WBGT index instrument temperature sensor calibration device and method

Abstract

The invention discloses a WBGT index instrument temperature sensor calibration device and method, the device comprises a first constant temperature device, a second constant temperature device, a standard constant temperature box and a temperature measurement system, and a calibrated WBGT index instrument comprises a black bulb temperature sensor, a wet bulb temperature sensor and a dry bulb temperature sensor. A calibrated WBGT index instrument is placed in the standard constant temperature box and used for calibrating the dry-bulb temperature sensor, the first constant temperature device is used for calibrating the black-bulb temperature sensor, and the second constant temperature device is used for calibrating the wet-bulb temperature sensor; the first constant temperature device and the second constant temperature device comprise constant temperature sleeves, liquid constant temperature grooves, liquid circulating pumps, liquid return pipes, liquid inlet pipes, liquid sampling pipes and heat preservation layers, the constant temperature sleeves comprise test cavities, liquid flowing interlayers, liquid inlet holes and liquid return holes, and the temperature value in the test cavities is approximately consistent with the temperature value of the liquid constant temperature grooves. According to the invention, stable and uniform temperature fields can be independently provided for the black-bulb temperature sensor, the wet-bulb temperature sensor and the dry-bulb temperature sensor.

Description

Technical Field

[0001] The invention belongs to the field of temperature measurement, and in particular relates to a WBGT indexer temperature sensor calibration device and method. Background Art

[0002] The WBGT (Wet Bulb Globe Temperature) index is a basic parameter that represents the heat load of the human body in contact with the environment. The WBGT index meter measures the three parameters of black bulb temperature, wet bulb temperature and dry bulb temperature through the black bulb temperature sensor, wet bulb temperature sensor and dry bulb temperature sensor respectively, and then calculates the WBGT index by the formula.

[0003] According to JJF 1407-2013 "WBGT Indexer Temperature Sensor Calibration Specification", the temperature calibration range of the wet-bulb temperature sensor is 5℃~40℃, the temperature calibration range of the black-bulb temperature sensor is 20℃~120℃, and the temperature calibration range of the dry-bulb temperature sensor is 10℃~60℃. When calibrating in the temperature range of 5℃~60℃, the WBGT indexer as a whole and the standard thermometer are placed in the effective working space of the standard constant temperature box at the same time. After the temperature stabilizes, the indications of the wet-bulb temperature sensor, the black-bulb temperature sensor and the dry-bulb temperature sensor are read through the display interface of the WBGT indexer, and then compared with the indication of the standard thermometer to obtain the indication error of each sensor of the indexer. In the temperature range of 60℃~120℃, the black-bulb temperature sensor and the standard thermometer need to be placed in the constant temperature bath at the same time. After the temperature stabilizes, the indication of the black-bulb temperature sensor is compared with the indication of the standard thermometer to obtain the indication error of the black-bulb temperature sensor.

[0004] Since the WBGT indexer cannot be used in the laboratory environment or in a normal temperature environment, the ambient temperature and humidity to be measured are the actual environmental conditions used by the WBGT indexer. As we all know, the ambient temperature has a great influence on the measurement accuracy of the instrument, especially when the ambient temperature reaches above 30°C. At this time, the influence of the ambient temperature on the measurement result cannot be ignored. Therefore, it is necessary to ensure that the calibration result of the WBGT indexer is the result obtained by calibration at the actual ambient temperature to ensure that the calibration result is accurate and reliable. When the WBGT indexer is actually used, its wet bulb temperature, black bulb temperature and dry bulb temperature are different. According to the definition, the dry-bulb temperature refers to the temperature obtained by directly measuring the ambient air with a temperature sensor, that is, the ambient temperature; the black-ball temperature refers to the temperature obtained by placing the temperature sensor in the middle of a black ball of specified size. Due to the effect of the black ball absorbing radiant heat, the black-ball temperature is much higher than the ambient temperature, especially in an environment exposed to the sun, the black-ball temperature may be close to 120°C; the wet-bulb temperature refers to the temperature sensor sensing part covered with a layer of wet-bulb gauze, which is soaked in pure water. Due to the effect of water vapor evaporation taking away heat, the wet-bulb temperature is lower than the ambient temperature. For example, in an environment with direct sunlight, when the ambient temperature is 40°C and the relative humidity is 20% to 95%, the wet-bulb temperature is about 23.2°C to 39.2°C, and the black-ball temperature may reach 45°C to 70°C depending on the intensity of sunlight radiation.

[0005] According to the calibration method of JJF 1407-2013 "WBGT Indexer Temperature Sensor Calibration Specification", when calibrating in the temperature range of 5℃~60℃, when the WBGT Indexer is placed in a thermostat for calibration, the temperature value provided by the thermostat is only the temperature calibration point required for the dry bulb temperature, that is, the ambient temperature value of the indexer when it is actually used. The standard thermostat cannot provide other calibration points of wet bulb temperature and black globe temperature corresponding to the dry bulb temperature (ambient temperature) at the same time. For example, when the temperature of the standard thermostat is adjusted to 60℃, it only means that the various sensors of the WBGT Indexer are calibrated at the 60℃ calibration point under the condition of an ambient temperature of 60℃. When the temperature of the standard thermostat is adjusted to 10℃, it only means that the various sensors of the WBGT Indexer are calibrated at the 10℃ calibration point under the condition of an ambient temperature of 10℃. For the measurement error of the wet bulb temperature sensor and black globe temperature sensor of the WBGT Indexer at the 10℃ calibration point, the results obtained by the WBGT Indexer at an ambient temperature of 60℃ and at an ambient temperature of 10℃ are completely different. Therefore, if the natural wet bulb temperature and black globe temperature are calibrated according to the air temperature of the standard thermostat, this calibration method is inconsistent with actual use, because in actual use, at a certain air temperature, the wet bulb temperature is lower than the air temperature, and the black globe temperature is higher than the air temperature. In the temperature calibration range of 60℃~120℃, the black globe temperature sensor needs to be calibrated in a thermostat. At this time, the WBGT index meter is calibrated under normal temperature conditions in the laboratory. This calibration method is completely inconsistent with the high temperature environment in actual use, and cannot guarantee the validity of the traceability value of the WBGT index meter under high temperature conditions. Summary of the invention

[0006] The purpose of the present invention is to provide a WBGT indexer temperature sensor calibration device and method in view of the problems existing in the prior art, which can independently provide stable and uniform temperature fields for the black ball temperature sensor, the wet bulb temperature sensor and the dry bulb temperature sensor, thereby meeting the need for traceability of the WBGT indexer under the actual temperature conditions.

[0007] In order to achieve the above object, one aspect of the present invention provides a WBGT index meter temperature sensor calibration device, including a first constant temperature device, a second constant temperature device, a standard constant temperature box and a temperature measurement system.

[0008] The calibrated WBGT indexer includes a black bulb temperature sensor, a wet bulb temperature sensor and a dry bulb temperature sensor. The standard thermostatic box is used to place the calibrated WBGT indexer and calibrate the dry bulb temperature sensor. The first thermostatic device is used to calibrate the black bulb temperature sensor, and the second thermostatic device is used to calibrate the wet bulb temperature sensor.

[0009] The first constant temperature device comprises a first constant temperature jacket, a first liquid constant temperature tank, a first liquid circulation pump, a first liquid reflux pipe, a first liquid inlet pipe, a first liquid sampling pipe and a first insulation layer, and the first constant temperature jacket comprises a first test cavity, a first liquid flow interlayer and a first liquid inlet hole and a first liquid reflux hole connected to the first liquid flow interlayer;

[0010] The first test cavity is used to place the black ball temperature sensor, one end of the first liquid inlet tube is connected to the first liquid inlet hole, the other end of the first liquid inlet tube is connected to the outlet of the first liquid circulation pump, the first liquid return tube is connected to the first liquid return hole, the other end of the first liquid return tube is placed in the first liquid constant temperature tank, one end of the first liquid sampling pipeline is connected to the inlet of the first liquid circulation pump, the other end of the first liquid sampling pipeline is placed in the first liquid constant temperature tank, the outer surfaces of the first constant temperature jacket, the first liquid return tube and the first liquid inlet tube are all provided with a first insulation layer, and the first liquid circulation pump is used to make the liquid medium in the first liquid constant temperature tank flow into the first liquid flow interlayer through the first liquid inlet tube and flow back to the first liquid constant temperature tank through the first liquid return tube;

[0011] The second constant temperature device includes a second constant temperature jacket, a second liquid constant temperature tank, a second liquid circulation pump, a second liquid reflux pipe, a second liquid inlet pipe, a second liquid sampling pipe and a second insulation layer, and the second constant temperature jacket includes a second test cavity, a second liquid flow interlayer and a second liquid inlet hole and a second liquid reflux hole connected to the second liquid flow interlayer;

[0012] The second test cavity is used to place the wet-bulb temperature sensor, one end of the second liquid inlet pipe is connected to the second liquid inlet hole, the other end of the second liquid inlet pipe is connected to the outlet of the second liquid circulation pump, one end of the second liquid return pipe is connected to the second liquid return hole, the other end of the second liquid return pipe is placed in the second liquid constant temperature tank, one end of the second liquid sampling pipeline is connected to the inlet of the second liquid circulation pump, the other end of the second liquid sampling pipeline is placed in the second liquid constant temperature tank, the outer surfaces of the second constant temperature jacket, the second liquid return pipe and the second liquid inlet pipe are all provided with a second insulation layer, and the second liquid circulation pump is used to make the liquid medium in the second liquid constant temperature tank flow into the second liquid flow interlayer through the second liquid inlet pipe and flow back to the second liquid constant temperature tank through the second liquid return pipe;

[0013] The temperature measurement system includes a thermometer and a first standard thermometer, a second standard thermometer and a third standard thermometer connected to the thermometer. The first standard thermometer, the second standard thermometer and the third standard thermometer are used to measure the temperature values ​​of the first liquid thermostatic bath, the second liquid thermostatic bath and the thermostatic box respectively.

[0014] Another aspect of the present invention provides a method for calibrating a temperature sensor of a WBGT index meter, using the above-mentioned device to calibrate the WBGT index meter to be calibrated, comprising:

[0015] Place the measuring ends of the calibrated WBGT index meter and the third standard thermometer in a standard constant temperature box, place the measuring end of the first standard thermometer in a first liquid constant temperature bath, place the measuring end of the second standard thermometer in a second liquid constant temperature bath, place the black ball temperature sensor in the first test cavity, and place the wet ball temperature sensor in the second test cavity;

[0016] The temperature values ​​of the standard thermostatic box, the first liquid thermostatic bath, and the second liquid thermostatic bath are respectively set as temperature calibration points, and the temperature values ​​of the first liquid thermostatic bath, the second liquid thermostatic bath, and the thermostatic box are respectively measured using a first standard thermometer, a second standard thermometer, and a third standard thermometer;

[0017] Assume that the temperature indications of the first standard thermometer, the second standard thermometer and the third standard thermometer are T 141 , T 142 and T 143 The temperature indications of the black ball temperature sensor, wet ball temperature sensor and dry ball temperature sensor are T 21 , T 22 and T 23 , calculate the error value as follows to complete the calibration of the black bulb temperature sensor, wet bulb temperature sensor and dry bulb temperature sensor at the set temperature calibration point:

[0018] ΔT 21 =T 21 -T 141

[0019] ΔT 22 =T 22 -T 142

[0020] ΔT 23 =T 23 -T 143 ,

[0021] Where, ΔT 21 is the error value of the black ball temperature sensor, ΔT 22 , is the error value of the wet bulb temperature sensor, ΔT 23 is the error value of the dry-bulb temperature sensor.

[0022] According to the WBGT index meter temperature sensor calibration device and method of the above aspects of the present invention, a stable and uniform temperature field can be independently provided for the black ball temperature sensor, the wet bulb temperature sensor and the dry bulb temperature sensor, respectively, to meet the requirement of tracing the WBGT index meter under the actual temperature conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings used in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work:

[0024] Figure 1 Schematic diagram of the working principle of the WBGT index meter temperature sensor calibration device according to an embodiment of the present invention;

[0025] Figure 2 is a schematic structural diagram of a calibrated WBGT indexer according to an embodiment of the present invention;

[0026] Figure 3 is a schematic structural diagram of a first constant temperature device for calibrating a black ball temperature sensor according to an embodiment of the present invention;

[0027] Figure 4 is a schematic structural diagram of a second constant temperature device for calibrating a wet-bulb temperature sensor according to an embodiment of the present invention;

[0028] Figure 5 is a schematic structural diagram of a temperature measurement system according to an embodiment of the present invention;

[0029] Figure 6 is a side schematic diagram of the first and second constant temperature jackets according to an embodiment of the present invention;

[0030] Figure 7 is a front schematic diagram of the first and second constant temperature sleeves according to an embodiment of the present invention;

[0031] Figure 8 is a cross-sectional schematic diagram of the first and second constant temperature sleeves according to an embodiment of the present invention;

[0032] Fig. 9 is a schematic top view of the first and second constant temperature jackets of an embodiment of the present invention;

[0033] Fig.10 1 is a bottom view schematically showing the first and second constant temperature sleeves according to an embodiment of the present invention. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] One embodiment of the present invention provides a WBGT indexer temperature sensor calibration device, such as Figure 1 As shown, the WBGT index meter temperature sensor calibration device 1 according to the embodiment of the present invention is used to calibrate the WBGT index meter 2 to be calibrated, and includes a first constant temperature device 11 , a second constant temperature device 12 , a standard constant temperature box 13 and a temperature measurement system 14 .

[0036] like Figure 2 As shown, the calibrated WBGT index meter 2 includes a black ball temperature sensor 21, a wet bulb temperature sensor 22, and a dry bulb temperature sensor 23. The calibrated WBGT index meter 2 may have a display unit for displaying the temperature indications of the black ball temperature sensor 21, the wet bulb temperature sensor 22, and the dry bulb temperature sensor 23. The first constant temperature device 11 is used to calibrate the black ball temperature sensor 21, and the second constant temperature device 12 is used to calibrate the wet bulb temperature sensor 22. The structures of the first constant temperature device 11 and the second constant temperature device 12 may be the same. Figure 3 As shown, the first thermostatic device 11 of the embodiment of the present invention includes a first thermostatic jacket 111, a first liquid thermostatic tank 112, a first liquid circulation pump 113, a first liquid return pipe 114, a first liquid inlet pipe 115, a first liquid sampling pipe 116 and a first insulation layer 117. Figure 4 As shown, the second constant temperature device 12 of the embodiment of the present invention includes a second constant temperature jacket 121, a second liquid constant temperature tank 122, a second liquid circulation pump 123, a second liquid reflux pipe 124, a second liquid inlet pipe 125, a second liquid sampling pipe 126 and a second insulation layer 127.

[0037] The temperature measurement system 14 of the embodiment of the present invention is as follows Figure 5 As shown, it includes a thermometer 144 and a first standard thermometer 141, a second standard thermometer 142 and a third standard thermometer 143 connected to the thermometer 144. The thermometer 144 can be a resistance thermometer. The first standard thermometer 141, the second standard thermometer 142 and the third standard thermometer 143 are used to measure the temperature values ​​of the first liquid thermostatic bath 112, the second liquid thermostatic bath 122 and the thermostatic box 13 respectively.

[0038] The structures of the first thermostatic sleeve 111 of the first thermostatic device 11 and the second thermostatic sleeve 121 of the second thermostatic device 12 are as follows: Figure 6 , Figure 7 , Figure 8 , Fig. 9 and Fig.10 As shown, Figure 1 The installation position in is the reference surface. The first constant temperature jacket 111 includes a first test cavity 1111, a first liquid flow interlayer, and a first liquid inlet hole 1112 and a first liquid reflux hole 1113 communicating with the first liquid flow interlayer.

[0039] The middle hollow part of the first thermostatic sleeve 111 is the first test cavity 1111, and the black ball temperature sensor 21 of the calibrated WBGT indexer 2 is installed in the first test cavity 1111. One end of the first liquid inlet pipe 115 of the first thermostatic device 11 is connected to the first liquid inlet hole 1112 of the first thermostatic sleeve 111, and the other end of the first liquid inlet pipe 115 is connected to the outlet of the first liquid circulation pump 113, and the first liquid return pipe 114 is connected to the first liquid return hole 1113, and the other end of the first liquid return pipe 114 is placed in the first liquid thermostatic tank 112, one end of the first liquid sampling pipeline 116 of the first liquid circulation pump 113 is connected to the inlet position of the first liquid circulation pump 113, and the other end of the first liquid sampling pipeline 116 is placed in the first liquid thermostatic tank 112, and the first thermostatic sleeve 111, the outer surfaces of the first liquid return pipe 114 and the first liquid inlet pipe 115 are provided with a first insulation layer 117 constructed of insulation material, so that the entire medium circulation loop has good insulation performance. The first liquid circulation pump 113 flows the liquid medium such as silicone oil, water or alcohol with a specified temperature value in the first liquid thermostatic tank 112 into the first liquid flow interlayer of the internal hollow structure of the first thermostatic sleeve 111 through the first liquid inlet pipe 115, and the liquid medium then flows back to the first liquid thermostatic tank 112 through the first liquid return pipe 114. The circulation is repeated in this way, and the liquid medium with a constant temperature value flows rapidly in the interlayer space of the liquid first thermostatic sleeve 111, which can ensure that the first test cavity 1111 of the first thermostatic sleeve 111 has a sufficiently stable and uniform temperature field within the temperature range of 5°C to 120°C.

[0040] The second constant temperature jacket 121 includes a second test cavity 1211 , a second liquid flow interlayer, and a second liquid inlet hole 1211 and a second liquid reflux hole 1213 communicating with the second liquid flow interlayer.

[0041] The middle hollow part of the second thermostatic sleeve 121 is a second test cavity 1211. The wet bulb temperature sensor 22 of the calibrated WBGT indexer 2 is installed in the second test cavity 1211. One end of the second liquid inlet pipe 125 of the second thermostatic device 12 is connected to the second liquid inlet hole 1212. At the same time, the other end of the second liquid inlet pipe 125 is connected to the outlet of the second liquid circulation pump 123. One end of the second liquid return pipe 124 of the second thermostatic sleeve 121 is connected to the second liquid return hole 1213. At the same time, the other end of the second liquid reflux pipe 124 is placed in the second liquid constant temperature tank 122, one end of the second liquid sampling pipe 126 is connected to the inlet position of the second liquid circulation pump 123, and the other end of the second liquid sampling pipe 126 is placed in the second liquid constant temperature tank 122. The outer surfaces of the second constant temperature jacket 121, the second liquid reflux pipe 124 and the second liquid inlet pipe 125 are all provided with a second insulation layer 127 constructed of insulation material, so that the entire medium circulation loop has good insulation performance. The second liquid circulation pump 123 causes the liquid medium such as silicone oil, water or alcohol with a specified temperature value in the second liquid thermostatic bath 122 to flow into the second liquid flow interlayer of the internal hollow structure of the second thermostatic jacket 121 through the second liquid inlet pipe 125, and the liquid medium then flows back to the second liquid thermostatic bath 122 through the second liquid return pipe 124. The circulation is repeated in this way, and the liquid medium with a constant temperature value flows rapidly in the interlayer space of the liquid second thermostatic jacket 121, which can ensure that the second test cavity 1211 of the second thermostatic jacket 121 has a sufficiently stable and uniform temperature field within the temperature range of 5°C to 120°C.

[0042] The structures of the first thermostatic sleeve 111 and the second thermostatic sleeve 121 have the following characteristics:

[0043] (1) Dimensional characteristics: In order to ensure that the black ball temperature sensor 21 and the wet bulb temperature sensor 22 of the calibrated WBGT indexer 2 have a sufficiently good heat exchange with the corresponding first thermostatic jacket 111 and the second thermostatic jacket 121, the inner diameter of the first test cavity 1111 of the first thermostatic jacket 111 is as close to the outer diameter of the black ball temperature sensor 21 as possible, and the inner diameter of the second test cavity 1211 of the second thermostatic jacket 121 is as close to the outer diameter of the wet bulb temperature sensor 22 as possible; since the black ball temperature sensor 21 and the wet bulb temperature sensor 22 of the WBGT indexer 2 2 and the dry-bulb temperature sensor 23, the outer diameters of the first thermostatic sleeve 111 and the second thermostatic sleeve 121 should be as small as possible. The dimensions (outer diameter mm×inner diameter mm×length mm) of the first thermostatic sleeve 111 and the second thermostatic sleeve 121 used in this embodiment are: Φ33.5×Φ5.5×90, Φ34.5×Φ6.5×90, Φ35.5×Φ7.5×90, and the dimensions of the effective working area in the test cavity (inner diameter mm×depth mm) are: Φ5.5×80, Φ6.5×80, Φ7.5×80;

[0044] (2) Structural features, such as Figure 3 As shown, the inner space of the first thermostatic jacket 111 adopts a hollow structure, and forms a circulation loop with the corresponding first liquid thermostatic tank 112, the first liquid circulation pump 113, the first liquid return pipe 114, the first liquid inlet pipe 115 and the liquid collection pipe 116, so as to ensure that the temperature medium of the first liquid thermostatic tank 112 can flow quickly in the first thermostatic jacket 111 under the drive of the first liquid circulation pump 113; Figure 4 As shown, the inner space of the second thermostatic jacket 121 adopts a hollow structure, and forms a circulation loop with the corresponding second liquid thermostatic tank 122, the second liquid circulation pump 123, the second liquid return pipe 124 and the second liquid inlet pipe 125, respectively, to ensure that the temperature medium of the second liquid thermostatic tank 122 can flow quickly in the second thermostatic jacket 121 under the drive of the second liquid circulation pump 123;

[0045] (3) Performance characteristics: A first insulation layer 117 is constructed of the first thermostatic jacket 111, the first liquid return pipe 114 and the first liquid inlet pipe 115 using an insulation material, so as to provide good insulation for the liquid circulation loop of the first thermostatic jacket 111, thereby preventing the first thermostatic jacket 111, the first liquid return pipe 114 and the first liquid inlet pipe 115 from affecting the air temperature in the standard thermostatic box 13 due to heat leakage. At the same time, the temperature value in the first test cavity 1111 of the first thermostatic jacket 111 is ensured to be close to the temperature value of the corresponding first liquid thermostatic bath 112, and the temperature field in the first test cavity 1111 has the temperature stability and uniformity that meet the calibration requirements. A second insulation layer 127 is constructed of the second thermostatic jacket 121, the second liquid return pipe 124 and the second liquid inlet pipe 125 using insulation materials, so as to well insulate the liquid circulation loop of the second thermostatic jacket 121, thereby preventing the second thermostatic jacket 121, the second liquid return pipe 124 and the second liquid inlet pipe 125 from affecting the air temperature in the standard thermostatic box 13 due to heat leakage, and at the same time ensuring that the temperature value in the second test cavity 1211 of the second thermostatic jacket 121 is close to the temperature value of the corresponding second liquid thermostatic bath 122, and ensuring that the temperature field in the second test cavity 1211 of the second thermostatic jacket 121 has temperature stability and uniformity that meet calibration requirements.

[0046] The first test cavity 1111 of the first thermostatic sleeve 111 and the second test cavity 1211 of the second thermostatic sleeve 121 have a temperature stability of ±0.01°C within the temperature range of 5°C to 120°C, a temperature uniformity of 0.01°C within the temperature range of 5°C to 60°C, and a temperature uniformity of 0.03°C within the temperature range of higher than 60°C and lower than or equal to 120°C (since the inner diameter of the first test cavity 1111 of the first thermostatic sleeve 111 matches the outer diameter of the black ball temperature sensor 21, its uniformity refers to the axial temperature difference of the first test cavity 1111 of the first thermostatic sleeve 111, and since the inner diameter of the second test cavity 1211 of the second thermostatic sleeve 121 matches the outer diameter of the wet-bulb temperature sensor 22, its uniformity refers to the axial temperature difference of the second test cavity 1211 of the second thermostatic sleeve 121).

[0047] The embodiment of the present invention further provides a WBGT indexer temperature sensor calibration method, which uses the WBGT indexer temperature sensor calibration device 1 of the embodiment of the present invention to calibrate the WBGT indexer 2 to be calibrated.

[0048] First, follow Figure 1 As shown, the measuring ends of the calibrated WBGT indexer 2 and the third standard thermometer 143 of the temperature measurement system 14 are placed in the effective working space of the standard constant temperature box 13, the measuring end of the first standard thermometer 141 of the temperature measurement system 14 is placed in the effective working space of the first liquid constant temperature bath 112, and the measuring end of the second standard thermometer 142 of the temperature measurement system 14 is placed in the effective working space of the second liquid constant temperature bath 122. The first standard thermometer 141, the second standard thermometer 142 and the third standard thermometer 143 are all connected to the thermometer 144. At the same time, the black ball temperature sensor 21 of the WBGT indexer 2 is placed in the first test cavity 1111 of the first constant temperature jacket 111, and the wet bulb temperature sensor 22 of the WBGT indexer 2 is placed in the second test cavity 1211 of the second constant temperature jacket 121.

[0049] Secondly, the temperature values ​​of the standard thermostatic box 13, the first liquid thermostatic bath 112 and the second liquid thermostatic bath 122 are set as temperature calibration points and started to run, and the first liquid circulation pump 113, the second liquid circulation pump 123, the thermometer 144 and the calibrated WBGT index meter 2 are started at the same time. After the actual temperatures of the thermostatic box 13, the first liquid thermostatic bath 112 and the second liquid thermostatic bath 122 reach the set values ​​and stabilize for a sufficient time, the first standard thermometer 141, the second standard thermometer 142 and the third standard thermometer 143 of the temperature measuring system 14 are used to measure the actual temperatures of the first liquid thermostatic bath 112 and the second liquid thermostatic bath 122. 2. The temperature values ​​of the second liquid thermostatic bath 122 and the thermostatic box 13. Since the first thermostatic device 11 and the second thermostatic device 12 adopt good thermal insulation measures, the heat loss of the liquid medium in the first liquid thermostatic bath 112 and the second liquid thermostatic bath 122 in the entire circulation loop is almost negligible. Therefore, the temperature value in the first test cavity 1111 of the first thermostatic sleeve 111 is equal to the measured value of the first standard thermometer 141 in the temperature measurement system 14, and the temperature value in the second test cavity 1211 of the second thermostatic sleeve 121 is equal to the measured value of the second standard thermometer 142 in the temperature measurement system 14.

[0050] Finally, suppose the temperature indications of the first standard thermometer 141, the second standard thermometer 142 and the third standard thermometer 143 in the temperature measurement system 14 are T 141 , T 142 and T 143 The temperature indications of the black ball temperature sensor 21, the wet ball temperature sensor 22 and the dry ball temperature sensor 23 of the WBGT index instrument 2 are T 21 , T 22 and T 23 After the temperatures of the thermostatic box 13, the first liquid thermostatic bath 112 and the second liquid thermostatic bath 122 are sufficiently stable, the temperature indications of the first standard thermometer 141, the second standard thermometer 142, the third standard thermometer 143 in the temperature measurement system 14 and the black ball temperature sensor 21, the wet bulb temperature sensor 22 and the dry bulb temperature sensor 23 of the WBGT indexer 2 are read respectively, and the error values ​​are calculated by equations (1), (2) and (3), that is, the calibration of the black ball temperature sensor 21, the wet bulb temperature sensor 22 and the dry bulb temperature sensor 23 of the WBGT indexer 2 at the corresponding temperature calibration point is completed under the condition of the ambient temperature (the same as the indication of the dry bulb temperature sensor 23).

[0051] ΔT 21 =T 21 -T 141 (1)

[0052] ΔT 22 =T 22 -T 142 (2)

[0053] ΔT 23 =T 23 -T 143 (3)

[0054] Where, ΔT 21 is the error value of the black ball temperature sensor, ΔT 22 is the error value of the wet bulb temperature sensor, ΔT 23 is the error value of the dry-bulb temperature sensor.

[0055] Taking the calibration point 120° C. of the black bulb temperature sensor 21 , the calibration point 5° C. of the wet bulb temperature sensor 22 , and the calibration point 60° C. of the dry bulb temperature sensor 23 as examples, the calibration method of the embodiment of the present invention is further described in detail.

[0056] First, the measuring ends of the WBGT indexer 2 and the third standard thermometer 143 of the temperature measurement system 14 are placed in the effective working space of the standard constant temperature box 13, the measuring end of the first standard thermometer 141 of the temperature measurement system 14 is placed in the first liquid constant temperature tank 112, and the measuring end of the second standard thermometer 142 of the temperature measurement system 14 is placed in the second liquid constant temperature tank 122. At the same time, the black ball temperature sensor 21 of the WBGT indexer 2 is placed in the first test cavity 1111 of the first constant temperature sleeve 111, the first liquid inlet hole 1112 is connected to the first liquid circulation pump 113 through the first liquid inlet pipe 115, the first liquid sampling pipe 116 of the first liquid circulation pump 113 is placed in the first liquid constant temperature tank 112, the first liquid reflux hole 1113 is connected to the first liquid reflux pipe 114, and the other end of the first liquid reflux pipe 114 is placed in the first liquid constant temperature tank 112. The wet-bulb temperature sensor 22 of the WBGT indexer 2 is placed in the second test cavity 1211 of the second constant temperature sleeve 121, the second liquid inlet hole 1212 is connected to the second liquid circulation pump 123 through the second liquid inlet pipe 125, the second liquid sampling pipe 126 of the second liquid circulation pump 123 is placed in the second liquid constant temperature tank 122, the second liquid reflux hole 1213 is connected to the second liquid reflux pipe 124, and the other end of the second liquid reflux pipe 124 is placed in the second liquid constant temperature tank 122.

[0057] Secondly, the temperatures of the standard thermostatic box 13, the first liquid thermostatic tank 112 and the second liquid thermostatic tank 122 are set to 60°C, 120°C and 5°C respectively and started, and the thermometer 144, the WBGT index meter 2, the first liquid circulation pump 113 and the second liquid circulation pump 123 are started at the same time. After the temperatures of the standard thermostatic box 13, the first liquid thermostatic tank 112 and the second liquid thermostatic tank 122 reach the set temperature values ​​and stabilize for 30 minutes, the temperature indications of the first standard thermometer 141, the second standard thermometer 142 and the third standard thermometer 143 and the temperature indications of the black ball temperature sensor 21, the wet bulb temperature sensor 22 and the dry bulb temperature sensor 23 of the WBGT index meter 2 are read and recorded respectively.

[0058] Finally, the temperature error is calculated according to the recorded data by using equations (1), (2) and (3), that is, the calibration of the WBGT index meter 2 is completed under the condition that the air temperature is 60°C, the calibration point of the black bulb temperature sensor 21 is 120°C, the calibration point of the wet bulb temperature sensor 22 is 5°C, and the calibration point of the dry bulb temperature sensor 23 is 60°C.

[0059] The above method is used to calibrate the black bulb temperature sensor 21, the wet bulb temperature sensor 22 and the dry bulb temperature sensor 23 of the WBGT index meter 2 at other temperature calibration points, and finally completes and realizes the calibration of the wet bulb temperature sensor, the dry bulb temperature sensor and the black bulb temperature sensor of the WBGT index meter 2 under the specified air temperature conditions.

[0060] According to the WBGT indexer temperature sensor calibration device and method of the embodiment of the present invention, an independent temperature field is provided for the WBGT indexer and the dry-bulb temperature sensor of the WBGT indexer through a standard thermostatic box, and two independent temperature fields are provided for the black ball temperature sensor and the wet-bulb temperature sensor of the WBGT indexer respectively through two sets of thermostatic devices. The temperature values ​​of the standard thermostatic box and the two liquid thermostatic baths are measured by the temperature measurement system, that is, when providing the WBGT indexer (including the dry-bulb temperature sensor) with an independent temperature field whose temperature can be arbitrarily adjusted within the range of 10°C to 60°C, it can also provide the black ball temperature sensor with an independent temperature field whose temperature can be arbitrarily adjusted within the range of 20°C to 120°C, and provide the wet-bulb temperature sensor with an independent temperature field whose temperature can be arbitrarily adjusted within the range of 5°C to 40°C, thereby independently providing different temperature conditions for the black ball temperature sensor, the wet-bulb temperature sensor and the WBGT indexer (including the dry-bulb temperature sensor) at the same time, thereby meeting the need for tracing the WBGT indexer under the temperature conditions actually used.

[0061] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A WBGT index meter temperature sensor calibration device, characterized in that: It includes a first constant temperature device, a second constant temperature device, a standard constant temperature box and a temperature measurement system. The calibrated WBGT indexer includes a black bulb temperature sensor, a wet bulb temperature sensor and a dry bulb temperature sensor. The standard thermostatic box is used to place the calibrated WBGT indexer and calibrate the dry bulb temperature sensor. The first thermostatic device is used to calibrate the black bulb temperature sensor, and the second thermostatic device is used to calibrate the wet bulb temperature sensor. The first constant temperature device comprises a first constant temperature jacket, a first liquid constant temperature tank, a first liquid circulation pump, a first liquid reflux pipe, a first liquid inlet pipe, a first liquid sampling pipe and a first insulation layer, and the first constant temperature jacket comprises a first test cavity, a first liquid flow interlayer and a first liquid inlet hole and a first liquid reflux hole connected to the first liquid flow interlayer; The first test cavity is used to place the black ball temperature sensor, one end of the first liquid inlet tube is connected to the first liquid inlet hole, the other end of the first liquid inlet tube is connected to the outlet of the first liquid circulation pump, the first liquid return tube is connected to the first liquid return hole, the other end of the first liquid return tube is placed in the first liquid constant temperature tank, one end of the first liquid sampling pipeline is connected to the inlet of the first liquid circulation pump, the other end of the first liquid sampling pipeline is placed in the first liquid constant temperature tank, the outer surfaces of the first constant temperature jacket, the first liquid return tube and the first liquid inlet tube are all provided with a first insulation layer, and the first liquid circulation pump is used to make the liquid medium in the first liquid constant temperature tank flow into the first liquid flow interlayer through the first liquid inlet tube and flow back to the first liquid constant temperature tank through the first liquid return tube; The second constant temperature device includes a second constant temperature jacket, a second liquid constant temperature tank, a second liquid circulation pump, a second liquid reflux pipe, a second liquid inlet pipe, a second liquid sampling pipe and a second insulation layer, and the second constant temperature jacket includes a second test cavity, a second liquid flow interlayer and a second liquid inlet hole and a second liquid reflux hole connected to the second liquid flow interlayer; The second test cavity is used to place the wet-bulb temperature sensor, one end of the second liquid inlet pipe is connected to the second liquid inlet hole, the other end of the second liquid inlet pipe is connected to the outlet of the second liquid circulation pump, one end of the second liquid return pipe is connected to the second liquid return hole, the other end of the second liquid return pipe is placed in the second liquid constant temperature tank, one end of the second liquid sampling pipeline is connected to the inlet of the second liquid circulation pump, the other end of the second liquid sampling pipeline is placed in the second liquid constant temperature tank, the outer surfaces of the second constant temperature jacket, the second liquid return pipe and the second liquid inlet pipe are all provided with a second insulation layer, and the second liquid circulation pump is used to make the liquid medium in the second liquid constant temperature tank flow into the second liquid flow interlayer through the second liquid inlet pipe and flow back to the second liquid constant temperature tank through the second liquid return pipe; The temperature measurement system includes a thermometer and a first standard thermometer, a second standard thermometer and a third standard thermometer connected to the thermometer. The first standard thermometer, the second standard thermometer and the third standard thermometer are used to measure the temperature values ​​of the first liquid thermostatic bath, the second liquid thermostatic bath and the thermostatic box respectively.

2. The device according to claim 1, characterized in that The first insulation layer is used to insulate the liquid circulation loop of the first thermostatic jacket, so as to prevent the first thermostatic jacket, the first liquid return pipe and the first liquid inlet pipe from affecting the air temperature in the standard thermostatic box due to heat leakage, ensure that the temperature value in the first test cavity is close to the temperature value of the first liquid thermostatic bath, and ensure that the temperature field in the first test cavity has temperature stability and uniformity that meet the calibration requirements; The second insulation layer is used to insulate the liquid circulation loop of the second thermostatic jacket to prevent the second thermostatic jacket, the second liquid return pipe and the second liquid inlet pipe from affecting the air temperature in the standard thermostatic box due to heat leakage, ensure that the temperature value in the second test cavity is close to the temperature value of the second liquid thermostatic bath, and ensure that the temperature field in the second test cavity has temperature stability and uniformity that meet the calibration requirements.

3. The device according to claim 2, characterized in that The temperature stability of the first test cavity and the second test cavity reaches ±0.01°C in the temperature range of 5°C to 120°C, the temperature uniformity reaches 0.01°C in the temperature range of 5°C to 60°C, and the temperature uniformity reaches 0.03°C in the temperature range above 60°C and below or equal to 120°C.

4. The device according to any one of claims 1 to 3, characterized in that The inner diameter of the first test cavity is approximately consistent with the outer diameter of the black ball temperature sensor, and the inner diameter of the second test cavity is approximately consistent with the outer diameter of the wet ball temperature sensor.

5. The device according to any one of claims 1 to 3, characterized in that The liquid medium is silicone oil, water or alcohol.

6. A method for calibrating a temperature sensor of a WBGT indexer, characterized in that: Using the device described in any one of claims 1 to 5 to calibrate the WBGT indexer to be calibrated, comprising: Place the measuring ends of the calibrated WBGT index meter and the third standard thermometer in a standard constant temperature box, place the measuring end of the first standard thermometer in a first liquid constant temperature bath, place the measuring end of the second standard thermometer in a second liquid constant temperature bath, place the black ball temperature sensor in the first test cavity, and place the wet ball temperature sensor in the second test cavity; The temperature values ​​of the standard thermostatic box, the first liquid thermostatic bath, and the second liquid thermostatic bath are respectively set as temperature calibration points, and the temperature values ​​of the first liquid thermostatic bath, the second liquid thermostatic bath, and the thermostatic box are respectively measured using a first standard thermometer, a second standard thermometer, and a third standard thermometer; Assume that the temperature indications of the first standard thermometer, the second standard thermometer and the third standard thermometer are T 141 , T 142 and T 143 The temperature indications of the black ball temperature sensor, wet ball temperature sensor and dry ball temperature sensor are T 21 , T 22 and T 23 , calculate the error value as follows to complete the calibration of the black bulb temperature sensor, wet bulb temperature sensor and dry bulb temperature sensor at the set temperature calibration point: ΔT 21 =T 21 -T 141 ΔT 22 =T 22 -T 142 ΔT 23 =T 23 -T 143 , Where, ΔT 21 is the error value of the black ball temperature sensor, ΔT 22 is the error value of the wet bulb temperature sensor, ΔT 23 is the error value of the dry-bulb temperature sensor.

7. The method according to claim 6, characterized in that Set the temperature values ​​of the standard thermostatic box, the first liquid thermostatic bath and the second liquid thermostatic bath to 60℃, 120℃ and 5℃ respectively, and complete the calibration of the WBGT indexer under the condition of air temperature of 60℃, the calibration point of the black bulb temperature sensor is 120℃, the calibration point of the wet bulb temperature sensor is 5℃ and the calibration point of the dry bulb temperature sensor is 60℃.

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