CN110763371A - A dry body furnace based on fixed point of heat pipe - Google Patents

Abstract

The present invention provides a dry body furnace based on a fixed point of a heat pipe, which comprises: a shell, the shell forms an accommodating space; a heat pipe, the heat pipe is located in the accommodating space of the shell; temperature block; the bottom wall and side wall of the heat pipe are hollow structures, and there is a through hole in the center of the bottom wall, a temperature field standard source and a verification temperature equalizing block are arranged in the inner space of the heat pipe, the temperature The on-site standard source is located on the inner surface of the bottom wall of the heat pipe, and the verification temperature equalization block is located above the temperature on-site standard source; at least one fixed point container is arranged in the temperature on-site standard source. The dry body furnace based on the fixed point of the heat pipe of the present invention has a simple structure and uniform temperature field distribution, and can combine the fixed point defined by the 90 international temperature scale and the recommended secondary fixed point. The dry body furnace is easy to perform on-site detection and has high temperature control accuracy.

Description

A dry body furnace based on fixed point of heat pipe

technical field

The invention relates to a dry body furnace, in particular to a dry body furnace based on fixed points of heat pipes.

Background technique

In the existing calibration process of thermometers, it is usually necessary to provide a constant temperature water tank to provide a constant temperature field for thermometer detection. However, the volume of the constant temperature water tank is relatively large, and it takes a long time to keep the temperature stable, which can only be used in the laboratory for thermometers Provides calibration use, but cannot be used for some occasions that require quick and convenient testing on site.

At present, for on-site verification, a dry furnace is usually used instead of a constant temperature water tank to provide a uniform temperature field. Compared with a constant temperature water tank, the dry furnace is easy to carry, and the temperature can rise quickly, forming a stable temperature distribution. , which is convenient for on-site verification and calibration. However, the temperature control accuracy of the existing dry body furnace is relatively low, the temperature field distribution is not uniform, and in the special environment of the site, the temperature measurement sensor or the standard device is prone to drift and other phenomena.

Therefore, it is an urgent problem to provide a dry body furnace with high temperature control accuracy.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a dry body furnace with self-calibration and high temperature control accuracy.

The present invention provides a heat-pipe-based dry furnace, comprising: an outer shell, the outer shell forms an accommodating space; a heat pipe, the heat pipe is located in the accommodating space of the outer shell; a temperature field standard source and a calibration temperature equalizing block ; The bottom wall and side wall of the heat pipe are hollow structures, and there is a through hole in the center of the bottom wall, and a temperature field standard source and a verification temperature equalizing block are arranged in the inner space of the heat pipe. The temperature field standard The source is located on the inner surface of the bottom wall of the heat pipe, and the verification temperature equalizing block is located above the temperature field standard source; the center of the temperature field standard source and the verification temperature equalizing block has a through hole.

Wherein, the casing includes a side wall and a bottom plate, the casing is a double-layer structure, the inner layer is a heat insulating material, and the outer layer is a stainless steel material.

Wherein, there are a plurality of mounting holes in the temperature field standard source.

Wherein, there are a plurality of installation holes in the calibration temperature equalizing block.

Wherein, a heating element is provided on the outer surface of the bottom wall of the heat pipe, and preferably the heating element is a heating film.

Wherein, the height of the verification temperature equalization block is greater than the height of the temperature field standard source.

Wherein, the temperature field standard source is used as a field self-calibration module to calibrate the inspected thermometer, the standard transfer thermometer and the temperature control thermometer by the fixed point method.

Wherein, the calibration temperature equalization block calibrates the thermometer to be inspected on site by a comparison method.

The dry body furnace based on the fixed point of the heat pipe of the present invention has a simple structure and uniform temperature field distribution, and can combine the fixed point defined by the 90 international temperature scale and the recommended secondary fixed point. The dry body furnace is easy to perform on-site detection, and has high temperature control accuracy.

Description of drawings

Fig. 1 is the structural representation of the dry body furnace of the present invention;

2 is a schematic bottom view of Embodiment 1 of the temperature field standard source of the present invention;

3 is a schematic bottom view of Embodiment 2 of the temperature field standard source of the present invention;

FIG. 4 is a schematic bottom view of Embodiment 3 of the temperature field standard source of the present invention.

Detailed ways

In order to facilitate the understanding of the present invention, the embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that the following descriptions are only for the convenience of explaining the present invention, and are not intended to specifically limit its scope.

The drying furnace of the present invention comprises an outer shell, the outer shell forms a accommodating space, the outer shell includes a side wall and a bottom plate, the outer shell is a double-layer structure, the inner layer is a heat insulating material, and the outer layer is a stainless steel material, so that the outer shell has both It has problems such as insulation and protection from damage caused by collisions.

FIG. 1 is a schematic diagram showing the structure of the dry body furnace in the shell. A heat pipe 1 is provided in the casing, the heat pipe 1 is located in the accommodating space of the casing 1 , and the casing supports the heat pipe 1 . The heat pipe 1 has a bottom wall and a side wall extending upward from the bottom wall. The bottom wall and the side wall of the heat pipe 1 are hollow structures. In this state, an appropriate amount of working medium is charged, heated at the lower end of the heat pipe, the working medium absorbs heat and vaporizes into steam, and rises to the upper end of the heat pipe under a small pressure difference, releases heat to the outside, and condenses into liquid. Under the action of gravity, the condensate returns to the heating section along the inner wall of the heat pipe, and is heated and vaporized again, and so on and so forth, continuously transferring heat from one end to the other. Due to the phase change heat transfer, the thermal resistance in the heat pipe is very small. The working medium is arranged in the hollow structure, and a through hole is formed in the center of the bottom wall. The through hole penetrates the bottom wall. The surrounding temperature distribution has an effect, ensuring temperature uniformity near the bottom wall. Preferably, a heating component can be provided on the outer surface of the bottom wall of the heat pipe 1, and the heating component is preferably a heating film. The temperature at the wall location is uniform and constant. When the bottom wall of the heat pipe is heated, the high thermal conductivity material absorbs heat and vaporizes into steam. Under a small pressure difference, it rises to the upper end of the heat pipe, releases heat to the outside, and condenses into a liquid. Under the action of gravity, the condensate returns to the heating section along the inner wall of the heat pipe, and is heated and vaporized again. This cycle repeats, continuously transferring heat from one end to the other end, so that the heat pipe has a uniform temperature field.

A temperature field standard source 2 and a calibration temperature equalizing block 3 are arranged in the inner space of the heat pipe 1 , the temperature field standard source 2 is located on the inner surface of the bottom wall of the heat pipe 1 , and the temperature field standard source 2 The bottom of the heat pipe is in contact with the inner surface of the bottom wall of the heat pipe 1 , and the calibration temperature equalization block 3 is located above the temperature field standard source 2 . The height of the verification temperature equalization block 3 is greater than the height of the temperature field standard source 2 . The heat pipe 1 provides a uniform temperature field in its inner space.

The center of the temperature field standard source 2 has a first through hole, and three installation holes are arranged around the first through hole, and the three installation holes are evenly distributed around the first through hole, as shown in FIG. 2 . It is a schematic diagram of the bottom surface of Embodiment 1 of the temperature field standard source. The three mounting holes are rotated by 120 degrees in sequence relative to the first through-hole, and are evenly distributed around the first and first through-holes. A fixed point is arranged in the installation hole, and the fixed point is used to provide temperature calibration. The fixed point of the three installation holes can be selected from the fixed point defined by the 90 international temperature scale and the recommended secondary fixed point material.

FIG. 3 is a schematic diagram of the bottom surface of Embodiment 2 of the temperature field standard source. Three annular grooves are distributed at equal intervals around the temperature field standard source 2, and a fixed point device for temperature calibration is set in the annular groove. , the same fixing point can be installed in each of the three annular grooves, or different fixing points can be installed to obtain multiple buildable temperatures.

As a further preference, FIG. 4 is a schematic diagram of the bottom surface of Embodiment 1 of the temperature field standard source. Six installation holes may be distributed at equal intervals around the temperature field standard source 2. For a calibrated fixed point device, the same fixed point can be installed in each of the six mounting holes, or different fixed points can be installed to obtain multiple buildable temperatures.

The center of the calibration block 3 has a second through hole, and a plurality of installation holes are arranged around the second through hole. The thermometer to be measured can be placed in the installation holes, and the standard platinum resistance thermometer 4 is inserted into the said installation hole. In the second through hole of the calibration block 3 , the standard platinum resistance thermometer measures the thermometer of the calibration block 3 . The calibration temperature equalization block calibrates the thermometer to be inspected on site by the comparison method. It is further preferred that the standard platinum resistance thermometer can penetrate down into the first through hole of the temperature field standard source 2, and the platinum resistance thermometer is calibrated through the fixed point in the verification temperature equalizing block 3, thereby realizing the calibration of the platinum resistance thermometer. The calibration of the thermometer to be measured in the installation hole of the temperature equalizing block 3 is verified.

A temperature measuring element is used to protrude from the through hole in the center of the bottom wall of the heat pipe 1 into the first through hole of the temperature field standard source 2, the temperature measuring element is connected to the temperature measuring instrument 5, and the fixed point is calibrated at the same time For the standard platinum resistance thermometer and temperature control detection element, preferably the temperature measurement element is a temperature control thermometer. As a further option, when performing on-site detection, the temperature of the temperature on-site standard source can be measured only by the temperature control detection element, and the calibration of the thermometer to be measured can be realized by real-time detection of the fixed point. For the fixed point, the fixed point defined by the 90 international temperature scale and the recommended secondary fixed point material can be selected. The temperature on-site standard source is used as on-site self-calibration module to calibrate the detected thermometer, the standard transfer thermometer and the temperature control thermometer by the fixed point method.

The dry body furnace based on the fixed point of the heat pipe of the present invention has a simple structure and uniform temperature field distribution, and can combine the fixed point defined by the 90 international temperature scale and the recommended secondary fixed point. The dry body furnace is easy to perform on-site detection, and has high temperature control accuracy. It should be understood that, although the present invention has been disclosed above with preferred embodiments, the above embodiments are not intended to limit the present invention. For any person skilled in the art, without departing from the scope of the technical solution of the present invention, many possible changes and modifications can be made to the technical solution of the present invention by using the technical content disclosed above, or modified into equivalents of equivalent changes Example. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solutions of the present invention still fall within the protection scope of the technical solutions of the present invention.

Claims (8)

1. A dry body oven based on heat pipe fixing points, comprising:

a housing forming an accommodation space;

the heat pipe is positioned in the accommodating space of the shell;

a temperature field standard source and a verification temperature equalizing block;

the method is characterized in that: the bottom wall and the side wall of the heat pipe are of hollow structures, a through hole is formed in the center of the bottom wall, a temperature field standard source and a verification temperature equalizing block are arranged in the inner space of the heat pipe, the temperature field standard source is located on the inner surface of the bottom wall of the heat pipe, and the verification temperature equalizing block is located above the temperature field standard source; the centers of the temperature field standard source and the verification temperature equalizing block are provided with through holes.

2. The dry body oven of claim 1, wherein: the shell comprises a side wall and a bottom plate, the shell is of a double-layer structure, the inner layer is made of heat insulation materials, and the outer layer is made of stainless steel materials.

3. The dry body oven of claim 1, wherein: there are a plurality of mounting holes in the field standard source of temperature.

4. The dry body oven of claim 1, wherein: the verification temperature equalizing block is provided with a plurality of mounting holes.

5. The dry body oven of claim 1, wherein: and a heating assembly is arranged on the outer surface of the bottom wall of the side wall of the heat pipe.

6. The dry body oven of claim 1, wherein: the height of the verification temperature equalizing block is larger than that of the temperature field standard source.

7. The dry body oven of claim 1, wherein: the temperature field standard source is used as a field self-calibration module, and the thermometer to be tested, the standard transfer thermometer and the temperature control thermometer are calibrated by a fixed point method.

8. The dry body oven of claim 1, wherein: and the verification temperature equalizing block calibrates the on-site thermometer to be detected by using a comparison method.

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