CN215952822U

CN215952822U - Armored thermocouple calibration heat shield for furnace

Info

Publication number: CN215952822U
Application number: CN202122493821.1U
Authority: CN
Inventors: 刘波; 马超
Original assignee: Shanghai Institute of Measurement and Testing Technology
Current assignee: Shanghai Institute of Measurement and Testing Technology
Priority date: 2021-10-15
Filing date: 2021-10-15
Publication date: 2022-03-04
Anticipated expiration: 2031-10-15

Abstract

The utility model relates to the technical field of armored thermocouple calibration, and discloses a heat shield for an armored thermocouple calibration furnace, which comprises a calibration furnace, wherein a furnace tube is arranged in the calibration furnace, a temperature equalizing block is arranged at the center of the furnace tube, an even bundle is inserted in the temperature equalizing block, a heat shield is arranged at a furnace opening of the calibration furnace, the heat shield consists of two shells movably connected through a hinge, a water inlet pipe and a water outlet pipe are arranged on the outer walls of the two shells, baffle plates are arranged in the two shells, and inner holes are formed in the opposite sides of the two shells; can let in coolant through the inlet tube, the coolant who lets in is discharged from the outlet pipe after baffling by the baffling board, and at the in-process that coolant flows, coolant can reduce the heat-conduction and the thermal convection of even bundle to reduce the temperature rise of even bundle cold junction, simultaneously, thermal-insulated cotton also can block the heat radiation, further reduction even temperature rise of restrainting the cold junction.

Description

Armored thermocouple calibration heat shield for furnace

Technical Field

The utility model relates to the technical field of armored thermocouple calibration, in particular to a heat shield for an armored thermocouple calibration furnace.

Background

The sheathed thermocouple is a thermocouple which is made of sheathed thermocouple cables which are encapsulated by insulated inorganic substances and metal sleeves for thermocouple wires and is suitable for temperature measurement in various industrial processes. The cold end of the armored thermocouple is usually made of stainless steel material, and needs to be filled with insulating glue when connecting the compensation lead and the thermocouple.

When the armored thermocouple is calibrated in a temperature range of more than 300 ℃, a standard thermocouple and a calibrated armored thermocouple need to be inserted into a temperature equalizing field in the center of the calibration furnace. When the calibration temperature is high, such as over 500 ℃, and the length of the calibrated armored thermocouple is short, such as shorter than 20cm, the cold end of the armored thermocouple is influenced by the heat transfer of the calibration furnace and is in a high temperature state. The insulation paste in the cold end softens and deforms at higher temperatures and even burns into powder, resulting in reduced insulation performance or product damage.

In order to reduce the temperature of the cold end of the armored thermocouple to be calibrated, the utility model patent application published in China adopts a forced convection heat transfer system (application number: 201711173895.9), so that the outlet of the air equalizer directly blows the thermocouple to be measured, and the temperature of the sensor sealant is reduced. The mode of directly blowing the thermocouple to be measured needs to seal the thermocouple to be measured and the calibration furnace so as to avoid asbestos fibers for heat preservation from floating in the air and polluting the environment of a laboratory.

In another invention patent application published in China, namely 'liquid rocket engine short thermocouple steady-state calibration device' (application number: 201710692159.8), in order to reduce heat conduction errors, the utility model discloses the calibration device which comprises an air cooling system of a shortened thermocouple, wherein the air cooling system comprises a cooler pipeline, an air cooling mounting flange and a regulating valve mounted on the cooler mounting pipeline. The flange body is used as an installation support of the calibrated short thermocouple, and the calibrated short thermocouple is fixed on the test section. This device is not suitable for calibration laboratories with different types and sizes of thermocouples to be calibrated, and with varying numbers of thermocouples to be calibrated.

In the third-party calibration laboratory, in the face of different types of armored thermocouples, particularly short armored thermocouples with higher calibration temperature, measures need to be taken to reduce the temperature of the cold end of the short armored thermocouples so as to prevent insulating glue in the cold end from softening and carbonizing at high temperature, however, the existing technical scheme is not applicable, and based on the problem, a heat shield for the armored thermocouple calibration furnace is provided, and the defects in the prior art are hopefully solved.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

Aiming at the defects of the prior art, the utility model provides the heat shield for the armored thermocouple calibration furnace, which has the advantage of effectively reducing the temperature of the cold end of the armored thermocouple.

(II) technical scheme

In order to achieve the purpose of effectively reducing the temperature of the cold end of the armored thermocouple, the utility model provides the following technical scheme: the utility model provides an armoured thermocouple is heat shield for calibration furnace, includes the calibration furnace, the inside of calibration furnace is provided with the boiler tube, the center department of boiler tube is provided with the samming piece, the inside of samming piece is inserted and is equipped with the couple and restraints, the fire door department of calibration furnace is provided with heat shield, heat shield comprises two shells that link to each other through the hinge activity, two the outer wall of shell all is provided with inlet tube and outlet pipe, two the inside of shell all is provided with the baffling board, two one side that the shell is relative all is formed with the hole, the hole is passed to the end of couple restraint, it has thermal-insulated cotton to fill between couple restraint and the hole.

As a preferred technical scheme of the present invention, a temperature controller is fixedly installed on an outer wall of the calibration furnace, a temperature control thermocouple and an electric heating wire are arranged on the furnace tube, an output end of the temperature control thermocouple is electrically connected with an input end of the temperature controller, and an output end of the temperature controller is electrically connected with an input end of the electric heating wire.

As a preferred technical scheme of the utility model, the extension line of the even beam tail end is placed in a freezing point thermostat, and the freezing point thermostat is connected with an electric measuring device through a lead.

As a preferable technical scheme of the utility model, one sides of the two shells are movably connected through a hinge, and the other sides of the two shells are movably provided with calipers.

As a preferable technical scheme of the utility model, the heat insulation cotton is made of asbestos.

As a preferred technical scheme of the utility model, the two shells are rectangular, water inlet pipes are arranged at the bottoms of the two rectangular shells, and water outlet pipes are arranged at the opposite sides of the two rectangular shells.

As a preferred technical scheme of the utility model, two baffle plates are vertically arranged inside the two rectangular shells.

As a preferable technical scheme of the utility model, the two shells are semicircular, water inlet pipes are arranged on one sides of the two semicircular shells close to the hinge, and water outlet pipes are arranged on the opposite sides of the two water inlet pipes.

As a preferable technical scheme of the utility model, a baffle plate is vertically arranged in each of the two semicircular shells.

(III) advantageous effects

Compared with the prior art, the utility model provides a heat shield for an armored thermocouple calibration furnace, which has the following beneficial effects:

1. this armoured thermocouple calibration is heat shield for stove can let in cooling medium through the inlet tube, and the cooling medium who lets in is discharged from the outlet pipe after baffling by the baffling board, and at the in-process that cooling medium flows, cooling medium can reduce the heat-conduction and the thermal convection of even bundle to reduce the temperature rise of even bundle cold junction, simultaneously, thermal-insulated cotton also can block the heat radiation, further reduction even bundle cold junction's temperature rise.

2. The armored thermocouple calibration furnace heat shield adopts asbestos for heat insulation, and can adapt to the change of the number, the type and the size of armored thermocouples to be calibrated; the baffle plate is adopted for diversion, so that the heat transfer effect is improved, the temperature rise of the cold end of the armored thermocouple can be efficiently reduced, and the damage caused by overheating is avoided.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of a heat shield in accordance with an embodiment of the present invention;

FIG. 3 is a schematic view of a heat shield in another embodiment of the present invention.

In the figure: 1. calibrating the furnace; 2. a heat shield; 3. a furnace tube; 4. a temperature controller; 5. a temperature equalizing block; 6. even bundling; 7. a freezing point thermostat; 8. an electrical measurement device; 9. a housing; 10. a hinge; 11. a caliper; 12. a water inlet pipe; 13. a water outlet pipe; 14. a baffle plate; 15. heat insulation cotton; 16. an inner bore.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

The first embodiment is as follows:

referring to fig. 1 and 2, a heat shield for an armored thermocouple calibration furnace includes a calibration furnace 1, a furnace tube 3 is disposed inside the calibration furnace 1, a temperature controller 4 is fixedly mounted on an outer wall of the calibration furnace 1, a temperature control thermocouple and an electric heating wire are disposed on the furnace tube 3, an output end of the temperature control thermocouple is electrically connected with an input end of the temperature controller 4, an output end of the temperature controller 4 is electrically connected with an input end of the electric heating wire, and the temperature controller 4 adjusts an output of the temperature controller 4 according to a measured temperature of the temperature control thermocouple and a set temperature, so as to adjust an output power of the electric heating wire;

a temperature equalizing block 5 is arranged at the center of the furnace tube 3, an even bundle 6 is inserted into the temperature equalizing block 5 (one end of the even bundle 6 inserted into the temperature equalizing block 5 is a hot end), an extension line at the tail end of the even bundle 6 is placed in a freezing point thermostat 7, and the freezing point thermostat 7 is connected with an electrical measuring device 8 through a lead;

in the embodiment, a heat shield 2 is arranged at a furnace mouth of a calibration furnace 1, the heat shield 2 is composed of two shells 9 movably connected through a hinge 10, one sides of the two shells 9 are movably connected through the hinge 10, a caliper 11 is movably arranged at the other side of the two shells 9, the two shells 9 can be freely separated through the position of the hinge 10, and the two shells 9 can be mutually closed and locked through the arrangement of the caliper 11, so that the two shells 9 are connected into a whole;

inner holes 16 are formed in the opposite sides of the two shells 9, the tail end of the even bundle 6 penetrates through the inner holes 16, and asbestos heat insulation cotton 15 is filled between the even bundle 6 and the inner holes 16, so that the change of the number, the type and the size of the armored thermocouples to be calibrated can be adapted;

the outer walls of the two shells 9 are respectively provided with a water inlet pipe 12 and a water outlet pipe 13, the interiors of the two shells 9 are respectively provided with a baffle plate 14, a cooling medium can be introduced through the water inlet pipe 12, the introduced cooling medium is discharged from the water outlet pipe 13 after being baffled by the baffle plates 14, and the cooling medium can be water, air or heat conduction oil;

in this embodiment, as shown in fig. 2, the two housings 9 are rectangular, the bottom portions of the two rectangular housings 9 are provided with water inlet pipes 12, the opposite sides of the two rectangular housings 9 are provided with water outlet pipes 13, the interiors of the two rectangular housings 9 are vertically provided with two baffle plates 14, the arrangement manner of the four baffle plates 14 is shown in fig. 2, the two baffle plates 14 close to the inner hole 16 are fixed on the inner bottom wall of the housing 9, and the two baffle plates 14 far away from the inner hole 16 are fixed on the inner top wall of the housing 9, so that a cooling medium with a lower temperature enters the housing 9, flows through the inner hole 16 first, gradually absorbs heat, increases the temperature, gradually reduces the heat exchange capacity, and finally flows out of the housing 9 after being baffled;

in this embodiment, the calibration furnace 1 is a horizontal thermocouple calibration furnace, and a positioning support device, such as a support plate, is provided at the furnace mouth of the measurement end for mounting the heat shield 2.

Example two:

referring to fig. 3, on the basis of the first embodiment, the difference between the first embodiment and the second embodiment is that the two housings 9 are both semicircular, water inlet pipes 12 are disposed on the two semicircular housings 9 near the hinge 10, and water outlet pipes 13 are disposed on the two water inlet pipes 12 opposite to each other.

A baffle plate 14 is vertically arranged inside each of the two semicircular shells 9, as shown in fig. 3, and a total of two baffle plates 14 are fixedly arranged on the inner bottom wall of the shell 9, compared with the first embodiment, the second embodiment has the advantages that the number of baffle plates 14 is reduced, and the cost is saved.

The working principle and the using process of the utility model are as follows:

cooling medium can be introduced through the water inlet pipe 12, the introduced cooling medium is baffled by the baffle plate 14 and then discharged from the water outlet pipe 13, and in the flowing process of the cooling medium, the cooling medium can reduce heat conduction and heat convection of the even bundle 6, so that the temperature rise of the cold end of the even bundle 6 is reduced, and meanwhile, the heat insulation cotton 15 can also block heat radiation, so that the temperature rise of the cold end of the even bundle 6 is further reduced;

asbestos is adopted for heat insulation, so that the change of the number, the type and the size of the armored thermocouples to be calibrated can be adapted; the baffle plate 14 is adopted for flow guiding, so that the heat transfer effect is improved, the temperature rise of the cold end of the armored thermocouple can be efficiently reduced, and the damage caused by overheating is avoided.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an armoured thermocouple is heat shield for calibration furnace, includes calibration furnace (1), the inside of calibration furnace (1) is provided with boiler tube (3), the center department of boiler tube (3) is provided with samming piece (5), the inside of samming piece (5) is inserted and is equipped with even bundle (6), its characterized in that: the utility model discloses a calibration stove, including calibration stove (1), heat shield (2) are provided with in the fire door department of calibration stove (1), heat shield (2) comprise two shells (9) that link to each other through hinge (10) activity, two the outer wall of shell (9) all is provided with inlet tube (12) and outlet pipe (13), two the inside of shell (9) all is provided with baffling board (14), two one side that shell (9) is relative all is formed with hole (16), hole (16) are passed to the end of even bundle (6), it has thermal-insulated cotton (15) to fill between even bundle (6) and hole (16).

2. A thermal shield for an armored thermocouple calibration furnace as claimed in claim 1, wherein: the outer wall fixed mounting of calibration stove (1) has temperature controller (4), be provided with accuse temperature thermocouple and electric heating wire on boiler tube (3), the output of accuse temperature thermocouple and the input electric connection of temperature controller (4), the output of temperature controller (4) and electric heating wire's input electric connection.

3. A thermal shield for an armored thermocouple calibration furnace as claimed in claim 1, wherein: the extension line of the tail end of the even beam (6) is placed in the freezing point thermostat (7), and the freezing point thermostat (7) is connected with the electric measuring equipment (8) through a lead.

4. A thermal shield for an armored thermocouple calibration furnace as claimed in claim 1, wherein: one sides of the two shells (9) are movably connected through a hinge (10), and the other sides of the two shells (9) are movably provided with calipers (11).

5. A thermal shield for an armored thermocouple calibration furnace as claimed in claim 1, wherein: the heat insulation cotton (15) is made of asbestos.

6. A thermal shield for an armored thermocouple calibration furnace as claimed in claim 1, wherein: two casing (9) all are rectangle, and the bottom of two rectangle casings (9) all is provided with inlet tube (12), and one side that two rectangle casings (9) carried on the back mutually all is provided with outlet pipe (13).

7. The armored thermocouple calibration furnace heat shield of claim 6, wherein: two baffle plates (14) are vertically arranged inside the two rectangular shells (9).

8. A thermal shield for an armored thermocouple calibration furnace as claimed in claim 1, wherein: two casing (9) all are semicircular in shape, and one side that two semicircular casing (9) are close to hinge (10) all is provided with inlet tube (12), two one side that inlet tube (12) carried on the back mutually all is provided with outlet pipe (13).

9. The armored thermocouple calibration furnace heat shield of claim 8, wherein: a baffle plate (14) is vertically arranged in each of the two semicircular shells (9).