CN201885817U - High-precision temperature-sensing probe - Google Patents
High-precision temperature-sensing probe Download PDFInfo
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- CN201885817U CN201885817U CN201020663622XU CN201020663622U CN201885817U CN 201885817 U CN201885817 U CN 201885817U CN 201020663622X U CN201020663622X U CN 201020663622XU CN 201020663622 U CN201020663622 U CN 201020663622U CN 201885817 U CN201885817 U CN 201885817U
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- temperature
- probe
- sensing
- high precision
- protective casing
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Abstract
The utility model discloses a high-precision temperature-sensing probe, which comprises a temperature-sensing wire of a probe part, a lead and a protecting sleeve pipe, wherein the lead is connected with the temperature-sensing wire and used for transferring an electrical signal, a probe protecting layer is arranged outside the temperature-sensing wire of the probe part, and a temperature-sensing material is filled between the temperature-sensing wire and the probe protecting layer; the lead penetrates through the inside of the protecting sleeve pipe; and the probe protecting layer and the protecting sleeve pipe are connected through a sealing ring. In the utility model, by adopting a novel packaging and isolating technology, the temperature-sensing delay caused by the protecting sleeve pipe and a packaging material is eliminated, the heat-transfer interference for a temperature-sensing device by the environmental temperature is blocked, the probe can be ensured to be only acted by the temperature field of fluid to be measured, the measured temperature of the probe is the current accurate temperature of the fluid to be measured, the temperature-measuring precision is high, and the reaction speed is high. The technology is particularly applicable to occasions with rapid changes of the temperature-measuring precision and the fluid temperature, such as the temperature measurement for the fluid in a line cavity and circulating fluid.
Description
Technical field
The utility model relates to temperature Detection Techniques field, particularly is applicable to a kind of high precision temperature-sensing probe of the thermometric demand that temperature measurement accuracy height, fluid temperature variations are fast.
Background technology
Temperature is the physical quantity of expression object cold and hot degree, is one of the most general in commercial production and the scientific experiment, most important thermal parameter.Measuring temperature methods has the branch of contact type measurement and non-contact measurement.Contact type measurement is to select a certain medium to contact with testee, and the heat interchange of going forward side by side is when both reach thermal equilibrium state, related physical quantity by the measuring media (volume of liquid for example, the thermoelectrical potential of thermopair, resistance of conductor etc.), obtain the physical index of testee.Promptly be mainly probe in the temperature Detection Techniques and utilize in the technical field, the probe form mainly contains: expansion class, resistance class, thermoelectric class, colour developing class etc., particularly resistance class have very widely to be used.
At this important and general parameter of temperature, people have done many explorations and innovation, but several factors is restricting the accuracy that temperature is surveyed, for example: the metal temperature-sensing probe of tradition probe partly is embedded in protective casing inside and does not directly contact with the external world, some ambient temperatures during signal transmits are in addition disturbed, and unavoidable meeting produces certain measuring errors; And protective casing and thermometric medium temperature are often inconsistent, and protective casing will dispel the heat under action of thermal difference or absorb heat, thereby have caused the time-delay of measuring, and detection process is slow in reacting; In the selection of material; shell material must satisfy certain rigidity; sealing; condition such as corrosion-resistant; because the material self character, protective casing is not easy to realize being connected with temperature-sensing probe, and it is more fastidious with the material of sleeve pipe to connect probe; it needs coefficient of heat conductivity little, and cohesiveness also will satisfy technological requirements such as anti-fracture.
In many engineerings field, temperature survey there is higher requirement, for example in earth source heat pump soil thermal response test, underground buried tube is imported and exported the coolant-temperature gage difference may be lower than 2K, use traditional temperature probe this moment, precision is generally about ± 1K, this under many circumstances temp probe can accurately not measured the import and export water temperature difference, so this temperature probe can not satisfy measurement requirement.A lot of engineerings field in addition also exists similar situation, so be badly in need of a kind of accurate and cheap temperature probe.
The utility model content
The purpose of this utility model provides a kind of high precision temperature-sensing probe; it is by the heat transfer link between isolation method cut-out temperature-sensing probe and the protective casing; temperature sensing device is directly contacted with the thermometric medium; and the interference source during simultaneously blocking signal transmits, solve the problem that thermal insulation casing in the present temperature Detection Techniques influences temperature measurement accuracy.
In order to achieve the above object, the utility model has been done further analysis to problems of the prior art: the measurement of fluid temperature (F.T.) in the pipeline is the problem that often runs in the thermal measurement, for example measurement of coolant-temperature gage in the pipeline.As figure is the measurement mechanism synoptic diagram, and flowing through temperature in pipeline is t
gFluid, the pipeline environment temperature is t
2If,
, just have heat outwards to derive, conductive heat loss that Here it is along felt piece.Owing to have conductive heat loss, the temperature t of felt piece
2Than fluid temperature (F.T.) t
gHang down, promptly produced conduction error t
2-t
G(because the diameter of protective casing or temperature tube is little, can suppose that the temperature of felt piece and protective casing outside it or temperature tube is consistent, all be t
g).According to heat transfer principle, the relational expression that can obtain conduction error is
Wherein
α 1 in the formula, and α 2--is respectively the inside and outside medium of pipe to the coefficient of heat emission between the temperature tube;
λ 1, and λ 2--is respectively the thermal conductivity of the inside and outside two ends of pipe temperature tube;
U1, U2--are respectively the perimeter of section of L1 and two sections temperature tubes of L2;
L1, L2--are respectively the length of the inside and outside temperature tube of pipe.
From following formula as seen:
1) under the influence that temperature tube outwards dispels the heat or absorbs heat from the external world, temperature survey will have certain systematic error;
2) ducted fluid and the temperature difference t that manages outer medium
G-t
2Big more, temperature measurement error is bigger.As calculated, when medium temperature was 10 ℃ outside fluid temperature (F.T.) is 5 ℃ of pipes, temperature measurement error was 0.089 ℃; When fluid temperature (F.T.) is 5 ℃, manage outer medium temperature when being 20 ℃, temperature measurement error is 0.311 ℃; When medium temperature was 30 ℃ outside fluid temperature (F.T.) is 5 ℃ of pipes, temperature measurement error was 0.533 ℃; When medium temperature was 50 ℃ outside fluid temperature (F.T.) is 5 ℃ of pipes, temperature measurement error was 0.755 ℃.As seen temperature measurement error is along with fluid in the pipeline increases with the increase of the outer medium temperature difference of pipe, if temperature sensing device is not to stick on the protective casing, this error will not exist.
In sum, so the technical scheme that the utility model is taked is: a kind of high precision temperature-sensing probe, the temperature-sensitive silk that comprises probe segment, the lead that is connected, is used to transmit electric signal with the temperature-sensitive silk, protective casing, temperature-sensitive silk outside is provided with the probe protective seam, is provided with the temperature-sensitive packing material between temperature-sensitive silk and the probe protective seam; Lead passes protective casing inside, is provided with the conducting wire heat insulating packing material between lead and the protective casing; Be connected by O-ring seal between probe protective seam and the protective casing.
As an improvement of the present utility model, in a kind of high precision temperature-sensing probe, the lead periphery is provided with the insulation protection internal layer, in order to insulating protection between adjacent wires and signal interference eliminated.
As another improvement of the present utility model, in a kind of high precision temperature-sensing probe, also be provided with the insulation protection skin between protective casing and the insulation protection internal layer.In order to insulating protection between lead and the protective casing and signal interference eliminated.
As a kind of preferred embodiment, between the high precision temperature-sensing probe of the present utility model, its protective casing and O-ring seal for being threaded.Protective casing can adopt the material with certain degree of hardness, sealing, corrosion resistance, as stainless steel sleeve pipe, copper pipe etc., also can adopt nonmetallic materials, with the purpose that reaches protection and be convenient to install.
As a kind of preferred embodiment, high precision temperature-sensing probe of the present utility model is connected for silica adhesive between its probe protective seam and O-ring seal.Described O-ring seal will reach requirements such as intact heat insulation, sealing, cohesiveness, guarantees the isolation of ambient temperature and interior metal conductor.
As a kind of preferred embodiment; high precision temperature-sensing probe of the present utility model; its conducting wire heat insulating packing material is a polyurethane material; slit between insulation protection skin and the protective casing is all filled up; also can select other that good thermal insulation is arranged, and the conducting wire heat insulating packing material of the position of fixing cord preferably.
As a kind of preferred embodiment, high precision temperature-sensing probe of the present utility model, its temperature-sensitive packing material is for there being certain mechanical strength, and ratio of specific heat is less, the stupalith that coefficient of heat conductivity is bigger, it not only is used for the temperature-sensitive silk is fixed, temperature with measurement point passes to the temperature sensing metal silk rapidly simultaneously, also can select for use other that certain mechanical strength is arranged, and ratio of specific heat is less, coefficient of heat conductivity is bigger, can transmit the material of heat fast.
The beneficial effects of the utility model are: temperature-sensitive silk, probe protective seam and temperature-sensitive packing material constitute temperature-sensing probe jointly, experience temperature and temperature inversion is become corresponding electric signal; Protective casing and conducting wire heat insulating packing material guardwire avoid ambient temperature to disturb, and lead is a signal transduction component simultaneously, electric signal is transferred to the equipment of signal resolution corresponding function.
In room temperature about 21 ℃, guaranteeing that two probes measuring point in test process is very approaching, simultaneously on the basis that probe can not be in contact with one another, based on principle: the time that needs during respectively from a kind of state of temperature to another kind of steady state (SS) by two probes and the variation tendency of temperature curve can be judged sensitivity, phase one is put into the approximate stable state warm water (water temperature probably is 37.4 ℃) that reaches from air simultaneously with temperature-sensing probe of the present utility model and ordinary ultrasonic probe, it is basicly stable to treat that probe temperature shows, subordinate phase is promptly taken out probe and is used cloth to wipe with rapidly and wipes away drying from warm water, treat that again its temperature reaches stable again, test this two times that stages two probe experiences separately.Multi-group data shows that temperature-sensing probe of the present utility model has quite superior high sensitivity characteristic, and protective casing reduces greatly to the Temperature Influence of temperature sensing device impression, and the temperature that temperature-sensing probe is surveyed directly is the actual temperature of tested point.
Description of drawings
Fig. 1 is a high precision temperature-sensing probe structural representation of the present utility model;
The phase one temperature response curve that Fig. 2 obtains for contrast test;
The subordinate phase temperature response curve that Fig. 3 obtains for contrast test.
Embodiment
For content of the present utility model is become apparent more, technical scheme is described further below in conjunction with the drawings and specific embodiments.
In conjunction with shown in Figure 1, high precision temperature-sensing probe of the present utility model comprises the temperature-sensitive silk 1 of probe segment, be connected, be used to transmit the lead 3 of electric signal with the temperature-sensitive silk, protective casing 2, probe segment also comprise probe protective seam 4, and temperature-sensitive silk 1 is positioned at probe protective seam 4, be provided with temperature-sensitive packing material 9 between temperature-sensitive silk 1 and the probe protective seam 4, temperature-sensitive packing material 9 is for there being certain mechanical strength, and ratio of specific heat is less, the stupalith that coefficient of heat conductivity is bigger; Lead 3 passes protective casing 2 inside, lead 3 peripheries are provided with insulation protection internal layer 7, also be provided with insulation protection skin 6 between protective casing 2 and the insulation protection internal layer 7, outer 6 of protective casing 2 and insulation protection are provided with conducting wire heat insulating packing material 8, conducting wire heat insulating packing material 8 is a polyurethane material, and it all fills up the slit between insulation protection outer 6 and the protective casing 2; Probe protective seam 4 and protective casing 2 are connected by O-ring seal 5, for being threaded, are connected for silica adhesive between pop one's head in protective seam 4 and the O-ring seal 5 between protective casing 2 and the O-ring seal 5.
Temperature-sensitive silk 1, probe protective seam 4 and temperature-sensitive packing material 9 common formation probe segments are experienced temperature and temperature inversion are become corresponding electric signal; Protective casing 2 and conducting wire heat insulating packing material guardwire 3 are avoided being subjected to ambient temperature and are disturbed; Lead 3 is transferred to electric signal the equipment of signal resolution corresponding function.
In conjunction with the temperature curve that Figure 2 shows that high precision temperature-sensing probe of the present utility model and ordinary ultrasonic probe contrast experiment phase one draw, according to tracing analysis as can be seen, flex point when A, B represent 2 positions during two probes are from the air to water when beginning to heat up, clearly the A point will shift to an earlier date 2-3 second than the B point, and temperature-sensing probe promptly of the present utility model reacts fast 2-3 second than the tradition probe.2 of C, D represent that respectively two probes begin stable point (this moment, temperature value and final stablizing were to differ 5%) in warm water, as seen the C point is than the fast 17-25 of D point second, temperature-sensing probe promptly of the present utility model than the tradition probe in advance 17-25 reach thermometric stable second promptly being quick on the draw property be better.
In conjunction with the temperature curve that Figure 3 shows that high precision temperature-sensing probe of the present utility model and ordinary ultrasonic probe contrast experiment subordinate phase draw, according to tracing analysis as can be seen, after from water, taking out, the rate of temperature change of incipient stage temperature-sensing probe of the present utility model is bigger in air, the stable point A that has reached temperature early.As can be seen from Figure, the A temperature of ordering will shift to an earlier date 300-310 second than an original probe B that tends towards stability.The superiority of high precision temperature-sensing probe as seen of the present utility model is more obvious.
Concrete case study on implementation only is a preferable case study on implementation of the present utility model described in the utility model, is not to be used for limiting practical range of the present utility model.Be that all equivalences of doing according to the content of the utility model claim change and modification, all should be as technology category of the present utility model.
Claims (8)
1. high precision temperature-sensing probe, the temperature-sensitive silk that comprises probe segment, the lead that is connected, is used to transmit electric signal with the temperature-sensitive silk, protective casing, it is characterized in that, probe segment also comprises probe protective seam (4), and the temperature-sensitive silk is positioned at the probe protective seam, is provided with temperature-sensitive packing material (9) between temperature-sensitive silk (1) and the probe protective seam (4); Lead passes protective casing inside, is provided with conducting wire heat insulating packing material (8) between lead and the protective casing; Be connected by O-ring seal between probe protective seam and the protective casing.
2. high precision temperature-sensing probe according to claim 1 is characterized in that, lead (3) periphery is provided with insulation protection internal layer (7).
3. high precision temperature-sensing probe according to claim 2 is characterized in that, also is provided with insulation protection skin (6) between protective casing (2) and the insulation protection internal layer (7).
4. according to the high precision temperature-sensing probe under the claim 3, it is characterized in that conducting wire heat insulating packing material (8) is located between protective casing (2) and the insulation protection skin (6).
5. high precision temperature-sensing probe according to claim 1 and 2 is characterized in that, between protective casing (2) and the O-ring seal (5) for being threaded.
6. high precision temperature-sensing probe according to claim 1 and 2 is characterized in that, is connected for silica adhesive between probe protective seam (4) and the O-ring seal (5).
7. high precision temperature-sensing probe according to claim 4 is characterized in that, conducting wire heat insulating packing material (8) is a polyurethane material, and it all fills up the space between insulation protection skin (6) and the protective casing (2).
8. high precision temperature-sensing probe according to claim 1 and 2; it is characterized in that temperature-sensitive packing material (9) is for there being certain mechanical strength, and ratio of specific heat is less; the stupalith that coefficient of heat conductivity is bigger, it all fills up the space between temperature-sensitive silk (1) and the probe protective seam (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020663622XU CN201885817U (en) | 2010-12-16 | 2010-12-16 | High-precision temperature-sensing probe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020663622XU CN201885817U (en) | 2010-12-16 | 2010-12-16 | High-precision temperature-sensing probe |
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| CN201885817U true CN201885817U (en) | 2011-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201020663622XU Expired - Fee Related CN201885817U (en) | 2010-12-16 | 2010-12-16 | High-precision temperature-sensing probe |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102062642A (en) * | 2010-12-16 | 2011-05-18 | 东南大学 | High-precision temperature sensitive probe |
| CN104900128A (en) * | 2015-04-30 | 2015-09-09 | 宁波职业技术学院 | Humiture measuring experiment apparatus for teaching, and measuring system thereof |
-
2010
- 2010-12-16 CN CN201020663622XU patent/CN201885817U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102062642A (en) * | 2010-12-16 | 2011-05-18 | 东南大学 | High-precision temperature sensitive probe |
| CN102062642B (en) * | 2010-12-16 | 2013-06-26 | 东南大学 | High-precision temperature sensitive probe |
| CN104900128A (en) * | 2015-04-30 | 2015-09-09 | 宁波职业技术学院 | Humiture measuring experiment apparatus for teaching, and measuring system thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110629 Termination date: 20121216 |