Rotating speed probe cooling equipment and system and steam turbine

Abstract

The invention relates to a rotating speed probe cooling device and system and a steam turbine, relates to the technical field of steam turbines, and can reduce the environment temperature of a rotating speed probe. The rotating speed probe cooling equipment comprises a control module and at least two cooling devices, wherein the at least two cooling devices comprise a first cooling device arranged on the first side of a rotating speed probe in a steam turbine and a second cooling device arranged on the second side of the rotating speed probe; and the control module is used for controlling the operation states of the first cooling device, the second cooling device and an axial flow fan in the steam turbine according to the environment temperature of the rotating speed probe, so that the environment temperature of the rotating speed probe is reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of steam turbines, and in particular to a speed probe cooling device, a system and a steam turbine. Background Art

[0002] At present, the maximum temperature that the #2W speed probe of the steam turbine can withstand is 120°C. However, during the actual operation of the steam turbine, the ambient temperature of the speed probe often exceeds the maximum temperature it can withstand, shortening the service life of the speed probe and posing a great hidden danger to the safe operation of the steam turbine. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a speed probe cooling device, system and steam turbine.

[0004] In order to achieve the above-mentioned object, in a first aspect, the present disclosure provides a speed probe cooling device, comprising: a control module and at least two cooling devices, the at least two cooling devices comprising a first cooling device arranged at a first side of a speed probe in a steam turbine and a second cooling device arranged at a second side of the speed probe; The control module is used to control the operating states of the first cooling device, the second cooling device and the axial flow fan in the steam turbine according to the ambient temperature of the speed probe, thereby reducing the ambient temperature of the speed probe.

[0005] In a second aspect, the present disclosure provides a speed probe cooling system, comprising the speed probe cooling device described in the first aspect.

[0006] In a third aspect, the present disclosure provides a steam turbine, comprising the speed probe cooling system described in the second aspect.

[0007] Through the above technical scheme, the speed probe cooling equipment includes a control module and at least two cooling devices respectively arranged on the first side and the second side of the speed probe. The control module controls the two cooling devices and the operating status of the axial flow fan in the turbine according to the ambient temperature of the speed probe, thereby reducing the ambient temperature of the speed probe, avoiding the shortening of the life of the speed probe due to the excessively high ambient temperature of the speed probe, and reducing the safety hazards of the steam turbine during operation.

[0008] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1is a schematic diagram showing a rotation speed probe cooling device according to an exemplary embodiment of the present disclosure.

[0010] Figure 2 is an electrical schematic diagram of a rotation speed probe cooling device according to an exemplary embodiment of the present disclosure.

[0011] Figure 3 1 is a diagram showing the setting of measurement points of a rotation speed probe cooling device according to an exemplary embodiment of the present disclosure.

[0012] Figure 4 Detailed description is given of an electrical circuit diagram of a rotation speed probe cooling device according to an exemplary embodiment of the present disclosure.

[0013] Figure 5 Detailed description is given of a terminal connection diagram of a rotation speed probe cooling device according to an exemplary embodiment of the present disclosure.

[0014] Figure 6a~Figure 6c The present invention is a user interface of a display of a rotation speed probe cooling system according to an exemplary embodiment of the present disclosure.

[0015] Description of Reference Numerals 1 control module, 2 cooling device, 3 speed probe, 4 axial flow fan, 5 speed probe fixing bracket, 21 temperature element, 22 vortex cooler, 23 manual valve, 221 solenoid valve, 222 vortex tube. DETAILED DESCRIPTION

[0016] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0017] It should be noted that all actions of acquiring signals, information or data in the present disclosure are carried out in compliance with the relevant data protection laws and policies of the country where the device is located and with the authorization given by the owner of the corresponding device.

[0018] It is worth noting that in the supercritical unit, the #2 bearing of the SAIC model steam turbine is located in the middle of the high and medium pressure cylinders, and is affected by the wear and leakage of the steam seal at the medium pressure end and the poor thermal radiation of the cylinder end insulation. The speed probe in the steam turbine is a device used to measure the speed of the steam turbine. It is usually installed on the driving shaft of the steam turbine, that is, near the bearing shaft, to ensure that the rotation speed of the steam turbine can be accurately monitored.

[0019] The inventors found that the maximum temperature that the speed probe of turbine #2 can withstand is 120°C, but during the actual operation of the turbine, the ambient temperature of the speed probe often exceeds the maximum temperature it can withstand, shortening the service life of the speed probe and posing a great hidden danger to the safe operation of the turbine.

[0020] In view of this, the present disclosure provides a speed probe cooling device, a system and a steam turbine, which can reduce the ambient temperature of the speed probe.

[0021] Figure 1 FIG. 1 is a schematic diagram of a speed probe cooling device according to an exemplary embodiment of the present disclosure. Figure 1 As shown, the speed probe cooling device may include: a control module 1 and at least two cooling devices 2, the at least two cooling devices 2 including a first cooling device arranged on a first side of a speed probe 3 in a steam turbine and a second cooling device arranged on a second side of the speed probe 3; The control module 1 is used to control the operating states of the first cooling device, the second cooling device and the axial flow fan 4 in the steam turbine according to the ambient temperature of the speed probe 3 , thereby reducing the ambient temperature of the speed probe 3 .

[0022] It is worth noting that the number or type of cooling devices can be increased or decreased according to actual needs to meet the requirements of different application scenarios. The embodiment of the present disclosure is described with two sets of cooling devices.

[0023] For example, Figure 1 As shown, multiple speed probes in the steam turbine are divided into two groups and arranged on the left and right sides respectively, and fixed by the speed probe fixing bracket 5. According to the left and right arrangement of the steam turbine speed probe, two sets of cooling devices are arranged on the left and right sides respectively. Both sets of cooling devices 2 are connected to the control module 1 for communication. The control module 1 controls the operating state of the two axial flow fans of the two cooling devices according to the ambient temperature of the speed probe 3, thereby reducing the ambient temperature of the speed probe 3.

[0024] The control module 1 may be a PLC controller, which is not limited in the present disclosure.

[0025] In the embodiment of the present disclosure, the control module performs intelligent adjustments according to the ambient temperature of the speed probe. Under the joint action of two cooling devices located on both sides of the speed probe, the ambient temperature of the speed probe can be effectively reduced. While ensuring that the speed probe operates within the optimal temperature range, energy waste is avoided and precise temperature control is achieved. The control module can also adjust the operating status of the cooling device and the axial flow fan in the turbine at the same time according to actual needs, and can adapt to different working environments and load conditions, thereby improving the adaptability of the speed probe cooling equipment.

[0026] In order to facilitate those skilled in the art to better understand the speed probe cooling device provided by the present disclosure, the speed probe cooling device is described in detail below.

[0027] In a feasible implementation manner, the cooling device 2 includes a temperature element 21 and an eddy current cooler 22, and the temperature element 21 and the eddy current cooler 22 are respectively connected to the control module 1 for communication; The temperature element 21 is used to collect the ambient temperature of the speed probe 3; The control module 1 is used to control the vortex cooler 22 of the first cooling device to be in a normally open state according to the ambient temperature, and to control the operating state of the vortex cooler and / or the axial flow fan 4 of the second cooling device.

[0028] It is worth mentioning that the vortex cooler, as an efficient and reliable cooling device, has the advantages of no moving parts, simple and cheap, and easy to control. It can convert compressed air into cold air flow and hot air flow, providing a feasible solution for lowering the ambient temperature.

[0029] In the embodiment of the present disclosure, a suitable type of vortex cooler is selected according to factors such as cooling power, air flow, temperature range, etc., to ensure that the selected vortex cooler can meet the cooling requirements on site. At the same time, a vortex tube made of corrosion-resistant and food-grade stainless steel is selected to ensure the reliability and durability of the vortex cooler in harsh environments such as high temperature and high humidity.

[0030] In a feasible implementation, the temperature element 21 may include one of an infrared temperature sensor, an optical fiber temperature sensor, a thermal resistor, and a thermocouple.

[0031] It is worth noting that the temperature element is used to monitor the ambient temperature around the speed probe in real time, so a high-precision and stable sensor should be selected to accurately reflect the temperature changes on site. The temperature element in the embodiment of the present disclosure can be a PT100 temperature sensor.

[0032] In a feasible embodiment, the first cooling device includes a first temperature element and a first vortex cooler, and the second cooling device includes a second temperature element and a second vortex cooler; The control module 1 is used to control the first vortex cooler to be in a normally open state according to the first ambient temperature collected by the first temperature element, and to control the operating state of the second vortex cooler and / or the axial fan 4 according to the second ambient temperature collected by the second temperature element.

[0033] For example, Figure 1As shown, both cooling devices 2 are composed of a temperature element 21, a vortex cooler 22 and a manual valve 23. The manual valve 23 is used to connect or disconnect the compressed air and the vortex cooler 22. The cold air end of the vortex cooler 22 faces the speed probe 3. The temperature element 21 is arranged between the vortex cooler 22 and the speed probe 3. The temperature element 21 monitors the ambient temperature of the speed probe 3 in real time, and sends it to the control module 1 through wireless or wired communication. The control module 1 controls the vortex cooler 22 of one cooling device 2 to be in a normally open state to provide basic cooling capacity, and controls the operating state of the vortex cooler 22 and the axial flow fan 4 of the other cooling device according to the ambient temperature, thereby flexibly cooling the temperature.

[0034] In the embodiment of the present disclosure, temperature data is accurately obtained through a temperature element and transmitted to a control module. The control module realizes automatic control of the vortex cooler and / or axial cooling fan in the two cooling devices through logical judgment, thereby reducing the ambient temperature of the speed probe and ensuring that the #2 watt ambient temperature is always kept within a safe range.

[0035] In a feasible embodiment, the control module 1 is used to control the second vortex cooler to be in an on state when the second ambient temperature is greater than a first temperature threshold, and to control the second vortex cooler to be in a off state when the second ambient temperature is less than a second temperature threshold, and the second temperature threshold is less than the first temperature threshold.

[0036] It is worth noting that the first temperature threshold and the second temperature threshold can be preset according to the safe operating temperature range of the rotation speed probe, and the present disclosure does not limit this.

[0037] For example, when the second ambient temperature is greater than 66° C., the control module 1 controls the second vortex cooler to start working, and continuously monitors the ambient temperature of the speed probe until the ambient temperature is less than 64° C., and then controls the second vortex cooler to stop working.

[0038] In the embodiment of the present disclosure, the start and stop of the vortex cooler is based on the real-time monitoring result of the ambient temperature. This on-demand cooling method can save energy to the maximum extent. When the ambient temperature does not require cooling, the vortex cooler stops working, avoiding unnecessary energy consumption. In addition, the start and stop of the vortex cooler is combined with temperature monitoring to realize automatic control of the system, which helps to reduce manual intervention and improve the operating efficiency and reliability of the steam turbine.

[0039] In a feasible embodiment, the control module 1 is used to control the solenoid valve 221 in the second vortex cooler to open when the second ambient temperature is greater than the first temperature threshold, so that the vortex tube 222 in the second vortex cooler converts compressed air into cold air flow, and sprays the cold air flow onto the corresponding speed probe 3 through the cold air end of the second vortex cooler.

[0040] For example, the control module 1 is used to control the solenoid valve 221 to open when the second ambient temperature is greater than 73°C, and the compressed air flows into the vortex tube 222 in the second vortex cooler through the solenoid valve 221. The vortex tube 222 converts the compressed air into a cold air flow, and sprays the cold air flow onto the corresponding speed probe 3 through the cold air end of the second vortex cooler, thereby reducing the ambient temperature of the speed probe 3.

[0041] In a feasible embodiment, the control module 1 is used to control the axial flow fan 4 to be in an on state when the second ambient temperature is greater than a third temperature threshold, and to control the axial flow fan 4 to be in an off state when the second ambient temperature is less than a fourth temperature threshold, and the fourth temperature threshold is less than the third temperature threshold and greater than the first temperature threshold.

[0042] It is worth noting that the third temperature threshold and the second temperature threshold can also be preset according to the safe operating temperature range of the speed probe, and the present disclosure does not limit this.

[0043] For example, when the second ambient temperature is greater than 73° C., the control module 1 controls the axial flow fan to be in an on state, and continuously monitors the ambient temperature of the speed probe until the ambient temperature is less than 70° C., and then controls the axial flow fan to be in an off state.

[0044] Specifically, Figure 2 As shown, the electrical operating principle of two axial fans can include: I. Power supply: Three-phase AC power supply (AC380V 50Hz) is connected and protected and controlled by circuit breaker (QF01) and isolating switch (QF03).

[0045] II. Main circuit: Two axial flow fans (1# axial flow fan and 2# axial flow fan) are connected to the three-phase power supply through contactors (KM01 and KM02). The contactors are controlled by PLC to start and stop the fans.

[0046] III. Control circuit: PLC controls the coils of contactors (KM01, KM02) through output modules (QF01, QF02, QF03), thereby controlling the operation of the fan.

[0047] The input module of the PLC receives signals from buttons (R01, R02) and thermal relays (FR01, FR02) for starting and stopping the fan and for overload protection.

[0048] Among them, PLC is the control center of the entire system, responsible for receiving input signals, processing logic and outputting control signals.

[0049] IV. Protection device: Thermal relays (FR01, FR02) are used for motor overload protection. When the motor current exceeds the set value, the thermal relay will disconnect the circuit to protect the motor.

[0050] Circuit breakers (QF01) and disconnectors (QF03) are used for short circuit and overload protection of circuits.

[0051] V. Power indicator and power conversion: The power indicator is used to display the power status to ensure normal power supply of the system. DC24V power supply module (NDR-100-24) is used to provide stable DC power supply for PLC and HMI.

[0052] The disclosed embodiment of the present invention monitors the ambient temperature of the speed probe while controlling the eddy current cooler to cool the speed probe, and when the ambient temperature is greater than 73°C, controls the axial flow fan to start in time, quickly removes the heat around the speed probe, and quickly reduces the ambient temperature of the speed probe. This efficient heat dissipation capability helps to ensure that the probe operates within an appropriate temperature range and avoids performance degradation or damage due to overheating. By continuously monitoring the ambient temperature and shutting down the axial flow fan when the temperature drops below 70°C, precise temperature control can be further achieved to avoid unnecessary energy consumption and noise. The start and shut down of the axial flow fan is based on the real-time monitoring results of the ambient temperature. This on-demand cooling method can maximize energy savings. When the ambient temperature does not require cooling, the axial flow fan stops working to avoid unnecessary energy consumption and carbon emissions. In addition, axial flow fans usually have a high energy efficiency ratio and can maintain a low energy consumption level while providing effective heat dissipation.

[0053] It should be understood that the above-mentioned speed probe cooling equipment can effectively reduce the ambient temperature of the important protection measuring points on both sides of the turbine #2, thereby avoiding speed probe and shaft displacement failures caused by high temperature, ensuring the safe and stable operation of the unit. It reduces downtime accidents caused by equipment failures, reduces safety risks in the production process, and provides a strong guarantee for the safe production of enterprises.

[0054] It is worth noting that if Figure 3As shown in the figure, the important protection measurement points involved on both sides of turbine #2 are as follows: A Siemens S7-200 series CPU module is used as the PLC, and the specific model is 6ES7 212-1AB23-0XB8. The PLC is powered by 24V+ and M (ground) terminals. The input terminals of the PLC (I0.0 to I0.7 and I1.0 to I1.7) are used to receive signals from various sensors and switches. The signal can be a binary switch quantity to indicate the device status or alarm. The output terminals of the PLC (Q0.0 to Q0.7) are used to control external devices such as relays, contactors or solenoid valves.

[0055] Figure 3 The figure shows the fault signals of two speed probes, which are connected to the input terminals I0.1 and I0.2 of the PLC respectively. The fault signal carries the status information of the monitored speed probe. If the speed probe fails, the corresponding input terminal will receive the fault signal.

[0056] Two temperature sensors (PT100) are connected to analog input terminals AI0 and AI1 respectively. The two temperature sensors are used to measure the ambient temperature of the speed probe and convert the analog signal into a digital signal that can be processed by the PLC. The indicator light is used to provide a visual alarm and the buzzer is used to provide an audible alarm. The indicator light and buzzer are controlled by the output terminal of the PLC. The spare terminal is not used in the current configuration, but can be used for future expansion or additional input / output requirements.

[0057] The numbers of the wiring terminals correspond to the input and output terminals of the PLC and are used for field wiring. The PLC is connected to the turbine speed probe and other sensors and actuators through its input and output terminals to monitor and control the ambient temperature of the speed probe. Through the program logic inside the PLC, the signal of the speed probe can be processed to realize fault detection, alarm and corresponding control actions.

[0058] Based on the same inventive concept, the present disclosure provides a rotation speed probe cooling system, including the above-mentioned rotation speed probe cooling device.

[0059] It is worth noting that if Figure 4 As shown in the figure, when the speed probe cooling device is used in the steam turbine system, the electrical circuit of the steam turbine system includes: I. Power supply part: includes two-phase AC power supply (L2 and N2), which is the working voltage of the electrical circuit.

[0060] II. Contactor and relay: KM01 and KM02 are two contactor coils, which are used to control the operation of 1# axial flow fan and 2# axial flow fan respectively. The on and off of the contactor coils are controlled by PLC. FR01 and FR02 are thermal relays, which are used for overload protection of the motor. They are connected in series with the contactor coils. When the motor is overloaded, the thermal relay will disconnect the circuit to protect the motor.

[0061] III. PLC output points: KA01, KA02, KA03, KA04, KA05, KA06 and KA08 are PLC output points, which are used to control the coils of contactors and solenoid valves. These output points are controlled by the internal logic of PLC to achieve automatic operation.

[0062] IV. Solenoid valve: Solenoid valves (611, 613, 615, 617) are controlled by PLC and are used to control the flow of compressed air. The solenoid valve controls the vortex cooler to start or stop working to achieve cooling of the speed probe.

[0063] V indicator light and buzzer: indicator light, used to display the operating status of axial flow fan #1 and axial flow fan #2. The buzzer is used to send out an alarm signal and may be activated when the system fails or requires maintenance.

[0064] In summary, the electrical circuit controlled by PLC includes components such as power supply, contactor, thermal relay, PLC output, solenoid valve, indicator light and buzzer. Through the logic programming of PLC, the ambient temperature of the speed probe can be automatically reduced.

[0065] It is worth noting that if Figure 5 As shown, when the speed probe cooling device is used in the steam turbine system, the terminal wiring methods include: the connection of three-phase AC power supply (L1, L2, L3) and neutral line (N) and protective ground line (PE), and the total power line specification is 4×2.5mm². The power line specifications of 1# axial flow fan and 2# axial flow fan are 4×1.5mm², which are connected to U1, V1, W1 and U2, V2, W2 respectively. The solenoid valves of 1# system and 2# system are connected through 2×1mm² cables respectively. Each system has two solenoid valves, marked as 613, 615 and 617 respectively. 1# and 2# temperature sensors are connected using 3×0.3mm² PT100 special cables, connected to A1, B1 and A2, B2 respectively. The terminal row is numbered (Terminal 01 to 29), and each terminal corresponds to different wiring, such as power line, fan, solenoid valve and temperature sensor.

[0066] In a feasible implementation manner, the speed probe cooling system may further include a display, wherein the display is communicatively connected to the control module 1 in the speed probe cooling device; The display is used to display the ambient temperature of the speed probe, the first cooling device, the second cooling device and the operating status of the axial flow fan in the steam turbine.

[0067] It is worth noting that the display may be a human-machine interface, which is not limited in the present disclosure.

[0068] For example, Figure 2 As shown, the HMI (human-machine interface) is powered by a 24V DC power supply and connected to the PLC to display system status and operation control. Specifically, the on-site parameter setting interface of the speed probe cooling system is as follows Figure 6a As shown, the operation mode setting interface is as follows Figure 6b As shown, the device operation status display interface is as follows Figure 6c shown.

[0069] In the disclosed embodiment, intelligent adjustment is performed according to the ambient temperature of the speed probe. Under the joint action of two cooling devices respectively located on both sides of the speed probe, the ambient temperature of the speed probe can be effectively reduced. While ensuring that the speed probe works within the optimal temperature range, energy waste is avoided and precise temperature control is achieved. The control module can simultaneously adjust the operating status of the cooling device and the axial flow fan in the turbine according to actual needs, and can adapt to different working environments and load conditions, thereby improving the adaptability of the speed probe cooling equipment.

[0070] Based on the same inventive concept, the present disclosure also provides a steam turbine, comprising the above-mentioned speed probe cooling system.

[0071] In the embodiment of the present disclosure, the control module performs intelligent adjustments according to the ambient temperature of the speed probe. Under the joint action of two cooling devices located on both sides of the speed probe, the ambient temperature of the speed probe can be effectively reduced. While ensuring that the speed probe operates within the optimal temperature range, energy waste is avoided and precise temperature control is achieved. The control module can also adjust the operating status of the cooling device and the axial flow fan in the turbine at the same time according to actual needs, and can adapt to different working environments and load conditions, thereby improving the adaptability of the speed probe cooling equipment.

[0072] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0073] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0074] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A speed probe cooling device, characterized in that: include: A control module and at least two cooling devices, the at least two cooling devices comprising a first cooling device arranged on a first side of a speed probe in the steam turbine and a second cooling device arranged on a second side of the speed probe; The control module is used to control the operating states of the first cooling device, the second cooling device and the axial flow fan in the steam turbine according to the ambient temperature of the speed probe, thereby reducing the ambient temperature of the speed probe.

2. The speed probe cooling device according to claim 1, characterized in that: The cooling device comprises a temperature element and an eddy current cooler, wherein the temperature element and the eddy current cooler are respectively connected to the control module for communication; The temperature element is used to collect the ambient temperature of the speed probe; The control module is used to control the vortex cooler of the first cooling device to be in a normally open state according to the ambient temperature, and to control the operating state of the vortex cooler and / or the axial flow fan of the second cooling device.

3. The speed probe cooling device according to claim 2, characterized in that: The first cooling device comprises a first temperature element and a first vortex cooler, and the second cooling device comprises a second temperature element and a second vortex cooler; The control module is used to control the first vortex cooler to be in a normally open state according to the first ambient temperature collected by the first temperature element, and to control the operating state of the second vortex cooler and / or the axial fan according to the second ambient temperature collected by the second temperature element.

4. The speed probe cooling device according to claim 3, characterized in that: The control module is used to control the second vortex cooler to be in an open state when the second ambient temperature is greater than a first temperature threshold, and to control the second vortex cooler to be in a closed state when the second ambient temperature is less than a second temperature threshold, and the second temperature threshold is less than the first temperature threshold.

5. The speed probe cooling device according to claim 4, characterized in that: The control module is used to control the solenoid valve in the second vortex cooler to open when the second ambient temperature is greater than the first temperature threshold, so that the vortex tube in the second vortex cooler converts compressed air into cold air flow, and sprays the cold air flow onto the corresponding speed probe through the cold air end of the second vortex cooler.

6. The speed probe cooling device according to claim 3, characterized in that: The control module is used to control the axial flow fan to be in an on state when the second ambient temperature is greater than a third temperature threshold, and to control the axial flow fan to be in an off state when the second ambient temperature is less than a fourth temperature threshold, and the fourth temperature threshold is less than the third temperature threshold and greater than the first temperature threshold.

7. The speed probe cooling device according to claim 2, characterized in that: The temperature element includes one of an infrared temperature sensor, a fiber optic temperature sensor, a thermal resistor, and a thermocouple.

8. A speed probe cooling system, characterized in that: The invention comprises a rotation speed probe cooling device as described in any one of claims 1 to 7.

9. The speed probe cooling system according to claim 8, characterized in that: Also includes a display, the display is communicatively connected to the control module in the speed probe cooling device; The display is used to display the ambient temperature of the speed probe, the first cooling device, the second cooling device and the operating status of the axial flow fan in the steam turbine.

10. A steam turbine, characterized in that: The invention comprises a rotation speed probe cooling system as described in any one of claims 8 or 9.

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