CN2499812Y - Hydrophobic probe - Google Patents
Hydrophobic probe Download PDFInfo
- Publication number
- CN2499812Y CN2499812Y CN 01272240 CN01272240U CN2499812Y CN 2499812 Y CN2499812 Y CN 2499812Y CN 01272240 CN01272240 CN 01272240 CN 01272240 U CN01272240 U CN 01272240U CN 2499812 Y CN2499812 Y CN 2499812Y
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- CN
- China
- Prior art keywords
- temperature
- model
- thermal resistance
- utility
- thermal
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Fee Related
Links
- 239000000523 sample Substances 0.000 title claims abstract description 10
- 230000002209 hydrophobic effect Effects 0.000 title claims description 9
- 238000009413 insulation Methods 0.000 claims description 8
- 230000004044 response Effects 0.000 abstract description 10
- 239000002184 metal Substances 0.000 abstract description 4
- 239000012530 fluid Substances 0.000 abstract description 3
- 238000009529 body temperature measurement Methods 0.000 abstract 3
- 229930000044 secondary metabolite Natural products 0.000 abstract 1
- 238000000034 method Methods 0.000 description 19
- 238000010438 heat treatment Methods 0.000 description 5
- 238000013178 mathematical model Methods 0.000 description 5
- 230000001681 protective effect Effects 0.000 description 4
- 239000011810 insulating material Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000005855 radiation Effects 0.000 description 2
- 230000001235 sensitizing effect Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000005144 thermotropism Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Images
Abstract
The utility model relates to a drainage probe which belongs to a secondary compound overall metal shielding thermoelectric couple with a protection pipe and a thermal resistance, which can be used in the rapid temperature measurement of fluid medium on a pressure container and a pipeline under high temperature and high pressure (and the following parameters). The object of the utility model is to solve the problem of low response of the prior thermoelectric couple (thermal resistance) in the course of temperature measurement. The measures adopted in the utility model to improve the response speed are as follows: (1) the thermoelectric couple (or the thermal resistance) is in ladder-shape from the protection pipe to a temperature sensing end, which facilitates the diameter of the temperature sensing end to become smaller; (2) the top part of the temperature sensing end is in semi-sphere-shape; (3) the inner structure of the temperature sensing end has the protection pipe, a MgO insulating layer and a thermal couple thread; (4) a thermal element with relatively small size is selected. The utility model can be used in the rapid temperature measurement of fluid medium on the pressure container and the pipeline under high temperature and high pressure (and the following parameters) and acquires the rapid character of dynamic response time as Pi <0.5>=3 seconds.
Description
[technical field]
The utility model belongs to the compound full armoured thermocouple of band protection cast secondary, thermal resistance, and the fast temperature that can be used for carrying out on the pressure vessel of High Temperature High Pressure (and following parameter) and the pipeline fluid media (medium) is measured.
[background technology]
The thermopair of conventional belt protective casing (thermal resistance) is by protective casing and tape insulation material (porcelain bead; glass tube etc.) thermal element or armouring thermal element; terminal box parts such as (idol heads) is formed; the sensitizing range of its thermometric is (temperature-sensitive end) at its tip; the heat of measured medium passes to cannula tip earlier in the thermometric process; the end metal temperature is risen; and then through contact portion or clearance between sleeve pipe and the thermal element; insulators etc. pass to thermal element (hot junction); if the armouring thermal element also must heat the armour body earlier; pass to thermal element (hot junction) through insulation course then, in diabatic process, make diabatic process slack-off because of following reason:
1, protection tube and end volume thereof are big, thermal capacity is bigger, so temperature rise is slower.
2, protection tube can not directly contact with thermal element as requiring thermal element to insulate then, can only conduct heat by air-gap or insulation course, makes diabatic process slack-off.
3, as adopting the armouring thermal element, then often between armour body and the protection tube for some contact, loose contact sometimes even employing spring compression method also only makes a contact better slightly, but is not dealt with problems at all.
4, many thermopair (thermal resistance) thermal element sizes are bigger than normal, and especially thermal resistance makes thermal capacity own cause temperature variation slow greatly.
5, causing diabatic process to pass to internal layer from skin by the sandwich construction reason arrives inside at last, makes diabatic process become very slow.
Make thermopair (thermal resistance) low-response in the thermometric process of conventional belt protection tube by above reason.National standard weigh thermopair (thermal resistance) dynamic responding speed be its under step disturbance, variable quantity reaches 10%, 50% and 90% of end value, the time τ of experience
0.1, τ
0.5And τ
0.9, the τ of the assembled thermopair of general conventional belt protection tube
0.5Be about 60-120 about second.The τ of the thermopair (thermal resistance) of at present domestic best High Temperature High Pressure band protection tube
0.5Do not reach below 30 seconds yet.
[utility model content]
It is exactly the problem of thermopair (thermal resistance) low-response in the thermometric process that task of the present utility model will solve exactly.At first need the dynamic perfromance of thermopair (thermal resistance) of band protection tube is analyzed for this reason.
When carrying out temperature survey with thermopair (thermal resistance), the temperature variation of thermopair (temperature rise) is that this belongs to the heating process of an object owing to there is heat to flow from measured medium (thermal source) thermoelectric couple element.At heat source temperature is θ
1The time, the temperature θ of object
2Can be because of θ
1Variation and change, establish X=θ
1, Y=θ
2Then object is at model such as Fig. 1 of heating process.
This process is as input θ
1During for unit-step function, its output will be risen exponentially, see Fig. 2.As can be seen from Figure 2, the heating process of object is a first order inertial loop, and time T is for working as output θ
2The time of being experienced when rising to 0.632 times that stablizes output valve K it represent the size of this link inertia, be called inertia time constant.The transport function of this link is:
G (S)=K/ (TS+1) ... (1) the thermometric process of the general armoured thermocouple (thermal resistance) of band protection tube can be by being divided into three links to protection tube end metal (link 1) with from the cannula tip metal to armouring thermal element armour end of body (link 2) and from armour end of body thermotropism element end (thermojunction or resistance thermometer clement) (link 3) from measured medium; the dynamic perfromance of the thermometric process of these three links is respectively the one order inertia system also, establishes G
1(S), G
2(S), G
3(S) be respectively the transport function of link 1, link 2 and link 3, K
1, K
2, K
3Be respectively the gain of three links, T
1, T
2, T
3Be respectively the inertia time constant of three links, then the dynamic perfromance mathematical model of three links is respectively:
G
1(S)＝K
1/(T
1S+1) ......(2)
G
2(S)＝K
2/(T
2S+1) ......(3)
G
3(S)＝K
3/(T
3S+1) ......(4)
In the thermometric process, through link 1, link 2 and link 3 reach the thermal element sensitizing range to heat from the measured medium order, and therefore three links are connected.The transport function G of whole process (S) is the product of three link mathematical models, that is:
G(S)＝G
1(S)·G
2(S)·G
3(S)
＝K
1·K
2·K
3/(T
1S+1)(T
2S+1)(T
3S+1)
＝K/(T
1S+1)(T
2S+1)(T
3S+1) ......(5)
(5) in the formula, K=K
1K
2K
3, be the gain of total system, be that temperature is calculated by output Y, its value is 1 ℃/℃=1, calculates by being output as thermoelectrical potential, number by its thermoelectric each section of value curve calculating, its dimension is mV/ ℃ to its value according to the calibration of different thermopairs.The inertia time constant T of above-mentioned three links
1, T
2, T
3Determined the dynamic perfromance (being dynamic responding speed) of thermopair (thermal resistance) thermometric process, they can be respectively with the equivalent thermal resistance R in its diabatic process
1, R
2, R
3The approximate replacement,, in diabatic process, radiation, conduction and three kinds of modes of convection current are simultaneous often.In link 1, just there are three kinds of heat transfer types; Link 2 is based on radiation and conduction; Link 3 is then mainly conducted heat with heat exchange pattern, but for the ease of calculating, we all convert heat exchange pattern with various heat transfer types and promptly describe with equivalent thermal resistance.If the equivalent thermal resistance of three links is respectively R
1, R
2, R
3, when not considering axial heat conduction, the inertia time constant of three links can be expressed as follows respectively:
T
1＝R
1C
1 ......(6)
T
2＝R
2C
2 ......(7)
T
3＝R
3C
3 ......(8)
C in the formula
1, C
2, C
3Be respectively the thermal capacity of three link heat transfer target objects.From above analysis as can be known, the dynamic perfromance of thermopair (thermal resistance) the thermometric process of band protection tube belongs to three rank inertia systems, and the speed-rising characteristic under its step disturbance is seen Fig. 3.Fig. 3 is the speed-rising characteristic curve of the thermopair of a conventional belt protection tube, can find out obviously that from figure it has the characteristics of three rank inertial elements, has the pure section of a delaying τ and an equivalent volume time constant T
c, its approximate mathematical model is:
G(s)＝e
-τS·K/(T
c?S+1) ......(9)
According to above-mentioned (5) and (6), (7), (8) formula, can explain the dynamic perfromance of improving band protection tube thermopair (thermal resistance) theoretically, the measure that improves the response speed of its thermometric process must be to reduce T
1, T
2, T
3, that is to say the inertia time constant that must reduce three links, the following technical measures of taking at manufacture view are the Basic Ways that reduce the time constant of each link.
1) the protection tube end being made thinner right cylinder is in order to reduce thermal capacity C to reduce the end volume
1
2) select for use minor diameter armouring element can reduce thermal capacity C
2And C
3
3) increase sleeve pipe and even core element contact area, and to reduce the clearance be in order to reduce R as far as possible
2
4) adopt the high density insulating material to make the armouring element and can reduce R
3
5) in installing and using process, select measured medium flow regimes (avoiding flow dead), as in face of flowing to or the like, can reduce R
1
Static structure of the present utility model for this reason, i.e. the measure of the raising response speed taked of hydrophobic probe is:
A kind of hydrophobic probe, it is made up of protection tube, thermocouple wire and insulation course, it is characterized in that:
1, be stepped appearance from protection tube to the temperature-sensitive end, the diameter of temperature-sensitive end is reduced, and then its quality minimizing, thereby C reduced
1
2, the top of temperature-sensitive end is the hemisphere bodily form, to increase heat transfer area;
3, the inner structure of temperature-sensitive end is protection tube, MgO insulation course and thermocouple wire; soon two combine into one for the armour body of protective casing tip and armouring element; make the entire product dynamic mathematical models become second-order system, promptly cancelled, can be considered and cancelled C from the link of cannula tip to the heat transfer of armour end of body
2, and make R
2=0, therefore make T
2=0, MgO is the high density insulating material simultaneously, no clearance, and the heat conduction velocity that improves the armouring element is to reduce R
3
4, select undersized thermocouple wire, make C
3Thereby reduce to reduce T
3
At C
1And C
3Reduce cancellation C
2Situation under, reduce R significantly
3, hydrophobic probe has realized improving to greatest extent the purpose of the dynamic perfromance of the thermopair (thermal resistance) of being with protection tube on manufacturing process.
After taking above technical measures, hydrophobic probe has obtained dynamic response time τ
0.5≤ 3 seconds quick characteristic, compared with the prior art, the response time shortens greatly.
[description of drawings]
Further specify the utility model below in conjunction with accompanying drawing.
Fig. 1 is the heating illustraton of model of object.
Fig. 2 is the speed-rising characteristic figure of object heating process.
Fig. 3 is the speed-rising characteristic curve map of the thermopair of conventional belt protection tube.
Fig. 4 is a structural representation of the present utility model.
Fig. 5 is the complete section figure of Fig. 4 I portion.
[embodiment]
It is made up of protection tube 1, thermocouple wire 3 and MgO insulation course 2, it is characterized in that:
(1) 4 be stepped appearance from protection tube 1 to the temperature-sensitive end, the diameter of temperature-sensitive end is reduced, and then its quality reduces, thereby reduce C
1
(2), the top of temperature-sensitive end is the hemisphere bodily form, to increase heat transfer area;
(3), the inner structure of temperature-sensitive end is protection tube 1, MgO insulation course 2 and thermocouple wire 3; soon two combine into one for the armour body of protective casing tip and armouring element; make the entire product dynamic mathematical models become second-order system; promptly cancelled from the link of cannula tip, can be considered and cancelled C to the heat transfer of armour end of body
2, and make R
2=0, therefore make T
2=0, MgO is the high density insulating material simultaneously, no clearance, and the heat conduction velocity that improves the armouring element is to reduce R
3
(4), select undersized thermo wires or miniature thin-film thermal resistance, make C
3Thereby reduce to reduce T
3
At C
1And C
3Reduce cancellation C
2Situation under, reduce R significantly
3, hydrophobic probe has realized improving to greatest extent the purpose of the dynamic perfromance of the thermopair (thermal resistance) of being with protection tube on manufacturing process.After taking above technical measures, hydrophobic probe has obtained dynamic response time τ
0.5≤ 3 seconds quick characteristic.
Claims (1)
1, a kind of hydrophobic probe, it is made up of protection tube, thermocouple wire and insulation course, it is characterized in that:
(1) is stepped appearance from protection tube to the temperature-sensitive end, the diameter of temperature-sensitive end is reduced;
(2) top of temperature-sensitive end is the hemisphere bodily form;
(3) inner structure of temperature-sensitive end is protection tube, MgO insulation course and thermocouple wire;
(4) select undersized thermocouple wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01272240 CN2499812Y (en) | 2001-12-18 | 2001-12-18 | Hydrophobic probe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01272240 CN2499812Y (en) | 2001-12-18 | 2001-12-18 | Hydrophobic probe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2499812Y true CN2499812Y (en) | 2002-07-10 |
Family
ID=33677432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01272240 Expired - Fee Related CN2499812Y (en) | 2001-12-18 | 2001-12-18 | Hydrophobic probe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2499812Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108387320A (en) * | 2018-02-08 | 2018-08-10 | 北京航空航天大学 | A kind of permanent mold casting quick response temperature thermocouple |
| CN108414106A (en) * | 2018-02-08 | 2018-08-17 | 北京航空航天大学 | A kind of casting mould quick response temperature thermocouple |
-
2001
- 2001-12-18 CN CN 01272240 patent/CN2499812Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108387320A (en) * | 2018-02-08 | 2018-08-10 | 北京航空航天大学 | A kind of permanent mold casting quick response temperature thermocouple |
| CN108414106A (en) * | 2018-02-08 | 2018-08-17 | 北京航空航天大学 | A kind of casting mould quick response temperature thermocouple |
| CN108414106B (en) * | 2018-02-08 | 2019-07-12 | 北京航空航天大学 | A kind of casting mould quick response temperature thermocouple |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: LUAN WENJU Free format text: FORMER OWNER: YUGUANG TEMPERATURE CONTROL INSTRUMENT CO., LTD., SHENYANG Effective date: 20050121 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20050121 Address after: Fengle small street in Dongling District of Shenyang city in Liaoning province 110015 No. 15 Yuguang temperature control instrument company Patentee after: Luan Wenju Address before: Fengle small street in Dongling District of Shenyang city in Liaoning province 110015 No. 15 Yuguang temperature control instrument company Patentee before: YUGUANG TEMPERATURE CONTROL IN |
|
| C56 | Change in the name or address of the patentee |
Owner name: NO. 15, FENGYUEYI STREET, DONGLING DISTRICT, SHENY Free format text: FORMER NAME OR ADDRESS: LIAONING PROVINCE SHENYAN CITY DONGLING DISTRICT FENGLE XIAOYI STREET NO.15YUGUANG TEMPERATURE INSTRUMENT COMPANY |
|
| CP03 | Change of name, title or address |
Patentee address after: Liaoning Province in Dongling District of Shenyang City fengle Street No. 15 A Patentee address before: Fengle small street in Dongling District of Shenyang city of Liaoning province No. 15 Yuguang temperature control instrument company |
|
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |