CN114414097A

CN114414097A - Thermometer calibration device

Info

Publication number: CN114414097A
Application number: CN202210085338.6A
Authority: CN
Inventors: 胡子峰; 朱佳奇; 陈功
Original assignee: Shanghai Institute of Quality Inspection and Technical Research
Current assignee: Shanghai Institute of Quality Inspection and Technical Research
Priority date: 2022-01-25
Filing date: 2022-01-25
Publication date: 2022-04-29

Abstract

The invention relates to a thermometer calibration device, which is characterized in that: the thermometer calibration device comprises a refrigerator, a heating assembly connected with a cold head of the refrigerator, and a constant temperature block and a bonding wire assembly which are respectively connected with the heating assembly, wherein the constant temperature block is used for fixing a standard thermometer and a thermometer to be calibrated, and the bonding wire assembly is used for being welded with a lead of the standard thermometer and a lead of the thermometer to be calibrated, so that thermal balance among the refrigerator, the heating assembly, the constant temperature block and the bonding wire assembly is realized. The invention has the advantage that the deep low temperature thermometer can be calibrated, thereby improving the accuracy of temperature measurement by using the deep low temperature thermometer.

Description

Thermometer calibration device

Technical Field

The invention relates to the technical field of thermometers, in particular to a thermometer calibration device.

Background

Temperature is one of the most basic physical dimensions, is an important attribute for evaluating materials and environment, is indispensable in production and life, and therefore, effective monitoring of temperature is extremely necessary. As an apparatus capable of monitoring temperature, the thermometer is widely applied to production and life. In recent years, in the fields of aerospace, clean energy, biomedicine, scientific research and the like, thermometers capable of detecting in extremely low-temperature environments are needed, and researchers develop a cryogenic thermometer generally covering a 4K-150K (-269-123 ℃) temperature region, and the accuracy of measured data of the cryogenic thermometer is related to success or failure of the production, process, task and experiment.

As is well known, the accuracy of temperature measurement is mainly related to the measurement accuracy of the temperature sensor itself, in addition to the test environment, the secondary instrument, the installation method, and the like. In the prior art, temperature sensors such as platinum resistors and thermocouples used in industry and having a temperature of more than 200 ℃ below zero all have standard graduation tables, and a comparison relation can be obtained between the standard temperature degree and a thermometer to be calibrated under a certain comparison condition, however, since each manufacturer has slight differences in alloy content, manufacturing process and the like in the actual production process, the relation between the real physical signal (such as resistance) and the temperature inevitably deviates from the standard graduation tables, especially in a temperature region lower than 80 ℃, and therefore a thermometer calibration device is urgently needed for calibrating the deep low temperature thermometer.

Disclosure of Invention

The invention aims to provide a thermometer calibration device which can calibrate a deep low-temperature thermometer so as to improve the accuracy of temperature measurement by using the deep low-temperature thermometer.

The embodiment of the invention is realized by the following steps: the thermometer calibration device is characterized by comprising a refrigerator, a heating assembly connected with a cold head of the refrigerator, a constant temperature block and a bonding wire assembly, wherein the constant temperature block and the bonding wire assembly are respectively connected with the heating assembly, the constant temperature block is used for fixing a standard thermometer and a thermometer to be calibrated, and the bonding wire assembly is used for being welded with a lead of the standard thermometer and a lead of the thermometer to be calibrated. The welding wire assembly comprises a first flange plate fixedly arranged on the heating assembly, a second flange plate connected with the first flange plate and a connecting piece correspondingly connected between the first flange plate and the second flange plate, the connecting piece is electrically insulated from the first flange plate and the second flange plate respectively, one end of the connecting piece, which is far away from the heating assembly, is welded with a lead of the standard thermometer and a lead of the thermometer to be calibrated, and one end of the connecting piece, which is close to the heating assembly, is used for being connected with an external data acquisition device. First ring flange with the connection can be dismantled to the second ring flange, the connecting piece including fixed set up in first sub-connecting piece on the first ring flange and fixed set up in second sub-connecting piece on the second ring flange, first sub-connecting piece is close to the one end of second sub-connecting piece with second sub-connecting piece is close to but the one end of first sub-connecting piece is connected, but first sub-connecting piece is kept away from the one end of second sub-connecting piece with second sub-connecting piece is kept away from one of first sub-connecting piece is served and is provided with respectively and welds the cup. The constant temperature piece is cylindrical structure, be provided with a plurality of mounting holes on the constant temperature piece, it is a plurality of the mounting hole is followed the circumferencial direction of constant temperature piece is even and the interval is arranged, first ring flange with the second ring flange all is ring shape structure, first ring flange with the second ring flange overlaps respectively and locates outside the constant temperature piece, the quantity of connecting piece is including a plurality of, and is a plurality of the connecting piece is followed the circumferencial direction of first ring flange is even and the interval is arranged. The heating assembly comprises a connecting block and a heating wire wound on the connecting block, one end of the connecting block is fixedly connected with the cold head of the refrigerator, and the other end of the connecting block is fixedly connected with the constant temperature block and the welding wire assembly respectively. The heating assembly further comprises a third flange plate and a fourth flange plate which are concentric and arranged at intervals, the connecting block is fixedly connected between the third flange plate and the fourth flange plate, the third flange plate is fixedly connected with a cold head of the refrigerator, the fourth flange plate is fixedly connected with the constant temperature block and the welding wire assembly respectively, and the area of the fourth flange plate is larger than that of the third flange plate. And gaskets are arranged between the third flange plate and the cold head of the refrigerator and between the fourth flange plate and the constant temperature block and the welding wire assembly respectively. And the fourth flange plate is provided with a wire collecting hole for accommodating a lead wire of the standard thermometer and a lead wire of the thermometer to be calibrated. The thermometer calibration device further comprises a cold shield, an opening is formed in the cold shield, and the constant temperature block and the welding wire assembly respectively penetrate through the opening to be contained in the cold shield. The refrigerator is a pulse tube refrigerator, a GM refrigerator or a Stirling refrigerator.

The embodiment of the invention provides a thermometer calibration device which comprises a refrigerator, a heating assembly connected with a cold head of the refrigerator, and a constant temperature block and a bonding wire assembly which are respectively connected with the heating assembly, wherein the constant temperature block is used for fixing a standard thermometer and a thermometer to be calibrated, and the bonding wire assembly is used for being welded with a lead of the standard thermometer and a lead of the thermometer to be calibrated so as to realize thermal balance among the refrigerator, the heating assembly, the constant temperature block and the bonding wire assembly. The thermometer calibration device can calibrate the deep low-temperature thermometer, so that the accuracy of temperature measurement by using the deep low-temperature thermometer is improved.

Optionally, the bonding wire assembly comprises a first flange fixedly arranged on the heating assembly, a second flange connected with the first flange, and a connecting piece correspondingly connected between the first flange and the second flange, the connecting piece is electrically insulated from the first flange and the second flange respectively, one end of the connecting piece, which is far away from the heating assembly, is welded with a lead of the standard thermometer and a lead of the thermometer to be calibrated, and one end of the connecting piece, which is close to the heating assembly, is used for being connected with an external data acquisition device.

Optionally, first ring flange with the connection can be dismantled to the second ring flange, the connecting piece including fixed set up in first sub-connecting piece on the first ring flange and fixed set up in second sub-connecting piece on the second ring flange, first sub-connecting piece is close to the one end of second sub-connecting piece with second sub-connecting piece is close to but the one end of first sub-connecting piece is connected, but first sub-connecting piece is kept away from the one end of second sub-connecting piece with second sub-connecting piece is kept away from one of first sub-connecting piece is served and is provided with respectively and welds the cup.

Optionally, the constant temperature piece is cylindrical structure, be provided with a plurality of mounting holes on the constant temperature piece, it is a plurality of the mounting hole is followed the even and interval of circumferencial direction of constant temperature piece is arranged, first ring flange with the second ring flange all is ring annular structure, first ring flange with the second ring flange overlaps respectively and locates outside the constant temperature piece, the quantity of connecting piece includes a plurality ofly, and is a plurality of the connecting piece is followed the even and interval of circumferencial direction of first ring flange is arranged.

Optionally, the heating assembly comprises a connecting block and a heating wire wound on the connecting block, one end of the connecting block is fixedly connected with the cold head of the refrigerator, and the other end of the connecting block is fixedly connected with the constant temperature block and the welding wire assembly respectively.

Optionally, the heating assembly further comprises a third flange plate and a fourth flange plate which are concentric and arranged at intervals, the connecting block is fixedly connected between the third flange plate and the fourth flange plate, the third flange plate is fixedly connected with the cold head of the refrigerator, the fourth flange plate is respectively fixedly connected with the constant temperature block and the welding wire assembly, and the area of the fourth flange plate is larger than that of the third flange plate.

Optionally, gaskets are disposed between the third flange plate and the cold head of the refrigerator and between the fourth flange plate and the thermostatic block and the welding wire assembly, respectively.

Optionally, a wire collecting hole is formed in the fourth flange plate and used for accommodating a lead wire of the standard thermometer and a lead wire of the thermometer to be calibrated.

Optionally, the thermometer calibration device further comprises a cold shield, an opening is formed in the cold shield, and the constant temperature block and the bonding wire assembly respectively penetrate through the opening to be accommodated in the cold shield.

Optionally, the cryocooler is a pulse tube cryocooler, a GM cryocooler, or a stirling cryocooler.

The embodiment of the invention has the beneficial effects that:

the thermometer calibration device comprises a refrigerator, a heating assembly connected with a cold head of the refrigerator, and a constant temperature block and a welding wire assembly which are respectively connected with the heating assembly, wherein the refrigerator is used as a cold source, the heating assembly is used as a heat source, the test temperature can be adjusted through the common cooperation of the refrigerator and the heating assembly, the constant temperature block is used for fixing a standard thermometer and a thermometer to be calibrated, and the welding wire assembly is used for welding a lead of the standard thermometer and a lead of the thermometer to be calibrated so as to realize thermal balance among the refrigerator, the heating assembly, the constant temperature block and the welding wire assembly. The thermometer calibration device can form the heat anchor through the combined action of the bonding wire assembly and the lead, so that the heat leakage phenomenon caused by the lead is eliminated, and therefore the thermometer calibration device can calibrate the deep low-temperature thermometer by adopting a thermal compensation method, and the accuracy of temperature measurement by utilizing the deep low-temperature thermometer is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are used for the cold shield required in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and that for a person skilled in the art, other related drawings can also be obtained from these drawings without inventive effort.

FIG. 1 is a schematic structural diagram of a thermometer calibration device of the present invention;

FIG. 2 is a schematic view of a wire bonding assembly in the thermometer calibration device of the present invention;

FIG. 3 is an exploded view of a wire bonding assembly in the thermometer calibration device of the present invention;

FIG. 4 is an exploded view of the attachment member of the present invention in a thermometer calibration device;

FIG. 5 is a schematic view of the thermometer calibration device of the present invention with a cold shield;

FIG. 6 is a schematic view of the thermometer of the present invention;

icon: 10-a refrigerator; 11-cold head; 20-a heating assembly; 21-a third flange; 22-a fourth flange; 221-a trunking hole; 222-a snap hole; 23-connecting blocks; 30-constant temperature block; 31-mounting holes; 40-a wire bonding assembly; 41-a first flange; 42-a second flange; 43-a connector; 44-a welding cup; 50-a gasket; 60-cold shielding; 70-a thermometer; 80-thermometer leads; 100-thermometer calibration device.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be internal to both elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The invention discloses a thermometer calibration device which comprises a refrigerator, a heating assembly connected with a cold head of the refrigerator, and a constant temperature block and a bonding wire assembly which are respectively connected with the heating assembly, wherein the constant temperature block is used for fixing a standard thermometer and a thermometer to be calibrated, and the bonding wire assembly is used for being welded with a lead of the standard thermometer and a lead of the thermometer to be calibrated so as to realize thermal balance among the refrigerator, the heating assembly, the constant temperature block and the bonding wire assembly. The thermometer calibration device can calibrate the deep low-temperature thermometer, so that the accuracy of temperature measurement by using the deep low-temperature thermometer is improved.

Referring to fig. 1 and 2 in combination, the present application provides a thermometer calibrating apparatus 100, which includes a refrigerator 10, a heating assembly 20 connected to a cold head 11 of the refrigerator 10, and a constant temperature block 30 and a wire bonding assembly 40 respectively connected to the heating assembly 20, wherein the constant temperature block 30 is used for fixing a standard thermometer and a thermometer to be calibrated, and the wire bonding assembly 40 is used for welding a lead of the standard thermometer and a lead of the thermometer to be calibrated, so as to achieve thermal equilibrium among the refrigerator 10, the heating assembly 20, the constant temperature block 30 and the wire bonding assembly 40. The thermometer calibration device 100 can calibrate the deep low temperature thermometer, thereby improving the accuracy of temperature measurement by using the deep low temperature thermometer.

It should be noted that the thermometer calibration device 100 includes a refrigerator 10 and a heating assembly 20, where the refrigerator 10 is used as a cold source, and the heating assembly 20 is used as a heat source, when the thermometer calibration device 100 is used, the test temperature is first reduced to the minimum (for example, 4K) by the refrigerator 10, and then is gradually increased by the heating assembly 20, that is, the test temperature can be adjusted by the cooperation of the refrigerator 10 and the heating assembly 20, and data acquisition is performed at a plurality of test temperatures by an external data acquisition device, so that calibration of the thermometer to be calibrated is achieved by using a thermal compensation method.

The thermometer calibration device 100 further comprises a constant temperature block 30 and a bonding wire assembly 40, wherein the constant temperature block 30 is used for fixing a standard thermometer and a thermometer to be calibrated, the bonding wire assembly 40 is used for being welded with a lead of the standard thermometer and a lead of the thermometer to be calibrated, when the thermometer calibration device 100 is used, the standard thermometer and the thermometer to be calibrated are firstly respectively fixed on the constant temperature block 30, and then the lead of the standard thermometer and the lead of the thermometer to be calibrated are respectively welded on the bonding wire assembly 40. And because the cold head 11 of the refrigerator 10 is connected with the heating assembly 20, and the heating assembly 20 is connected with the constant temperature block 30 and the wire bonding assembly 40 respectively, a heat anchor can be formed by the combined action of the wire bonding assembly 40 and the lead, so that the heat leakage phenomenon caused by the lead is eliminated, and the accuracy of the thermometer calibration device 100 is further ensured.

Furthermore, refrigerator 10, heating assembly 20, thermostatic block 30, and wire bonding assembly 40 all need to be capable of heat transfer to enable thermal equilibrium among refrigerator 10, heating assembly 20, thermostatic block 30, and wire bonding assembly 40. Among them, the refrigerator 10 may be a pulse tube refrigerator 10, a GM refrigerator 10, or a stirling refrigerator 10. The material of constant temperature block 30 can be oxygen-free copper to make constant temperature block 30 can realize the samming, heating element 20 and welding assembly's material can be oxygen copper, so that the heat can better spread.

As described above, the thermometer calibration device 100 includes the refrigerator 10, the heating assembly 20 connected to the cold head 11 of the refrigerator 10, and the thermostatic block 30 and the bonding wire assembly 40 respectively connected to the heating assembly 20, wherein the refrigerator 10 serves as a cold source, the heating assembly 20 serves as a heat source, the test temperature can be adjusted by the cooperation of the refrigerator 10 and the heating assembly 20, the thermostatic block 30 is used for fixing the standard thermometer and the thermometer to be calibrated, and the bonding wire assembly 40 is used for welding with the lead of the standard thermometer and the lead of the thermometer to be calibrated, so that thermal balance among the refrigerator 10, the heating assembly 20, the thermostatic block 30 and the bonding wire assembly 40 is achieved. The thermometer calibration device 100 can form a heat anchor through the combined action of the bonding wire assembly 40 and the lead, so that the heat leakage phenomenon caused by the lead is eliminated, and therefore the thermometer calibration device 100 can calibrate the deep low temperature thermometer by adopting a thermal compensation method, and the accuracy of temperature measurement by utilizing the deep low temperature thermometer is improved.

As shown in fig. 1 and 2, in the present embodiment, the wire bonding assembly 40 includes a first flange 41 fixedly disposed on the heating assembly 20, a second flange 42 connected to the first flange 41, and a connecting member 43 correspondingly connected between the first flange 41 and the second flange 42, wherein the connecting member 43 is electrically insulated from the first flange 41 and the second flange 42, one end of the connecting member 43 away from the heating assembly 20 is soldered to a lead of a standard thermometer and a lead of a thermometer to be calibrated, and one end of the connecting member 43 close to the heating assembly 20 is used for connecting to an external data acquisition device.

It should be noted that, when the thermometer calibration device 100 is used, the lead of the standard thermometer and the lead of the thermometer to be calibrated are welded on the connecting piece 43 and connected with the external data acquisition device through the connecting piece 43, so that the simplicity of use of the thermometer calibration device 100 can be further improved on the premise of eliminating the heat leakage phenomenon caused by the lead, the lead does not need to be attached and wound above the copper column to form a heat anchor as in the prior art, the welding mode is simpler than the winding mode, and the difference and uncertainty caused by manual winding of the lead can be avoided.

In addition, the connecting member 43 is correspondingly connected between the first flange 41 and the second flange 42, and the connecting member 43 is electrically insulated from the first flange 41 and the second flange 42, the connecting portion between the connecting member 43 and the first flange 41 and the second flange 42 may be provided with an insulating material, such as plastic, or the like, or the connecting portion between the connecting member 43 and the first flange 41 and the second flange 42 may be coated with an insulating coating, such as an insulating paint or the like.

Furthermore, in this embodiment, the first flange 41 is detachably connected to the second flange 42, the connecting member 43 includes a first sub-connecting member 43 fixedly disposed on the first flange 41 and a second sub-connecting member 43 fixedly disposed on the second flange 42, one end of the first sub-connecting member 43 close to the second sub-connecting member 43 is connected to one end of the second sub-connecting member 43 close to the first sub-connecting member 43 in a pluggable manner, and one end of the first sub-connecting member 43 far away from the second sub-connecting member 43 and one end of the second sub-connecting member 43 far away from the first sub-connecting member 43 are respectively provided with the solder cups 44.

In other words, the first sub-connector 43 and the second sub-connector 43 respectively include a plug end and a welding end, and the plug end of the first sub-connector 43 and the plug end of the second sub-connector 43 are matched with each other to realize a pluggable connection, for example, the plug end of the first sub-connector 43 is a male connector, and the plug end of the second sub-connector 43 is a female connector, or the plug end of the first sub-connector 43 is a female connector, and the plug end of the second sub-connector 43 is a male connector, and the welding end of the first sub-connector 43 and the welding end of the second sub-connector 43 are respectively provided with a welding cup to facilitate lead welding.

Therefore, because the first flange 41 and the second flange 42 are detachably connected, and the first sub-connecting member 43 and the second sub-connecting member 43 are connected in a pluggable manner, when the thermometer calibration device 100 is used, the second flange 42 can be detached from the first flange 41, in the process, the second sub-connecting member 43 and the first sub-connecting member 43 are also disconnected synchronously, the lead is welded at the welding end of the second sub-connecting member 43, then the second flange 42 and the first flange 41 are fixedly mounted, and in the process, the second sub-connecting member 43 and the first sub-connecting member 43 are also restored synchronously. The split welding assembly may further improve the ease and stability of use of the thermometer calibration device 100 as compared to an integrated welding assembly.

As shown in fig. 1, in the present embodiment, the thermostatic block 30 is a cylindrical structure, a plurality of mounting holes 31 are formed in the thermostatic block 30, the mounting holes 31 are uniformly and alternately arranged along the circumferential direction of the thermostatic block 30, wherein the mounting holes 31 may have different apertures to match with standard thermometers and thermometers to be calibrated of different specifications, so as to improve the application range of the thermometer calibration apparatus 100.

As shown in fig. 1 and fig. 2, in this embodiment, the first flange 41 and the second flange 42 are both in circular ring structures, the first flange 41 and the second flange 42 are respectively sleeved outside the constant temperature block 30, and a gap may be provided between the outer wall surface of the constant temperature block 30 and the inner wall surface of the first flange 41 and the inner wall surface of the second flange 42, so as to ensure that the standard thermometer on the constant temperature block 30 and the thermometer to be calibrated can be unaffected, and the first flange 41 and the second flange 42 of the split type welding assembly can be conveniently released from being fixed and fixed. In addition, since one thermometer 70 is connected with four leads 80, the number of the connecting members 43 includes a plurality of connecting members 43, and the plurality of connecting members 43 are uniformly and alternately arranged along the circumferential direction of the first flange 41, so that the leads can be conveniently welded to the connecting members 43, and the wiring manner of the leads can be improved.

As shown in fig. 1, in the present embodiment, the heating assembly 20 includes a connection block 23 and a heating wire (not shown) wound around the connection block 23, one end of the connection block 23 is fixedly connected to the cold head 11 of the refrigerator 10, and the other end is fixedly connected to the constant temperature block 30 and the wire welding assembly 40. The heating wire can be connected with an external controller, so that the opening and closing and the working power of the heating wire can be flexibly regulated and controlled through the controller, and the test data under different test temperatures can be conveniently acquired.

As shown in fig. 1, in the present embodiment, the heating assembly 20 further includes a third flange 21 and a fourth flange 22 concentrically and spaced apart from each other, the connecting block 23 is fixedly connected between the third flange 21 and the fourth flange 22, the third flange 21 is fixedly connected to the cold head 11 of the refrigerator 10, the fourth flange 22 is fixedly connected to the thermostatic block 30 and the bonding wire assembly 40, respectively, and the area of the fourth flange 22 is larger than that of the third flange 21, so that the fourth flange 22 can provide a larger area for the supporting surfaces of the thermostatic block 30 and the bonding assembly, and the thermometer calibration apparatus 100 is more stable and reliable.

As shown in fig. 1, in the present embodiment, spacers 50 are disposed between the third flange 21 and the cold head 11 of the refrigerator 10 and between the fourth flange 22 and the thermostatic block 30 and the wire bonding assembly 40, respectively, so that when the heating assembly 20 works to apply heat flow, a temperature difference can be generated between components located at two sides of the spacer 50 through the thermal resistance of the spacer 50, thereby preventing the heating assembly 20 from working to adversely affect other components.

As shown in fig. 1, in the present embodiment, the fourth flange 22 is provided with a wire collecting hole 221 for receiving the lead wire of the standard thermometer and the lead wire of the thermometer to be calibrated, so that the lead wires can be received in the wire collecting hole 221 more regularly and neatly. The size of the opening of the wire collecting hole 221 far from the center of the fourth flange 22 should be smaller than the size of the opening of the wire collecting hole 221 near the center of the fourth flange 22, so that the lead wire can enter the wire collecting hole 221 through the opening and can not easily leave the wire collecting hole 221 through the opening without external force.

Optionally, the thermometer calibration apparatus 100 further includes a cold shield, the cold shield is provided with an opening, and the constant temperature block 30 and the bonding wire assembly 40 are respectively received in the cold shield through the opening, so as to prevent the thermometer calibration apparatus 100 from being affected by the external environment temperature through the cold shield. Wherein, can be provided with the joint piece on the cold shield, can correspond on the fourth ring flange 22 and be provided with joint hole 222 to cold shield 60 is fixed in quick joint installation, thereby makes cold shield and fourth ring flange 22 cooperate jointly to form and seals the cavity. In addition, the material of cold shield cover can be oxygen-free copper, and the quantity of cold shield cover can be a plurality of, and a plurality of cold shield covers overlap in proper order and establish and form "cover child" structure.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The thermometer calibration device is characterized by comprising a refrigerator, a heating assembly connected with a cold head of the refrigerator, a constant temperature block and a bonding wire assembly, wherein the constant temperature block and the bonding wire assembly are respectively connected with the heating assembly, the constant temperature block is used for fixing a standard thermometer and a thermometer to be calibrated, and the bonding wire assembly is used for being welded with a lead of the standard thermometer and a lead of the thermometer to be calibrated.

2. The thermometer calibration device according to claim 1, wherein the bonding wire assembly comprises a first flange fixedly disposed on the heating assembly, a second flange connected to the first flange, and a connecting member correspondingly connected between the first flange and the second flange, the connecting member is electrically insulated from the first flange and the second flange, one end of the connecting member, which is far away from the heating assembly, is welded to the lead of the standard thermometer and the lead of the thermometer to be calibrated, and one end of the connecting member, which is close to the heating assembly, is used for connecting to an external data acquisition device.

3. The thermometer calibration device according to claim 2, wherein the first flange plate is detachably connected to the second flange plate, the connecting member includes a first sub-connecting member fixedly disposed on the first flange plate and a second sub-connecting member fixedly disposed on the second flange plate, one end of the first sub-connecting member close to the second sub-connecting member is connected to one end of the second sub-connecting member close to the first sub-connecting member in a pluggable manner, and one end of the first sub-connecting member far away from the second sub-connecting member and one end of the second sub-connecting member far away from the first sub-connecting member are respectively provided with a solder cup.

4. The thermometer calibration device according to claim 1, wherein the thermostatic block is of a cylindrical structure, a plurality of mounting holes are formed in the thermostatic block, the mounting holes are arranged along the circumferential direction of the thermostatic block at intervals, the first flange and the second flange are both of annular structures, the first flange and the second flange are respectively sleeved outside the thermostatic block, and the connecting pieces are arranged in a plurality of numbers and are arranged along the circumferential direction of the first flange at intervals.

5. The thermometer calibrating device according to claim 1, wherein the heating assembly comprises a connecting block and a heating wire wound on the connecting block, one end of the connecting block is fixedly connected with the cold head of the refrigerator, and the other end of the connecting block is fixedly connected with the constant temperature block and the welding wire assembly respectively.

6. A thermometer calibration device as defined in claim 5, wherein the heating assembly further comprises a third flange plate and a fourth flange plate which are concentric and arranged at intervals, the connection block is fixedly connected between the third flange plate and the fourth flange plate, the third flange plate is fixedly connected with the cold head of the refrigerator, the fourth flange plate is respectively fixedly connected with the constant temperature block and the wire welding assembly, and the area of the fourth flange plate is larger than that of the third flange plate.

7. A thermometer calibrating device according to claim 6, wherein a gasket is provided between said third flange plate and the cold head of said refrigerator and between said fourth flange plate and said thermostatic block and said weld line assembly, respectively.

8. The thermometer calibrating device according to claim 6, wherein the fourth flange is provided with a wire collecting hole for receiving a lead wire of the standard thermometer and a lead wire of the thermometer to be calibrated.

9. The thermometer calibrating device according to claim 1, further comprising a cold shield, wherein the cold shield is provided with an opening, and the thermostatic block and the bonding wire assembly are respectively received in the cold shield through the opening.

10. A thermometer calibrating device as defined in claim 1, wherein said refrigerator is a pulse tube refrigerator, a GM refrigerator or a stirling refrigerator.