CN111561384A - Power pack cooling system, self-cleaning method and rail transit vehicle - Google Patents
Power pack cooling system, self-cleaning method and rail transit vehicle Download PDFInfo
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- CN111561384A CN111561384A CN202010431259.7A CN202010431259A CN111561384A CN 111561384 A CN111561384 A CN 111561384A CN 202010431259 A CN202010431259 A CN 202010431259A CN 111561384 A CN111561384 A CN 111561384A
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- 238000001816 cooling Methods 0.000 title claims abstract description 114
- 238000004140 cleaning Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000000428 dust Substances 0.000 claims abstract description 38
- 238000009825 accumulation Methods 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 230000008021 deposition Effects 0.000 claims abstract description 14
- 230000003068 static effect Effects 0.000 claims description 16
- 230000017525 heat dissipation Effects 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000033228 biological regulation Effects 0.000 abstract description 3
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 230000002706 hydrostatic effect Effects 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003670 easy-to-clean Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
- F01P11/06—Cleaning; Combating corrosion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
- F01P11/14—Indicating devices; Other safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P5/00—Pumping cooling-air or liquid coolants
- F01P5/02—Pumping cooling-air; Arrangements of cooling-air pumps, e.g. fans or blowers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/02—Controlling of coolant flow the coolant being cooling-air
- F01P7/04—Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses a power pack cooling system, a self-cleaning method and a rail transit vehicle, wherein the system judges whether a heat exchange device is in a dust accumulation state or not through pressure values of an air inlet side and an air outlet side of the heat exchange device, and when the heat exchange device is in the dust accumulation state, the air inlet side is changed into an air outlet side by controlling a cooling fan to rotate reversely, the air outlet side is changed into the air inlet side, dust and sundries in the heat exchange device are blown away, the self-cleaning of the heat exchange device is realized, and the stepless speed regulation of the cooling fan can be realized by monitoring the water temperature in a pipeline; the cooling system can monitor the dust deposition state of the heat exchange device in real time, can realize self-cleaning through the reverse rotation of the cooling fan, greatly improves the temperature control reliability of the cooling system, improves the maintenance convenience, effectively prolongs the maintenance period of the power pack, and has objective economic benefit.
Description
Technical Field
The invention belongs to the technical field of vehicle-mounted power pack cooling, and particularly relates to a power pack cooling system, a self-cleaning method and a rail transit vehicle.
Background
In recent years, research on novel transportation rail vehicles is deepened in various countries around the world, and the assumption that diesel-electric multiple units are proposed successively by the U.S. department of transportation, the siemens group of germany and the pombodi group of canada is that a hybrid power system is formed by combining energy storage elements with high-power diesel engines, and a diesel engine-generator set (also called an internal combustion power pack) and the energy storage system are used for providing traction force during acceleration.
In order to ensure stable output of traction force, the diesel engine-generator set needs to work at a proper temperature, and an independent cooling heat exchange system is generally arranged for cooling the working diesel engine-generator set. A common cooling and heat exchange system comprises a power pack cooling system, wherein the power pack cooling system generally adopts a hydrostatic system and mainly comprises a diesel engine cooling water system, a pressurized air cooling system and a hydrostatic system. The diesel engine cooling water system is used for cooling a diesel engine and a generator and mainly comprises a water pump, a thermostat, a water radiator, an expansion water tank, a water pipeline and the like. The diesel engine charge air cooling system is used for cooling charge air and mainly comprises a charge air cooler, an air pipeline and the like. The hydrostatic system is used for driving a cooling fan and cooling hydrostatic oil and mainly comprises a hydrostatic pump, a hydrostatic motor, the cooling fan, an oil radiator, a controller, an oil tank, a hydraulic pipeline and the like.
Because the operation environment of the rail transit vehicle is outdoor, outdoor dust cannot be avoided, and trees along the rail are more crowded, for the vehicle which runs outdoors for a long time, when a cooling system of the vehicle works for a long time, dust is more easily accumulated in the heat exchanger (such as a water radiator and an air cooler), and the surface of the fin is easy to absorb sundries such as leaves, so that the heat exchange efficiency is reduced and the power pack runs at an over-temperature. The existing power pack cooling system has the advantages that the dust deposition state of a heat exchange device cannot be monitored, a cooling fan mostly adopts a hydraulic fan incapable of independently regulating the speed, and in maintenance, intermittent cleaning maintenance is carried out according to operation experience, the abnormal temperature rise fault of the cooling system easily occurs in vehicle operation, and the problems that the heat exchange device is not easy to clean after being blocked exist.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a power pack cooling system, a self-cleaning method and a rail transit vehicle, and aims to solve the problems that the dust accumulation state of a heat exchange device in the prior art cannot be monitored and the like.
The invention solves the technical problems through the following technical scheme: a power pack cooling system comprising:
the heat exchange device is connected with the heat dissipation port of the power pack through a pipeline;
the first pressure difference sensor and the second pressure difference sensor are respectively arranged on the air inlet side and the air outlet side of the heat exchange device and are respectively used for detecting the static pressure values of the air inlet side and the air outlet side of the heat exchange device in real time;
the cooling fan is arranged on the exhaust side of the heat exchange device, and the cooling fan rotates forwards during heat exchange to suck external cold air into the heat exchange device so as to realize heat exchange in the heat exchange device; during self-cleaning, the reverse rotation is used for blowing out accumulated dust and sundries in the heat exchange device;
the frequency converter is electrically connected with the cooling fan;
and the control device is used for judging whether the heat exchange device is in a dust deposition state according to the static pressure values of the air inlet side and the air outlet side of the heat exchange device, and controlling the action of the cooling fan according to the judgment result to realize the heat exchange and self cleaning of the heat exchange device.
The cooling system of the invention respectively detects the pressure values of the air inlet side and the air outlet side of the heat exchange device in real time, and judges the dust deposition state of the heat exchange device through the pressure difference between the air inlet side and the air outlet side, when the pressure difference is larger than or equal to a critical value, the control device controls the cooling fan to rotate reversely, so that the air inlet side of the heat exchange device is changed into the air outlet side, the air outlet side is changed into the air inlet side, and the dust deposition and sundries on the heat exchange device are blown out, thereby achieving the purpose of self-cleaning of the cooling system, enabling the power pack cooling system to be in a high-efficiency and stable working state, and ensuring the normal.
Further, the cooling fan comprises a first cooling fan and a second cooling fan, the frequency converter comprises a first frequency converter and a second frequency converter, and the first frequency converter and the second frequency converter are respectively electrically connected with the first cooling fan and the second cooling fan.
The two cooling fans are arranged to provide enough cold air for heat exchange in the heat exchange device, so that the heat exchange efficiency is improved, the normal and stable operation of the diesel engine-generator set is ensured, meanwhile, enough wind power can be provided during self-cleaning, the cleaning speed and the cleaning thoroughness of accumulated dust and sundries are improved, the heat exchange device is quickly restored to a non-accumulated dust state, the diesel engine-generator set is made to work in a proper temperature range, and the normal and stable operation of the diesel engine-generator set is further ensured.
Furthermore, the system also comprises a temperature sensor arranged in the pipeline, and the temperature sensor is electrically connected with the control device and used for detecting the water temperature in the pipeline.
The invention also provides a self-cleaning method of the power pack cooling system, which comprises the following steps:
step 1: acquiring static pressure values of an air inlet side and an air outlet side of a heat exchange device;
step 2: judging whether the system is in a dust accumulation state or not according to the static pressure values of the air inlet side and the air exhaust side in the step 1;
and step 3: when the system is in a non-dust-accumulation state, the cooling fan rotates forwards, and external cold air is sucked into the heat exchange device to realize heat exchange; when the system is in a dust accumulation state, the cooling fan rotates reversely, the air inlet side of the heat exchange device is changed into the air exhaust side, and the air exhaust side is changed into the air inlet side, so that the self-cleaning of the heat exchange device is realized.
Further, in the step 2, a specific method for determining the dust deposition state is as follows:
when the difference between the static pressure values of the air inlet side and the air outlet side is greater than or equal to a critical value, the heat exchange device is in a dust accumulation state;
when the difference between the static pressure values of the air inlet side and the air outlet side is smaller than a critical value, the heat exchange device is in a non-dust-deposition state;
the critical value is 120% of the standard resistance value.
Further, in the step 3, when the system is in a non-dust-accumulation state and the temperature of water in the pipeline is 85-90 ℃, the rotating speed of the cooling fan is 1200-1800 r/min;
when the system is in a dust accumulation state, the cooling fan works at full speed, and the self-cleaning efficiency is improved.
The invention further provides a rail transit vehicle which comprises the power pack cooling system.
Advantageous effects
Compared with the prior art, the invention provides a power pack cooling system and a self-cleaning method, whether the heat exchange device is in a dust deposition state is judged through pressure values of the air inlet side and the air outlet side of the heat exchange device, and when the heat exchange device is in the dust deposition state, the air inlet side is changed into the air outlet side by controlling the cooling fan to rotate reversely, the air outlet side is changed into the air inlet side, dust and sundries deposited on the heat exchange device are blown away, the self-cleaning of the heat exchange device is realized, and the stepless speed regulation of the cooling fan can be realized by monitoring the water temperature in a pipeline; the cooling system can monitor the dust deposition state of the heat exchange device in real time, can realize self-cleaning through the reverse rotation of the cooling fan, greatly improves the temperature control reliability of the cooling system, improves the maintenance convenience, effectively prolongs the maintenance period of the power pack, and has objective economic benefit.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only one embodiment of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic diagram of a power pack cooling system according to an embodiment of the present invention;
FIG. 2 is a control logic diagram of a power pack cooling system in an embodiment of the present invention;
the system comprises a heat exchange device 1, a first cooling fan 2, a second cooling fan 3, a second differential pressure sensor 4, a first frequency converter 5, a second frequency converter 6, a control device 7 and a pipeline 8.
Detailed Description
The technical solutions in the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the power pack cooling system provided by the invention comprises a heat exchange device 1, a first differential pressure sensor, a second differential pressure sensor 4, a first cooling fan 2, a second cooling fan 3, a first frequency converter 5, a second frequency converter 6, a temperature sensor and a control device 7; the first differential pressure sensor and the second differential pressure sensor 4 are respectively arranged on the air inlet side (front end) and the air exhaust side (rear end) of the heat exchange device 1, the first cooling fan 2 and the second cooling fan 3 are both arranged on the air exhaust side of the heat exchange device 1, and the temperature sensor is arranged in a pipeline 8 which is communicated with the heat dissipation port of the power pack and the heat exchange device 1; the first differential pressure sensor, the second differential pressure sensor 4, the first frequency converter 5, the second frequency converter 6 and the temperature sensor are respectively and electrically connected with the control device 7, the first cooling fan 2 and the second cooling fan 3 are respectively and electrically connected with the first frequency converter 5 and the second frequency converter 6, and the first frequency converter 5 and the second frequency converter 6 are respectively arranged near the first cooling fan 2 and the second cooling fan 3.
The cooling system of the invention detects the static pressure values of the air inlet side and the air outlet side of the heat exchange device 1 respectively in real time, and judges the dust deposition state of the heat exchange device 1 according to the difference between the static pressure values of the air inlet side and the air outlet side, when the pressure difference is greater than or equal to a critical value, the control device 7 controls the cooling fan to rotate reversely, so that the air inlet side of the heat exchange device 1 is changed into the air outlet side, the air outlet side is changed into the air inlet side, and the dust deposition and sundries on the heat exchange device 1 are blown out, thereby achieving the purpose of self-cleaning of; when the pressure difference is smaller than the critical value, the cooling fan rotates forwards, the heat exchange device 1 is in a normal heat exchange state, and meanwhile, the pressure difference sensor monitors the state of the heat exchange device 1 in real time, as shown in fig. 2; the system comprises two cooling fans, when the system is in self-cleaning, the cooling fans work at full speed, so that the system can quickly finish self-cleaning and recover to a heat exchange state, the power pack cooling system is in a high-efficiency and stable working state, the maintenance period of the power pack is effectively prolonged, and the diesel engine-generator set can normally and stably operate. The system can also adjust the rotating speed of the cooling fan according to the water temperature in the pipeline, when the water temperature is high, the amount of cold air required by heat exchange is large, the rotating speed of the cooling fan is increased, the suction of external cold air is promoted, and the heat exchange efficiency is improved; when the water temperature is low, the amount of cold air required by heat exchange is small, the rotating speed of the cooling fan is reduced, and energy conservation and noise reduction are realized, so that stepless speed regulation of the cooling fan can be realized according to the water temperature in the pipeline, and the rotating speed of the cooling fan is adapted to the cold air required by heat exchange (namely, the ventilation air volume of the heat exchange device 1 is adjusted in real time according to the water temperature).
In this embodiment, the critical value for judging the dust accumulation state is 120% of the standard resistance value, which is the resistance value of the heat exchange device that is not used (or shipped from a factory without dust and impurities),the threshold value is set according to vehicle operation experience. The control device selects a controller with Siemens PLC S7-200SMART CPU series chips as a core, the frequency converter selects an ATV610U55N4 type frequency converter, the pressure difference sensor selects a CYH-130 type pressure difference sensor, the temperature sensor selects an HSTL-103 type temperature sensor, the first cooling fan and the second cooling fan both select a Schlengberg axial flow fan, and the rated air volume of the first cooling fan and the second cooling fan is 6500m3/h。
In this embodiment, the control device includes a display screen, and the display screen is used to display the state of the heat exchanging device and the rotation speed of the cooling fan (dust deposition state (blocked state), non-dust deposition state), set relevant parameters (such as a critical value, a water temperature range, a corresponding rotation speed of the cooling fan, and the like), and relevant operation buttons (such as a self-cleaning button, which can be triggered by a manual operation to reverse the cooling fan to perform self-cleaning of the system).
The control device adjusts the rotating speed of the cooling fan according to the water temperature and the dust accumulation state, and specifically comprises the following steps:
when the heat exchange device is in a non-dust-accumulation state and the water temperature in the pipeline is 85-90 ℃, the rotating speed of the cooling fan is 1200 r/min-1800 r/min; when the heat exchange device is in a dust accumulation state, the cooling fan works at full speed, self-cleaning of the heat exchange device is accelerated, and the heat exchange device is enabled to quickly return to the heat exchange working state.
The rotating speed of the cooling fan corresponding to the water temperature in the pipeline is set according to the heating value and experience of the diesel engine, for example, the heating value emitted when the diesel engine runs at the maximum power is the maximum heating value, the maximum heating value corresponds to the maximum water temperature of 90 ℃, when the water temperature is 90 ℃, the fin area of the heat exchange device is calculated according to the space of the heat radiation fins of the heat exchange device and the heat conduction coefficient of the fins (the prior art), the air quantity required by the cooling fan is equal to the air speed and the fin area, and the cooling fan corresponding to the brand and the installation size can be selected according to the air quantity. In this embodiment, the cooling fan is a Schlengberg axial flow fan, the specific model of which is an m131c1000 improved type, and the rated air volume is 6500m3/h。
As shown in fig. 2, the present invention further provides a self-cleaning method for a power pack cooling system, comprising:
step 1: acquiring static pressure values of an air inlet side and an air outlet side of a heat exchange device;
step 2: judging whether the system is in a dust accumulation state or not according to the static pressure values of the air inlet side and the air exhaust side in the step 1;
when the difference between the static pressure values of the air inlet side and the air outlet side is greater than or equal to a critical value, the heat exchange device is in a dust accumulation state;
when the difference between the static pressure values of the air inlet side and the air outlet side is smaller than a critical value, the heat exchange device is in a non-dust-deposition state;
the critical value is 120% of the standard resistance value;
and step 3: when the system is in a non-dust-accumulation state, the cooling fan rotates forwards, and external cold air is sucked into the heat exchange device to realize heat exchange; when the system is in a dust accumulation state, the cooling fan rotates reversely, the air inlet side of the heat exchange device is changed into the air exhaust side, and the air exhaust side is changed into the air inlet side, so that the self-cleaning of the heat exchange device is realized.
The invention further provides a rail transit vehicle which comprises the power pack cooling system.
The above disclosure is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of changes or modifications within the technical scope of the present invention, and shall be covered by the scope of the present invention.
Claims (7)
1. A power pack cooling system, comprising:
the heat exchange device (1) is connected with a heat dissipation port of the power pack through a pipeline (8);
the first differential pressure sensor and the second differential pressure sensor (4) are respectively arranged on the air inlet side and the air outlet side of the heat exchange device (1);
the cooling fan is arranged on the air exhaust side of the heat exchange device (1);
the frequency converter is electrically connected with the cooling fan;
and the control device (7) is respectively and electrically connected with the first differential pressure sensor, the second differential pressure sensor (4) and the frequency converter.
2. The power pack cooling system of claim 1, wherein: the cooling fan comprises a first cooling fan (2) and a second cooling fan (3), the frequency converter comprises a first frequency converter (5) and a second frequency converter (6), and the first frequency converter (5) and the second frequency converter (6) are respectively electrically connected with the first cooling fan (2) and the second cooling fan (3).
3. A power pack cooling system as claimed in claim 1 or 2, wherein: the system also comprises a temperature sensor arranged in the pipeline (8), and the temperature sensor is electrically connected with the control device (7).
4. A method of self-cleaning a power pack cooling system, comprising:
step 1: acquiring static pressure values of an air inlet side and an air outlet side of a heat exchange device;
step 2: judging whether the system is in a dust accumulation state or not according to the static pressure values of the air inlet side and the air exhaust side in the step 1;
and step 3: when the system is in a non-dust-accumulation state, the cooling fan rotates forwards, and external cold air is sucked into the heat exchange device to realize heat exchange; when the system is in a dust accumulation state, the cooling fan rotates reversely, the air inlet side of the heat exchange device is changed into the air exhaust side, and the air exhaust side is changed into the air inlet side, so that the self-cleaning of the heat exchange device is realized.
5. A method of self-cleaning a power pack cooling system as claimed in claim 4, wherein: in the step 2, the specific method for judging the dust deposition state is as follows:
when the difference between the static pressure values of the air inlet side and the air outlet side is greater than or equal to a critical value, the heat exchange device is in a dust accumulation state;
when the difference between the static pressure values of the air inlet side and the air outlet side is smaller than a critical value, the heat exchange device is in a non-dust-deposition state;
the critical value is 120% of the standard resistance value.
6. A method of self-cleaning a power pack cooling system as claimed in claim 4, wherein: in the step 3, when the system is in a non-dust-accumulation state and the water temperature in the pipeline is 85-90 ℃, the rotating speed of the cooling fan is 1200-1800 r/min;
when the system is in the dust-laden state, the cooling fan operates at full speed.
7. A rail transit vehicle characterized by: comprising a power pack cooling system according to any of claims 1-3.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010431259.7A CN111561384A (en) | 2020-05-20 | 2020-05-20 | Power pack cooling system, self-cleaning method and rail transit vehicle |
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| CN202010431259.7A CN111561384A (en) | 2020-05-20 | 2020-05-20 | Power pack cooling system, self-cleaning method and rail transit vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112963236A (en) * | 2021-02-22 | 2021-06-15 | 三一重机有限公司 | Engine cooling system, and control method and device of engine cooling system |
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| CN206889079U (en) * | 2017-07-19 | 2018-01-16 | 宝鸡中车时代工程机械有限公司 | Engine of engineering vehicle radiator with motor-driven fan |
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| CN110318855A (en) * | 2019-07-03 | 2019-10-11 | 山推工程机械股份有限公司 | A kind of cooling system and its control method |
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| CN112963236A (en) * | 2021-02-22 | 2021-06-15 | 三一重机有限公司 | Engine cooling system, and control method and device of engine cooling system |
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