of another component. The transmission member 40a has a contact surface 40a1 in contact with the housing 10. The contact surface 40a1 is an example of a first contact surface. The cylinder 23 has a contact surface 23d in contact with the housing 10. The contact surface 23d is an example of a second contact surface. A distance L1 along the surface of the housing 10 between the measurement surface 41a1 of the sensor 41a and the contact surface 40a1 is less than half of a distance L2 along the surface of the housing 10 between the measurement surface 41a1 and the contact surface 23d.

[0066] According to this configuration, the physical quantity propagated by the propagation member 40a can be measured with higher accuracy.

[0067] In the rotating machine 100 according to this embodiment, the sensor 41 a and the sensor 41 b are each an elastic wave detection sensor or a temperature sensor. The elastic wave detection sensor includes an AE sensor, an acoustic sensor, an ultrasonic sensor, and a vibration sensor.

[0068] Vibrations, temperature, AE waves, etc. are easily propagated by the propagation members 40a and 40b made of solid materials. Therefore, with this configuration, it is possible to measure with high accuracy physical quantities that change based on the state of the sliding portion.

[0069] The rotary machine 100 according to this embodiment further includes a compression mechanism 20 provided inside the housing 10. The compression mechanism 20 includes a cylinder 23, a rolling piston 22, and a vane 26. A vane groove 23c is formed in the cylinder 23. The rolling piston 22 rotates eccentrically along the inner circumferential surface of the cylinder 23 by a crank portion of the rotary shaft 21. The vane 26 reciprocates within the vane groove 23c, separating the space between the inner circumferential surface of the cylinder 23 and the rolling piston 22. In a cross section perpendicular to the rotary shaft 21, the rotary shaft 21 is centered, the position of the vane 26 is defined as 0 degrees, and the rotation direction of the rotary shaft 21 is defined as a positive angle, which is defined as the crank angle. In this case, one end of the transmission member 40a is connected to a portion of the upper bearing 24 within a crank angle range of 90 degrees to 270 degrees. One end of the transmission member 40b is connected to the lower bearing 25 in a crank angle range of 90 degrees or more and 270 degrees or less.

[0070] In a rotary compressor having the compression mechanism 20 described above, the load applied to the bearing from the rotating shaft 21 increases within a crank angle range of 90 degrees to 270 degrees. Therefore, wear and deformation of the bearing increase within this crank angle range. Therefore, by measuring physical quantities within this crank angle range, the state of the sliding parts can be more appropriately detected.

[0071] A rotating machine system 110 according to this embodiment includes a rotating machine 100, a determination unit 111, and an alarm issuing unit 112. The determination unit 111 is configured to determine whether or not an abnormality exists in the sliding part based on a physical quantity measured by a sensor. The alarm issuing unit 112 is configured to issue an alarm signal indicating that an abnormality exists in the sliding part based on a command from the determination unit 111.

[0072] According to this configuration, it is possible to notify the outside that there is an abnormality in the sliding portion.

[0073] In the rotating machine system 110 according to this embodiment, the determination unit 111 is configured to issue a determination result of whether or not there is an abnormality in the sliding part based on the physical quantity measured by the sensor, a command result to the alarm issuing unit 112, or the physical quantity measured by the sensor, to a wired or wireless transmission path. The alarm issuing unit 112 is configured to issue an alarm signal to the wired or wireless transmission path 113.

[0074] According to this configuration, it is possible to notify a user, a distributor, a maintenance company, or the like, who is located away from the rotating machine 100, that there is an abnormality in the sliding part.

[0075] The rotating machine system 110 according to this embodiment transmits the determination result, command result, or measured physical quantity of the determination unit 111 and the alarm signal of the alarm issuing unit 112 to a wired or wireless transmission path 113, and stores the information in a storage unit. With this configuration, this information can be used for maintenance of the rotating machine 100 by utilizing machine learning or the like.

[0076] Second Embodiment A rotary machine according to the second embodiment will be described. Fig. 8 is a longitudinal cross-sectional view showing the configuration of the rotary machine according to the present embodiment. As shown in Fig. 8, the transmission member 40a is formed integrally with the upper bearing 24. The transmission member 40b is formed integrally with the lower bearing 25. In this embodiment, the transmission member 40a and the transmission member 40b have an annular shape centered on the rotating shaft 21. The other configurations are the same as those in the first embodiment.

[0077] As described above, in the rotary machine 100 according to the present embodiment, the transmission member 40a is formed integrally with the upper bearing 24. The transmission member 40b is formed integrally with the lower bearing 25. The upper bearing 24 and the lower bearing 25 are examples of fixed components.

[0078] This configuration eliminates contact between the surfaces of the fixed part of the sliding part and the propagation member, thereby reducing attenuation of physical quantities such as vibration, temperature, and AE waves, and improving propagation efficiency. Therefore, the measurement accuracy of physical quantities can be improved. Furthermore, depending on the fixed part, assembly can be improved by managing the fit with the housing 10.

[0079] Third Embodiment A rotary machine according to the third embodiment will be described. FIG. 9 is a longitudinal cross-sectional view showing the configuration of the rotary machine according to the present embodiment. As shown in FIG. 9, the transmission member 40a is formed integrally with the housing 10. Similarly, the transmission member 40b is formed integrally with the housing 10. That is, the housing 10 has a structure in which a cylindrical housing body, a transmission member 40a protruding inward from the housing body toward the upper bearing 24, and a transmission member 40b protruding inward from the housing body toward the lower bearing 25 are integrated. In this embodiment, the transmission member 40a and the transmission member 40b have an annular shape centered on the rotating shaft 21. The other configurations are the same as those of the first embodiment.

[0080] As described above, in the rotary machine 100 according to this embodiment, the transmission member 40 a and the transmission member 40 b are formed integrally with the housing 10 .

[0081] This configuration eliminates contact between the surfaces of the propagation member and the housing, thereby reducing attenuation of physical quantities such as vibration, temperature, and AE waves, and improving propagation efficiency. This improves the measurement accuracy of physical quantities. Furthermore, because a portion of the housing 10 is thickened, the moment of inertia of the housing 10 increases, resulting in increased rigidity and reduced vibration of the housing 10.

[0082] Fourth Embodiment A rotary machine according to a fourth embodiment will be described. FIG. 10 is a longitudinal cross-sectional view showing the configuration of a rotary machine according to this embodiment. As shown in FIG. 10, an opening 10a is formed in the side surface of the housing 10. The propagation member 40a passes through the opening 10a from the outside to the inside of the housing 10. The opening end of the opening 10a is in close contact with the outer circumferential surface of the other end side of the propagation member 40a over the entire circumference. This ensures the airtightness of the housing 10. It is preferable to use welding to join the opening end of the opening 10a and the propagation member 40a. However, various joining methods other than welding can be used as long as they can ensure the airtightness required for the housing 10.

[0083] The propagation member 40a has a tapered shape to facilitate insertion into the opening 10a. That is, one end of the propagation member 40a is thinner than the other end. One end of the propagation member 40a is connected to the outer circumferential surface of the upper bearing 24. The sensor 41a is directly attached to the other end of the propagation member 40a. The sensor 41a can be attached to the propagation member 40a by a mechanical connection method using a jig such as a bolt, a mechanical attachment method using a jig such as a bolt, an attachment method using an adhesive, or an attachment method using a magnet if the propagation member 40a is magnetic.

[0084] As described above, in the rotary machine 100 according to this embodiment, the opening 10a is formed in the housing 10. The propagation member 40a passes through the opening 10a from the outside to the inside of the housing 10. The propagation member 40a is in close contact with the open end of the opening 10a over the entire periphery.

[0085] This configuration facilitates the manufacturing of the rotary machine 100 and ensures the airtightness of the housing 10. Furthermore, since the sensor 41a can be directly attached to the propagation member 40a, the detection accuracy can be improved.

[0086] Fifth Embodiment A rotating machine according to a fifth embodiment will be described. Fig. 11 is a side view showing the configuration of the rotating machine according to this embodiment. As shown in Fig. 11, a sign 50 is provided on the exterior side surface of the housing 10. The sign 50 indicates the mounting position where the sensor 41a (not shown in Fig. 11) should be mounted, or the position on the other end side of the propagation member 40a.

[0087] The sign 50 has a sign body 50a. The sign body 50a is provided, for example, at a position corresponding to the other end side of the propagation member 40a. In this embodiment, the sensor 41a is attached when the rotating machine 100 is manufactured or during maintenance after the rotating machine 100 has started to be used. When the sensor 41a is attached to the sign body 50a, the sensor 41a is disposed at a position corresponding to the other end side of the propagation member 40a. This allows the sensor 41a to measure with high accuracy, from outside the housing 10, a physical quantity that changes based on the state of the sliding part.

[0088] The sign 50 may have a text display 50b. The text display 50b is provided adjacent to the sign body 50a. The text display 50b indicates, in text information, that the sign body 50a represents the installation position of the sensor 41a.

[0089] Fig. 12 is a side view showing another example of the configuration of the rotary machine according to this embodiment. The sign 50 shown in Fig. 12 has an auxiliary sign 50c. The auxiliary sign 50c indicates, together with the character display 50b, that the sign body 50a indicates the installation position of the sensor 41a.

[0090] As described above, the rotary machine 100 according to this embodiment includes the housing 10, the upper bearing 24, and the transmission member 40a. The housing 10 accommodates at least a portion of the rotating shaft 21 and the upper bearing 24 that supports the rotating shaft 21. The upper bearing 24 is provided inside the housing 10. The upper bearing 24 is an example of a fixed component that constitutes a sliding part. One end of the transmission member 40a is connected to the upper bearing 24. The other end of the transmission member 40a is connected to the housing 10. A mark 50 indicating the mounting position of the sensor 41a or the position of the transmission member 40a is provided on the other end of the transmission member 40a, outside the housing 10.

[0091] According to this configuration, by attaching the sensor 41a to the marker 50, the sensor 41a can be disposed at a position corresponding to the other end of the propagation member 40a. Therefore, the sensor 41a can be easily attached at a position where it can measure with high accuracy the physical quantity that changes based on the state of the sliding portion.

[0092] The rotary machine 100 according to this embodiment further includes a sensor 41a. The sensor 41a is attached at a position where the marker 50 is provided.

[0093] According to this configuration, the physical quantity that changes based on the state of the sliding portion can be measured with high accuracy from outside the housing 10.

[0094] Sixth Embodiment A rotary machine according to a sixth embodiment will be described. Fig. 13 is a side view showing the configuration of the propagation member in the rotary machine according to this embodiment. As shown in Fig. 13, multiple types of sensors 41a, 41c are attached to the other end of the propagation member 40a. For example, the sensor 41a is a sensor that measures the AE wave propagating from the sliding portion via the propagation member 40a. Furthermore, for example, the sensor 41c is a sensor that measures the temperature propagating from the sliding portion via the propagation member 40a.

[0095] According to this embodiment, it is possible to measure a plurality of types of physical quantities propagated from the sliding portion via the propagation member 40a, and therefore it is possible to detect an abnormality in the sliding portion with higher accuracy.

[0096] 10 Housing, 10a Opening, 20 Compression mechanism, 21 Rotating shaft, 21a Main shaft portion, 21b Eccentric shaft portion, 21c Sub-shaft portion, 22 Rolling piston, 23 Cylinder, 23a Cylinder chamber, 23b Back pressure chamber, 23c Vane groove, 23d Contact surface, 24 Upper bearing, 25 Lower bearing, 26 Vane, 27 Discharge muffler, 30 Electric motor, 40a Transmission member, 40a1 Contact surface, 40a2 Point, 40a3 Straight line, 40b Transmission member, 41a Sensor, 41a1 Measurement surface, 41a2 Intersection, 41b Sensor, 41c Sensor, 50 Sign, 50a Sign body, 50b Character display, 50c Auxiliary sign, 100 Rotating machine, 101 Intake muffler, 101a Intake connecting pipe, 102 Discharge pipe, 110 rotating machine system, 111 determination unit, 112 alarm issuing unit, 113 transmission line.

Claims

1. A rotating machine comprising: a housing that houses at least a part of a rotating shaft and a bearing that supports said rotating shaft; a fixed part that is provided inside said housing and that constitutes a sliding part; a sensor that measures a physical quantity that changes based on the state of said sliding part; and a transmission member that has one end connected to said fixed part and the other end connected to said housing, wherein said sensor is provided on the other end of said transmission member outside said housing.

2. A rotary machine according to claim 1, wherein said sensor is detachably attached to said housing.

3. A rotary machine according to claim 1 or 2, wherein the sensor is provided on the rear side of the part of the housing that is in contact with the other end of the transmission member.

4. A rotary machine according to any one of claims 1 to 3, wherein the transmission member has a contact surface that is in contact with the housing, and the measurement surface of the sensor has an intersection point where it intersects with a line that extends from a point within the contact surface perpendicular to the contact surface.

5. A rotary machine according to any one of claims 1 to 4, wherein, when viewed in a direction along the rotational axis, the transmission member extends in a radial direction centered on the rotational axis.

6. A rotary machine according to claim 5, further comprising another member connected to the fixed part and the housing, wherein the transmission member has a first contact surface in contact with the housing, and the other member has a second contact surface in contact with the housing, and the distance along the surface of the housing between the measurement surface of the sensor and the first contact surface is not more than half the distance along the surface of the housing between the measurement surface and the second contact surface.

7. A rotary machine according to any one of claims 1 to 6, wherein the transmission member is formed integrally with the fixed component.

8. A rotary machine according to any one of claims 1 to 6, wherein the transmission member is formed integrally with the housing.

9. A rotating machine according to any one of claims 1 to 8, wherein the sensor is an elastic wave detection sensor or a temperature sensor.

10. A rotary machine according to any one of claims 1 to 9, wherein an opening is formed in the housing, the transmission member passes through the opening from the outside to the inside of the housing, and the open end of the opening is in close contact with the transmission member over the entire circumference.

11. A rotary machine according to any one of claims 1 to 10, further comprising a compression mechanism provided inside the housing, wherein the compression mechanism has: a cylinder in which a vane groove is formed; a rolling piston that rotates eccentrically along the inner circumferential surface of the cylinder by a crank portion of the rotating shaft; and a vane that reciprocates inside the vane groove and separates a space between the inner circumferential surface of the cylinder and the rolling piston; wherein the fixed part is the bearing; and wherein, in a cross section perpendicular to the rotating shaft, when the angle centered on the rotating shaft, the position of the vane is 0 degrees, and the rotation direction of the rotating shaft is positive, is defined as a crank angle, one end side of the transmission member is connected to a part of the bearing within the crank angle range of 90 degrees or more and 270 degrees or less.

12. A rotating machine comprising: a housing that houses at least a portion of a rotating shaft and a bearing that supports said rotating shaft; a fixed part that is provided inside said housing and that constitutes a sliding part; and a transmission member that has one end connected to said fixed part and the other end connected to said housing, wherein at the other end of said transmission member, outside said housing, there is provided an attachment position for a sensor that measures a physical quantity that changes based on the state of said sliding part, or a mark indicating the position of said transmission member.

13. The rotary machine of claim 12, further comprising the sensor mounted at the location where the mark is provided.

14. A rotating machine system comprising: a rotating machine according to any one of claims 1 to 13; a determination unit that determines whether or not there is an abnormality in the sliding part based on the physical quantity measured by the sensor; and an alarm issuing unit that issues an alarm signal indicating that there is an abnormality in the sliding part based on a command from the determination unit.

15. A rotating machine system as described in claim 14, wherein the judgment unit issues a judgment result based on the physical quantity measured by the sensor as to whether or not there is an abnormality in the sliding part, a command result to the alarm issuing unit, or the physical quantity measured by the sensor to a wired or wireless transmission path, and the alarm issuing unit issues the alarm signal to a wired or wireless transmission path.

16. A rotating machine system according to claim 15, wherein the judgment result, the command result, or the measured physical quantity of the judgment unit and the alarm signal of the alarm issuing unit are transmitted to a wired or wireless transmission path, and the information is stored in a memory unit.

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