Calibration device

Abstract

The present application provides a calibration device, which relates to the technical field of heat flux meters. A conductive heat flux meter has a first surface and a second surface facing away from each other, and the first surface is formed as a plane. The calibration device includes: a power output mechanism for providing the power to generate heat flux; a data acquisition mechanism communicatively connected to both the power output mechanism and the conductive heat flux meter for data acquisition; the calibration device includes: a heating mechanism disposed on the side of the first surface of the conductive heat flux meter and electrically connected to the power output mechanism, and the heating mechanism is used to heat the first surface so that the second surface of the conductive heat flux meter is open; the data acquisition mechanism can perform Riemann integral calculation on the collected data. The present application adopts a single hot plate and an open design on the cold side, and uses the Riemann integral method for deviation correction, so that calibration can be performed even when the back surface of the conductive heat flux meter is non-planar, and thus has good applicability.

Description

Technical Field

[0001] This application relates to the technical field of heat flux meters, and particularly to a calibration device. Background Art

[0002] A heat flux meter is an instrument for measuring the heat flux per unit area and is used to quantify heat energy transfer or transfer. Due to different manufacturing levels and detection and calibration methods of heat flux meter manufacturers, there are significant differences in the measurement accuracy of heat flux meters. Therefore, heat flux meters need to be calibrated. Existing conduction-type heat flux meter calibration devices are mainly divided into the absolute method and the relative method.

[0003] The absolute method, for example, includes the guarded hot plate method and the foil heating method. In the guarded hot plate method, a hot plate and a cold plate sandwich the heat flux sensor in the middle. By controlling the temperatures and powers of the hot plate and the cold plate, a stable heat flux is obtained, and the heat flux meter is calculated by measuring the power of the main heater. The foil heating method has a similar principle to the guarded hot plate method. The main difference is that a heating foil is used instead of the hot plate in the guarded hot plate method, and the heat flux is calculated by measuring the power of the heating foil. The relative method uses a hot plate and a cold plate to sandwich the heat flux sensor in the middle to generate a stable heat flux. The same-shaped and sized standard heat flux meter and the heat flux meter to be tested are stacked or symmetrically placed together, and the error is measured by comparing the standard heat flux meter and the heat flux meter to be tested.

[0004] However, whether it is the absolute method or the relative method, both use a calibration method that combines a hot plate and a cold plate, and it is difficult to accurately detect a heat flux meter with only one side surface not being flat. In addition, the structure of the guarded hot plate method is relatively complex. Especially under low heat flux conditions, temperature fluctuations have a greater impact on the measurement results. High temperature accuracy requirements are required for the hot plate, cold plate, and protection plate during calibration, so the balancing time is long. The heat capacity of the foil heater itself is extremely small, and it is easily affected by the temperature fluctuations of the protection plate during calibration. The relative method requires a heat flux meter with the same shape and size. In actual calibration, the shapes of heat flux sensors are diverse, so the relative method has obvious limitations. Summary of the Invention

[0005] In view of this, this application provides a calibration device, aiming to solve to a certain extent the technical problem that in the existing technology, whether it is the absolute method or the relative method, both use a calibration method that combines a hot plate and a cold plate, and it is difficult to accurately detect a heat flux meter with only one side surface not being flat.

[0006] This application provides a calibration device for calibrating a conduction-type heat flux meter. The conduction-type heat flux meter has a first surface and a second surface facing each other, and the first surface is formed as a plane. The calibration device includes:

[0007] A power output mechanism for providing the power to generate heat flux;

[0008] A data acquisition mechanism, communicatively connected to both the power output mechanism and the conduction heat flow meter for data acquisition;

[0009] The calibration device includes:

[0010] A heating mechanism, disposed on the first surface side of the conduction heat flow meter and electrically connected to the power output mechanism, the heating mechanism being configured to heat the first surface so that the second surface of the conduction heat flow meter is open;

[0011] The data acquisition mechanism is capable of performing Riemann integral calculation on the acquired data.

[0012] Preferably, the heating mechanism includes a main heating assembly, and the main heating assembly includes:

[0013] A main heating member, having a third surface and a fourth surface facing away from each other, and a side surface extending between the third surface and the fourth surface, the main heating member being electrically connected to the power output mechanism, the third surface being completely adhered to the first surface so that the main heating member heats the first surface;

[0014] A first heat insulation member, disposed on the fourth surface side of the main heating member and covering the outside of the side surface, the first heat insulation member being formed of a heat insulation material.

[0015] Preferably, the heating mechanism further includes a protection heating assembly, the protection heating assembly being disposed on the side of the first heat insulation member facing away from the main heating member and covering the remaining outer surfaces of the first heat insulation member except the surface close to the conduction heat flow meter, the protection heating assembly heating the first heat insulation member so that the heat loss of the main heating member through the fourth surface and the side surface is zero.

[0016] Preferably, the protection heating assembly includes:

[0017] A protection heating member, disposed on the side of the first heat insulation member facing away from the main heating member and covering the remaining outer surfaces of the first heat insulation member except the surface close to the conduction heat flow meter;

[0018] A second heat insulation member, disposed on the side of the protection heating member facing away from the first heat insulation member and covering the remaining outer surfaces of the protection heating member except the surface close to the conduction heat flow meter.

[0019] Preferably, the calibration device further includes:

[0020] A temperature control mechanism, which is electrically connected to the protection heating member and is used to adjust the temperature of the protection heating member so that the temperature of the protection heating member is consistent with the temperature of the main heating member.

[0021] Preferably, the calibration device further includes:

[0022] A first temperature sensor, which is arranged between the fourth surface and the first heat insulation member and transmits a first temperature signal to the temperature control mechanism;

[0023] A second temperature sensor, which is arranged between the first heat insulation member and the protection heating member and transmits a second temperature signal to the temperature control mechanism;

[0024] The temperature control mechanism compares the first temperature signal and the second temperature signal to control the temperature of the protection heating member to be consistent with the temperature of the main heating member.

[0025] Preferably, both the first heat insulation member and the second heat insulation member are formed as multi-layer structures.

[0026] Preferably, the main heating member and the protection heating member include the following structure: a heat conduction part, which is used to release heat to the outside and is formed of a metal material;

[0027] The heat conduction parts of the main heating member are evenly distributed within the main heating member;

[0028] The heat conduction parts of the protection heating member are evenly distributed within the protection heating member.

[0029] Preferably, the power output mechanism is driven by electric energy, and the power output mechanism is powered in a feedback regulation manner so that the power output mechanism outputs a constant power;

[0030] The power output mechanism is also powered in a manner of a predetermined noise and a predetermined ripple so that the uncertainty of data acquisition by the data acquisition mechanism is less than or equal to 3%.

[0031] Preferably, the heating mechanism can heat the conduction type heat flowmeter at a temperature higher than 500 degrees Celsius;

[0032] The heat flux density of the conduction type heat flowmeter can reach 10000W / m 2 .

[0033] The calibration device provided by the present application adopts a single hot plate and a cold side open design, and uses the Riemann integral method for deviation correction. Furthermore, it can be calibrated even when one side surface of the conduction type heat flowmeter is non-planar, so it has good applicability.

[0034] To make the above objects, features, and advantages of the present application more apparent and understandable, the following provides preferred embodiments in conjunction with the accompanying drawings and detailed descriptions are as follows. Description of the Drawings

[0035] To more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0036] Figure 1 Shows a schematic diagram of the calibration operation of the conductive heat flowmeter by the calibration device.

[0037] Reference Numerals:

[0038] 1 - Heat flowmeter under test; 2 - Main heating plate; 3 - First adiabatic member; 4 - Protection heater; 5 - Second adiabatic member; 6a - First temperature sensor; 6b - Second temperature sensor; 7 - Power output mechanism; 8 - Temperature control mechanism. Detailed Embodiments

[0039] The following will clearly and completely describe the technical solutions of the present application in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of them. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present application.

[0040] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0042] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those skilled in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0043] Figure 1 The schematic diagram shows the calibration operation of the conductive heat flowmeter by the calibration device. Refer to Figure 1 , the calibration device provided by this application includes: the heat flowmeter to be measured, the main heating plate, the first heat insulation member, the protection heater, the second heat insulation member, the first temperature sensor, the second temperature sensor, the power output mechanism and the temperature adjustment mechanism, as well as the data acquisition mechanism not shown in the figure. The relationship and working principle of the above components will be specifically described below.

[0044] It should be noted in advance that in this embodiment, the above heat flowmeter 1 to be measured is formed as a conductive heat flowmeter; Figure 1 The gaps between the components shown in (that is, the gap between the heat flowmeter 1 to be measured and the main heating plate 2, the gap between the main heating plate 2 and the first heat insulation member 3, the gap between the first heat insulation member 3 and the protection heater 4, and the gap between the second heat insulation member 5 and the protection heater 4) are all schematically given for clearly showing the positional relationship of the components. In fact, the components are in close contact with each other. In addition, for the convenience of the following description, taking the orientation shown in Figure 1 as an example, the upper surface of the heat flowmeter 1 to be measured can be defined as the back surface, and the lower surface of the heat flowmeter 1 to be measured can be defined as the front surface.

[0045] As mentioned in the above description, the front and back surfaces of the heat flowmeter 1 to be measured face each other. Although Figure 1 both the front and back surfaces shown in are flat surfaces, in fact, the back surface of the heat flowmeter 1 to be measured may not be a flat surface either. That is, when the front surface is a flat surface, in this embodiment, the shape of the back surface of the heat flowmeter 1 to be measured targeted by the calibration device is not specifically limited, which makes the calibration device in this embodiment have a wider applicability.

[0046] In the embodiment, the back surface of the heat flowmeter 1 to be measured is open (that is, the back surface is completely exposed to the external environment), and the upper surface of the main heating plate 2 is completely and tightly attached to the front surface of the heat flowmeter 1 to be measured (that is, the area of the upper surface of the main heating plate 2 is the same as that of the front surface of the heat flowmeter 1 to be measured) to quickly heat the heat flowmeter 1 to be measured. The heat power output by the main heating plate 2 is realized by the power output mechanism 7 electrically connected to the main heating plate 2. That is, the power output mechanism 7 provides the power to generate heat flow, and the working mode of the power output mechanism 7 will be given in the subsequent description.

[0047] The main heating plate 2 is formed with a heat-conducting part that releases heat to the outside for heating. The heat-conducting part can be formed of a metal material. As a preferable option, it can be formed of red copper, for example. Due to the high heat-conducting property of red copper, the temperature range and the heat flux density range during the calibration process can be effectively adjusted. Further, the heat-conducting parts can be evenly distributed within the main heating plate 2. For example, they are formed by folding a filamentous red copper back and forth within the main heating plate 2 to ensure that the heat released from the upper surface of the main heating plate 2 is uniform, which is beneficial to accelerating the balancing speed of the heat flow meter 1 to be measured.

[0048] The power output mechanism 7 can be driven by electric energy, and the power output mechanism 7 can supply power to the main heating plate 2 in a feedback regulation manner, so as to ensure that the power output mechanism 7 outputs a constant power, which is convenient for accelerating the balancing speed of the heat flow meter 1 to be measured and also convenient for the following data acquisition operation and calibration calculation. Further, the power output mechanism 7 also supplies power to the main heating plate 2 in a low-noise and low-ripple manner, thus reducing the uncertainty during the data acquisition process. As a preferable option, the uncertainty of the data acquisition by the following data acquisition mechanism is limited to be less than or equal to 3%. In this way, when the back surface of the heat flow meter 1 to be measured is open, other possible factors that increase the data acquisition uncertainty are reduced to the lowest as much as possible to ensure the reliability of the calibration calculation result.

[0049] In the embodiment, a first heat-insulating member 3 can be provided below the main heating plate 2. The first heat-insulating member 3 can be formed into a multi-layer structure, and these multi-layer structures can be respectively formed of various heat-insulating materials. As Figure 1 shown, the first heat-insulating member 3 covers other surfaces of the main heating plate 2 except the upper surface (that is, the first heat-insulating member 3 is formed with a groove portion for accommodating the main heating plate 2). In this way, in combination with the heat-insulating property of the first heat-insulating member 3, the heat lost by the main heating plate 2 through its side surface and lower surface is reduced as much as possible, which is also beneficial to accelerating the balancing speed of the heat flow meter 1 to be measured.

[0050] Further, below the first heat-insulating member 3, a protection heater 4 can also be provided. The shape of the protection heater 4 can be similar to that of the first heat-insulating member 3, that is, the protection heater 4 can also be formed with a groove portion for accommodating the first heat-insulating member 3. Therefore, other surfaces of the first heat-insulating member 3 except the upper surface can be covered and heated by the protection heater 4 (in addition, the protection heating member also includes the above-mentioned heat-conducting part, and the setting method is also roughly the same as that of the above heat-conducting part, the difference being that the inner part of the groove of the protection heating member is also evenly distributed with the heat-conducting part). The purpose of such a setting is that when the main heating plate 2 provides a relatively high heating temperature, the lower surface and side surface of the first heat-insulating member 3 will inevitably have a temperature difference with the external environment and heat exchange will occur, which will still cause heat loss of the main heating plate 2.

[0051] Therefore, when the temperature inside the groove of the protection heater 4 is the same as the temperature of the lower surface of the main heating plate 2, the above heat loss is zero, which is also beneficial to effectively shorten the equilibrium time and improve the calibration efficiency. The so-called "heat loss is zero" is an ideal state. In fact, due to inevitable instrument errors and possible assembly errors between heating devices, etc., the heat loss can only approach zero. Therefore, "heat loss approaching zero" can also be regarded as "heat loss being zero".

[0052] The above heating method of the protection heater 4 can be achieved through the following setting method. In the embodiment, the first temperature sensor 6a can be arranged between the lower surface of the main heating plate 2 and the first heat insulation member 3, and send the first temperature signal to the temperature control mechanism 8. The first temperature signal is the signal of the temperature of the lower surface of the main heating plate 2 mentioned above. The second temperature sensor 6b can be arranged between the first heat insulation member 3 and the protection heating member, and send the second temperature signal to the temperature control mechanism 8. The second temperature signal is the temperature inside the groove of the protection heater 4. The temperature control mechanism 8 can compare the first temperature signal and the second temperature signal to control the temperature of the protection heating member to be consistent with the temperature of the main heating member.

[0053] On the basis of the above setting method, a second heat insulation member 5 is further arranged on the lower side of the protection heater 4. The second heat insulation member 5 also covers other surfaces of the protection heater 4 except its upper surface, further reducing heat loss. In addition, the second heat insulation member 5 can adopt the same layer structure as the above-mentioned first heat insulation member 3, which will not be elaborated here.

[0054] In the embodiment, the calibration device further includes Figure 1 a data acquisition mechanism not shown in the figure. The data acquisition mechanism can be communicatively connected to both the power output mechanism 7 and the measured heat flow meter 1 to perform data acquisition. That is, the data acquisition mechanism acquires the constant power output by the power output mechanism 7 and the electromotive force output by the measured heat flow meter 1. On the basis of the above-described features, when the electromotive force output by the measured heat flow meter 1 is stable within the standard range, it can be regarded that the measured heat flow meter 1 reaches the equilibrium state. At this time, the data acquisition mechanism acquires the above-mentioned data through a predetermined data acquisition frequency, calculates the heat flux density using the constant power, and then corrects the deviation by the method of Riemann integral to obtain the heat flow meter coefficient, completing the calibration of the measured heat flow meter 1.

[0055] As a preferred option, the heating mechanism in this embodiment can heat the conduction type heat flow meter at a temperature higher than 500 degrees Celsius, and the heat flux density of the conduction type heat flow meter can reach 10000W / m 2 , which is particularly beneficial to increasing the calibration temperature range and heat flux range, thereby increasing the applicability of the calibration device.

[0056] The calibration device provided in this embodiment adopts a single hot plate and an open design on the cold side, and uses the Riemann integral method for deviation correction. Therefore, it can be calibrated even when the back surface of the conduction heat flowmeter is non-planar, so it has good applicability.

[0057] The above are only the preferred embodiments of the present application, and do not limit the protection scope of the present application. Any equivalent structural transformation made by using the content of the specification and drawings of the present application under the innovative concept of the present application, or any direct / indirect application in other related technical fields is included in the protection scope of the present application.

Claims

1. A calibration device for calibrating a conduction heat flowmeter, the conduction heat flowmeter having a first surface and a second surface facing away from each other, the first surface being formed as a plane; the calibration device comprising: A power output mechanism for providing power to generate heat flow; A data acquisition mechanism communicatively connected to both the power output mechanism and the conduction heat flowmeter for data acquisition; Characterized in that the calibration device comprises: A heating mechanism disposed on the side of the first surface of the conduction heat flowmeter and electrically connected to the power output mechanism, the heating mechanism being configured to heat the first surface such that the second surface of the conduction heat flowmeter is open and fully exposed to the external environment; The data acquisition mechanism is capable of performing Riemann integral calculation on the acquired data; The heating mechanism includes a main heating assembly, the main heating assembly comprising: A main heating member having a third surface and a fourth surface facing away from each other, and a side surface extending between the third surface and the fourth surface, the main heating member being electrically connected to the power output mechanism, the third surface being in complete contact with the first surface such that the main heating member heats the first surface; A first heat insulation member disposed on the side of the fourth surface of the main heating member and covering the outside of the side surface, the first heat insulation member being formed of a heat insulation material; The heating mechanism further includes a protection heating assembly disposed on the side of the first heat insulation member facing away from the main heating member and covering the remaining outer surfaces of the first heat insulation member except the surface close to the conduction heat flowmeter, the protection heating assembly heating the first heat insulation member such that the heat loss of the main heating member via the fourth surface and the side surface is zero.

2. The calibration device according to claim 1, wherein The protection heating assembly includes: A protection heating member disposed on the side of the first heat insulation member facing away from the main heating member and covering the remaining outer surfaces of the first heat insulation member except the surface close to the conduction heat flowmeter; A second heat insulation member disposed on the side of the protection heating member facing away from the first heat insulation member and covering the remaining outer surfaces of the protection heating member except the surface close to the conduction heat flowmeter.

3. The calibration device according to claim 2, wherein The calibration device further includes: A temperature control mechanism electrically connected to the protection heating member and configured to adjust the temperature of the protection heating member such that the temperature of the protection heating member is the same as the temperature of the main heating member.

4. The calibration device according to claim 3, characterized in that, The calibration device further includes: A first temperature sensor disposed between the fourth surface and the first heat insulation member and transmitting a first temperature signal to the temperature control mechanism; A second temperature sensor disposed between the first heat insulation member and the protection heating member and transmitting a second temperature signal to the temperature control mechanism; The temperature control mechanism compares the first temperature signal and the second temperature signal to control such that the temperature of the protection heating member is the same as the temperature of the main heating member.

5. The calibration device according to claim 3, characterized in that Both the first heat-insulating member and the second heat-insulating member are formed as multi-layer structures.

6. The calibration device according to claim 3, wherein the main heating member and the protection heating member include the following structures: a heat-conducting portion for releasing heat to the outside and formed of a metallic material; the heat-conducting portions of the main heating member are uniformly distributed within the main heating member; the heat-conducting portions of the protection heating member are uniformly distributed within the protection heating member.

7. The calibration device according to any one of claims 1 to 6, wherein the power output mechanism is driven by electric energy, and the power output mechanism is powered in a feedback regulation manner so that the power output mechanism outputs a constant power; the power output mechanism is also powered in a manner of a predetermined noise and a predetermined ripple so that the uncertainty of data acquisition by the data acquisition mechanism is less than or equal to 3%.

8. The calibration device according to claim 7, wherein the heating mechanism can heat the conduction type heat flowmeter at a temperature higher than 500 degrees Celsius; The heat flux density of the conduction heat flowmeter can reach 10000W / m 2 .

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