CN214585030U - Generator hollow copper conductor film thermal resistance measuring device - Google Patents
Generator hollow copper conductor film thermal resistance measuring device Download PDFInfo
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- CN214585030U CN214585030U CN202120166611.9U CN202120166611U CN214585030U CN 214585030 U CN214585030 U CN 214585030U CN 202120166611 U CN202120166611 U CN 202120166611U CN 214585030 U CN214585030 U CN 214585030U
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Abstract
A thermal resistance measuring device for a film layer of a hollow copper conductor of a generator comprises a hollow copper conductor test piece, a measuring device and a measuring device, wherein the hollow copper conductor test piece comprises a hollow copper conductor, an external sleeve and a direct current power supply connected with the hollow copper conductor; the oil circulation constant temperature system at the outer side of the lead comprises a constant temperature insulating oil tank connected with the sleeve; the wire inner side water circulation cooling system comprises an inner cold water tank, the inner cold water tank is connected with the hollow copper wire, and a water inlet flow detection sensor is arranged on a pipeline at the bottom of the inner cold water tank, which is connected with the hollow copper wire; a sleeve inlet oil temperature detection sensor and a sleeve outlet oil temperature detection sensor are respectively arranged on pipelines connected with the two ends of the sleeve and the constant-temperature insulating oil tank, and a hollow copper wire test piece water inlet temperature detection sensor and a hollow copper wire test piece water outlet temperature detection sensor are respectively arranged on pipelines connected with the two ends of the hollow copper wire and the inner cooling water tank; an automatic control system.
Description
Technical Field
The utility model belongs to the technical field of power generation equipment corrosion monitoring and chemical cleaning, especially, relate to a generator hollow copper conductor rete thermal resistance survey device.
Background
During the long-term operation of the cold water system in the generator, the hollow copper wire can be corroded for various reasons (yew. the control principle and the application technology research of the corrosion of trace copper in pure water [ D ]. Shanghai: college of Tongji, 2002). When the conditions of chemical cleaning are met (the cooling water quality in the DL/T801-. Before this, a laboratory-scale cleaning bench test is required to ensure no damage to the system and optimized process conditions (cooling water quality in DL/T801-. Therefore, the evaluation of the corrosion degree and the cleaning effect of the hollow copper wire is a key link of a small cleaning test.
Material surface inspection is often used to evaluate the degree of corrosion and cleaning of copper wire. The method is characterized in that a cut hollow copper conductor or a corrosion product washed out from a system is used as a detection object, the surface micro-morphology and the surface composition of the hollow copper conductor are observed by adopting large instruments such as a scanning electron microscope, an energy spectrometer and the like, and the corrosion degree of the hollow copper conductor is represented by the distribution condition and the chemical composition of the corrosion product. Meanwhile, the chemical cleaning effect of the hollow-core Copper wire is evaluated by comparing and analyzing the microscopic morphology and the chemical composition of the chemically cleaned hollow-core Copper wire and the corroded hollow-core Copper wire (VOBODAs R. Deposits and corosion in Water-Cooled Generator State machine WINDING: Part 1: Behaviour of Copper [ J ]. Powerplant Chemistry,2018,20 (5); Liliang, Liu Guo Qiang, Song Lisha, etc.. Generator bar Stator blockage problem analysis and cleaning pre-filming effect evaluation [ J ]. cleaning world, 2016,32(05): 1-6). However, the information of local corrosion micro-morphology and chemical composition of the inner surface of the hollow copper wire is obtained by material surface detection, and the corrosion condition of the hollow copper wire cannot be reflected on the whole. Before the detection and analysis of the material surface, the pretreatment operations such as pipe cutting of a hollow copper wire, observation of test piece metal spraying and the like are needed, and the operation is relatively complicated.
The corrosion degree and the cleaning effect of the hollow copper conductor film can be integrally evaluated by the thermal resistance of the hollow copper conductor film. Metallic copper has a different thermal conductivity than copper oxide. When an oxide film layer exists on the inner surface of the copper wire, the oxide film layer can generate larger heat transfer resistance. Under the same heat exchange condition, the film thermal resistances measured by the hollow copper wires with the inner surfaces having the oxide films with different thicknesses are different. Therefore, the corrosion degree and the chemical cleaning effect of the copper wire can be indirectly represented according to the thermal resistance of the film layer of the hollow copper wire. However, at present, no integrated device for measuring the thermal resistance of the film layer of the hollow-core copper wire is available.
SUMMERY OF THE UTILITY MODEL
To the technical problem who exists in the background art, the utility model provides a generator hollow copper conductor rete thermal resistance survey device adopts the device, can survey the rete thermal resistance of hollow copper conductor to through this macroscopic index of rete thermal resistance evaluation hollow copper conductor degree of corrosion and chemical cleaning effect on the whole.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a thermal resistance measuring device for a film layer of a hollow copper conductor of a generator comprises a hollow copper conductor test piece, an oil circulation constant temperature system at the outer side of the conductor, a water circulation cooling system at the inner side of the conductor and an automatic control system; wherein the content of the first and second substances,
the hollow copper wire test piece comprises a hollow copper wire, a sleeve sleeved outside the hollow copper wire and a direct current power supply connected with two ends of the hollow copper wire;
the oil circulation constant temperature system at the outer side of the lead comprises a constant temperature insulating oil tank connected with two ends of the sleeve through pipelines, and insulating oil is filled in the constant temperature insulating oil tank;
the water circulation cooling system at the inner side of the wire comprises an inner cooling water tank, the top and the bottom of the inner cooling water tank are respectively connected with two ends of a hollow copper wire through pipelines, and a hollow copper wire test piece water inflow flow detection sensor is arranged on the pipeline connecting the bottom of the inner cooling water tank and the hollow copper wire;
a sleeve inlet oil temperature detection sensor and a sleeve outlet oil temperature detection sensor are respectively arranged on pipelines connected with the two ends of the sleeve and the constant-temperature insulating oil tank, and a hollow copper wire test piece water inlet temperature detection sensor and a hollow copper wire test piece water outlet temperature detection sensor are respectively arranged on pipelines connected with the hollow copper wire and the two ends of the inner cooling water tank;
the automatic control system comprises a control box, wherein the control box is used for controlling the start and stop of all electrical components in the device, collecting sensor signals and calculating the real-time film thermal resistance of the hollow copper conductor.
Furthermore, the outer part of the inner cold water tank is provided with a constant temperature interlayer, the top and the bottom of the constant temperature interlayer are provided with an inlet and an outlet, the device also comprises a constant temperature water tank, and the constant temperature water tank is connected with the inlet and the outlet of the constant temperature interlayer.
Preferably, the constant-temperature water tank is made of stainless steel, and the temperature control precision is +/-0.1 ℃;
preferably, the sleeve pipe is the organic glass pipe, organic glass pipe both ends adopt epoxy to seal, the inside and both ends of hollow copper conductor suit of organic glass pipe stretch out the organic glass outside of tubes.
Furthermore, a circulating pump is further installed on a pipeline connecting the bottom of the inner cooling water tank and the hollow copper wire, and a backflow pipeline is arranged at the outlet of the circulating pump and connected with the top of the inner cooling water tank.
Preferably, the dc power supply is a low voltage dc power supply.
Furthermore, a snake-shaped condensation pipe is also arranged on a pipeline connecting the top of the inner cooling water tank and the hollow copper wire.
Preferably, the serpentine condenser tube is made of glass.
The inner cold water tank is made of glass, and a constant-temperature interlayer is arranged outside the inner cold water tank;
the flow range of the circulating pump is 20-40L/min, and the lift is 12-14 m;
the measuring range of the water inlet flow detection sensor for the copper wire test piece is 0-10L/min;
the length of the flow cross section of the hollow copper conductor is 7mm, the width of the flow cross section of the hollow copper conductor is 2mm, and the length of the flow cross section of the hollow copper conductor is 1.2 m;
the direct current power supply is in a constant current mode, and the current is 0-5A;
the constant-temperature insulating oil tank is made of stainless steel, and the temperature control precision is +/-0.1 ℃;
the temperature detection sensor is PT100 in model and has a temperature measurement range of 0-100 ℃.
Further, the heat transfer resistance of the hollow-core copper conductor is calculated according to the formula:
in the formula:
RHTthermal resistance to heat transfer of hollow copper wire, m2·K/W；
A-external surface area of hollow copper wire, m2(ii) a When the external surface area of the hollow copper wire is calculated, the external surface area can be obtained only by knowing the external diameter or the external perimeter of the hollow copper wire and the overall length of the hollow copper wire.
GRThe water inlet flow of the hollow copper wire test piece is kg/s;
Cp-specific heat capacity of water, J/(kg · K);
t1、t2water inlet and outlet temperatures K of the hollow copper wire test piece;
T1、T2-the temperature of the oil at the inlet and outlet of the bushing, K;
the heat transfer resistance of the film layer is the heat transfer resistance of the corroded hollow copper wire, namely the heat transfer resistance of the hollow copper wire which is not corroded or chemically cleaned.
The utility model discloses following beneficial effect has:
the utility model discloses cold water velocity of flow and hollow copper conductor circular telegram and heat transfer condition in the simulation, each component through integrated control rete thermal resistance survey device has simplified the step of experimental survey, and can be according to real-time temperature, flow and rete thermal resistance survey value judgement test's terminal point and carry out fault diagnosis to the device.
By measuring the film thermal resistance of the corroded hollow copper wire and the hollow copper wire after chemical cleaning, the corrosion degree of the hollow copper wire and the cleaning degree of oxide film chemical cleaning can be integrally evaluated, and further a criterion is provided for determining whether the hollow copper wire is subjected to chemical cleaning and selecting a chemical cleaning process.
Drawings
The present invention will be further described with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the hollow core copper wire test piece structure of the present invention;
in the figure: 1-a constant temperature water tank; 2-inner cold water tank; 3-a circulating pump; 4-a water inflow detection sensor of the hollow copper wire test piece; 5-hollow copper wire test piece; 51-plexiglass tube; 52-hollow copper wire; 53-epoxy resin; 54-low voltage dc power supply; 6-constant temperature insulation oil tank; 7-serpentine glass condenser tube; 8-a control box; 9-exhaust valve of inner cooling water tank; 10-bottom drain valve of inner cooling water tank; 11-circulation pump inlet valve; 12-a circulating pump outlet valve; 13-circulation pump return valve; 14-a water inlet valve of a hollow copper wire test piece; 15-a hollow copper wire test piece water outlet valve; 16-a water inlet temperature detection sensor of a hollow copper wire test piece; 17-a hollow copper wire test piece effluent water temperature detection sensor; 18-an organic glass tube inlet oil temperature detection sensor; 19-organic glass tube outlet oil temperature detection sensor.
Detailed Description
Example (b):
as shown in fig. 1, the embodiment of the utility model provides a generator hollow copper conductor rete thermal resistance survey device, including hollow copper conductor test piece 5, wire outside oil circulation constant temperature system, the inboard water circulative cooling system of wire and automatic control system.
As shown in fig. 2, the hollow copper wire test piece 5 includes a hollow copper wire 52, an organic glass tube 51 and a low-voltage dc power supply 54, the hollow copper wire 52 is encapsulated in the organic glass tube 51 by epoxy resin 53, a constant-temperature oil inlet and outlet branch tube is arranged on the side surface of the organic glass tube 51, the hollow copper wire 52 exceeds two ends of the organic glass tube 51 and is connected with the positive and negative electrode connectors of the low-voltage dc power supply 54, and two ends of the hollow copper wire 52 are respectively connected with the circulating cooling water inlet and outlet connectors of the water circulating cooling system on the inner side.
Referring to fig. 1 again, the wire outside oil circulation constant temperature system includes a constant temperature insulating oil tank 6, an organic glass tube inlet oil temperature detection sensor 18 and an organic glass tube outlet oil temperature detection sensor 19, and the constant temperature insulating oil tank 6 is connected with a constant temperature oil inlet and outlet branch pipe on the side of the organic glass tube 51 through a pipeline. The water circulation cooling system on the inner side of the wire comprises a constant-temperature water tank 1, an inner cooling water tank 2, a circulating pump 3, a hollow copper wire test piece water inflow flow detection sensor 4, a hollow copper wire test piece water inflow water temperature detection sensor 16, a hollow copper wire test piece water outflow water temperature detection sensor 7 and a snake-shaped glass condensation pipe 7. The outer part of the inner cold water tank 2 is provided with a constant temperature interlayer, the constant temperature interlayer is provided with an inlet and an outlet, and the constant temperature water tank 1 is connected with the inlet and the outlet of the constant temperature interlayer through a pipeline. The outlet at the bottom of the inner cooling water tank 2 is sequentially connected with a circulating pump 3, a hollow copper wire test piece water inflow flow detection sensor 4, a hollow copper wire test piece water inflow water temperature detection sensor 16, a hollow copper wire test piece 5, a hollow copper wire test piece water outflow water temperature detection sensor 17 and a snake-shaped glass condensation pipe 7 through pipelines. And the inlet and the outlet of the circulating pump 3 are respectively provided with a circulating pump inlet valve 11 and a circulating pump outlet valve 12. The water inlet flow detection sensor 4 is characterized in that a hollow copper wire test piece water inlet valve 14 is arranged at the front end of the hollow copper wire test piece water inlet flow detection sensor, a return pipe is arranged between the circulating pump outlet valve 11 and the hollow copper wire test piece water inlet valve 14, a circulating pump return valve 13 is arranged on the return pipe, and a hollow copper wire test piece water outlet valve 15 is arranged between the snake-shaped glass condensation pipe 7 and the hollow copper wire outlet.
The automatic control system comprises a CPU (central processing unit) and an expansion module thereof, a touch screen and corresponding electrical accessories thereof, the remote end controls the start and stop of the constant-temperature water tank 1, the circulating pump 3, the constant-temperature insulating oil tank 6 and the low-voltage direct-current power supply 54, signals of the flow detection sensor and the temperature detection sensors are acquired on line, and the real-time film thermal resistance of the hollow copper wire 52 is calculated according to a film thermal resistance calculation formula.
The present invention and the embodiments thereof have been described above, but the description is not limited thereto, and the embodiment shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should understand that they should not be limited to the embodiments described above, and that they can design the similar structure and embodiments without departing from the spirit of the invention.
Claims (9)
1. The utility model provides a generator hollow copper conductor rete thermal resistance survey device which characterized in that: the device comprises a hollow copper wire test piece, a wire outer side oil circulation constant temperature system, a wire inner side water circulation cooling system and an automatic control system; wherein the content of the first and second substances,
the hollow copper wire test piece comprises a hollow copper wire, a sleeve sleeved outside the hollow copper wire and a direct current power supply connected with two ends of the hollow copper wire;
the oil circulation constant temperature system at the outer side of the lead comprises a constant temperature insulating oil tank connected with two ends of the sleeve through pipelines, and insulating oil is filled in the constant temperature insulating oil tank;
the water circulation cooling system at the inner side of the wire comprises an inner cooling water tank, the top and the bottom of the inner cooling water tank are respectively connected with two ends of a hollow copper wire through pipelines, and a hollow copper wire test piece water inflow flow detection sensor is arranged on the pipeline connecting the bottom of the inner cooling water tank and the hollow copper wire;
a sleeve inlet oil temperature detection sensor and a sleeve outlet oil temperature detection sensor are respectively arranged on pipelines connected with the two ends of the sleeve and the constant-temperature insulating oil tank, and a hollow copper wire test piece water inlet temperature detection sensor and a hollow copper wire test piece water outlet temperature detection sensor are respectively arranged on pipelines connected with the hollow copper wire and the two ends of the inner cooling water tank;
the automatic control system comprises a control box, wherein the control box is used for controlling the start and stop of all electrical components in the device, collecting sensor signals and calculating the real-time film thermal resistance of the hollow copper conductor.
2. The device for measuring the film thermal resistance of the hollow copper conductor of the generator according to claim 1, wherein: the device comprises an inner cooling water tank, a constant-temperature interlayer, an inlet and an outlet, and a constant-temperature water tank, wherein the constant-temperature interlayer is arranged outside the inner cooling water tank, and the top and the bottom of the constant-temperature interlayer are provided with the inlet and the outlet.
3. The device for measuring the film thermal resistance of the hollow copper conductor of the generator according to claim 2, wherein: the constant temperature water tank is made of stainless steel, and the temperature control precision is +/-0.1 ℃.
4. The device for measuring the film thermal resistance of the hollow copper conductor of the generator according to claim 1, wherein: the sleeve pipe is the organic glass pipe, organic glass pipe both ends adopt epoxy to seal, the hollow copper conductor suit is inside and both ends stretch out the organic glass outside of tubes at the organic glass.
5. The device for measuring the film thermal resistance of the hollow copper conductor of the generator according to claim 1, wherein: and a circulating pump is further arranged on a pipeline connecting the bottom of the inner cooling water tank with the hollow copper wire, and a backflow pipeline is arranged at the outlet of the circulating pump and connected with the top of the inner cooling water tank.
6. The device for measuring the film thermal resistance of the hollow copper conductor of the generator according to claim 5, wherein: the flow range of the circulating pump is 20-40L/min, and the lift of the circulating pump is 12-14 m.
7. The device for measuring the film thermal resistance of the hollow copper conductor of the generator according to claim 1, wherein: the direct current power supply is a low-voltage direct current power supply.
8. The device for measuring the film thermal resistance of the hollow copper conductor of the generator according to claim 1, wherein: and a snakelike glass condenser pipe is also arranged on a pipeline connecting the top of the inner cold water tank and the hollow copper wire.
9. The device for measuring the film thermal resistance of the hollow copper conductor of the generator according to claim 1, wherein: the inner cold water tank is made of glass, and a constant-temperature interlayer is arranged outside the inner cold water tank;
the water inflow rate detection sensor of the hollow copper wire test piece is used for measuring the water inflow rate within the range of 0-10L/min;
the length of the flow cross section of the hollow copper conductor is 7mm, the width of the flow cross section of the hollow copper conductor is 2mm, and the length of the flow cross section of the hollow copper conductor is 1.2 m;
the direct current power supply is in a constant current mode, and the current is 0-5A;
the constant-temperature insulating oil tank is made of stainless steel, and the temperature control precision is +/-0.1 ℃;
the water temperature detection sensor is PT100 in model and has a temperature measurement range of 0-100 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120166611.9U CN214585030U (en) | 2021-01-21 | 2021-01-21 | Generator hollow copper conductor film thermal resistance measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120166611.9U CN214585030U (en) | 2021-01-21 | 2021-01-21 | Generator hollow copper conductor film thermal resistance measuring device |
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| CN214585030U true CN214585030U (en) | 2021-11-02 |
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| CN202120166611.9U Active CN214585030U (en) | 2021-01-21 | 2021-01-21 | Generator hollow copper conductor film thermal resistance measuring device |
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