CN107389224A - For thermocouple cold junction freezing point compensation device - Google Patents

For thermocouple cold junction freezing point compensation device Download PDF

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Publication number
CN107389224A
CN107389224A CN201710662067.5A CN201710662067A CN107389224A CN 107389224 A CN107389224 A CN 107389224A CN 201710662067 A CN201710662067 A CN 201710662067A CN 107389224 A CN107389224 A CN 107389224A
Authority
CN
China
Prior art keywords
container
wire
ice
freezing point
compensation device
Prior art date
Application number
CN201710662067.5A
Other languages
Chinese (zh)
Inventor
陈勇
杨锦云
Original Assignee
深圳市华星光电技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 深圳市华星光电技术有限公司 filed Critical 深圳市华星光电技术有限公司
Priority to CN201710662067.5A priority Critical patent/CN107389224A/en
Publication of CN107389224A publication Critical patent/CN107389224A/en

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01KMEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K15/00Testing or calibrating of thermometers
    • G01K15/002Calibrated temperature sources, temperature standards therefor
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01KMEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K15/00Testing or calibrating of thermometers
    • G01K15/005Calibration

Abstract

The invention provides one kind to be used for thermocouple cold junction freezing point compensation device, including the first container, mixture of ice and water is housed in first container, first container is provided with opening, supporting part is provided with opening, it is inserted with two second containers and thermometer respectively on supporting part, the measurement end and second container of thermometer stretch into this partial containers body in the first container and immersed in mixture of ice and water, iknsulating liquid for insulating radiation is housed in second container, second container is provided with opening, second container plug is provided with opening, wire is respectively equipped with two second containers, the part wire body of the wire is immersed in iknsulating liquid, the both ends of wire extend out to second container beyond the Great Wall through second container plug.Compared with prior art, wire is isolated with mixture of ice and water, avoided when ensure that wire is under 0 DEG C of environment it is impure because of mixture of ice and water caused by short circuit problem;And ensure that wire is under 0 DEG C of environment, improve the accuracy of calibration.

Description

For thermocouple cold junction freezing point compensation device

Technical field

The present invention relates to a kind of e measurement technology, particularly one kind to be used for thermocouple cold junction freezing point compensation device.

Background technology

Thermocouple thermometer is widely used temperature measuring equipment in the industrial production, and its is simple in construction, easy to use, The degree of accuracy is high, and range ability is wide, antivibration, is measured suitable for high temperature warm area.Its temperature-measurement principle is:The conductor of two kinds of different components (being referred to as thermocouple silk material or thermode) both ends are bonded into loop, when the temperature difference at abutment, will produce in the loop Electromotive force, this phenomenon is referred to as pyroelectric effect, and this electromotive force is referred to as thermoelectrical potential.Thermocouple is exactly to be carried out using this principle Temperature survey, wherein, the one end for being directly used as measuring medium temperature is called working end (also referred to as measurement end), and the other end is called Cold end (also referred to as compensating end);Cold end is connected with display instrument or matching instrument, and display instrument would indicate that caused by thermocouple Thermoelectrical potential.

The method of calibration thermocouple thermometer is with reference to national metrological verification regulations at present《JJG 617-1996 digital temperatures Indicating regulator is examined and determine》Carry out.Method is:

1) according to thermo-electromotive force and the functional relation of temperature, thermocouple indexing table is made;Phasing meter is compensating end temperature 0 DEG C when under conditions of obtain, different thermocouples has different phasing meters.

2) working end is replaced with standard direct voltage source, different temperatures pair is exported according to the functional relation of electromotive force and temperature The magnitude of voltage answered is to when school instrument (wiring diagram is as shown in Figure 2 during calibration);

3) show value for treating school instrument is read, by comparing the mark for treating that school instrument show value and standard direct voltage source export Quasi- value, you can draw error amount, complete calibration.

The connection end of compensating wire and copper conductor needs to be placed in the freezing point device of 0 DEG C of condition in a calibration process, 《JJG 617-1996 digital temperatures indicating regulator is examined and determine》In unspecified ice bank preparation method, but in the code A kind of calibration method wiring diagram (shown in Fig. 1) has been prompted, if according to Fig. 1 mode of connection, there can be following defect:Such as ice bank Middle frozen water is not pure, and frozen water conduction will cause two copper cash short circuits, so that calibration is inaccurate, failure criteria is also possible to when serious Direct voltage source.

The content of the invention

For overcome the deficiencies in the prior art, the present invention provides one kind and is used for thermocouple cold junction freezing point compensation device so that energy Enough ensure to avoid mixture of ice and water impure caused short circuit problem while wire is under 0 DEG C of environment, improve calibration Accuracy.

The invention provides one kind to be used for thermocouple cold junction freezing point compensation device, including the first container, first container In mixture of ice and water is housed, first container is provided with opening, and supporting part is provided with opening, is inserted with respectively on supporting part Two second containers and thermometer, this part that the measurement end and second container of the thermometer are stretched into the first container hold Body is immersed in mixture of ice and water, the iknsulating liquid for insulating radiation is housed, on the second container in the second container Provided with opening, second container plug is provided with opening, wire is respectively equipped with two second containers, the part of the wire is led Wire body is immersed in iknsulating liquid, and the both ends of wire extend out to second container beyond the Great Wall through second container plug.

Further, the ratio of ice and water is 1 in the mixture of ice and water:1.

Further, the iknsulating liquid is transformer oil.

Further, the supporting part is the container stopper that a cross sectional shape is inverted trapezoidal, close to container stopper on container stopper The through hole passed through for second container and thermometer is respectively equipped with center.

Further, first container is the container with heat insulation function.

Further, the wire includes copper conductor section and compensating wire section, the copper conductor section and compensating wire section One end stretch into second container and be connected, this part wire that the copper conductor section and compensating wire section are stretched into second container At least both connecting places are immersed in iknsulating liquid in body.

Further, the distance between the bottom of the second container and the bottom of the first container are the first container height 1/3rd.

Further, the distance between the measurement end end of the thermometer and the bottom of the first container are high for the first container The half of degree.

Further, the temperature is calculated as mercurial thermometer.

Further, the ice is cotton-shaped ice.

The present invention compared with prior art, sets second container between mixture of ice and water and wire, and in second container The middle iknsulating liquid for loading cooling insulation, so that wire is isolated with mixture of ice and water, it ensure that wire under 0 DEG C of environment When avoid the short circuit problem caused by mixture of ice and water is not pure;And ensure that wire is under 0 DEG C of environment, improve The accuracy of calibration.

Brief description of the drawings

Fig. 1 is the wiring diagram of existing electric thermo-couple temperature meter calibrating;

Fig. 2 is internal structure schematic diagram of the present invention;

Fig. 3 is the wiring diagram of the present invention.

Embodiment

The present invention is described in further detail with reference to the accompanying drawings and examples.

As shown in Fig. 2 one kind of the present invention is used for thermocouple cold junction freezing point compensation device, including the first container 7, first Mixture of ice and water 8 is housed, first container 7 is provided with opening, and supporting part 3, the envelope of supporting part 3 are provided with opening in container 7 The opening of the first container 7 is closed, is inserted with two second containers 5 and thermometer 2, the survey of the thermometer 2 respectively on supporting part 3 Amount end and second container 5 stretch into this partial containers body in the first container 7 and immersed in mixture of ice and water 8, and second container 5 immerses This partial containers body of mixture of ice and water 8 is not contacted with the bottom of the first container 7 and chamber wall, and thermometer 2, which immerses frozen water, to be mixed The measurement end of compound 8 and body portion do not contact with the bottom of the first container 7 and chamber wall, equipped with use in the second container 5 In the iknsulating liquid 6 of insulating radiation, the second container 5 is provided with opening, and second container plug 1 is provided with opening, and second holds Device plug 1 is used to close the opening of second container 5, is respectively equipped with wire 4 in two second containers 5, respectively the first wire 10, Second wire 11, the part wire body of the wire 11 of the first wire 10 and second are immersed in iknsulating liquid 6, the first wire 10 It is extend out to the both ends of the second wire 11 through second container plug 1 outside second container plug 1;Specifically, thermometer 2 is located at two the Between two containers 5, and the spacing between second container 5 and thermometer 2 is equal;The ratio of ice and water is 1 in mixture of ice and water 8: 1, wherein ice is cotton-shaped ice, and the temperature of water can be that normal-temperature water or temperature are more than 0 DEG C and the water less than 25 DEG C;Iknsulating liquid 6 is Transformer oil;Temperature is calculated as mercurial thermometer.

In the present invention, the volume of the first container 7 is more than 2 liters, and the volume of second container 5 is more than 20 milliliters and less than first / 3rd of the volume of container 7;As a preferred embodiment, second container 5 is teat glass.

As shown in Fig. 2 supporting part 3 is the container stopper that a cross sectional shape is inverted trapezoidal, on container stopper in container stopper The through hole 9 passed through for second container 5 and thermometer 2 is respectively equipped with the heart, three through holes 9 arrange on the same line.

As shown in Fig. 2 two wire guides 12 for being used to pass through for wire are provided with second container plug 1, below with first The interspersed mode of first wire 10 and the second wire 11 is illustrated exemplified by wire 10, one end of the first wire 10 holds from second The upper end of device plug 1 pass through one of second container plug 1 a wire guide 12 enter second container 5 in after led again from another String holes 12 is passed outside the upper end of second container plug 1, it is noted herein that, part wire body is left in second container 5 and is soaked Enter in iknsulating liquid 6, but the invention is not restricted to this, can also be in the following way:

As shown in Fig. 2 the wire 11 of the first wire 10 and second includes copper conductor section 15 and compensating wire section 16, The copper conductor section 15 is stretched into second container 5 and is connected with one end of compensating wire section 16, the copper conductor section 15 and compensation Conducting line segment 16 stretches into this part wire body in second container 5 at least both connecting places and immersed in iknsulating liquids 6;Specifically, The half for this part wire body length that the copper conductor section 15 is stretched into second container 5 with compensating wire section 16 immerses exhausted In edge liquid 6.

In the present invention in order to ensure the temperature of mixture of ice and water 8, the first container 7 is the container with heat insulation function, tool Body is heat-preserving container.

In the present invention, the distance between the bottom of the second container 5 and bottom of the first container 7 are high for the first container 7 / 3rd of degree;The distance between the measurement end end of the thermometer 2 and bottom of the first container 7 are high for the first container 7 The half of degree degree.

, will wherein one as shown in figure 3, by the present invention with as follows by the connection of checking device 13 and standard direct voltage source 14 Compensating wire section 16 connects in the first wire 10 on individual second container 5 connects standard direct current by checking device 13, copper conductor section 15 Potential source 14, the first wire 10 connect one end (such as positive pole) by checking device 13 and the identical polar of standard direct voltage source 16, separately Compensating wire section connects in the second wire 11 on one second container 5 connects standard direct current by checking device 13, copper conductor section 15 Potential source 14, the second wire 11 connect (such as negative by one end of 14 another identical polar of checking device 13 and standard direct voltage source Pole), so as to complete to connect.

Preparation to the present invention program below carries out simple illustration to implementation process:

First, material prepares, and make needs following material for thermocouple cold junction freezing point compensation device:Second container (glass Test tube) 5 two, 2 one, thermometer (mercurial thermometer), supporting part (stopper) 3 one, 1 liang of second container plug (test tube stopper) Individual, iknsulating liquid 6 (transformer oil) about 20mL, the about 2L of mixture of ice and water 8,7 one, the first container (heat-preserving container);

2nd, punched on supporting part 3, the diameter of second container 5, thermometer 2 is measured with slide calliper rule, by being measured on supporting part 3 The diameter data of survey punches to form through hole 9, wherein the centre position for being arranged on supporting part 3 for the through hole 9 of thermometer insertion; Make two wire guides 12 respectively on two second container plugs 1;

3rd, after through hole 9 and wire guide 12 are accomplished fluently, by second container 5 and thermometer 2 insert respectively corresponding in through hole 9, this When be noted that this partial containers body that second container 5 stretched into the first container and the survey that thermometer 2 is stretched into the first container Measure end and do not contacted with the chamber wall and container bottom of the first container 7, the bottom of second container 5 and the bottom of the first container 7 The distance between be 1/3rd of the first container height, mercurial thermometer load position can not with the chamber wall of the first container with And container bottom contact, the distance of the measurement end end of thermometer 2 to the first container bottom bottom for the height of the first container 5 two/ One;

4th, two second containers are filled into iknsulating liquid 6, second container plug is clogged to the opening of second container 5, by respectively First wire 10 and the second wire 11 are immersed in transformer oil by the wire guide of second container beyond the Great Wall respectively;Specifically, will Copper conductor section 15 in first wire 10 stretches into the second appearance with compensating wire section 16 from the wire guide 12 on a second container plug 1 In device and it is connected, the assembly method of the second wire 11 is identical with the assembly method of the first wire 10, is not repeating herein;

5th, take block ice to be smashed with ice crusher and cotton-shaped ice is made, according to 1:1 ratio, cotton-shaped ice and water are added first and held In device 7, mixture of ice and water 8 is fabricated to, now by supporting part plug in the opening of the first container 7, and by second container 5 and temperature The measurement end of degree meter 2 is inserted from through hole 9, the partial containers body of second container 5 and the measurement end of thermometer 2 is placed in frozen water and is mixed In compound 8;

6th, about half an hour is stood, observation thermometer instruction, when thermometer is designated as 0 DEG C, you can use.

Compensating wire section is connected using the second container equipped with iknsulating liquid and is placed in insulating by the present invention with copper conductor section In liquid, it is set to isolate with mixture of ice and water, frozen water is impure in being avoided when ensure that wire is under 0 DEG C of environment such as ice bank Short circuit problem caused by net and the problem of avoid standard direct voltage source from being damaged;The present invention is simple in construction, and cost is very low. The present apparatus adds thermometer, and the temperature of mixture of ice and water is monitored in real time, ensures to be under 0 DEG C of environment during calibration, carries The high accuracy of calibration.

Although the present invention has shown and described with reference to specific embodiment, it should be appreciated by those skilled in the art that: In the case where not departing from the spirit and scope of the present invention limited by claim and its equivalent, can carry out herein form and Various change in details.

Claims (10)

1. one kind is used for thermocouple cold junction freezing point compensation device, it is characterised in that:Including the first container (7), first container (7) mixture of ice and water (8) is housed, first container (7) is provided with opening, and supporting part (3) is provided with opening, is being supported in Two second containers (5) and thermometer (2), the measurement end and second container of the thermometer (2) are inserted with portion (3) respectively (5) stretch into this partial containers body in the first container (7) to immerse in mixture of ice and water (8), equipped with use in the second container (5) In the iknsulating liquid (6) of insulating radiation, the second container (5) is provided with opening, and second container plug (1) is provided with opening, Wire (4) is respectively equipped with two second containers (5), the part wire body of the wire (4) is immersed in iknsulating liquid (6), The both ends of wire (4) extend out to second container plug (1) outside through second container plug (1).
2. according to claim 1 be used for thermocouple cold junction freezing point compensation device, it is characterised in that:The mixture of ice and water (8) ratio of ice and water is 1 in:1.
3. according to claim 1 be used for thermocouple cold junction freezing point compensation device, it is characterised in that:The iknsulating liquid (6) it is transformer oil.
4. according to claim 1 be used for thermocouple cold junction freezing point compensation device, it is characterised in that:The supporting part (3) For the container stopper that a cross sectional shape is inverted trapezoidal, it is respectively equipped with container stopper at container stopper center for second container (5) And the through hole (9) that thermometer (2) passes through.
5. according to claim 1 be used for thermocouple cold junction freezing point compensation device, it is characterised in that:First container (7) it is the container with heat insulation function.
6. according to claim 1 be used for thermocouple cold junction freezing point compensation device, it is characterised in that:Wire (4) bag Include copper conductor section (15) and compensating wire section (16), one end of the copper conductor section (15) and compensating wire section (16) stretches into the In two containers (5) and it is connected, this part that the copper conductor section (15) is stretched into second container (5) with compensating wire section (16) is led At least both connecting places are immersed in iknsulating liquid (6) in wire body.
7. according to claim 1 be used for thermocouple cold junction freezing point compensation device, it is characterised in that:The second container (5) the distance between bottom and the bottom of the first container (7) are 1/3rd of the first container (7) height.
8. it is used for thermocouple cold junction freezing point compensation device according to claim 1 or 7, it is characterised in that:The thermometer (2) the distance between measurement end end and the bottom of the first container (7) are the half of the first container (7) height.
9. according to claim 1 be used for thermocouple cold junction freezing point compensation device, it is characterised in that:The thermometer (2) For mercurial thermometer.
10. according to claim 2 be used for thermocouple cold junction freezing point compensation device, it is characterised in that:The ice is cotton-shaped Ice.
CN201710662067.5A 2017-08-04 2017-08-04 For thermocouple cold junction freezing point compensation device CN107389224A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710662067.5A CN107389224A (en) 2017-08-04 2017-08-04 For thermocouple cold junction freezing point compensation device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710662067.5A CN107389224A (en) 2017-08-04 2017-08-04 For thermocouple cold junction freezing point compensation device

Publications (1)

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CN107389224A true CN107389224A (en) 2017-11-24

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3738174A (en) * 1972-03-01 1973-06-12 King Nutronics Corp Temperature calibration system
CN201697729U (en) * 2009-10-21 2011-01-05 江西洪都航空工业集团有限责任公司 Analogue electronic freezing point device
CN202511915U (en) * 2012-03-30 2012-10-31 鞍钢股份有限公司 Simple and easy constant-temperature detecting device for reference end of thermocouple

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3738174A (en) * 1972-03-01 1973-06-12 King Nutronics Corp Temperature calibration system
CN201697729U (en) * 2009-10-21 2011-01-05 江西洪都航空工业集团有限责任公司 Analogue electronic freezing point device
CN202511915U (en) * 2012-03-30 2012-10-31 鞍钢股份有限公司 Simple and easy constant-temperature detecting device for reference end of thermocouple

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
侯素兰等: "铠装廉金属热电偶校准方法的研究", 《中国计量》 *

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Application publication date: 20171124