A temperature control system for a hydro-generator pit

Abstract

A kind of temperature control system of water turbine generator pit, it is related to water turbine generator technical field, including temperature measurement part, temperature acquisition module, PLC and heater, the temperature measurement part is multiple, multiple temperature measurement parts are all installed on the surface of pit, and multiple temperature measurement parts are upper layer and lower layer, and the temperature measurement part of upper layer and lower layer is evenly distributed;The signal input end of temperature acquisition module is electrically connected with multiple temperature measurement parts, and the signal output end of temperature acquisition module is electrically connected with PLC, and the control output end of PLC is electrically connected with heater;It is used to solve the problem of low stability of pit temperature detection and control process caused by traditional single temperature control instrument.

Description

Technical Field

[0001] The utility model relates to the field of hydro-generator technology, specifically to a hydro-generator pit temperature control system. Background Technology

[0002] The stability of temperature in the turbine pit of a hydropower station is crucial for the safe and reliable operation of the generating units. A stable and suitable pit temperature can ensure that all equipment is in a suitable environment even when the unit is shut down, thereby ensuring the stable operation of the unit and extending the service life of the equipment.

[0003] Currently, the temperature control method for the turbine pit in hydropower stations involves deploying temperature sensing elements inside the pit to transmit real-time temperature signals to an independently installed temperature controller. This controller has a built-in preset temperature threshold logic and outputs control signals directly to the heaters to perform start-up and shutdown operations based on this logic. However, the reliability of the entire control chain in this method depends entirely on the single hardware device of the temperature controller. Therefore, if the temperature controller fails, the heaters will not be able to respond to actual temperature changes, resulting in uncontrolled temperature in the turbine pit; or manual intervention may be required for maintenance, leading to a surge in operation and maintenance costs and safety risks to the unit.

[0004] Chinese patent CN210323918U discloses a temperature regulation device for generator pits. Temperature transmitters are installed both inside and outside the pit, which can accurately calculate the temperature deviation between the inside and outside of the pit, providing precise control. It can also automatically adjust the starting temperature value according to changes in ambient temperature to meet the needs of complex working conditions. However, the temperature transmitters used in this device are similar to temperature controllers, and they also have the problem that if the temperature transmitters fail, the heaters will not be able to respond to actual temperature changes, leading to uncontrolled temperature in the pit.

[0005] Therefore, we propose a temperature control system that can improve the stability of the pit temperature detection and control process. Utility Model Content

[0006] The purpose of this invention is to provide a temperature control system for the turbine generator pit, which solves the problem of low stability in the temperature detection and control process of the pit caused by traditional single temperature controllers.

[0007] This utility model is achieved through the following technical solution:

[0008] A temperature control system for a hydro-generator pit includes a temperature measuring unit, a temperature acquisition module, a PLC, and a heater. Multiple temperature measuring units are installed on the surface of the pit, and these units are arranged in upper and lower layers, with the upper and lower layers being evenly distributed. The signal input terminal of the temperature acquisition module is electrically connected to the multiple temperature measuring units, the signal output terminal of the temperature acquisition module is electrically connected to the PLC, and the control output terminal of the PLC is electrically connected to the heater.

[0009] Furthermore, each layer has two temperature measuring units.

[0010] Furthermore, the temperature measuring unit includes a protective tube, an intermediate plate, and temperature sensors. The protective tube is installed corresponding to the machine pit, and the intermediate plate is fixedly installed at the head end of the protective tube. The surface of the intermediate plate has multiple through holes, and a temperature sensor is inserted into each through hole. All the temperature sensors are electrically connected to the temperature acquisition module.

[0011] Furthermore, the number of through holes is set to three, and the three through holes are evenly distributed in a circle with the center of the intermediate plate as the center.

[0012] Furthermore, the wall of the through hole is fixedly provided with an elastic mounting ring for holding the temperature sensor.

[0013] Furthermore, the end of the elastic assembly ring is provided as a bevel.

[0014] Furthermore, the signal output terminals of multiple temperature sensors in the same temperature measuring unit are electrically connected to a terminal block, and the terminal block is electrically connected to the temperature acquisition module.

[0015] Furthermore, the temperature sensor is model WZP-280.

[0016] The technical solution of this utility model has at least the following advantages and beneficial effects:

[0017] This utility model discloses a temperature control system for a hydro-generator pit. By employing multiple temperature measuring units to detect the temperature of the pit, it can improve the redundancy of the temperature measuring units and avoid the problem of unstable temperature control caused by using a single temperature controller. Furthermore, since the temperature measuring units are distributed throughout the pit, the temperature of the pit can be detected comprehensively, thereby improving the accuracy of the pit temperature detection.

[0018] In addition, each temperature measuring unit is equipped with multiple temperature sensors, making the temperature data obtained by each measuring unit more accurate and further improving the accuracy of the control system in detecting the temperature of the machine pit. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the temperature measuring part of this utility model.

[0021] Reference numerals: 1. Temperature measuring unit; 11. Protective tube; 12. Intermediate plate; 13. Temperature sensor; 14. Elastic assembly ring; 2. Temperature acquisition module; 3. PLC; 4. Heater. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Example 1

[0024] like Figure 1 The temperature control system for a hydro-generator pit shown includes a temperature measuring unit 1, a temperature acquisition module 2, a PLC 3, and a heater 4. Multiple temperature measuring units 1 are installed on the surface of the pit, and are arranged in upper and lower layers with uniform distribution. This layered distribution structure allows for more accurate and comprehensive temperature detection of the entire pit, facilitating precise control of the heater 4 by the PLC 3 to regulate the temperature within the pit. It should be noted that each layer also contains... Multiple temperature measuring units 1 are used. During temperature measurement, only one of the multiple temperature measuring units 1 on each floor is performing temperature measurement, while the others are in standby mode. Only when the PLC3 determines that the temperature measurement accuracy of the operating temperature measuring unit 1 is low, making the temperature data output by that temperature measuring unit 1 unusable for temperature judgment, will another temperature measuring unit 1 on the current floor be switched to perform temperature measurement. In this way, the faulty temperature measuring unit 1 can be replaced without stopping the system. In particular, there are two temperature measuring units 1 on each floor, which can achieve redundancy function with minimal cost.

[0025] The signal input terminal of the temperature acquisition module 2 is electrically connected to multiple temperature measuring units 1, and the signal output terminal of the temperature acquisition module 2 is electrically connected to the PLC 3. The temperature acquisition module 2 is an expansion module installed on the PLC 3. The model of the temperature acquisition module 2 is Schneider BMXART0814. Through the separate design of the temperature acquisition module 2 and the temperature measuring unit 1, that is, the temperature detection step and the temperature acquisition step are separated, it can avoid the situation that the traditional single temperature controller is used. If the temperature controller fails, the heater 4 will not be able to respond to the actual temperature change, and the temperature of the pit will be out of control. The control output terminal of the PLC 3 is electrically connected to the heater 4. The PLC 3 can receive the real-time temperature data output by the temperature acquisition module 2, judge the temperature of the pit, and then compare the temperature of the pit with the preset threshold range. When the temperature of the pit is lower than the threshold range, the heater 4 is controlled to start until the temperature of the pit is within the threshold range, and then the heater 4 is turned off.

[0026] Example 2

[0027] As one embodiment, in conjunction with the appendix Figure 2 The temperature measuring unit 1 includes a protective tube 11, an intermediate plate 12, and temperature sensors 13. The protective tube 11 is installed corresponding to the machine pit, and the intermediate plate 12 is fixedly installed at the head end of the protective tube 11. The surface of the intermediate plate 12 has multiple through holes, and a temperature sensor 13 is correspondingly placed in each through hole. All temperature sensors 13 are electrically connected to the temperature acquisition module 2. The protective tube 11 is provided with an armor layer to effectively protect the temperature sensors 13 inside. The through holes of the intermediate plate 12 can define the detection positions of the multiple temperature sensors 13 to prevent them from being too close and affecting the accuracy of temperature measurement, or to prevent the temperature sensors 13 from being damaged by collision.

[0028] Furthermore, the number of through holes is set to three, and the three through holes are evenly distributed in a circle with the center of the intermediate plate 12 as the center. The evenly distributed through holes mean that the temperature sensor 13 is also distributed in this way. The three temperature sensors 13 measure simultaneously. After the temperature acquisition module 2 collects the temperature data of the three temperature sensors 13, it judges the difference between the maximum and minimum temperatures in the data set. If the difference is greater than 0.8℃, it means that the three temperature sensors 13 have failed, or that the environmental fluctuation at the temperature measuring unit 1 is large. Therefore, the temperature acquisition module 2 sends a command to the PLC 3 to switch the temperature measuring unit 1. In particular, the temperature sensor 13 is a PT100 temperature sensor 13, and the model is WZP-280.

[0029] As needed, the wall of the through hole is fixedly provided with an elastic mounting ring 14 for holding the temperature sensor 13. The elastic mounting ring 14 can strengthen the assembly strength between the temperature sensor 13 and the intermediate plate 12 and prevent the temperature sensor 13 from changing position or falling off.

[0030] In addition, the end of the elastic assembly ring 14 is set as a bevel. Since the temperature sensor 13 follows the direction from the end of the protective tube 11 to the head when passing through the through hole, the bevel can make it easier for the temperature sensor 13 to pass through the through hole, reducing the installation difficulty of the temperature sensor 13.

[0031] Specifically, the signal output terminals of multiple temperature sensors 13 of the same temperature measuring unit 1 are electrically connected to a terminal block, which is electrically connected to the temperature acquisition module 2. The terminal block can reduce the number of wires between the temperature sensors 13 and the temperature acquisition module 2, thereby effectively reducing costs when wiring over long distances and avoiding the problem of too many wires making it difficult to distinguish them.

[0032] When implementing the turbine generator pit temperature control system of this utility model, the temperature of the pit is first detected by the temperature measuring unit 1, then the temperature acquisition module 2 collects the temperature data of the temperature measuring unit 1 and transmits it to the PLC 3, and finally the PLC 3 analyzes the temperature data to determine whether the temperature in the pit needs to be adjusted, thereby controlling whether the heater 4 works.

[0033] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A temperature control system for a hydroelectric generator pit, characterized by, It includes a temperature measuring unit (1), a temperature acquisition module (2), a PLC (3) and a heater (4). There are multiple temperature measuring units (1), all of which are installed on the surface of the machine pit. The multiple temperature measuring units (1) are divided into an upper layer and a lower layer, and the temperature measuring units (1) in the upper and lower layers are evenly distributed. The signal input terminal of the temperature acquisition module (2) is electrically connected to the multiple temperature measuring units (1), the signal output terminal of the temperature acquisition module (2) is electrically connected to the PLC (3), and the control output terminal of the PLC (3) is electrically connected to the heater (4).

2. The hydrogenerator pit temperature control system according to claim 1, characterized in that: The number of temperature measuring units (1) in each layer is 2.

3. The hydrogenerator pit temperature control system of claim 1, wherein: The temperature measuring unit (1) includes a protective tube (11), an intermediate plate (12) and a temperature sensor (13). The protective tube (11) is installed in relation to the machine pit. The intermediate plate (12) is fixedly installed at the head end of the protective tube (11). The surface of the intermediate plate (12) is provided with multiple through holes. A temperature sensor (13) is inserted into each through hole. All the temperature sensors (13) are electrically connected to the temperature acquisition module (2).

4. The hydrogenerator pit temperature control system of claim 3, wherein: The number of through holes is set to three, and the three through holes are evenly distributed in a circle with the center of the intermediate plate (12) as the center.

5. The hydroelectric generator pit temperature control system of claim 3, wherein: The wall of the through hole is fixedly provided with an elastic mounting ring (14) for holding the temperature sensor (13).

6. The hydroelectric generator pit temperature control system of claim 5, wherein: The end of the elastic assembly ring (14) is set as a bevel.

7. The hydroelectric generator pit temperature control system of claim 1, wherein: The signal output terminals of multiple temperature sensors (13) of the same temperature measuring unit (1) are electrically connected to a terminal block, and the terminal block is electrically connected to the temperature acquisition module (2).

8. The hydroelectric generator pit temperature control system of claim 3, wherein: The temperature sensor (13) is model WZP-280.

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