High-speed rotor temperature measurement system based on conductive slip ring

Abstract

The invention provides a high-speed rotor temperature measurement system based on a conductive slip ring, and the system comprises a measured rotor part, a thermocouple temperature measurement sensor, a cambered surface rigid coupling, a high-speed conductive slip ring, a cooling oil pump, a temperature transmitter, and a control end. And the contact part of the ring sheet and the electric brush is always in an oil bath environment, so that friction loss is reduced through lubrication, heat generated by high-speed friction can be quickly dissipated, and the electric brush is effectively prevented from being fused due to overheating.

Description

Technical Field

[0001] This invention relates to the field of temperature monitoring technology, and in particular to a high-speed rotor temperature measurement system based on a conductive slip ring. Background Technology

[0002] In high-tech fields such as new energy vehicles and aero engines, temperature monitoring of high-speed motor rotors is crucial for the safe and stable operation of equipment, efficiency optimization, and extended service life. When the rotor speed exceeds 30,000 rpm, real-time temperature monitoring faces severe challenges. Existing technologies mainly rely on two types of solutions: wireless temperature measurement and wired temperature measurement, but both have significant drawbacks.

[0003] Wireless temperature measurement systems require equipment to be installed on the rotating shaft, which not only disrupts the rotor's dynamic balance and increases the risk of breakage, but is also significantly limited by installation space. Its battery-powered mode cannot meet the needs of long-term continuous monitoring, and electromagnetic interference at high speeds can easily lead to data loss or distortion, seriously affecting the reliability of monitoring.

[0004] Wired temperature measurement solutions rely on conductive slip rings to transmit signals between the rotating and fixed ends. The core friction pair consists of brush filaments and a ring plate, which slide relative to each other during operation. However, at high speeds above 30,000 rpm, the friction between the pair generates a large amount of heat that is difficult to dissipate, causing the brush filaments to easily melt, signal transmission to be interrupted, and the temperature measurement system to fail.

[0005] Currently, foreign companies have achieved wired temperature measurement of high-speed rotors, but their products suffer from problems such as strict technological blockade, long delivery cycles, high prices, and lack of after-sales support. This has led to a significant increase in experimental costs for domestic research institutes and enterprises, hindering technological breakthroughs in related industries. No domestic manufacturer has yet overcome this technical challenge, and existing solutions cannot simultaneously ensure the stability, continuity, and accuracy of temperature measurement under high-speed operating conditions. Therefore, a new type of wired temperature measurement system for high-speed rotors is urgently needed to overcome the current technological bottlenecks. Summary of the Invention

[0006] To address the aforementioned problems, the present invention aims to provide a high-speed rotor temperature measurement system based on conductive slip rings. This system addresses issues in existing wireless temperature measurement systems, such as damage to rotor dynamic balance, limited installation space, inability to perform long-term monitoring with battery power, and data distortion due to high-speed electromagnetic interference. It also addresses the technical shortcomings of traditional wired temperature measurement systems, including high-speed frictional heat generation from conductive slip ring friction pairs, easy melting of brush filaments, signal transmission interruption, and high maintenance difficulty. The present invention provides a high-speed rotor wired temperature measurement system that, through innovative structural design and cooling technology, achieves continuous and stable transmission of temperature signals under high-speed operating conditions, while simultaneously improving system reliability, ease of installation, and maintenance efficiency.

[0007] The present invention provides a high-speed rotor temperature measurement system based on a conductive slip ring, including a rotor component under test (1), a thermocouple temperature sensor (2), an arc-shaped rigid coupling (3), a high-speed conductive slip ring (4), a cooling oil pump (5), a temperature transmitter (6), and a control terminal (7). The thermocouple temperature sensor (2) is embedded in the groove of the rotor component (1) to collect rotor temperature signals in real time. The signal line of the thermocouple temperature sensor (2) passes through the hollow inner hole of the arc-shaped rigid coupling (3) and is connected to the ring lead of the high-speed conductive slip ring (4). The cooling oil pump (5) is connected to the high-speed conductive slip ring (4) through the pipeline to form a circulating oil cooling circuit, so that the ring plate of the high-speed conductive slip ring (4) and the contact part of the brush are in an oil bath environment. The brush wire of the high-speed conductive slip ring (4) is connected to the input terminal of the temperature transmitter (6). The temperature transmitter (6) filters, amplifies, compensates for cold junctions and performs analog-to-digital conversion on the thermoelectric potential signal and outputs a digital signal, which is received by the control terminal (7) and displayed as the temperature information of the rotor component (1) under test.

[0008] Optionally, the arc-shaped rigid coupling (3) connects the rotor component (1) under test to the rotating component (22) of the high-speed conductive slip ring (4). The arc-shaped rigid coupling (3) includes a left connecting flange (10), a connecting shaft (11) and a right connecting flange (12). The left connecting flange (10) is fixed to the shaft system of the rotor component (1) under test, and the right connecting flange (12) is connected to the rotating component (22) of the high-speed conductive slip ring (4).

[0009] Optionally, the two ends of the connecting shaft (11) are regular hexahedral arc surface structures, which are adapted to and cooperate with the regular hexagonal inner holes of the left connecting flange (10) and the right connecting flange (12).

[0010] Optionally, a regular hexagonal inner hole is provided through the center of the end face of the left connecting flange (10) and the right connecting flange (12), and multiple threaded holes and countersunk holes are provided on the end face.

[0011] Optionally, the arc-shaped rigid coupling (3) includes a left connecting flange (10), a connecting shaft (11) and a right connecting flange (12). The left connecting flange (10) and the right connecting flange (12) are connected by the connecting shaft (11), and the right connecting flange (12) is connected to the rotating component (22) of the high-speed conductive slip ring (4).

[0012] Optionally, the cooling oil pump (5) forms a circulating oil cooling circuit with the oil outlet pipe (35), condenser (37) and return pipe (36). The cooling oil output by the cooling oil pump (5) enters the contact part between the ring plate and the brush through the oil inlet (32) of the high-speed conductive slip ring. After completing the lubrication and heat dissipation, it flows out through the oil outlet (33) of the high-speed conductive slip ring and is cooled by the condenser (37) and returned to the cooling oil pump (5) through the return pipe (36) in sequence, forming a closed loop.

[0013] Optionally, the thermocouple temperature sensor (2) is provided with a first signal line (8) and a second signal line (9), which are led out from the rotor component (1) being measured.

[0014] Compared with the prior art, the high-speed rotor temperature measurement system based on conductive slip rings provided by the present invention has the following advantages: The high-speed rotor temperature measurement system based on conductive slip ring provided by this invention can continuously inject oil into the conductive slip ring through a cooling oil pump, so that the contact part between the ring and the brush is always in an oil bath environment. This not only reduces friction loss through lubrication, but also quickly dissipates the heat generated by high-speed friction, effectively preventing the brush from melting due to overheating. This ensures that the temperature signal is continuously and stably transmitted at high speeds above 30,000 rpm, effectively solving the technical problem of signal interruption in traditional wired temperature measurement systems. Meanwhile, the arc-shaped rigid coupling, through the matching fit between the connecting shaft with the hexagonal inner holes of the left and right connecting flanges, achieves a rigid connection between the measured rotor and the high-speed conductive slip ring, significantly reducing the concentricity requirements of the shaft system. This compensates for minor axial movement and center misalignment generated during high-speed rotation, preventing impact damage to the conductive slip ring and significantly improving the connection stability and operational reliability of the system at high speeds. In addition, the thermocouple temperature sensor, based on the Seebeck effect, ensures the accuracy of temperature-to-electrical signal conversion. The multi-module collaborative processing flow of the temperature transmitter achieves noise reduction, compensation, and digital conversion of weak signals, further ensuring the accuracy of temperature measurement data. This provides a solution for high-speed rotor temperature monitoring that combines accuracy, continuity, and safety.

[0015] The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0016] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the high-speed rotor temperature measurement system according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the rotor component under test and the thermocouple temperature sensor in an embodiment of the present invention. Figure 3 This is a schematic diagram of the arc-shaped rigid coupling structure according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the arc-shaped rigid coupling according to an embodiment of the present invention from another perspective; Figure 5 This is a schematic diagram showing the inclination of the connecting shaft in the arc-shaped rigid coupling according to an embodiment of the present invention; Figure 6 This is a schematic diagram of a high-speed conductive slip ring structure according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the temperature transmitter and control terminal structure according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the left connecting flange structure of the arc-shaped rigid coupling according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the connecting shaft structure of the arc-shaped rigid coupling according to an embodiment of the present invention; Figure 10 This is a schematic diagram of the right connecting flange structure of the arc-shaped rigid coupling according to an embodiment of the present invention; Figure 11 This is a schematic diagram of the condenser structure according to an embodiment of the present invention; Wherein, 1-The rotor under test, 2-Thermocouple temperature sensor, 3-Arched rigid coupling, 4-High-speed conductive slip ring, 5-Cooling oil pump, 6-Temperature transmitter, 7-Control terminal, 8-First signal line, 9-Second signal line, 10-Left connecting flange, 11-Connecting shaft, 12-Right connecting flange, 13-First inner hole, 14-First threaded hole, 15-First countersunk hole, 17-Left end, 18-Second threaded hole, 19-Second countersunk hole, 20-Second inner hole. 21-Right end, 22-Rotating component, 23-First ring lead wire, 24-Second ring lead wire, 25-First ring plate, 26-Second ring plate, 27-Brush assembly, 28-First brush, 29-Second brush, 30-First brush wire, 31-Second brush wire, 32-High-speed conductive slip ring oil inlet, 33-High-speed conductive slip ring oil outlet, 34-Oil outlet valve, 35-Oil outlet pipe, 36-Return pipe, 37-Condenser, 38-Oil guide groove, 39-Oil inlet valve. Detailed Implementation

[0017] The embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the present invention and are not restrictive.

[0018] See appendix Figures 1-9 This invention provides a high-speed rotor wired temperature measurement system, including a rotor component under test 1, a thermocouple temperature sensor 2, a curved rigid coupling 3, a high-speed conductive slip ring 4, a cooling oil pump 5, a temperature transmitter 6, and a control terminal 7. In this embodiment, a speed exceeding 10,000 rpm is defined as high speed.

[0019] Thermocouple temperature sensor 2 is embedded in the groove of the rotor component 1 under test, and is used to collect rotor temperature signals in real time. Two signal lines of thermocouple temperature sensor 2 are led out from the rotor component 1 under test. For example... Figure 2 As shown, the thermocouple temperature sensor 2 is equipped with a first signal line 8 and a second signal line 9, which are led out from the rotor component 1 being measured. During installation, the rotor shaft and the slip ring rotating component are first connected through the arc-shaped rigid coupling 3, and the flange bolts are tightened appropriately to achieve initial alignment using its self-adaptive characteristics; the cooling oil pump 5 is started for no-load circulation to check for leaks in the seal; the rotor is run at low speed for trial operation, and the temperature signal is observed to be stable through the control terminal 7; the speed is gradually increased to the target speed to complete the system calibration.

[0020] like Figure 3 As shown, the arc-shaped rigid coupling 3 includes a left connecting flange 10, a connecting shaft 11, and a right connecting flange 12. The left connecting flange 10 and the right connecting flange 12 are connected by the connecting shaft 11. The left connecting flange 10 is fixed to the shaft system of the rotor component 1 under test, and the right connecting flange 12 is connected to the rotating component 22 of the high-speed conductive slip ring 4. The left and right ends of the connecting shaft 11 are designed as regular hexahedral structures, and each outer surface is an arc surface, which is adapted to fit the regular hexagonal inner hole at the center of the left and right connecting flanges, respectively.

[0021] like Figures 4-5 As shown, the left end of the arc-shaped rigid coupling is connected to the left connecting flange 10, and the right end is connected to the right connecting flange 12. During the design and installation, the total axial length from the left connecting flange 10 to the right connecting flange 12 will exceed the total length of the connecting shaft 11 by 0.5 to 1.5 mm. In this way, the axial movement generated when the test piece shaft rotates at high speed can be eliminated by the rigid coupling 11. Since the contact surface of the connecting shaft 11 is an arc surface, the contact between the connecting shaft 11 and the left connecting flange 10 and the right connecting flange 12 is a line contact rather than a surface contact. From the cross-sectional view, it is a point contact. The arc-shaped rigid coupling can swing relative to the left connecting flange 10 and the right connecting flange 12 with a swing arc of R°. During installation, the relative position requirement of the left connecting flange 10 and the right connecting flange 12 can be within the X value range, thereby greatly reducing the shaft concentricity requirement. When the X value is exceeded, the connecting shaft 11 will be in an abnormal working state and will be subjected to a large force. At this time, the groove 40 in the middle of the connecting shaft 11 will break, thereby protecting the high-speed conductive slip ring 4 at the rear end.

[0022] The first signal line 8 and the second signal line 9 of the thermocouple temperature sensor 2 pass through the hollow inner hole of the arc-shaped rigid coupling 3. For example... Figure 8 As shown, a regular hexagonal first inner hole 13 is provided through the center of the end face of the left connecting flange 10. The end face of the left connecting flange 10 has a circumferential array of multiple first threaded holes 14 and first countersunk holes 15. The left connecting flange 10 is adapted to the left end 17 of the connecting shaft 11 through the regular hexagonal first inner hole 13. The left connecting flange 10 is fixed to the shaft system of the rotor component 8 under test through the first countersunk holes 15 (or first threaded holes 14) on it.

[0023] like Figure 10 As shown, a regular hexagonal second inner hole 20 is provided through the center of the end face of the right connecting flange 12. Multiple second threaded holes 18 and second countersunk holes 19 are arranged in a circular array on the end face of the right connecting flange 12. The right connecting flange 12 is adapted to be mounted on the right end 21 of the connecting shaft 11 through the regular hexagonal second inner hole 20. The right connecting flange 12 is connected to the rotating component 22 of the high-speed conductive slip ring 4 through the second countersunk hole 19 (or second threaded hole 18) on it.

[0024] The two signal lines from the temperature sensor 1, namely the first signal line 8 and the second signal line 9, are connected to the two ring leads (the first ring lead 23 and the second ring lead 24) of the high-speed conductive slip ring 4 by welding. The two leads (the first ring lead 23 and the second ring lead 24) of the high-speed conductive slip ring 4 are respectively led out from the first ring plate 25 and the second ring plate 26 on the high-speed conductive slip ring 4. The first ring plate 25 and the second ring plate 26 are both fixed on the rotating part 22 of the high-speed conductive slip ring 4.

[0025] The brush assembly 27 on the high-speed conductive slip ring 4 is mounted on the fixed end of the high-speed conductive slip ring 4. The two brushes (first brush 28 and second brush 29) on the brush assembly 27 are respectively connected to the first ring plate 25 and the second ring plate 26. Two brush wires (first brush wire 30 and second brush wire 31) are led out from the brush assembly 27. The first brush wire 30 and the second brush wire 31 are connected to the first signal line 8 and the second signal line 9 led out from the thermocouple temperature sensor 2.

[0026] The cooling oil pump 5 pumps oil through the oil outlet valve 34, oil outlet pipe 35, and oil inlet 32 ​​of the high-speed conductive slip ring 4. The oil enters the contact areas between the first ring plate 25, the second ring plate 26, and the first brush 28 and the second brush 29, thereby providing lubrication and heat dissipation. The oil then passes through the high-speed conductive slip ring outlet 33 and then through the return pipe 36 into the condenser 37. The oil is cooled in the oil guide groove 38 in the condenser 37 and then passes through the oil inlet valve 39 into the oil pump 5. This achieves the circulating oil cooling process of the conductive slip ring, reducing thermal wear between the first brush 28, the second brush 29, and the first ring plate 25 and the second ring plate 26, thus ensuring the normal operation of the conductive slip ring during high-speed rotation. Optionally, the system in this embodiment also includes a temperature sensor and a controller. The temperature sensor is installed on the return pipe 36 to monitor the return oil temperature. The controller is connected to the temperature sensor and the cooling oil pump 5, and dynamically adjusts the speed of the cooling oil pump 5 or the cooling power of the condenser 37 based on the return oil temperature.

[0027] The outputs of the first brush line 30 and the second brush line 31, which are the outputs of the thermocouple temperature sensor 2, are led out from the high-speed conductive slip ring and input to the temperature transmitter 6 for signal conversion. Inside the temperature transmitter 6, the weak thermoelectric potential signal is first filtered by the signal conditioning circuit to remove electromagnetic interference noise in the high-speed rotating environment, and then the signal is amplified to a range suitable for analog-to-digital conversion. Subsequently, the built-in temperature sensor collects the ambient temperature of the transmitter and corrects the thermoelectric potential signal through a cold junction compensation algorithm to eliminate errors caused by changes in the reference junction temperature. Then, the analog-to-digital conversion module converts the corrected analog signal into a digital signal. The data processing unit converts the digital signal into the corresponding temperature value according to the preset thermocouple calibration curve and encapsulates it into a standard digital signal 40 according to the RS485 protocol format. Finally, the digital signal 40 is output to the control terminal 7 (such as a PC) for acquisition and display to obtain the measured temperature value.

[0028] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A high-speed rotor temperature measurement system based on a conductive slip ring, characterized in that, The components include the rotor under test (1), thermocouple temperature sensor (2), arc-shaped rigid coupling (3), high-speed conductive slip ring (4), cooling oil pump (5), temperature transmitter (6) and control terminal (7). The thermocouple temperature sensor (2) is embedded in the groove of the rotor component (1) to collect rotor temperature signals in real time. The signal line of the thermocouple temperature sensor (2) passes through the hollow inner hole of the arc-shaped rigid coupling (3) and is connected to the ring lead of the high-speed conductive slip ring (4). The cooling oil pump (5) is connected to the high-speed conductive slip ring (4) through the pipeline to form a circulating oil cooling circuit, so that the ring plate of the high-speed conductive slip ring (4) and the contact part of the brush are in an oil bath environment. The brush wire of the high-speed conductive slip ring (4) is connected to the input terminal of the temperature transmitter (6). The temperature transmitter (6) filters, amplifies, compensates for cold junctions and performs analog-to-digital conversion on the thermoelectric potential signal and outputs a digital signal, which is received by the control terminal (7) and displayed as the temperature information of the rotor component (1) under test.

2. The high-speed rotor temperature measurement system based on a conductive slip ring according to claim 1, characterized in that, The arc-shaped rigid coupling (3) connects the rotor component (1) under test to the rotating component (22) of the high-speed conductive slip ring (4).

3. The high-speed rotor temperature measurement system based on a conductive slip ring according to claim 2, characterized in that, The two ends of the connecting shaft (11) are regular hexahedral arc surface structures, which are adapted to and cooperate with the regular hexagonal inner holes of the left connecting flange (10) and the right connecting flange (12).

4. The high-speed rotor temperature measurement system based on a conductive slip ring according to claim 2, characterized in that, The center of the end face of the left connecting flange (10) and the right connecting flange (12) is provided with a regular hexagonal inner hole, and multiple threaded holes and countersunk holes are provided on the end face.

5. The high-speed rotor temperature measurement system based on a conductive slip ring according to claim 2, characterized in that, The arc-shaped rigid coupling (3) includes a left connecting flange (10), a connecting shaft (11) and a right connecting flange (12). The left connecting flange (10) and the right connecting flange (12) are connected by the connecting shaft (11), and the right connecting flange (12) is connected to the rotating part (22) of the high-speed conductive slip ring (4).

6. The high-speed rotor temperature measurement system based on a conductive slip ring according to claim 1, characterized in that, The cooling oil pump (5) forms a circulating oil cooling circuit with the oil outlet pipe (35), condenser (37) and return pipe (36). The cooling oil output by the cooling oil pump (5) enters the contact part between the ring plate and the brush through the oil inlet (32) of the high-speed conductive slip ring. After completing the lubrication and heat dissipation, it flows out through the oil outlet (33) of the high-speed conductive slip ring and is cooled by the condenser (37) and returned to the cooling oil pump (5) through the return pipe (36) in sequence, forming a closed loop.

7. The high-speed rotor temperature measurement system based on a conductive slip ring according to any one of claims 1-5, characterized in that, The thermocouple temperature sensor (2) is provided with a first signal line (8) and a second signal line (9), which are led out from the rotor component (1) being measured.

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