CN103197708B - A kind of temperature control system of analogue transformer preparation device for standard oil sample - Google Patents
A kind of temperature control system of analogue transformer preparation device for standard oil sample Download PDFInfo
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- CN103197708B CN103197708B CN201310101286.8A CN201310101286A CN103197708B CN 103197708 B CN103197708 B CN 103197708B CN 201310101286 A CN201310101286 A CN 201310101286A CN 103197708 B CN103197708 B CN 103197708B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 19
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- 239000004973 liquid crystal related substance Substances 0.000 claims description 22
- 239000013078 crystal Substances 0.000 claims description 10
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- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 4
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- 229920005830 Polyurethane Foam Polymers 0.000 claims description 2
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- 206010020843 Hyperthermia Diseases 0.000 description 1
- 206010044565 Tremor Diseases 0.000 description 1
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Abstract
The present invention relates to a kind of temperature control system of analogue transformer preparation device for standard oil sample.The present invention includes ebullator, oil circulation pipeline, oil tank and solenoid valve, it is characterized in that it also comprises oil tank heating tape, oil line pipe heater strip, Tube Temperature Sensor, temperature controller, heat-insulation layer and oil tank temperature sensor; Described oil tank heating tape uniform winding is on oil cylinder outer wall, and described heat-insulation layer is coated on the outside of oil tank and oil circulation pipeline respectively; Described ebullator and solenoid valve are arranged on oil circulation pipeline; Described temperature sensor is arranged in oil circulation pipeline; Described temperature controller is communicated with the host computer that control software design is housed by bluetooth or USB.Advantage of the present invention realizes heating, thermometric, temperature control integration and automatically controls, and for the mixing of preparation device for standard oil sample gas-liquid two-phase provides equilibrium temperature environment, makes oil path heating even, prevent oil temperature local overheating generation cracking in heating process.
Description
Technical field
The present invention relates to a kind of temperature control system of analogue transformer preparation device for standard oil sample, be mainly used in homogeneous heating and the insulation of the oil sample device for formulating of dissolved gas.
Background technology
At present, to the detection of Gases Dissolved in Transformer Oil on-Line Monitor Device, the laboratory gas chromatography that existing power industry inspection specification is recommended, checkout procedure is long, operating process is loaded down with trivial details, man-made chamber error is more, be not suitable for carrying out field-checking.Domestic for after Gases Dissolved in Transformer Oil on-Line Monitor Device in-site installation, how to assess this system monitoring validity, and systems axiol-ogy validity after long-play, there is not yet respective rules to put into effect, many on-Line Monitor Device are checked Specifications before just installing at the scene, substantially do not carry out inspection to its monitoring validity after installation, these problems have become the bottleneck of on-line monitoring system development.
Design the device of a kind of particular formulation certain characteristic gas content transformer oil, transformer oil characteristic gas is mixed with certain proportioning with transformer oil, the sample oil of its preparation measures its concentration data close to its theoretical concentration through laboratory chromatographs, can using the oil sample of preparation as standard oil sample, be directly used in the calibration operation of oil dissolved gas on-Line Monitor Device, with the standard oil sample of well-known theory concentration for standard substance, realize the verification to on-Line Monitor Device, do not need to do laboratory chromatographs again and demarcate contrast.
According to " Measurement Law of the People's Republic of China " regulation, standard substance is is principal character with the stability, uniformity of value and accuracy.Transformer insulation oil standard oil sample process for preparation is the principle utilizing gas-liquid two-phase dissolution equilibrium, and temperature directly has influence on the solute effect of characteristic gas in oil, and temperature is high, and gas component concentrations is large; Temperature is low, and gas component concentrations is low, and the height shakiness of temperature must cause the content concn of characteristic gas in oil unstable.Conventional heater element can select powerful heater element, such as heating rod, and its rate of heat addition is high, the temperature increase to insulating oil can be realized fast, but need to be posted on outside fuel tank during assembling, owing to being that contact area is little, the easy short time forms local overheating because of heat accumulation.Thermal decomposition effect can be there is when insulating oil temperature reaches 100 DEG C, discharge the gas composition that can affect testing result.So this kind of type of heating should not be used for the heating of insulating oil.Because standard oil thermal capacity requires comparatively large, if select low-power heater element, heating power is little, and firing rate is slow, affects work efficiency, also should not be used for the heating material of insulating oil.So the instability of insulating oil temperature and localized hyperthermia, the insulating oil that can cause, as the deviation of standard substance, directly affects the check results of on-Line Monitor Device.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of temperature control system of analogue transformer preparation device for standard oil sample, and the standard oil sample produced is mainly used in the verification of transformer chromatogram monitoring device.
The present invention adopts following technical scheme:
The present invention includes ebullator, oil circulation pipeline, oil tank and solenoid valve, it is characterized in that it also comprises oil tank heating tape, oil line pipe heater strip, Tube Temperature Sensor, temperature controller, heat-insulation layer and oil tank temperature sensor; Described oil tank heating tape uniform winding is on oil tank outer wall, and it is outside that described heat-insulation layer is coated on the oil tank after being wound around by oil tank heating tape, and described heat-insulation layer is also coated on the oil circulation pipeline external after being wound around by oil line pipe heater strip; Described oil circulation pipeline connects oil tank upper end oil-in and lower end oil-out; Described ebullator and solenoid valve are arranged on oil circulation pipeline; Described Tube Temperature Sensor is installed in oil circulation pipeline; Described temperature controller is communicated with the host computer that control software design is housed by bluetooth or USB;
Described temperature controller comprises single chip machine controlling circuit, I/O driving circuit, A/D converter, liquid crystal display circuit and communication module; The output terminal of described A/D converter connects the respective input of single chip machine controlling circuit, and the corresponding output end of described single chip machine controlling circuit connects the input end of I/O driving circuit and liquid crystal display circuit respectively; Described communication module and single chip machine controlling circuit are bi-directionally connected; The respective input of described A/D converter connects the output terminal of Tube Temperature Sensor and oil tank temperature sensor respectively, and the output terminal of described I/O driving circuit controls the break-make of oil tank heating tape, ebullator, oil line pipe heater strip, solenoid valve respectively.
The beneficial effect that the present invention produces is: by oil tank heating tape, oil line pipe heater strip, heat-insulation layer and oil tank temperature sensor realize heating, heat radiation, insulation, utilize Tube Temperature Sensor thermometric, realize temperature control integration in conjunction with temperature controller and automatically control, for the mixing of preparation device for standard oil sample gas-liquid two-phase provides equilibrium temperature environment, oil tank heating tape makes oil path heating even, prevent oil temperature local overheating generation cracking in heating process, ensure that the accuracy of standard oil, avoid the systematic error that Gases Dissolved in Transformer Oil on-Line Monitor Device causes because of oil temperature difference.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the circuit theory block figure of temperature controller in the present invention;
Fig. 3 is the circuit theory diagrams (single chip machine controlling circuit, display circuit) of temperature controller in the present invention;
Fig. 4 is the circuit theory diagrams (I/O driving circuit) of temperature controller in the present invention;
The circuit theory diagrams (A/D converter) of temperature controller in Fig. 5 the present invention;
The circuit theory diagrams (communication module) of temperature controller in Fig. 6 the present invention.
Wherein, 1 oil tank heating tape, 2 ebullators, 3 oil line pipe heater strips, 4 oil circulation pipelines, 5 Tube Temperature Sensors, 6 oil tanks, 7 temperature controllers, 8 heat-insulation layers, 9 oil tank temperature sensors, 10 solenoid valves.Solid line in Fig. 1 represents oil circulation pipeline, dot-and-dash line representation signal.
Embodiment
From the embodiment shown in Fig. 1 ~ 6, it comprises ebullator 2, oil circulation pipeline 4, oil tank 6 and solenoid valve 10, it is characterized in that it also comprises oil tank heating tape 1, oil line pipe heater strip 3, Tube Temperature Sensor 5, temperature controller 7, heat-insulation layer 8 and oil tank temperature sensor 9; Described oil tank heating tape 1 uniform winding is on oil cylinder outer wall, and described heat-insulation layer 8 is coated on the outside of the oil tank 6 after being wound around by oil tank heating tape 1 and oil line pipe heater strip 3 and oil circulation pipeline 4 respectively; Described oil circulation pipeline 4 connects oil tank 6 upper end oil-in and lower end oil-out; Described ebullator 2 and solenoid valve 10 are arranged on oil circulation pipeline 4; Described Tube Temperature Sensor 5 is installed in oil circulation pipeline 4; Described temperature controller 7 is communicated with the host computer that control software design is housed by bluetooth or USB;
Described temperature controller 7 comprises single chip machine controlling circuit, I/O driving circuit, A/D converter, liquid crystal display circuit and communication module; The output terminal of described A/D converter connects the respective input of single chip machine controlling circuit, and the corresponding output end of described single chip machine controlling circuit connects the input end of I/O driving circuit and liquid crystal display circuit respectively; Described communication module and single chip machine controlling circuit are bi-directionally connected; The respective input of described A/D converter connects the output terminal of Tube Temperature Sensor 5 and oil tank temperature sensor 9 respectively, and the output terminal of described I/O driving circuit controls the break-make of oil tank heating tape 1, ebullator 2, oil line pipe heater strip 3, solenoid valve 10 respectively.
Described single chip machine controlling circuit is made up of single-chip microcomputer U4 and peripheral component crystal oscillator Y1, electric capacity C1 ~ C3, resistance R1, exclusion RP1; Described crystal oscillator Y1 is connected between 18 and 19 pin of single-chip microcomputer U4, and electric capacity C1 is connected between 18 pin of single-chip microcomputer U4 and ground, and electric capacity C2 is connected between 19 pin of single-chip microcomputer U4 and ground; Electric capacity C3 and resistance R1 is connected between+5V VDD-to-VSS after connecting, and 9 pin of single-chip microcomputer U4 are connected on the node of electric capacity C3 and resistance R1, composition automatic reset circuit; 32 ~ 39 pin of single-chip microcomputer U4 run in successively and hinder 9 ~ 2 pin of RP1, and 40 pin of single-chip microcomputer U4 and 1 pin of exclusion RP1 all meet+5V.
Described liquid crystal display circuit hinders R3 by Liquid Crystal Module U3 and peripheral component resistance R2 thereof, slip power transformation and forms; Described resistance R2 and slip power transformation are connected between 18 ~ 19 pin of Liquid Crystal Module U3 after hindering R3 series connection, 3 pin of Liquid Crystal Module U3 connect the sliding end of slide rheostat R3,7 ~ 14 pin of Liquid Crystal Module U3 connect 39 ~ 32 pin of single-chip microcomputer U4 successively, 2 pin of Liquid Crystal Module U3 meet+5V, 1 pin of Liquid Crystal Module U3 and 20 pin ground connection.
Described I/O driving circuit is made up of Darlington array U2 and peripheral component relay J 1 ~ J3, socket Z1 ~ Z4, described oil line pipe heater strip 3 is connected between 1 pin of socket Z1 and 5 pin, and described oil tank heating tape 1 is connected between 1 pin of socket Z2 and 5 pin, and described ebullator 2 is connected between 1 pin of socket Z3 and 5 pin, and described solenoid valve 10 is connected between 1 pin of socket Z4 and 2 pin, 1 ~ 7 pin of described Darlington array U2 connects 21 ~ 27 pin of single-chip microcomputer U4 successively, 14 ~ 16 pin of Darlington array U2 connect ebullator 2 respectively, the control relay circuit of oil tank heating tape 1 and oil line pipe heater strip 3, wherein, the control relay circuit of ebullator 2 comprises relay J 3 and socket Z3, between 14 pin that the coil of described relay J 3 is connected on Darlington array U2 and+5V, the normally opened contact J3-3 of relay J 3 is connected between 3 pin of socket Z3 and 5 pin, 2 pin of socket Z3 are connected with 3 pin integrally pin, 1 pin of socket Z3 is connected with 4 pin integrally pin, above-mentioned two overall pins after connection connect 220V alternating current, oil tank heating tape 1 is identical with the structure of the control relay circuit of ebullator 2 with the structure of the control relay circuit of oil line pipe heater strip 3, 2 ~ 5 pin of socket Z4 connect 13 ~ 10 pin of Darlington array U2, and 1 pin of socket Z4 meets+24V, the 8 pin ground connection of Darlington array U2,9 pin of Darlington array U2 meet+5V.
Described A/D converter is made up of integrated package U6 and peripheral component crystal oscillator Y2, electric capacity C4 ~ C8, resistance R4 ~ R5, socket Z5 ~ Z6; Three output terminals of described oil circuit temperature sensor 5 connect between 1 ~ 3 pin of Z5 respectively, and three output terminals of described oil tank temperature sensor 9 connect between 1 ~ 3 pin of Z6 respectively; 1 pin of described integrated package U6 connects 1 pin of single-chip microcomputer U4,14 ~ 12 pin corresponding 13 pin, 3 pin, 2 pin meeting single-chip microcomputer U4 respectively of integrated package U6, and 5 pin of integrated package U6 meet+5V, 4 pin of integrated package U6,6 pin, 8 pin, 10 pin, 11 pin ground connection; 2 pin of described socket Z5 ~ Z6 connect 6 ~ 7 pin of integrated package U6 respectively, and 1 pin of socket Z5 ~ Z6 meets+5V, 3 pin ground connection; Described crystal oscillator Y2 is connected between 2 pin of integrated package U6 and 3 pin, and electric capacity C4 is connected between 2 pin of integrated package U6 and ground, and electric capacity C5 is connected between 3 pin of integrated package U6 and ground; Electric capacity C6 is connected between+5V VDD-to-VSS, and resistance R4 ~ R5 is connected between+5V VDD-to-VSS after connecting, and 9 pin of integrated package U6 are connected on the node of R4 and R5, are connected between the node of R4 and R5 and ground after electric capacity C7 ~ C8 parallel connection, the 10 pin ground connection of integrated package U6.
Described communication module is made up of bluetooth integrated package U1, USB integrated package U5 and double-point double-throw switch S1; 2 stationary contacts of described double-point double-throw switch S1 connect 10 pin, 11 pin of single-chip microcomputer U4,2 ~ 3 pin of the swing arm selectivity access bluetooth integrated package U1 or USB integrated package U5 of double-point double-throw switch S1; 1 pin of described bluetooth integrated package U1 and USB integrated package U5 all meets+5V, the equal ground connection of its 4 pin.
Described oil tank heating tape 1 and the oil line pipe heater strip 3 flat belt-like thing all for being made up of thermo electric material and insulating material, described thermo electric material is nickel-chrome, and described insulating material is multilayer alkali-free glass fibre; Described heat-insulation layer 8 is hard polyurethane foams.
Described Tube Temperature Sensor 5 and oil tank temperature sensor 9 are platinum resistance formula sensor.
In the present embodiment, the model of described composite crystal array U2 is ULN2003A (16); The model of described Liquid Crystal Module U3 is SMG12864; The model of described single-chip microcomputer U4 is AT89c51; The model of described integrated package U6 is AD7705; The model of described bluetooth integrated package U1 is GC-04; The model of described USB integrated package U5 is ZF-23V4.0; Described oil tank heating tape is the temp auto-controlled heated at constant temperature ribbon that maximum temperature can reach 70 DEG C.
A kind of rate-determining steps of temperature control system of analogue transformer preparation device for standard oil sample is as follows:
(1) set constant temperature value described being equipped with in the host computer of control software design, the constant temperature value of setting is sent to temperature controller 7 by bluetooth or USB by host computer;
(2) according to the temperature control program in the single chip machine controlling circuit in temperature controller 7, pilot relay switching frequency, thus the heat time of adjustment oil tank heating tape 1 and oil line pipe heater strip 3, controlled circulation pump 2, solenoid valve 10 work, A/D converter receiving pipeline temperature sensor 5 simultaneously in temperature controller 7 and the value of feedback of oil tank temperature sensor 9, the single chip machine controlling circuit in input temp controller 7;
(3) on off state of each relay can be shown in the LCDs in thermostat module temperature controller 7.
Claims (8)
1. the temperature control system of an analogue transformer preparation device for standard oil sample, it comprises ebullator (2), oil circulation pipeline (4), oil tank (6) and solenoid valve (10), it is characterized in that it also comprises oil tank heating tape (1), oil line pipe heater strip (3), Tube Temperature Sensor (5), temperature controller (7), heat-insulation layer (8) and oil tank temperature sensor (9); Described oil tank heating tape (1) uniform winding is on oil tank (6) outer wall, it is outside that described heat-insulation layer (8) is coated on the oil tank (6) after being wound around by oil tank heating tape (1), and it is outside that described heat-insulation layer (8) is also coated on the oil circulation pipeline (4) after being wound around by oil line pipe heater strip (3); Described oil circulation pipeline (4) connects oil tank (6) upper end oil-in and lower end oil-out; Described ebullator (2) and solenoid valve (10) are arranged on oil circulation pipeline (4); Described Tube Temperature Sensor (5) is installed in oil circulation pipeline (4); Described temperature controller (7) is communicated with the host computer that control software design is housed by bluetooth or USB;
Described temperature controller (7) comprises single chip machine controlling circuit, I/O driving circuit, A/D converter, liquid crystal display circuit and communication module; The output terminal of described A/D converter connects the respective input of single chip machine controlling circuit, and the corresponding output end of described single chip machine controlling circuit connects the input end of I/O driving circuit and liquid crystal display circuit respectively; Described communication module and single chip machine controlling circuit are bi-directionally connected; The respective input of described A/D converter connects the output terminal of Tube Temperature Sensor (5) and oil tank temperature sensor (9) respectively, and the output terminal of described I/O driving circuit controls the break-make of oil tank heating tape (1), ebullator (2), oil line pipe heater strip (3), solenoid valve (10) respectively.
2. the temperature control system of a kind of analogue transformer preparation device for standard oil sample according to claim 1, is characterized in that described single chip machine controlling circuit is made up of single-chip microcomputer U4 and peripheral component crystal oscillator Y1, electric capacity C1 ~ C3, resistance R1, exclusion RP1; Described crystal oscillator Y1 is connected between 18 and 19 pin of single-chip microcomputer U4, and electric capacity C1 is connected between 18 pin of single-chip microcomputer U4 and ground, and electric capacity C2 is connected between 19 pin of single-chip microcomputer U4 and ground; Electric capacity C3 and resistance R1 is connected between+5V VDD-to-VSS after connecting, and 9 pin of single-chip microcomputer U4 are connected on the node of electric capacity C3 and resistance R1, composition automatic reset circuit; 32 ~ 39 pin of single-chip microcomputer U4 run in successively and hinder 9 ~ 2 pin of RP1, and 40 pin of single-chip microcomputer U4 and 1 pin of exclusion RP1 all meet+5V; The model of described single-chip microcomputer U4 is AT89c51.
3. the temperature control system of a kind of analogue transformer preparation device for standard oil sample according to claim 2, is characterized in that described liquid crystal display circuit hinders R3 by Liquid Crystal Module U3 and peripheral component resistance R2 thereof, slip power transformation and forms; Described resistance R2 and slip power transformation are connected between 18 ~ 19 pin of Liquid Crystal Module U3 after hindering R3 series connection, 3 pin of Liquid Crystal Module U3 connect the sliding end of slide rheostat R3,7 ~ 14 pin of Liquid Crystal Module U3 connect 39 ~ 32 pin of single-chip microcomputer U4 successively, 2 pin of Liquid Crystal Module U3 meet+5V, 1 pin of Liquid Crystal Module U3 and 20 pin ground connection; The model of described Liquid Crystal Module U3 is SMG12864.
4. the temperature control system of a kind of analogue transformer preparation device for standard oil sample according to claim 3, is characterized in that described I/O driving circuit is made up of Darlington array U2 and peripheral component relay J 1 ~ J3, socket Z1 ~ Z4, described oil line pipe heater strip (3) is connected between 1 pin of socket Z1 and 5 pin, described oil tank heating tape (1) is connected between 1 pin of socket Z2 and 5 pin, described ebullator (2) is connected between 1 pin of socket Z3 and 5 pin, and described solenoid valve (10) is connected between 1 pin of socket Z4 and 2 pin, 1 ~ 7 pin of described Darlington array U2 connects 21 ~ 27 pin of single-chip microcomputer U4 successively, 14 ~ 16 pin of Darlington array U2 connect ebullator (2) respectively, the control relay circuit of oil tank heating tape (1) and oil line pipe heater strip (3), wherein, the control relay circuit of ebullator (2) comprises relay J 3 and socket Z3, between 14 pin that the coil of described relay J 3 is connected on Darlington array U2 and+5V, the normally opened contact J3-3 of relay J 3 is connected between 3 pin of socket Z3 and 5 pin, 2 pin of socket Z3 are connected with 3 pin integrally pin, 1 pin of socket Z3 is connected with 4 pin integrally pin, above-mentioned two overall pins after connection connect 220V alternating current, oil tank heating tape (1) is identical with the structure of the control relay circuit of ebullator (2) with the structure of the control relay circuit of oil line pipe heater strip (3), 2 ~ 5 pin of socket Z4 connect 13 ~ 10 pin of Darlington array U2, and 1 pin of socket Z4 meets+24V, the 8 pin ground connection of Darlington array U2,9 pin of Darlington array U2 meet+5V, the model of described composite crystal array U2 is ULN2003A (16).
5. the temperature control system of a kind of analogue transformer preparation device for standard oil sample according to claim 4, is characterized in that described A/D converter is made up of integrated package U6 and peripheral component crystal oscillator Y2, electric capacity C4 ~ C8, resistance R4 ~ R5, socket Z5 ~ Z6; Three output terminals of described oil circuit temperature sensor (5) connect 1 ~ 3 pin of Z5 respectively, between 1 ~ 3 pin of three output terminals difference combination hub Z6 of described oil tank temperature sensor (9); 1 pin of described integrated package U6 connects 1 pin of single-chip microcomputer U4,14 ~ 12 pin corresponding 13 pin, 3 pin, 2 pin meeting single-chip microcomputer U4 respectively of integrated package U6, and 5 pin of integrated package U6 meet+5V, 4 pin of integrated package U6,6 pin, 8 pin, 10 pin, 11 pin ground connection; 2 pin of described socket Z5 ~ Z6 connect 6 ~ 7 pin of integrated package U6 respectively, and 1 pin of socket Z5 ~ Z6 meets+5V, 3 pin ground connection; Described crystal oscillator Y2 is connected between 2 pin of integrated package U6 and 3 pin, and electric capacity C4 is connected between 2 pin of integrated package U6 and ground, and electric capacity C5 is connected between 3 pin of integrated package U6 and ground; Electric capacity C6 is connected between+5V VDD-to-VSS, and resistance R4 ~ R5 is connected between+5V VDD-to-VSS after connecting, and 9 pin of integrated package U6 are connected on the node of R4 and R5, are connected between the node of R4 and R5 and ground after electric capacity C7 ~ C8 parallel connection, the 10 pin ground connection of integrated package U6; The model of described integrated package U6 is AD7705.
6. the temperature control system of a kind of analogue transformer preparation device for standard oil sample according to claim 5, is characterized in that described communication module is made up of bluetooth integrated package U1, USB integrated package U5 and double-point double-throw switch S1; 2 stationary contacts of described double-point double-throw switch S1 connect 10 pin, 11 pin of single-chip microcomputer U4,2 ~ 3 pin of the swing arm selectivity access bluetooth integrated package U1 or USB integrated package U5 of double-point double-throw switch S1; 1 pin of described bluetooth integrated package U1 and USB integrated package U5 all meets+5V, the equal ground connection of its 4 pin; The model of described bluetooth integrated package U1 is GC-04, and the model of described USB integrated package U5 is ZF-23V4.0.
7. the temperature control system of a kind of analogue transformer preparation device for standard oil sample according to claim 6, it is characterized in that described oil tank heating tape (1) and the flat belt-like thing of oil line pipe heater strip (3) all for being made up of thermo electric material and insulating material, described thermo electric material is nickel-chrome, and described insulating material is multilayer alkali-free glass fibre; Described heat-insulation layer (8) is hard polyurethane foams.
8. the temperature control system of a kind of analogue transformer preparation device for standard oil sample according to claim 7, is characterized in that described Tube Temperature Sensor (5) and oil tank temperature sensor (9) are platinum resistance formula sensor.
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| CN103458664A (en) * | 2013-09-06 | 2013-12-18 | 重庆创思特科技有限公司 | Circulating liquid type self-sensing optimal temperature circuit board protecting device |
| CN105891834A (en) * | 2016-03-30 | 2016-08-24 | 河南师范大学 | Indoor supersonic position indicator |
| CN106241611B (en) * | 2016-08-31 | 2017-11-03 | 润邦卡哥特科工业有限公司 | A kind of hydraulic system starting protection device suitable for worst cold case |
| CN106546686B (en) * | 2016-11-21 | 2019-03-01 | 国网山东省电力公司电力科学研究院 | Using the preparation method of the device for formulating of oil dissolved gas on-line monitoring system verification standard oil |
| CN108760090B (en) * | 2018-05-28 | 2020-04-10 | 深圳友讯达科技股份有限公司 | Simulated environment temperature testing device |
| CN111038858B (en) * | 2019-09-30 | 2020-11-27 | 浩联保温管业有限公司 | Constant temperature circulation feeding system |
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