A batch temperature measurement system suitable for key connection parts of large hydropower stations

Abstract

The application discloses a batch temperature measuring system suitable for key connecting parts of large hydropower stations, which comprises a temperature measuring gasket, a temperature measuring unit and a monitoring system; the temperature measuring gasket is installed at a bolt connecting part and comprises a gasket compression part closely combined with the bolt, a tubular part suspendedly arranged and a temperature measuring element arranged in the tubular part; the temperature measuring unit is connected with the temperature measuring gasket through a lead-out wire, collects and calculates temperature values; and the monitoring system receives and displays temperature data in real time. The temperature sensor is integrated in the gasket structure, non-contact precise temperature measurement is realized by utilizing metal heat conduction, and the scene requirement of narrow space and batch monitoring is met.

Description

Technical Field

[0001] This invention relates to the field of equipment temperature measurement technology, and in particular to a batch temperature measurement system suitable for key connection parts of large hydropower stations. Background Technology

[0002] In large hydroelectric power plants, turbine generator units undergo annual overhauls. These overhauls often involve disassembling connections for testing or inspecting specific components. Alternatively, they may involve various project modifications, including the dismantling, modification, and reinstallation of critical parts. Since a large hydroelectric generator unit involves numerous and diverse pieces of equipment, ensuring the proper reinstallation of connections is crucial. The temperature of these connections is a key indicator for determining proper installation.

[0003] Currently, for large-volume, high-voltage connection parts, a high-current micro-ohmmeter is typically used to test the connection resistance. However, even if the test is passed, temperature measurement cannot be avoided during subsequent operation. Furthermore, for connection parts where one end is an insulation side and the other is a conductor side, in addition to using a torque wrench to ensure the tightening force is up to standard, the temperature of the connection part becomes a crucial indicator. Therefore, temperature measurement of critical connection parts is extremely important.

[0004] Currently, for disassembled parts, temperature is typically measured using a temperature gun or external thermal imager during routine inspections. However, this method requires opening the equipment cabinet or approaching the equipment, increasing the workload and risk. Secondly, for secondary equipment connections, which are small and have low voltage levels, it's impossible to use a high-current micro-ohmmeter for connection resistance testing. Traditional high-precision multimeters also cannot measure as accurately as high-current micro-ohmmeters. Furthermore, temperature measurements will be necessary during subsequent operation for future maintenance, further increasing labor costs and risks. Summary of the Invention

[0005] To address the aforementioned issues, this invention provides a batch temperature measurement system suitable for critical connection parts in large hydropower stations. This system enables accurate and rapid batch temperature measurement of critical connection parts in large hydropower stations and is applicable to confined spaces, reducing the need for staff and significantly improving work efficiency.

[0006] This invention provides a batch temperature measurement system suitable for critical connection parts of large hydropower stations, and the specific technical solution is as follows: The system includes several temperature measuring pads, which are installed at the bolt connections of various connection parts to be tested in the hydropower station. Each temperature measuring pad includes a pad crimping part, a tubular part, and a temperature measuring element. The pad crimping part is tightly fitted to the bolt, the tubular part is suspended around the pad crimping part and does not contact the bolt, and the temperature measuring element is located inside the tubular part. A temperature measuring unit is connected to the temperature measuring pad and corresponds to the temperature at the location of the temperature measuring pad. The monitoring system is connected to the temperature measuring unit to receive and display temperature data in real time.

[0007] Furthermore, the gasket pressing portion of the temperature measuring gasket and the tubular portion are integrally formed, and the axis of the tubular portion is parallel to the axis of the gasket pressing portion.

[0008] This structural design achieves a compact structure and convenient installation of the temperature measuring pad, solving the problems of difficult installation and positioning of the temperature measuring element and insufficient mechanical strength of the pad.

[0009] Furthermore, the temperature sensing element is a platinum resistance thermometer, which is disposed inside the tubular portion and is insulated from the tubular portion. The temperature measuring pad also includes platinum resistance leads; The temperature measuring unit includes a PLC temperature measuring module and a power supply module. The power supply module is connected to the PLC temperature measuring module to supply power to the PLC temperature measuring module. The PLC temperature measuring module is connected to the temperature measuring platinum resistance thermometer through the platinum resistance lead wire to obtain the temperature measurement data of the temperature measuring pad and calculate the temperature value based on the temperature measurement data.

[0010] Furthermore, the temperature measuring platinum resistance is a PT100 platinum resistance, and the platinum resistance lead is a three-wire lead.

[0011] Eliminating the influence of lead resistance on measurement accuracy reduces temperature measurement errors caused by lead resistance during long-distance transmission.

[0012] Furthermore, the platinum resistance leads of each of the temperature measuring pads are respectively connected to different input channels of the PLC temperature measuring module, realizing simultaneous batch acquisition of multiple temperature measuring points, solving the problem of low efficiency of single-point measurement and inability to meet the monitoring needs of a large number of connection parts in large hydropower stations.

[0013] Furthermore, the PLC temperature measurement module performs linearization processing and temperature compensation calculation on the collected resistance values, converting the resistance values ​​of the PT100 platinum resistance thermometer into standard temperature values, thus avoiding temperature calculation errors caused by the nonlinear characteristics of the platinum resistance thermometer.

[0014] Furthermore, the temperature measuring pad is made of metal, and the temperature measuring platinum resistance thermometer obtains the temperature of the bolt connection through the heat conduction of the metal in the pressing part of the pad.

[0015] The temperature measuring pad is made of metal. Although the temperature measuring part is not directly pressed onto the bolt part, the thermal conductivity of metal allows it to accurately measure the contact temperature.

[0016] Furthermore, the temperature measuring element is a temperature measuring optical fiber, the temperature measuring unit is a fiber optic temperature measuring host, the temperature measuring optical fiber is inserted into the tubular part, and one end of the fiber optic temperature measuring host is connected to the fiber optic temperature measuring host, and the fiber optic temperature measuring host is communicatively connected to the monitoring system.

[0017] By using a temperature-measuring optical fiber, reliable temperature measurement was achieved in environments with strong electromagnetic interference, solving the problems of interference and unstable measurement of platinum resistance temperature measurement signals in areas with severe electromagnetic interference.

[0018] Furthermore, the monitoring system includes an alarm module, which activates an audible and visual alarm signal when the temperature exceeds a preset threshold.

[0019] Furthermore, the monitoring system also includes a data storage unit and a processing unit. The data storage unit stores historical temperature data, and the processing unit is connected to the data storage unit to acquire historical temperature data and generate temperature change trend curves, thereby enabling historical data tracing and temperature trend analysis for predictive maintenance.

[0020] The beneficial effects of this invention are as follows: 1. This invention designs a gasket structure. The temperature measuring gasket includes a gasket pressing part that fits tightly with the bolt, a tubular part that is suspended around the gasket pressing part and does not contact the bolt, and a temperature measuring element disposed within the tubular part. By integrating the temperature measuring element into the gasket structure, the temperature measuring unit is connected to the temperature measuring gasket to obtain the temperature, and the monitoring system is connected to the temperature measuring unit to receive and display the temperature data in real time. This realizes real-time, batch, and automated monitoring of the temperature of key connection parts, and solves the problems of large workload, high risk, and difficulty in measuring temperature in confined spaces caused by manual inspection requiring opening the cabinet door of the operating equipment or approaching the operating equipment.

[0021] 2. The present invention achieves non-direct contact temperature measurement between the temperature measuring element and the bolt by tightly fitting the gasket pressing part of the temperature measuring gasket with the bolt, and by setting the temperature measuring element inside the tubular part and obtaining the temperature at the bolt connection through the metal heat conduction of the gasket pressing part.

[0022] 3. This invention connects the PLC temperature measurement module with the lead wires of multiple temperature measurement pads, and connects the monitoring system with the PLC temperature measurement module, thereby realizing the systematic collection, centralized processing and real-time monitoring of large-scale temperature measurement data, solving the problem of scattered manual temperature measurement data and the inability to systematically manage it. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the temperature measuring pad structure of the present invention.

[0024] Figure 2 This is a schematic diagram of the overall temperature measurement architecture of the system of the present invention.

[0025] Figure 3 This is a schematic diagram of the fiber optic temperature measurement architecture of the present invention.

[0026] Explanation of reference numerals in the attached diagram: 1-Temperature measuring pad, 2-Pad crimping part, 3-Tube-shaped part, 4-Temperature measuring element, 5-Platinum resistance lead wire, 6-PLC temperature measuring module, 7-Power supply module, 8-Monitoring system, 9-Fiber optic temperature measuring host. Detailed Implementation

[0027] The technical solutions in the embodiments of the present invention are clearly and completely described in the following description. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0028] In the description of the embodiments of the present invention, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is conventionally placed during use, or the orientation or positional relationship in which those skilled in the art conventionally understand it during use. This is only for the convenience of describing the present invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present invention. Furthermore, the terms "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0029] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0030] Example 1 Embodiment 1 of the present invention discloses a batch temperature measurement system suitable for critical connection parts of large hydropower stations, such as... Figure 1 and Figure 2 As shown, it includes several temperature measuring pads 1, temperature measuring elements 4, temperature measuring units and monitoring systems 8.

[0031] The temperature measuring pad 1 is installed at the bolt connection of each connection part to be tested in the hydropower station. The temperature measuring pad 1 includes a pad crimping part 2, a tubular part 3 and a temperature measuring element 4. The pad crimping part 2 is tightly fitted to the bolt. The tubular part 3 is suspended around the pad crimping part 2 and does not contact the bolt. The temperature measuring element 4 is located inside the tubular part 3. In a preferred embodiment, the gasket pressing portion 2 of the temperature measuring gasket 1 and the tubular portion 3 are integrally formed, and the axis of the tubular portion 3 is arranged parallel to the axis of the gasket pressing portion 2.

[0032] In a preferred embodiment, the temperature sensing element 4 is a temperature sensing platinum resistance thermometer, which is disposed inside the tubular portion 3 and is insulated from the tubular portion 3. In a preferred embodiment, the temperature measuring pad 1 is made of metal, and the temperature measuring platinum resistance thermometer obtains the temperature of the bolt connection through the metal thermal conduction of the pad pressing part 2.

[0033] The temperature measuring pad 1 also includes a platinum resistance lead 5.

[0034] The temperature measuring unit includes a PLC temperature measuring module 6 and a power supply module 7. The power supply module 7 is connected to the PLC temperature measuring module 6 and is used to convert AC 220V to DC 24V and power the PLC temperature measuring module 6. The PLC temperature measuring module 6 is connected to the temperature measuring platinum resistance through the platinum resistance lead wire 5. Specifically, the platinum resistance lead 5 is led out from the end of the tubular part 3 and connected to the PLC temperature measurement module 6; the platinum resistance lead 5 of each of the temperature measuring pads 1 is respectively connected to different input channels of the PLC temperature measurement module 6. The PLC temperature measurement module 6 performs linearization processing and temperature compensation calculation on the collected resistance values, converting the resistance values ​​of the PT100 platinum resistance thermometer into standard temperature values.

[0035] In this embodiment, the temperature measuring platinum resistance is a PT100 platinum resistance, and the platinum resistance lead 5 is a three-wire lead.

[0036] The monitoring system 8 is connected to the PLC temperature measurement module 6 via the Modbus TCP communication protocol to receive and display temperature data in real time.

[0037] In a preferred embodiment, the monitoring system 8 includes an alarm module, which drives the alarm module to emit an audible and visual alarm signal when the temperature value exceeds a preset threshold.

[0038] In a preferred embodiment, the monitoring system 8 further includes a data storage unit and a processing unit. The data storage unit stores historical temperature data, and the processing unit is connected to the data storage unit to acquire the historical temperature data and generate a temperature change trend curve.

[0039] Example 2 Embodiment 2 of the present invention discloses a batch temperature measurement system suitable for key connection parts of large hydropower stations, such as... Figure 3 As shown, it includes several temperature measuring pads 1, temperature measuring elements 4, temperature measuring units and monitoring systems 8.

[0040] The temperature measuring pad 1 is installed at the bolt connection of each connection part to be tested in the hydropower station. The temperature measuring pad 1 includes a pad crimping part 2, a tubular part 3 and a temperature measuring element 4. The pad crimping part 2 is tightly fitted to the bolt. The tubular part 3 is suspended around the pad crimping part 2 and does not contact the bolt. The temperature measuring element 4 is located inside the tubular part 3. In a preferred embodiment, the gasket pressing portion 2 of the temperature measuring gasket 1 and the tubular portion 3 are integrally formed, and the axis of the tubular portion 3 is arranged parallel to the axis of the gasket pressing portion 2.

[0041] In a preferred embodiment, the temperature sensing element 4 is a temperature sensing optical fiber, the temperature sensing unit is an optical fiber temperature sensing host 9, the temperature sensing optical fiber is inserted into the tubular part 3, and one end of the fiber is connected to the optical fiber temperature sensing host 9. The monitoring system 8 is communicatively connected to the optical fiber temperature sensing host 9 to receive and display temperature data in real time.

[0042] In a preferred embodiment, the temperature measuring pad 1 is made of metal, and the temperature measuring platinum resistance thermometer obtains the temperature of the bolt connection through the metal thermal conduction of the pad pressing part 2.

[0043] In a preferred embodiment, the monitoring system 8 includes an alarm module, which drives the alarm module to emit an audible and visual alarm signal when the temperature value exceeds a preset threshold.

[0044] In a preferred embodiment, the monitoring system 8 further includes a data storage unit and a processing unit. The data storage unit stores historical temperature data, and the processing unit is connected to the data storage unit to acquire the historical temperature data and generate a temperature change trend curve.

[0045] This invention is not limited to the specific embodiments described above. The invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.

Claims

1. A batch temperature measurement system suitable for key connection parts of large hydropower stations, characterized in that, It includes several temperature measuring pads (1), which are installed at the bolt connections of the connection parts to be tested in the hydropower station. The temperature measuring pad (1) includes a pad crimping part (2), a tubular part (3) and a temperature measuring element (4). The pad crimping part (2) is tightly fitted to the bolt. The tubular part (3) is suspended around the pad crimping part (2) and does not contact the bolt. The temperature measuring element (4) is located inside the tubular part (3). A temperature measuring unit is connected to the temperature measuring pad (1) and corresponds to the temperature at the location of the temperature measuring pad (1); The monitoring system (8) is connected to the temperature measuring unit to receive and display temperature data in real time.

2. The batch temperature measurement system for key connection parts of large hydropower stations according to claim 1, characterized in that, The gasket pressing part (2) of the temperature measuring gasket (1) and the tubular part (3) are integrally formed, and the axis of the tubular part (3) is parallel to the axis of the gasket pressing part (2).

3. The batch temperature measurement system for key connection parts of large hydropower stations according to claim 2, characterized in that, The temperature measuring element (4) is a temperature measuring platinum resistance thermometer, which is disposed inside the tubular part (3) and is insulated from the tubular part (3); The temperature measuring pad (1) also includes a platinum resistance lead wire (5); The temperature measuring unit includes a PLC temperature measuring module (6) and a power supply module (7). The power supply module (7) is connected to the PLC temperature measuring module (6) to supply power to the PLC temperature measuring module (6). The PLC temperature measuring module (6) is connected to the temperature measuring platinum resistance through the platinum resistance lead wire (5) to obtain the temperature measurement data of the temperature measuring pad and calculate the temperature value based on the temperature measurement data.

4. The batch temperature measurement system for key connection parts of large hydropower stations according to claim 3, characterized in that, The temperature measuring platinum resistance is a PT100 platinum resistance, and the platinum resistance lead (5) is a three-wire lead.

5. The batch temperature measurement system for key connection parts of large hydropower stations according to claim 4, characterized in that, The platinum resistance lead (5) of each of the temperature measuring pads (1) is connected to different input channels of the PLC temperature measuring module (6).

6. The batch temperature measurement system for key connection parts of large hydropower stations according to claim 5, characterized in that, The PLC temperature measurement module (6) performs linearization processing and temperature compensation calculation on the collected resistance value, converting the resistance value of the PT100 platinum resistance into a standard temperature value.

7. The batch temperature measurement system for key connection parts of large hydropower stations according to claim 3, characterized in that, The temperature measuring pad (1) is made of metal, and the temperature measuring platinum resistance thermometer obtains the temperature of the bolt connection through the metal thermal conduction of the pad pressing part (2).

8. The batch temperature measurement system for key connection parts of large hydropower stations according to claim 2, characterized in that, The temperature measuring element (4) is a temperature measuring optical fiber, and the temperature measuring unit is an optical fiber temperature measuring host (9). The temperature measuring optical fiber is inserted into the tubular part (3), and one end of the fiber is connected to the optical fiber temperature measuring host (9). The optical fiber temperature measuring host (9) is connected to the monitoring system (8) for communication.

9. The batch temperature measurement system for key connection parts of large hydropower stations according to any one of claims 1-8, characterized in that, The monitoring system (8) includes an alarm module, which drives the alarm module to emit an audible and visual alarm signal when the temperature value exceeds a preset threshold.

10. The batch temperature measurement system for key connection parts of large hydropower stations according to claim 9, characterized in that, The monitoring system (8) further includes a data storage unit and a processing unit. The data storage unit stores historical temperature data, and the processing unit is connected to the data storage unit to acquire historical temperature data and generate a temperature change trend curve.

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