Pump equipment and electric motor

Abstract

To provide a pump device capable of easily installing a vibration sensor for detecting abnormality of the pump device without reducing detection accuracy thereof, and an electric motor.SOLUTION: A pump device 1 comprises: a pump 10; an electric motor 11 connected to the pump 10 by a drive shaft 21; an inverter case 32 fixed along an axial direction of the drive shaft 21 to the end part of the electric motor 11 on the opposite load side; an inverter board 31 that is fixed in the inverter case 32, and performs variable speed control of the electric motor 11; and a vibration sensor 37 mounted on the inverter board 31.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a pump device and an electric motor used in the pump device. [Background technology]

[0002] Water supply systems including pump devices are known as devices that are installed in buildings such as apartment buildings and office buildings and supply water to each water supply terminal. The pump devices used in such water supply systems generally use electric motors as their power source. In addition, some electric motors used in such pump devices are equipped with inverters to vary the rotation speed.

[0003] In addition, various operational abnormalities may occur in pump devices during use. For this reason, some pump devices are provided with a vibration sensor (acceleration pickup) at a predetermined position on the outside of the pump device to detect such operational abnormalities (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2007-010415 A Summary of the Invention [Problem to be solved by the invention]

[0005] It is possible to detect vibrations caused by operational abnormalities of a pump device by using a vibration sensor such as that described in Patent Document 1. However, when a vibration sensor is attached to the outside of a pump device as in Patent Document 1, the detectable vibration value changes depending on how the sensor is attached, making it difficult to accurately and stably detect vibrations caused by operational abnormalities.

[0006] In view of the above-mentioned problems, the present invention has an object to provide a pump device and an electric motor in which a vibration sensor for detecting abnormalities in the pump device can be easily installed with accurate and stable detection precision. [Means for solving the problem]

[0007] In order to achieve the above object, a pump device 1 according to a first aspect of the present invention, as shown in Figures 1 to 3, for example, includes a pump 10; an electric motor 11 connected to the pump 10 by a drive shaft 21; an inverter case 32 fixed to the anti-load end of the electric motor 11 along the axial direction of the drive shaft 21; an inverter board 31 fixed within the inverter case 32 for performing variable speed control of the electric motor 11; and a vibration sensor 37 mounted on the inverter board 31.

[0008] With this configuration, the vibration sensor 37 that detects vibrations occurring in the pump device 1 is mounted on the inverter board 31, so it is possible to accurately and stably detect vibrations occurring in the pump device 1. Furthermore, no separate installation work or the like is required for the pump device 1 in order to install the vibration sensor 37, and no separate wiring for the vibration sensor 37 is required.

[0009] As shown in FIG. 3, the pump device 1 according to the second aspect of the present invention is the pump device 1 according to the first aspect of the present invention, in which the inverter board 31 is fixed to the inner surface of the inverter case 32 using a plurality of screws 40, and the vibration sensor 37 is mounted at a position adjacent to one of the plurality of screws 40.

[0010] With this configuration, the vibration sensor 37 can be positioned adjacent to the fixed position relative to the inverter case 32, so that the vibration sensor 37 will not detect vibrations other than those transmitted to the motor 11 caused by the influence of components mounted on the inverter board 31, thereby improving detection accuracy.

[0011] The pump device 1 according to the third aspect of the present invention is the pump device 1 according to the first aspect of the present invention, wherein one or more power modules 41 are mounted on the inverter board 31, and the vibration sensor 37 is mounted at a position adjacent to where the one or more power modules 41 are solder-connected to the inverter board 31.

[0012] With this configuration, the vibration sensor 37 is positioned adjacent to the power module 41 which is firmly soldered to the inverter board 31, so that it does not detect vibrations that occur in the inverter board 31 and are different from the vibrations transmitted to the motor 11, thereby improving detection accuracy.

[0013] As shown in FIG. 4, a pump device 1 according to a fourth aspect of the present invention is the pump device 1 according to any one of the first to third aspects of the present invention, in which the inverter board 31 in the inverter case 32 is fixed by a resin 42 filled in at least a portion of the inverter case 32.

[0014] With this configuration, the inverter board 31 is fixed to the inverter case 32 by the resin 42, so that the inverter board 31 does not vibrate independently, and the detection accuracy of the vibration sensor 37 is improved.

[0015] A pump device 1 according to a fifth aspect of the present invention, as shown in, for example, Figures 2 and 3, in the pump device 1 according to the first to fourth aspects of the present invention, is configured such that the inverter board 31 is fixed within the inverter case 32 perpendicular to the drive shaft 21 connected to the pump 10 of the electric motor 11.

[0016] With this configuration, the detection accuracy of the vibration sensor 37 is particularly improved for vibrations perpendicular to the drive shaft 21, which frequently occur in the pump device 1.

[0017] A pump device 1 according to a sixth aspect of the present invention, as shown in FIG. 5, in the pump device 1 according to the first to fifth aspects of the present invention, further includes a monitoring device 50 that monitors the state of the pump device 1 based on the output value of the vibration sensor 37, and the monitoring device 50 includes a memory unit 53 that stores motor information about the electric motor 11 and pump information about the pump 10, and monitors the state of the pump device 1 based on the information stored in the memory unit 53 and the output value of the vibration sensor 37.

[0018] With this configuration, the monitoring device 50 can determine with high accuracy whether or not an abnormality or a symptom of an abnormality has occurred in the pump device 1.

[0019] A pump device 1 according to a seventh aspect of the present invention, as shown in FIG. 5, is the pump device 1 according to the sixth aspect of the present invention, wherein the monitoring device 50 further includes a driving status acquisition unit 55 for acquiring the driving status of the electric motor 11 by the inverter board 31, and monitors the status of the pump device 1 based on the information stored in the memory unit 53, the output value of the vibration sensor 37, and the driving status information of the electric motor 11 acquired by the driving status acquisition unit 55.

[0020] With this configuration, detection by the vibration sensor 37 and monitoring of the pump device 1 can be performed while taking into consideration the driving state, thereby enabling monitoring of the pump device 1 based on the signal detected with high accuracy by the vibration sensor 37.

[0021] As shown in FIG. 5, for example, in the pump device 1 according to the eighth aspect of the present invention, in the pump device 1 according to the seventh aspect of the present invention, the monitoring device 50 monitors the state of the pump device 1 when the driving state of the electric motor 11 acquired by the driving state acquisition unit 55 is in a steady state.

[0022] With this configuration, by monitoring the state of the pump device 1 when it is in a steady state, the output value of the vibration sensor 37 used for the monitoring does not include transient vibrations that may occur when the pump device 1 accelerates or decelerates. Therefore, the pump device 1 can be monitored with higher accuracy.

[0023] As shown in FIG. 5, the pump device 1 according to a ninth aspect of the present invention is similar to the pump device 1 according to the sixth to eighth aspects of the present invention, except that the monitoring device 50 is provided on the inverter board 31.

[0024] With this configuration, by providing the monitoring device 50 on the inverter board 31, the monitoring function of the pump device 1 can be substantially completed by the circuit configuration on the inverter board 31 alone.

[0025] An electric motor 11 according to a tenth aspect of the present invention is an electric motor 11 for driving a pump 10, as shown in, for example, Figure 2 or Figure 3, and includes: a drive shaft 21 connected to a rotating shaft of the pump 10; an electric motor body 22 for driving the drive shaft 21; an inverter case 32 fixed to the anti-load side end of the electric motor body 22 along the axial direction of the drive shaft 21; an inverter board 31 fixed within the inverter case 32 for performing variable speed control of the electric motor body 22; and a vibration sensor 37 mounted on the inverter board 31.

[0026] With this configuration, the vibration sensor 37 that detects vibrations occurring in the pump 10 or the electric motor 11 is mounted on the inverter board 31, so it becomes possible to accurately and stably detect vibrations occurring in the pump 10 or the electric motor 11. Furthermore, no special processing or the like is required to install the vibration sensor 37, and there is no need to prepare separate wiring for the vibration sensor 37. Effect of the Invention

[0027] With the above-described configuration, the pump device and electric motor of the present invention enable a vibration sensor for detecting an abnormality in the pump device to be easily installed with accurate and stable detection precision. [Brief description of the drawings]

[0028] [Figure 1] 1 is a schematic diagram showing a pump device according to an embodiment of the present invention; [Diagram 2] 1 is an exploded perspective view of an electric motor according to an embodiment of the present invention; [Diagram 3] 1 is a schematic cross-sectional view showing an electric motor according to an embodiment of the present invention; [Figure 4] 4 is another schematic cross-sectional view showing the electric motor according to the embodiment of the present invention. FIG. [Diagram 5] 1 is a partial functional block diagram of a pump device according to an embodiment of the present invention; [Figure 6] FIG. 4 is a diagram showing an example of a frequency analysis result of the vibration sensor according to the embodiment of the present invention. [Figure 7] 11A and 11B are diagrams illustrating another example of a frequency analysis result of the vibration sensor according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] Hereinafter, each embodiment for carrying out the present invention will be described with reference to the drawings. Note that, in the following, the scope necessary for the explanation to achieve the object of the present invention is shown in a schematic manner, and the scope necessary for the explanation of the relevant part of the present invention will be mainly explained, and the parts that are omitted from the explanation will be referred to as publicly known techniques.

[0030] Fig. 1 is a schematic diagram showing a pump device 1 according to an embodiment of the present invention. As shown in Fig. 1, the pump device 1 according to the present embodiment includes a pump 10 and an inverter-equipped electric motor 11. The pump device 1 can be used as a part of a water supply system for supplying water to a building or the like.

[0031] As shown in Fig. 1, the pump 10 may be, for example, a well-known horizontal shaft single stage pump for supplying water to buildings and the like. The pump 10 has a rotating shaft for rotating an internal impeller, and the rotating shaft is connected to a drive shaft 21 (described later) of an electric motor 11 via a coupling 12. In this embodiment, a horizontal shaft single stage pump is illustrated as an example of the type of pump, but the type is not limited to this, and a vertical shaft multistage pump, a submersible pump, or the like may also be adopted. In addition, the pump device 1 shown in Fig. 1 connects the pump 10 and the electric motor 11 via a coupling 12, but the pump device may also be configured such that the drive shaft 21 of the electric motor 11 and the rotating shaft of the pump 10 are formed as a single shaft in common.

[0032] Fig. 2 is an exploded perspective view of an electric motor according to an embodiment of the present invention. Fig. 3 is a schematic cross-sectional view showing an electric motor according to an embodiment of the present invention. As shown in Figs. 2 and 3, electric motor 11 according to this embodiment is an inverter-integrated motor, and includes a drive shaft 21, an electric motor body 22 that drives the drive shaft 21, and an inverter unit 23 provided at an end of the electric motor body 22 on the anti-load side. In electric motor 11 according to this embodiment, the side on which pump 1 is provided is called the load side, and the side opposite to the load side is called the anti-load side.

[0033] The drive shaft 21 extends so as to penetrate through the center of the electric motor body 22 and the inverter unit 23, and its load side end is connected to the rotating shaft of the pump 10 via a coupling 12. A cooling fan 24 for cooling the electric motor 11 is attached to the anti-load side end of the drive shaft 21. A part of the cooling fan 24 is covered by a fan cover 25 fixed to the inverter unit 23.

[0034] The electric motor body 22 mainly includes a rotor 26 fixed to the drive shaft 21, a stator 27 arranged around the rotor 26, and a motor case 28 that houses the rotor 26 and the stator 27. The drive shaft 21 is rotatably supported relative to the motor case 28 by two bearings 29, 30 fixed to the motor case 28.

[0035] The inverter section 23 mainly includes an inverter board 31 and an inverter case 32 that houses the inverter board 31. The inverter case 32 is composed of a substantially disk-shaped inverter heat sink 32A and a substantially cylindrical inverter cover 32B that is fixed so as to stand on the load side from the outer edge of the inverter heat sink 32A. The inverter cover 32B fixed to the inverter heat sink 32A has its load side end face integrally fixed to the end face of the motor case 28 on the opposite load side, and a cylindrical wall 33 that communicates the end of the drive shaft 21 on the opposite load side is attached to the center of the inverter heat sink 32A. The above-mentioned cooling fan 24 is disposed on the opposite load side of the inverter heat sink 32A, and the fan cover 25 is fixed thereto. Furthermore, in order to efficiently cool the electric motor 11 by the cooling fan 24, in addition to the surface of the inverter heat sink 32A, fins 34 are provided at various locations on the surfaces of the inverter cover 32B and the motor case 28, and as a result, the inverter case 32 and the motor case 28 function as a heat sink as a whole. Although FIG. 2 illustrates a structure in which the inverter cover 32B and the inverter heat sink 32A are separate, the inverter cover 32B and the inverter heat sink 32A may be integrated into one body.

[0036] The inverter board 31 is a circuit board on which various electronic components are mounted and on which an electric circuit is formed, and serves to perform variable speed control of the electric motor 11. Examples of electronic components mounted on the inverter board 31 include one or more capacitors 35, one or more transformers 36, and a vibration sensor 37 (described later). In FIG. 3, components other than the exemplified electronic components are collectively shown as electronic components 38, and detailed shapes and the like are not shown.

[0037] Further, the inverter board 31 has screw holes 39 at appropriate positions. Then, screws 40 are inserted into the screw holes 39 and screwed into the inverter heat sink 32A, thereby fixing the inverter board 31 to the inverter heat sink 32A. The inverter board 31 of this embodiment is fixed to the inner wall surface of the inverter heat sink 32A, as shown in Fig. 3. And, in this embodiment, a power module 41 for controlling the supply of power to the inverter board 31 is disposed in the space between the inverter board 31 and the inverter heat sink 32A.

[0038] However, in the pump device 1 having such a configuration, it is known that when an abnormality occurs, vibrations different from normal ones occur. Examples of abnormalities that occur in a pump device used in a water supply device such as the pump device 1 according to this embodiment include cavitation, or failure of the bearings of the pump or the electric motor. In the pump device 1 of this embodiment, for example, if one of the bearings 29 of the electric motor 11 fails, the drive shaft 21 cannot rotate stably due to the failure of the bearing 29, and as a result, large vibrations are transmitted to the motor case 28 and the inverter case 32 fixed to the motor case 28. Similarly, in the pump 10 of the pump device 1 of this embodiment, for example, if cavitation occurs, the vibrations generated by the cavitation are first transmitted to the impeller or casing of the pump 10, and then transmitted to the rotating shaft of the pump 10, the coupling 12, and the drive shaft 21, and the vibrations are transmitted to the entire electric motor 11 including the motor case 28 and the inverter case 32 fixed to the motor case 28.

[0039] The inventors have focused on the transmission path of vibration caused by such abnormalities and arrived at the present invention. That is, in any of the illustrated abnormalities, the vibration caused by the abnormality is transmitted to the electric motor 11, and therefore, if the vibration transmitted to the electric motor 11 can be accurately detected, the abnormality occurring in the pump device 1 can be accurately detected, and thus the present invention has been arrived at. Specifically, a configuration is adopted in which a vibration sensor 37 is mounted on the inverter board 31 of the electric motor 11 according to this embodiment.

[0040] The vibration sensor 37 mounted on the inverter board 31 is for detecting vibrations caused by abnormalities occurring in the pump device 1, and a sensor capable of detecting three-dimensional vibrations can be adopted. As a vibration sensor for detecting each vibration in three-dimensional directions, for example, a well-known three-axis acceleration sensor can be adopted. Vibrations caused by abnormalities occurring in the pump 10 (e.g., occurrence of cavitation or failure of bearings of the pump 10) transmitted to the electric motor 11 via the coupling 12, or vibrations caused by abnormalities occurring in the electric motor 11 itself (e.g., failure of bearings 29, 30) are transmitted in the order of the motor case 28 of the electric motor 11, the inverter cover 32B or cylindrical wall 33 fixed to the motor case 28, the inverter heat sink 32A, and the inverter board 31 fixed to the inverter heat sink 32A with screws 40, and are detected by the vibration sensor 37 mounted on the inverter board 31. The presence or absence of an abnormality in the pump device 1 is determined or estimated by taking into consideration the vibrations detected here.

[0041] Here, it is important to note that the vibration sensor 37 of the present invention is positioned adjacent to the screw 40 and / or the power module 41. When the vibration sensor 37 is positioned in such a position, the screw 40 is fixed to the inverter case 32, and the power module 41 (IGBT, power MOSFET, etc.) is generally a member that is screwed to the heat sink 32A and firmly soldered to the board. Therefore, when the vibration sensor 37 detects the vibration transmitted to the inverter board 31, the vibration of the inverter board 31 itself caused by the capacitor 35 mounted on the inverter board 31 is unlikely to be mixed into the detection result. Note that "adjacent" here refers to being disposed in a position close to the vibration sensor 37 and the screw 40 or the power module 41 without any other electronic components being interposed between them. Therefore, in this embodiment, the vibration sensor 37 is disposed adjacent only to the screw 40 as shown in FIG. 2 and FIG. 3. However, the present invention is not limited to this, and the vibration sensor 37 may be disposed adjacent to the power module 41, or adjacent to both the screw 40 and the power module 41.

[0042] FIG. 4 is another schematic cross-sectional view showing an electric motor according to an embodiment of the present invention. As described above, it is important to ensure the accuracy of the detection result that other vibrations, specifically, the above-mentioned vibrations of the inverter board 31 itself are not mixed into the detection result of the vibration sensor 37. Therefore, as another method for preventing other vibrations that may become noise from being mixed into the detection result of the vibration sensor 37, as shown in FIG. 4, a resin (molding resin) 42 may be filled in a part of the anti-load side in the inverter case 32, and the inverter board 31 may be molded and fixed to the inverter case 32. By resin-molding the entire inverter board 31 in this way, it is possible to prevent the inverter board 31 from vibrating by itself. In this case, in addition to suppressing the above-mentioned noise from being mixed in, the mounting position of the vibration sensor 37 is not restricted, so that the degree of freedom in the layout of the inverter board 31 is improved.

[0043] Furthermore, as shown in this embodiment, fixing the inverter board 31 to the inverter case 32 so as to be perpendicular to the drive shaft 21 is preferable from the viewpoint of maintaining the detection accuracy of the vibration sensor 37 mounted on the inverter board 31. Vibrations occurring in the pump device 1 generally tend to occur in the rotational direction of the drive shaft 21 (direction perpendicular to the drive shaft 21) rather than in the extension direction of the drive shaft 21. On the other hand, vibrations caused by deflection occurring in the inverter board 31 tend to occur easily in the extension direction (axial direction) of the drive shaft 21. Therefore, according to the fixing method of the inverter board 31 of the present invention, the influence of the vibration of the inverter board 31 itself on the vibration component in the rotational direction of the drive shaft 21 is reduced, and vibrations occurring in the pump device 1 can be detected with high accuracy.

[0044] As described above, in the pump device 1 and electric motor 11 according to this embodiment, the vibration sensor 37 for detecting abnormalities in the pump device 1 is mounted on the inverter board 31, which eliminates the need to mount the vibration sensor 37 on each pump device 1, and makes it possible to stably and accurately detect vibrations occurring in the pump device 1. Furthermore, by mounting the vibration sensor 37 on the inverter board 31, it becomes unnecessary to provide a dedicated signal line that was required when the vibration sensor 37 was mounted on the outer wall of the pump 10 or electric motor 11, or on each bearing portion, for example, and it becomes possible to detect vibrations in the pump device 1 with a simple configuration.

[0045] According to the above-mentioned configuration, the vibration sensor 37 can accurately detect vibrations occurring in the pump device 1, but depending on the specific method of using the detection results, it is not possible to accurately detect abnormalities in the pump device 1. In particular, when attempting to detect signs of abnormalities in addition to cases where an abnormality has actually occurred, the method of using the detection results is particularly important. Therefore, another object of the present invention is to provide a pump device and an electric motor that can use the detection results detected by the vibration sensor 37 to monitor for the presence or absence of abnormalities or signs of abnormalities (hereinafter, these will be collectively referred to simply as "abnormalities"). The configuration for achieving this other object will be described below.

[0046] 5 is a partial functional block diagram of a pump device according to an embodiment of the present invention. In the pump device 1 according to this embodiment, the inverter board 31 further includes a monitoring device 50 in addition to the vibration sensor 37 described above.

[0047] The monitoring device 50 is a device for monitoring whether or not there is an abnormality in the pump device 1. This monitoring device 50 includes at least a detection result acquisition unit 51, a calculation unit 52, a storage unit 53, and an interface 54. These components are capable of communicating with each other via an internal bus in the monitoring device 50.

[0048] The detection result acquisition unit 51 is connected to the vibration sensor 37, acquires the detection result of the vibration sensor 37, and transfers the detection result data to the calculation unit 52 or the storage unit 53, which will be described later.

[0049] The calculation unit 52 is mainly composed of an arithmetic device such as a microcomputer, and performs frequency analysis on the detection result data acquired by the detection result acquisition unit 51. Furthermore, the calculation unit 52 may determine whether or not there is an abnormality in the pump device 1 based on the result of the frequency analysis as necessary. Well-known methods can be adopted as the frequency analysis method. For example, by observing the distribution of frequencies contained in the result of performing a fast Fourier transform (FFT) on the raw data of the detection result, it is possible to identify the cause of vibration, and determine the presence or absence of an abnormality.

[0050] The storage unit 53 is configured with a well-known storage medium such as a volatile or non-volatile memory, and is capable of storing programs for operating the calculation unit 52 and various information necessary for calculations in the calculation unit 52. The storage unit 53 also stores motor information related to the electric motor 11 (e.g., the number of poles, the number of bearing balls, the number of blades of the cooling fan 24, etc.) and pump information related to the pump 10 (e.g., the number of impeller blades, the number of bearing balls, etc.). This information is used by the calculation unit 52 when determining whether the pump device 1 is abnormal.

[0051] The interface 54 is for inputting and outputting information to and from the monitoring device 50. Various configurations can be adopted for this interface 54, but in this embodiment, an interface that at least includes a communication means using short-range wireless communication represented by infrared communication, Bluetooth (registered trademark), and NFC and realizes two-way communication with an external device, for example, a mobile communication terminal 13 such as a smartphone, a tablet terminal, or a mobile PC, is adopted. This makes it possible to transmit, for example, a frequency analysis result calculated by the calculation unit 52 or a determination result of the presence or absence of an abnormality to the mobile communication terminal 13, or to receive various requests from the mobile communication terminal 13. Note that the interface 54 is not limited to the above-mentioned configuration, and can also be a combination of an input interface such as a keyboard or a pointing device and an output interface such as a monitor or a speaker. In addition, the external device is not limited to the above-mentioned mobile communication terminal 13, and may be, for example, a management server connected to a network line.

[0052] In addition to the above-mentioned configuration, the monitoring device 50 according to this embodiment further includes a driving state acquisition unit 55 for acquiring the driving state of the electric motor 11. As shown in Fig. 5, this driving state acquisition unit 55 acquires a control signal of the inverter device 31A including the inverter circuit formed on the inverter board 31 and the capacitor 35 mounted on the inverter board 31, thereby identifying the driving state including the operating frequency of the electric motor 11. Then, when performing frequency analysis in the calculation unit 52, the monitoring device 50 can perform frequency analysis based on the operating frequency of the electric motor 11 by using the driving state information of the electric motor 11 acquired by this driving state acquisition unit 55, thereby achieving high analysis accuracy.

[0053] With the above-mentioned configuration, the monitoring device 50 can monitor the pump device 1. To explain an example of a specific monitoring method by the monitoring device 50, first, the detection results of the vibration sensor 37 when no abnormality occurs in the pump device 1 are obtained in advance multiple times. Then, in the calculation unit 52, a frequency analysis is performed based on the detection results and the motor information and pump information stored in the storage unit 52, and the analysis results at various timings when no abnormality occurs in the pump device 1 are learned and stored (for example, using a well-known machine learning method). Then, the pump device 1 is operated normally, the detection results of the vibration sensor 37 are sequentially obtained, and the calculation unit 52 similarly performs a frequency analysis. Then, the result of the frequency analysis is compared with the analysis results when no abnormality occurs in the pump device 1 that have been stored in advance, and the presence or absence of an abnormality is identified by identifying the change.

[0054] FIG. 6 is a diagram showing an example of a frequency analysis result of the vibration sensor according to an embodiment of the present invention. In FIG. 6, the graph of the analysis result indicated by reference symbol D1 is an analysis result at an arbitrary timing when no abnormality occurs in the pump device 1, which is stored in advance in the storage unit 53, and the graph of the analysis result indicated by reference symbol D2 is an analysis result at the same timing when an abnormality occurs in the pump device 1. In the example of FIG. 6, it can be seen that the distribution of vibration (amplitude) levels at each frequency in the graphs of both analysis results D1 and D2 is relatively shifted in the horizontal direction. In the calculation unit 52, by identifying such a change in the analysis result, it is possible to identify that an abnormality has occurred in the pump device 1.

[0055] FIG. 7 is a diagram showing another example of the frequency analysis result of the vibration sensor according to the embodiment of the present invention. In FIG. 7, the graph of the analysis result indicated by the reference symbol D3 is the analysis result at an arbitrary timing (different from the timing shown in FIG. 6) when no abnormality occurs in the pump device 1, which is stored in advance in the storage unit 53, and the graph of the analysis result indicated by the reference symbol D4 is the analysis result at the same timing when an abnormality occurs in the pump device 1. In the example of FIG. 7, it can be seen that the vibration level is greater in the analysis result D4 than in the analysis result D3 at a specific frequency. The calculation unit 52 can specify that an abnormality has occurred in the pump device 1 by specifying such a change in the analysis result. Then, the specified result in the calculation unit 52 or the analysis result shown in FIG. 6 or FIG. 7 is transmitted to the mobile communication terminal 13 using the interface 54, so that the occurrence of the abnormality can be notified to the user or the like who manages the pump device 1.

[0056] The method of identifying an abnormality based on the detection result of the vibration sensor 37 is not limited to the above-mentioned method. For example, it is also possible to identify that an abnormality has occurred when the level of vibration detected by the vibration sensor 37 is greater than or equal to a threshold value previously set based on pump information, motor information, and the like. The vibration level may be an overall value (OA value) resulting from frequency analysis of measured vibration data, or a vibration level of a previously set frequency. In addition to identifying an abnormality using the above-mentioned method, the location where the abnormality has occurred can be identified or estimated by taking into consideration the frequency analysis result of the vibration sensor, the operating frequency of the inverter, pump information and motor information stored in the memory unit 53, and the like.

[0057] Incidentally, the vibration sensor 37 according to this embodiment can detect vibrations occurring in the pump device 1 with high accuracy as described above, but the detection result is not always suitable for monitoring an abnormality. In detail, when the motor 11 accelerates or decelerates, a transient vibration is likely to occur in the pump device 1, and the rotation frequency of the motor 11 fluctuates during acceleration and deceleration, so the detection result of the vibration sensor 37 at this time is not very suitable as data for determining whether an abnormality has occurred. Therefore, the monitoring device 50 according to this embodiment further specifies whether the motor 11 is in an accelerating / decelerating state or a steady state from the driving state acquired by the driving state acquisition unit 55, and performs vibration detection by the vibration sensor 37 only when the motor 11 is in the steady state. By controlling the vibration detection timing in this manner, the monitoring device 50 can always achieve highly accurate monitoring of an abnormality.

[0058] Furthermore, when the monitoring device 50 is provided on the inverter board 31 as in this embodiment, it becomes possible to realize the entire series of monitoring processes on the inverter board 31, and it is possible to provide an electric motor that realizes an abnormality monitoring function on its own. In particular, the inverter board 31 is particularly advantageous in that it can easily realize control such as detecting an abnormality only when the electric motor 11 is in a specific driving state, which was difficult to achieve when a means for detecting an abnormality was prepared separately from the pump device 1, by providing the monitoring device 50 on the inverter board 31. However, the monitoring device 50 does not necessarily have to be provided on the inverter board 31, and may be disposed at a predetermined position in the inverter case 32, or the main function of the monitoring device 50 may be mounted on the mobile communication terminal 13, and the inverter board 31 may be provided with only a communication function for transmitting the detection result of the vibration sensor 37, the driving state of the electric motor 11, etc.

[0059] As described above, by employing the above-described monitoring device 50 for the electric motor 11 of the pump device 1, it is possible to realize monitoring of abnormalities in the pump device 1 using the detection results of the vibration sensor 37.

[0060] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit and scope of the present invention, all of which are included in the technical concept of the present invention. [Explanation of symbols]

[0061] 1 Pumping equipment 10. Pump 11. Inverter-equipped motor 12 Coupling 13 Mobile communication devices 21 Drive shaft 22 Motor body 23 Inverter section 24 Cooling fan 25 Fan cover 26 Rotor 27 Stator 28 Motor case 29, 30 Bearings 31 Inverter board 31A inverter device 32 Inverter case 32A Inverter Heatsink 32B Inverter cover 33 Cylindrical Wall 34 Finn 35 Capacitor 36 Power transformer 37 Vibration Sensor 38 Electronic Components 39 Screw holes 40 Screws 41 Power Module 42 Resin 50 Monitoring equipment 51 Detection result acquisition unit 52 Calculation section 53 Storage section 54 Interface 55 Drive status acquisition unit

Claims

1. A pump; an electric motor connected to the pump by a drive shaft; an inverter case fixed to an end of the motor on the opposite side to the load side along the axial direction of the drive shaft; an inverter board for performing variable speed control of the motor, the inverter board being fixed in the inverter case such that one surface of the inverter board faces an end of the motor on the opposite load side; a vibration sensor mounted on a surface of the inverter board facing an end portion of the motor on the opposite load side, the vibration sensor detecting vibrations generated in at least one of the pump and the motor; the inverter board is fixed to the inner surface of the inverter case by a plurality of screws, and the vibration sensor is mounted at a position adjacent to any one of the plurality of screws. Pump equipment.

2. A pump; an electric motor connected to the pump by a drive shaft; an inverter case fixed to an end of the motor on the opposite side to the load side along the axial direction of the drive shaft; an inverter board for performing variable speed control of the motor, the inverter board being fixed in the inverter case such that one surface of the inverter board faces an end of the motor on the opposite load side; a vibration sensor mounted on a surface of the inverter board facing an end portion of the motor on the opposite load side, the vibration sensor detecting vibrations generated in at least one of the pump and the motor; one or more power modules are mounted on the inverter board, and the vibration sensor is mounted at a position adjacent to the one or more power modules. Pump equipment.

3. The inverter board in the inverter case is fixed by a resin that fills at least a part of the inverter case. The pump device according to claim 1 or 2.

4. The inverter board is fixed in the inverter case perpendicular to the drive shaft connected to the pump of the electric motor. A pump device according to any one of claims 1 to 3.

5. a monitoring device that monitors a state of the pump device based on an output value of the vibration sensor, The monitoring device includes a storage unit that stores motor information related to the motor and pump information related to the pump, and monitors a state of the pump device based on each piece of information stored in the storage unit and an output value of the vibration sensor. A pump device according to any one of claims 1 to 4.

6. The monitoring device further includes a drive status acquisition unit that acquires a drive status of the electric motor by the inverter board, and monitors a state of the pump device based on each piece of information stored in the storage unit, an output value of the vibration sensor, and drive status information of the electric motor acquired by the drive status acquisition unit.

6. The pump device according to claim 5.

7. the monitoring device monitors the state of the pump device when the drive state of the electric motor acquired by the drive state acquisition unit is in a steady state.

7. The pump device according to claim 6.

8. The monitoring device is provided on the inverter board. A pump device according to any one of claims 5 to 7.

9. An electric motor for driving a pump, A drive shaft connected to a rotating shaft of the pump; An electric motor body that drives the drive shaft; an inverter case fixed to an end of the motor body on the opposite load side along the axial direction of the drive shaft; an inverter board for performing variable speed control of the motor body, the inverter board being fixed in the inverter case such that one surface of the inverter board faces an end portion of the motor body on the opposite load side; a vibration sensor mounted on a surface of the inverter board facing an end portion of the motor body on the opposite load side, the vibration sensor detecting vibrations generated in at least one of the pump and the motor; the inverter board is fixed to the inner surface of the inverter case by a plurality of screws, and the vibration sensor is mounted at a position adjacent to any one of the plurality of screws. Electric motor.

10. An electric motor for driving a pump, A drive shaft connected to a rotating shaft of the pump; An electric motor body that drives the drive shaft; an inverter case fixed to an end of the motor body on the opposite load side along the axial direction of the drive shaft; an inverter board for performing variable speed control of the motor body, the inverter board being fixed in the inverter case such that one surface of the inverter board faces an end portion of the motor body on the opposite load side; a vibration sensor mounted on a surface of the inverter board facing an end portion of the motor body on the opposite load side, the vibration sensor detecting vibrations generated in at least one of the pump and the motor; one or more power modules are mounted on the inverter board, and the vibration sensor is mounted at a position adjacent to the one or more power modules. Electric motor.

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