JP2020165344A - pump - Google Patents

Abstract

To detect a position of a rotor with respect to a bearing with high accuracy.SOLUTION: A pump comprises: a pump body including a casing and a rotor which is disposed inside of the casing and to which an impeller is fixed; and a bearing device which supports the rotor of the pump body in a rotatable manner. The bearing device includes: a storage part in which a lubricant is stored; an oil ring which is wound around the rotor and partially brought into contact with the storage part; a bearing box in which the storage part is provided, which incorporates the oil ring and in which a supporting surface forming an oil film is formed between the bearing box and the rotor; a temperature detection section for detecting a temperature of the bearing box at two or more positions in the bearing box around the rotor; a position detection section which detects a position of the rotor with respect to the bearing box; and a control device which calculates the position of the rotor by correcting positional information detected by the position detection section based on a detection result of the temperature detection section.SELECTED DRAWING: Figure 3

Description

The present invention relates to a pump that feeds a liquid.

A centrifugal pump is known in which the sucked liquid is made to flow in the radial direction with respect to the rotation shaft of the impeller and discharged. The centrifugal pump is connected to a rotating shaft in which an impeller housed in a casing is connected to an electric motor. In the centrifugal pump, when the impeller is rotated by a drive such as an electric motor via a rotating shaft, the liquid forms a rotating flow due to the rotation of the impeller, and the centrifugal force of the rotating flow causes the impeller from the suction port of the casing. The liquid is sucked into the inside of the impeller, and the liquid sucked into the impeller is discharged from the discharge port of the casing. In such a pump, a rotating shaft (rotor) is rotatably supported by a bearing with respect to a housing (stator).

As a bearing, there is a self-lubricating type slide bearing. References 1 include a shaft, a bearing metal that supports the shaft, an oil ring that is suspended from the shaft and scoops up oil below the shaft by rotating with the rotation of the shaft, and an oil ring. A self-lubricating bearing with a tapering space including the outer surface of the bearing is described.

JP-A-2016-191437

In the self-lubricating type bearing, the oil ring is rotated together with the rotor to supply the lubricating oil of the lubricating oil storage portion in contact with the oil ring to the bearing. Therefore, the oil film formed is thinner than the bearing that forcibly supplies the lubricating oil. Therefore, if the gap between the bearing and the rotor becomes narrow and one-sided contact with the bearing occurs due to the misalignment of the rotor, the bearing may be damaged. Therefore, when a misalignment occurs, it is necessary to detect the misalignment, adjust the operating conditions, and stop the pump. However, an error occurs in the detection due to various influences of the operating conditions, and if the state of operating at an appropriate position is detected as a misalignment, unnecessary stoppage and suppression of the operating conditions occur. Therefore, it is required to accurately detect the position of the rotor with respect to the bearing.

The present invention solves the above-mentioned problems, and an object of the present invention is to provide a pump capable of detecting the position of a rotor with respect to a bearing with high accuracy.

The present invention for solving the above-mentioned problems is a pump, the pump main body including the passenger compartment, a rotor arranged inside the passenger compartment and to which an impeller is fixed, and a rotor of the pump main body. The bearing device has a bearing device that rotatably supports the bearing device, and the bearing device includes a storage portion in which lubricating oil is stored, an oil ring that is hung on the rotor and is partially in contact with the storage portion, and the storage portion. A bearing box provided with a built-in oil ring and a support surface forming an oil film between the bearing box and the rotor, and detection of the bearing box at two or more positions around the rotor of the bearing box. Based on the detection results of the temperature detection unit, the position detection unit that detects the position of the rotor with respect to the bearing box, and the detection result of the temperature detection unit, the position information detected by the position detection unit is corrected to correct the position of the rotor. It is characterized by including a control device for calculating.

It is preferable that the temperature detection unit is arranged closer to the pump body than the oil ring of the bearing box.

Further, the control device calculates the axial center position as the position of the rotor, and when it is determined that the axial center position is in the warning area, outputs warning information, and the axial center position is the warning area. When it is determined that the pump body is in the danger region, which is a region having a larger deviation than the above, it is preferable to stop the pump body.

Further, it is preferable that the position detection unit is inserted into the bearing box and fixed to the bearing box with a material having a coefficient of linear expansion smaller than that of the bearing box.

Further, it is preferable that the position detecting unit detects the position of the rotor at three or more places including two facing places in the rotation direction of the rotor.

According to the present invention, the position of the rotor can be detected with high accuracy.

FIG. 1 is a front view of a pump according to an embodiment of the present invention. FIG. 2 is a side view of the pump according to the present embodiment of the present invention. FIG. 3 is a cross-sectional view taken along the line AA of FIG. FIG. 4 is a cross-sectional view taken along the line BB of FIG. FIG. 5 is a cross-sectional view taken along the line CC of FIG. FIG. 6 is a block diagram showing a schematic configuration of the control device. FIG. 7 is a schematic diagram showing an example of a criterion for judgment based on the detection result.

Hereinafter, the present invention will be described in detail with reference to the drawings. The present invention is not limited to the contents described in the following embodiments. In addition, the components in the following embodiments include those that can be easily assumed by those skilled in the art, or those that are substantially the same, that is, those having a so-called equal range. Further, the constituent elements disclosed in the following embodiments can be appropriately combined without departing from the gist of the present invention.

The pump 10 according to this embodiment will be described with reference to the drawings. FIG. 1 is a front view of the pump 10 according to the present embodiment of the present invention. FIG. 2 is a side view of the pump 10 according to the present embodiment of the present invention. FIG. 3 is a cross-sectional view taken along the line AA of FIG. The pump 10 is connected to two pipelines and sends water from one connected pipeline to the other pipeline. In the present embodiment, the fluid transferred by the pump 10 is assumed to be water, but the present invention is not limited to this. The fluid transferred by the pump 10 may be a liquid. For example, the present invention is applicable even when the fluid transferred by the pump 10 is oil.

The pump 10 includes a pump main body 11, a first bearing device 50, and a second bearing device 60. The pump main body 11 has a casing (vehicle compartment) 12, a suction chamber 28, a discharge chamber 30, a spindle 32, and an impeller 34. The pump 10 in the present embodiment is a double-suction centrifugal pump on the horizontal axis, but is not limited thereto. The pump 10 may be a centrifugal pump, for example, a multi-stage pump or a turbine pump.

The casing 12 has a lower casing 14 and an upper casing 16. The casing 12 is a container that houses the spindle 32 and the impeller 34, which will be described later. The casing 12 is configured to be divisible into a lower casing 14 and an upper casing 16. In the casing 12, a suction chamber 28 and a discharge chamber 30, which are water flow paths, are formed inside. The suction chamber 28 and the discharge chamber 30 will be described later.

As shown in FIG. 2, the lower casing 14 is formed with a suction port 18 and a discharge port 20. The suction port 18 is an opening formed in the lower casing 14. The suction port 18 is formed so as to communicate with the suction chamber 28. A flange portion 19 is formed on the outer periphery of the suction port 18. The flange portion 19 is connected to a pipe (not shown) that is a source of the liquid. The discharge port 20 is an opening formed in the lower casing 14. The discharge port 20 is formed so as to communicate with the discharge chamber 30. A flange portion 21 is formed on the outer periphery of the discharge port 20. The flange portion 21 is connected to a pipe (not shown) to which the liquid is supplied.

As shown in FIG. 3, the upper casing 16 has air bleeding nozzles 22, 24, and 26 formed at the uppermost portion of the suction chamber 28 and the uppermost portion of the discharge chamber 30. The air bleeding nozzles 22, 24, and 26 are nozzles that allow the air inside the casing 12 to escape when water is filled inside the casing 12. The upper casing 16 is fixed to the lower casing 14 using, for example, bolts and nuts.

The suction chamber 28 is a water flow path formed in a spiral shape inside the casing 12. The suction chamber 28 is formed so as to communicate with the suction port 18. The suction chamber 28 communicates with the discharge chamber 30 via an impeller 34, which will be described later.

The discharge chamber 30 is a water flow path formed in a spiral shape inside the casing 12. The discharge chamber 30 is formed so as to communicate with the discharge port 20. The discharge chamber 30 communicates with the suction chamber 28 via the impeller 34.

The spindle 32 is a rotating shaft of the impeller 34. As shown in FIG. 3, the spindle 32 is arranged so as to penetrate the casing 12. The spindle 32 is rotatably supported by the first bearing device 50 and the second bearing device 60, which will be described later. As shown in FIG. 3, the end of the motor side 40 of the spindle 32 is connected to the motor spindle 44 by a shaft joint 42. Here, the electric motor spindle 44 is a rotating shaft of the electric motor 46.

The impeller 34 is a double suction type centrifugal impeller. The impeller 34 is fixed to the spindle 32 as shown in FIG. The impeller 34 is housed inside the casing 12, as shown in FIG. The impeller 34 includes impeller suction ports 36 and 36, an impeller discharge port 38, and an impeller internal flow path 39.

The impeller suction ports 36, 36 are openings formed in the impeller 34. The impeller suction ports 36, 36 are formed at both ends of the spindle 32 in the thrust direction, as shown in FIG. As shown in FIG. 3, the impeller suction ports 36 and 36 are formed so as to communicate with the suction chamber 28 and the impeller internal flow path 39.

The impeller discharge port 38 is an opening formed in the impeller 34. As shown in FIG. 3, the impeller discharge port 38 is formed in the radial direction of the spindle 32. As shown in FIG. 3, the impeller discharge port 38 is formed so as to communicate with the impeller internal flow path 39 and the discharge chamber 30.

The impeller internal flow path 39 is a water flow path formed inside the impeller 34. As shown in FIG. 3, the impeller internal flow path 39 communicates with the suction chamber 28 via the impeller suction ports 36, 36. As shown in FIG. 3, the impeller internal flow path 39 communicates with the discharge chamber 30 via the impeller discharge port 38.

Next, the operation of the pump body 11 will be described. The impeller 34 is rotated by an electric motor 46 via a spindle 32. The water in the impeller internal flow path 39 forms a rotating flow with the main shaft 32 as the rotation axis by rotating the impeller 34. The water pressure in the vicinity of the impeller discharge port 38 rises due to the centrifugal force generated from the rotating flow. The liquid in the impeller internal flow path 39 is discharged to the discharge chamber 30 through the impeller discharge port 38, which has become high pressure due to the rotating flow. That is, the impeller 34 discharges the water in the suction chamber 28 to the discharge chamber 30 by the centrifugal force generated from the rotational flow. A part of the liquid discharged into the discharge chamber 30 flows into the suction chamber 28 through the gap between the casing 12 and the impeller 34. The liners 70 and 72 narrow the gap between the casing 12 and the impeller 34, and prevent water from flowing into the suction chamber 28 through the gap between the casing 12 and the impeller 34. The remaining liquid discharged into the discharge chamber 30 is discharged to a pipe (not shown), which is a water supply destination, through the discharge port 20. Here, the water flowing inside the discharge chamber 30 flows at a higher flow velocity than the water flowing through the suction chamber 28. Here, the water flowing through the region surrounded by the inner wall of the discharge chamber 30 and the shroud surface 35 flows at a higher flow velocity than the other water flowing through the discharge chamber 30. Specifically, the water flowing through the region surrounded by the inner wall of the discharge chamber 30 and the shroud surface 35 forms a high-speed rotating flow with the main shaft 32 as the rotation axis due to the high-speed rotation of the shroud surface 35.

Next, the first bearing device 50 will be described with reference to FIGS. 4 to 7 in addition to FIG. FIG. 4 is a cross-sectional view taken along the line BB of FIG. FIG. 5 is a cross-sectional view taken along the line CC of FIG. FIG. 6 is a block diagram showing a schematic configuration of the control device. FIG. 7 is a schematic diagram showing an example of a criterion for judgment based on the detection result.

As shown in FIG. 3, the first bearing device 50 rotatably supports the end portion of the spindle 32 opposite to the electric motor side 40. As shown in FIGS. 3 and 4, the first bearing device 50 accommodates an end portion of the spindle 32 opposite to the motor side 40. The first bearing device 50 is a self-lubricating slide bearing, and has a bearing box 52, an oil ring 54, a storage unit (lubricating oil storage unit) 56, and a cooling mechanism 58. Further, as shown in FIG. 5, the first bearing device 50 includes a control device 100, an output device 101, and a sensor unit 102.

The bearing box 52 is a member on the fixed side that houses the oil ring 54 and the storage portion (lubricating oil storage portion) 56, and is fixed to the lower casing 14 by using, for example, bolts and nuts.
In the bearing box 52, a portion adjacent to the oil ring 54 in the axial direction serves as a pressure receiving surface 52a that covers the outer periphery of the main shaft 32. The pressure receiving surface 52a is a surface to which lubricating oil is supplied from the main shaft 32, and supports the main shaft 32 via the lubricating oil. Further, the bearing box 52 is provided with heat radiation fins 52b.

The oil ring 54 is a member on the ring, and the main shaft 32 is inserted therein. The oil ring 54 is hung on the spindle 32. A part of the oil ring 54 on the lower side in the vertical direction is in contact with the lubricating oil stored in the storage portion 56. The oil ring 54 preferably has a groove for holding lubricating oil on the inner peripheral side of the ring. The oil ring 54 is placed in the axial direction of the main shaft 32 and is sandwiched between the pressure receiving surface 52a, and the axial position is regulated by the pressure receiving surface 52a and the bearing box 52. The oil ring 54 is in contact with the spindle 32. When the main shaft 32 rotates, a part of the rotational force of the main shaft 32 is transmitted by frictional force or the like, and the oil ring 54 rotates in accordance with the rotation of the main shaft 32.

The storage portion 56 is provided inside the bearing box 52 and in the region where the oil ring 54 is arranged. The storage unit 56 stores lubricating oil. The cooling mechanism 58 has a cooling device 70 and a circulation path 72. The cooling device 70 is a cooling tower and cools the cooling medium. Water can be used as the cooling medium. The circulation path 72 connects the flow path of the cooling medium provided below the storage section 56 and the cooling device 70, and is a path through which the cooling medium circulates between the region close to the storage section 56 and the cooling device 70. Become. The cooling mechanism 58 supplies a cooling medium to the lower part of the storage unit 56, exchanges heat between the cooling medium and the lubricating oil stored in the storage unit 56, and transfers the lubricating oil stored in the storage unit 56. Cooling. As a result, the temperature rise of the lubricating oil in the storage portion 56 is suppressed.

In the first bearing device 50, when the spindle 32 rotates, the oil ring 54 rotates together with the spindle 32. By rotating the oil ring 54, the portion of the storage portion 56 in contact with the lubricating oil rotates toward the main shaft 32. As a result, the lubricating oil held by the oil ring 54 is conveyed to the surface of the spindle 32. The lubricating oil conveyed to the spindle 32 moves between the pressure receiving surface 52a and the spindle 32, and becomes an oil film between the pressure receiving surface 52a and the spindle 32. Further, the lubricating oil of the oil film between the pressure receiving surface 52a and the spindle 32 moves due to gravity and the rotation of the spindle 32, and when discharged from between the pressure receiving surface 52a and the spindle 32, it falls into the storage unit 56. The temperature of the lubricating oil that forms the oil film between the pressure receiving surface 52a and the spindle 32 rises due to the rotational force of the spindle 32 and the like. The cooling mechanism 58 cools the lubricating oil in the storage unit 56 to suppress the temperature rise of the lubricating oil in the storage unit 56 and maintain the performance of the lubricating oil.

Next, the control device 100, the output device 101, and the sensor unit 102 will be described. The control device 100 calculates the relationship between the spindle 32 and the pressure receiving surface 52a based on the detection result of the sensor unit 102, and makes a determination based on the calculation result. The configuration of the control device 100 will be described later. The output device 101 is a device that displays the calculation result of the control device 100, the input content from the user, and the like, and is a display or a touch panel in the present embodiment.

The sensor unit 102 is arranged in the area of the bearing box 52 between the oil ring 54 and the pump body 11. The sensor unit 102 includes a first position sensor 104, a second position sensor 106, and four temperature sensors 108, 110, 112, 114.

The first position sensor 104 is fixed to the bearing box 52 and detects the position of the spindle 32 with respect to the bearing box 52. The first position sensor 104 has a detection terminal 104a and a support portion 104b. The detection terminal 104a faces the spindle 32 and detects the distance from the spindle 32. As the detection terminal 104a, various mechanisms for detecting the distance can be used. As the detection terminal 104a, for example, an eddy current type displacement sensor, an ultrasonic displacement sensor, or the like can be used. The support portion 104b is fixed to the bearing box 52, and fixes the detection terminal 104a. The support portion 104b is preferably made of a material that does not fluctuate due to heat. Specifically, it is preferable to use a material having a linear expansion coefficient smaller than that of the bearing box 52, for example, Invariable Steel, for the support portion 104b. The first position sensor 104 is arranged along a line passing through the center 32c of the spindle 32 and the center of the spindle 32 when it is in the reference position (ideal position) during rotation. The position detection sensor 104 detects the position of the spindle 32 on the line passing through the axis 32c.

The second position sensor 106 is fixed to the bearing box 52 and detects the position of the spindle 32 with respect to the bearing box 52. The second position sensor 106 is arranged at the same position as the first position sensor 104 in the axial direction of the spindle 32 and at a different position from the first position sensor 104 in the rotation direction of the spindle 32. The second position sensor 106 has a detection terminal 106a and a support portion 106b. The second position sensor 106 has the same basic configuration as the first position sensor 104, only the arrangement position is different. Since the detection terminal 106a and the support portion 106b have the same configuration as the detection terminal 104a and the support portion 104b, detailed description thereof will be omitted. The first position sensor 106 is arranged along a line passing through the center 32c of the spindle 32 and the center of the spindle 32 when it is in the reference position (ideal position) during rotation. The position detection sensor 104 detects the position of the spindle 32 on the line passing through the axis 32c. In the present embodiment, the second position sensor 106 is arranged at a position 90 degrees different from the first position sensor 104 in the rotation direction.

The four temperature sensors 108, 110, 112, 114 are installed in the bearing box 52 and detect the temperature at the installed position. The four temperature sensors 108, 110, 112, and 114 of the present embodiment are arranged at the same position in the axial direction of the spindle 32. Further, the four temperature sensors 108, 110, 112, and 114 are arranged at 90 degree intervals in the rotation direction of the spindle 32. The four temperature sensors 108, 110, 112, 114 only need to be able to detect the temperature of the bearing box 52, and may detect the temperature of the surface of the bearing box 52 or the internal temperature. In the present embodiment, four temperature sensors 108, 110, 112, and 114 are arranged, but the sensor unit 102 is provided with at least two, that is, a plurality of temperature sensors, as long as the temperature distribution in the circumferential direction of the spindle 32 can be calculated. I just need to be there. The sensor unit 102 can detect the temperature distribution with high accuracy by arranging the temperature sensors at four places.

The control device 100 is a treatment device that acquires information and performs arithmetic processing, and stores an arithmetic unit such as a CPU (Central Processing Unit), arithmetic contents of the arithmetic unit, program information, and the like, for example, a RAM (Random). It has an Access Memory), a ROM (Read Only Memory), and a storage device such as an HDD (Hard Disk Drive). As shown in FIG. 6, the control device 100 includes a position information detection unit 120, a temperature information detection unit 122, a temperature distribution correction value calculation unit 124, a correction processing unit 126, and a determination unit 128.

The position information detection unit 120 receives the signals detected by the first position sensor 104 and the second position sensor 106. The position information detection unit 120 sends the position information received by each position sensor to the correction processing unit 126. The temperature information detection unit 122 receives the signals detected by the four temperature sensors 108, 110, 112, and 114. Converts the received signal into a processable signal. The temperature information detection unit 122 sends the temperature information received by each temperature sensor to the temperature distribution correction value calculation unit 124.

The temperature distribution correction value calculation unit 124 calculates the temperature distribution based on the temperature information received by each temperature sensor, and corrects the position information by using the calculated temperature distribution and the preset correction table. Calculate the value. Here, the correction table is the detection result of each temperature sensor, that is, the state of the temperature distribution and the information on the positional deviation between the first position sensor 104, the second position sensor 106, and the spindle 32 generated in the distribution state. It is a table of correction values set in advance based on. Specifically, in order to estimate the amount of heat elongation of the bearing box 52 from the temperature distribution of the bearing box 52, what happens to the deformation of the installation location of the position sensor when a temperature deviation is given to the measurement position of each temperature. Grasp by thermal deformation analysis. Based on the analysis result, a sensitivity matrix is created between the measurement points of each temperature and the installation location of the position sensor. The temperature distribution correction value calculation unit 124 calculates the correction value based on the sensitivity matrix and the temperature measurement result. The correction method is not limited to this. The temperature distribution correction value calculation unit 124 sends the calculated correction value to the correction processing unit 126.

The correction processing unit 126 corrects each position information with the correction value supplied from the temperature distribution correction value calculation unit 124. That is, the correction processing unit 126 corrects the deviation between the position sensor and the spindle 32 caused by the temperature distribution. The correction processing unit 126 sends the corrected position information to the determination unit 128.

The determination unit 128 detects the position of the axis 32c of the spindle 32 based on the position information supplied from the correction processing unit 126, and determines the position of the axis 32c. Here, the determination unit 128 sets a warning area and a danger area with respect to the position of the axis 32c. In the setting information 130 shown in FIG. 7, a warning area 136 and a danger area 138 are set based on the detected deviation of the axial center position 134 with respect to the reference position 132 of the axial center. The warning area 136 is an area separated from the reference position 132 by the first threshold distance or more. In this embodiment, it is set to a part in the horizontal direction. The danger zone 138 is a region separated from the reference position 132 by a second threshold distance or more.
The second threshold distance is a value larger than the first threshold distance. The danger zone 138 of the present embodiment is covered with the warning zone 136. That is, the warning area 136 is arranged between the reference position 132 and the danger area 138.

The determination unit 128 outputs the determination result to the output device 101. Specifically, when the detected axial center position 134 is in the warning area 136, warning information is output, and when it is in the danger area 138, trip information (instruction to stop the pump 10) is output. When the trip information is output, the output device 101 may only display the information or stop the pump by the control device of the pump 10. When the pump is stopped, the output device 101 includes a device for outputting an instruction in addition to the display device.

The second bearing device 60 rotatably supports the end of the spindle 32 on the motor side 40 side. The second bearing device 60 is a self-lubricating slide bearing, and like the first bearing device 60, the bearing box 62, the oil ring 64, the storage unit (lubricating oil storage unit) 66, the cooling mechanism 68, and the like. Have. Further, although the second bearing device 60 does not include the control device 100, the output device 101, and the sensor unit 102, it may be provided in the same manner as the first bearing device 50.

The pump 10 has the above configuration, and the sensor unit 102 acquires the position information of the axis 32c and the temperature distribution information of the bearing box 52, and based on the temperature distribution, the first position sensor 104 and the second position sensor 104 and the second By correcting the position information of the axis 32c detected by the position sensor 106, it is possible to correct the position shift caused by the influence of heat, specifically, the position shift caused by the thermal elongation of the bearing box 52. The pump 10 can detect the displacement of the axial center with high accuracy by correcting the thermal elongation of the bearing box 52 and detecting the axial center position. As a result, the pump 10 can detect the misalignment of the spindle 32 with high accuracy even when the first bearing device 50 is a self-lubricating slide bearing and the oil film thickness is thin, so that the bearing and the spindle 32 can be detected due to an error during detection. It is possible to prevent the bearing from hitting one side with a high probability. Further, when the spindle 32 is arranged at an appropriate position, it is possible to suppress the output of warning information and the like.

It is preferable that the sensor unit 102 is arranged closer to the pump body 11 than the oil ring 54 to detect the state of the bearing box 52. In particular, by arranging the temperature sensors 108, 110, 112, 114 closer to the pump body 11 than the oil ring 54, the temperature distribution of the bearing box 52 heated by the radiant heat from the pump body 11 can be detected with higher accuracy. Can be done.

Further, in the present embodiment, the number of position sensors is two, but it is preferable to provide three or more position sensors. In this case, the position sensor detects the position of the spindle at three or more locations including two facing locations in the rotation direction of the spindle. The control device 100 can detect the misalignment of the axial center with one of the position sensors at the opposing positions and the non-opposing position sensor. Further, by detecting the position of the spindle 32 at the opposite position, it is possible to detect the expansion of the spindle 32 due to heat (heat elongation of the spindle). By correcting the position in consideration of the thermal elongation of the spindle 32, the position of the axial center can be detected with higher accuracy.

Further, as in the present embodiment, by forming the support portion of the position sensor with a material having a small coefficient of linear expansion, it is possible to suppress the positional deviation in the position sensor, and the detection accuracy can be further improved.

The bearing device of the present embodiment can be used as a bearing device for various types of horizontal pumps that send liquids, that is, a pump body in which the spindles are arranged along the horizontal direction.

10, 10b, 10c pump 12 casing (cabin)
14 Lower casing 16 Upper casing 18 Suction port 19, 21 Flange part 20 Discharge port 22, 24, 26 Air bleeding nozzle 28 Suction chamber 30 Discharge chamber 32 Main shaft (rotor)
34 Impeller 35 Impeller shroud surface 36 Impeller suction port 38 Impeller discharge port 39 Impeller internal flow path 40 Motor side 42 Shaft joint 44 Motor spindle 46 Motor 50 First bearing device 52, 62 Bearing box 54, 64 Oil ring 56, 66 Reservoir (lubricant storage)
58, 68 Cooling mechanism 60 Second bearing device 70 Cooling device 72 Circulation path 100 Control device 101 Output device 102 Sensor unit 104 First position sensor 104a Detection terminal 104b Support part 106 Second position sensor 108, 110, 112, 114 Temperature sensor 120 Position information detection unit 122 Temperature information detection unit 124 Temperature distribution correction value calculation unit 126 Correction processing unit 128 Judgment unit 132 Reference position 134 Detection position 136 Warning area 138 Danger area

Claims (5)

A pump body including a passenger compartment and a rotor arranged inside the passenger compartment and to which an impeller is fixed.
It has a bearing device that rotatably supports the rotor of the pump body, and has
The bearing device includes a storage unit in which lubricating oil is stored and a storage unit.
An oil ring that is hung on the rotor and partly contacts the storage section,
A bearing box in which the storage portion is provided, the oil ring is built in, and a support surface for forming an oil film is formed between the storage portion and the rotor.
A temperature detection unit detected by the bearing box at two or more positions around the rotor of the bearing box,
A position detection unit that detects the position of the rotor with respect to the bearing box, and
A pump including a control device that corrects position information detected by the position detection unit and calculates the position of the rotor based on the detection result of the temperature detection unit. The pump according to claim 1, wherein the temperature detection unit is arranged closer to the pump body side than the oil ring of the bearing box. The control device calculates the axial center position as the position of the rotor,
If it is determined that the axial position is in the warning area, warning information is output.
The first or second aspect of the present invention, wherein the pump main body is stopped when it is determined that the axial center position is in a danger region which is a region having a larger deviation than the warning region. pump. The position according to any one of claims 1 to 3, wherein the position detecting unit is inserted into the bearing box and fixed to the bearing box with a material having a coefficient of linear expansion smaller than that of the bearing box. Pump. The position detection unit according to any one of claims 1 to 4, wherein the position detection unit detects the position of the rotor at three or more places including two facing places in the rotation direction of the rotor. The pump described.

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