Cable trench ventilation structure

Abstract

The utility model belongs to the technical field of cables, and particularly provides a cable trench ventilation structure which comprises a cable trench and a cover plate, the top of the cable trench is provided with the cover plate, two sides of the cable trench are respectively provided with an air inlet and an air outlet, the air inlet is connected with the cable trench through an air inlet channel, and the air outlet is connected with the cable trench through an air outlet channel. The air inlet is connected with a cable channel through an air inlet duct, the air outlet is connected with a cable channel through an air outlet duct, an air inlet fan is arranged at the intersection of the air inlet and the air inlet duct, an exhaust fan is arranged at the intersection of the air outlet and the air outlet duct, and the air inlet fan and the exhaust fan are connected with a multi-gear switching circuit. The cable trench ventilation structure provided by the utility model has the technical effects that the cable trench ventilation part is arranged, so that the temperature and humidity in the cable trench are improved, and the cable is protected to be in a good working environment.

Description

Technical Field

[0001] The utility model relates to the field of cables, in particular to a ventilation structure for a cable trench. Background Art

[0002] In a conventional substation, most cables are placed in an outdoor cable trench. When the temperature or humidity in the cable trench is too high or too low, the movable cover plate of the cable trench needs to be opened for ventilation.

[0003] Since most of the cable trenches in substations have movable cover plates, the sealing performance between the cover plates is poor. Especially in rainy and snowy seasons, rainwater and snowmelt seep into the cable trench through the gaps, making the humidity in the cable trench relatively high. If ventilation cannot be carried out in time, the cable insulation is easily damaged. Moreover, in summer, when the temperature is high, if ventilation is not carried out in time, it is very easy to cause safety accidents.

[0004] Therefore, this application proposes a ventilation structure for a cable trench to keep the temperature and humidity in the cable trench appropriate and extend the service life of the cable. Summary of the Invention

[0005] In order to make up for the deficiencies of the prior art and solve the technical problems proposed in the background art.

[0006] The technical solution adopted by the utility model to solve its technical problems is: a ventilation structure for a cable trench, including a cable trench and a cover plate. The cover plate is arranged on the top of the cable trench. An air inlet and an air outlet are respectively arranged on both sides of the cable trench. The air inlet is connected to the cable trench through an air inlet duct, and the air outlet is connected to the cable trench through an air outlet duct. An intake fan is arranged at the intersection of the air inlet and the air inlet duct, and an exhaust fan is arranged at the intersection of the air outlet and the air outlet duct. The intake fan and the exhaust fan are connected to a multi-speed switching circuit.

[0007] In a preferred embodiment of the utility model, it can be further configured that: temperature sensors and humidity sensors are respectively arranged on the side walls of the cable trench, and the temperature sensors and the humidity sensors are respectively connected to the multi-speed switching circuit.

[0008] In a preferred embodiment, the present utility model can be further configured as follows: The multi - gear switching circuit includes a temperature sensor, a first voltage comparator U1, a second voltage comparator U2, a first to sixth resistor, a first zener diode D1, a second zener diode D2, a first relay, a first relay switch KA1, a second relay, a second relay switch KA2, an AND gate, an XOR gate, a first triode VT1, a second triode VT2, and a fan. The positive input terminal of the first voltage comparator U1 is connected to the temperature sensor, the negative input terminal is connected to the first resistor R1 and the cathode of the first zener diode D1, and the output terminal is connected to the input terminal of the XOR gate. The positive input terminal of the second voltage comparator U2 is connected to a humidity sensor, the negative input terminal is connected to the second resistor R2 and the cathode of the second zener diode, and the output terminal is connected to the input terminal of the XOR gate. The temperature sensor and the humidity sensor are respectively connected to the input terminals of the AND gate. The output terminal of the AND gate is connected to a third resistor R3, and the third resistor R3 is connected to the base of the first triode VT1. The collector of the first triode VT1 is connected to the power supply through the first relay. The output terminal of the XOR gate is connected to a fourth resistor R4, and the fourth resistor R4 is connected to the base of the second triode VT2. The collector of the second triode is connected to the power supply through the second relay. One end of the fan is connected to the negative pole of the power supply, and the other end is connected in parallel with the fifth resistor R5, the sixth resistor R6, and the fifth resistor R5. A first relay switch KA1 is connected between the sixth resistor R6 and the power supply, and a first relay switch KA2 is connected between the fifth resistor R5 and the power supply. The anodes of the first zener diode D1, the second zener diode D2, the emitters of the first triode VT1, and the second triode VT2 are connected to the negative pole of the DC power supply.

[0009] In a preferred embodiment, the present utility model can be further configured as follows: The first relay is used to control the opening and closing of the first relay switch KA1, and the second relay is used to control the opening and closing of the second relay switch KA2.

[0010] In a preferred embodiment, the present utility model can be further configured as follows: The emitter - collector of the first triode VT1 is connected to a first LED lamp. The negative pole of the first LED lamp is connected to the negative pole of the power supply, and the first LED lamp emits yellow light. The emitter - collector of the second triode VT2 is connected to a second LED lamp. The negative pole of the second LED lamp is connected to the negative pole of the power supply, and the second LED lamp emits red light.

[0011] In a preferred embodiment, the present utility model can be further configured as follows: The resistance value of the fifth resistor R5 is greater than the resistance value of the sixth resistor R6.

[0012] In a preferred embodiment, the present utility model can be further configured as follows: The cable trench is provided with cable brackets, and the cable brackets are used for placing cables.

[0013] Compared with the prior art, the present application has the following beneficial effects:

[0014] 1. The present application ventilates and dissipates heat inside the cable trench by setting up an air intake system and an air exhaust system, ensuring that the cables are in a good operating environment, thereby increasing the current-carrying capacity of the power cables and improving the efficiency of power transmission.

[0015] 2. The present application turns on the fans by detecting the temperature and humidity inside the cable trench, adjusts the rotation speed of the fans according to the temperature and humidity, and adjusts the ventilation capacity according to the environment, saving energy.

[0016] 3. The multi-stage switching circuit design is simple, cost-effective, and saves production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following further illustrates the present utility model with reference to the accompanying drawings.

[0018] Figure 1 : The multi-stage switching circuit diagram of the present application;

[0019] Figure 2 : The structure diagram of the present application.

[0020] Reference numerals in the drawings: 1, trench; 2, cover plate; 3, air inlet; 4, air outlet; 5, air intake duct; 6, air exhaust duct; 7, intake fan; 8, exhaust fan; 9, multi-stage switching circuit; 10, temperature sensor; 11, humidity sensor; 12, cable support; 13, cable. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The role of the drawings is to supplement the description in the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but it should not be construed as a limitation on the protection scope of the present utility model.

[0022] The following further elaborates on the present utility model in conjunction with the attached Figure 1-2 for a more detailed description.

[0023] Referring to Figure 1 and Figure 2 , in the description of the present utility model, the present utility model provides a cable trench ventilation structure, including a cable trench 1 and a cover plate 2. A cover plate is provided at the top of the cable trench 1. An air inlet 3 and an air outlet 4 are respectively provided on both sides of the cable trench 1. The air inlet 3 is connected to the cable trench 1 through an air intake duct 5, and the air outlet 4 is connected to the cable trench 1 through an air exhaust duct 6. An intake fan 7 is provided at the intersection of the air inlet 3 and the air intake duct 5, and an exhaust fan 8 is provided at the intersection of the air outlet 4 and the air exhaust duct 6. The intake fan 7 and the exhaust fan 8 are connected to a multi-stage switching circuit.

[0024] The connection between the air inlet duct 5 and the cable trench 1 is arranged at the lower end on one side of the cable trench 1, and the connection between the air outlet duct 6 and the cable trench 1 is arranged at the upper end on the opposite side of the cable trench 1. External air enters the interior of the cable trench 1 through the air inlet 3 via the air inlet duct 5, moves upward, and is discharged through the air outlet duct 6 and the air outlet 4, thereby forming ventilation and heat dissipation between the interior of the cable trench 1 and the outside world.

[0025] Refer to Figure 2 Temperature sensors 10 and humidity sensors 11 are respectively arranged on the side walls of the cable trench 1, and the temperature sensors 10 and the humidity sensors 11 are respectively connected to the multi - gear switching circuit 9.

[0026] The temperature sensors 10 and the humidity sensors 11 are used to detect the temperature and humidity in the cable trench, and the ventilation capacity is adjusted according to the temperature and humidity.

[0027] Refer to Figure 1 The multi - gear switching circuit 9 includes a temperature sensor, a first voltage comparator U1, a second voltage comparator U2, a first to sixth resistor, a first zener diode D1, a second zener diode D2, a first relay, a first relay switch KA1, a second relay, a second relay switch KA2, an AND gate, an XOR gate, a first triode VT1, a second triode VT2, and a fan. The positive input terminal of the first voltage comparator U1 is connected to the temperature sensor, the negative input terminal is connected to the first resistor R1 and the cathode of the first zener diode D1, and the output terminal is connected to the input terminal of the XOR gate. The positive input terminal of the second voltage comparator U2 is connected to the humidity sensor, the negative input terminal is connected to the second resistor R2 and the cathode of the second zener diode, and the output terminal is connected to the input terminal of the XOR gate. The temperature sensor and the humidity sensor are respectively connected to the input terminals of the AND gate. The output terminal of the AND gate is connected to a third resistor R3, and the third resistor R3 is connected to the base of the first triode VT1. The collector of the first triode VT1 is connected to the power supply through the first relay. The output terminal of the XOR gate is connected to a fourth resistor R4, and the fourth resistor R4 is connected to the base of the second triode VT2. The collector of the second triode is connected to the power supply through the second relay. One end of the fan is connected to the negative pole of the power supply, and the other end is connected in parallel with the fifth resistor R5 and the sixth resistor R6. A first relay switch KA1 is connected between the sixth resistor R6 and the power supply, and a first relay switch KA2 is connected between the fifth resistor R5 and the power supply. The anodes of the first zener diode D1, the second zener diode D2, the emitters of the first triode VT1, and the second triode VT2 are connected to the negative pole of the DC power supply.

[0028] Refer to Figure 1 The first relay is used to control the opening and closing of the first relay switch KA1, and the second relay is used to control the opening and closing of the second relay switch KA2.

[0029] Reference Figure 1 A first LED lamp is connected to the emitter of the first triode VT1. The negative electrode of the first LED lamp is connected to the negative electrode of the power supply. The first LED lamp emits yellow light. A second LED lamp is connected to the emitter of the second triode VT2. The negative electrode of the second LED lamp is connected to the negative electrode of the power supply. The second LED lamp emits red light.

[0030] When the temperature or humidity is abnormal, the first LED lamp emits yellow light. When both the temperature and humidity are abnormal, the second LED lamp emits red light, serving as a warning.

[0031] Reference Figure 1 A first diode VD1 is connected in parallel across the two ends of the first relay. A second diode VD2 is connected in parallel across the two ends of the second relay. The negative electrodes of the first diode VD1 and the second diode VD2 are connected to the positive electrode of the DC power supply, and the positive electrodes are electrically connected to the collector of the triode. The diode plays a role in preventing reverse current to protect the triode.

[0032] Reference Figure 1 The resistance value of the fifth resistor R5 is greater than that of the sixth resistor R6. The fan speed is adjusted by different resistances.

[0033] Reference Figure 2 The cable trench 1 is provided with a cable support 12, and the cable support is used for placing the cable 13.

[0034] Working principle: The temperature sensor and the humidity sensor are used to detect the environment in the cable trench. When both the temperature and humidity are appropriate, the temperature sensor and the humidity sensor output low levels. The AND gate inputs low levels at both ends, and the AND gate outputs a low level. The base of the first triode VT1 is at a low level, the first triode VT1 is turned off, the first relay does not respond, and the first relay switch is turned off. At the same time, the first voltage comparator U1 and the second voltage comparator U2 output low levels. The XOR gate inputs low levels at both ends, and the XOR gate outputs a low level. The second triode VT2 is cut off, the second relay does not respond, and the second relay switch is turned off, and the fan does not rotate.

[0035] When the temperature is abnormal, the temperature sensor outputs a high level, the humidity sensor outputs a low level. The AND gate inputs a high and a low level, and the AND gate outputs a low level. The base of the first triode VT1 is at a low level, the first triode VT1 is turned off, the first relay does not respond, and the first relay switch is turned off. At the same time, the first voltage comparator U1 outputs a high level, the second voltage comparator U2 outputs a low level. The XOR gate inputs a high and a low level, and the XOR gate outputs a high level. The second triode VT2 conducts, the second relay responds, the second relay switch is closed, and the fan rotates.

[0036] When the humidity is abnormal, the temperature sensor outputs a low level, the humidity sensor outputs a high level. The AND gate inputs a high and a low level, and the AND gate outputs a low level. The base of the first triode VT1 is at a low level, the first triode VT1 is turned off, the first relay does not respond, and the first relay switch is turned off. At the same time, the first voltage comparator U1 outputs a low level, the second voltage comparator U2 outputs a high level. The XOR gate inputs a high and a low level, and the XOR gate outputs a high level. The second triode VT2 conducts, the second relay responds, and the second relay switch is closed, and the fan rotates.

[0037] When both the temperature and humidity are abnormal, the temperature sensor outputs a high level, the humidity sensor outputs a high level. The AND gate inputs a high and a low level, and the AND gate outputs a high level. The first triode VT1 conducts, the first relay responds, and the first relay switch is closed. At the same time, the first voltage comparator U1 outputs a high level, the second voltage comparator U2 outputs a high level. The XOR gate inputs high levels at both ends, and the XOR gate outputs a low level. The second triode VT2 is cut off, the second relay does not respond, and the second relay switch is turned off. The fan rotates. Since the resistance of R6 is less than that of R5, the rotation speed of the fan when KA1 is closed is higher than that when KA2 is closed, enhancing the ventilation ability when both the temperature and humidity are abnormal.

[0038] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A cable channel ventilation structure, comprising a cable channel (1) and a cover plate (2), wherein the cover plate (2) is provided on the top of the cable channel (1), and air inlets (3) and air outlets (4) are provided on both sides of the cable channel (1), wherein the air inlet (3) is connected to the cable channel (1) via an air inlet duct (5), and the air outlet (4) is connected to the cable channel (1) via an air outlet duct (6), and wherein: An air intake fan (7) is provided at the intersection of the air inlet (3) and the air inlet duct (5), an exhaust fan (8) is provided at the intersection of the air outlet (4) and the air outlet duct (6), and the air intake fan (7) and the exhaust fan (8) are connected to a multi-speed switching circuit (9).

2. A cable channel ventilation structure according to claim 1, characterized in that: A temperature sensor (10) and a humidity sensor (11) are respectively provided on the side walls of the cable channel (1), and the temperature sensor (10) and the humidity sensor (11) are respectively connected to the multi-speed switching circuit (9).

3. A cable channel ventilation structure according to claim 2, characterized in that: The multi-speed switching circuit (9) comprises a temperature sensor, a first voltage comparator U1, a second voltage comparator U2, first to sixth resistors, a first voltage regulator diode D1, a second voltage regulator diode D2, a first relay, a first relay switch KA1, a second relay, a second relay switch KA2, an AND gate, an XOR gate, a first transistor VT1, a second transistor VT2 and a fan, wherein the positive input end of the first voltage comparator U1 is connected to the temperature sensor, the negative input end is connected to the first resistor R1 and the negative electrode of the first voltage regulator diode D1, and the output end is connected to the input end of the XOR gate, the positive input end of the second voltage comparator U2 is connected to the humidity sensor, the negative input end is connected to the second resistor R2 and the negative electrode of the second voltage regulator diode, and the output end is connected to the input end of the XOR gate, and the temperature sensor and the humidity sensor are respectively connected to the input end of the AND gate. The output end of the AND gate is connected to a third resistor R3, the third resistor R3 is connected to the base of the first transistor VT1, the collector of the first transistor VT1 is connected to the power supply through the first relay, the output end of the XOR gate is connected to a fourth resistor R4, the fourth resistor R4 is connected to the base of the second transistor VT2, the collector of the second transistor VT2 is connected to the power supply through the second relay, one end of the fan is connected to the negative electrode of the power supply, and the other end is connected to the fifth resistor R5, the sixth resistor R6 is connected to the fifth resistor R5 in parallel, the first relay switch KA1 is connected between the sixth resistor R6 and the power supply, the first relay switch KA2 is connected between the fifth resistor R5 and the power supply, the anode of the first voltage regulator tube D1, the anode of the second voltage regulator tube D2, the emitter of the first transistor VT1, and the emitter of the second transistor VT2 are connected to the negative electrode of the DC power supply.

4. A cable channel ventilation structure according to claim 3, characterized in that: The first relay is used to control the opening and closing of the first relay switch KA1, and the second relay is used to control the opening and closing of the second relay switch KA2.

5. A cable channel ventilation structure according to claim 4, characterized in that: The emitter set of the first transistor VT1 is connected to a first LED lamp, the cathode of the first LED lamp is connected to the cathode of the power supply, and the first LED lamp emits yellow light. The emitter set of the second transistor VT2 is connected to a second LED lamp, the cathode of the second LED lamp is connected to the cathode of the power supply, and the second LED lamp emits red light.

6. A cable channel ventilation structure according to claim 5, characterized in that: A first diode VD1 is connected in parallel at both ends of the first relay, and a second diode VD2 is connected in parallel at both ends of the second relay. The cathodes of the first diode VD1 and the second diode VD2 are connected to the positive electrode of the DC power supply, and the positive electrodes are electrically connected to the collector of the transistor.

7. A cable channel ventilation structure according to claim 6, characterized in that: The resistance of the fifth resistor R5 is greater than the resistance of the sixth resistor R6.

8. The cable channel ventilation structure according to claim 1, characterized in that: The cable channel (1) is provided with a cable support (12), and the cable support (12) is used to place a cable (13).

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