CN110567739B - Method and device for rapidly detecting heat dissipation state of radiator - Google Patents
Method and device for rapidly detecting heat dissipation state of radiator Download PDFInfo
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- CN110567739B CN110567739B CN201910641600.9A CN201910641600A CN110567739B CN 110567739 B CN110567739 B CN 110567739B CN 201910641600 A CN201910641600 A CN 201910641600A CN 110567739 B CN110567739 B CN 110567739B
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- G—PHYSICS
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Abstract
The invention discloses a method and a device for quickly detecting the heat dissipation state of a radiator, wherein the method comprises the following steps: firstly, establishing a quick detection device for the heat dissipation state of a radiator, and realizing real-time calculation of power loss of a power device by a software method; secondly, calculating to obtain a first thermal resistance of the radiator by utilizing the power loss of the power device obtained by real-time calculation through the relationship among the temperature rise of the radiator of the converter device, the thermal resistance of the radiator and the power loss of the power device of the converter device; and quickly judging the steady-state value of the thermal resistance according to the first thermal resistance change slope of the radiator, and then obtaining the heat dissipation state of the radiator of the converter at the moment according to the corresponding relation between the steady-state value of the thermal resistance and the heat dissipation state of the radiator. The invention quickly judges the blockage degree of the radiator by monitoring the thermal resistance change slope of the radiator of the converter device, is an online intelligent quick detection method, and realizes the quick detection of the blockage degree of the radiator by software programming by only utilizing the existing sensor of the converter device.
Description
Technical Field
The invention relates to the field of rail transit, in particular to a method and a device for quickly detecting the heat dissipation state of a radiator of a converter.
Background
The converter is a core device of a rail transit vehicle and is an important component of a traction power supply system of the rail transit vehicle, the radiator is used as an important component for heat dissipation of the converter, and evaluation of the heat dissipation state of the converter is important work for ensuring safe and reliable operation of the converter.
For a long time, an intelligent rapid detection method is not available for the heat dissipation state of the radiator, and at present, in order to ensure the normal and reliable work of the converter device, a regular cleaning and maintenance mode is generally adopted, but regular monitoring is blind, so that the problems of under-maintenance and over-maintenance exist in the cleaning and maintenance of the radiator. In order to solve the problem, the invention provides an intelligent method for rapidly detecting the heat dissipation state of the radiator, which can realize rapid detection of the heat dissipation state of the radiator by only using the existing sensor of the converter on the premise of not adding a sensor and not changing the structure of the converter.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method and a device for quickly detecting the heat dissipation state of a radiator, so that the quick detection and evaluation of the heat dissipation state of the radiator are realized.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
a method for rapidly detecting the heat dissipation state of a radiator comprises the following steps:
calculating the power loss of the power device according to the ratio of the power loss of the power device to the input active power of the converter device;
and 4, searching the corresponding relation between the thermal resistance steady state value and the heat dissipation state of the heat radiator according to the thermal resistance steady state value, and quickly judging the heat dissipation state of the heat radiator, namely the blockage degree of the heat radiator.
On the basis of the above scheme, in step 1, a calculation formula of the input active power of the converter device is shown as follows:
when the converter is a rectifier, the input active power is as follows:
Po＝Udc·Idc(1)
when the converter is an inverter, the input active power is as follows:
wherein, P0Inputting active power, U, to the converterdcIs the DC side voltage of the converter device, IdcIs the direct side current of a converter device, UaIs the effective value of A phase voltage at the AC side of the converter, IaThe effective value of the A phase current at the AC side of the converter,
is the power factor angle.
On the basis of the above scheme, in step 1, the power device power loss calculation formula is:
Ploss＝P0·K (3)
wherein, PlossAnd K is the ratio of the power loss of the power device to the active power at the input side of the converter device, and is obtained according to the energy efficiency curve of the converter device.
On the basis of the above scheme, in step 2, determining a first thermal resistance according to the first temperature, the second temperature and the power loss of the power device, specifically:
taking the difference value between the first temperature and the second temperature as the temperature rise of the radiator, namely a third difference value; determining the ratio of the third difference value to the power loss of the power device as a first thermal resistance R, wherein the calculation formula is as follows:
wherein, T1Is a first temperature, T0Is the second temperature, Δ T is the third difference, PlossThe power loss of the power device of the converter is shown.
On the basis of the scheme, in step 3, a thermal resistance change slope is obtained according to the transient state change trend of the first thermal resistance, and a calculation formula of the thermal resistance change slope is as follows:
wherein, t1、t2Are respectively two adjacent moments in the first thermal resistance change process, R11Is t1Thermal resistance value, R, corresponding to time21Is t2And (4) the thermal resistance value corresponding to the moment, and k is the thermal resistance change slope.
On the basis of the scheme, the corresponding relation between the thermal resistance change slope and the thermal resistance steady-state value and the corresponding relation between the thermal resistance steady-state value and the heat dissipation state of the radiator are obtained through experimental data.
The invention provides a quick detection device for the heat dissipation state of a radiator, which comprises: the device comprises an acquisition module, a first determination module, a second determination module, a third determination module and a fourth determination module;
the acquisition module comprises a temperature sensor, a current sensor and a voltage sensor and is used for acquiring the temperature of the radiator, the temperature of an air inlet of the radiator and the direct current I of the direct current side of the converterdcDC side voltage U of converterdcEffective value I of A-phase current at AC side of converteraAC side A phase voltage effective value U of convertera(ii) a The temperature of the radiator is a first temperatureThe temperature of the air inlet of the heater is a second temperature;
the first determining module is connected with the obtaining module and is used for obtaining the direct-current side current I of the converter device through the obtaining moduledcDC side voltage U of converterdcEffective value I of A-phase current at AC side of converteraAC side A phase voltage effective value U of converteraCalculating the input active power of the converter device; then calculating the power loss of the power device according to the ratio of the power loss of the power device to the input active power of the converter device;
the second determining module is connected with the obtaining module and the first determining module and is used for determining a first thermal resistance according to the first temperature, the second temperature and the power loss of the power device of the converter device;
the third determining module is connected with the second determining module and used for obtaining a thermal resistance change slope according to the transient state change trend of the first thermal resistance and quickly determining a steady-state value of the thermal resistance of the radiator according to the first sample data; the first sample data is sample data of the corresponding relation between the thermal resistance change slope and the thermal resistance steady-state value in a specific time period;
the fourth determining module is connected with the third determining module and used for rapidly determining the heat dissipation state of the radiator according to the thermal resistance steady-state value obtained by the third determining module and by combining second sample data; the second sample data is sample data of a corresponding relation between a steady-state value of thermal resistance and a heat dissipation state of the heat sink.
On the basis of the scheme, the first determining module has a corresponding storage function and a corresponding calculation function and is used for storing a power loss calculation program of the power device.
On the basis of the above scheme, the third determining module is further configured to store a corresponding relationship between a thermal resistance change slope and a thermal resistance steady-state value.
On the basis of the above scheme, the fourth determining module is further configured to store a correspondence between a steady-state value of the thermal resistance and a heat dissipation state of the heat sink.
The invention relates to a method for rapidly detecting the heat dissipation state of a radiator, which is characterized in that when the blockage degree of the radiator needs to be determined, a first thermal resistance is determined according to a first temperature and a second temperature of the radiator and the power loss of a power device of a converter, a steady state value of the thermal resistance of the radiator is determined in a sample database according to the corresponding relation between the thermal resistance change slope and the steady state value of the thermal resistance, then the heat dissipation state of the radiator is determined in the sample database according to the corresponding relation between the steady state value of the thermal resistance and the heat dissipation state, and sample data in the sample database can truly reflect the corresponding relation between the steady state value of the thermal resistance and the. Therefore, the heat dissipation state of the heat sink can be obtained through calculation of the first thermal resistance and support of an experimental database.
Drawings
The invention has the following drawings:
fig. 1 is a schematic structural diagram of a heat sink according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a method for rapidly detecting a heat dissipation state of a heat sink according to an embodiment of the present invention.
Fig. 3 is a schematic diagram i for rapidly determining a steady-state value of thermal resistance according to a thermal resistance change slope in a thermal resistance transient process of a heat sink according to an embodiment of the present invention.
Fig. 4 is a schematic diagram ii illustrating that a steady-state value of thermal resistance is rapidly determined according to a thermal resistance change slope in a thermal resistance transient process of a heat sink due to sudden blockage during a working process of the heat sink according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of a device for rapidly detecting a heat dissipation state of a heat sink of an inverter according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 to 5 in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all 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.
Fig. 1 is a schematic structural diagram of the heat sink provided by the present invention, and as shown in fig. 1, the heat sink includes a heat dissipation substrate 1, heat dissipation fins 2, an air cooling channel 3, and a fan 4.
The heat generated by the converter is diffused to the radiating fins 2 from the radiating base plate 1, and the fan 4 generates strong convection air, so that the heat on the radiating fins 2 is diffused to the air through the air cooling channel 3.
In practice, a large amount of dust is easily adhered to the heat dissipation fins 2 of the heat sink in the converter, which causes the heat dissipation state of the heat sink to decrease, and affects the heat dissipation effect of the converter, and the heat dissipation state of the heat sink decreases in two ways: firstly, a large amount of dust is adhered to the heat dissipation fins 2 of the heat dissipater, and the heat conductivity coefficient of the dust is 3 orders of magnitude lower than that of the heat dissipation fins 2, so that the heat resistance of the heat dissipater is increased, and the heat dissipation performance is reduced; secondly, the effective ventilation area of the ventilation opening is reduced due to the local blockage of the air inlet, so that the flow of the coolant passing through the air duct of the radiator is reduced, and the heat dissipation state is deteriorated. In order to accurately determine the heat dissipation state of the heat sink, the invention provides a method for rapidly detecting the heat dissipation state of the heat sink, which is specifically shown in fig. 2.
Fig. 2 is a schematic diagram of a method for rapidly detecting a heat dissipation state of a heat sink according to an embodiment of the present invention, as shown in fig. 2, including:
the implementation of the embodiment of the invention can be realized by software, or by the combination of software and hardware, and the method for determining the blockage degree of the radiator is realized by software programming and by the combination of software and hardware.
When the degree of blockage of the radiator needs to be determined, the technical scheme shown in fig. 2 may be executed, or the technical scheme shown in fig. 2 may be periodically executed according to a preset execution cycle.
The first temperature and the second temperature of the radiator can be obtained through the temperature sensor of the radiator.
When the converter is a rectifier, the voltage is based on the DC side voltage U of the converterdcDirect side current I of current transformerdcAnd calculating the power loss of the power device through a corresponding power loss calculation algorithm.
When the converter is an inverter, the effective value U of the A-phase voltage of the AC side of the converter is determined according to the effective value U of the A-phase voltage of the AC side of the converteraEffective value I of A-phase current on alternating current side of converteraAnd calculating the power loss of the power device through a corresponding power loss calculation algorithm.
And determining the first thermal resistance of the radiator according to the first temperature, the second temperature and the power loss of the power device of the converter.
And obtaining a slope change curve of the first thermal resistance according to the transient change trend of the first thermal resistance of the radiator, and quickly judging the thermal resistance steady-state value of the radiator according to the corresponding relation between the slope of the first thermal resistance and the thermal resistance steady-state value in the database.
And according to the heat resistance steady state value of the heat radiator obtained by judgment, and according to the corresponding relation between the heat resistance steady state value in the database and the heat radiation state of the heat radiator, quickly judging the heat radiation state of the heat radiator.
For example: assuming that the first temperature is T1The second temperature is T0The third difference is delta T, and the power loss of the power device of the converter is PlossThe first thermal resistance is R. Then T1、T0、△T、PlossThe following correspondence exists between R:
and calculating the thermal resistance change slope in a period of time in the first thermal resistance change process, and quickly judging the steady-state value of the thermal resistance.
For example: t1 and t2 are two moments in the first thermal resistance change process respectively, R11 is a thermal resistance value corresponding to the t1 moment, R21 is a thermal resistance value corresponding to the t2 moment, the thermal resistance slope is represented by k, wherein k1, k2, … and kn correspond to different thermal resistance change slopes, and the corresponding relationship is as follows:
and then, quickly judging the steady-state value of the thermal resistance and the heat dissipation state of the radiator according to the change slope of the thermal resistance.
Fig. 3 is a schematic diagram i of rapidly determining a steady-state value of thermal resistance according to a thermal resistance change slope in a thermal resistance transient process of a heat sink according to an embodiment of the present invention, as shown in fig. 3, a corresponding relationship between the thermal resistance change slope, the steady-state value of thermal resistance, and a heat dissipation state of the heat sink is obtained through experiments.
For example: the steady state value of the thermal resistance is R2 and the transient change slope of the thermal resistance is k1 under the 100% heat dissipation state; under the 80% heat dissipation state, the steady state value of the thermal resistance is R3, and the transient change slope of the thermal resistance is k 2; the steady state value of the thermal resistance in the 40% heat dissipation state is R4, and the transient change slope of the thermal resistance is k 3; the steady state value of the thermal resistance in a 10% heat dissipation state is R5, and the transient change slope of the thermal resistance is k 4. If the calculated thermal resistance change slope is k2, the steady state value of the thermal resistance can be quickly predicted to be R3, and the heat dissipation state of the radiator at the moment is determined to be 80%. And if the detected thermal resistance change slope is between k1 and k2, judging the heat dissipation state of the heat sink at the moment to be between 80 and 100 percent.
Fig. 4 is a schematic diagram ii illustrating that a thermal resistance steady-state value is rapidly determined according to a thermal resistance change slope in a thermal resistance transient process of the heat sink due to sudden blockage in a working process of the heat sink according to the embodiment of the present invention, as shown in fig. 4, after the heat sink reaches the thermal resistance steady-state value, a corresponding relationship between the thermal resistance change slope, the thermal resistance steady-state value, and a heat dissipation state of the heat sink is obtained through experiments.
For example: the steady state value of the thermal resistance is R2 and the transient change slope of the thermal resistance is k1 under the 100% heat dissipation state; the sudden blockage causes that the heat radiator has a thermal resistance steady state value of R3 and a thermal resistance transient change slope of k5 in an 80% heat radiation state; the sudden blockage causes the steady-state value of the thermal resistance of the heat radiator in a 40% heat radiation state to be R4, and the transient change slope of the thermal resistance to be k 6; the sudden blockage results in the steady-state value of the thermal resistance of the heat sink in a 10% heat dissipation state being R5 and the transient change slope of the thermal resistance being k 7. If the thermal resistance is suddenly blocked after a period of time when reaching the steady state value, the calculated thermal resistance change slope is k5, the steady state value of the thermal resistance can be quickly predicted to be R3, and the heat dissipation state of the radiator at the moment is judged to be 80%. If the detected thermal resistance slope is between two adjacent slopes, the heat radiator is judged to be in a heat radiation state between two adjacent heat radiation states. The division of the heat dissipation state can be performed at intervals of 10% or 20% according to the actual requirements of the project.
When the heat dissipation state of the heat radiator needs to be determined quickly, the first thermal resistance is determined according to the first temperature, the second temperature and the power loss of a power device of the converter, then the thermal resistance change slope is calculated, the corresponding relation between the thermal resistance change slope and the thermal resistance steady state value of the heat radiator is searched in a database, the thermal resistance steady state value of the heat radiator is obtained, then the corresponding relation between the thermal resistance steady state and the heat dissipation state of the heat radiator is searched in the database, and the heat dissipation state of the heat radiator at the moment can be judged.
In the process of determining the degradation degree of the heat radiation performance of the radiator, the heat radiation state of the radiator is determined without manual observation, intelligent and quick detection can be realized only by utilizing the existing sensor of the converter device and combining software and hardware and programming programs, so that the cost of manual detection is saved, and the detection efficiency and accuracy are improved. The method for determining the heat dissipation state of the radiator disclosed by the invention does not depend on manual observation any more, so that the method for determining the heat dissipation state of the radiator disclosed by the invention can be applied to radiators with any structures, and the method for determining the heat dissipation performance of the radiator disclosed by the invention has universality.
Fig. 5 is a schematic diagram of a device for rapidly detecting a heat dissipation state of a heat sink of an inverter according to an embodiment of the present invention. As shown in fig. 5, the apparatus may include an obtaining module, a first determining module, a second determining module, a third determining module, and a fourth determining module, wherein,
the acquisition module comprises a temperature sensor, a current sensor and a voltage sensor and is used for acquiring the temperature of the radiator, the temperature of an air inlet of the radiator and the direct current I of the direct current side of the converterdcDC side voltage U of converterdcEffective value I of A-phase current at AC side of converteraAC side A phase voltage effective value U of convertera(ii) a The temperature of the radiator is a first temperature, and the temperature of an air inlet of the radiator is a second temperature;
the first isThe determining module is connected with the obtaining module and used for obtaining the direct current I on the direct current side of the converter device through the obtaining moduledcDC side voltage U of converterdcEffective value I of A-phase current at AC side of converteraAC side A phase voltage effective value U of converteraCalculating the input active power of the converter device; then calculating the power loss of the power device according to the ratio of the power loss of the power device to the input active power of the converter device;
the second determining module is connected with the obtaining module and the first determining module and is used for determining a first thermal resistance according to the first temperature, the second temperature and the power loss of the power device of the converter device;
the third determining module is connected with the second determining module and used for obtaining a thermal resistance change slope according to the transient state change trend of the first thermal resistance and quickly determining a steady-state value of the thermal resistance of the radiator according to the first sample data; the first sample data is sample data of the corresponding relation between the thermal resistance change slope and the thermal resistance steady-state value in a specific time period;
the fourth determining module is connected with the third determining module and used for rapidly determining the heat dissipation state of the radiator at the moment by combining second sample data according to the thermal resistance steady-state value obtained by the third determining module; the second sample data is sample data of a corresponding relation between a steady-state value of thermal resistance and a heat dissipation state of the heat sink.
The device for rapidly detecting the heat dissipation state of the radiator of the converter device provided by the invention can execute the technical scheme shown in the embodiment of the method, the implementation principle and the beneficial effect are similar, and the detailed description is omitted here.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the embodiments of the present invention, and are not limited thereto; although embodiments of the present invention have been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the embodiments of the present invention.
Those not described in detail in this specification are within the skill of the art.
Claims (5)
1. A method for rapidly detecting the heat dissipation state of a radiator is characterized by comprising the following steps:
step 1, acquiring the temperature of the radiator and the temperature of an air inlet of the radiator; the temperature of the radiator is a first temperature, and the temperature of an air inlet of the radiator is a second temperature;
calculating the power loss of the power device according to the ratio of the power loss of the power device to the input active power of the converter device;
step 2, determining a first thermal resistance according to the first temperature, the second temperature and the power loss of the power device;
step 3, obtaining a thermal resistance change slope according to the transient state change trend of the first thermal resistance, searching a corresponding relation between the thermal resistance change slope and a thermal resistance steady-state value, and quickly judging the thermal resistance steady-state value;
step 4, searching the corresponding relation between the thermal resistance steady state value and the heat dissipation state of the heat sink according to the thermal resistance steady state value, and quickly judging the heat dissipation state of the heat sink;
in step 3, obtaining a thermal resistance change slope according to the transient state change trend of the first thermal resistance, wherein the calculation formula of the thermal resistance change slope is as follows:
wherein, t1、t2Are respectively two adjacent moments in the first thermal resistance change process, R11Is t1Thermal resistance value, R, corresponding to time21Is t2The thermal resistance value corresponding to the moment, k is the thermal resistance change slope;
the corresponding relation between the thermal resistance change slope and the thermal resistance steady-state value and the corresponding relation between the thermal resistance steady-state value and the heat dissipation state of the radiator are obtained through experimental data.
2. The utility model provides a quick detection device of radiator radiating state which characterized in that includes: the device comprises an acquisition module, a first determination module, a second determination module, a third determination module and a fourth determination module;
the acquisition module comprises a temperature sensor, a current sensor and a voltage sensor and is used for acquiring the temperature of the radiator, the temperature of an air inlet of the radiator and the direct current I of the direct current side of the converterdcDC side voltage U of converterdcEffective value I of A-phase current at AC side of converteraAC side A phase voltage effective value U of convertera(ii) a The temperature of the radiator is a first temperature, and the temperature of an air inlet of the radiator is a second temperature;
the first determining module is connected with the obtaining module and is used for obtaining the direct-current side current I of the converter device through the obtaining moduledcDC side voltage U of converterdcEffective value I of A-phase current at AC side of converteraAC side A phase voltage effective value U of converteraCalculating the input active power of the converter device; then calculating the power loss of the power device according to the ratio of the power loss of the power device to the input active power of the converter device;
the second determining module is connected with the obtaining module and the first determining module and is used for determining a first thermal resistance according to the first temperature, the second temperature and the power loss of the power device of the converter device;
the third determining module is connected with the second determining module and used for obtaining a thermal resistance change slope according to the transient state change trend of the first thermal resistance and quickly determining a steady-state value of the thermal resistance of the radiator according to the first sample data; the first sample data is sample data of the corresponding relation between the thermal resistance change slope and the thermal resistance steady-state value in a specific time period;
the fourth determining module is connected with the third determining module and used for rapidly determining the heat dissipation state of the radiator according to the thermal resistance steady-state value obtained by the third determining module and by combining second sample data; the second sample data is sample data of a corresponding relation between a steady-state value of thermal resistance and a heat dissipation state of the heat sink.
3. The device for rapidly detecting the heat dissipation state of the heat sink as claimed in claim 2, wherein the first determining module has a corresponding storage function and a corresponding calculating function for storing a power loss calculating program of the power device.
4. The apparatus according to claim 2, wherein the third determining module is further configured to store a corresponding relationship between a thermal resistance change slope and a thermal resistance steady-state value.
5. The apparatus according to claim 2, wherein the fourth determining module is further configured to store a corresponding relationship between the steady-state value of the thermal resistance and the heat dissipation status of the heat sink.
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| TWI391642B (en) * | 2009-11-25 | 2013-04-01 | Inventec Corp | Performance evaluation method for heat dissipation module |
| CN104950009B (en) * | 2014-03-28 | 2018-11-20 | 杭州远方光电信息股份有限公司 | A kind of thermal resistance analysis method |
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