CN111442852A - Device and method for detecting surface temperature of heating element in cylindrical cavity - Google Patents
Device and method for detecting surface temperature of heating element in cylindrical cavity Download PDFInfo
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- CN111442852A CN111442852A CN202010330940.2A CN202010330940A CN111442852A CN 111442852 A CN111442852 A CN 111442852A CN 202010330940 A CN202010330940 A CN 202010330940A CN 111442852 A CN111442852 A CN 111442852A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 93
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 32
- 238000009529 body temperature measurement Methods 0.000 claims abstract description 26
- 238000003062 neural network model Methods 0.000 claims description 15
- 230000003213 activating effect Effects 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000010801 machine learning Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 6
- 241000208125 Nicotiana Species 0.000 description 3
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 3
- 238000013528 artificial neural network Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 239000003571 electronic cigarette Substances 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 238000012549 training Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000012271 agricultural production Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000002076 thermal analysis method Methods 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06N—COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS
- G06N3/00—Computing arrangements based on biological models
- G06N3/02—Neural networks
- G06N3/04—Architecture, e.g. interconnection topology
- G06N3/044—Recurrent networks, e.g. Hopfield networks
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06N—COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS
- G06N3/00—Computing arrangements based on biological models
- G06N3/02—Neural networks
- G06N3/04—Architecture, e.g. interconnection topology
- G06N3/045—Combinations of networks
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06N—COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS
- G06N3/00—Computing arrangements based on biological models
- G06N3/02—Neural networks
- G06N3/08—Learning methods
- G06N3/084—Backpropagation, e.g. using gradient descent
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention discloses a detection device and a method suitable for the surface temperature of a heating element in a cylindrical cavity, wherein the device comprises the following components: one or more thermocouples for measuring the surface temperature of the heated object under load; one or more non-contact temperature measuring sensors for measuring the surface temperature of the heating member during heating when the heating member is idle; and the one or more processors are used for measuring and calculating the surface temperature of the heating element according to the detection values of the thermocouple and the non-contact temperature measurement sensor. The invention adopts different detection means under different working conditions, adopts a measurement mode of combining an infrared temperature measurement sensor, a thermocouple and a machine learning technology, and can realize the surface temperature detection of the heating element under no-load and load conditions.
Description
Technical Field
The invention relates to a device and a method for detecting the surface temperature of a heating element in a cylindrical cavity, and belongs to the technical field of heating element temperature detection.
Background
The temperature is the most common and important index in the field of industrial production and living, and influences the use limit of various devices. Almost all physicochemical reaction processes in nature are closely related to temperature, so that temperature is an important physical quantity that needs to be generally measured and controlled in industrial and agricultural production, scientific experiments and daily life. The temperature can be only indirectly measured by a certain characteristic of the object changing along with the temperature, the temperature measurement is mainly divided into a contact type and a non-contact type, and a temperature measurement method for keeping the same temperature between the sensor and the object by placing the sensor in the same thermal equilibrium state as the object is contact temperature measurement; non-contact temperature measurement is measured by the thermal radiation principle.
In some small heating devices, the surface temperature of a small-area heating element (such as a heating element of an electronic cigarette) is a physical quantity which needs to be measured and controlled by the device, a heated object needs to be fixed in the heating process, the heated object is generally placed in a cavity, the heating element is positioned at the bottom of the cavity or embedded in a base material and inserted into the heated object, and under the condition that the heating element is heated in a no-load manner, because the cavity space is narrow, the surface temperature of the heating element is detected by a thermocouple, the thermocouple needs to be placed on the heating element, and the action is complex; when the heating member is heated by a load, contact or non-contact temperature detection of the heating member is not possible due to the presence of the heated object.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a device and a method for detecting the surface temperature of a heating element in a cylindrical cavity, which can simultaneously realize the surface temperature detection of the heating element under the conditions of load and no load.
In order to achieve the purpose, the invention provides the following technical scheme:
in one aspect, an embodiment of the present invention provides a device for detecting a surface temperature of a heat generating member in a cylindrical cavity, including:
one or more thermocouples for measuring the surface temperature of the heated object under load;
one or more non-contact temperature measuring sensors for measuring the surface temperature of the heating member during heating when the heating member is idle;
and the one or more processors are used for measuring and calculating the surface temperature of the heating element according to the detection values of the thermocouple and the non-contact temperature measurement sensor.
In the scheme, under the no-load condition, the surface temperature of the heating part can be directly detected by using a non-contact temperature measuring sensor and a thermal radiation principle; under the load condition, the surface temperature of the heated object is measured by the thermocouple to indirectly obtain the surface temperature of the heating element. The scheme can not only avoid the implementation difficulty of thermocouple detection in no-load, but also solve the problem that the surface temperature of the heating part cannot be measured in load.
In a further preferred embodiment, the detecting device further comprises a display connected to the processor for displaying the detected surface temperature of the heat generating member. Through setting up the display, can audio-visual demonstration testing result, be convenient for look over.
In a further optimized scheme, when the number of the thermocouples and/or the non-contact temperature measuring sensors is multiple, the thermocouples and/or the non-contact temperature measuring sensors are respectively installed at different positions in the cylindrical cavity. The accuracy of the detection result can be improved by arranging a plurality of thermocouples and/or non-contact temperature measuring sensors which are respectively distributed at different positions.
On the other hand, the embodiment of the invention provides a method for detecting the surface temperature of a heating element in a cylindrical cavity by using the detection device, which comprises the following steps:
when the heating element is in an idle state, starting a non-contact temperature measuring sensor to acquire the surface temperature of the heating element during heating, wherein the acquired temperature is the detected surface temperature of the heating element;
when the heating element is in a load state, starting the thermocouple to collect the surface temperature of the heated object, and calculating the surface temperature of the heating element according to the surface temperature of the heated object.
In one embodiment, the step of calculating the surface temperature of the heat generating member based on the surface temperature of the heated object includes: and inputting the collected surface temperature of the heated object into a pre-trained BP neural network model, and outputting to obtain the surface temperature of the heating element. The BP neural network has strong learning ability, and has more accurate prediction ability through learning sample data.
The invention has the beneficial effects that:
1. under the condition that the heating element is heated in a no-load mode, the surface temperature of the heating element is measured by an infrared temperature measuring sensor through a heat radiation principle, and the action complexity of the thermocouple is reduced.
2. The surface temperature of the heated object under the load condition is detected by using the thermocouple, a soft measurement model of the surface temperature of the heated object and the surface temperature of the heating element is established by using the surface temperature of the heated object measured by the thermocouple according to the approximate positive correlation between the surface temperature of the heated object and the surface temperature of the heating element, the temperature detection of the heating element under the load condition is realized by using the soft measurement model, and the problem that the surface temperature of the heating element cannot be measured is solved.
Drawings
Fig. 1a-c are top, left and front cross-sectional views, respectively, of an application scenario of a detection device.
FIG. 2 is a flow chart of temperature measurement of the detection device under different conditions.
FIG. 3 is a BP neural network topology.
The labels in the figure are:
11-wrapping leatheroid; 12-a thermocouple; 13-a heating plate; 14-a cylindrical cavity; 15-infrared temperature measuring sensor.
Detailed Description
Example 1
This embodiment provides a detection apparatus suitable for a piece surface temperature that generates heat in cylindricality cavity, includes:
one or more thermocouples for measuring the surface temperature of the heated object under load;
one or more non-contact temperature measuring sensors for measuring the surface temperature of the heating member during heating when the heating member is idle;
and the one or more processors are used for measuring and calculating the surface temperature of the heating element according to the temperature data detected by the thermocouple and the non-contact temperature measuring sensor.
In the device, the non-contact temperature measuring sensor preferably adopts an infrared temperature measuring sensor, and the detection precision is high.
The device also comprises a display which is connected with the processor and is used for displaying the detected surface temperature of the heating element so as to be convenient for visual inspection.
More specifically, the detecting device of the present invention will be described in more detail with reference to the accompanying drawings and a specific exemplary product.
Referring to fig. 1a-c, by way of example, the product is an electronic cigarette, the heated object is tobacco leaves (cut tobacco), the fixing member for fixing the heated object is a wrapping paper 11, a cylindrical cavity 14 is formed inside the wrapping paper 11 for accommodating the tobacco leaves, the heating member is a heating sheet 13, and the heating sheet 13 is composed of a heating wire (heating material) and a base material.
In the structure shown in fig. 1, 2 infrared temperature sensors 15 are respectively arranged at different positions along the length direction of the cylindrical cavity 14, and the infrared temperature sensors 15 are fixed on the inner surface of the wrapping paper 11. Theoretically, it is enough that the infrared temperature measurement sensor 15 is one, and the purpose of adopting 2 infrared temperature measurement sensors 15 in this embodiment is to avoid that temperature detection cannot be performed when the infrared sensor fails, so that more infrared temperature measurement sensors can be adopted without considering the cost. The 2 infrared temperature measuring sensors respectively and simultaneously acquire the surface temperature of the heating part, if the two detection values have no difference or have small difference (smaller than a set threshold value), the two infrared temperature measuring sensors are indicated to work normally (the probability that the two infrared temperature measuring sensors are damaged simultaneously is low, and the probability is ignored here), so that the average value of the two infrared temperature measuring sensors can be taken as the surface temperature of the heating part; if the two detection values are greatly different (larger than the set threshold value), the fact that one infrared temperature measurement sensor possibly fails is indicated, and therefore the detection value of the other infrared temperature measurement sensor is selected as the surface temperature of the heating element. If the infrared temperature measurement sensor fails, the detection result is obviously abnormal, so that the condition that which fault occurs and which does not occur cannot be distinguished does not exist.
In the structure shown in fig. 1, there are 4 thermocouples 12 respectively disposed at different positions along the circumferential direction of the cylindrical cavity 14, and the thermocouples 12 are fixed on the inner surface of the wrapping paper 11. Theoretically, one thermocouple may be used, but in this embodiment, the surface temperature of the heating element is predicted based on the BP neural network model, the input of the BP neural network model is the detection value of the thermocouple, and since the BP neural network model in this embodiment is a three-layer network topology structure of 4 × 5 × 1, as shown in fig. 3, 4 thermocouples need to be used. It is easy to understand that the topological structures of the BP neural network models are different, and the number of thermocouples is different, that is, the number of thermocouples is determined by N of the three-layer network topological structure of the BP neural network model N (N +1) × 1, wherein N is an integer greater than or equal to 1. And inputting the acquired detection value of the thermocouple into a pre-trained BP neural network model, and outputting to obtain the surface temperature value of the heating element.
As shown in fig. 1c, one of the thermocouples is installed between the two infrared temperature sensors, but it is understood that this is merely an example of a layout manner, and the installation position between the infrared temperature sensors and the thermocouples is not particularly required.
Example 2
Referring to fig. 2-3, the present embodiment provides a method for detecting a surface temperature of a heat generating member in a cylindrical cavity, and the adopted detection apparatus is as described in embodiment 1.
The method comprises the steps of firstly analyzing the working condition and the structural characteristics of a heating element according to the distribution condition of the heating material on a substrate material, establishing a geometric model, giving material attributes to model components, inputting the total heat generation quantity of the heating element within one minute as a thermal boundary condition into model parameters, establishing a COMSO L simulation model, analyzing temperature field distribution, then performing steady-state temperature field analysis on the model on the basis of the established model, determining the upper limit and the lower limit of the temperature distribution of the heating element according to the thermal analysis result of the heating element and combining with the temperature control requirement, thereby obtaining the approximate temperature range of temperature measurement, and selecting the infrared temperature measurement sensor and the thermocouple which have proper ranges and meet the use precision by taking the maximum value and the minimum value of the surface temperature of the heating element as the temperature ranges of the infrared temperature measurement sensor and the thermocouple, wherein the temperature ranges of the infrared temperature measurement sensor and the thermocouple are preferably 0-300 ℃, the acceptable working temperature is-20-300 ℃ and the temperature resolution is 0.1 ℃, and the volumes of the infrared temperature measurement sensor and the thermocouple are as small as possible, so as to reduce.
The detection device described in example 1 is already installed in the cavity when the electronic cigarette is produced. During actual detection, if the heating element is in an idle state at present, starting the infrared temperature measurement sensor to acquire the surface temperature of the heating element during heating, wherein the acquired temperature is the detected surface temperature of the heating element; and if the heating element is in a load state at present, starting the thermocouple to collect the surface temperature of the heated object, and calculating according to the surface temperature of the heated object to obtain the surface temperature of the heating element.
As described in embodiment 1, if only one infrared temperature measurement sensor (or only one infrared temperature measurement sensor works normally), the detection value of the infrared temperature measurement sensor is directly used as the surface temperature of the heating element when the heating element is unloaded; if the infrared temperature measurement sensors have two or more (normally work), the average value of the infrared temperature measurement sensors is used as the surface temperature of the heating element when the heating element is unloaded.
As described in embodiment 1, the detected value (i.e., the surface temperature of the heated object) acquired by the thermocouple is input into the BP neural network model trained in advance, and the surface temperature of the heat generating member can be output.
The training process of the BP neural network model comprises the steps of preprocessing the surface temperature of a heated object acquired by a thermocouple under experimental conditions and the surface temperature of a heating element under load conditions, removing abnormal data points and constructing a sample data set, taking 2/3 sample data as a training set for learning and modeling, and taking 1/3 residual sample data as a test set of the model. Under the condition that a heating element is heated in a load mode, the surface temperature of a heated object is detected in a thermocouple contact mode, the surface temperatures of the heated object in different directions are used as input variables of a BP neural network model, the surface temperature of the heating element in the experimental process is used as output variables of the BP neural network model, a heating element surface temperature prediction model based on the BP neural network is established, and a three-layer network topological structure of 4 x 5 x 1 is selected, as shown in figure 3. The innovation of the invention is that the BP neural network model is applied to the temperature detection of the heating element in the cylindrical cavity, and the training process of the BP neural network model is the prior art and is not elaborated too much here.
While the present invention has been described in detail with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (8)
1. The utility model provides a detection apparatus suitable for a piece surface temperature that generates heat in cylindricality cavity which characterized in that includes:
one or more thermocouples for measuring the surface temperature of the heated object under load;
one or more non-contact temperature measuring sensors for measuring the surface temperature of the heating member during heating when the heating member is idle;
and the one or more processors are used for measuring and calculating the surface temperature of the heating element according to the detection values of the thermocouple and the non-contact temperature measurement sensor.
2. The detecting device for detecting the surface temperature of a heat generating member according to claim 1, further comprising a display connected with the processor for displaying the detected surface temperature of the heat generating member.
3. The detecting device according to claim 1, wherein the non-contact temperature measuring sensor is an infrared temperature measuring sensor.
4. The detecting device for detecting the rotation of a motor rotor according to the claim 1, wherein when the number of the thermocouples and/or the non-contact temperature measuring sensors is plural, the plural thermocouples and/or the non-contact temperature measuring sensors are respectively installed at different positions in the cylindrical cavity.
5. The method for detecting the surface temperature of the heating element in the cylindrical cavity by using the detection device as claimed in any one of claims 1 to 4, is characterized by comprising the following steps:
when the heating element is in an idle state, starting a non-contact temperature measuring sensor to acquire the surface temperature of the heating element during heating, wherein the acquired temperature is the detected surface temperature of the heating element;
when the heating element is in a load state, starting the thermocouple to collect the surface temperature of the heated object, and calculating the surface temperature of the heating element according to the surface temperature of the heated object.
6. The method according to claim 5, wherein the step of calculating the surface temperature of the heat generating member based on the surface temperature of the heated object includes: and inputting the collected surface temperature of the heated object into a pre-trained BP neural network model, and outputting to obtain the surface temperature of the heating element.
7. The method of claim 6, wherein the BP neural network model is a three-tier network topology of N (N +1) 1, N being an integer greater than or equal to 1.
8. The method according to claim 5, wherein in the step of activating the non-contact temperature measuring sensors to collect the surface temperature of the heat generating member during heating, the collected temperature being the detected surface temperature of the heat generating member, if the plurality of non-contact temperature measuring sensors are provided and the difference between the detection values of the plurality of non-contact temperature measuring sensors is within a set threshold range, the average value of the plurality of non-contact temperature measuring sensors is taken as the detected surface temperature of the heat generating member.
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| CN202010330940.2A CN111442852B (en) | 2020-04-24 | 2020-04-24 | Device and method for detecting surface temperature of heating element in cylindrical cavity |
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| CN202010330940.2A CN111442852B (en) | 2020-04-24 | 2020-04-24 | Device and method for detecting surface temperature of heating element in cylindrical cavity |
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Cited By (2)
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| CN112504507A (en) * | 2020-11-20 | 2021-03-16 | 安徽华米信息科技有限公司 | Wearable device |
| CN113049112A (en) * | 2021-03-22 | 2021-06-29 | 张峰亮 | Bearing roller axle bush temperature measuring device |
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| CN111442852B (en) | 2023-06-13 |
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