Thermocouple calibrating furnace

Abstract

The utility model relates to a temperature measuring and testing technical field discloses a thermocouple calibration furnace, and the thermocouple calibration furnace is used for calibrating thermocouple, and the thermocouple calibration furnace includes heating box, protection subassembly and detection subassembly, and protection subassembly sets up at one side of heating box, and protection subassembly is provided with protection cavity, and protection cavity is used for placing the detection end of thermocouple, and detection subassembly includes tee pipe, reaction tank, liquid seal tank, first gas valve, second gas valve and check valve, and the gas inlet end of tee pipe communicates with protection cavity, and reaction tank and liquid seal tank are connected respectively in two gas outlet ends of tee pipe, and the inside of reaction tank is filled with the reaction liquid that can have color reaction with oxygen, and first gas valve is connected in series between reaction tank and tee pipe, and second gas valve is connected in series between liquid seal tank and tee pipe, and check valve is connected in reaction tank, and the utility model discloses through tee pipe and first gas valve, second gas valve cooperation, can quickly switch liquid seal exhaust and color development detection two kinds of gas path mode.

Description

Technical Field

[0001] This utility model relates to the field of temperature measurement and verification technology, and more specifically, to a thermocouple verification furnace. Background Technology

[0002] Thermocouple calibration furnaces are specialized calibration equipment in the field of temperature measurement. Their core function is to provide a stable and uniform high-temperature field. By comparing standard thermocouples with the thermocouple under test at the same temperature, the measurement accuracy of various thermocouples is verified. Under high-temperature calibration conditions, thermocouple wires made of easily oxidized materials such as tungsten and tantalum are extremely sensitive to high-temperature oxygen. The presence of oxygen in the furnace will cause their thermoelectric characteristics to deviate, and in severe cases, wire breakage and failure will occur directly. In addition, if the thermocouple is equipped with a protective tube made of easily oxidized materials such as tungsten, molybdenum, or tantalum, high-temperature oxygen will cause corrosion and damage to the protective tube, resulting in the loss of its protective function. Therefore, during the calibration process, an inert protective gas must be introduced into the calibration furnace to isolate oxygen and protect the thermocouple.

[0003] Existing thermocouple calibration furnaces cannot monitor the airtightness of the furnace in real time during the calibration process. If outside air seeps in, it cannot be detected and the furnace cannot be shut down in time, which can easily cause high-temperature oxidation damage to the thermocouples. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art or related technologies.

[0005] Therefore: The first aspect of this utility model proposes a thermocouple calibration furnace for calibrating thermocouples. The thermocouple calibration furnace includes a heating chamber, a protection component, and a detection component. The protection component is located on one side of the heating chamber and has a protection cavity for placing the detection end of the thermocouple. The detection component includes a three-way pipe, a reaction vessel, a liquid-sealed vessel, a first gas valve, a second gas valve, and a one-way valve. The inlet end of the three-way pipe is connected to the protection cavity. The reaction vessel and the liquid-sealed vessel are respectively connected to the two outlet ends of the three-way pipe. The interior of the reaction vessel is filled with a reaction liquid that can react with oxygen to produce a colorimetric reaction. The first gas valve is connected in series between the reaction vessel and the three-way pipe. The second gas valve is connected in series between the liquid-sealed vessel and the three-way pipe. The one-way valve is connected to the reaction vessel. When the second gas valve is open and the first gas valve is closed, the gas in the protection cavity is discharged through the liquid-sealed vessel. When the first gas valve is open and the second gas valve is closed, the gas in the protection cavity is discharged through the reaction vessel and the one-way valve.

[0006] This invention proposes a thermocouple calibration furnace. First, the connector is screwed into the mounting base, allowing the testing end of the thermocouple to extend into the protective cavity of the protective tube until the lower end face of the connector is against the upper end face of the protective tube, completing the axial positioning and sealing installation of the thermocouple. Then, the second gas valve is opened and the first gas valve is closed. Inert protective gas from the gas cylinder enters the protective cavity from the bottom of the protective tube through the inlet pipe, gradually filling the protective cavity from bottom to top and carrying the existing air upwards. After flowing through the outlet pipe into the three-way pipe, it flows into the liquid-sealed tank. The gas passes through the liquid in the liquid-sealed tank, forming continuous bubbles. The operator can visually confirm that the inert protective gas has successfully entered the protective cavity by observing the bubbling state. After continuous gas flow for a predetermined time, the air in the protective cavity is completely vented out. After deoxygenation and replacement are completed before calibration, the first gas valve is opened and the second gas valve is closed. The inert protective gas in the protective chamber flows into the reaction vessel through the three-way pipe and is discharged through the one-way valve. After the gas path is stable, the heating box is started. During the calibration process, the reaction liquid in the reaction vessel is in continuous contact with the discharged gas in the protective chamber. If the airtightness of the protective chamber fails and outside air seeps into the protective chamber, the oxygen content in the discharged gas will increase. The reaction liquid will undergo a color change after contacting oxygen. The operator can immediately stop the operation of the heating box to avoid high-temperature oxidation of the thermocouple in the oxygen-containing environment. The pressure sensor connected in series in the gas path detects the gas path pressure in real time. The remaining amount of inert protective gas in the gas cylinder can be determined by the pressure value change, which facilitates timely replacement of the gas cylinder.

[0007] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0008] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure of one embodiment of the present utility model; Figure 2 This is a cross-sectional structural diagram of one embodiment of the present invention; Figure 3 This is a schematic diagram of the protective tube structure in one embodiment of the present invention; Figure 4 This is a schematic diagram of the cross-sectional structure of the protective tube in one embodiment of the present invention; Figure 5 This is a schematic diagram of the detection component structure in one embodiment of the present invention.

[0009] in, Figures 1 to 5 The correspondence between the reference numerals and component names in the attached drawings is as follows: 100 heating box; 200 protection components, 210 protection tube, 220 exhaust pipe, 230 intake pipe, 240 gas cylinder, 250 pressure sensor; 300 Detection component, 310 T-connector, 320 Reaction vessel, 330 Liquid seal vessel, 340 First gas valve, 350 Second gas valve, 360 Check valve, 370 Support plate, 380 Gas outlet; 400 Fixing component, 410 Mounting base, 420 Support rod, 430 Connector, 440 Thermocouple. Detailed Implementation

[0010] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0011] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0012] Please see Figures 1 to 5 A thermocouple calibration furnace is provided for calibrating thermocouples 440. The furnace includes a heating chamber 100, a protection component 200, and a detection component 300. The protection component 200 is located on one side of the heating chamber 100 and has a protective cavity for housing the detection end of the thermocouple 440. The detection component 300 includes a three-way pipe 310, a reaction vessel 320, a liquid-sealed vessel 330, a first gas valve 340, a second gas valve 350, and a one-way valve 360. The inlet end of the three-way pipe 310 is connected to the protective cavity. The reaction vessel 320 and the liquid-sealed vessel 330 are respectively connected to… The reaction vessel 320 is filled with a reaction liquid that can react with oxygen to produce a color change, connected to two gas outlets of the three-way pipe 310. A first gas valve 340 is connected in series between the reaction vessel 320 and the three-way pipe 310. A second gas valve 350 is connected in series between the liquid-sealed tank 330 and the three-way pipe 310. A one-way valve 360 ​​is connected to the reaction vessel 320. When the second gas valve 350 is open and the first gas valve 340 is closed, the gas in the protective chamber is discharged through the liquid-sealed tank 330. When the first gas valve 340 is open and the second gas valve 350 is closed, the gas in the protective chamber is discharged through the reaction vessel 320 and the one-way valve 360.

[0013] In this embodiment: The protection component 200 is located on one side of the heating chamber 100. The protection component 200 has a protective cavity for placing the detection end of the thermocouple 440. The protection component 200 provides an inert atmosphere space for the thermocouple 440, isolating it from the outside air and preventing high-temperature oxidation.

[0014] The inlet end of the three-way pipe 310 is connected to the protective cavity; the three-way pipe 310 divides the gas discharged from the protective cavity into two branches.

[0015] The reaction vessel 320 and the liquid seal vessel 330 are respectively connected to the two gas outlets of the three-way pipe 310. The interior of the reaction vessel 320 is filled with a reaction liquid that can react with oxygen to produce a color change. The reaction liquid filled inside the reaction vessel 320 can react with oxygen to produce a specific color change. The color change can be used to visually reflect the oxygen content in the exhaust gas and determine whether air leakage has occurred in the protective chamber.

[0016] The first gas valve 340 is connected in series between the reaction vessel 320 and the three-way pipe 310; the first gas valve 340 is used to control the on / off of the branch of the reaction vessel 320.

[0017] The second air valve 350 is connected in series between the liquid seal tank 330 and the three-way pipe 310; the second air valve 350 is used to control the on / off of the branch of the liquid seal tank 330.

[0018] One-way valve 360 ​​is connected to reaction vessel 320; one-way valve 360 ​​only allows gas to be discharged outside reaction vessel 320, and prevents external gas from flowing back into reaction vessel 320.

[0019] When the second air valve 350 is open and the first air valve 340 is closed, the gas in the protective chamber is discharged through the liquid seal tank 330.

[0020] When the first gas valve 340 is open and the second gas valve 350 is closed, the gas in the protective chamber is discharged through the reaction vessel 320 and the one-way valve 360.

[0021] Please see Figure 1 In some embodiments of this utility model, the protection component 200 includes a protection tube 210, an outlet pipe 220, an inlet pipe 230, a gas cylinder 240, and a pressure sensor 250. The protection tube 210 is partially disposed inside the heating box 100, and a protection cavity is provided inside the protection tube 210. The outlet pipe 220 is connected to the upper part of the outer wall of the protection tube 210, and one end of the outlet pipe 220 is connected to the protection cavity, and the other end is connected to the tee pipe 310. The inlet pipe 230 is connected to the lower part of the outer wall of the protection tube 210, and the inlet pipe 230 is connected to the protection cavity. The gas cylinder 240 is connected to the end of the inlet pipe 230 away from the protection tube 210, and the gas cylinder 240 is filled with inert protective gas. The pressure sensor 250 is connected in series between the gas cylinder 240 and the inlet pipe 230 for detecting the gas pressure.

[0022] In this embodiment: The protective tube 210 is partially located inside the heating chamber 100, and a protective cavity is provided inside the protective tube 210; the protective tube 210 is made of high temperature resistant material, and its lower end extends into the internal heating zone of the heating chamber 100.

[0023] The vent pipe 220 is connected to the upper part of the outer wall of the protective pipe 210, and one end of the vent pipe 220 is connected to the protective cavity, and the other end is connected to the three-way pipe 310; the vent pipe 220 is used to discharge the replaced air and excess inert protective gas.

[0024] The intake pipe 230 is connected to the lower outer wall of the protective pipe 210 and is connected to the protective cavity; the inert protective gas enters the protective cavity from the bottom of the protective pipe 210 and gradually displaces the air from bottom to top, thereby improving the fullness of air replacement.

[0025] The gas cylinder 240 is connected to the end of the air inlet pipe 230 away from the protective pipe 210, and the inside of the gas cylinder 240 is filled with inert protective gas; the gas cylinder 240 is a high-pressure gas storage container used to store inert protective gas.

[0026] Pressure sensor 250 is connected in series between gas cylinder 240 and air inlet pipe 230 to detect gas pressure. Pressure sensor 250 collects gas pressure values ​​in real time. The remaining amount of protective gas can be determined by the pressure value, and gas cylinder 240 can be replaced in advance to prevent gas supply interruption.

[0027] Please see Figure 1 In some embodiments of this utility model, the inert protective gas is argon.

[0028] In this embodiment: The inert protective gas is argon; argon is chemically extremely stable and does not react with the metal material of thermocouple 440 at high temperatures, ensuring high protection reliability.

[0029] Please see Figure 5 In some embodiments of this utility model, the upper end face of the liquid seal tank 330 is provided with an air outlet 380, and the detection component 300 further includes a support plate 370, which is fixed to the outer wall of the heating box 100, and the upper end of the support plate 370 is fixed with the reaction tank 320 and the liquid seal tank 330.

[0030] In this embodiment: The upper end face of the liquid seal tank 330 is provided with a vent 380; the vent 380 is the exhaust channel of the liquid seal tank 330. The gas discharged from the protective cavity is discharged to the external environment through the vent 380 after being bubbled by the liquid.

[0031] The support plate 370 is fixed to the outer wall of the heating box 100, and the upper end of the support plate 370 is fixed with the reaction vessel 320 and the liquid seal vessel 330.

[0032] Please see Figure 4In some embodiments of this utility model, the thermocouple calibration furnace further includes a fixing component 400. The fixing component 400 includes a mounting base 410, a plurality of support rods 420, and a connector 430. The mounting base 410 is fixed to the outer wall of the protective tube 210. The plurality of support rods 420 are fixed to the mounting base 410, and one end of the plurality of support rods 420 away from the mounting base 410 extends into the interior of the heating chamber 100 to support the mounting base 410. The connector 430 is threaded to the inner side of the mounting base 410, and the lower end face of the connector 430 is in contact with the upper end face of the protective tube 210. Thermocouple 440 is mounted on the connector 430, and the detection end of the thermocouple 440 extends into the protective cavity.

[0033] In this embodiment: Mounting base 410 is fixed to the outer wall of protective tube 210; mounting base 410 provides a reference interface for the installation of thermocouple 440.

[0034] Several support rods 420 are fixed to the mounting base 410, and one end of the several support rods 420 away from the mounting base 410 extends into the interior of the heating box 100 to support the mounting base 410.

[0035] The connector 430 is threaded to the inside of the mounting base 410, and the lower end face of the connector 430 is in contact with the upper end face of the protective tube 210. The connector 430 is screwed into the mounting base 410 through thread engagement, which facilitates the disassembly and installation of the thermocouple 440. After the connector 430 is tightened, the lower end face is in contact with the upper end face of the protective tube 210, which can help improve the sealing of the upper end of the protective cavity.

[0036] Thermocouple 440 is installed on connector 430, and the sensing end of thermocouple 440 extends into the protective cavity. Thermocouple 440 is installed through connector 430.

[0037] Please see Figure 4 In some embodiments of this utility model, the mounting base 410 and the protective tube 210 are welded and fixed together.

[0038] In this embodiment: Mounting base 410 is welded and fixed to protective tube 210.

[0039] Please see Figure 1 In some embodiments of this utility model, the liquid seal tank 330 is filled with liquid, and one outlet end of the three-way pipe 310 extends into the liquid.

[0040] In this embodiment: The liquid seal tank 330 is filled with liquid, and one of the outlet ends of the three-way pipe 310 extends into the liquid. The liquid seal tank 330 is filled with liquid for venting and liquid sealing during the ventilation stage. It can visually display the ventilation status through bubbling and prevent outside air from seeping back into the protective cavity.

[0041] In the claims, description, and accompanying drawings of this utility model, the term "plural" refers to two or more objects. Unless otherwise explicitly defined, the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description process, and are not intended to indicate or imply that the device or element referred to must have the described specific orientation, or be constructed and operated in a specific orientation. Therefore, these descriptions should not be construed as limitations on this utility model. The terms "connect," "install," "fix," etc., should be interpreted broadly. For example, "connect" can be a fixed connection between multiple objects, a detachable connection between multiple objects, or an integral connection; it can be a direct connection between multiple objects or an indirect connection between multiple objects through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood based on the specific circumstances described above.

[0042] In the claims, description, and drawings of this utility model, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In the claims, description, and drawings of this utility model, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0043] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A thermocouple calibration furnace, characterized in that, The thermocouple calibration furnace is used to calibrate thermocouples (440), and the thermocouple calibration furnace includes: Heating box (100); A protection component (200) is disposed on one side of the heating box (100). The protection component (200) is provided with a protective cavity for placing the detection end of the thermocouple (440). The detection assembly (300) includes a three-way pipe (310), a reaction vessel (320), a liquid seal vessel (330), a first gas valve (340), a second gas valve (350), and a one-way valve (360). The air inlet end of the three-way pipe (310) is connected to the protective cavity; The reaction vessel (320) and the liquid seal vessel (330) are respectively connected to the two gas outlets of the three-way pipe (310). The interior of the reaction vessel (320) is filled with a reaction liquid that can react with oxygen to produce a color reaction. The first gas valve (340) is connected in series between the reaction vessel (320) and the three-way pipe (310); The second gas valve (350) is connected in series between the liquid seal tank (330) and the three-way pipe (310); The one-way valve (360) is connected to the reaction vessel (320); When the second air valve (350) is open and the first air valve (340) is closed, the gas in the protective chamber is discharged through the liquid seal tank (330). When the first gas valve (340) is open and the second gas valve (350) is closed, the gas in the protective chamber is discharged through the reaction vessel (320) and the one-way valve (360).

2. The thermocouple calibration furnace according to claim 1, characterized in that, The protection component (200) includes: A protective tube (210) is partially disposed inside the heating box (100), and the protective tube (210) has a protective cavity inside; An exhaust pipe (220) is connected to the upper outer wall of the protective pipe (210), with one end of the exhaust pipe (220) connected to the protective cavity and the other end connected to the three-way pipe (310). An air intake pipe (230) is connected to the lower outer wall of the protective pipe (210) and is connected to the protective cavity; A gas cylinder (240) is connected to the end of the air inlet pipe (230) away from the protective pipe (210), and the gas cylinder (240) is filled with inert protective gas. A pressure sensor (250) is connected in series between the gas cylinder (240) and the air inlet pipe (230) to detect the gas pressure.

3. The thermocouple calibration furnace according to claim 2, characterized in that, The inert protective gas is argon.

4. The thermocouple calibration furnace according to claim 1, characterized in that, The liquid seal tank (330) has an air vent (380) on its upper end face, and the detection assembly (300) further includes: A support plate (370) is fixed to the outer wall of the heating box (100), and the upper end of the support plate (370) is fixed with the reaction vessel (320) and the liquid seal vessel (330).

5. The thermocouple calibration furnace according to claim 2, characterized in that, The thermocouple calibration furnace also includes a fixing assembly (400), which includes: Mounting base (410), the mounting base (410) is fixed to the outer wall of the protective tube (210); A plurality of support rods (420) are fixed to the mounting base (410), and one end of the plurality of support rods (420) away from the mounting base (410) extends into the interior of the heating box (100) to support the mounting base (410). A connector (430) is threaded to the inner side of the mounting base (410), and the lower end face of the connector (430) is attached to the upper end face of the protective tube (210). The thermocouple (440) is mounted on the connector (430), and the detection end of the thermocouple (440) extends into the protective cavity.

6. The thermocouple calibration furnace according to claim 5, characterized in that, The mounting base (410) is welded and fixed to the protective tube (210).

7. The thermocouple calibration furnace according to claim 1, characterized in that, The liquid-sealed tank (330) is filled with liquid, and one of the outlet ends of the three-way pipe (310) extends into the liquid.

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