CN101487804B - Lubricating grease dropping point temperature measuring sensor - Google Patents
Lubricating grease dropping point temperature measuring sensor Download PDFInfo
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- CN101487804B CN101487804B CN2008101480388A CN200810148038A CN101487804B CN 101487804 B CN101487804 B CN 101487804B CN 2008101480388 A CN2008101480388 A CN 2008101480388A CN 200810148038 A CN200810148038 A CN 200810148038A CN 101487804 B CN101487804 B CN 101487804B
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Abstract
The invention provides a grease dropping point temperature sensor, which is provided with an outer thimble 3 with the outer diameter phi being more than or equal to 5mm and a thermocouple thermometer sensor with a temperature-sensing block. A temperature measuring end is filled with a metal temperature-sensing block 2 with the depth being more than or equal to 5mm. A thermocouple thermometer 9 with the diameter phi at least being 1mm penetrates into the outer thimble form the center hole of an end metal cap 10 and is penetrated in the hole with the diameter phi being 1mmm of the temperature-sensing block 2 to form an end body contact mold; a metal cap leading-out end encapsuled with epoxide resin7 is connected with an extension wire. The data reliability and stability measured by the dropping point temperature sensor matching with a dropping point temperature tester goes beyond that of a petroleum product temperature gauge of the prior art. The show value of an established field recording system can test, revise and transmit transmitting error which is less than the error of the petroleum product temperature gauge in advance and in full range. And the resolving power is increased by one order of magnitude (1 DEG C is increased into 0.1 DEG C).
Description
Technical field
The present invention relates in the dropping point analyzer dropping point temperature test system of a kind of National standard GB/T3498, GB/T4929, the temperature probe that grease dropping point is measured, this sensor shows the grease dropping point temperature through the dropping point analyzer.
Background technology
At present; Through measuring in 300 ℃; The oil-bath type dropping point analyzer of the railway grease of National standard GB/T4929; Or through measuring more than 300 ℃, the temperature probe that the grease dropping point of the aluminium stove piece formula drop point test appearance of the railway grease of National standard GB/T3498 is measured is a kind of dropping point glass-stem thermometer.Wherein, when oil-bath type and aluminium stove piece formula dropping point analyzer carried out drop point test, the reading of dropping point temperature showed that with glass-stem thermometer (its scale division value is 1 ℃ by petroleum products; Permissible error ± 3.0 ℃); Though can satisfy the government test standard-required, because petroleum products is bigger with the scale division value and the error of glass-stem thermometer, the experimenter is prone to produce interpolation in reading process; Temperature range more than 300 ℃ is traced to the source and is measured and passes difficulty simultaneously; Must have salt bath or molten tin bath that temperature is provided, it is traced to the source and to measure the biography demand few, has caused glass-stem thermometer metrological confirmation difficulty more than 300 ℃.Therefore measure accuracy and resolving power that glass liquid thermometer dropping point that grease dropping point adopts is measured, generally be difficult for reaching country and industry standard regulation ± the dropping point bioassay standard of 3 ℃ of precision.Industrial platinum resistance thermometer sensor, thermometer and thermocouple thermometer thermometric are recommended to use to the temperature survey of scope more than 300 ℃ by country.If adopt industrial platinum resistance thermometer sensor, thermometer, in middle low temperature (0-400) ℃ scope, the permission difference of industrial platinum resistance thermometer sensor, thermometer temperature is little; Precision is high, in precision measurement, generally adopts, but because worker's industry platinum resistance thermometer sensor, thermometer volume size is big slightly; It is slow to be heated; Be difficult to realize close the contact between resistance and the temperature sensor in addition, leave air-gap, thermal response time is difficult to reach the precision as mercury thermometer.
Summary of the invention
The objective of the invention is above-mentioned weak point to the existence of prior art dropping point glass-stem thermometer displays temperature; It is little to provide a kind of heat to transmit resistance; Indicating value is stable, and resolving power and accuracy are improved a lot and improved, the lubricating grease dropping point temperature measuring sensor that test accuracy and accuracy are high.
The objective of the invention is to realize like this; A kind of lubricating grease dropping point temperature measuring sensor has an electric thermo-couple temperature flowmeter sensor that has the temperature-sensitive piece, and the outer tube of external diameter >=Φ 5mm; It is characterized in that; Thermometric end at the temperature feeling ball position is filled with deeply >=the metal temperature-sensitive piece of 5mm, and diameter is at least the thermocouple thermometer of Φ 1mm, and the metal cap center pit gos deep into the said outer tube from the end, and is through in the above-mentioned temperature-sensitive piece diameter of phi 1mm hole; Constitute end body contact type, embedding has the metal cap of epoxy resin to draw the termination compensating wire.
The present invention has following beneficial effect than prior art
The present invention cooperates reliability, the stability of dropping point temperature-indicating instrument determination data to exceed petroleum products thermometer in the past.But the gamut calibrating in advance of the scene register system of setting up, displayed value, correction, transmission error is less than the transmission error of petroleum products thermometer, and resolving power has improved an one magnitude (being increased to 0.1 ℃ by 1 ℃).
All technical indicators satisfy standard GB/T3498, GB/4929 technical standard and use the requirement of technology.Select industrial thermocouple thermometer thermometric for use; Can substitute the measurement temperature that the dropping point glass-stem thermometer shows scope more than 300 ℃; Improve a lot and improve than the resolving power of glass liquid thermometer and accuracy; Further improved test accuracy and accuracy, realized that simulation is shown to the transformation that numeral shows and writes down, and be convenient to metrological confirmation.Quartz glass tube overcoat thermocouple thermometer can reach the thermal response time of the special-purpose mercury thermometer of dropping point; In slow heat test, more special-purpose mercury thermometer can be measured hot junction portion temperature sooner, and the closed-end silver bullion is difficult for oxidation.The test findings that quartzy overcoat thermocouple thermometer drop point test and glass-stem thermometer are measured is more identical, the experimental result favorable reproducibility.
Thermocouple thermometer can be widely used in surface and quick temperature measurement, and the hot junction size can be very little, and can join together closely through welding and testee or temperature sensor, reduces heat and transmits resistance, and indicating value is stable.So can select for use quartz glass outer tube thermocouple thermometer to substitute the dropping point glass-stem thermometer.When dropping point temperature measuring sensor melts at railway grease its end and railway grease contact condition with rules in mercury thermometer end and railway grease contact condition should be in full accord; Its measuring junction shape and dropping point thermometer temperature sensing bubble shape, big or small consistent have guaranteed that the railway grease surface of contact is consistent; And do not change the distribution character (homogeneity and fluctuation degree) of tested constant temperature field; In the dynamic temperature measurement process, the thermal response time of temperature sensor is less than or equal to the thermal response time of glass-stem thermometer, promptly when heating temperature sensor and instrument combine institute temperature displayed can catch up with the reading of glass-stem thermometer; The combination calculation precision of temperature-sensitive sensor and instrument is not less than glass-stem thermometer, and thermocouple thermometer and digital display meter are united use, and its resolution can reach 0.1 ℃, simultaneously the requirement of National standard GB/T4929 and GB/T3498.
The application of silver bullion is to guarantee that the proterties (surface tension) of shape (sphere) that dropping point temperature sensor of the present invention and test(ing) medium contact and surface of contact should be the same with mercury-in-glass thermometer, and the hot physical features that has guaranteed sensor probe is near the dropping point mercury-in-glass thermometer.Table 1 is that mercury compares with silver-colored performance parameter
Table 1 mercury compares with the performance parameter of silver
Description of drawings
Fig. 1 is the skeleton view of first embodiment of lubricating grease dropping point temperature measuring sensor of the present invention.
Fig. 2 is the skeleton view of second embodiment of lubricating grease dropping point temperature measuring sensor of the present invention.
Fig. 3 is the skeleton view of the 3rd embodiment of lubricating grease dropping point temperature measuring sensor of the present invention.
Fig. 4 is the skeleton view of the 4th embodiment of lubricating grease dropping point temperature measuring sensor of the present invention.
Among the figure: 1. resistive element, 2. temperature-sensitive piece, 3. outer tube, 4. aperture, 5. magnesia powder, 6. porcelain knob, 7. epoxy resin, 8, compensating wire, 9. outer tube thermocouple thermometer, 10. metal cap.
Embodiment
Fig. 1 has described and can connect digital display industry registering instrument through compensating wire 8, and forms the dropping point temperature measuring sensor of the present invention of dropping point analyzer temperature test system.This sensor has one and has temperature feeling ball, and external diameter >=Φ 5mm outer tube thermocouple thermometer 9, is filled with deeply at the thermometric end of temperature feeling ball >=the metal temperature-sensitive piece 2 of 5mm.This temperature-sensitive piece 2 is red copper or fine silver piece, and its cylindricality diameter is Φ 3mm, and the degree of depth is 5～6mm.Temperature-sensitive piece 2 central authorities are shaped on has 5mm deeply, and diameter is the center pit of Φ 1mm.The diameter of measuring junction sphere can be Φ 5.5 ± 0.5mm, and the temperature feeling ball external diameter can be 5mm, and length can be 300mm.Thermometric end shape and dropping point thermometer temperature sensing bubble shape, big or small consistent.Outside dimension is the thermocouple thermometer of Φ 1mm, gos deep into to outer tube 3 from end metal cap 10 center pits, and is through in the diameter of phi 1mm aperture 4 of above-mentioned temperature-sensitive piece 2.Outer tube 3 and above-mentioned metal cap 10 formation end body contact types are drawn the termination compensating wire, and are potted in the metal cap 10 with epoxy resin 7.Embedding has the metal cap 10 of epoxy resin 7 to draw the termination compensating wire.Outer tube 3 can make quartz glass tube, can also be metal tube.
Embodiment 1
In the embodiment shown in fig. 1, outer tube 3 is a quartz glass tube, wall thickness 1mm.Temperature-sensitive piece 2 is Φ 3 * 5～6 red copper pieces or fine silver piece.The hole dimension of temperature-sensitive piece 2 central small hole 4 can make diameter of phi 2.1mm, the dribbling face cylindrical body of dark 5mm.Temperature-sensitive piece 2 is fixedly connected with hollow porcelain knob 6, is poured into the magnesia powder 5 of being convenient to conduct heat and filling up air pocket in this hollow porcelain knob 6.The magnesia powder 5 of filling with resistive element 1 be connected lead 8 and fix.Resistive element 1 is a thin film resistor element.Resistive element 1 is installed in the bottom of temperature-sensitive piece 2 central small hole 4.Two the drawing that connects resistive element 1 connects the interior (not shown) of two Φ 0.6mm apertures that lead 8 is through porcelain knob 6; And draw from metal cap 10 exits; Connect into three-way lead-out mode with the compensating wire of thermometer, thereby constitute quartz glass tube overcoat industrial platinum resistance thermometer sensor.
Embodiment 2
In the embodiment shown in Figure 2, on the basis of the foregoing description 1, change said outer tube 3 into metal tube, import thin film resistor element 1 is placed in the Φ 2.1mm hole of temperature-sensitive piece 2, and unsettled placement.Be through with Φ 0.5mm double lead in two Φ 0.6mm apertures on Φ 2.8mm magnetic post 6 ground, put into magnesia powder 5 fixed resistive element 1 and connect lead 8, fill up air pocket.Carry in the metal cap 10 with epoxy resin 7 embeddings at last.To constitute metal tube overcoat industrial platinum resistance thermometer sensor.
Embodiment 3
In the embodiment shown in fig. 3, on the basis of the foregoing description 1, with the red copper piece of laying 3 * 5～6mm in the wall thickness 1mm quartz glass outer tube 3 or fine silver piece temperature-sensitive piece 2.Mider hole size Φ 2.1, dark 5mm.And be the E calibration armored thermocouple thermometer of Φ 1mm with outside dimension, an end is through in the Φ 1mm hole of temperature-sensitive piece 2, and an end is drawn from metal cap 10, and footpath between fields is welded in the quartz glass outer tube 3.Epoxy resin 7 is potted in the metal cap 10, makes end body contact type, because of removing the termination compensating wire, thereby constitute quartz glass tube outer tube electric thermo-couple temperature flowmeter sensor.
Embodiment 4
In the embodiment shown in fig. 4, on the basis of the foregoing description 1, change said outer tube 3 into metal tube, metal tube is outer through Φ 5mm, wall thickness 1mm.Temperature-sensitive piece 2 is Φ 5 * 5～6mm red copper piece or fine silver piece.E calibration armored thermocouple thermometer is through temperature-sensitive piece 2 in the 1mm hole, and an end stretches out for 10 kinds from metal cap, makes end body contact type.Draw the termination compensating wire, and be potted in the metal cap 10 with epoxy resin 7.Constitute metal jacket pipe electric thermo-couple temperature flowmeter sensor.
The SR10002 digital display industry registering instrument of optional this Yokogawa another day of dropping point analyzer company; This registering instrument class of accuracy is 0.2 grade; The indicating value limits of error of 0～400 ℃ of measurement range are ± 0.8 ℃ (actual measurement be to the maximum ± 0.2 ℃), and its error of measuring can revise through the program of instrument itself, and it is zero promptly can use sufficiently high standard to calibrate making its error; Higher than the accuracy of dropping point glass-stem thermometer; Can realize also that simultaneously numeral shows and record, can be intuitively in the drop point test process, record data objectively, improve the reliability and the objectivity of instrument.
Comparative measurements and the dropping point contrast test and the comparative test result of the industrial platinum resistance thermometer sensor, thermometer of above-mentioned four embodiment and thermocouple thermometer temperature-sensitive degree thermal response time of sensor are seen table 1, table 2, table 3.
The result of table 1 temperature sensor thermal response time
Show from table 1 comparative test result, industrial platinum resistance thermometer sensor, thermometer sensor, no matter slow heat test or anxious heat test, its thermal response time is all long than glass-stem thermometer, delays the heat test time near glass-stem thermometer, but relatively poor during anxious heat test; In the thermal response time test, no matter delay heat test or anxious heat test, have only metal-coating and quartzy overcoat thermocouple thermometer just can reach the thermal response time of the special-purpose mercury thermometer of dropping point; Adopt the electric thermo-couple temperature flowmeter sensor of quartz socket tube, in slow heat test, more special-purpose mercury thermometer can be measured hot junction portion temperature sooner, and the closed-end silver bullion is difficult for oxidation.When contacting, can reach synchronous with silicone oil with silicone oil.
The drop point test that quartz ampoule overcoat industry platinum resistance thermometer sensor, thermometer is measured, metal tube overcoat industry platinum resistance thermometer sensor, thermometer drop point test, furnace temperature has differed about 5 ℃ with test tube inside; The test findings that metal-coating thermocouple thermometer and quartz glass tube overcoat thermocouple thermometer drop point test and glass-stem thermometer are measured is more identical, and the experimental result favorable reproducibility can be used as drop point test and selects index for use with sensor; Adopt the thermocouple thermometer of metal sleeve; No matter delay heat test or anxious heat test; Its thermal response time is all short than mercury thermometer, but since metal-coating in the silicone oil medium, conduct heat too fast, cause because of silicone oil heat conduction when the low temperature relatively poor; Its elsewhere is low and make the measurement result distortion under the hot junction place temperature more same degree of depth, simultaneously the silver bullion of end contact for a long time silicone oil be prone to oxidation and cause measure inaccurate.
The comparison test of table 2 grease dropping point
Continuous 22 test figures of the same sample of table 3
Dropping point analyzer temperature test system compares to 5 kinds of different railway grease respectively with glass-stem thermometer and tests and continuous 22 tests of same sample.Concrete data are seen table 2, table 3.According to the regulation of GB/T3498, same operator uses same instrument; Under the operating conditions of regulation; Poor to the continuous test findings of same sample only once surpasses 14 ℃ (222～276 ℃ of dropping point temperature ranges) in 20 times, and then test findings thinks effective.The regulation of GB/T4929, to same sample replication, the difference of two times result is no more than 7 ℃ to same operator on same instrument, and then test findings thinks effective.
Uncertainty of measurement relatively see table 4
The dropping point analyzer shows the dropping point temperature by petroleum products with glass liquid thermometer and dropping point temperature test system respectively, and it is carried out evaluation of uncertainty in measurement respectively.It is 4.0 ℃ that petroleum products uses the expanded uncertainty of glass-stem thermometer; The expanded uncertainty of dropping point temperature test system is 1.0 ℃; This explanation temperature test system shows that the uncertainty of measurement (measured value is dispersed) of dropping point temperature obviously is superior to petroleum products and uses glass liquid thermometer, evaluates out expanded uncertainty such as following table 4.
Table 4 measurement result expanded uncertainty table
Claims (5)
1. lubricating grease dropping point temperature measuring sensor; Has an electric thermo-couple temperature flowmeter sensor that has the temperature-sensitive piece; And the outer tube of external diameter Φ >=5mm is characterized in that, the thermometric end at the temperature feeling ball position is filled with deeply >=and the metal temperature-sensitive piece of 5mm; The metal cap center pit gos deep into the said outer tube thermocouple thermometer of diameter of phi 1mm from the end, and is through in the above-mentioned temperature-sensitive piece diameter of phi 1mm hole; Constitute end body contact type, embedding has the metal cap of epoxy resin to draw the termination compensating wire.
2. according to the described lubricating grease dropping point temperature measuring sensor of claim 1, it is characterized in that described temperature-sensitive piece is red copper piece or fine silver piece, its cylindricality diameter is Φ 3mm, and the degree of depth is 5～6mm.
3. according to the described lubricating grease dropping point temperature measuring sensor of claim 1, it is characterized in that described outer tube is quartz glass tube or metal tube.
4. according to the described lubricating grease dropping point temperature measuring sensor of claim 3, it is characterized in that the measuring junction of said thermocouple thermometer is contained in the metal temperature-sensitive piece, thereby constitute quartz glass tube overcoat or metal tube overcoat electric thermo-couple temperature flowmeter sensor.
5. according to the described lubricating grease dropping point temperature measuring sensor of claim 3, it is characterized in that wherein, said thermocouple thermometer is an E calibration armored thermocouple thermometer, constitute quartz glass tube overcoat thermocouple thermometer or metal tube overcoat thermocouple thermometer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008101480388A CN101487804B (en) | 2008-12-26 | 2008-12-26 | Lubricating grease dropping point temperature measuring sensor |
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| CN2008101480388A CN101487804B (en) | 2008-12-26 | 2008-12-26 | Lubricating grease dropping point temperature measuring sensor |
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| CN101487804A CN101487804A (en) | 2009-07-22 |
| CN101487804B true CN101487804B (en) | 2012-01-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103033280A (en) * | 2012-12-18 | 2013-04-10 | 杨晶 | High-sensitivity thermal-response platinum resistor temperature sensor |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101793848B (en) * | 2010-01-19 | 2011-08-17 | 天津大学 | Method for measuring lubricating grease drop point |
| CN108007595B (en) * | 2017-11-21 | 2020-01-14 | 西北工业大学 | Probe type film thermocouple temperature sensor and manufacturing method thereof |
| CN110687159B (en) * | 2019-09-12 | 2022-06-10 | 无锡江南计算技术研究所 | Thermal resistance measuring device and method for thermal grease |
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- 2008-12-26 CN CN2008101480388A patent/CN101487804B/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103033280A (en) * | 2012-12-18 | 2013-04-10 | 杨晶 | High-sensitivity thermal-response platinum resistor temperature sensor |
| CN103033280B (en) * | 2012-12-18 | 2015-01-14 | 杨晶 | High-sensitivity thermal-response platinum resistor temperature sensor |
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