CN101487804A - Lubricating grease dropping point temperature measuring sensor - Google Patents
Lubricating grease dropping point temperature measuring sensor Download PDFInfo
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- CN101487804A CN101487804A CNA2008101480388A CN200810148038A CN101487804A CN 101487804 A CN101487804 A CN 101487804A CN A2008101480388 A CNA2008101480388 A CN A2008101480388A CN 200810148038 A CN200810148038 A CN 200810148038A CN 101487804 A CN101487804 A CN 101487804A
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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 a kind of dropping point analyzer dropping point temperature test system that meets standard GB/T3498, GB/T4929, the temperature probe that grease dropping point is measured, this sensor shows the grease dropping point temperature by the dropping point analyzer.
Background technology
At present, by measuring in 300 ℃, the oil-bath type dropping point analyzer that meets the railway grease of standard GB/T4929, or by measuring more than 300 ℃, meeting the temperature probe that the grease dropping point of aluminium stove piece formula drop point test instrument of the railway grease of 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 carry out drop point test, the reading of dropping point temperature shows 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, but because petroleum products is bigger with the scale division value and the error of glass-stem thermometer, the experimenter easily produces interpolation in reading process, temperature range more than 300 ℃ is traced to the source and is measured and passes difficulty simultaneously, must there be salt bath or molten tin bath that the temperature field 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 industry platinum resistance thermometer sensor, thermometer temperature is little, the precision height generally adopts in precision measurement, but because industrial 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 at prior art dropping point glass-stem thermometer displays temperature above shortcomings part, 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 object of the present invention is achieved 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 the thermocouple thermometer that diameter is at least Φ 1mm gos deep into the described outer tube from end metal cap center pit, 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 in the past petroleum products thermometer.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 order of 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, test accuracy and accuracy have further been improved, realize that simulation is shown to the transformation that numeral shows and writes down, and be convenient to metrological confirmation.Quartzy 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 end sealing 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 by welding and testee or temperature sensor, reduces heat and transmits resistance, and indicating value is stable.So can select for use quartzy outer tube thermocouple thermometer to substitute the dropping point glass-stem thermometer.The dropping point sensor when fusing its end with the railway grease contact condition with rules in the mercury thermometer end should be in full accord with the railway grease contact condition, its thermometric end shape is steeped shape with the dropping point thermometer temperature sensing, big or small unanimity has guaranteed railway grease surface of contact unanimity; 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 the shown temperature of instrument combine 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 ℃, meets the requirement of standard GB/T4929 and GB/T3498 simultaneously.
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
Below, the present invention is further described in conjunction with the accompanying drawings and embodiments.
Fig. 1 is the structure skeleton view of lubricating grease dropping point temperature measuring sensor first embodiment of the present invention.
Fig. 2 is the structure skeleton view of lubricating grease dropping point temperature measuring sensor second embodiment of the present invention.
Fig. 3 is the structure skeleton view of lubricating grease dropping point temperature measuring sensor the 3rd embodiment of the present invention.
Fig. 4 is the structure skeleton view of lubricating grease dropping point temperature measuring sensor the 4th embodiment of the present invention.
Among the figure: 1. resistive element, 2. temperature-sensitive piece, 3. outer tube, 4 apertures, 5 magnesia powders, 6 porcelain knobs, 7. epoxy resin, 8 leads, 9. outer tube thermocouple thermometer, 10. metal cap.
Embodiment
Fig. 1 has described and can connect digital display industry registering instrument by connecting lead 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 the outer tube thermocouple thermometer 9 of external diameter 〉=Φ 5mm, 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 piece or fine silver piece, and its cylindricality diameter is Φ 3mm, and the degree of depth is 3.5～6mm.Temperature-sensitive piece 2 central authorities are shaped on dark 5mm, 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, size is consistent.Be at least the thermocouple thermometer of Φ 1mm outward through size, go deep into to outer tube 3 from end metal cap 10 center pits, and be through in the diameter of phi 1mm aperture 4 of above-mentioned temperature-sensitive piece 2.Outer tube 3 constitutes end body contact type with above-mentioned metal cap 10, draws the termination compensating wire, and is 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 be a quartz glass tube, can also be metal tube.
In the embodiment shown in fig. 1, outer tube 3 is a quartz ampoule, wall thickness 1mm.Temperature-sensitive piece 2 is Φ 3 * 3.5～6 red copper pieces or fine silver piece.The hole dimension of temperature-sensitive piece 2 central small hole 4 can be a diameter of phi 2.1, the dribbling face cylindrical body of dark 5mm.Temperature-sensitive piece 2 is fixedly connected with hollow porcelain knob 6, is convenient to conduct heat by pouring in this hollow porcelain knob 6 and fills up the magnesia powder 5 of air pocket.The magnesia powder 5 of filling is with resistive element 1 and 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 the exit of metal cap 10, be connected into three-way lead-out mode with the compensating wire of thermometer, thereby constitute quartz ampoule overcoat industry platinum resistance thermometer sensor, thermometer sensor.
In embodiment illustrated in fig. 2, on the basis of the foregoing description 1, change described 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 of Φ 2.8mm porcelain knob 6, put into magnesia powder 5 fixed resistive element 1 and connect lead 8, fill up air pocket.Be potted in the metal cap 10 with epoxy resin 7 at last.To constitute metal tube overcoat industry platinum resistance thermometer sensor, thermometer sensor.
In the embodiment shown in fig. 3, on the basis of the foregoing description 1, lay red copper piece or the fine silver piece temperature-sensitive piece 2 of Φ 3 * 3.5～6mm in the quartz ampoule outer tube 3 with wall thickness 1mm.Mider hole size Φ 2.1, dark 5mm.And will be outward through being of a size of the E calibration armored thermocouple thermometer of Φ 1mm, an end is through in the Φ 1mm hole of temperature-sensitive piece 2, and an end stretches out from metal cap 10, and footpath between fields is welded in the quartz ampoule outer tube 3.Epoxy resin 7 is potted in the metal cap 10, makes end body contact type, draw the termination compensating wire, thereby constitute quartz ampoule overcoat electric thermo-couple temperature flowmeter sensor.
Embodiment 4
In the embodiment shown in fig. 4, on the basis of the foregoing description 1, change described outer tube 3 into metal tube, metal tube external diameter Φ 5, wall thickness 1mm.Temperature-sensitive piece 2 is Φ 5 * 3.5～6 red copper pieces or fine silver piece.E calibration armored thermocouple thermometer one end is through in the temperature-sensitive piece 2 Φ 1mm holes, and an end stretches out from metal cap 10, makes end body contact type.Draw the termination compensating wire, and be potted in the metal cap 10 with epoxy resin 7.Constitute the metal-coating thermocouple thermometer.
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 be revised by the program of instrument itself, can calibrate promptly that to make its error be zero with sufficiently high standard, than dropping point glass-stem thermometer accuracy height, can realize also simultaneously that numeral shows and record, can be directly perceived 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 see 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 end sealing 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 quartzy 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 thermometer of metal sleeve, no matter delay heat test or anxious heat test, its thermal response time is all short than mercury thermometer, but because metal-coating conducts heat too fast in the silicone oil medium, 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 the easy oxidation of silicone oil for a long time and cause measure inaccurate.
The comparison test of table 2 grease dropping point
Continuous 22 test figures of the same sample of table 3
| The title of railway grease | Batch | Quartz ampoule overcoat thermocouple thermometer ℃ | Thermometer ℃ |
| 7016 high low temperature greases | 061213026 | 277、276、275、277、278、 275、277、277、279、277、 276、276、276、276、278、 279、276、278、276、276、 277、276 | 273、271、279、278、275、 273、269、281、277、276、 271、272、、283、283、283、 277、280、271、278、277、 279、278 |
| Mean value | 277 | 277 | |
| Maximum |
2 | 8 | |
| Experimental standard deviation | 1.155 | 4.259 | |
| The experimental standard deviation of arithmetic mean | 0.246 | 0.908 |
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 see 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.Petroleum products is 4.0 ℃ with 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 dispersiveness) of dropping point temperature obviously is better than the petroleum products glass liquid thermometer, assesses expanded uncertainty such as following table 4.
Table 4 measurement result expanded uncertainty table
Claims (6)
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, it is characterized in that, thermometric end at the temperature feeling ball position is filled with deeply 〉=the metal temperature-sensitive piece of 5mm, the thermocouple thermometer that diameter is at least Φ 1mm gos deep into the described outer tube from end metal cap center pit, 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. by the described grease dropping point 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 3.5～6mm.
3. by the described grease dropping point sensor of claim 1, it is characterized in that described outer tube is quartz glass tube or metal tube.
4. by the described grease dropping point sensor of claim 1, it is characterized in that described thermocouple thermometer is industrial platinum resistance thermometer sensor, thermometer sensor.
5. by the described grease dropping point sensor of any one claim of claim 1 to 4, it is characterized in that, be fixedly connected with the hollow porcelain knob in the rear end of described temperature-sensitive piece, be filled with fixed resistive element and the magnesia powder that is connected lead in this hollow porcelain knob, the two connection leads that draw that connect resistive element are through in two apertures of porcelain knob, and draw from the exit of metal cap, be connected into three-way lead-out mode with the compensating wire of thermometer, thereby constitute quartz ampoule overcoat industry platinum resistance thermometer sensor, thermometer sensor or metal tube overcoat industry platinum resistance thermometer sensor, thermometer sensor.
6. by claim 1 or 2 or 3 described grease dropping point sensors, it is characterized in that wherein, described sensor is an E calibration armored thermocouple thermometer, thereby constitute quartz ampoule overcoat electric thermo-couple temperature flowmeter sensor or metal-coating 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 true CN101487804A (en) | 2009-07-22 |
| CN101487804B CN101487804B (en) | 2012-01-11 |
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Cited By (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 |
| CN108007595A (en) * | 2017-11-21 | 2018-05-08 | 西北工业大学 | A kind of sonde-type thin-film thermocouple temperature sensor and preparation method thereof |
| CN110687159A (en) * | 2019-09-12 | 2020-01-14 | 无锡江南计算技术研究所 | Thermal resistance measuring device and method for thermal grease |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103033280B (en) * | 2012-12-18 | 2015-01-14 | 杨晶 | High-sensitivity thermal-response platinum resistor temperature sensor |
-
2008
- 2008-12-26 CN CN2008101480388A patent/CN101487804B/en active Active
Cited By (4)
| 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 |
| CN108007595A (en) * | 2017-11-21 | 2018-05-08 | 西北工业大学 | A kind of sonde-type thin-film thermocouple temperature sensor and preparation method thereof |
| CN110687159A (en) * | 2019-09-12 | 2020-01-14 | 无锡江南计算技术研究所 | Thermal resistance measuring device and method for thermal grease |
| 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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Inventor after: Xiang Qiao Inventor after: He Yong Inventor after: Li Yong Inventor after: Liu Xudong Inventor before: Li Yong Inventor before: Liu Xudong |
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