Power system monitoring device and method

Abstract

The invention discloses a power system monitoring device and method, and belongs to the technical field of engineering machinery, a power system comprises a gearbox, the gearbox comprises a box body, a bearing and a transmission shaft, the box body is provided with a bearing cavity, the bearing is arranged in the bearing cavity, the transmission shaft is in transmission connection with the bearing, and the power system monitoring device comprises a power generation assembly and a monitoring assembly. The power generation assembly comprises a thermoelectric power generation piece, the hot end of the thermoelectric power generation piece faces the bearing cavity, the cold end of the thermoelectric power generation piece is away from the bearing cavity, and lubricating oil in the bearing cavity can wash the hot end of the thermoelectric power generation piece so that the thermoelectric power generation piece can generate electric energy. The assembly comprises a circuit board and a plurality of sensors, the sensors are electrically connected with the circuit board, the power generation assembly provides electric energy for the circuit board, and the sensors comprise a vibration sensor, a temperature sensor and a torque sensor. The power system monitoring device is adopted in the power system monitoring method. And heat is fully utilized, monitoring can be carried out, the fault rate is reduced, and energy is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering machinery, and in particular to a power system monitoring device and method. Background Art

[0002] Motors and gearboxes are usually used to provide power in construction machinery. Gearboxes may fail during operation. Due to the internal sealing of the gearbox, it is difficult to detect internal faults in a timely manner during daily inspections. Frequent removal of the gearbox observation hole cover or plug is time-consuming and laborious, which will affect its sealing, causing oil leakage or gearbox oil pollution. Sensors are usually used to monitor the status of the gearbox, and batteries are used to power the sensors. Battery replacement is difficult, which leads to high fault monitoring costs.

[0003] In addition, the gearbox lubrication method is mostly oil immersion lubrication, that is, the lubricating oil is brought to the meshing part by the rotation of gears or other auxiliary parts, and some of the lubricating oil can lubricate the bearings. The bearings will generate heat during use, and the lubricating oil will take away the heat generated by the bearings to cool them down. The bearings are cooled by the lubricating oil, and the heat cannot be fully utilized. Summary of the invention

[0004] The object of the present invention is to provide a power system monitoring device and method to solve the technical problems existing in the prior art that gearbox fault monitoring is difficult and the heat generated at the bearing cannot be fully utilized.

[0005] As conceived above, the technical solution adopted by the present invention is:

[0006] A power system monitoring device, the power system includes a gear box, the gear box includes a housing, a bearing and a transmission shaft, the housing is provided with a bearing cavity, the bearing is arranged in the bearing cavity, the transmission shaft is connected to the bearing in a transmission manner, and the power system monitoring device includes:

[0007] A power generation component is arranged in the housing, the power generation component includes a thermoelectric power generation sheet, the hot end of the thermoelectric power generation sheet faces the bearing cavity, the cold end of the thermoelectric power generation sheet is away from the bearing cavity, and the lubricating oil in the bearing cavity can flush the hot end of the thermoelectric power generation sheet so that the thermoelectric power generation sheet generates electricity; or, the hot end of the thermoelectric power generation sheet faces the transmission shaft, the cold end of the thermoelectric power generation sheet is away from the transmission shaft, heat is transferred to the hot end of the thermoelectric power generation sheet through the transmission shaft, and the cold end of the thermoelectric power generation sheet dissipates heat through lubricating oil or air;

[0008] The monitoring component comprises a circuit board and a plurality of sensors, wherein the sensors are electrically connected to the circuit board, the power generation component provides electrical energy to the circuit board, and the plurality of sensors comprise a vibration sensor, a temperature sensor and a torque sensor.

[0009] Preferably, the temperature difference power generation sheet is fixedly connected to the transmission shaft and is arranged in a ring shape around the circumference of the transmission shaft, and the circuit board is arranged on the transmission shaft.

[0010] Preferably, a heat collecting plate is provided at the hot end of the thermoelectric power generation sheet, and the heat collecting plate is located in the bearing cavity; and / or a heat sink is provided at the cold end of the thermoelectric power generation sheet, and the heat sink extends away from the bearing cavity.

[0011] Preferably, the power generation component further comprises a plurality of piezoelectric power generation sheets, and the piezoelectric power generation sheets are fixedly disposed on the transmission shaft and generate electric energy under the vibration of the transmission shaft.

[0012] Preferably, the power generation component also includes a coil and a magnet, one of the coil and the magnet is arranged on the transmission shaft, and the other is arranged on the box, during the rotation of the transmission shaft, the coil and the magnet have relative movement to generate electrical energy, and the coil is electrically connected to the circuit board.

[0013] Preferably, the coil is fixedly connected to the transmission shaft, the circuit board is arranged on the transmission shaft, and the magnet is fixedly connected to the box.

[0014] Preferably, the power system further comprises a motor, which is arranged outside the casing and can drive the transmission shaft to rotate, and the coil cuts the electromagnetic waves emitted by the motor to the surrounding space to generate electrical energy during the process of synchronous rotation with the transmission shaft.

[0015] Preferably, it further includes a mounting ring and a torque ring, both of which are fixed to the transmission shaft, at least a portion of the torque ring is inserted into the mounting ring along the axial direction of the transmission shaft to form an accommodating space between the mounting ring and the torque ring, the circuit board is provided with the mounting ring and is located in the accommodating space, the torque sensor is provided on the torque ring and is located in the accommodating space, and the torque sensor and the circuit board are arranged opposite to each other along the radial direction of the transmission shaft.

[0016] Preferably, it also includes a battery, which is electrically connected to the circuit board and can store electrical energy provided by the power generation component.

[0017] A power system monitoring method, using the above-mentioned power system monitoring device, comprises:

[0018] The transmission shaft causes the lubricating oil to splash during the rotation process, and part of the lubricating oil flows through the bearing to take away the heat generated by the bearing, and the lubricating oil flushes the hot end of the thermoelectric generator to increase the temperature of the hot end, and the hot end and the cold end of the thermoelectric generator generate a temperature difference to generate electricity and provide electrical energy to the circuit board; or, the heat is transferred to the hot end of the thermoelectric generator through the transmission shaft, and part of the lubricating oil flows through the cold end of the thermoelectric generator to dissipate the heat of the thermoelectric generator;

[0019] The vibration sensor collects vibration information of the transmission shaft and transmits it to the controller, the temperature sensor collects temperature information in the box and transmits it to the controller, and the torque sensor collects torque information of the transmission shaft and transmits it to the controller.

[0020] Beneficial effects of the present invention:

[0021] The power system monitoring device proposed in the present invention arranges the temperature difference power generation sheet in the gear box body, and the transmission shaft drives the lubricating oil to splash during the rotation process. Part of the lubricating oil flows through the bearing to take away the heat generated by the bearing, and the lubricating oil flushes the hot end of the temperature difference power generation sheet to heat the hot end. The hot end and the cold end of the temperature difference power generation sheet generate a temperature difference to generate electricity and provide electrical energy to the circuit board, so that the heat generated by the bearing is fully utilized; the sensor is electrically connected to the circuit board, and the multiple sensors include a vibration sensor, a temperature sensor and a torque sensor, so as to monitor vibration information, temperature information and torque information, which is convenient for timely handling of faults; through the cooperation of the temperature difference power generation sheet and the sensor, not only the heat is fully utilized, but also the vibration information, temperature information and torque information can be monitored, thereby reducing the failure rate, and no battery is required, saving energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of a power system monitoring device provided in Embodiment 1 of the present invention;

[0023] Figure 2 yes Figure 1 A magnified image of point A;

[0024] Figure 3 yes Figure 1 A partial structural schematic diagram of a power system monitoring device is provided;

[0025] Figure 4 is a schematic diagram of another power system monitoring device provided in Embodiment 1 of the present invention;

[0026] Figure 5 yes Figure 4 The enlarged view of point B;

[0027] Figure 6 is a schematic diagram of a power system monitoring device provided in Embodiment 2 of the present invention;

[0028] Figure 7yes Figure 6 Enlarged view of point C;

[0029] Figure 8 is a schematic diagram of a power system monitoring device provided in Embodiment 3 of the present invention;

[0030] Fig. 9 yes Figure 8 Schematic diagram of part of the structure.

[0031] In the figure:

[0032] 110, housing; 120, bearing; 130, transmission shaft;

[0033] 11. Thermoelectric power generation sheet; 111. Heat collecting sheet; 112. Heat sink; 12. Coil; 13. Magnet; 14. Piezoelectric power generation sheet;

[0034] 21. Circuit board; 22. Torque sensor;

[0035] 30. Mounting ring; 31. First mounting portion; 32. Second mounting portion;

[0036] 40. Torque ring; 41. First support portion; 42. Second support portion;

[0037] 50. Distance ring;

[0038] 60. Fixed ring. DETAILED DESCRIPTION

[0039] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0040] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0042] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0043] Embodiment 1

[0044] See also Figures 1 to 5 The embodiment of the present invention provides a power system monitoring device, the power system includes a gear box, the gear box includes a housing 110, a bearing 120 and a transmission shaft 130, the housing 110 is provided with a bearing cavity, the bearing 120 is arranged in the bearing cavity, and the transmission shaft 130 is connected to the bearing 120 in a transmission manner. The transmission shaft 130 can be a gear shaft, a motor shaft or other shafts. The power system monitoring device is used to monitor relevant information of the gear box, generally including vibration information, temperature information and torque information.

[0045] The power system monitoring device includes a power generation component and a monitoring component. The power generation component is arranged in a box 110. The power generation component includes a temperature difference power generation sheet 11. The hot end of the temperature difference power generation sheet 11 faces the bearing cavity, and the cold end of the temperature difference power generation sheet 11 is away from the bearing cavity. The lubricating oil in the bearing cavity can flush the hot end of the temperature difference power generation sheet 11 so that the temperature difference power generation sheet 11 generates electrical energy; the monitoring component includes a circuit board 21 and multiple sensors. The sensors are electrically connected to the circuit board 21. The power generation component provides electrical energy to the circuit board 21. The multiple sensors include a vibration sensor, a temperature sensor and a torque sensor 22.

[0046] The transmission shaft 130 causes the lubricating oil to splash during the rotation process, and part of the lubricating oil flows through the bearing 120 to take away the heat generated by the bearing 120. The lubricating oil flushes the hot end of the temperature difference power generation sheet 11 to heat up the hot end. The hot end and the cold end of the temperature difference power generation sheet 11 generate a temperature difference to generate electricity and provide electrical energy to the circuit board 21, so that the heat generated by the bearing 120 is fully utilized; the sensor is electrically connected to the circuit board 21, and the multiple sensors include a vibration sensor, a temperature sensor and a torque sensor 22, which can monitor vibration information, temperature information and torque information, so as to facilitate timely handling of faults; through the cooperation of the temperature difference power generation sheet 11 and the sensor, not only the heat generated by the bearing 120 can be fully utilized, but also the vibration information, temperature information and torque information can be monitored, thereby reducing the failure rate, eliminating the need to set up batteries, and saving energy.

[0047] In other embodiments, the hot end of the thermoelectric power generation sheet 11 faces the transmission shaft 130, and the cold end of the thermoelectric power generation sheet 11 is away from the transmission shaft 130. Heat is transferred to the hot end of the thermoelectric power generation sheet 11 through the transmission shaft 130. The transmission shaft 130 drives the lubricating oil to splash during the rotation process, and part of the lubricating oil flows through the cold end of the thermoelectric power generation sheet 11 to dissipate heat from the thermoelectric power generation sheet 11. Alternatively, the cold end of the thermoelectric power generation sheet 11 is located outside the box and in contact with the air.

[0048] In addition, the multiple sensors may also include noise sensors, displacement sensors and strain sensors. The types of sensors may be set according to actual needs and are not described in detail here.

[0049] In this embodiment, the thermoelectric power generation sheet 11 can be arranged on the transmission shaft 130, or can be arranged on the box 110. In this embodiment, the thermoelectric power generation sheet 11 is fixedly connected to the transmission shaft 130, and correspondingly, the circuit board 21 electrically connected to the thermoelectric power generation sheet 11 is also arranged on the transmission shaft 130, and the plurality of sensors electrically connected to the circuit board 21 are also arranged on the transmission shaft 130.

[0050] The thermoelectric power generation sheet 11 is arranged in a ring shape around the circumference of the transmission shaft 130, and the area of ​​the thermoelectric power generation sheet 11 is increased to fully utilize the heat at the position of the bearing 120. The thermoelectric power generation sheet 11 is an existing power generation sheet, a device that converts temperature difference into electrical energy. The working principle is to generate electromotive force through two different materials at different temperatures, and generate electrical energy through circuit connection. The principle is not described in detail here.

[0051] The hot end of the thermoelectric power generation sheet 11 is provided with a heat collecting sheet 111, and the heat collecting sheet 111 is located in the bearing cavity. During the flow of lubricating oil, the lubricating oil flushes the heat collecting sheet 111, and the heat collecting sheet 111 transfers heat to the hot end of the thermoelectric power generation sheet 11 to increase the temperature of the hot end. Therefore, the setting of the heat collecting sheet 111 increases the contact area with the lubricating oil and improves the power generation effect.

[0052] The cold end of the thermoelectric power generation sheet 11 is provided with a heat sink 112, which extends away from the bearing cavity. The provision of the heat sink 112 increases the heat dissipation area, and facilitates timely dissipation of the cold end of the thermoelectric power generation sheet 11, so as to improve the power generation effect.

[0053] The thermoelectric power generation sheet 11 can be directly connected to the transmission shaft 130, or the power system monitoring device further includes a mounting ring 30, which is sleeved on the transmission shaft 130 and fixedly connected to the transmission shaft 130, and the thermoelectric power generation sheet 11 is arranged on the mounting ring 30. The circuit board 21 and the sensor are also arranged on the mounting ring 30.

[0054] In order to facilitate the use of the heat of the bearing 120, the mounting ring 30 is arranged on one side of the bearing cavity so that the temperature difference power generation sheet 11 is close to the bearing cavity. The mounting ring 30 includes a first mounting portion 31 and a second mounting portion 32 that are coaxially connected. The first mounting portion 31 is fixedly connected to the transmission shaft 130. The inner diameter of the second mounting portion 32 is larger than the outer diameter of the transmission shaft 130 and extends to a side away from the bearing 120. The temperature difference power generation sheet 11 is arranged on the first mounting portion 31, and the circuit board 21 is arranged on the second mounting portion 32.

[0055] Specifically, a receiving cavity is opened on the second mounting portion 32 , and the circuit board 21 is disposed in the receiving cavity. The wire connected to the thermoelectric power generation sheet 11 extends through the receiving cavity to the circuit board 21 and is connected to the circuit board 21 .

[0056] The vibration sensor is connected to the circuit board 21 through a vibration collection circuit, and the temperature sensor is connected to the circuit board 21 through a temperature collection circuit. Both the vibration sensor and the temperature sensor are existing sensors, which are used to monitor the vibration information and temperature information of the transmission shaft 130 and transmit them to the controller. The controller can determine whether the gear box is abnormal based on this information. The controller can be wirelessly connected to the sensor or the circuit board 21, so the controller can be arranged outside the box 110. The controller can be powered by a battery or a wired power supply. The wireless connection can be existing technologies such as wifi and Bluetooth, which will not be repeated here.

[0057] The torque sensor 22 can be directly arranged on the transmission shaft 130, or the power system monitoring device further includes a torque ring 40, which is sleeved on the transmission shaft 130 and fixedly connected to the transmission shaft 130, and the torque sensor 22 is arranged on the torque ring 40. By arranging the torque ring 40, the torque of the transmission shaft 130 is amplified, which makes it easier for the torque sensor 22 to monitor.

[0058] At least part of the torque ring 40 is inserted into the mounting ring 30 along the axial direction of the transmission shaft 130 so that an accommodating space is formed between the mounting ring 30 and the torque ring 40. The circuit board 21 is provided with the mounting ring 30 and is located in the accommodating space. The torque sensor 22 is provided on the torque ring 40 and is located in the accommodating space. The torque sensor 22 and the circuit board 21 are arranged opposite to each other along the radial direction of the transmission shaft 130.

[0059] Specifically, the torque ring 40 includes a first support portion 41 and a second support portion 42 that are coaxially connected. The first support portion 41 is fixedly connected to the transmission shaft 130. The inner diameter of the second support portion 42 is larger than the outer diameter of the transmission shaft 130. A portion of the second support portion 42 is inserted into the second mounting portion 32 of the mounting ring 30, and the torque sensor 22 is arranged on the second support portion 42.

[0060] The power system monitoring device further includes a distance ring 50, which is sleeved on the transmission shaft 130 and located between the mounting ring 30 and the torque ring 40 to play a positioning role. Specifically, one end of the distance ring 50 abuts against the first mounting portion 31 of the mounting ring 30, and the other end of the distance ring 50 abuts against the first support portion 41 of the torque ring 40.

[0061] The axial extension length of the second mounting portion 32 and the axial extension length of the second support portion 42 can be set according to actual needs, as long as a portion of the second support portion 42 can be inserted into the second mounting portion 32 of the mounting ring 30. The longer the axial extension length of the second support portion 42 is, the more obvious the deformation of the second support portion 42 will be when the transmission shaft 130 is twisted. Figure 1 and Figure 2 As shown, the second support portion 42 extends substantially axially from one end of the distance ring 50 to the other end, and has a relatively long extension length. Figure 4 and Figure 5 As shown, the axial extension length of the second mounting portion 32 is approximately equal to half of the length of the distance ring 50 , and the axial extension length of the second supporting portion 42 is approximately equal to half of the length of the distance ring 50 .

[0062] The torque sensor 22 is connected to the circuit board 21 through the torque acquisition circuit. The torque sensor 22 is an existing sensor, which can be a strain gauge or a magnetic grid. The strain gauge is an element composed of a sensitive grid and the like for measuring strain. The working principle of the resistance strain gauge is based on the strain effect, that is, when the conductor or semiconductor material is mechanically deformed under the action of an external force, its resistance value changes accordingly. By setting the strain gauge on the transmission shaft 130, when the transmission shaft 130 has a torque input, the transmission shaft 130 will be twisted, the strain gauge will be deformed, resulting in a change in resistance, causing the current in the torque acquisition circuit to change, and then the actual torque of the transmission shaft 130 can be calculated based on the current change. The working principle of the magnetic grid is magneto-electric conversion. To ensure that the magnetic head has a stable output signal amplitude, the gap between the magnetic scale and the magnetic head is small. The magnetic head can be set on the torque ring 40, and the magnetic scale is set on the mounting ring 30. The magnetic head is in contact with the magnetic grid. When the transmission shaft 130 has torque input, the transmission shaft 130 will generate torsion, drive the magnetic head to move, and make the magnetic head move relative to the magnetic scale. The actual torque of the transmission shaft 130 can be calculated based on the moving distance or angle of the magnetic head.

[0063] The power system monitoring device also includes a battery, which is electrically connected to the circuit board 21 and can store the electric energy provided by the power generation component. By providing the battery, the electric energy can be stored, and the battery can supply energy to the circuit board 21 as needed. Even if the transmission shaft 130 does not rotate, the sensor can obtain electric energy for detection.

[0064] Embodiment 2

[0065] Figure 6 and Figure 7 Embodiment 2 is shown, in which the parts identical or corresponding to those in Embodiment 1 are marked with the corresponding reference numerals in Embodiment 1. For the sake of simplicity, only the differences between Embodiment 2 and Embodiment 1 are described. The difference is that the power generation component also includes a coil 12 and a magnet 13, one of which is arranged on the transmission shaft 130, and the other is arranged on the housing 110. During the rotation of the transmission shaft 130, the coil 12 and the magnet 13 move relative to each other to generate electric energy, and the coil 12 is electrically connected to the circuit board 21. Electric energy is generated by cutting the magnetic flux lines by the coil 12, so that the relative movement between the transmission shaft 130 and the housing 110 is fully utilized, and the electric energy can be supplied to the circuit board 21.

[0066] In this embodiment, the thermoelectric power generation sheet 11 and the coil 12 share a circuit board 21 , so the coil 12 is fixedly connected to the transmission shaft 130 , the circuit board 21 is disposed on the transmission shaft 130 , and the magnet 13 is fixedly connected to the housing 110 .

[0067] Specifically, the coil 12 is disposed on the mounting ring 30 , the outer diameter of the second mounting portion 32 is greater than the outer diameter of the first mounting portion 31 , and the coil 12 is disposed at the step surface between the first mounting portion 31 and the second mounting portion 32 .

[0068] The power system monitoring device further includes a fixing ring 60, which is disposed on the housing 110 and around the transmission shaft 130, and the magnet 13 is fixed to the fixing ring 60. Specifically, the fixing ring 60 is provided with a plurality of receiving holes, and one or more magnets 13 are disposed in each receiving hole.

[0069] The power system also includes a motor, which is arranged outside the housing 110 and can drive the transmission shaft 130 to rotate. The coil 12 cuts the electromagnetic waves emitted by the motor to the surrounding space to generate electrical energy during the synchronous rotation with the transmission shaft 130. Permanent magnet DC motors are commonly used in current motors. The so-called permanent magnet DC motor refers to a motor in which the inner stator of the motor uses a permanent magnet to interact with the magnetic field generated by the outer rotor energized coil to generate torque and rotate. When the motor rotates, there will inevitably be electromagnetic waves. The iron shell of the motor can shield most of the electromagnetic waves, but some electromagnetic waves still leak out, so the coil 12 can make full use of the electromagnetic waves. In addition, the motor can also be a generator, such as a power generation device integrating a gear box and a generator. In addition, the emission source of the electromagnetic wave can also be an emission circuit board.

[0070] Embodiment 3

[0071] Figure 8 and Fig. 9 The third embodiment is shown, in which the components identical or corresponding to the first embodiment are marked with the corresponding reference numerals of the first embodiment. For the sake of simplicity, only the differences between the third embodiment and the first embodiment are described. The difference is that the power generation component further includes a plurality of piezoelectric power generation sheets 14, which are fixedly arranged on the transmission shaft 130 and generate electric energy under the vibration of the transmission shaft 130. By providing the piezoelectric power generation sheets 14, the vibration energy is fully utilized.

[0072] The piezoelectric generator 14 is an existing generator, specifically a piezoelectric ceramic. The piezoelectric ceramic has a sensitive characteristic and can convert extremely weak mechanical vibrations into electrical signals. Because the internal structure of the piezoelectric ceramic has both positive and negative charges, when subjected to pressure or vibration, the distribution of positive and negative charges inside will change, thereby generating a potential difference and current, forming electrical energy output.

[0073] The piezoelectric generator 14 can be directly disposed on the transmission shaft 130 , or can be disposed on the mounting ring 30 or the torque ring 40 .

[0074] Embodiment 4

[0075] This embodiment provides a power system monitoring method, which uses the power system monitoring device in any of the above embodiments, including:

[0076] The transmission shaft 130 causes the lubricating oil to splash during the rotation process, and part of the lubricating oil flows through the bearing 120 to take away the heat generated by the bearing 120, and the lubricating oil flushes the hot end of the thermoelectric power generation sheet 11 to increase the temperature of the hot end, and the hot end and the cold end of the thermoelectric power generation sheet 11 generate a temperature difference to generate electricity and provide electrical energy to the circuit board 21;

[0077] The vibration sensor collects vibration information of the transmission shaft 130 and transmits it to the controller, the temperature sensor collects temperature information in the housing 110 and transmits it to the controller, and the torque sensor 22 collects torque information of the transmission shaft 130 and transmits it to the controller.

[0078] The above-mentioned several power generation components can be freely combined under the condition of no contradiction, for example, the thermoelectric power generation sheet 11, the coil 12 and the magnet 13 generate electricity at the same time, the thermoelectric power generation sheet 11 and the piezoelectric power generation sheet 14 generate electricity at the same time, and the thermoelectric power generation sheet 11, the piezoelectric power generation sheet 14, the coil 12 and the magnet 13 generate electricity at the same time. In the process of the transmission shaft 130 rotating relative to the box 110, the coil 12 and the magnet 13 rotate relative to each other, the coil 12 cuts the magnetic flux lines of the magnet 13 to form current, and the piezoelectric power generation sheet 14 generates electric energy under the vibration of the transmission shaft 130.

[0079] The above embodiments are only to illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and modifications, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A power system monitoring device, characterized in that: The power system comprises a gear box, the gear box comprising a housing (110), a bearing (120) and a transmission shaft (130), the housing (110) being provided with a bearing cavity, the bearing (120) being arranged in the bearing cavity, the transmission shaft (130) being transmission-connected to the bearing (120), and the power system monitoring device comprising: A power generation component is arranged in the housing (110), the power generation component comprises a thermoelectric power generation sheet (11), the hot end of the thermoelectric power generation sheet (11) faces the bearing cavity, the cold end of the thermoelectric power generation sheet (11) is away from the bearing cavity, and the lubricating oil in the bearing cavity can flush the hot end of the thermoelectric power generation sheet (11) so that the thermoelectric power generation sheet (11) generates electric energy; or, the hot end of the thermoelectric power generation sheet (11) faces the transmission shaft (130), the cold end of the thermoelectric power generation sheet (11) is away from the transmission shaft (130), heat is transferred to the hot end of the thermoelectric power generation sheet (11) through the transmission shaft (130), and the cold end of the thermoelectric power generation sheet (11) dissipates heat through lubricating oil or air; The monitoring component comprises a circuit board (21) and a plurality of sensors, wherein the sensors are electrically connected to the circuit board (21), the power generation component provides electrical energy to the circuit board (21), and the plurality of sensors comprise a vibration sensor, a temperature sensor and a torque sensor (22).

2. The power system monitoring device according to claim 1, characterized in that: The temperature difference power generation sheet (11) is fixedly connected to the transmission shaft (130) and is arranged in a ring shape around the circumference of the transmission shaft (130), and the circuit board (21) is arranged on the transmission shaft (130).

3. The power system monitoring device according to claim 1, characterized in that: A heat collecting plate (111) is provided at the hot end of the thermoelectric power generation plate (11), and the heat collecting plate (111) is located in the bearing cavity; and / or a heat sink (112) is provided at the cold end of the thermoelectric power generation plate (11), and the heat sink (112) extends away from the bearing cavity.

4. The power system monitoring device according to claim 1, characterized in that: The power generation component also includes a plurality of piezoelectric power generation sheets (14), wherein the piezoelectric power generation sheets (14) are fixedly arranged on the transmission shaft (130) and generate electric energy under the vibration of the transmission shaft (130).

5. The power system monitoring device according to claim 1, characterized in that: The power generation component further comprises a coil (12) and a magnet (13); one of the coil (12) and the magnet (13) is arranged on the transmission shaft (130), and the other is arranged on the housing (110); during the rotation of the transmission shaft (130), the coil (12) and the magnet (13) move relative to each other to generate electrical energy; and the coil (12) is electrically connected to the circuit board (21).

6. The power system monitoring device according to claim 5, characterized in that: The coil (12) is fixedly connected to the transmission shaft (130), the circuit board (21) is arranged on the transmission shaft (130), and the magnet (13) is fixedly connected to the box (110).

7. The power system monitoring device according to claim 6, characterized in that: The power system also includes a motor, which is arranged outside the housing (110) and is capable of driving the transmission shaft (130) to rotate. The coil (12) cuts electromagnetic waves emitted by the motor to the surrounding space to generate electrical energy during the process of synchronous rotation with the transmission shaft (130).

8. The power system monitoring device according to claim 1, characterized in that: The invention also comprises a mounting ring (30) and a torque ring (40), wherein the mounting ring (30) and the torque ring (40) are both fixed to the transmission shaft (130), and at least a portion of the torque ring (40) is inserted into the mounting ring (30) along the axial direction of the transmission shaft (130) so that an accommodation space is formed between the mounting ring (30) and the torque ring (40), the circuit board (21) is provided with the mounting ring (30) and is located in the accommodation space, the torque sensor (22) is provided on the torque ring (40) and is located in the accommodation space, and the torque sensor (22) and the circuit board (21) are arranged opposite to each other along the radial direction of the transmission shaft (130).

9. The power system monitoring device according to any one of claims 1 to 8, characterized in that: It also includes a storage battery, which is electrically connected to the circuit board (21) and can store the electric energy provided by the power generation component.

10. A power system monitoring method, characterized in that: The power system monitoring device according to any one of claims 1 to 9 comprises: The transmission shaft (130) causes lubricating oil to splash during rotation, part of the lubricating oil flows through the bearing (120) to take away the heat generated by the bearing (120), and the lubricating oil flushes the hot end of the thermoelectric power generation sheet (11) to increase the temperature of the hot end, and the hot end and the cold end of the thermoelectric power generation sheet (11) generate a temperature difference to generate electricity and provide electrical energy to the circuit board (21); or, heat is transferred to the hot end of the thermoelectric power generation sheet (11) through the transmission shaft (130), and part of the lubricating oil flows through the cold end of the thermoelectric power generation sheet (11) to dissipate heat from the thermoelectric power generation sheet (11); The vibration sensor collects vibration information of the transmission shaft (130) and transmits it to the controller, the temperature sensor collects temperature information in the housing (110) and transmits it to the controller, and the torque sensor (22) collects torque information of the transmission shaft (130) and transmits it to the controller.

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