CN117232675B - Generator stator temperature sensor and processing method thereof - Google Patents
Generator stator temperature sensor and processing method thereof Download PDFInfo
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- CN117232675B CN117232675B CN202311503916.4A CN202311503916A CN117232675B CN 117232675 B CN117232675 B CN 117232675B CN 202311503916 A CN202311503916 A CN 202311503916A CN 117232675 B CN117232675 B CN 117232675B
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- 238000003672 processing method Methods 0.000 title claims abstract description 21
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 49
- 238000004804 winding Methods 0.000 claims abstract description 48
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000000741 silica gel Substances 0.000 claims abstract description 37
- 229910002027 silica gel Inorganic materials 0.000 claims abstract description 37
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 29
- 239000004642 Polyimide Substances 0.000 claims abstract description 28
- 229920001721 polyimide Polymers 0.000 claims abstract description 28
- 238000003466 welding Methods 0.000 claims abstract description 23
- 239000004593 Epoxy Substances 0.000 claims abstract description 22
- 239000004744 fabric Substances 0.000 claims abstract description 22
- 239000011521 glass Substances 0.000 claims abstract description 22
- 238000004806 packaging method and process Methods 0.000 claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 229910052709 silver Inorganic materials 0.000 claims abstract description 8
- 239000004332 silver Substances 0.000 claims abstract description 8
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 16
- 239000011737 fluorine Substances 0.000 claims description 16
- 229910052731 fluorine Inorganic materials 0.000 claims description 16
- 229920001971 elastomer Polymers 0.000 claims description 15
- 238000009413 insulation Methods 0.000 claims description 7
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 5
- 238000001125 extrusion Methods 0.000 claims description 5
- 239000003063 flame retardant Substances 0.000 claims description 5
- 239000012774 insulation material Substances 0.000 claims description 4
- 230000032683 aging Effects 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 230000000052 comparative effect Effects 0.000 description 9
- 230000007774 longterm Effects 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- IJKVHSBPTUYDLN-UHFFFAOYSA-N dihydroxy(oxo)silane Chemical compound O[Si](O)=O IJKVHSBPTUYDLN-UHFFFAOYSA-N 0.000 description 5
- 239000003822 epoxy resin Substances 0.000 description 5
- 229920001973 fluoroelastomer Polymers 0.000 description 5
- 229920002313 fluoropolymer Polymers 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 229920000647 polyepoxide Polymers 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 239000003292 glue Substances 0.000 description 4
- 229910052697 platinum Inorganic materials 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000010445 mica Substances 0.000 description 3
- 229910052618 mica group Inorganic materials 0.000 description 3
- 238000012797 qualification Methods 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000011295 pitch Substances 0.000 description 2
- 238000009517 secondary packaging Methods 0.000 description 2
- 238000003878 thermal aging Methods 0.000 description 2
- 229910000754 Wrought iron Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Insulation, Fastening Of Motor, Generator Windings (AREA)
Abstract
The invention provides a generator stator temperature sensor and a processing method thereof, wherein the method comprises the steps of manufacturing an insulating framework with symmetrical sawtooth winding parts at the edges of two sides of a front section and 2 rows of preset threading holes in the two sides of a rear section by using polyimide insulating plates; winding a platinum wire on the symmetrical sawtooth winding part by adopting a double winding method, and enabling two connecting ends of the platinum wire to respectively pass through 1 row of preset threading holes to respectively corresponding preset welding positions; welding silver wires on the two connecting ends at the corresponding preset welding positions to obtain a temperature sensing circuit core, and packaging the temperature sensing circuit core in an inner shell of the epoxy glass cloth laminated board by using silica gel for one time to obtain a temperature sensing element; performing tolerance grade adjustment calibration on the temperature sensing element in the constant temperature tank to obtain a temperature sensing element finished product; and connecting a silver wire of a temperature sensing element finished product with a lead cable, and then secondarily packaging the silver wire in an outer shell of the epoxy glass cloth laminated board by using silica gel to obtain the generator stator temperature sensor. The processing method is simple and high in efficiency, and the reliability of the device is improved.
Description
Technical Field
The invention relates to the technical field of temperature sensors, in particular to a generator stator temperature sensor and a processing method thereof.
Background
In the working process of the large-sized generator set at present, in order to accurately grasp the working states and heating conditions of the stator winding and the iron core and ensure the reliable operation of the generator set, a monitoring means adopted generally is an embedded thermometer method, for example, a temperature sensor is embedded in key positions of the winding and the iron core of the large-sized generator set with the size of more than 30 kilowatts. The temperature sensor for the stator core is embedded in the core lamination of the main machine factory, so that the temperature sensor cannot be replaced once the temperature sensor fails. The temperature sensor for the stator winding is buried between stator bar layers and at the bottom of a stator bar iron core groove, and the whole bar is required to be detached during replacement, so that the construction difficulty is high, the working condition is complex, and the period is long. Therefore, the large-sized generator has higher requirements on the reliability and the service life of the stator temperature sensor, and the same service life with winding is advocated at present, and the service life is at least more than 15 years.
Compared with the traditional large-sized generator stator temperature sensor which adopts mica as a platinum wire winding framework, the vibration resistance of the traditional large-sized generator stator temperature sensor is poor; the inter-turn winding method adopts a single winding method, and has poor anti-interference capability; the purity of silver wire welded by the platinum wire pins is lower than 99%, so that the welding and signal transmission are inconvenient; the platinum wire element is packaged by epoxy resin glue, so that the vibration resistance is poor, the stress is large, and the class A precision is difficult to achieve; the insulating shell is processed by adopting an F-level epoxy resin laminated board, so that the temperature resistance level is low; the rear end lead of the sensor is a fluoroplastic cable, so that the tensile strength is low, and the sensor is easy to damage in later wiring and pulling. The processing method is simple, has high efficiency, greatly improves the reliability of the temperature sensor of the large-sized generator, and greatly improves the operation and maintenance cost of the large-sized generator.
Accordingly, the prior art is still in need of improvement and development.
Disclosure of Invention
The invention provides a generator stator temperature sensor and a processing method thereof, and aims to solve the technical problems in the background art part in the processing method of the generator stator temperature sensor in the prior art.
The invention comprises the following steps:
the first aspect of the invention provides a processing method of a generator stator temperature sensor, which comprises the following steps:
the method comprises the steps of manufacturing an insulating framework with symmetrical sawtooth winding parts at the edges of two sides of a front section and 2 rows of preset threading holes in the two sides of a rear section by taking a polyimide insulating plate as a raw material;
winding a platinum wire on the symmetrical sawtooth winding part of the insulating framework by adopting a double winding method, and enabling two connecting ends of the platinum wire to respectively penetrate through 1 row of preset threading holes to respectively corresponding preset welding positions;
respectively welding silver wires on the two connecting ends at the preset welding positions corresponding to the connecting ends to obtain a temperature sensing circuit core;
the temperature sensing circuit core is packaged in an inner shell made of an epoxy glass cloth laminated board by silica gel once, and the silver wire is exposed from one end, so that a temperature sensing element is obtained;
performing tolerance level adjustment calibration on the temperature sensing element in the constant temperature tank to obtain a temperature sensing element finished product;
and connecting the silver wire of the temperature sensing element finished product with a lead cable, and then secondarily packaging the silver wire in an outer shell made of an epoxy glass cloth laminated board by using silica gel to obtain the generator stator temperature sensor.
In an optional embodiment of the first aspect of the present invention, a front section of the guiding cable extending into the outer casing is protected from breakage by using a fluororubber heat shrink tube.
In an alternative embodiment of the first aspect of the present invention, the temperature resistance of the fluorine rubber heat-shrinkable tube is 190-200 ℃, the flame retardant rating of the fluorine rubber heat-shrinkable tube is VW-1, the heat aging elongation at break of the fluorine rubber heat-shrinkable tube is more than or equal to 200%, and the dielectric strength of the fluorine rubber heat-shrinkable tube is more than or equal to 7.9KV/mm.
In an alternative embodiment of the first aspect of the present invention, the diameter of the platinum wire is 0.04mm, the α coefficient of the platinum wire is 0.003851 to 0.003856, the thickness of the insulating skeleton is 0.3 to 0.4mm, the diameter of the silver wire is 0.4mm, and the purity of the silver wire is 99.99%.
In an alternative embodiment of the first aspect of the present invention, the inter-turn spacing of the platinum wire on the symmetrical saw tooth winding portion is 0.5mm.
In an alternative embodiment of the first aspect of the present invention, the silica gel is a heat-conducting insulating silica gel, the heat-resistant temperature of the heat-conducting insulating silica gel is 190-200 ℃, and the volume resistivity of the heat-conducting insulating silica gel is not less than 1×10 15 Omega cm, the thermal conductivity of the heat conduction insulating silica gel is more than or equal to 1.3 (W/m.k).
In an alternative embodiment of the first aspect of the present invention, the epoxy glass cloth laminate has an insulation grade of H.
In an alternative embodiment of the first aspect of the present invention, the insulation material of the lead cable is extrusion-grade polyimide, the temperature resistance temperature of the extrusion-grade polyimide is greater than or equal to 230 ℃, the specific strength of the extrusion-grade polyimide is greater than or equal to 176MPa, and the tensile strength of the extrusion-grade polyimide is greater than or equal to 80MPa.
In an optional embodiment of the first aspect of the present invention, the temperature of the thermostatic bath is 0 ℃, and the precision grade of the temperature sensing element finished product is grade a.
The second aspect of the invention provides a generator stator temperature sensor, which is manufactured by the processing method of the generator stator temperature sensor.
The beneficial effects are that: the invention provides a generator stator temperature sensor and a processing method thereof, wherein the method comprises the steps of manufacturing an insulating framework with symmetrical sawtooth winding parts at the edges of two sides of a front section and 2 rows of preset threading holes in the two sides of a rear section by using polyimide insulating plates; winding a platinum wire on the symmetrical sawtooth winding part by adopting a double winding method, and enabling two connecting ends of the platinum wire to respectively pass through 1 row of preset threading holes to respectively corresponding preset welding positions; welding silver wires on the two connecting ends at the corresponding preset welding positions to obtain a temperature sensing circuit core, and packaging the temperature sensing circuit core in an inner shell of the epoxy glass cloth laminated board by using silica gel for one time to obtain a temperature sensing element; performing tolerance grade adjustment calibration on the temperature sensing element in the constant temperature tank to obtain a temperature sensing element finished product; and connecting a silver wire of a temperature sensing element finished product with a lead cable, and then secondarily packaging the silver wire in an outer shell of the epoxy glass cloth laminated board by using silica gel to obtain the generator stator temperature sensor. The processing method is simple and high in efficiency, and the reliability of the device is improved.
Drawings
FIG. 1 is a block flow diagram of a method for manufacturing a generator stator temperature sensor according to the present invention.
Fig. 2 is a schematic structural diagram of a temperature sensing circuit core according to the present invention.
Fig. 3 is a schematic cross-sectional structure of a temperature sensing element according to the present invention.
Fig. 4 is a schematic cross-sectional view of a temperature sensor for a stator of a generator according to the present invention.
Detailed Description
The present invention will be described in further detail below in order to make the objects, technical solutions and effects of the present invention more clear and distinct. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, a first aspect of the present invention provides a method for processing a temperature sensor of a stator of a generator, including the steps of:
s100, using polyimide insulating plates (the thickness of the insulating framework is 0.3-0.4mm in an exemplary manner) as raw materials to manufacture an insulating framework 30 with symmetrical sawtooth winding parts 10 (the tooth pitches of the symmetrical sawtooth winding parts are 0.5mm in an exemplary manner) at the edges of the two sides of the front section and 2 rows of preset threading holes 20 at the inner parts of the two sides of the rear section; referring to fig. 2, the insulating frame 30 of the present invention includes a front half and a rear half, both sides of the front half in the length direction are provided with saw tooth winding parts, both upper and lower sides of the rear half in the length direction are provided with 2 rows of preset threading holes 20, and in fig. 2, each row of preset threading holes 20 includes 3 preset threading holes. The conventional generator stator temperature sensor usually uses mica as a winding framework, and has the advantages of being brittle, extremely difficult to process, less than 50% in qualification rate in the actual processing process, higher overall production cost, and the inventor finds that a polyimide plate is adopted, the thickness is 0.3-0.4mm, and the pitch of 0.5mm is obtained through a numerical control processing center to form inter-turn spacing, so that the insulating framework can withstand the temperature of 190-200 ℃ for a long time, the reliable insulating characteristic of a platinum wire on the upper edge is provided, and meanwhile, the insulating framework has good vibration resistance, elastic toughness, convenient machining, high production efficiency, excellent performance of a prepared device and high quality qualification rate.
S200, winding a platinum wire 40 on the symmetrical sawtooth winding part 10 of the insulating framework 30 by adopting a double-winding method (the diameter of the platinum wire 40 is 0.04mm in an exemplary way, the alpha coefficient of the platinum wire 40 is 0.003851-0.003856), and respectively passing two connecting ends of the platinum wire 40 through 1 row of preset threading holes 20 to respective corresponding preset welding positions; referring to fig. 2, in the present invention, the platinum wires 40 may be regarded as 2 wires, 2 wires 40 are wound on the symmetrical saw tooth winding portion 10 at intervals (the inter-turn distance between the wires 40 on the symmetrical saw tooth winding portion 10 is 0.5mm, or the distance between adjacent saw teeth of the saw tooth winding portion is 0.5 mm), one ends of the 2 wires, which are far away from the 2 rows of preset threading holes 20, are connected together and fixed on the insulating frame 30, one ends of the 2 wires 40, which face the 2 rows of preset threading holes 20, respectively pass through the 1 rows of preset threading holes 20 to respective corresponding preset welding positions, and each wire 40 sequentially passes through the 3 holes in a positive and negative winding alternating manner, taking each row of preset threading holes 20 as 3 holes as an example.
S300, welding silver wires 50 on the two connecting ends at the preset welding positions corresponding to the connecting ends respectively to obtain a temperature sensing circuit core; in the present invention, referring to fig. 2, one silver wire 50 is connected to each of 2 platinum wires 40, and the present invention uses the silver wire 50 having a diameter of 0.4mm and a purity of 99.99% as an example.
S400, packaging the temperature sensing circuit core in an inner shell 70 made of epoxy glass cloth laminated board by using silica gel 60 once, and exposing the silver wire 50 from one end to obtain a temperature sensing element; referring to fig. 3, in the present invention, the temperature sensing circuit core is placed in an inner housing 70 with an opening at the right end, and the free end of the silver wire 50 is led out from the opening of the inner housing 70, and then the inner housing 70 is filled with silica gel 60 to encapsulate the temperature sensing circuit core, so as to obtain a temperature sensing element; in an exemplary embodiment of the first aspect of the present invention, the silica gel 60 is a heat-conducting insulating silica gel, the heat-resistant temperature of the heat-conducting insulating silica gel is 190-200 ℃, and the volume resistivity of the heat-conducting insulating silica gel is equal to or greater than 1×10 15 Omega cm, wherein the thermal conductivity of the heat-conducting insulating silica gel is more than or equal to 1.3 (W/m.k);
s500, performing tolerance grade adjustment calibration on the temperature sensing element in the constant temperature tank to obtain a temperature sensing element finished product; in an exemplary embodiment of the first aspect of the present invention, the temperature of the thermostatic bath may be 0 ℃, and the precision grade of the temperature sensing element finished product is grade a.
And S600, connecting the silver wire 50 of the temperature sensing element finished product with the lead cable 80, and then secondarily packaging the silver wire in an outer shell 90 made of an epoxy glass cloth laminated board by using silica gel 60 to obtain the generator stator temperature sensor. In the present invention, referring to fig. 3, the whole of the temperature sensing element and the head portion of the lead-in cable connected with the lead need to extend into the outer casing, that is, the head portion of the lead-in cable needs to be encapsulated by silica gel, in an exemplary embodiment of the first aspect of the present invention, the silica gel 60 used in step S600 is also a thermally conductive and insulating silica gel, the thermally conductive and insulating silica gel has a heat-resistant temperature of 190-200 ℃, and the volume resistivity of the thermally conductive and insulating silica gel is equal to or greater than 1×10 15 Omega cm, wherein the thermal conductivity of the heat-conducting insulating silica gel is more than or equal to 1.3 (W/m.k), and the insulating grade of the epoxy glass cloth laminated board is H grade; the insulation material of the lead cable 80 is extrusion-grade polyimide, theThe temperature resistance temperature of the extrusion-grade polyimide is more than or equal to 230 ℃, the specific strength of the extrusion-grade polyimide is more than or equal to 176Mpa (more than 3 times of aluminum alloy), and the tensile strength of the extrusion-grade polyimide is more than or equal to 80Mpa (more than 3 times of fluoroplastic).
Referring to fig. 4, in an alternative embodiment of the first aspect of the present invention, a front section of the guiding cable 80 extending into the outer housing 90 is protected from breakage by using a fluorine-containing heat shrink tube 100. In this embodiment of the present invention, when the silver wire 50 is connected to the lead cable, a heat shrink tube 100 of fluorine rubber is first sleeved on the connector position of the lead cable 80, and the lead cable 80 extending from the outer housing 90 is protected by the heat shrink tube 100 of fluorine rubber. In an exemplary embodiment of the first aspect of the present invention, the temperature resistance of the fluororubber heat-shrinkable tube 100 is 190-200 ℃, the flame retardant rating of the fluororubber heat-shrinkable tube 100 is VW-1, the heat aging elongation at break of the fluororubber heat-shrinkable tube 100 is not less than 200%, and the dielectric strength of the fluororubber heat-shrinkable tube 100 is not less than 7.9KV/mm.
In general, the processing method of the generator stator temperature sensor provided by the invention realizes reliable monitoring of the temperature in the generating process of large-scale generating sets such as hydropower, thermal power, nuclear power and the like by optimizing the processing technology, and the temperature sensor is simple and efficient to prepare and has high market popularization value. The anti-interference performance of the sensor can be improved by adopting a double-winding method. Polyimide plates with the thickness of 0.3-0.4mm are selected as winding frameworks, the inter-turn spacing is strictly controlled at 0.5mm, the vibration resistance of the sensor can be improved, the processing difficulty is reduced, and the processing efficiency is improved. The temperature sensing element processed by adopting the pure platinum wire with the diameter of 0.04mm and the alpha coefficient of 0.003851-0.003856 is adopted, so that the qualification rate of the A-level precision of the sensor can be improved from 60% to 95%. The welding performance and the electric conduction performance of the platinum wire can be improved by adopting the silver wire with the purity of 99.99 percent as the pin. The heat-conducting insulating silica gel is adopted as the packaging material, and can resist the temperature of 190-200 ℃ for a long time, and compared with epoxy resin, the epoxy resin has larger volume resistivity which is more than or equal to 1 multiplied by 10 15 The heat conduction efficiency of the sensor is higher than or equal to 1.3 (W/m.k), and the thermal response time, vibration resistance, heat conduction performance and reliability of the sensor can be greatly improved. Using class HThe epoxy glass cloth laminated board is used as a shell, and the sensor has better insulation and heat resistance. The cable processed by adopting extrusion-grade PI (polyimide) as an insulating material has higher long-term temperature resistance of more than or equal to 230 ℃ and specific strength of 176MPa, which is 3 times of that of aluminum alloy, and has tensile strength of more than or equal to 80MPa, which is 3-4 times of that of fluoroplastic.
In order to better illustrate the performance of the generator stator temperature sensor manufactured by the processing method, the invention constructs the following examples and comparative examples for performance test:
example 1: the processing method of the large-scale generator stator temperature sensor comprises the following implementation steps:
(1) Winding a platinum wire on an insulating framework made of a polyimide insulating plate by adopting a double winding method to form a circuit element with turn-to-turn insulation;
(2) Respectively welding 0.4mm silver wires on the tail ends of the platinum wires, and carrying out tolerance grade adjustment calibration in a constant temperature tank at 0 ℃;
(3) The temperature sensing element with the A-level precision after the adjustment calibration is packaged in an inner shell made of an epoxy glass cloth laminated board by silica gel to form a miniaturized temperature sensing element, and the temperature sensing element is manufactured into a product for secondary packaging in the later stage;
(4) A special cable is processed for a lead wire of a sensor aiming at the temperature measuring part of a large-sized generator stator.
(5) And after the temperature sensing element and the cable are welded, the temperature sensing element and the cable are packaged in an outer shell body processed by a final epoxy glass cloth laminated board, and a part of the lead coming out of the outer shell body is protected from broken wires by adopting a fluorine rubber heat-shrinkable tube.
The diameter of the platinum wire is 0.04mm, and the alpha coefficient is 0.003851-0.003856; the thickness of the polyimide insulating plate is 0.3-0.4mm. The coiling method of the platinum wire is a double-coiling method, and the coiling inter-turn spacing is 0.5mm. The purity of the silver wire welded at the tail end of the platinum wire is 99.99%. The silica gel for packaging the platinum wire wound element is heat-conducting insulating silica gel, and has long-term temperature resistance of 190-200 ℃ and volume resistivity of more than or equal to 1 multiplied by 10 15 Omega cm, the thermal conductivity is more than or equal to 1.3 (W/m.k). And the insulating grade of the epoxy glass cloth laminated board for packaging the platinum wire temperature sensing element is H-grade material. The cable is characterized by aiming at the working condition of a generatorThe cable with special design is made of extrusion-grade PI (polyimide), the long-term temperature resistance is more than or equal to 230 ℃, the specific strength is up to 176MPa, the tensile strength is more than or equal to 80MPa, and the tensile strength is 3-4 times of fluoroplastic. The extrusion grade PI (polyimide) material is selected from at least one of PL450C, PL400C, CP-8000, preferably PL450C. When the lead of the temperature sensor is taken out of the shell, a fluorine rubber heat shrinkage tube is adopted for protection, the long-term temperature resistance is 190-200 ℃, the flame retardant level VW-1, the thermal aging elongation at break is more than or equal to 200%, and the dielectric strength is more than or equal to 7.9KV/mm.
Comparative example 1: the specific implementation mode of the processing method of the generator stator temperature sensor is the same as that of the embodiment 1, and is different in that the diameter of the platinum wire is 0.03mm, the alpha coefficient is 0.003846-0.003856, and the natural mica with the thickness of 0.5mm is used as a framework material. The glue for packaging the platinum wire winding element is epoxy resin glue.
Comparative example 2: the processing method of the generator stator temperature sensor comprises the following implementation steps:
(1) Winding a platinum wire on an insulating framework made of a polyimide insulating plate by adopting a double winding method to form a circuit element with turn-to-turn insulation;
(2) Respectively welding 0.4mm silver wires on the tail ends of the platinum wires, and carrying out tolerance grade adjustment calibration in a constant temperature tank at 0 ℃;
(3) The temperature sensing element with the A-level precision after the adjustment calibration is packaged in an inner shell made of an epoxy glass cloth laminated board by silica gel to form a miniaturized temperature sensing element, and the temperature sensing element is manufactured into a product for secondary packaging in the later stage;
(4) A special cable is processed for a lead wire of a sensor aiming at the temperature measuring part of a large-sized generator stator.
(5) And after the temperature sensing element and the cable are welded, the temperature sensing element and the cable are packaged in an outer shell body processed by a final epoxy glass cloth laminated board, and a part of the lead coming out of the outer shell body is protected from broken wires by adopting a fluorine rubber heat-shrinkable tube.
The diameter of the platinum wire is 0.04mm, and the alpha coefficient is 0.003851-0.003856; the thickness of the polyimide insulating plate is 0.3-0.4mm. The coiling method of the platinum wire is a double-coiling methodThe inter-turn spacing of the wire is 0.5mm, and the purity of the silver wire welded at the tail end of the platinum wire is 99.99%. The silica gel for packaging the platinum wire wound element is heat-conducting insulating silica gel, and has long-term temperature resistance of 190-200 ℃ and volume resistivity of more than or equal to 1 multiplied by 10 15 Omega cm, the thermal conductivity is more than or equal to 1.3 (W/m.k). And the insulating grade of the epoxy glass cloth laminated board for packaging the platinum wire temperature sensing element is H-grade material. The cable insulation material adopts fluoroplastic. When the lead of the temperature sensor is taken out of the shell, a fluorine rubber heat shrinkage tube is adopted for protection, the long-term temperature resistance is 190-200 ℃, the flame retardant level VW-1, the thermal aging elongation at break is more than or equal to 200%, and the dielectric strength is more than or equal to 7.9KV/mm.
Comparative example 3: the specific implementation mode of the processing method of the stator temperature sensor of the large-sized generator is the same as that of the embodiment 1, and is different in that glue for packaging the platinum wire winding element is common silicon non-heat-conducting silica gel, and the extrusion-grade PI (polyimide) material is CP-8000.
Performance test method
1. Precision: the accuracy provided by examples and comparative examples was tested according to IEC60751-2008 standard, the test results being specifically recorded in table 1;
2. thermal response time: the thermal response times provided by the examples and comparative examples were tested in accordance with JB/T8622-1997 standard, clause 5.5, the test results being specifically recorded in Table 1.
3. Volume resistivity: the volume resistivity provided by the examples and comparative examples was tested according to ASTM D257 and the test results are specifically recorded in table 1.
4. Tensile strength: the insulated cables provided in examples and comparative examples were subjected to tensile strength tests according to IEC60811-1-1:2001 using a specialized tensile machine, and the test results are recorded in Table 1.
Table 1 test results table for each of examples and comparative examples
In addition, a second aspect of the invention provides a generator stator temperature sensor, which is manufactured by the method for manufacturing the generator stator temperature sensor.
In summary, the invention provides a temperature sensor for a stator of a generator and a processing method thereof, the method comprises the steps of manufacturing an insulation framework with symmetrical sawtooth winding parts at two side edges of a front section and 2 rows of preset threading holes in two sides of a rear section by using polyimide insulation plates; winding a platinum wire on the symmetrical sawtooth winding part by adopting a double winding method, and enabling two connecting ends of the platinum wire to respectively pass through 1 row of preset threading holes to respectively corresponding preset welding positions; welding silver wires on the two connecting ends at the corresponding preset welding positions to obtain a temperature sensing circuit core, and packaging the temperature sensing circuit core in an inner shell of the epoxy glass cloth laminated board by using silica gel for one time to obtain a temperature sensing element; performing tolerance grade adjustment calibration on the temperature sensing element in the constant temperature tank to obtain a temperature sensing element finished product; and connecting a silver wire of a temperature sensing element finished product with a lead cable, and then secondarily packaging the silver wire in an outer shell of the epoxy glass cloth laminated board by using silica gel to obtain the generator stator temperature sensor. The processing method is simple and high in efficiency, and the reliability of the device is improved.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (2)
1. The processing method of the generator stator temperature sensor is characterized by comprising the following steps of:
the method comprises the steps of manufacturing an insulating framework with symmetrical sawtooth winding parts at the edges of two sides of a front section and 2 rows of preset threading holes in the two sides of a rear section by taking a polyimide insulating plate as a raw material;
winding a platinum wire on the symmetrical sawtooth winding part of the insulating framework by adopting a double winding method, enabling two connecting ends of the platinum wire to respectively pass through 1 row of preset threading holes to respectively corresponding preset welding positions, wherein the diameter of the platinum wire is 0.04mm, the alpha coefficient of the platinum wire is 0.003851-0.003856, the inter-turn spacing of the platinum wire on the symmetrical sawtooth winding part is 0.5mm, and the thickness of the insulating framework is 0.3-0.4mm;
welding silver wires on the two connecting ends at the preset welding positions respectively to obtain a temperature sensing circuit core, wherein the diameter of each silver wire is 0.4mm, and the purity of each silver wire is 99.99%;
the temperature sensing circuit core is packaged in an inner shell made of an epoxy glass cloth laminated board at one time by using silica gel, and the silver wire is exposed from one end, so that a temperature sensing element is obtained, the silica gel is heat-conducting insulating silica gel, the heat-resistant temperature of the heat-conducting insulating silica gel is 190-200 ℃, and the volume resistivity of the heat-conducting insulating silica gel is more than or equal to 1 multiplied by 10 15 Omega cm, wherein the thermal conductivity of the heat-conducting insulating silica gel is more than or equal to 1.3 (W/m.k);
performing tolerance grade adjustment calibration on the temperature sensing element in a constant temperature tank to obtain a temperature sensing element finished product, wherein the temperature of the constant temperature tank is 0 ℃, and the precision grade of the temperature sensing element finished product is grade A;
connecting the silver wire of the temperature sensing element finished product with a lead cable, and then secondarily packaging the silver wire in an outer shell made of an epoxy glass cloth laminated board by using silica gel, wherein the insulation grade of the epoxy glass cloth laminated board is H grade, the insulation material of the lead cable is extrusion grade polyimide, the temperature resistance temperature of the extrusion grade polyimide is more than or equal to 230 ℃, the specific strength of the extrusion grade polyimide is more than or equal to 176MPa, and the tensile strength of the extrusion grade polyimide is more than or equal to 80MPa;
the front section of the leading cable extending into the outer shell is protected from broken wires by adopting a fluorine rubber heat shrinkage pipe, the temperature resistance of the fluorine rubber heat shrinkage pipe is 190-200 ℃, the flame retardant level of the fluorine rubber heat shrinkage pipe is VW-1 level, the heat aging elongation at break of the fluorine rubber heat shrinkage pipe is more than or equal to 200%, and the dielectric strength of the fluorine rubber heat shrinkage pipe is more than or equal to 7.9KV/mm, so that the generator stator temperature sensor is obtained.
2. A generator stator temperature sensor, characterized in that the generator stator temperature sensor is manufactured by the method for manufacturing the generator stator temperature sensor according to claim 1.
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