CN110113916B - Dustproof heat dissipation system and method for subway vehicle-mounted controller cabinet - Google Patents
Dustproof heat dissipation system and method for subway vehicle-mounted controller cabinet Download PDFInfo
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- CN110113916B CN110113916B CN201910346148.3A CN201910346148A CN110113916B CN 110113916 B CN110113916 B CN 110113916B CN 201910346148 A CN201910346148 A CN 201910346148A CN 110113916 B CN110113916 B CN 110113916B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20845—Modifications to facilitate cooling, ventilating, or heating for automotive electronic casings
- H05K7/20863—Forced ventilation, e.g. on heat dissipaters coupled to components
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- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20845—Modifications to facilitate cooling, ventilating, or heating for automotive electronic casings
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Abstract
The invention discloses a dustproof heat dissipation system and method for a controller cabinet on a subway vehicle. The system consists of a positive pressure dustproof heat dissipation unit for filtering air inlet and air outlet by a dustproof filter screen of a fan, an airflow organization heat dissipation unit for separating cold air and hot air to flow orderly, a heat pipe heat dissipation unit, an automatic dustproof filter screen updating unit and a signal processing main control unit. The dustproof heat dissipation system is embedded into the vehicle-mounted controller cabinet, and the working temperature exceeds the alarm temperature, so that the traditional negative pressure heat dissipation mode is switched, the TCO of the system is reduced, and the reliability of the system is improved; a dustproof filter screen of a fan is adopted to filter air inlet and air outlet of a cabinet, and positive air pressure is formed in the cabinet and prevents dust from entering the cabinet; the cabinet air path is designed, so that cold air and hot air are separated and flow orderly, and the heat dissipation efficiency is improved; hot spot heat of the vehicle-mounted controller is conducted by the heat pipe, so that the heat pipe is efficient and effective; the dustproof filter screen is automatically updated, operation and maintenance are reduced, and good dustproof heat dissipation performance is achieved.
Description
Technical Field
The invention belongs to the technical field of dustproof heat dissipation. In particular to a dustproof heat dissipation system and a method of a subway vehicle-mounted controller cabinet, which adopt positive pressure, self-renew a filter screen according to wind resistance, heat dissipation of heat points in the cabinet through a heat pipe and separation of cold air and hot air.
Background
In 1863, the first metropolitan subway line drawn by steam locomotives in the world built a traffic train in london, the united kingdom, which had been accompanied by mankind over 155 years as an important urban transportation means. In the 60 s of the 20 th century, Beijing developed the first subway line in China. The subway has the advantages of large transportation amount, energy conservation, high efficiency, land resource conservation and the like, and is a good party for solving the urban traffic dilemma and is widely favored. With the progress of urbanization in recent years, subways are developed in a well-jet manner with the support of policies and funds. As far as 2016, the running mileage of the rail transit in China reaches 4150km, and the rail transit is the first place in the world; about 100 cities in China plan about 10000km urban rail transit construction projects; in 2020, more than 60 cities are expected to open 8000km subway operation lines; the development of the subway effectively improves the traffic condition of the city.
The signal system is an important component of the subway, the operation efficiency and the safety of the subway are directly influenced, and the signal system is just like human nerves permeating each layer of train control operation. In order to meet the operation requirements of high running density and short running distance of subway trains, the current mainstream subway train control system adopts a communication-based train operation control system (CBTC), which provides efficient train-ground two-way communication, accurate train positioning, reliable movement blocking and high-speed train operation for the subway; the transportation efficiency is greatly improved. The key equipment for realizing the CBTC system is a vehicle-mounted controller (CC), because the instruction of the CBTC train control system depends on the supervision and execution of the vehicle-mounted controller, and the train positioning and running conditions are all dependent on the feedback of the vehicle-mounted controller. As an important ring of the whole train control system, the reliable and stable operation of the vehicle-mounted controller is the premise of ensuring the realization of the CBTC function of the train control system. Taking a Hangzhou subway one-size line as an example, the main bodies of train vehicle-mounted controllers (CC) are two sets of automatic train protection and operation (ATP/ATO) cages. The cage model is N29100402/502, manufacturer Shenyang Signal factory. The two machine cages are internally provided with board cards such as an Ethernet exchange and expander board, a main processor board, a memory board, an input/output board, a power board and the like; is responsible for train positioning, supervising train operating speed, ensuring proper braking sequence, managing train control modes, and controlling trains according to authorization information provided by a trackside Zone Controller (ZC).
The realization of the function of the vehicle-mounted controller depends on the normal work of two sets of automatic train protection and operation (ATP/ATO) cages. The same conclusion is obtained by researchers according to environment detection data of a subway operation section: the air in the subway operation region is rich in metal particles. Tracing the source: metal particles are generated when the train runs and brakes; in a relatively closed, moist and dusty subway environment, piston wind formed by high-speed running of a train exists; the piston wind is used for wrapping metal particles, and the metal particles are diffused in the air in the operation interval for a long time. Dust particles, moisture, and particularly the above-mentioned "metal particles", seriously threaten the reliability of the in-vehicle electronic equipment. As the operation time of the subway goes on, the harm degree of the metal particles rises; the quantity of the metal particles is positively correlated with the time because of the inherent accumulation effect of the metal particles. It must be noted that there has been no effective technical means to clean the "metal particles" inventory, preventing the "metal particles" from being increased.
In view of the heat dissipation of the equipment, the existing vehicle-mounted controller cabinet is designed with a ventilation facility which is open up and down. The ventilation facility is a classic structure for heat dissipation of equipment, and is simple and practical. However, it is questionable whether the ventilation facilities with open top and bottom are suitable for subways due to the consideration of avoiding dust prevention; after all, the board card of the vehicle-mounted controller needs to work in long period under the harsh environment of dust particles, moisture and metal particles. Dust particles and metal particles enter a controller cage along with cooling air of vehicle-mounted electronic equipment through a vent, the change of direction and speed of airflow are inevitable when the cooling air flows through the cage, and part of the dust particles and the metal particles in the airflow can settle and attach to board cards, fans and corner corners of a vehicle-mounted controller cabinet; the amount of settled attachments increases continuously with time, gradually forming a dust film on the board card. The dust film has a double negative effect on the vehicle electronics: the heat dissipation performance becomes poor and the electrical performance is degraded.
As is well known, the working temperature of electronic equipment is generally maintained in the range of-5 to +65 ℃ when the electronic equipment normally operates. If the temperature exceeds the working temperature range, the performance of the electronic equipment is obviously reduced, and the electronic equipment often cannot work stably, even has the fault of device damage. Research and application show that the failure rate of electronic components increases exponentially with the increase of the working temperature. The reliability of the single semiconductor component is reduced by 50% when the working temperature of the single semiconductor component is increased by 10 ℃, and the service life is halved. The dust film of the good non-heat-transfer conductor is attached to the board card, and the thermal resistance of the component attached with the dust film is equal to the thermal resistance of the dust film plus the thermal resistance of the component, and the thermal resistance of the dust film > the thermal resistance of the component, so that the heat dissipation performance of the board card is deteriorated, and the working temperature of the electronic component is increased. On the other hand, dust particles and metal particles are gathered or embedded into exposed pins of the circuit board, the plating layer of the circuit board can be corroded, halo-shaped corrosion spots taking corrosive particles as cores are generated, the contact resistance of the central part can reach dozens of to hundreds of ohms, and the risk of electric contact failure is increased; such as air moisture, electrolyte in dust and moisture combined action, circuit board insulation performance reduction and even short circuit; the unique metal particles of the subway play the role of an accelerator for deteriorating the insulation performance, the probability of local discharge and short circuit of a device is increased rapidly, and the electrical performance of a board card is reduced. Once the vehicle-mounted controller fails, the train control system is broken down and loss is immeasurable.
Aiming at the fact that the operation space of the subway is full of dust particles and metal particles during the operation, the necessary condition for the stable and reliable operation of the vehicle-mounted controller is that a corresponding dustproof heat dissipation system is designed for the cabinet of the vehicle-mounted controller of the subway: by adopting various dustproof methods, the generation condition of the dust film is eliminated, and the source of the electric performance reduction is eradicated; by means of a plurality of heat dissipation technologies, the comprehensive heat dissipation performance of the cabinet is improved. The engineering implementation of the dustproof heat dissipation system follows that:
firstly, but if possible, the original structure of the vehicle-mounted controller cabinet is kept, which is a design criterion for reducing the common compliance of TCO during equipment transformation; the dustproof and the heat dissipation are regarded as an integral body which can not be divided, and the overall arrangement is considered. Therefore, the designed dustproof heat dissipation system is basically embedded into the cabinet of the vehicle-mounted controller and runs independently in parallel with the vehicle-mounted controller.
Secondly, a negative pressure heat dissipation technology that a fan is used for exhausting air, air is fed into a gap of a cabinet, and dust particles are settled in the cabinet is abandoned; by using the achievements of the industrial personal computer, a dustproof heat dissipation technology that a fan and a dustproof filter screen are used for filtering air inlet and air outlet of a cabinet gap or an air outlet is adopted; form positive atmospheric pressure in the rack and prevent dust: prevent dust particles and metal particles from entering the cabinet.
Thirdly, adjusting the gap of the cabinet or the air outlet and the air path; the fan sucks the filtered cooling gas, and the cooling gas absorbs the heat generated by the subway vehicle-mounted controller through the board card and is directly discharged from a gap of the cabinet or a gas outlet; the cold and hot air is separated and flows orderly, and the cold and hot air are isolated relatively, so that the heat dissipation efficiency is improved.
Fourth, the up-down open type ventilation facility is essentially a 'flood irrigation' type heat dissipation technology. Under the same condition, the heat dissipation capability of the air inlet of the fan and the dustproof filter screen and the heat dissipation capability of the machine cabinet gap or the air outlet of the machine cabinet and the air outlet of the dustproof filter screen are inferior to those of the air inlet of the fan and the dustproof filter screen. Therefore, the hot points (the main processor, the power supply power amplification tube and the like) in the vehicle-mounted controller are additionally provided with the accurate drip irrigation type heat pipe for heat dissipation, and the heat pipe has a compact and efficient structure and can be installed in a narrow space of a cabinet; the hot spot heat is led out through the heat pipe, so that the heat dissipation problem of the hot spot is solved, and the integral heat dissipation problem of the vehicle-mounted controller is solved.
Fifthly, detecting the air flow speed of the cooling air to obtain whether the blockage of a filter screen for filtering and air inlet of the fan reaches a critical value; if the critical value is reached, the dustproof filter screen is automatically updated in real time, otherwise, the filter screen is continuously used.
The summary of representative intellectual property achievements in the aspect of dustproof and heat dissipation of the subway vehicle-mounted controller cabinet is as follows:
the invention discloses an electric device with a heat radiation structure (CN107332136A), and provides a cooling fan which automatically generates strong cold air through the double functions of negative pressure and temperature difference by means of cold air chambers and cold air fans arranged on two sides of a cabinet body, so as to refrigerate and radiate heat.
The invention discloses an automatic regulation and control type heat-dissipation dustproof power distribution cabinet (CN105790107A), and provides a method for adjusting the working states of a blower and an air inducing device in real time through sensor feedback to ensure that all electric elements in the power distribution cabinet always run in an optimal temperature environment.
The beneficial exploration is an overview of the research result of the heat dissipation of the electric cabinet body; unfortunately, at present, the dustproof heat dissipation system of the subway vehicle-mounted cabinet is a little in the way, and the safety requirement of subway operation cannot be met for a long time. Therefore, it is necessary to make further innovative design based on the existing results.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a dustproof heat dissipation system and a method for a controller cabinet on a subway vehicle.
A dustproof heat dissipation system of a cabinet of a subway vehicle-mounted controller is characterized by comprising a positive-pressure dustproof heat dissipation unit, an airflow organization heat dissipation unit, a heat pipe heat dissipation unit, a dustproof filter screen automatic updating unit and a signal processing main control unit, wherein the positive-pressure dustproof heat dissipation unit is used for filtering air inlet and air outlet through a dustproof filter screen of a fan, the airflow organization heat dissipation unit is used for separating cold air and hot air to flow orderly, and the dustproof heat dissipation system is embedded in the cabinet of the subway vehicle-mounted controller; the signal processing main control unit is respectively connected with the positive pressure dustproof heat dissipation unit and the dustproof filter screen automatic updating unit;
the positive pressure dustproof heat dissipation unit sucks cooling air filtered by the dustproof filter screen under the control of the signal processing main control unit; the airflow organization heat dissipation unit guides the sucked cooling air, the cooling air flows through the vehicle-mounted controller in order, absorbs the heat generated by the vehicle-mounted controller and is discharged out of the cabinet from the air outlet; the heat of the hot point of the vehicle-mounted controller is directly led out of the cabinet through the heat pipe radiating unit; the automatic dustproof filter screen updating unit executes automatic updating operation of the dustproof filter screen under the control of the signal processing main control unit; the signal processing main control unit takes an STM32F407 chip as a core.
The positive-pressure dustproof heat dissipation unit comprises a fan power pack, an air pressure sensor, a temperature sensor and a dustproof filter screen, the signal processing main control unit is respectively connected with the fan power pack, the air pressure sensor and the temperature sensor are arranged on the inner side wall of the cabinet and upload air pressure and temperature working condition parameters in the cabinet to the signal processing main control unit, and the models of the air pressure sensor and the temperature sensor are MS5535BM and DS18B20 respectively;
the signal processing main control unit is connected with a fan power pack, a direct current brushless motor driving module and a direct current brushless motor driving module which control the fan power pack drive a direct current brushless motor, the direct current brushless motor drives a fan, the fan sucks external cooling air filtered by a dustproof filter screen, the cooling air enters an air inlet duct of the airflow organization heat dissipation unit, the dustproof filter screen is made of polyurethane filter cotton, and the dustproof filter screen is arranged at an air inlet of the fan; the fan power pack is installed at the bottom of the side wall of the cabinet, and the models of the direct current brushless motor driving module, the direct current brushless motor and the fan are DBLS-01, 57BL-1010H1-LS-B and 614DGML respectively.
The airflow organization heat dissipation unit comprises an air inlet duct, an air inlet outlet multiplied by 6, an air outlet multiplied by 6 and an air outlet dust screen multiplied by 6; the air inlet outlet multiplied by 6 consists of a 1 st air inlet outlet, a 2 nd air inlet outlet and a 6 th air inlet outlet which are sequentially increased in sequence, an air inlet air channel is arranged at the bottom end of the cabinet, an opening is formed in the air inlet air channel to obtain the air inlet outlet multiplied by 6, and the air outlet direction of the air inlet outlet multiplied by 6 is parallel to the board card; the air outlet x 6, the air outlet dust screen x 6 and the air inlet outlet x 6 are similar, the opening is positioned at the top end of the cabinet, and the air outlets and the air outlet dust screens are assembled in a one-to-one correspondence manner; the number of the air inlet outlets is equal to the number of the board cards plus 1, the air inlet outlets are positioned at the bottom end of the cabinet, between the two board cards or between the board cards and the side wall of the cabinet, and the air outlet is positioned at the top end of the cabinet, between the two board cards or between the board cards and the side wall of the cabinet; cooling air sucked by the fan power pack is input into the air inlet duct, and the cooling air is distributed to each board card through an air inlet outlet X6 on the air inlet duct; cooling air flows through the board cards in order to absorb heat generated by the board cards, and is exhausted from the cabinet through an air outlet multiplied by 6 and an air outlet dustproof net multiplied by 6;
the heat pipe radiating unit comprises a heat absorbing copper plate, radiating fins and heat pipes, wherein each heat pipe consists of a 1 st heat pipe and a 2 nd heat pipe; one end of the 1 st heat pipe is contacted with a main processor radiator of the signal processing main control unit, the other end is contacted with a heat absorption copper plate, and the 2 nd heat pipe is similar to the 1 st heat pipe and conducts heat of the power supply power amplification pipe radiator; the radiating fins are in contact with the heat-absorbing copper plate.
The automatic updating unit of the dustproof filter screen comprises a stepping motor power pack, the dustproof filter screen, an air speed sensor, a driving shaft, a driven shaft, a transmission belt multiplied by 2 and a support frame; the signal processing main control unit is connected with the stepping motor power pack and the air speed sensor, and the air speed sensor transmits the air speed of the cooling air in the air inlet duct to the signal processing main control unit;
the signal processing main control unit is connected with the stepping motor power pack, and controls a stepping motor driving module and a stepping motor driving module of the stepping motor power pack to drive a stepping motor according to the wind speed of cooling air of an air inlet duct uploaded by a wind speed sensor, and the stepping motor drives a driving shaft, a transmission belt X2 and a driven shaft to perform automatic updating operation of the dustproof filter screen; the models of the stepping motor driving module, the stepping motor and the wind speed sensor are SH-20806N, 35BYG250B-0081 and WD4001 respectively; the dustproof filter screen is wound on the driven shaft, the stepping motor of the stepping motor power pack drives the driving shaft to be connected with the driven shaft through a transmission belt X2 at two ends of the shaft, and the dustproof filter screen rotates along with the driven shaft to finish the updating of the dustproof filter screen; the automatic updating unit of the dustproof filter screen is fixed on the machine cabinet by means of a support frame.
The dustproof heat dissipation method flow of the dustproof heat dissipation system comprises a preparation flow of the dustproof heat dissipation method and an operation flow of the dustproof heat dissipation method;
description of variables
Atmospheric atmos
Positive pressure plus pressure + Δ p, Δ p > 0
Cabinet pressure cabin pressure
Operating temperature t
Normal operating temperature range, temperature _ normal
The upper limit working temperature interval upper limit operating temperature interval,
temperature_upperlimit
alarm operating temperature range of temperature _ alarm
temperature_alarm＞temperature_upperlimit＞
temperature_normal
Power consumption Q _ power _ displacement of controller on subway vehicle
Motor speed n
Speed of cooling air speed _ air
Normal speed n _ normal of motor
Normal wind speed _ air _ normal
Normal wind speed heat dissipation Q _ normal _ heatoutput,
upper limit speed n _ upper limit of motor
Upper limit wind speed _ air _ upper limit
Upper wind speed limit heat dissipation Q _ upper limit _ heatoutput
The alarming rotating speed n _ alarm of the motor, n _ alarm > n _ upper limit > n _ normal
Description of the Algorithm
Positive pressure state at subway vehicle-mounted controller cabinet
cabinet pressure≥plus pressure (1)
t∈temperature_normal
Normal speed n _ normal of motor, normal wind speed _ air _ normal
Normal wind speed heat dissipation Q _ normal _ heatoutput ≈ 4 × Power consumption Q _ power _ displacement
The actual measurement wind speed _ air is less than or equal to 0.6 multiplied by the speed _ air _ normal, the dustproof filter screen is updated (2)
t∈temperature_upperlimit
The upper limit speed n _ upper limit of the motor and the upper limit wind speed _ air _ upper limit of the motor
Upper limit wind speed heat dissipation Q _ upper limit _ heatoutput ≈ 8 × power dissipation Q _ power _ displacement
The actual measurement wind speed _ air is less than or equal to 0.6 multiplied by the speed _ air _ upper limit, and the dustproof filter screen is updated (3)
t∈temperature_alarm
Alarming rotating speed n _ alarm and alarming of motor
Positive pressure air suction to negative pressure air exhaust and motor reverse rotation
Remove dust screen (4)
Preparation process of dustproof heat dissipation method
Setting operation parameters of dustproof heat dissipation system
Positive pressure plus pressure ═ atmos + Δ p
Normal speed n _ normal of motor, normal wind speed _ air _ normal
The upper limit rotating speed n _ upper limit and the upper limit wind speed _ air _ upper limit of the motor
Motor alarm rotating speed n _ alarm
Second, detecting the cabinet pressure of the dustproof heat dissipation system
Normal speed n _ normal of motor
Reading in cabinet pressure by a gas pressure sensor
if cabinet pressure＜plus pressure
Troubleshooting cabinet air-tightness fault of subway vehicle-mounted controller
end
Operation flow of dustproof heat dissipation method
Firstly, the temperature t of the cabinet is collected, and the rotating speed of the motor is set
Temperature sensor reads in cabinet temperature t
Case1 t ∈ temperature _ normal, n ═ n _ normal, turn-
Case2 t belongs to temperature _ upper limit, n-n _ upper limit, turn to third
Case3 t belongs to temperature _ alarm, n is n _ alarm, convert to
Second, collecting wind speed and updating dust-proof filter screen
Wind speed sensor read-in wind speed _ air
if speed_air≤0.6×speed_air_normal
Dust-proof filter screen renewal
Rotating (c)
Collecting wind speed and updating dustproof filter screen
Wind speed sensor read-in wind speed _ air
if speed_air≤0.6×speed_air_upper limit
Dust-proof filter screen renewal
Rotating (c)
Negative pressure heat radiation and alarm
Alarm and removal dustproof filter screen
Motor reverse rotation, positive pressure air suction and negative pressure air exhaust
Rotating (c)
And fifthly, returning to the step I.
Compared with the background technology, the invention has the following beneficial effects: the dustproof heat dissipation system is embedded into the vehicle-mounted controller cabinet, and the working temperature exceeds the alarm temperature, so that the traditional negative pressure heat dissipation mode is switched, the TCO of the system is reduced, and the reliability of the system is improved; a dustproof filter screen of a fan is adopted to filter air inlet and air outlet of a cabinet, and positive air pressure is formed in the cabinet and prevents dust from entering the cabinet; the cabinet air path is designed, so that cold air and hot air are separated and flow orderly, and the heat dissipation efficiency is improved; hot spot heat of the vehicle-mounted controller is conducted by the heat pipe, so that the heat pipe is efficient and effective; the dustproof filter screen of automatic update has reduced fortune dimension and has stable dustproof heat dispersion.
Drawings
Fig. 1(a) is a schematic block diagram of a dustproof heat dissipation system of a controller cabinet on a subway vehicle;
FIG. 1(b) is a schematic structural diagram of a dustproof heat dissipation system of a controller cabinet on a subway vehicle;
FIG. 2 is a three-view illustration of a dustproof heat dissipation system for a controller cabinet onboard a subway;
FIG. 3 is a functional block diagram of a positive pressure dust-proof heat dissipating unit;
FIG. 4(a) is a schematic block diagram of an automatic dust screen renewal unit;
fig. 4(b) is an installation view of the automatic dust screen updating unit;
FIG. 5(a) is a flow chart of a method for dissipating heat and dust;
FIG. 5(b) is a flow chart of a preparation of the dustproof heat dissipation method;
fig. 5(c) is an operation flowchart of the dustproof heat dissipation method.
Detailed Description
As shown in fig. 1(a), fig. 1(b) and fig. 2, the dustproof heat dissipation system of the cabinet of the subway vehicle-mounted controller is composed of a positive-pressure dustproof heat dissipation unit 10 with a dustproof filter screen of a fan for filtering inlet air and outlet air at an air outlet, an airflow organization heat dissipation unit 20 with cold air and hot air separated and flowing in order, a heat pipe heat dissipation unit 30, an automatic dustproof filter screen updating unit 40 and a signal processing main control unit 50, wherein the dustproof heat dissipation system is embedded and installed in a cabinet 60 of the subway vehicle-mounted controller; the signal processing main control unit 50 is respectively connected with the positive pressure dustproof heat dissipation unit 10 and the dustproof filter screen automatic updating unit 40;
the positive pressure dustproof heat dissipation unit 10 sucks cooling air filtered by a dustproof filter screen under the control of the signal processing main control unit 50; the airflow organization heat dissipation unit 20 guides the sucked cooling air, the cooling air flows through the vehicle-mounted controller in order, absorbs the heat generated by the vehicle-mounted controller, and the heat is discharged out of the cabinet 60 from the air outlet; the heat of the hot spot of the vehicle-mounted controller is directly led out from the cabinet 60 through the heat pipe radiating unit 30; the automatic dustproof filter screen updating unit 40 performs an automatic dustproof filter screen updating operation under the control of the signal processing main control unit 50; the signal processing main control unit 50 takes an STM32F407 chip as a core.
As shown in fig. 3 and 2, the positive pressure dustproof heat dissipation unit 10 includes a fan power pack 110, an air pressure sensor 120, a temperature sensor 130, and a dustproof filter screen 140, the signal processing main control unit 50 is connected to the fan power pack 110, the air pressure sensor 120, and the temperature sensor 130, respectively, the air pressure sensor 120, and the temperature sensor 130 are installed on an inner side wall of the cabinet 60, and upload operating condition parameters of air pressure and temperature in the cabinet to the signal processing main control unit 50, and models of the air pressure sensor 120, and the temperature sensor 130 are MS5535BM, and DS18B20, respectively;
the signal processing main control unit 50 is connected with the fan power pack 110, controls the dc brushless motor driving module 111 and the dc brushless motor driving module 111 of the fan power pack 110 to drive the dc brushless motor 112, controls the dc brushless motor 112 to drive the fan 113, and controls the fan 113 to suck the outside cooling air filtered by the dustproof filter screen 140, and the cooling air enters the air inlet duct of the airflow organization heat dissipation unit 20, the dustproof filter screen 140 is made of polyurethane filter cotton, and the dustproof filter screen 140 is arranged at the air inlet of the fan; the fan power pack 110 is installed at the bottom of the side wall of the cabinet 60, and the models of the direct current brushless motor driving module 111, the direct current brushless motor 112 and the fan 113 are DBLS-01, 57BL-1010H1-LS-B and 614DGML respectively.
As shown in fig. 2, the airflow structure heat dissipation unit 20 includes an air inlet duct 210, an air inlet outlet × 6220, an air outlet × 6230, and an air outlet dust screen × 6240; the air inlet outlet multiplied by 6220 is composed of a 1 st air inlet 221, a 2 nd air inlet 222 and a 6 th air inlet 226 which are sequentially increased in sequence, the air inlet duct 210 is arranged at the bottom end of the cabinet 60, holes are formed in the air inlet duct 210 to obtain the air inlet outlet multiplied by 6220, and the air outlet direction of the air inlet outlet multiplied by 6220 is parallel to the board card; the air outlet is multiplied by 6230, the air outlet dust screen is multiplied by 6240, the air inlet outlet is multiplied by 6220, the opening hole is positioned at the top end of the machine cabinet 60, and the air outlet dust screen are correspondingly assembled one by one; the number of the air inlet outlets is equal to the number of the board cards plus 1, the air inlet outlets are positioned at the bottom end of the cabinet 60, between the two board cards or between the board cards and the side wall of the cabinet, and the air outlet is positioned at the top end of the cabinet 60, between the two board cards or between the board cards and the side wall of the cabinet; the air inlet duct 210 inputs cooling air sucked by the fan power pack 110, and the cooling air is distributed to each board card through an air inlet outlet x 6220 on the air inlet duct 210; cooling air flows through the board cards in order to absorb heat generated by the board cards, and is exhausted from the cabinet 60 through an air outlet multiplied by 6230 and an air outlet dustproof net multiplied by 6240;
the heat pipe heat radiation unit 30 includes a heat absorption copper plate 310, heat radiation fins 320, and heat pipes 330, and the heat pipes 330 are composed of a 1 st heat pipe 331 and a 2 nd heat pipe 332; one end of the 1 st heat pipe 331 is in contact with a main processor radiator of the signal processing main control unit 50, and the other end is in contact with the heat absorption copper plate 310, and the 2 nd heat pipe 332 is similar to the 1 st heat pipe 331 and conducts heat of the power supply power amplification tube radiator; the heat radiating fins 320 are in contact with the heat absorbing copper plate 310.
Description 1: without loss of generality, a heat pipe is arranged by taking a heating point main processor and a power supply power amplification tube of the machine cage N29100402/502 as examples; the number of the heat pipes is determined according to the heating points of the service object of the dustproof heat dissipation system. The number of the air inlet and the air outlet is equal to the number of the plate cards +1, so that the cold air and the hot air are separated, namely relatively isolated and flow orderly.
As shown in fig. 4(a), 4(b) and 2, the automatic dustproof filter screen updating unit 40 includes a stepping motor power pack 410, a dustproof filter screen 140, a wind speed sensor 430, a driving shaft 440, a driven shaft 450, a driving belt x 2460 and a support frame 470; the signal processing main control unit 50 is connected with the stepping motor power pack 410 and the wind speed sensor 430, and the wind speed sensor 430 uploads the wind speed of the cooling air in the air inlet duct 210 to the signal processing main control unit 50;
the signal processing main control unit 50 is connected with the stepping motor power pack 410, and controls the stepping motor driving module 411 and the stepping motor driving module 411 of the stepping motor power pack 410 to drive the stepping motor 412 according to the wind speed of the cooling air in the air inlet duct 210 uploaded by the wind speed sensor 430, and the stepping motor 412 drives the driving shaft 440, the transmission belt x 2460 and the driven shaft 450 to execute the automatic updating operation of the dustproof filter screen 140; the models of the stepping motor driving module 411, the stepping motor 412 and the wind speed sensor 430 are SH-20806N, 35BYG250B-0081 and WD4001 respectively; the dustproof filter screen 140 is wound on the driven shaft 450, the stepping motor 411 of the stepping motor power pack 410 drives the driving shaft 440 to be connected with the driven shaft 450 through a transmission belt multiplied by 2460 at two ends of the shaft, and the dustproof filter screen 140 rotates along with the driven shaft 450 to complete the updating of the dustproof filter screen 140; the dust screen automatic renewing unit 40 is fixed to the cabinet 60 by means of the support bracket 470.
As shown in fig. 5(a), 5(b), and 5(c), the dustproof heat dissipation method flow of the controller cabinet on the subway vehicle includes a preparation flow of the dustproof heat dissipation method and an operation flow of the dustproof heat dissipation method;
description of variables
Atmospheric atmos
Positive pressure plus pressure + Δ p, Δ p > 0
Cabinet pressure cabin pressure
Operating temperature t
Normal operating temperature range, temperature _ normal
The upper limit working temperature interval upper limit operating temperature interval,
temperature_upperlimit
alarm operating temperature range of temperature _ alarm
temperature_alarm＞temperature_upperlimit＞
temperature_normal
Power consumption Q _ power _ displacement of controller on subway vehicle
Motor speed n
Speed of cooling air speed _ air
Normal speed n _ normal of motor
Normal wind speed _ air _ normal
Normal wind speed heat dissipation Q _ normal _ heatoutput,
upper limit speed n _ upper limit of motor
Upper limit wind speed _ air _ upper limit
Upper wind speed limit heat dissipation Q _ upper limit _ heatoutput
The alarming rotating speed n _ alarm of the motor, n _ alarm > n _ upper limit > n _ normal
Description of the Algorithm
Positive pressure state at subway vehicle-mounted controller cabinet
cabinet pressure≥plus pressure (1)
t∈temperature_normal
Normal speed n _ normal of motor, normal wind speed _ air _ normal
Normal wind speed heat dissipation Q _ normal _ heatoutput ≈ 4 × Power consumption Q _ power _ displacement
The actual wind speed _ air is less than or equal to 0.6 multiplied by the wind speed _ air _ normal, the dustproof filter screen 140 is updated (2)
t∈temperature_upperlimit
The upper limit speed n _ upper limit of the motor and the upper limit wind speed _ air _ upper limit of the motor
Upper limit wind speed heat dissipation Q _ upper limit _ heatoutput ≈ 8 × power dissipation Q _ power _ displacement
The actually measured wind speed _ air is less than or equal to 0.6 multiplied by the speed _ air _ upper limit, and the dustproof filter screen 140 is updated (3)
t∈temperature_alarm
Alarming rotating speed n _ alarm and alarming of motor
Positive pressure air suction to negative pressure air exhaust and motor reverse rotation
Remove the dust screen 140 (4)
Preparation process of dustproof heat dissipation method
Setting operation parameters of dustproof heat dissipation system
Positive pressure plus pressure ═ atmos + Δ p
Normal speed n _ normal of motor, normal wind speed _ air _ normal
The upper limit rotating speed n _ upper limit and the upper limit wind speed _ air _ upper limit of the motor
Motor alarm rotating speed n _ alarm
Second, detecting the cabinet pressure of the dustproof heat dissipation system
Normal speed n _ normal of motor
The cabinet pressure is read in through the air pressure sensor 120
if cabinet pressure＜plus pressure
Troubleshooting a cabinet 60 air-tight failure of a railcar-mounted controller
end
Operation flow of dustproof heat dissipation method
Firstly, the temperature t of the cabinet is collected, and the rotating speed of the motor is set
Case1 t ∈ temperature _ normal, n ═ n _ normal, turn-
Case2 t belongs to temperature _ upper limit, n-n _ upper limit, turn to third
Case3 t belongs to temperature _ alarm, n is n _ alarm, convert to
Second, collecting wind speed and updating dust-proof filter screen
if speed_air≤0.6×speed_air_normal
Rotating (c)
Collecting wind speed and updating dustproof filter screen
if speed_air≤0.6×speed_air_upper limit
Rotating (c)
Negative pressure heat radiation and alarm
Alarming and removing the dustproof filter screen 140
Motor reverse rotation, positive pressure air suction and negative pressure air exhaust
Rotating (c)
Fifthly, return to
Description 2: the corresponding relation between the rotating speed and the wind speed is obtained through calculation and actual measurement. The normal wind speed heat dissipation Q _ normal _ heatoutput ≈ 4 multiplied by the power consumption Q _ power _ dispersion, the upper limit wind speed heat dissipation Q _ upper limit _ heatoutput ≈ 8 multiplied by the power consumption Q _ power _ dispersion, and the upper limit of the environmental temperature is taken during the test.
Claims (2)
1. A dustproof heat dissipation system of a cabinet of a subway vehicle-mounted controller is characterized by comprising a positive-pressure dustproof heat dissipation unit (10) with a fan dustproof filter screen for filtering air inlet and air outlet of an air outlet, an airflow organization heat dissipation unit (20) with cold air and hot air separated and flowing in order, a heat pipe heat dissipation unit (30), a dustproof filter screen automatic updating unit (40) and a signal processing main control unit (50), wherein the dustproof heat dissipation system is embedded in the cabinet (60) of the subway vehicle-mounted controller; the signal processing main control unit (50) is respectively connected with the positive pressure dustproof heat dissipation unit (10) and the dustproof filter screen automatic updating unit (40);
the positive pressure dustproof heat dissipation unit (10) sucks cooling air filtered by a dustproof filter screen under the control of the signal processing main control unit (50); the airflow organization heat dissipation unit (20) guides sucked cooling air, the cooling air flows through the vehicle-mounted controller in order, absorbs heat generated by the vehicle-mounted controller, and the heat is discharged out of the cabinet (60) from an air outlet; the heat of the hot spot of the vehicle-mounted controller is directly led out of the cabinet (60) through the heat pipe radiating unit (30); under the control of the signal processing main control unit (50), the automatic dustproof filter screen updating unit (40) executes the automatic updating operation of the dustproof filter screen; the signal processing main control unit (50) takes an STM32F407 chip as a core;
the positive pressure dustproof heat dissipation unit (10) comprises a fan power pack (110), an air pressure sensor (120), a temperature sensor (130) and a dustproof filter screen (140), the signal processing main control unit (50) is respectively connected with the fan power pack (110), the air pressure sensor (120) and the temperature sensor (130) are installed on the inner side wall of the cabinet (60) and upload air pressure and temperature working condition parameters in the cabinet to the signal processing main control unit (50), and the models of the air pressure sensor (120) and the temperature sensor (130) are MS5535BM and DS18B20 respectively;
the signal processing main control unit (50) is connected with a fan power pack (110), a direct current brushless motor driving module (111) for controlling the fan power pack (110), a direct current brushless motor driving module (111) for driving a direct current brushless motor (112), and the direct current brushless motor (112) for driving a fan (113), wherein the fan (113) sucks external cooling air filtered by a dustproof filter screen (140), the cooling air enters an air inlet duct of the airflow organization heat dissipation unit (20), the dustproof filter screen (140) is made of polyurethane filter cotton, and the dustproof filter screen (140) is arranged at an air inlet of the fan; the fan power pack (110) is installed at the bottom of the side wall of the cabinet (60), and the models of the direct current brushless motor driving module (111), the direct current brushless motor (112) and the fan (113) are DBLS-01, 57BL-1010H1-LS-B and 614DGML respectively;
the airflow organization heat dissipation unit (20) comprises an air inlet duct (210), an air inlet outlet multiplied by 6 (220), an air outlet multiplied by 6 (230) and an air outlet dustproof net multiplied by 6 (240); the air inlet outlet (x 6) (220) consists of a 1 st air inlet outlet (221), a 2 nd air inlet outlet (222) and a 6 th air inlet outlet (226) which are sequentially increased, an air inlet air duct (210) is arranged at the bottom end of the cabinet (60), the air inlet outlet (x 6) (220) is formed by opening a hole on the air inlet air duct (210), and the air outlet direction of the air inlet outlet (x 6) (220) is parallel to the board card; the air outlet is multiplied by 6 (230), the air outlet dustproof net is multiplied by 6 (240) and the air inlet outlet is multiplied by 6 (220), the opening is positioned at the top end of the machine cabinet (60), and the air outlet dustproof net are assembled in a one-to-one corresponding mode; the number of the air inlet outlets = the number of the board cards +1, the air inlet outlets are positioned at the bottom end of the cabinet (60), between the two board cards or between the board cards and the side wall of the cabinet, and the air outlet is positioned at the top end of the cabinet (60), between the two board cards or between the board cards and the side wall of the cabinet; cooling air sucked by the fan power pack (110) is input into the air inlet duct (210), and the cooling air is distributed to each board card through an air inlet outlet multiplied by 6 (220) on the air inlet duct (210); cooling air flows through the plate cards in order to absorb heat generated by the plate cards, passes through an air outlet multiplied by 6 (230) and an air outlet dustproof net multiplied by 6 (240), and is discharged from the cabinet (60);
the heat pipe radiating unit (30) comprises a heat absorption copper plate (310), radiating fins (320) and heat pipes (330), wherein the heat pipes (330) consist of a 1 st heat pipe (331) and a 2 nd heat pipe (332); one end of the 1 st heat pipe (331) is contacted with a main processor radiator of the signal processing main control unit (50), the other end is contacted with a heat absorption copper plate (310), and the 2 nd heat pipe (332) is similar to the 1 st heat pipe (331) and conducts heat of a power supply power amplification pipe radiator; the heat radiating fins (320) are in contact with the heat absorbing copper plate (310);
the automatic updating unit (40) for the dustproof filter screen comprises a stepping motor power pack (410), the dustproof filter screen (140), a wind speed sensor (430), a driving shaft (440), a driven shaft (450), a transmission belt multiplied by 2 (460) and a support frame (470); the signal processing main control unit (50) is connected with the stepping motor power pack (410) and the wind speed sensor (430), and the wind speed sensor (430) uploads the wind speed of cooling air in the air inlet duct (210) to the signal processing main control unit (50);
the signal processing main control unit (50) is connected with a stepping motor power pack (410), a stepping motor driving module (411) of the stepping motor power pack (410) and a stepping motor driving module (411) are controlled to drive a stepping motor (412) according to the wind speed of cooling air uploaded to an air inlet duct (210) by a wind speed sensor (430), the stepping motor (412) drives a driving shaft (440), a transmission belt multiplied by 2 (460) and a driven shaft (450), and automatic updating operation of the dustproof filter screen (140) is executed; the models of the stepping motor driving module (411), the stepping motor (412) and the wind speed sensor (430) are SH-20806N, 35BYG250B-0081 and WD4001 respectively; the dustproof filter screen (140) is wound on the driven shaft (450), the stepping motor (411) of the stepping motor power pack (410) drives the driving shaft (440) to be connected with the driven shaft (450) through a transmission belt multiplied by 2 (460) at two ends of the shaft, and the dustproof filter screen (140) rotates along with the driven shaft (450) to finish the updating of the dustproof filter screen (140); the automatic dustproof filter screen updating unit (40) is fixed on the cabinet (60) by means of a support frame (470).
2. A dustproof heat dissipation method using the dustproof heat dissipation system according to claim 1, wherein the flow of the method comprises a preparation flow of the dustproof heat dissipation method, an operation flow of the dustproof heat dissipation method;
description of variables
Atmospheric atmos;
positive pressure plus pressure = atmos + Δ p, Δ p > 0;
cabinet pressure suppression;
operating temperature, t;
a normal working temperature interval normal operating temperature interval, temperature _ normal;
the upper limit working temperature interval upper limit operating temperature interval,
temperature_upperlimit；
alarm operating temperature range of temperature _ alarm
temperature_alarm＞temperature_upperlimit＞temperature_normal；
The power consumption Q _ power _ displacement of the subway vehicle-mounted controller;
the rotating speed n of the motor;
the wind speed _ air of the cooling air;
normal rotating speed n _ normal of the motor;
normal wind speed _ air _ normal;
normal wind speed heat dissipation Q _ normal _ heatoutput;
the upper limit rotating speed n _ upper limit of the motor;
the upper limit wind speed _ air _ upper limit;
the upper limit wind speed heat dissipation Q _ upper limit _ heatoutput;
the motor alarm rotating speed n _ alarm, n _ alarm > n _ upper limit > n _ normal;
the preparation process of the dustproof heat dissipation method comprises the following steps:
1-
setting the operation parameters of the dustproof heat dissipation system:
positive pressure plus pressure = atmos + Δ p to be an initial value,
the normal operating temperature interval temperature _ normal is assigned an initial value,
the upper limit operating temperature interval temperature _ upper limit is assigned to an initial value,
the alarm working temperature interval temperature _ alarm is assigned with an initial value,
the normal rotating speed n _ normal of the motor and the normal wind speed _ air _ normal are assigned with initial values,
the upper limit rotating speed n _ upper limit of the motor and the upper limit wind speed _ air _ upper limit are given as initial values,
the motor alarm rotating speed n _ alarm is assigned with an initial value,
heat dissipation Q _ normal _ heatoutput ≈ 4 × power consumption Q _ power _ displacement,
the heat dissipation Q _ upper limit _ heatoutput is approximately equal to 8 multiplied by the power consumption Q _ power _ displacement;
1-
the pressure of the cabinet of the dustproof heat dissipation system is detected,
at motor speed n = n _ normal,
the cabinet pressure is read in through the air pressure sensor (120),
if the caliber compression is greater than or equal to the plus compression,
1-turn-
；
If the binding pressure < plus pressure,
the air tightness fault of the subway vehicle-mounted controller cabinet (60) is eliminated, and 1-
；
1-
Finishing;
the operation flow of the dustproof heat dissipation method is as follows:
2-
collecting the cabinet temperature t, setting the rotating speed of the motor,
the temperature sensor (130) reads in the cabinet temperature t,
case1 t ∈ temperature _ normal, n = n _ normal, turn 2-
；
Case2 t ∈ temperature _ upper limit, n = n _ upper limit, go 2-
；
Case3 t ∈ temperature _ alarm, n = n _ alarmTurning to 2-
；
2-
Gather wind speed and dustproof filter screen and update:
the design parameters are the normal rotating speed n _ normal of the motor,
Normal wind speed _ air _ normal,
The heat dissipation Q _ normal _ heatoutput belongs to [ 3.8-4.2 ] multiplied by power consumption Q _ power _ displacement;
the wind speed sensor (430) reads in the wind speed _ air,
if speed _ air is less than or equal to 0.6 × speed _ air _ normal,
updating the dust-proof filter (140) by 2-
；
If speed _ air > 0.6 x speed _ air _ normal,
turn 2-
；
2-
Updating the dustproof filter screen in the upper limit working temperature interval:
the design parameters are the upper limit rotating speed n _ upper limit of the motor,
The upper limit wind speed _ air _ upper limit,
The heat dissipation Q _ upper limit _ heatoutput is approximately equal to 8 multiplied by the power consumption Q _ power _ displacement;
the wind speed sensor (430) reads in the wind speed _ air,
if speed _ air is less than or equal to 0.6 × speed _ air _ upper limit,
updating the dust-proof filter (140) by 2-
；
If speed _ air > 0.6 x speed _ air _ upper limit,
turn 2-
；
2-
Negative pressure heat dissipation and dustproof filter screen between the warning operating temperature interval remove:
the design parameters are motor alarm rotating speed n _ alarm and alarm,
the strategy for updating the dustproof filter screen is to change positive pressure suction into negative pressure exhaust and reverse rotation of a motor,
removing the dustproof filter screen (140);
2-
return 2-
。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910346148.3A CN110113916B (en) | 2019-04-26 | 2019-04-26 | Dustproof heat dissipation system and method for subway vehicle-mounted controller cabinet |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910346148.3A CN110113916B (en) | 2019-04-26 | 2019-04-26 | Dustproof heat dissipation system and method for subway vehicle-mounted controller cabinet |
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| CN110113916A CN110113916A (en) | 2019-08-09 |
| CN110113916B true CN110113916B (en) | 2020-12-08 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2387577Y (en) * | 1999-04-25 | 2000-07-12 | 赵毅 | Dust-proof case |
| JP2012066190A (en) * | 2010-09-22 | 2012-04-05 | Nec Corp | Dust filter automatic exchange apparatus, dust filter automatic exchange method, and program |
| CN105091929B (en) * | 2014-05-21 | 2019-07-02 | 中兴通讯股份有限公司 | A kind of detecting clogging of dust screen and system |
| CN204651972U (en) * | 2015-05-14 | 2015-09-16 | 特变电工西安电气科技有限公司 | A kind of ventilation and heat structure of outdoor direct charger |
| CN204827813U (en) * | 2015-07-31 | 2015-12-02 | 沈阳东安电力自动化有限责任公司 | Automatic dust collector of wind power generation heat exchanger and be equipped with its wind power generation system |
| CN105910264A (en) * | 2016-04-26 | 2016-08-31 | 华北水利水电大学 | Automatic adjusting device for filter screen of air conditioner outdoor unit |
| CN206273040U (en) * | 2016-12-13 | 2017-06-20 | 深圳市诚业通信技术有限公司 | A kind of IDC wind-cooling heat dissipatings rack |
| CN106855741B (en) * | 2016-12-29 | 2023-11-10 | 中国航天空气动力技术研究院 | Heat dissipation device and system for blade server chip |
| CN207625988U (en) * | 2017-12-02 | 2018-07-17 | 国网山西省电力公司信息通信分公司 | The pump drainage control device of cabinet |
| CN208227524U (en) * | 2018-04-16 | 2018-12-11 | 亿豪五金机电（深圳）有限公司 | A kind of cabinet ventilation device with labyrinth type water-proof function |
| CN208285700U (en) * | 2018-04-18 | 2018-12-25 | 中国舰船研究设计中心 | A kind of integration heat pipe-type radiating cabinet |
| CN108495538B (en) * | 2018-05-30 | 2023-11-14 | 特变电工西安电气科技有限公司 | High-power outdoor heat dissipation rack |
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