CN111579131A - Calibration device - Google Patents

Abstract

The application provides a calibration device, which relates to the technical field of heat flow meters, wherein a first surface and a second surface which are opposite to each other are formed on a conduction type heat flow meter, and the first surface is formed into a plane; the calibration device includes: a power output mechanism for providing power to generate heat flow; the data acquisition mechanism is in communication connection with the power output mechanism and the conduction type heat flow meter so as to acquire data; the calibration device includes: the heating mechanism is arranged on the first surface side of the conduction type heat flow meter and is electrically connected with the power output mechanism, and the heating mechanism is used for heating the first surface so that the second surface of the conduction type heat flow meter is opened; the data acquisition mechanism can perform Riemann integral calculation on the acquired data. The method adopts a single hot plate and cold side open design, and adopts a Riemann integral method to correct the deviation, so that the calibration can be carried out under the condition that the back surface of the conduction type heat flow meter is non-planar, and the method has good applicability.

Description

Calibration device

technical field

The present application relates to the technical field of heat flow meters, and in particular, to a calibration device.

Background technique

A heat flow meter is an instrument that measures heat flux per unit area and is used to quantify heat energy transfer or transfer. Due to the different manufacturing levels and detection and calibration methods of heat flow meter manufacturers, the measurement accuracy of heat flow meters is quite different, so heat flow meters need to be calibrated. Existing conduction heat flow meter calibration devices are mainly divided into absolute method and relative method.

Absolute methods include, for example, the protected hot plate method and the foil heating method, in which the protected hot plate method uses a hot plate and a cold plate to sandwich a heat flow sensor, and obtains a stable heat flow by controlling the temperature and power of the hot plate and the cold plate. The power of the main heater to calculate the heat flow meter. The principle of the foil heating method is similar to the protected hot plate method, the main difference is that the heating foil is used instead of the hot plate in the protected hot plate method, and the heat flow is calculated by measuring the power of the heating foil. The relative law uses a hot plate and a cold plate to sandwich the heat flow sensor to generate a stable heat flow. The standard heat flow meter and the measured heat flow meter of the same shape and size are stacked together or placed symmetrically. Compare to measure error.

However, both the absolute method and the relative method use the calibration method of the cooperation of the hot plate and the cold plate, and it is difficult to accurately detect the heat flow meter whose surface is not flat. In addition, the structure of the protection hot plate method is relatively complex, especially under the condition of low heat flow, the temperature fluctuation has a great influence on the measurement results, and the temperature accuracy of the hot plate, cold plate and protection plate is required to be high during calibration, so the equilibration time is long; the foil heater itself The heat capacity is extremely small, and it is easily affected by the temperature fluctuation of the protective plate during calibration; the relative method requires heat flow meters of the same shape and size. In actual calibration, the shape of the heat flow sensor is various, so the relative method has obvious limitations.

SUMMARY OF THE INVENTION

In view of this, the present application provides a calibration device, the purpose of which is to solve the problem to a certain extent that in the prior art, whether it is an absolute method or a relative method, both the hot plate and the cold plate are used for calibration. The technical problem that the plane heat flow meter is difficult to detect accurately.

The application provides a calibration device for calibrating a conduction heat flow meter, the conduction heat flow meter is formed with a first surface and a second surface facing away from each other, the first surface is formed as a plane; the calibration The device includes:

A power output mechanism for providing power to generate heat flow;

a data acquisition mechanism, connected in communication with both the power output mechanism and the conduction heat flow meter for data acquisition;

The calibration device includes:

A heating mechanism is arranged on the first surface side of the conduction heat flow meter, and is electrically connected to the power output mechanism, and the heating mechanism is used for heating the first surface, so that the the second surface is open;

The data collection mechanism can perform Riemann integral calculation on the collected data.

Preferably, the heating mechanism includes a main heating assembly, and the main heating assembly includes:

a main heating member formed with third and fourth surfaces facing away from each other, and a side surface extending between the third and fourth surfaces, the main heating member being electrically connected to the power output mechanism, the third surface and the first surface are in complete contact with each other, so that the primary heating member heats the first surface;

The first heat insulating member is provided on the fourth surface side of the main heating member and covers the outside of the side surface, and the first heat insulating member is formed of a heat insulating material.

Preferably, the heating mechanism further includes a protective heating assembly, the protective heating assembly is disposed on the side of the first heat insulating member facing away from the main heating member, and is covered on the other side of the first heat insulating member. Proximate the remaining outer surface of the surface of the conduction heat flow meter, the protective heating assembly heats the first insulating member such that the heat lost by the primary heating member via the fourth surface and the side surface is zero.

Preferably, the protective heating assembly includes:

a protective heating member, disposed on the side of the first heat insulating member facing away from the main heating member, and covering the remaining outer surfaces of the first heat insulating member except the surface close to the conduction heat flow meter;

The second heat insulating member is disposed on the side of the protective heating member facing away from the first heat insulating member, and covers the remaining outer surface of the protective heating member except the surface close to the conduction heat flow meter.

Preferably, the calibration device further comprises:

A temperature control mechanism is electrically connected to the protective heating member and used to adjust the temperature of the protective heating member so that the temperature of the protective heating member is consistent with the temperature of the main heating member.

Preferably, the calibration device further comprises:

a first temperature sensor, disposed between the fourth surface and the first heat insulating member, and delivering a first temperature signal to the temperature control mechanism;

a second temperature sensor, disposed between the first heat insulating member and the protective heating member, and delivering 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 the temperature of the protective heating member to be consistent with the temperature of the main heating member.

Preferably, both the first heat insulating member and the second heat insulating member are formed in a multilayer structure.

Preferably, the main heating member and the protective heating member include the following structures: a heat conduction part for releasing heat to the outside and formed of a metal material;

The heat conducting parts of the main heating member are evenly distributed in the main heating member;

The thermally conductive portions of the protective heating member are uniformly distributed within the protective heating member.

Preferably, the power output mechanism is driven by electrical energy, and the power output mechanism is powered in a feedback adjustment manner, so that the power output mechanism outputs constant power;

The power output mechanism is also powered with predetermined noise and predetermined ripple, so that the uncertainty of data acquisition by the data acquisition mechanism is less than or equal to 3%.

Preferably, the heating mechanism can heat the conduction heat flow meter at a temperature greater than 500 degrees Celsius;

The heat flux density of the conduction heat flow meter can reach 10000 W/m ² .

The calibration device provided in this application adopts a single hot plate and an open cold side design, and uses the Riemann integration method for deviation correction, so that the calibration can be performed even when one surface of the conduction heat flow meter is non-planar. Therefore, Has good applicability.

In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the preferred embodiments are exemplified below, and are described in detail as follows in conjunction with the accompanying drawings.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present application more clearly, the following drawings will briefly introduce the drawings that need to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore do not It should be regarded as a limitation of the scope, and for those of ordinary skill in the art, other related drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 shows a schematic diagram of the calibration operation of the calibration device for the conduction heat flow meter.

Reference number:

1-Measured heat flow meter; 2-Main heating plate; 3-First insulation member; 4-Protection heater; 5-Second insulation member; 6a-First temperature sensor; 6b-Second temperature sensor; 7-Power Output mechanism; 8-Temperature control mechanism.

Detailed ways

The technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limitations on this application. Furthermore, the terms "first", "second", and "third" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood in specific situations.

In addition, the technical solutions between the various embodiments can be combined with each other, but must be based on the realization by those of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of such technical solutions does not exist. , is not within the scope of protection claimed in this application.

FIG. 1 shows a schematic diagram of the calibration operation of the calibration device for the conduction heat flow meter. Referring to FIG. 1 , the calibration device provided by the present application includes: a heat flow meter under test, a main heating plate, a first thermal insulation member, a protective heater, a second thermal insulation member, a first temperature sensor, a second temperature sensor, a power output mechanism, and a temperature Adjustment mechanism, and data acquisition mechanism not shown in the figure. The relationship and working principle of the above components will be described in detail below.

It should be noted in advance that in this embodiment, the above-mentioned heat flow meter 1 under test is formed as a conduction heat flow meter; the gap between the components shown in FIG. , the gap between the main heating plate 2 and the first heat insulating member 3, the gap between the first heat insulating member 3 and the protective heater 4, the gap between the second heat insulating member 5 and the protective heater 4) are all It is schematically shown in order to clearly show the positional relationship of each component, but in fact, a close contact is formed between each component. In addition, for the convenience of the following description, taking the orientation shown in FIG. 1 as an example, the upper surface of the measured heat flow meter 1 may be defined as the back surface, and the lower surface of the measured heat flow meter 1 may be defined as the front surface.

As mentioned in the above description, the front and back of the measured heat flow meter 1 face away from each other. Although the front and back are shown as planes in FIG. 1, in fact, the quilt surface of the measured heat flow meter 1 can also be It is not a plane, that is, when the front is a plane, the shape of the back of the measured heat flow meter 1 targeted by the calibration device is not specifically limited in this embodiment, which makes the calibration device in this embodiment have wider applicability.

In the embodiment, the back of the measured heat flow meter 1 is open (that is, the back is completely exposed to the external environment), and the upper surface of the main heating plate 2 is completely in close contact with the front of the measured heat flow meter 1 (that is, the main heating plate 2 The upper surface of the tester has the same area as the front side of the heat flow meter 1 under test), so as to rapidly heat the heat flow meter 1 under test. The thermal power output by the main heating plate 2 to the outside 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 described in the following. given.

The main heating plate 2 is formed with a heat conducting portion that releases heat to the outside for heating. The heat-conducting part can be formed of a metal material. As a preferred choice, it can be formed of red copper. Due to the high thermal conductivity of red copper, the temperature range during the calibration process and the heat flux density range during the calibration process can be effectively increased. Further, the heat conducting parts can be evenly distributed in the main heating plate 2, for example, the filamentous red copper is folded back and forth to form a distribution in the main heating plate 2, so as to ensure that the heat released by the upper surface of the main heating plate 2 is uniform, which is beneficial to Speed up the equilibration speed of the heat flow meter 1 under test.

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 the form of feedback adjustment, so as to ensure that the power output mechanism 7 outputs constant power, so as to speed up the balancing speed of the measured heat flow meter 1, It also facilitates the following data acquisition operations and calibration calculations. 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 in the data acquisition process. As a better choice, the following data acquisition mechanism The uncertainty of data acquisition is limited to be less than or equal to 3%. In this way, when the back of the measured heat flow meter 1 is open, the possibility of increasing the uncertainty of data acquisition can be minimized as much as possible to ensure that the calibration calculation is accurate. The results are reliable.

In an embodiment, a first heat insulating member 3 may be disposed under the main heating plate 2, and the first heat insulating member 3 may be formed into a multi-layer structure, and these multi-layer structures may be formed of various heat insulating materials respectively. As shown in FIG. 1 , 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 for accommodating the main heating plate 2 ), so as to cooperate with the first heat insulating The thermal insulation property of the component 3 reduces the heat lost by the main heating plate 2 via its side surface and the lower surface as much as possible, which is also beneficial to speed up the equilibration speed of the measured heat flow meter 1 .

Further, under the first heat insulating member 3, a protective heater 4 may also be provided, and the shape of the protective heater 4 may be similar to that of the first heat insulating member 3, that is, the protective heater 4 may also be formed to accommodate the first heat insulating member 3. Therefore, the other surfaces of the first heat insulating member 3 except the upper surface can be covered and heated by the protective heater 4 (in addition, the protective heating member also includes the above-mentioned heat conduction part, and the arrangement is also roughly the same as The above heat transfer parts are the same, the difference is that the inner part of the groove part that protects the heating member is also uniformly distributed with the heat transfer parts). The purpose of this setting is that when the main heating plate 2 provides a higher heating temperature, the lower surface and the 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 the main heating plate 2 to have a higher heating temperature. Heat loss from heating plate 2.

Therefore, when the temperature inside the groove of the protective heater 4 is the same as the temperature of the lower surface of the main heating plate 2, the heat loss is zero, which is also beneficial to effectively shorten the equilibration time and improve the calibration efficiency. The "zero heat loss" mentioned here is an ideal state. In fact, due to unavoidable instrument errors and possible assembly errors between heating equipment, the heat loss can only approach zero, so "heat loss" Approaching zero" can also be regarded as "zero heat loss".

The above heating method of the protection heater 4 can be realized by the following setting methods. In the embodiment, the first temperature sensor 6a may be disposed between the lower surface of the main heating plate 2 and the first heat insulating member 3, and transmit a first temperature signal to the temperature control mechanism 8, and the first temperature signal is the above-mentioned And the signal of the temperature of the lower surface of the main heating plate 2. The second temperature sensor 6b may be disposed between the first heat insulating member 3 and the protective heating member, and transmits a second temperature signal to the temperature control mechanism 8 , the second temperature signal being the temperature inside the groove of the protective heater 4 . The temperature control mechanism 8 may compare the first temperature signal and the second temperature signal to control the temperature of the protective heating member to be consistent with the temperature of the main heating member.

On the basis of the above arrangement, the lower side of the protective heater 4 is further provided with a second heat insulating member 5, and the second heat insulating member 5 also covers other surfaces of the protective heater 4 except the upper surface thereof to further reduce heat loss. In addition, the second heat insulating member 5 may adopt the same layer structure as the above-mentioned first heat insulating member 3 , which will not be repeated here.

In an embodiment, the calibration device further includes a data acquisition mechanism not shown in FIG. 1 . The data acquisition mechanism may be connected in communication with both the power output mechanism 7 and the measured heat flow meter 1 for data acquisition. That is, the data collection mechanism collects 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 features described above, when the electromotive force output by the measured heat flow meter 1 is stable within the standard range, it can be considered that the measured heat flow meter 1 has reached an equilibrium state. Collect the aforementioned data with frequency, calculate the heat flux density with constant power, and then correct the deviation by the method of Riemann integration to obtain the heat flux meter coefficient, and complete the calibration of the measured heat flux meter 1.

As a preferred choice, the heating mechanism in this embodiment can heat the conduction heat flow meter at a temperature greater than 500 degrees Celsius, and the heat flow density of the conduction heat flow meter can reach 10000W/m ² , which is particularly beneficial to improve Calibrated temperature range and heat flow range, thus increasing the applicability of the calibration device.

The calibration device provided in this embodiment adopts a single hot plate and an open cold side design, and uses the Riemann integration method for deviation correction, so that calibration can also be performed even when the back of the conduction heat flow meter is non-planar. Therefore, it has good applicability.

The above are only the preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Under the innovative conception of the present application, the equivalent structure transformation made by using the contents of the description and drawings of the present application, or directly/indirectly applied to other Relevant technical fields are all included within the protection scope of the present application.

Claims (10)

1. A calibration device for calibrating a conductive heat flow meter formed with first and second surfaces facing away from each other, the first surface being formed as a plane; the calibration device includes:

a power output mechanism for providing power to generate heat flow;

the data acquisition mechanism is in communication connection with the power output mechanism and the conduction type heat flow meter so as to acquire data;

characterized in that the calibration device comprises:

a heating mechanism provided on a 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 a second surface of the conduction heat flow meter is open;

the data acquisition mechanism can perform Riemann integral calculation on the acquired data.

2. The calibration device of claim 1, wherein the heating mechanism comprises a main heating assembly comprising:

a main heating member formed with third and fourth surfaces facing away from each other and a side surface extending between the third and fourth surfaces, the main heating member being electrically connected with the power output mechanism, the third surface and the first surface being completely attached to each other such that the main heating member heats the first surface;

and a first heat insulating member provided on a fourth surface side of the main heating member and covering an outside of the side surface, the first heat insulating member being formed of a heat insulating material.

3. Calibration device according to claim 2,

the heating mechanism further comprises a protection heating assembly, the protection heating assembly is arranged on one side, back to the main heating member, of the first heat insulation member and covers the other outer surfaces of the first heat insulation member except the surface close to the conduction type heat flow meter, and the protection heating assembly heats the first heat insulation member, so that the heat lost by the main heating member through the fourth surface and the side surface is zero.

4. The calibration device of claim 3, wherein the protective heating assembly comprises:

the protective heating component is arranged on one side of the first heat insulation component, which is opposite to the main heating component, and covers the rest outer surface of the first heat insulation component except the surface close to the conduction type heat flow meter;

and the second heat insulation member is arranged on one side of the protection heating member, which is opposite to the first heat insulation member, and covers the rest outer surface of the protection heating member except the surface close to the conduction heat flow meter.

5. The calibration device of claim 4, further comprising:

and the temperature control mechanism is electrically connected with the protection heating component and used for adjusting the temperature of the protection heating component so that the temperature of the protection heating component is consistent with that of the main heating component.

6. The calibration device of claim 5, further comprising:

a first temperature sensor disposed between the fourth surface and the first heat insulating member and transmitting a first temperature signal to the temperature control mechanism;

a second temperature sensor which is provided between the first heat insulating member and the protection heating member and transmits a second temperature signal to the temperature control mechanism;

the temperature control mechanism compares the first temperature signal with the second temperature signal to control the temperature of the protection heating member to be consistent with the temperature of the main heating member.

7. Calibration device according to claim 4,

the first heat insulating member and the second heat insulating member are each formed in a multilayer structure.

8. Calibration device according to claim 4,

the main heating member and the protection heating member include the following structures: a heat conduction portion for releasing heat to the outside and formed of a metal material;

the heat conducting parts of the main heating component are uniformly distributed in the main heating component;

the heat conducting portions of the protective heating member are uniformly distributed in the protective heating member.

9. Calibration device according to any one of claims 1 to 8,

the power output mechanism is driven by electric energy and is powered in a feedback regulation mode, so that the power output mechanism outputs constant power;

the power output mechanism is also powered with a predetermined noise and a predetermined ripple such that the uncertainty of the data acquisition mechanism with respect to the data acquisition is less than or equal to 3%.

10. Calibration device according to claim 9,

the heating mechanism is capable of heating the conductive heat flow meter at a temperature greater than 500 degrees celsius;

the heat flux density of the conduction heat flow meter can reach 10000W/m²。

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