High-temperature heat dissipation protection device for resistor cabinet

Abstract

The utility model relates to a resistor cabinet high-temperature heat dissipation protection device, and relates to the technical field of resistor high-temperature heat dissipation protection. The device comprises a cabinet body, a plurality of resistors are arranged in the cabinet body, a speed regulation heat exchange exhaust fan is arranged on the side wall of the cabinet body, a control module is arranged outside the cabinet body, and the speed regulation heat exchange exhaust fan is electrically connected with the control module; a temperature measuring instrument is arranged in the cabinet body and used for detecting the temperature in the cabinet body in real time, the temperature measuring instrument is in communication connection with a control module, the control module controls the rotating speed of the speed regulation heat exchange exhaust fan based on a detection value of the temperature measuring instrument, and filtering air inlet holes are formed in the side wall of the cabinet body. The resistor cabinet has the effects of monitoring the temperature in the resistor cabinet in real time, flexibly adjusting the heat dissipation efficiency according to the amount of heat generated by the resistor, and protecting the use safety of the resistor cabinet.

Description

Technical Field

[0001] The present application relates to the technical field of high-temperature heat dissipation protection of resistors, and in particular to a high-temperature heat dissipation protection device for a resistor cabinet. Background Art

[0002] Resistors are generally referred to as resistors in daily life. They are a common current limiting component. Connecting a resistor in a circuit can limit the current in the connected branch. Resistors with unchangeable resistance values ​​are called fixed resistors, and resistors with variable resistance values ​​are called potentiometers or variable resistors. Resistors can be divided into starting resistors and braking resistors according to usage requirements. One or more resistors usually need to be installed in a resistor cabinet to achieve the effect of limiting current. However, since resistors generate a lot of heat during use, resistors in resistor cabinets in the prior art are usually naturally cooled by exhaust fans or ambient air. In actual use, if the braking unit of the equipment breaks down, overvoltage and overcurrent will occur at both ends of the resistor, instantly burning the resistor red and generating a lot of heat. At this time, whether it is an exhaust fan or natural cooling with ambient air, the cooling efficiency is relatively low, and the heat dissipation efficiency is uncontrollable, resulting in poor heat dissipation for the resistor and a safety hazard, so it needs to be improved. Utility Model Content

[0003] In order to solve the above problems, the present application provides a high temperature heat dissipation protection device for a resistor cabinet.

[0004] The present application provides a high temperature heat dissipation protection device for a resistor cabinet using the following technical solution:

[0005] A high-temperature heat dissipation protection device for a resistor cabinet comprises a cabinet body, a plurality of resistors are arranged inside the cabinet body, a speed-regulating heat-exchanging exhaust fan is arranged on the side wall of the cabinet body, a control module is arranged outside the cabinet body, and the speed-regulating heat-exchanging exhaust fan and the control module are electrically connected; a thermometer is arranged inside the cabinet body for real-time detection of the internal temperature of the cabinet body, the thermometer is communicatively connected with the control module, and the control module controls the rotation speed of the speed-regulating heat-exchanging exhaust fan based on the detection value of the thermometer, and a filtered air inlet hole is opened on the side wall of the cabinet body.

[0006] By adopting the above technical solution, when the thermometer detects the temperature value in the cabinet in real time and sends it to the control module, the control module will adjust the speed of the heat exchange exhaust fan to the corresponding speed according to the size of the temperature value to dissipate the heat in the cabinet in time. After the speed-adjustable heat exchange exhaust fan draws out the hot air in the cabinet, cold air will enter the cabinet through the filtered air inlet hole, thereby cooling the resistor to ensure the working safety of the resistor and reduce safety hazards. The protection device of the present application can control the heat dissipation efficiency according to the actual detected temperature value, and the flexibility and safety are significantly improved.

[0007] Optionally, the filtered air inlet hole is opened below the side wall of the cabinet, and the speed-adjustable heat-exchange exhaust fan is arranged above the side wall of the cabinet.

[0008] By adopting the above technical solution, due to the expansion of hot air, the overall mass is lighter and will gather on the top of the cabinet. The speed-regulated heat exchange exhaust fan is set on the top to speed up the extraction efficiency of hot air, thereby improving the heat dissipation performance. At the same time, since the cabinet is in an exhaust state, the cabinet is in a negative pressure state, and cold air enters the cabinet through the filtered air inlet hole set at the bottom. The cold air will move toward the speed-regulated heat exchange exhaust fan and fully cool the resistor during the rising process. This spatial layout can achieve a more efficient heat dissipation and cooling effect for the cabinet and radiator.

[0009] Optionally, the filter air inlet hole is square, and a breathable filter layer is provided in the filter air inlet hole.

[0010] By adopting the above technical solution, providing an air-permeable filter layer can prevent external dust and impurities from entering the cabinet, thereby ensuring the normal operation of the cabinet and the resistor.

[0011] Optionally, each of the resistors is electrically connected to a voltmeter, which is communicatively connected to a control module. The voltmeter is used to detect the voltage across the resistor in real time and generate a voltage signal to transmit to the control module. The control module controls the speed of the speed-regulating heat exchange exhaust fan based on the voltage signal.

[0012] By adopting the above technical solution, when the voltage signal is abnormal and the detection value of the thermometer does not change significantly, the resistor is in a high-load operating state and there is a safety hazard. By adjusting the speed of the speed-regulating heat exchange exhaust fan through the control module, the resistor can be cooled in time, thereby improving the safety of the resistor cabinet.

[0013] Optionally, the control module is also communicatively connected to an upper level chopper, and the upper level chopper sends a real-time open circuit voltage to the control module. The control module monitors the working state of the resistor based on a comparison result between the voltage signal and the open circuit voltage.

[0014] By adopting the above technical solution, if a resistor is in an abnormal working state and the temperature value detected by the thermometer does not change much, the conventional control module will not adjust the speed of the speed-regulating heat exchange exhaust fan. In this state, there are also safety hazards. The control module connects the upper-level chopper to compare the open-circuit voltage of the upper-level equipment with the voltage signal of the resistor. When there is a large difference between the voltage signal and the open-circuit voltage of the resistor, it indicates that the resistor is in an abnormal working state. At this time, the control module will also adjust the speed of the speed-regulating heat exchange exhaust fan, thereby further improving the sensitivity and accuracy of the heat dissipation protection device of the present application and ensuring the working safety of the resistor cabinet.

[0015] Optionally, an audible and visual alarm is arranged outside the cabinet, and the audible and visual alarm is controlled by a control module, and the control module controls the opening and closing of the audible and visual alarm based on the working state of the resistor.

[0016] By adopting the above technical solution, setting up an audible and visual alarm can enable the staff to promptly understand that the resistor cabinet is in a high-load operation state, so that the staff can intervene in time and perform maintenance when necessary to ensure the stable and safe operation of the resistor cabinet.

[0017] Optionally, the control module is also electrically connected to a main power contactor, which is used to control the on / off of a circuit of the cabinet. The control module controls the closing or opening of the main power contactor based on the working state of the resistor.

[0018] By adopting the above technical solution, when the heat dissipation efficiency of the resistor cabinet cannot keep up with the speed of heat generation, the circuit is directly disconnected through the main power contactor, thereby interrupting the operation of the resistor cabinet to ensure safety.

[0019] Optionally, the control module adopts a PLC controller.

[0020] By adopting the above technical solution, the PLC controller has good stability and reliability, can ensure timely control of various components, and is easy to operate.

[0021] In summary, the present application includes at least one of the following beneficial technical effects:

[0022] 1. When the thermometer detects the temperature value in the cabinet in real time and sends it to the control module, the control module will adjust the speed of the heat exchange exhaust fan to the corresponding speed according to the temperature value to dissipate the heat in the cabinet in time. After the speed heat exchange exhaust fan extracts the hot air in the cabinet, the cold air will enter the cabinet through the filter air inlet hole, thereby cooling the resistor to ensure the working safety of the resistor and reduce safety hazards; the protection device of the present application can control the heat dissipation efficiency according to the actual detected temperature value, and the flexibility and safety are significantly improved;

[0023] 2. This application is equipped with components such as a voltmeter, an audible and visual alarm, and a main power contactor, so that the control module can more accurately perform heat dissipation protection on the resistor cabinet and improve safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a high temperature heat dissipation protection device for a resistor cabinet in an embodiment of the present application.

[0025] Figure 2 It is a block diagram of the electrical connection structure of the control module in the embodiment of the present application.

[0026] Explanation of the reference numerals: 1. cabinet; 2. resistor; 3. filtered air inlet; 4. speed-regulating heat-exchanging exhaust fan; 5. thermometer; 6. voltmeter; 7. control module; 8. sound and light alarm; 9. main power contactor; 10. upper chopper. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1-2 This application is described in further detail.

[0028] The present application embodiment discloses a high temperature heat dissipation protection device for a resistor cabinet. Figure 1 and Figure 2 , including a resistor cabinet body 1, a plurality of resistors 2 are arranged in the cabinet body 1, and speed-regulating heat-exchanging exhaust fans 4 are arranged above the side walls on both sides of the cabinet body 1, so as to quickly extract the hot air when the resistors 2 in the cabinet body 1 generate heat, and a control module 7 is arranged outside the cabinet body 1, and the speed-regulating heat-exchanging exhaust fans 4 are electrically connected to the control module 7, and the speed of the speed-regulating heat-exchanging exhaust fans 4 can be adjusted by the control module 7 to achieve switching of different heat dissipation efficiencies. In this embodiment, the control module 7 adopts a PLC controller to achieve stable and efficient control of the circuit elements in the cabinet body 1; square filter air inlet holes 3 are opened at the bottom of the side walls on both sides of the cabinet body 1, and a breathable filter layer is arranged in each filter air inlet hole 3 to prevent external dust and impurities from entering the interior of the cabinet body 1. In the process of heat dissipation, external cold air will enter the cabinet body 1 through the filter air inlet hole 3 below, thereby cooling the resistors 2 in the cabinet body 1.

[0029] Reference Figure 1 and Figure 2 A thermometer 5 is provided in the resistance cabinet for detecting the temperature in the cabinet 1 in real time. The thermometer 5 is connected to the control module 7 for sending the temperature value to the control module 7 in real time. The control module 7 pre-stores a comparison table of the temperature in the cabinet 1 and the speed of the speed-regulating heat-exchanging exhaust fan 4. Different temperatures will use different speeds to achieve efficient heat dissipation. For example, when the temperature is 50°C, the speed of the speed-regulating heat-exchanging exhaust fan 4 is 1500r / min.

[0030] Reference Figure 1 and Figure 2 Each resistor 2 is connected in parallel with a voltmeter 6, which is used to detect the voltage across the resistor 2 in real time and generate a voltage signal. The voltmeter 6 is connected to the control module 7 for communication, and sends the generated voltage signal to the control module 7. The control module 7 adjusts the speed of the speed-regulating heat-exchange exhaust fan 4 based on the voltage signal to perform heat dissipation in special circumstances when the voltage across the resistor 2 exceeds the rated voltage and the temperature measurement of the thermometer 5 is normal, so as to ensure the safe operation of the resistor cabinet.

[0031] Reference Figure 1 and Figure 2 The control module 7 is also communicatively connected to the upper chopper 10 of the upper device of the resistor cabinet. The control module 7 receives the open-circuit voltage of the upper chopper 10 itself in real time, and compares the open-circuit voltage with the voltage signal sent by the voltmeter 6. When the voltage signal has an obvious deviation relative to the open-circuit voltage, it indicates that the resistor 2 is in an overloaded operating state. At this time, even if the thermometer 5 does not produce a large temperature value, the control module 7 will adjust the speed of the speed-regulating heat exchange exhaust fan 4 to achieve the effect of rapid heat dissipation and cooling.

[0032] Reference Figure 1 and Figure 2 An audible and visual alarm 8 is arranged outside the cabinet 1, and the audible and visual alarm 8 is electrically connected to the control module 7. When the comparison result between the voltage signal and the open-circuit voltage is abnormal, the control module 7 will start the audible and visual alarm 8 so that the staff can know the abnormal change of the resistor 2 in time, so as to inspect and repair the resistor 2 more efficiently and ensure the normal operation of the resistor cabinet.

[0033] Reference Figure 1 and Figure 2 A main power contactor 9 is also provided on the outside of the cabinet 1. When the main power contactor 9 is in contact, the normal operation of the internal circuit of the cabinet 1 is maintained. When the main power contactor 9 is disconnected, the circuit in the resistor cabinet is disconnected. The main power contactor 9 is communicated with the control module 7. When the comparison result between the voltage signal and the open-circuit voltage is abnormal, the control module 7 will control the main power contactor 9 to disconnect, thereby preventing the temperature in the cabinet 1 from rising too fast, the heat dissipation is not timely, and the safety hazard is generated.

[0034] The implementation principle of the high-temperature heat dissipation protection device of the resistor cabinet in the embodiment of the present application is as follows: the resistor 2 in the cabinet body 1 will generate heat during use. When the temperature measuring instrument 5 detects that the temperature is too high, a signal is transmitted to the control module 7. The control module 7 will issue an instruction to the speed-adjustable heat exchange exhaust fan 4 to adjust the speed, so that the speed-adjustable heat exchange exhaust fan 4 increases the power to exhaust air in the resistor cabinet. Under normal temperature conditions, the speed-adjustable heat exchange exhaust fan 4 will run at a uniform speed. When the speed-adjustable heat exchange exhaust fan 4 is running, the cold air is filtered and isolated from the filter air inlet 3 under the resistor cabinet. The dust enters the resistor cabinet, absorbs the heat in the resistor cabinet, and then is discharged from the resistor cabinet through the speed-regulated heat-exchange exhaust fan 4 to achieve heat dissipation in the resistor cabinet; the voltmeter 6 monitors the operating voltage of the resistor 2 and compares it with the open-circuit voltage of the upper-level equipment to monitor the working state of the resistor 2. When the working state of the resistor 2 is abnormal or the thermometer 5 senses that the temperature is too high, the speed-regulated heat-exchange exhaust fan 4 increases the power to exhaust the air in the resistor cabinet, and at the same time the control module 7 will issue a command to disconnect the main power contactor 9 of the equipment to cut off the power of the equipment and activate the sound and light alarm 8 to sound an alarm.

[0035] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A high temperature heat dissipation protection device for a resistor cabinet, comprising a cabinet body (1), wherein a plurality of resistors (2) are arranged in the cabinet body (1), characterized in that: The cabinet (1) is provided with a speed-adjustable heat-exchange exhaust fan (4) on the side wall, and a control module (7) is provided outside the cabinet (1). The speed-adjustable heat-exchange exhaust fan (4) and the control module (7) are electrically connected; a temperature measuring instrument (5) is provided inside the cabinet (1) for real-time detection of the internal temperature of the cabinet (1), and the temperature measuring instrument (5) is in communication connection with the control module (7). The control module (7) controls the rotation speed of the speed-adjustable heat-exchange exhaust fan (4) based on the detection value of the temperature measuring instrument (5); a filtering air inlet hole (3) is provided on the side wall of the cabinet (1); each of the resistors (2) is electrically connected to an electric A voltage meter (6) is communicatively connected to a control module (7), the voltage meter (6) is used to detect the voltage across the resistor (2) in real time and generate a voltage signal for transmission to the control module (7), and the control module (7) controls the speed of the speed-regulating heat exchange exhaust fan (4) based on the voltage signal; the control module (7) is also communicatively connected to an upper-level chopper (10), and the upper-level chopper (10) sends the real-time open-circuit voltage to the control module (7), and the control module (7) monitors the working state of the resistor (2) based on the comparison result between the voltage signal and the open-circuit voltage.

2. A high temperature heat dissipation protection device for a resistor cabinet according to claim 1, characterized in that: The filtering air inlet hole (3) is provided below the side wall of the cabinet (1), and the speed-adjustable heat-exchanging exhaust fan (4) is arranged above the side wall of the cabinet (1).

3. A high temperature heat dissipation protection device for a resistor cabinet according to claim 2, characterized in that: The filtering air inlet hole (3) is square, and a breathable filtering layer is arranged inside the filtering air inlet hole (3).

4. A high temperature heat dissipation protection device for a resistor cabinet according to claim 1, characterized in that: An audible and visual alarm (8) is arranged outside the cabinet (1), and the audible and visual alarm (8) is controlled by a control module (7). The control module (7) controls the opening and closing of the audible and visual alarm (8) based on the working state of the resistor (2).

5. A high temperature heat dissipation protection device for a resistor cabinet according to claim 1, characterized in that: The control module (7) is also electrically connected to a main power contactor (9), and the main power contactor (9) is used to control the on / off of the circuit of the cabinet (1). The control module (7) controls the closing or opening of the main power contactor (9) based on the working state of the resistor (2).

6. A high temperature heat dissipation protection device for a resistor cabinet according to claim 1, characterized in that: The control module (7) adopts a PLC controller.

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