CN111220644A - Quilt warm-keeping performance testing method and testing device adopted by same - Google Patents
Quilt warm-keeping performance testing method and testing device adopted by same Download PDFInfo
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- CN111220644A CN111220644A CN201811418407.0A CN201811418407A CN111220644A CN 111220644 A CN111220644 A CN 111220644A CN 201811418407 A CN201811418407 A CN 201811418407A CN 111220644 A CN111220644 A CN 111220644A
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- 238000012360 testing method Methods 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 claims abstract description 8
- 230000014759 maintenance of location Effects 0.000 claims description 15
- 238000013500 data storage Methods 0.000 claims description 8
- 238000010998 test method Methods 0.000 claims description 7
- 238000012937 correction Methods 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 5
- 238000009413 insulation Methods 0.000 claims description 4
- 238000009826 distribution Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 238000011056 performance test Methods 0.000 claims description 2
- 230000006641 stabilisation Effects 0.000 claims 1
- 238000011105 stabilization Methods 0.000 claims 1
- 238000010792 warming Methods 0.000 abstract description 8
- 238000004364 calculation method Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000004744 fabric Substances 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- 239000000835 fiber Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 235000008708 Morus alba Nutrition 0.000 description 1
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- 238000004378 air conditioning Methods 0.000 description 1
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- 239000004566 building material Substances 0.000 description 1
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- 238000012423 maintenance Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000012925 reference material Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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- 238000012795 verification Methods 0.000 description 1
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- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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Abstract
The invention provides a method for testing the warm-keeping performance of a quilt, which comprises the following steps: 1) in the environment with fixed temperature difference, a quilt sample is placed on a hot plate with a one-dimensional temperature stable field, and the heat of the hot plate can be transferred outwards only through the quilt sample; 2) measuring the input power of the hot plate in unit time, and calculating the thermal resistance of the quilt sample under the specified conditions, wherein the thermal resistance value is 10 times that of the quilt sample, namely the heat retention coefficient Rf. The method and the device for testing the warming performance of the quilt in a standardized manner can directly test the warming values of different types of quilts and can ensure the accuracy of data. Meanwhile, the invention has higher precision, so that the small difference of the warming values similar to a quilt in the test is accurately tested, and the objective judgment is made on the warming performance of the quilt.
Description
Technical Field
The invention relates to the technical field of a method and equipment for testing the warm-keeping performance of a quilt.
Background
Good quilts must be warm, dry, soft, and breathable. The winter quilt has various types, namely a full wool quilt with mellow turns, a light and warm down quilt, a mulberry silk quilt which is soft and comfortable to skin, and a chemical fiber quilt which is soft in texture, stiff in suspension, smooth and comfortable? The choice of the winter quilt is determined according to specific conditions, some people pay attention to lightness and some people pay more attention to the material of the quilt. Regardless of the needs, the warmth retention requirements of winter quilts are certainly the first. Therefore, how to detect the quilt warmth retention property through the instrument is very meaningful.
By taking the flocculent quilt as an example, people pay attention to different seasons in life, choose which quilt is more comfortable, and whether the quilt has powerful data support or not, so that consumers can more easily distinguish the warmth retention property of the product, and further select the commodity suitable for the consumers, and the quilt becomes a new subject to be solved. The heat retention property is expressed by the thermal resistance value, which is one of the important indexes for measuring the heat insulation performance of materials and products. For normal fabrics, the heat flow is the dominant component of the vertical transport when there is a temperature difference between the upper and lower surfaces, due to the thin thickness and the apparent vertical porosity between the upper and lower surfaces or between the yarns. For the high-fluffy flocculent fiber aggregate material, because a large number of fine gaps and holes with complex shapes exist, the fluffy degree is high, the thickness is thick, and the heat transmission is generally two-dimensional or three-dimensional. Therefore, the existing instruments and test methods for testing common fabrics at home and abroad are not suitable for testing the thermal resistance values of the flocculent materials and the products thereof.
At present, no supplier or manufacturer can provide the test equipment for the warm-keeping performance of the quilt in the market, so that a reasonable and standardized test method and equipment for the warm-keeping performance of the quilt are urgently needed to meet the market demand.
Disclosure of Invention
The invention aims to solve the blank in the prior art and provides a method and a test instrument for testing the warm-keeping performance of a quilt in a standardized manner.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a quilt heat retention performance test method comprises the following steps:
1) in the environment with fixed temperature difference, a quilt sample is placed on a hot plate with a one-dimensional temperature stable field, and the heat of the hot plate can be transferred outwards only through the quilt sample;
2) measuring the input power of the hot plate in unit time, calculating the thermal resistance of the quilt sample under the specified conditions, wherein the thermal resistance value is 10 times that of the quilt sample, namely the thermal coefficient Rf：
Recording the actual energization time T of the hot plate1Voltage V of hot plate, current I of hot plate, effective test area A of hot plate, temperature t of air layer above quilt sampleoTemperature t of surface of hot plate below quilt sample1And a test time T2The warm keeping coefficient R of the quilt is calculated according to the following formulaf：
(1)WT＝T1/T2x V x I
(2)WA＝WT-C
(3)
(4)Rf＝Rct-Ra
Wherein C is the hot plate correction value, RaThe heat retention value of the air layer (empty plate).
The one-dimensional temperature stable field means that heat can only be transferred upwards, and a hot plate with heat only being transferred upwards can ensure that the temperature of the upper surface of a hot plate test area is uniform and is stably and accurately controlled within a certain range. Specifically, temperature protection zones can be arranged in front of, behind, on the left side, on the right side of and below the test zone, the temperature of the protection zones is consistent with that of the corresponding parts of the test zone, almost no temperature difference exists, and the possibility of heat transfer does not exist, so that the heat of the test zone can be only transferred from the right top of the hot plate test zone to the outside. Furthermore, the minimum dimension of the central measuring area is a rectangle of 1.0 m × 0.6m, and the effective protection area width of the protection area around the central measuring area is 0.15 m.
The environment with fixed temperature difference refers to the environment with relative humidity of 65 +/-5% and temperature controlled at 20 +/-2 ℃. All visible surfaces on the upper surface of the quilt sample have a high heat reflection capacity, and most building materials and building finishing materials now also have a high heat reflection capacity, so that it is also desirable to shield any external heat sources, such as radiators, lamps, solar radiation, technicians, fans, etc., from any positioning of air conditioning equipment. Further, the measurement accuracy of the temperature of the upper hot runner face and the air layer directly above the quilt sample was measured to 0.1 ℃.
The upper surface of the hot plate is flat and isothermal, and a black matte metal plate is preferred; the hot plate is horizontally arranged, heat flows upwards, and measurement is carried out between the upper hot surface of the hot plate and an air layer right above a quilt sample.
The specified conditions in the step 2) refer to the standardized technical requirements for the detection, such as industries, organizations, enterprises and the like. For example, the temperature is set to 33.0 + -0.5 deg.C, the temperature of the air immediately above the quilt is set to 20.0 + -0.5 deg.C, and the flow rate of the air immediately above the quilt is set to not more than 0.3 m/s.
The hot plate correction value C is an output power value measured by a simulation test hot plate under the condition of not dissipating heat. Verification is necessary within a time interval of no more than 12 months after commissioning. In addition, repair, maintenance of the device, which may affect accuracy, or the result may not be consistent with the reference material thermal resistance value (i.e., the difference is not within 5%), the device should be further verified for use.
The utility model provides a quilt thermal insulation performance testing arrangement, includes test platform, heater, hot plate, first temperature sensor group, second temperature sensor group, hot backplate, data storage and display, the hot plate be fixed in on the test platform, hot backplate locate the bottom surface and four sides of hot plate, the even distribution of heater is in test platform upper plane and bottom plate, first temperature sensor group locate apart from the hot plate height directly over 75-100mm, second temperature sensor group locate the hot plate upper surface, first temperature sensor group and second temperature sensor group and data storage and display signal connection.
Further, the first temperature sensor group is in a vertical up-and-down moving mode, so that the first temperature sensor group can be positioned between 75 mm and 100mm right above the quilt sample. Furthermore, the first temperature sensor group is provided with 5 temperature sensors which are fixed on the same horizontal line 90mm away from the right upper part of the hot plate through a bracket.
Furthermore, the second temperature sensor group is provided with a plurality of temperature sensors which are uniformly distributed on the upper surface of the hot plate.
The heat guard plate forms a temperature protection area, which can ensure that the temperature of the upper surface of the test area is uniform, stable and accurate to be controlled in a certain range. The thickness of the heat protection plate is not less than 150mm, namely a temperature protection area not less than 150mm is formed.
The hot plate is a flat metal plate with enough thickness, and can ensure that a test sample is flat and the surface temperature of the hot plate is uniform.
Further, the area of the hot plate test area surrounded by the hot guard plate is 0.6m × 1 m.
Furthermore, the periphery of the heat protection plate is also provided with a heat preservation layer, so that the temperature of a test area is further stabilized.
The first temperature sensor group and the second temperature sensor group transmit the temperature data to the data storage and display through wired or wireless signals, and the data storage and display stores and displays the temperature signals. Furthermore, the temperature data can be programmed to be processed, edited and calculated, and then the calculation result can be directly displayed.
The invention has the advantages of
The method and the device for testing the warming performance of the quilt in a standardized manner can directly test the warming values of different types of quilts and can ensure the accuracy of data.
Meanwhile, the invention has higher precision, so that the small difference of the warming values similar to a quilt in the test is accurately tested, and the objective judgment is made on the warming performance of the quilt.
The invention fills the gap of the market for evaluating the heat preservation performance of the large quilt, meets and enriches the test requirements of various manufacturers, suppliers and buyers at home and abroad, enables the manufacturers to more reasonably know the relevant quality and technical index of the product, adjusts the production process in time, and finishes the production on time with quality guarantee. Plays an important role in improving the quality of products.
Drawings
Fig. 1 is a schematic diagram of a method for testing the warm-keeping performance of a quilt by using the testing device of the invention.
FIG. 2 is a schematic plan view of the testing apparatus of the present invention.
Description of reference numerals:
1 first temperature sensor group
2 Hot plate
3 quilt sample
Detailed Description
As shown in fig. 1 and 2, the quilt heat retention performance testing device provided by the invention comprises a testing platform, a heater, a hot plate, a first temperature sensor group, a second temperature sensor group, a heat protection plate and a data storage and display, wherein the hot plate is fixed on the testing platform, the heat protection plate is arranged on the bottom surface and four side surfaces of the hot plate, the heater is uniformly distributed on the upper plane and the bottom plate of the testing platform, the first temperature sensor group is arranged right above the hot plate at a height of 75-100mm, the second temperature sensor group is arranged on the upper surface of the hot plate, and the first temperature sensor group and the second temperature sensor group are in signal connection with the data storage and display.
The first temperature sensor set is in a vertical up-and-down movement mode so that it can be positioned between 75 mm and 100mm directly above the quilt sample. Furthermore, the first temperature sensor group is provided with 5 temperature sensors which are fixed on the same horizontal line 90mm away from the right upper part of the hot plate through a bracket.
The second temperature sensor group is provided with a plurality of temperature sensors which are uniformly distributed on the upper surface of the hot plate.
The heat guard plate forms a temperature protection area, which can ensure that the temperature of the upper surface of the test area is uniform, stable and accurate to be controlled in a certain range. The thickness of the heat protection plate is not less than 150mm, namely a temperature protection area not less than 150mm is formed. The heat protection plate is an existing constant-temperature heating device. The maximum power of the heater is 400W, and the maximum power of the heater in the lower protection zone is 300W.
The hot plate is a flat metal plate with enough thickness, and can ensure that a test sample is flat and the surface temperature of the hot plate is uniform.
And the periphery of the heat protection plate is also provided with a heat preservation layer, so that the temperature of a test area is further stabilized.
The quilt warmth retention property testing device comprises the following specific technical parameters of parts, all instruments and testing requirements:
(1) hot plate: a flat, isothermal, matte black metal plate 1390mm × 993 mm;
(2) the test bench is 1470mm multiplied by 1070mm multiplied by 825 mm;
(3) an air layer temperature sensor frame 560mm multiplied by 300mm multiplied by 90 mm;
(4) the setting range of preheating, stabilizing and measuring time is 0 to 86400s (24h)
(5) The area of the test area is 1000m multiplied by 600 mm;
(6) the shelf adopted by the first temperature sensor group in the air layer is 560mm multiplied by 300mm multiplied by 90 mm;
(7) power supply: AC 220V and 50Hz, rated heater voltage of 32.5V and current coefficient of 7A
(8) Constant temperature heating device: the maximum power of the heater is 400W, and the maximum power of the heater in the lower protection zone is 300W.
When the test is carried out, the test paper is put into practical use,
(1) the set test conditions are as follows:
a) the temperature of the test plate is (33.0 +/-0.5) DEG C;
b) controlling the atmospheric temperature to be (20.0 +/-0.5) DEG C;
c) the air flow speed is controlled to be not more than 0.3 m/s.
The accuracy of the temperature of the hot plate and the air layer temperature sensor is +/-0.1 ℃.
(2) The empty panels were tested for warmth retention value, i.e., the test samples were not covered on the test hotplate. The test time was 3600 seconds. Recording the actual energization time toAnd temperature t of air layer above hot plate1. Calculating R by formulact0。
(1)WT＝T1/T2x V x I
(2)WA＝WT-C
(3)
(4)Rf＝Rct-Ra
Wherein
WTTotal common rate (unit: W);
WAactual consumption (unit: W);
T1is electrifiedTime (unit: S);
T2test time, 3600 s;
v voltage, constant is 32.5V;
i current, constant is 7A;
c the measured value of the device is 3.04W;
effective test area (unit: m) of A heating plate2),0.6m2；
toThe temperature (unit: DEG C) of an air layer above the quilt;
t1the surface temperature (unit: DEG C) of the upper heating plate;
Rcttotal warmth retention value (units: tog);
Rfthe warmth retention value of the quilt (unit: tog);
Rathe insulation value (unit: tog) of the air layer (blank sheet).
(3) The comforter was laid flat on the hot plate of the tester without disturbing the fill and placed in the central test area. Raise either side and pat loose half of the quilt, then gently shake this half three times, if the quilt has a channel to shake through the channel. Note that: allowing the batt to hit its maximum thickness without disturbing the uniformity of the distribution of the batt.
(4) If necessary, lightly shaking, and resetting the quilt to cover the central test area with the nearest distance of not less than 30cm from the edge of the quilt.
(5) Starting the instrument and testing. After the 3600 second test time is over, the actual power-on time t is recorded and recorded in the same wayoAnd temperature t of air layer above hot plate1. Calculating R by formulact0. And measuring 2 test values, wherein the time interval of each test value is not less than 30 minutes.
(6) Calculation formula of thermal resistance
①
practical output power WA(W) total output power WT-a correction value C
③
④Rf(tog)＝Rct(tog)-Ra(tog)
Example 1: take a piece of down quilt with 100% of filling, 100% of all cotton as outer wrapping cloth, 235mm x 227mm and 2453g weight as an example.
1. The thermal resistance of the blank was first tested, i.e., no test sample was placed on the test stand. Calculated according to (6) calculation formula of thermal resistance) the data were obtained as follows:
2. the comforter was laid flat on the hot plate of the tester without disturbing the fill and placed in the central test area for testing. The data obtained by calculation according to the calculation formula of (6) thermal resistance are as follows:
remarking:
(1) ra (warm keeping value of current air layer) 0.09tog
(2) Correction value C3.04W
(3) Area of heating plate is 0.6m2
The correction value C is calculated as follows:
Claims (10)
1. a quilt heat retention performance test method comprises the following steps:
1) in the environment with fixed temperature difference, a quilt sample is placed on a hot plate with a one-dimensional temperature stable field, and the heat of the hot plate can be transferred outwards only through the quilt sample;
2) measuring the input power of the hot plate per unit timeCalculating the thermal resistance of the quilt sample under the specified conditions, wherein the thermal resistance is 10 times of the thermal resistance value, namely the heat retention coefficient Rf：
Recording the actual energization time T of the hot plate1Voltage V of hot plate, current I of hot plate, effective test area A of hot plate, temperature t of air layer above quilt sampleoTemperature t of surface of hot plate below quilt sample1And a test time T2The warm keeping coefficient R of the quilt is calculated according to the following formulaf：
(1)WT＝T1/T2xVxI
(2)WA＝WT-C
(3)
(4)Rf＝Rct-Ra
Wherein C is the hot plate correction value, RaThe heat retention value of the air layer (empty plate).
2. A quilt warmth retention property test method as defined in claim 1, characterized in that: the one-dimensional temperature stabilization field is characterized in that temperature protection zones are arranged at the front, the back, the left, the right and the lower parts of the test zone, the temperatures of the protection zones and the corresponding parts of the test zone are kept consistent, and the heat of the test zone can only be transferred outwards from the right top of the hot plate test zone.
3. A quilt warmth retention property test method as defined in claim 2, characterized in that: the minimum dimension of the central measuring area is a rectangle of 1.0 m multiplied by 0.6m, and the effective protection area width of the protection area around the central measuring area is 0.15 m.
4. A quilt warmth retention property test method as defined in claim 1, characterized in that: the environment with fixed temperature difference refers to the environment with relative humidity of 65 +/-5% and temperature controlled at 20 +/-2 ℃.
5. A quilt warmth retention property test method as defined in claim 1, characterized in that: the upper surface of the hot plate is flat and isothermal, the hot plate is horizontally arranged, heat flows upwards, and measurement is carried out between the upper hot surface of the hot plate and an air layer right above a quilt sample.
6. A quilt warmth retention property test method as defined in claim 1, characterized in that: the specified conditions in the step 2) are that the temperature is set to be 33.0 +/-0.5℃, the air temperature right above the quilt is set to be 20.0 +/-0.5℃, and the air flow rate right above the quilt is not more than 0.3 m/s.
7. The utility model provides a quilt thermal insulation performance testing arrangement, includes test platform, heater, hot plate, first temperature sensor group, second temperature sensor group, hot backplate, data storage and display, the hot plate be fixed in on the test platform, hot backplate locate the bottom surface and four sides of hot plate, the even distribution of heater is in test platform upper plane and bottom plate, first temperature sensor group locate apart from the hot plate height directly over 75-100mm, second temperature sensor group locate the hot plate upper surface, first temperature sensor group and second temperature sensor group and data storage and display signal connection.
8. The quilt warmth retention property testing device as defined in claim 7, characterized in that: the first temperature sensor group is in a vertical up-and-down moving mode and is positioned between 75 mm and 100mm right above a quilt sample.
9. A quilt warmth retention property test device as defined in claim 8, characterized in that: the first temperature sensor group is provided with 5 temperature sensors, and the temperature sensors are fixed on the same horizontal line 90mm away from the position right above the hot plate through a support.
10. The quilt warmth retention property testing device as defined in claim 7, characterized in that: the hot plate is a flat metal plate with enough thickness, and can ensure that a test sample is flat and the surface temperature of the hot plate is uniform.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113740378A (en) * | 2021-09-15 | 2021-12-03 | 山东多星电器有限公司 | Method for testing heat energy conversion efficiency of electric heating tube |
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Application publication date: 20200602 |