A cable trench automatic cooling device

Abstract

The utility model relates to power facility maintenance technical field, concretely relates to a cable trench automatic cooling device, the cable trench automatic cooling device, including thermal resistance piece, intelligent control display and execution component, thermal resistance piece is used for real -time collection cable trench temperature, the inside integrated signal conversion unit, control unit and display unit of intelligent control display, and the resistance signal of intelligent control display receives from thermal resistance piece and converts into digital temperature value to resistance signal, compares digital temperature value with start -stop temperature threshold value, and again sends control signal to execution component, execution component includes several axial flow fan, is used for cooling in cable trench, the utility model has realized to the automatic, real -time monitoring and intelligent control of cable trench temperature, effectively prevents the ageing or accident of cable because of overheating, has the advantages of energy -conserving and cost -reducing, reduces manual dependence, guarantees the safe and stable operation of cable trench.

Description

Technical Field

[0001] This utility model relates to the field of power facility maintenance technology, specifically to an automatic cooling device for cable trenches. Background Technology

[0002] Cable trenches are important infrastructure for housing and laying power cables and communication cables. During operation, the cables generate heat due to the load current, which causes the temperature inside the cable trench to rise. Especially in summer or during peak electricity consumption periods, heat accumulates inside the trench. If it cannot be dissipated in time, it will cause problems such as excessively high ambient temperature, accelerated aging of cable insulation, and shortened cable life. In severe cases, it may even cause safety accidents such as fires, threatening the stable operation of the power grid.

[0003] Currently, heat dissipation and cooling of cable trenches mostly rely on natural ventilation or manual start and stop of cooling fans after manual inspection. Natural ventilation has limited effectiveness and is uncontrollable, while manual inspection is inefficient, slow to respond, and has high labor costs, making it impossible to achieve real-time and accurate temperature control. Therefore, there is an urgent need for a device that can automatically and in real-time monitor the temperature of cable trenches and start cooling equipment in a timely manner. Utility Model Content

[0004] Therefore, the purpose of this utility model is to overcome the shortcomings of the prior art and provide an automatic cooling device for cable trenches that is simple in structure, highly automated, and has a rapid response, so as to realize intelligent monitoring and efficient cooling of cable trench temperature.

[0005] In order to achieve the above-mentioned objectives of this utility model, the present utility model adopts the following technical solution:

[0006] An automatic cooling device for cable trenches, characterized in that it includes a resistance temperature detector (RTD), an intelligent control display, and an execution component, wherein:

[0007] Thermocouples include several, and several of the thermocouples are disposed in the cable trench for real-time acquisition of the temperature in the cable trench.

[0008] The intelligent control display includes a signal conversion unit, a control unit, and a display unit integrated within the display. The signal conversion unit is connected to a resistance temperature detector (RTD). After receiving a resistance signal from the RTD, the signal conversion unit converts the resistance signal into a digital temperature value and simultaneously transmits the digital temperature value to the control unit and the display unit connected to the signal conversion unit. The display unit displays the received digital temperature value. The control unit uses a built-in threshold judgment module to judge the received digital temperature value against a preset start / stop temperature threshold and sends corresponding control signals to the execution components.

[0009] The execution component includes several axial flow fans, which are installed at the ventilation openings or on the walls of the cable trench. The axial flow fans are connected to the control unit, which automatically controls the start and stop of the axial flow fans.

[0010] Furthermore, the thermal resistance element is of model PT100, and several thermal resistance elements are attached to the surface of the main cable and the trench wall area inside the cable trench for accurate sensing of ambient temperature.

[0011] Furthermore, the signal conversion unit includes a signal amplifier and an analog-to-digital converter. The signal amplifier amplifies the resistance signal transmitted from the resistance thermometer, and the analog-to-digital converter converts the amplified resistance signal into a digital temperature value and transmits the digital temperature value to the control unit and the display unit.

[0012] Furthermore, the control unit includes a microprocessor and a relay. After the microprocessor reads the digital temperature value from the analog-to-digital converter, it performs a threshold judgment using a built-in threshold judgment module and sends a control signal to the relay to control the opening and closing of the relay. On this basis, the relay is connected in series in the power supply circuit of the axial flow fan, and the opening and closing of the relay controls the start and stop of the axial flow fan.

[0013] Furthermore, the display unit includes a display screen, which is located outside the intelligent control display and is used to receive and display digital temperature values ​​from the analog-to-digital converter.

[0014] In addition, the intelligent control display is equipped with control buttons on the outside for setting the start and stop temperature thresholds.

[0015] Furthermore, the thermal resistance element is connected to the input terminal of the intelligent control display via a high-temperature resistant and moisture-proof shielded wire.

[0016] Furthermore, the start-stop temperature threshold includes the fan start-up temperature value and the fan stop temperature value, and the fan start-up temperature value is greater than the fan stop temperature value.

[0017] The beneficial effects of this utility model are as follows:

[0018] (1) This utility model realizes the full-process automated management of cable trench cooling without manual intervention. It has a fast response speed and high control accuracy, and can stabilize the temperature of the cable trench within the set safe range. It can effectively prevent the cable from being damaged by excessive temperature and reduce the risk of fire caused by cable overheating, thus ensuring the safe and stable operation of the power system.

[0019] (2) This utility model achieves automatic start and stop of the fan by setting the start and stop temperature threshold, which avoids the waste of electricity caused by the long-term uninterrupted operation of the fan and has a significant energy-saving effect. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the specific structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the internal structure of the intelligent control display described in this utility model. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] like Figure 1 As shown, this utility model provides an automatic cooling device for cable trenches, including a thermal resistance element, an intelligent control display 2, and an execution component.

[0025] The thermal resistance element is model PT100, and several PT100 thermal resistance elements 1 are attached to the cable surface and hot spots on the trench wall where temperature monitoring is required. The temperature inside the cable trench is collected in real time and converted into a resistance signal. The PT100 thermal resistance elements 1 are connected to the input terminal of the intelligent control display 2 through a high-temperature resistant and moisture-proof shielded signal cable, and the resistance signal of the PT100 thermal resistance elements 1 is transmitted to the intelligent control display 2 for processing.

[0026] The intelligent control display 2 is installed inside the cable trench inlet cover or in a nearby distribution box. The intelligent control display 2 integrates a signal conversion unit, a control unit, and a display unit.

[0027] like Figure 2 As shown, the signal conversion unit includes a signal amplifier 201 and an analog-to-digital converter 202. The signal amplifier 201 amplifies the resistance signal transmitted from the PT100 thermal resistance patch 1, and the analog-to-digital converter 202 converts the amplified resistance signal into a digital temperature value and transmits the digital temperature value to the control unit and the display unit.

[0028] The control unit includes a microprocessor 203 and a relay 204. After reading the digital temperature value from the analog-to-digital converter 202, the microprocessor 203 performs a threshold judgment using a built-in threshold judgment module and sends a control signal to the relay 204 to control the opening and closing of the relay 204. The relay 204 then controls the execution component. Specifically, when the microprocessor 203 determines that the current temperature exceeds the fan start-up temperature value, it controls the relay 204 to close. When the microprocessor 203 detects that the temperature is lower than the fan stop-up temperature value, it controls the relay 204 to open.

[0029] The display unit includes a display screen 205, which is located outside the intelligent control display 2. It receives and displays digital temperature values ​​from the analog-to-digital converter 202, making it convenient for staff to check the temperature status.

[0030] The intelligent control display 2 is also equipped with control buttons on the outside for setting the start and stop temperature thresholds. The start and stop temperature thresholds include the fan start temperature value and the fan stop temperature value, and the fan start temperature value is greater than the fan stop temperature value. The operator can set the fan start temperature and fan stop temperature through the control buttons.

[0031] The execution component includes several axial flow fans 3, which are installed in the ventilation openings and walls of the cable trench. The live wire of the axial flow fan 3 is connected in series to the normally open contact of the relay 204 inside the intelligent control display 2. When the relay 204 is energized, the power supply of the axial flow fan 3 is turned on, and the fan starts to work, sending cold air into the trench or extracting hot air. When the relay 204 is de-energized, the power supply of the axial flow fan 3 is turned off, and cooling stops.

[0032] The working process of this utility model is as follows: After the system is powered on and initialized, the start and stop temperature thresholds are set through the control buttons on the intelligent control display 2. The PT100 RTD patch 1 starts to collect the temperature inside the cable trench. The intelligent control display 2 receives the resistance signal of the PT100 RTD patch 1, converts it into a digital temperature value, and displays it in real time on the display screen 205. The digital temperature value is compared with the start and stop temperature thresholds. When the digital temperature value is greater than the fan start temperature value, the axial flow fan 3 automatically turns on to cool the inside of the cable trench. When the collected temperature inside the cable trench is less than the fan stop temperature value, the axial flow fan 3 automatically turns off and returns to continue to monitor the temperature inside the cable trench in real time, continuously ensuring that the cable trench is in a suitable temperature environment.

[0033] The above are merely embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. An automatic cooling device for cable trenches, characterized in that, Includes a resistance temperature detector (RTD), a smart control display, and actuators, wherein: Thermocouples include several, and several of the thermocouples are disposed in the cable trench for real-time acquisition of the temperature in the cable trench. The intelligent control display includes a signal conversion unit, a control unit, and a display unit integrated within the display. The signal conversion unit is connected to a resistance temperature detector (RTD). After receiving a resistance signal from the RTD, the signal conversion unit converts the resistance signal into a digital temperature value and simultaneously transmits the digital temperature value to the control unit and the display unit connected to the signal conversion unit. The display unit displays the received digital temperature value. The control unit uses a built-in threshold judgment module to judge the received digital temperature value against a preset start / stop temperature threshold and sends corresponding control signals to the execution components. The execution component includes several axial flow fans, which are installed at the ventilation openings or on the walls of the cable trench. The axial flow fans are connected to the control unit, which automatically controls the start and stop of the axial flow fans.

2. The automatic cooling device for cable trenches according to claim 1, characterized in that, The thermal resistance element is model PT100, and several thermal resistance elements are attached to the surface of the main cable and the trench wall area in the cable trench for accurate sensing of ambient temperature.

3. The automatic cooling device for cable trenches according to claim 1, characterized in that, The signal conversion unit includes a signal amplifier and an analog-to-digital converter. The signal amplifier amplifies the resistance signal transmitted from the resistance thermometer, and the analog-to-digital converter converts the amplified resistance signal into a digital temperature value, which is then transmitted to the control unit and the display unit.

4. The automatic cooling device for cable trenches according to claim 3, characterized in that, The control unit includes a microprocessor and a relay. After the microprocessor reads the digital temperature value from the analog-to-digital converter, it performs a threshold judgment using a built-in threshold judgment module and sends a control signal to the relay to control the opening and closing of the relay. In addition, the relay is connected in series in the power supply circuit of the axial flow fan, and the opening and closing of the relay controls the start and stop of the axial flow fan.

5. The automatic cooling device for cable trenches according to claim 4, characterized in that, The display unit includes a display screen, which is located outside the intelligent control display and is used to receive and display digital temperature values ​​from the analog-to-digital converter. In addition, the intelligent control display is equipped with control buttons on the outside for setting the start and stop temperature thresholds.

6. The automatic cooling device for cable trenches according to claim 1, characterized in that, The resistance temperature detector (RTD) element is connected to the input terminal of the intelligent control display via a high-temperature resistant and moisture-proof shielded wire.

7. The automatic cooling device for cable trenches according to claim 5, characterized in that, The start-stop temperature thresholds include the fan start-up temperature and the fan stop temperature, and the fan start-up temperature is greater than the fan stop temperature.

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