CN102410971A - Method and special device for detecting flowing of fluid medium based on heat conductivity principle - Google Patents
Method and special device for detecting flowing of fluid medium based on heat conductivity principle Download PDFInfo
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- CN102410971A CN102410971A CN2011104008916A CN201110400891A CN102410971A CN 102410971 A CN102410971 A CN 102410971A CN 2011104008916 A CN2011104008916 A CN 2011104008916A CN 201110400891 A CN201110400891 A CN 201110400891A CN 102410971 A CN102410971 A CN 102410971A
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Abstract
The invention relates to a method and special device for detecting flowing of a fluid medium based on the heat conductivity principle, belonging to the technical field of electric transmission and transformation. According to the technical scheme, two adjustable resistors (R1and R2) are connected in series, and then, the two adjustable resistors are connected with two serially connected heat sensors (R3 and R4) in parallel to form a special circuit, and a power supply provides power for the special circuit; one of the two serially connected heat sensors is arranged in a fluid medium flowing region (1), and the other heat sensor is arranged in a fluid medium stable region (2); output ends (3 and 4) of a detection signal are respectively located between the two serially connected adjustable resistors and the two serially connected heat sensors; through regulation on the resistance values of the adjustable resistors, the dynamic response performance of fluid flowing is obtained according to the output detection signal. The linear performance measured by the special device only relates to the flow velocity of a fluid heat conduction medium, and is irrelative to the rate of flow and the installation position. The special device has wide adaptability, is convenient to use, simple and easy to operate and free from factors of mechanical wear and actual effect aging, and free of maintenance.
Description
Technical field
The present invention relates to a kind of method and isolated plant, be used to detect large-scale power transformer heat eliminating medium flow circuit situation, belong to the power transmission and transformation technical field based on thermal conduction principle test fluid media flow.
Background technology
For the power transformer that adopts water cycle or oil circulation to cool off, the flow condition of heat eliminating medium is unusual The key factor for the heat-sinking capability of cooling device.For the power transformer that adopts the ODAF type of cooling to cool off, only on the basis that heat eliminating medium circulates, refrigeratory just can provide specified cooling power.Usually, background technology adopts oil flow relay to carry out the detection of heat eliminating medium.When the transformer heat eliminating medium flowed, the mechanical valve plate that promotes oil flow relay rotated, and drives the rotation of pointer, carries out indication and signal transmission that heat eliminating medium flows.When heat eliminating medium flows when stopping, valve plate leans on the damping force of spring to return.When adopting this mechanical hook-up, need to consider several factors.For example, the nominal diameter matching relationship of the rated flow of oil pump and the flow of oil flow relay, couplet pipe, many factors such as mutual alignment of oil-out and oil flow relay.In addition, mounting means, tenure of use, mechanical wear (metal powder that mechanical wear produces is to the potential hazard of transformer) or the like factor is also extremely important, otherwise not only will cause the pointer shake of oil flow relay, even can cause the catastrophic failure of transformer.
Summary of the invention
The purpose of this invention is to provide a kind of method and isolated plant based on thermal conduction principle test fluid media flow, simple in structure, have adaptability widely, easy to use, the reliable row that is prone to solves the problems referred to above that background technology exists.
Technical scheme of the present invention is:
A kind of method based on thermal conduction principle test fluid media flow comprises following steps: 1. two adjustable resistance series connection, and the thermal sensor of connecting with two then parallel connection constitutes special circuit, and power supply is to this special circuit power supply; 2. the thermal sensor of two series connection; One of them is soaked in the fluid thermal conductive medium fully; And can be fully by the impact flow of fluid media (medium), another is soaked in the fluid thermal conductive medium fully, can experience the temperature variation of fluid cooling media fully; 3. the output terminal of detection signal lays respectively between two adjustable resistances of polyphone and between two thermal sensors of polyphone; 4. through the resistance of adjustment adjustable resistance, obtain the dynamic response performance that fluid flows according to the monitor signal of exporting.
Two thermal sensors are immersed in the fluid thermal conductive medium of same position completely, fully.
A kind of isolated plant based on thermal conduction principle test fluid media flow; Comprise two adjustable resistances, two thermal sensors, the mobile district of fluid media (medium)s and fluid media (medium) stable regions; Two adjustable resistance series connection; The thermal sensor parallel connection of connecting with two then constitutes special circuit, and power supply is to this special circuit power supply; The thermal sensor of two series connection; One of them is arranged on the mobile district of fluid media (medium); Be soaked in fully in the fluid thermal conductive medium, and can be fully by the impact flow of fluid media (medium), another is arranged on the fluid media (medium) stable region; Be soaked in fully in the fluid thermal conductive medium, can experience the temperature variation of fluid cooling media fully; The output terminal of detection signal lays respectively between two adjustable resistances of polyphone and between two thermal sensors of polyphone; Through the resistance of adjustment adjustable resistance, obtain the dynamic response performance that fluid flows according to the monitor signal of exporting.
Good effect of the present invention: the linear properties that the present invention measures is only relevant with the flowing velocity of fluid thermal conductive medium; And have nothing to do with flow, installation site, overcome the oil flow relay various shortcoming, have adaptability widely; And characteristics such as easy to use, simple; And, therefore, need not safeguard owing to do not have mechanical wear and the aging factor of actual effect.
Description of drawings
Fig. 1 is an embodiment of the invention synoptic diagram;
Among the figure: the flow output terminal 3 and 4 of district 1, fluid media (medium) stable region 2, detection signal of R1 adjustable resistance, R2 adjustable resistance, R3 thermal sensor, R4 thermal sensor, fluid media (medium).
Embodiment
Below in conjunction with accompanying drawing, the present invention is further specified through embodiment.
A kind of method based on thermal conduction principle test fluid media flow comprises following steps: 1. two adjustable resistance R1, R2 connect, and the thermal sensor R3 that connects with two then, R4 parallel connection constitute special circuit, and power supply is to this special circuit power supply; 2. the thermal sensor of two series connection; One of them is soaked in the fluid thermal conductive medium fully; And can be fully by the impact flow of fluid media (medium), another is soaked in the fluid thermal conductive medium fully, can experience the temperature variation of fluid cooling media fully; 3. the output terminal 3,4 of detection signal lays respectively between two adjustable resistances of polyphone and between two thermal sensors of polyphone; 4. through the resistance of adjustment adjustable resistance, obtain the dynamic response performance that fluid flows according to the monitor signal of exporting.
Two thermal sensor R3, R4 are immersed in the fluid thermal conductive medium of same position completely, fully.
A kind of isolated plant based on thermal conduction principle test fluid media flow; Comprise two adjustable resistances, two thermal sensors, the mobile district of fluid media (medium)s and fluid media (medium) stable regions; Two adjustable resistance R1, R2 connect; The thermal sensor R3 that connects with two then, R4 parallel connection constitute special circuit, and power supply is to this special circuit power supply; The thermal sensor of two series connection; One of them is arranged on the mobile district 1 of fluid media (medium); Be soaked in fully in the fluid thermal conductive medium, and can be fully by the impact flow of fluid media (medium), another is arranged on fluid media (medium) stable region 2; Be soaked in fully in the fluid thermal conductive medium, can experience the temperature variation of fluid cooling media fully; The output terminal 3,4 of detection signal lays respectively between two adjustable resistances of polyphone and between two thermal sensors of polyphone; Through the resistance of adjustment adjustable resistance, obtain the dynamic response performance that fluid flows according to the monitor signal of exporting.
Thermal sensor R3 is soaked in the fluid thermal conductive medium fully, and can be fully by the impact flow of fluid media (medium).Thermal sensor R4 also is soaked in the fluid thermal conductive medium fully, can experiences the temperature variation of fluid cooling media fully.For the application that makes this method does not receive the influence of environment temperature, need be immersed in two thermal sensor R3, R4 completely, fully in the fluid thermal conductive medium of same position.In addition; This method in order to adapt to fluid media (medium) because the situation that the variation viscosity of environment temperature changes; Two adjustable resistance R1, R2 have been adopted; With the sensitivity that guarantees that this method is measured for viscous medium, the resistance through adjustment adjustable resistance R1, R2 reaches the purpose that this method is used to measure the mobile dynamic response performance of fluid.
Claims (3)
1. method based on thermal conduction principle test fluid media flow; It is characterized in that comprising following steps: 1. two adjustable resistances (R1, R2) series connection; With two thermal sensors of connecting (R3, R4) parallel connection, constitute special circuit then, power supply is to this special circuit power supply; 2. the thermal sensor of two series connection; One of them is soaked in the fluid thermal conductive medium fully; And can be fully by the impact flow of fluid media (medium), another is soaked in the fluid thermal conductive medium fully, can experience the temperature variation of fluid cooling media fully; 3. the output terminal of detection signal (3,4) lays respectively between two adjustable resistances of polyphone and between two thermal sensors of polyphone; 4. through the resistance of adjustment adjustable resistance, obtain the dynamic response performance that fluid flows according to the monitor signal of exporting.
2. a kind of method and the special circuit based on thermal conduction principle test fluid media flow according to claim 1 is characterized in that: two thermal sensors (R3, R4) complete, be immersed in the fluid thermal conductive medium of same position fully.
3. isolated plant based on thermal conduction principle test fluid media flow; It is characterized in that: comprise two adjustable resistances, two thermal sensors, the mobile district of fluid media (medium)s and fluid media (medium) stable regions; Two adjustable resistances (R1, R2) series connection; With two thermal sensors of connecting (R3, R4) parallel connection, constitute special circuit then, power supply is to this special circuit power supply; The thermal sensor of two series connection; One of them is arranged on the mobile district of fluid media (medium) (1); Be soaked in fully in the fluid thermal conductive medium, and can be fully by the impact flow of fluid media (medium), another is arranged on fluid media (medium) stable region (2); Be soaked in fully in the fluid thermal conductive medium, can experience the temperature variation of fluid cooling media fully; The output terminal of detection signal (3,4) lays respectively between two adjustable resistances of polyphone and between two thermal sensors of polyphone; Through the resistance of adjustment adjustable resistance, obtain the dynamic response performance that fluid flows according to the monitor signal of exporting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110400891 CN102410971B (en) | 2011-12-07 | 2011-12-07 | Method and special device for detecting flowing of fluid medium based on heat conductivity principle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110400891 CN102410971B (en) | 2011-12-07 | 2011-12-07 | Method and special device for detecting flowing of fluid medium based on heat conductivity principle |
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| CN102410971A true CN102410971A (en) | 2012-04-11 |
| CN102410971B CN102410971B (en) | 2013-01-09 |
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| CN 201110400891 Expired - Fee Related CN102410971B (en) | 2011-12-07 | 2011-12-07 | Method and special device for detecting flowing of fluid medium based on heat conductivity principle |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2357469A1 (en) * | 1973-11-17 | 1975-05-22 | Moto Meter Gmbh | DEVICE FOR TUNING TWO OR MORE CARBURETTORS |
| SU679881A1 (en) * | 1978-02-20 | 1979-08-15 | Специализированное Управление Пусконаладочных Работ Треста "Ирмонтажстрой" Главсредазирсовхозстроя | Direction and velocity of flow indicator |
| US5218866A (en) * | 1991-02-19 | 1993-06-15 | The United States Of America As Represented By The Secretary Of The Army | Method and device for measuring fluid velocities |
| JPH07209318A (en) * | 1994-01-11 | 1995-08-11 | Tama Electric Co Ltd | Fitting mechanism for wind velocity sensor |
| JPH07333025A (en) * | 1994-06-08 | 1995-12-22 | Unisia Jecs Corp | Thermal air flowmeter |
| JPH11118567A (en) * | 1997-10-09 | 1999-04-30 | Tokyo Gas Co Ltd | Flow sensor |
| CN101275863A (en) * | 2007-03-27 | 2008-10-01 | 霍尼韦尔国际公司 | Mass airflow sensing system including resistive temperature sensors and a heating element |
| CN202351149U (en) * | 2011-12-07 | 2012-07-25 | 保定天威集团有限公司 | Special device used for detecting flow of fluid medium based on thermal conductance principle |
-
2011
- 2011-12-07 CN CN 201110400891 patent/CN102410971B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2357469A1 (en) * | 1973-11-17 | 1975-05-22 | Moto Meter Gmbh | DEVICE FOR TUNING TWO OR MORE CARBURETTORS |
| SU679881A1 (en) * | 1978-02-20 | 1979-08-15 | Специализированное Управление Пусконаладочных Работ Треста "Ирмонтажстрой" Главсредазирсовхозстроя | Direction and velocity of flow indicator |
| US5218866A (en) * | 1991-02-19 | 1993-06-15 | The United States Of America As Represented By The Secretary Of The Army | Method and device for measuring fluid velocities |
| JPH07209318A (en) * | 1994-01-11 | 1995-08-11 | Tama Electric Co Ltd | Fitting mechanism for wind velocity sensor |
| JPH07333025A (en) * | 1994-06-08 | 1995-12-22 | Unisia Jecs Corp | Thermal air flowmeter |
| JPH11118567A (en) * | 1997-10-09 | 1999-04-30 | Tokyo Gas Co Ltd | Flow sensor |
| CN101275863A (en) * | 2007-03-27 | 2008-10-01 | 霍尼韦尔国际公司 | Mass airflow sensing system including resistive temperature sensors and a heating element |
| CN202351149U (en) * | 2011-12-07 | 2012-07-25 | 保定天威集团有限公司 | Special device used for detecting flow of fluid medium based on thermal conductance principle |
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| CN102410971B (en) | 2013-01-09 |
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