CN203480333U - Mining frequency converter humidity controller - Google Patents
Mining frequency converter humidity controller Download PDFInfo
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- CN203480333U CN203480333U CN201320511498.9U CN201320511498U CN203480333U CN 203480333 U CN203480333 U CN 203480333U CN 201320511498 U CN201320511498 U CN 201320511498U CN 203480333 U CN203480333 U CN 203480333U
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Abstract
The utility model provides a mining frequency converter humidity controller comprising a humiture sensor used for collecting the temperature and humidity information in the frequency converter, a condensation sensor used for condensation detection in the frequency converter, a heating device for fast drying when the humidity in the frequency converter exceeds a set limit value or condensation is generated, and a controller used for receiving and processing the detection signals sent by the humiture sensor and the condensation sensor and controlling the work state of the heating device. The humiture sensor and the condensation sensor are both in signal electrical connection with the controller; the controller and the heating device are in control signal electric connection; in usage, the controller is also in control signal electric connection with a PLC of the frequency converter. The mining frequency converter humidity controller is simple in structure, low in cost, convenient in installation and usage, high in work reliability, good in stability, can effectively prevent inside condensation of the frequency converter, thereby effectively protecting the frequency converter and preventing the frequency converter from work failure or being damaged by the condensation.
Description
Technical field
The utility model relates to the protective device of mine-used frequency-converter, is specifically related to a kind of humidity conditioner of mine-used frequency-converter.
Background technology
In recent years, variable-frequency control technique is developed rapidly as an energy-conservation emphasis disseminate technology of China.Mine-used frequency-converter adapts to the energy-conservation and safety in production requirement in colliery, in ore deposit underground belt conveyer, hoister, blower fan, water pump and scraper conveyor even load occasion, is more and more applied.But, fairly obvious on the impact of frequency converter serviceability such as rugged surroundings such as large, the easy dewfall of air humidity under mine, the large power, electrically sub-element of frequency converter inside, very easily be subject to the impact of surrounding environment, special change is the in the situation that of dewfall, its built-in electrical insulation performance reduces greatly, easily produce high-voltage arc, thereby cause frequency converter to damage, special change is in summer, and the humidity under coal mine can reach more than 90%, and the quantity that mine-used frequency-converter damages because of dewfall obviously increases, the normal production ，Gei enterprise that has a strong impact on enterprise causes larger economic loss.Therefore, the humiture of mine-used frequency-converter inside monitored in real time and processed, preventing that mine-used frequency-converter from, because internal condensation causes work undesired or damage, seeming very necessary.
Utility model content
The purpose of this utility model is: overcome the deficiencies in the prior art, provide a kind of simple in structure, cost is lower, easy to use, can effectively overcome mine-used frequency-converter and cause the undesired mine-used frequency-converter humidity conditioner even damaging of work because of moist, dewfall.
The technical solution of the utility model is: mine-used frequency-converter humidity conditioner of the present utility model, and its design feature is: comprising:
Temperature Humidity Sensor, for gathering the temperature and humidity information in frequency converter;
Condensation sensor, for detection of dewfall whether in frequency converter;
Heating arrangement, dries when the limit value of surpass setting for humidity in frequency converter or dewfall fast;
Controller, for receiving and process the detection signal of Temperature Humidity Sensor and condensation sensor transmission and the duty of heating arrangement being implemented to control;
Above-mentioned Temperature Humidity Sensor and condensation sensor are all electrically connected to controller signals; Controller is electrically connected to heating arrangement control signal; During use, controller is also electrically connected to the PLC control signal of frequency converter.
Further scheme is: above-mentioned controller comprises:
Single chip processing module, controls for information processing and enforcement;
Temperature-humidity signal acquisition module, for gathering the signal of Temperature Humidity Sensor transmission, and is transferred to single chip processing module by the signal of collection;
Dewfall signal input interface, is electrically connected to the signal of single chip processing module for condensation sensor;
Heating arrangement control module, for accepting the steering order of single chip processing module and then the duty of heating arrangement being implemented to control;
Infrared receiving module and telepilot, for carrying out parameter setting to one-chip computer module;
Display screen, for showing humiture information and the dewfall warning message of single chip processing module transmission;
Guard signal output module, for when the frequency converter internal condensation, output alarm signal is also exported lock-in control signal to the PLC in frequency converter simultaneously;
Power module, for providing the working power of controller.
Further scheme is: above-mentioned Temperature Humidity Sensor is arranged on epicoele place anterior in frequency converter; Condensation sensor is provided with 1 to 3 cover; Condensation sensor is arranged on the inwall near transducer power element place; Heating arrangement comprises the heating wire for heating and prevents overheating protection unit overheated in frequency converter.
Further scheme is: the single-chip microcomputer processing unit of above-mentioned controller comprises microprocessor and accessory circuit thereof; The microprocessor of single-chip microcomputer processing unit is the microprocessor of C8051F410 model.
Further scheme is: above-mentioned power module output+5V power supply and+24V power supply; Above-mentioned condensation sensor comprises probe R8, hysteresis comparator U2, triode Q1, diode D2, relay switch K1, resistance R 1, resistance R 2, resistance R 5 and resistance R 9; Hysteresis comparator U2 is the comparer of model LM311, and the probe R8 of condensation sensor is the resistance-type condensation sensor of model HDP-07;
One end conllinear of probe one end of R8, the in-phase input end of hysteresis comparator U2 and resistance R 2; One end conllinear of one end of the inverting input of hysteresis comparator U2, resistance R 1 and resistance R 9; The output terminal of hysteresis comparator U2 is electrically connected to the base stage of triode Q1 by resistance R 5; A terminals conllinear of the winding of the positive pole of the collector of triode Q1, diode D2 and relay switch K1; Another terminals that the power supply of the other end of the other end of resistance R 2, resistance R 1, hysteresis comparator U2 is rectified level, the negative pole of diode D2 and the winding of relay switch K1 form a common junction because of conllinear, this common junction connect power module output+5V power supply; Probe the other end of R8, the power end negative pole of the other end of resistance R 9, hysteresis comparator U2, the emitter-base bandgap grading common ground of the earth terminal of hysteresis comparator U2 and triode Q1.
Further scheme also has: the guard signal output module of above-mentioned controller comprises Schmidt trigger N1A, optocoupler N2, LED 1, triode Q2, diode Q1 and relay switch K2; The model of Schmidt trigger N1A is 74HC14, and the model of optocoupler N2 is TLP521; Schmidt trigger N1A has No. 1 and No. 2 wiring pins, and optocoupler N2 has wiring pin No. 1 to No. 4;
No. 1 wiring pin of Schmidt trigger N1A is for receiving the signal of single chip processing module output; No. 2 wiring pin conllinear of No. 2 wiring pins of Schmidt trigger N1A, the negative pole of LED 1 and optocoupler N2; The positive pole of LED 1 is electrically connected to one end of resistance R 6; No. 1 wiring pin of optocoupler N2 is electrically connected to one end of resistance R 7; The other end of the other end of resistance R 6 and resistance R 7 forms a common junction because of conllinear, this common junction connect power module output+5V power supply; No. 4 wiring pins of optocoupler N2 are electrically connected to the base stage of triode Q2; No. 3 wiring pins of optocoupler N2 and the collector common ground of triode Q2; A terminals conllinear of the winding of the positive pole of the emitter-base bandgap grading of triode Q2, diode D1 and relay switch K2; Another terminals of the winding of the negative pole of diode D1 and relay switch K2 form a common junction because of conllinear, this common junction connect power module output+24V power supply.
The utlity model has positive effect: (1) mine-used frequency-converter humidity conditioner of the present utility model, simple in structure, cost is lower, easy to install and use, functional reliability is high, good stability.(2) mine-used frequency-converter humidity conditioner of the present utility model, its controller Real-time Collection Temperature Humidity Sensor data, by controlling the duty of heating arrangement, guarantee that the dewfall point of frequency converter inner air is all the time lower than environment temperature, thereby can effectively avoid frequency converter internal condensation.(3) mine-used frequency-converter humidity conditioner of the present utility model, when frequency converter is because uncapping or when the drastic change of frequency converter internal-external temperature difference causes frequency converter internal condensation, its controller detects after the block signal of condensation sensor, control frequency converter quits work, open heating arrangement simultaneously and accelerate internal moisture evaporation, and send alarm signal; When controller detects frequency converter internal environment and recovers normal, remove alerting signal, control frequency converter and recover normal operation, thereby can effectively protect frequency converter, because dewfall causes, work is undesired even to be damaged.
Accompanying drawing explanation
Fig. 1 is structural representation block diagram of the present utility model;
Fig. 2 is the structural representation block diagram of Fig. 1 middle controller;
Fig. 3 is the electrical schematic diagram of condensation sensor in Fig. 1;
Fig. 4 is the electrical schematic diagram of the guard signal output module in Fig. 2.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
(embodiment 1)
See Fig. 1, the mine-used frequency-converter humidity conditioner of the present embodiment, is mainly comprised of Temperature Humidity Sensor, condensation sensor, heating arrangement and controller.
Temperature Humidity Sensor is used for gathering the temperature and humidity information in frequency converter, and sends the humiture information data of collection to controller.In Temperature Humidity Sensor the present embodiment, preferably adopt the digital hygro sensor SHT15 of Switzerland Sheng Sirui company.This type sensor is single chip integrated digital hygro sensor, comprise a capacitive character condensate hygrometric sensitive element, a temperature element of making by gap material, and realize seamless link with A/D converter and the serial interface circuit of 14 on same chip.It has, and response is rapid, antijamming capability is strong, cost performance advantages of higher, and each sensor chip is being demarcated in very accurate humidity chamber, and calibration factor is stored in OTP internal memory with program form, for inner signal calibration.The serial line interface of two-wire system and inner voltage adjustment, make integrated the becoming fast of peripheral system and simple.Temperature Humidity Sensor passes through I
2c bus is electrically connected to controller signals; The humiture data-signal of collection is delivered to controller to be processed.During use, Temperature Humidity Sensor is arranged on the epicoele place of frequency converter front portion.
Condensation sensor arranges 1 to 3 cover, preferably adopts 3 covers in the present embodiment.Condensation sensor is for detection of dewfall whether in frequency converter, and in frequency converter being detected, during dewfall, output block signal is to controller.During use, condensation sensor is arranged on the inwall near transducer power element place.
Heating arrangement is mainly comprised of heating wire and overheating protection unit, and the duty of heating arrangement is controlled by the controller.The overheating protection unit of heating arrangement is used for controlling heating-up temperature, and when the excess Temperature of heating wire, the overheating protection unit of heating arrangement is controlled by the controller and automatically cuts off heating power supply, and when temperature recovers normal, heating wire works again.
See Fig. 2, controller is mainly comprised of temperature-humidity signal acquisition module, dewfall signal input interface, heating arrangement control module, infrared receiving module, telepilot, display screen, guard signal output module and power module.
The signal that the temperature-humidity signal acquisition module of controller transmits for gathering Temperature Humidity Sensor, and the signal of collection is transferred to single chip processing module; Dewfall signal input interface is electrically connected to for the single chip processing module of controller and the signal of condensation sensor; Heating arrangement control module is used for accepting single chip processing module and controls and then control heating arrangement; Infrared receiving module and telepilot are for carrying out parameter setting to one-chip computer module; Display screen is for showing humiture information and the dewfall warning message of single chip processing module transmission; Guard signal output module is for when frequency converter internal condensation, output alarm signal is also exported lock-in control signal to the PLC in frequency converter simultaneously, and the PLC of frequency converter receives and exports control command after this block signal and make frequency converter quit work to protect frequency converter; Power module is for providing working power to other modules of controller, its output+5V power supply VCC and+24V power supply.
The single-chip microcomputer processing unit of controller is mainly comprised of microprocessor (MCU) and accessory circuit thereof.In microprocessor the present embodiment of single-chip microcomputer processing unit, preferably adopt the microprocessor of the C8051F410 model of Silicon Labs company.This type microprocessor instruction executive mode adopts pipeline organization, execution speed, and supreme command execution speed can reach 50MIPS; Resources on Chip is abundant, has FLASH and the 2304 byte ram in slice of 32KB, has Hardware I
2c, enhancement mode UART and Enhanced SPI serial line interface, 4 general 16 bit timing devices and hardware real-time clocks, and backup battery administrative unit.
See Fig. 3, condensation sensor is mainly comprised of probe R8, hysteresis comparator U2, triode Q1, diode D2, relay switch K1, resistance R 1, resistance R 2, resistance R 5 and resistance R 9.In the present embodiment, the preferred LM311 of model of hysteresis comparator U2, it is the resistance-type condensation sensor of HDP-07 that the probe R8 of condensation sensor preferably adopts model, it has high sensitivity, extremely responsive to high humility, when the relative humidity of air is greater than 93%, its resistance value increases fast, and when dewfall, its resistance can reach 1M.
One end conllinear of probe one end of R8, the in-phase input end of hysteresis comparator U2 (No. 2 wiring pins) and resistance R 2; The inverting input of hysteresis comparator U2 (No. 3 wiring pins), one end of resistance R 1 and one end conllinear of resistance R 9; The output terminal of hysteresis comparator U2 (No. 7 wiring pins) is electrically connected to the base stage of triode Q1 by resistance R 5; A terminals conllinear of the winding of the positive pole of the collector of triode Q1, diode D2 and relay switch K1; Another terminals that the power supply of the other end of the other end of resistance R 2, resistance R 1, hysteresis comparator U2 is rectified level (No. 8 wiring pins), the negative pole of diode D2 and the winding of relay switch K1 form a common junction because of conllinear, this common junction connect power module output+5V power supply VCC; The probe other end of R8, the earth terminal (No. 1 wiring pin) of the power end negative pole of the other end of resistance R 9, hysteresis comparator U2 (No. 4 wiring pins), hysteresis comparator U2 and the emitter-base bandgap grading common ground of triode Q1.
The principle of work of condensation sensor is: the voltage at HDP-07 two ends and fixed voltage 0.65V compare by hysteresis comparator U2, when dewfall, HDP-07 resistance sharply increases, make its both end voltage rapidly higher than 0.65V, thereby make hysteresis comparator U2 output high level, passive closure signal is exported in relay switch K1 adhesive.This passive closure signal is transferred to single chip processing module by the dewfall signal input interface of cable via controller, when single chip processing module receives block signal, sends alarm signal, prompting user frequency converter internal condensation.
See Fig. 4, the guard signal output module of controller is comprised of Schmidt trigger N1A, optocoupler N2, LED 1, triode Q2, diode Q1 and relay switch K2.In the present embodiment, the preferred 74HC14 of the model of Schmidt trigger N1A, the model of optocoupler N2 preferably adopts TLP521.Schmidt trigger N1A has No. 1 and No. 2 wiring pins, and optocoupler N2 has wiring pin No. 1 to No. 4;
No. 1 wiring pin of Schmidt trigger N1A is for receiving the signal of single chip processing module output; No. 2 wiring pin conllinear of No. 2 wiring pins of Schmidt trigger N1A, the negative pole of LED 1 and optocoupler N2; The positive pole of LED 1 is electrically connected to one end of resistance R 6; No. 1 wiring pin of optocoupler N2 is electrically connected to one end of resistance R 7; The other end of the other end of resistance R 6 and resistance R 7 forms a common junction because of conllinear, this common junction connect power module output+5V power supply VCC; No. 4 wiring pins of optocoupler N2 are electrically connected to the base stage of triode Q2; No. 3 wiring pins of optocoupler N2 and the collector common ground of triode Q2; A terminals conllinear of the winding of the positive pole of the emitter-base bandgap grading of triode Q2, diode D1 and relay switch K2; Another terminals of the winding of the negative pole of diode D1 and relay switch K2 form a common junction because of conllinear, this common junction connect power module output+24V power supply.
(application examples 1)
Endless rope winch in Shandong use in mines is controlled the mine-used frequency-converter humidity conditioner that embodiment 1 has been installed in frequency converter inside, before and after installing, measured respectively one group of data, as shown in following table 1 and table 2,21 ℃ of environment temperatures during measurement, relative humidity 90%.
Table 1 is installed the data of pre-test
| Time/h | 0 | 3 | 6 | 9 | 12 | 15 | 18 | 21 | 24 |
| Temperature/℃ | 21 | 23 | 26 | 22 | 23 | 25 | 25 | 25 | 24 |
| Humidity/% | 90 | 80 | 68 | 89 | 84 | 75 | 76 | 78 | 84 |
| Dewpoint temperature/℃ | 19.3 | 19.3 | 19.6 | 20.1 | 20.1 | 20.2 | 20.4 | 20.9 | 21.1 |
The data that table 2 is measured after installing
| Time (h) | 0h | 3h | 6h | 9h | 12h | 15h | 18h | 21h | 24h |
| Temperature (℃) | 21 | 23 | 26 | 21 | 23 | 24 | 25 | 24 | 23 |
| Humidity (%) | 90 | 79 | 66 | 88 | 83 | 76 | 71 | 78 | 80 |
| Dew point (℃) | 19.3 | 19.1 | 19.1 | 18.9 | 19.9 | 19.5 | 19.4 | 19.2 | 19.3 |
Within measuring period, frequency converter work and stand-by time are random, and its inner temperature and humidity is also dynamic change.As time goes on data from table 1 can find out, the dew point of frequency converter inside is in slow increase, and frequency converter operation is after 24 hours, and its inner dewpoint temperature has surpassed environment temperature.From the data of table 2, find out, As time goes on the dewpoint temperature of frequency converter inside is all the time lower than environment temperature and substantially remain unchanged.From the frequency converter humidity conditioner of the known embodiment 1 of above Data Comparison, there is stable dewpoint temperature, avoid the effect of internal condensation.
To sum up, mine-used frequency-converter humidity conditioner of the present utility model, simple in structure, cost is lower, easy to install and use, functional reliability is high, good stability; Its controller Real-time Collection Temperature Humidity Sensor data, by controlling the duty of heating arrangement, guarantee that the dewfall point of frequency converter inner air is all the time lower than environment temperature, thereby can effectively avoid frequency converter internal condensation; When frequency converter is because uncapping or when the drastic change of frequency converter internal-external temperature difference causes frequency converter internal condensation, its controller detects after the block signal of condensation sensor, control frequency converter quits work, and opens heating arrangement simultaneously and accelerates internal moisture evaporation, and send alarm signal; When controller detects frequency converter internal environment and recovers normal, remove alerting signal, control frequency converter and recover normal operation, thereby can effectively protect frequency converter, because dewfall causes, work is undesired even to be damaged.
Above embodiment is the explanation to embodiment of the present utility model; but not to restriction of the present utility model; person skilled in the relevant technique is not in the situation that departing from spirit and scope of the present utility model; can also make various conversion and variation and obtain the corresponding technical scheme being equal to, therefore all technical schemes that are equal to all should be included into scope of patent protection of the present utility model.
Claims (6)
1. a mine-used frequency-converter humidity conditioner, is characterized in that: comprising:
Temperature Humidity Sensor, for gathering the temperature and humidity information in frequency converter;
Condensation sensor, for detection of dewfall whether in frequency converter;
Heating arrangement, dries when the limit value of surpass setting for humidity in frequency converter or dewfall fast;
Controller, for receiving and process the detection signal of Temperature Humidity Sensor and condensation sensor transmission and the duty of heating arrangement being implemented to control;
Described Temperature Humidity Sensor and condensation sensor are all electrically connected to controller signals; Controller is electrically connected to heating arrangement control signal; During use, controller is also electrically connected to the PLC control signal of frequency converter.
2. mine-used frequency-converter humidity conditioner according to claim 1, is characterized in that: described controller comprises:
Single chip processing module, controls for information processing and enforcement;
Temperature-humidity signal acquisition module, for gathering the signal of Temperature Humidity Sensor transmission, and is transferred to single chip processing module by the signal of collection;
Dewfall signal input interface, is electrically connected to the signal of single chip processing module for condensation sensor;
Heating arrangement control module, for accepting the steering order of single chip processing module and then the duty of heating arrangement being implemented to control;
Infrared receiving module and telepilot, for carrying out parameter setting to one-chip computer module;
Display screen, for showing humiture information and the dewfall warning message of single chip processing module transmission;
Guard signal output module, for when the frequency converter internal condensation, output alarm signal is also exported lock-in control signal to the PLC in frequency converter simultaneously;
Power module, for providing the working power of controller.
3. mine-used frequency-converter humidity conditioner according to claim 1, is characterized in that: described Temperature Humidity Sensor is arranged on epicoele place anterior in frequency converter; Condensation sensor is provided with 1 to 3 cover; Condensation sensor is arranged on the inwall near transducer power element place; Heating arrangement comprises the heating wire for heating and prevents overheating protection unit overheated in frequency converter.
4. mine-used frequency-converter humidity conditioner according to claim 2, is characterized in that: the single-chip microcomputer processing unit of described controller comprises microprocessor and accessory circuit thereof; The microprocessor of single-chip microcomputer processing unit is the microprocessor of C8051F410 model.
5. mine-used frequency-converter humidity conditioner according to claim 2, is characterized in that: described power module output+5V power supply and+24V power supply; Described condensation sensor comprises probe R8, hysteresis comparator U2, triode Q1, diode D2, relay switch K1, resistance R 1, resistance R 2, resistance R 5 and resistance R 9; Hysteresis comparator U2 is the comparer of model LM311, and the probe R8 of condensation sensor is the resistance-type condensation sensor of model HDP-07;
One end conllinear of probe one end of R8, the in-phase input end of hysteresis comparator U2 and resistance R 2; One end conllinear of one end of the inverting input of hysteresis comparator U2, resistance R 1 and resistance R 9; The output terminal of hysteresis comparator U2 is electrically connected to the base stage of triode Q1 by resistance R 5; A terminals conllinear of the winding of the positive pole of the collector of triode Q1, diode D2 and relay switch K1; Another terminals that the power supply of the other end of the other end of resistance R 2, resistance R 1, hysteresis comparator U2 is rectified level, the negative pole of diode D2 and the winding of relay switch K1 form a common junction because of conllinear, this common junction connect power module output+5V power supply; Probe the other end of R8, the power end negative pole of the other end of resistance R 9, hysteresis comparator U2, the emitter-base bandgap grading common ground of the earth terminal of hysteresis comparator U2 and triode Q1.
6. mine-used frequency-converter humidity conditioner according to claim 5, is characterized in that: the guard signal output module of described controller comprises Schmidt trigger N1A, optocoupler N2, LED 1, triode Q2, diode Q1 and relay switch K2; The model of Schmidt trigger N1A is 74HC14, and the model of optocoupler N2 is TLP521; Schmidt trigger N1A has No. 1 and No. 2 wiring pins, and optocoupler N2 has wiring pin No. 1 to No. 4;
No. 1 wiring pin of Schmidt trigger N1A is for receiving the signal of single chip processing module output; No. 2 wiring pin conllinear of No. 2 wiring pins of Schmidt trigger N1A, the negative pole of LED 1 and optocoupler N2; The positive pole of LED 1 is electrically connected to one end of resistance R 6; No. 1 wiring pin of optocoupler N2 is electrically connected to one end of resistance R 7; The other end of the other end of resistance R 6 and resistance R 7 forms a common junction because of conllinear, this common junction connect power module output+5V power supply; No. 4 wiring pins of optocoupler N2 are electrically connected to the base stage of triode Q2; No. 3 wiring pins of optocoupler N2 and the collector common ground of triode Q2; A terminals conllinear of the winding of the positive pole of the emitter-base bandgap grading of triode Q2, diode D1 and relay switch K2; Another terminals of the winding of the negative pole of diode D1 and relay switch K2 form a common junction because of conllinear, this common junction connect power module output+24V power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320511498.9U CN203480333U (en) | 2013-08-20 | 2013-08-20 | Mining frequency converter humidity controller |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320511498.9U CN203480333U (en) | 2013-08-20 | 2013-08-20 | Mining frequency converter humidity controller |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104460736A (en) * | 2014-12-30 | 2015-03-25 | 天地（常州）自动化股份有限公司 | Humidity control device in mine explosion-proof equipment |
| CN104503520A (en) * | 2014-12-09 | 2015-04-08 | 国网上海市电力公司 | On-off control circuit for heater in power distribution cabinet |
| CN107283223A (en) * | 2017-08-06 | 2017-10-24 | 银川华信智信息技术有限公司 | Production equipment collecting terminal |
| CN112214057A (en) * | 2020-10-30 | 2021-01-12 | 中山斯瑞德环保科技有限公司 | Temperature and humidity control system and method for frequency converter |
-
2013
- 2013-08-20 CN CN201320511498.9U patent/CN203480333U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104503520A (en) * | 2014-12-09 | 2015-04-08 | 国网上海市电力公司 | On-off control circuit for heater in power distribution cabinet |
| CN104460736A (en) * | 2014-12-30 | 2015-03-25 | 天地（常州）自动化股份有限公司 | Humidity control device in mine explosion-proof equipment |
| CN104460736B (en) * | 2014-12-30 | 2016-08-24 | 天地（常州）自动化股份有限公司 | Mine anti-explosion device interior humidity conditioner |
| CN107283223A (en) * | 2017-08-06 | 2017-10-24 | 银川华信智信息技术有限公司 | Production equipment collecting terminal |
| CN107283223B (en) * | 2017-08-06 | 2024-01-16 | 华新智科技产业发展股份有限公司 | Intelligent acquisition terminal of production equipment |
| CN112214057A (en) * | 2020-10-30 | 2021-01-12 | 中山斯瑞德环保科技有限公司 | Temperature and humidity control system and method for frequency converter |
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