CN212030779U - Anti-creeping wide-temperature-field thermocouple verification furnace - Google Patents

Abstract

The utility model belongs to the technical field of thermocouple verification furnace technique and specifically relates to a wide temperature field thermocouple verification furnace of anticreep, including being located heat preservation, rigid coupling in the shell heat preservation intraformational heater wire pipe and cup jointing the inner tube in the heater wire pipe, the heater wire pipe is sealed in the heat preservation, is equipped with the insulating gas layer between inner tube and the heater wire pipe. The use of the device can not only prevent electric leakage and induced electricity through the air insulation heating wire tube and the inner tube, but also prevent the electric leakage, the induced electricity, the contact electricity and the like at the high temperature of 1200 ℃ compared with the insulation by using a tubular anti-electric leakage coil.

Description

Anti-creeping wide-temperature-field thermocouple verification furnace

Technical Field

The utility model belongs to the technical field of the thermocouple examination stove, specifically speaking is a wide temperature field thermocouple examination stove of anticreep.

Background

At present, the verification of the thermocouple is mainly completed in a thermocouple verification furnace. The thermocouple calibration furnace is an electric heating device for providing a heat source for a thermocouple, and mainly comprises a hearth heating element, a heat-insulating layer shell and the like.

As JJF 1637 and 2017 cheap metal thermocouple calibration specifications are issued in 2017, when the thermocouple verification furnace is required to calibrate the cheap metal thermocouple, a temperature equalizing block needs to be added to improve the temperature field uniform interval of the thermocouple verification furnace. Because the temperature equalizing block is made of metal, the temperature equalizing block has the characteristic of electric conduction. In the conventional thermocouple verification furnace, the heating wire tube is the inner tube, so that the electric leakage phenomenon occurs at high temperature. The original thermocouple verification or calibration method is to place the thermocouple in the center of a verification furnace, and the actual situation may be where the thermocouple contacts with the tube wall, generally a contact point, the contact area is small, but the thermocouple may leak electricity or even trip at high temperature. After the temperature equalizing block is added, the contact area of the temperature equalizing block and the pipe wall is a plane, and the correspondingly formed step voltage is larger, so that the leakage tripping is easier. Inconvenience the actual thermocouple verification or calibration, or even failure to perform verification or calibration at certain temperatures.

To solve this problem, the application numbers are: chinese patent CN200620046770 provides an "anti-creeping, anti-creeping wide temperature field thermocouple verification furnace", which prevents a heating tube from creeping to an inner tube by arranging an inner tube for conducting heat in an existing thermocouple verification furnace and winding a tubular anti-creeping coil on the inner tube, thereby preventing the device from creeping. Although the electric leakage problem is solved in the use of the device, the increase of the device cost is caused, and meanwhile, when the device is used for a long time, the tubular anti-electric leakage coil is easily damaged at a high temperature for a long time, so that the insulation performance is deteriorated, and further the electric leakage phenomenon is easily caused to continue to exist in the thermocouple verification furnace.

SUMMERY OF THE UTILITY MODEL

The utility model provides a wide temperature field thermocouple examination stove of anticreep for solve the defect among the prior art.

The utility model discloses a following technical scheme realizes:

an anti-creeping wide-temperature-field thermocouple verification furnace comprises a heating wire pipe fixedly connected in a heat preservation layer and an inner pipe sleeved in the heating wire pipe, wherein an insulating gas layer is arranged between the inner pipe and the heating wire pipe.

This device is when using, because separate between inner tube and the heating wire pipe has the insulating gas layer, insulating gas has insulating effect, consequently can effectually prevent that the heating wire pipe is electrically conductive to the inner tube on, the use of this device can not only pass through air insulation heating wire pipe and inner tube, prevents electric leakage, faradic electricity, compare with the insulation that uses the anti electric leakage coil of tubulose to go on, this mode can be at the high temperature of 1200 ℃ circumstances such as anticreep, faradic electricity, contact electricity, reduce cost simultaneously.

Preferably, the inner pipe is sleeved in the heating wire pipe through an insulating supporting gasket, and an insulating gas layer is formed among the inner pipe, the insulating supporting gasket and the heating wire pipe. The inner pipe is suspended in the heating wire pipe through the support of the insulating support gasket, so that an insulating gas layer is formed among the heating wire pipe, the inner pipe and the insulating support gasket.

Preferably, the inner tube cup joint in insulating supporting pad, insulating supporting pad cup joints in the heater strip, consequently, can not only prevent that the inner tube from rocking in the heater strip, can guarantee to have the insulating gas layer simultaneously between inner tube and the silk pipe, prevent that external gas from getting into the insulating gas layer and arousing that heater strip and inner tube are electrically conductive.

Preferably, the insulating support gaskets are positioned at the two side ends of the heating wire tube. Therefore, the insulating support gasket can better support the inner pipe and prevent the inner pipe from contacting with the heating wire pipe.

Preferably, one side of each of the two insulating support gaskets, which is opposite to the other side, is provided with a limiting plug, and the limiting plugs are fixedly connected with the insulating support gaskets. The position of the insulating support gasket can be limited by the limiting plug, so that the position of the insulating support gasket is limited to achieve the effect of limiting the position of the inner pipe in the heating wire pipe, and the inner pipe is convenient to install.

Preferably, the limiting plug and the insulating support gasket form a trapezoidal shaft structure, the cylindrical surface of the limiting plug is in contact fit with the inner wall of the heat insulation layer, the inner end surface of the limiting plug is in contact with the end surface of the corresponding side of the heating wire tube, and the outer end surface of the limiting plug is positioned on the outer side of the verification furnace shell. The contact between the cylindrical surface of the limiting plug and the inner wall of the heat preservation layer can limit the limiting plug to play a role of limiting the inner pipe through the inner wall of the heat preservation layer, the contact between the inner end surface of the limiting plug and the corresponding end surface of the heating wire pipe can guarantee the transverse distance that the limiting plug extends into the heat preservation layer, and the outer end surface of the limiting plug is positioned outside the outer shell of the verification furnace so as to be convenient for taking out and mounting the limiting plug.

Preferably, the thickness of the annular wall of the insulating support gasket is 0.5mm-2 mm. And a gap with certain thickness is ensured between the heating wire tube and the inner tube.

Preferably, the insulating gas layer is an air layer.

The utility model has the advantages that: the use of this device, can not only have the insulating gas layer through the interval between insulating support gasket with heater tube and the inner tube, thereby make heater tube and inner tube pass through the air and keep apart, prevent that the heater tube from conducting the electric current to the inner tube on, and then prevent the thermocouple magnitude transmission error because of the electric leakage causes, damage high accuracy electricity measuring instrument even, compare simultaneously with prevent through the anti electric leakage coil of tubulose heating pipe electric leakage to the inner tube on, the cost is lower, the inner tube electric leakage that leads to because of the damage of the anti electric leakage coil of tubulose can not appear simultaneously.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a schematic structural diagram of the present invention.

Shown in the figure:

1. the heat preservation layer 2, the heating wire pipe 3, the inner pipe 4, the insulating support gasket 5, the insulating gas layer 6 and the limiting plug.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

An anti-creeping wide-temperature-field thermocouple verification furnace is shown in figure 1. The heat insulation structure comprises a heating wire pipe 2 and an inner pipe 3 which are coaxial and are sleeved together from outside to inside, wherein the heating wire pipe 2 is positioned in a heat insulation layer, the heat insulation layer 1 is made of heat insulation cotton and is fixedly connected in a shell, the heating wire pipe 2 and the inner pipe 3 are both made of corundum pipes, two ends of the inner pipe 3 are both provided with insulating support gaskets 4, each insulating support gasket comprises a support block structure, when the support block structure is adopted, one side surface of each support block structure is fixedly connected with the inner wall of the heating wire pipe 2, and the other side surface of each support block structure is fixedly connected with the cylindrical surface of the; the insulating support gasket 4 further comprises a tubular structure, and the section of the tubular structure perpendicular to the axial line is annular, wherein the insulating support gasket 4 is the optimal scheme and is described by adopting the scheme;

when the insulating support gasket 4 is a tubular structure, the insulating support gasket 4 is distributed at two sides of the heating wire tube 2, the insulating support gasket 4 penetrates into the heating wire tube 2, the cylindrical surface of the insulating support gasket 4 is in contact fit with the inner wall of the heating wire tube 2, the inner tube 3 penetrates into the insulating support gasket 4, the cylindrical surface of the inner tube 3 is in contact fit with the inner wall of the insulating support gasket 4, so that an insulating gas layer 5 is isolated between the heating wire tube 2 and the inner tube 3 through the insulating support gasket 4, further the heating wire tube 2 is prevented from conducting electricity to the inner tube 3, meanwhile, compared with the method of preventing the electric leakage of the heating wire tube 2 to the inner tube 3 by using a tubular anti-leakage coil, the method can prevent the electric leakage and the induced electricity through the air insulating heating wire tube 2 and the inner tube 3, compared with the insulation performed by using the tubular anti-leakage coil, the method can perform the electric leakage, the induced electricity, and the cost can be reduced.

In addition, two insulating support gasket 4 back of the body fixedly connected with spacing end cap 6, spacing end cap 6 and the insulating support gasket 4 fixed connection who corresponds the side just be the step axis structure, and wherein, the cooperation of the contact of the 6 face of cylinder of spacing end cap and 1 inner wall of heat preservation can inject spacing end cap through heat preservation 1 to inject the position of inserting inner tube 3 in insulating support gasket 4. Meanwhile, the limiting plug 6 and the insulating support gasket 4 are of an integrated structure, and the limiting plug 6 and the insulating support gasket 4 can be conveniently processed in a unified mode.

The side surface of the inner end of the limiting plug 6 is in contact with the corresponding side end surface of the heating wire tube 2, and the depth of the limiting plug inserted into the heat-insulating layer 1 can be limited. The side face of the outer end of the limiting plug 6 penetrates out of the shell, so that the limiting plug 6 can be conveniently taken out and inserted.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims (8)

1. The anti-creeping wide-temperature-field thermocouple verification furnace is characterized by comprising a heating wire tube (2) fixedly connected in a heat-insulating layer (1) and an inner tube (3) sleeved in the heating wire tube (2), wherein an insulating gas layer (5) is arranged between the inner tube (3) and the heating wire tube (2).

2. The wide temperature field thermocouple calibration furnace according to claim 1, wherein: the inner pipe (3) is sleeved in the heating wire pipe (2) through an insulating support gasket (4), and an insulating gas layer (5) is formed among the inner pipe (3), the insulating support gasket (4) and the heating wire pipe (2).

3. The wide temperature field thermocouple calibration furnace according to claim 2, wherein: the inner pipe (3) is sleeved in the insulating support gasket (4), and the insulating support gasket (4) is sleeved in the heating wire pipe (2).

4. The wide temperature field thermocouple calibration furnace according to claim 3, wherein: the insulating support gaskets (4) are positioned at two ends of the heating wire tube (2).

5. The wide temperature field thermocouple calibration furnace according to claim 4, wherein: one side of the two insulating support gaskets (4) opposite to each other is provided with a limiting plug (6), and the limiting plug (6) is fixedly connected with the insulating support gaskets (4).

6. The wide temperature field thermocouple calibration furnace according to claim 5, wherein: the limiting plug (6) and the insulating support gasket (4) form a trapezoid shaft structure, the cylindrical surface of the limiting plug (6) is in contact fit with the inner wall of the heat preservation layer (1), the inner end face of the limiting plug (6) is in contact with the end face of the corresponding side of the heating wire tube (2), and the outer end face of the limiting plug (6) is located on the outer side of the shell of the verification furnace.

7. The wide temperature field thermocouple calibration furnace according to claim 1 or 2, wherein: the thickness of the insulating gas layer (5) ranges from 0.5mm to 2 mm.

8. The wide temperature field thermocouple calibration furnace according to claim 1 or 2, wherein: the insulating gas layer (5) is an air layer.

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