CN110630549A - Control method of double-speed fan heating control device of circulating water cooling tower - Google Patents
Control method of double-speed fan heating control device of circulating water cooling tower Download PDFInfo
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- CN110630549A CN110630549A CN201910836459.8A CN201910836459A CN110630549A CN 110630549 A CN110630549 A CN 110630549A CN 201910836459 A CN201910836459 A CN 201910836459A CN 110630549 A CN110630549 A CN 110630549A
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- temperature
- contactor
- speed
- temperature controller
- circulating water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/008—Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2270/00—Control
- F05D2270/30—Control parameters, e.g. input parameters
- F05D2270/303—Temperature
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
The invention belongs to the technical field of electrical control, and particularly relates to a control method of a double-speed fan heating control device of a circulating water cooling tower. The method does not adopt a frequency converter, and on the basis of the double-speed fan of the circulating water cooling tower, the control loop of the double-speed fan of the cooling tower is modified, temperature controllers are respectively added on auxiliary contacts of a high-speed loop and a low-speed loop, a temperature interval is set, and the fan stops running when the temperature interval is lower than the set temperature interval; in the temperature range, the operation is carried out at low speed; and (4) operating at high speed when the temperature is higher than the temperature range. The invention can stabilize the temperature of the circulating water only by applying the temperature control device, solves the problem that the control of the fan depends on manual control, keeps the temperature of the circulating water stable, realizes safe, stable, long, full and excellent operation of the production device, and achieves the effect of energy saving to a certain extent.
Description
Technical Field
The invention belongs to the technical field of electrical control, and particularly relates to a control method of a double-speed fan heating control device of a circulating water cooling tower.
Background
The circulating water is mainly used for supplying cooling water for each production device, and a compressor, a pump, a water-cooling heat exchanger and the like are used. The circulating water of the production device of the chemical industry enterprise is generally cooled by a water cooling tower fan, most of the fans are double-speed (high-speed and low-speed) control motors, when the circulating water is at normal temperature, the water cooling tower fan only needs to run at low speed, when the circulating water is at high temperature in summer, the water cooling tower fan needs to enter a high-speed state when the temperature of the circulating water is too high, and the cooling effect is achieved. However, the high-speed and low-speed control of the cooling tower fan needs manual control of field operators, and frequent switching control by the field operators is troublesome in the face of temperature differences of four seasons, morning and evening and the like.
Disclosure of Invention
Technical problem to be solved
The invention provides a control method of a double-speed fan heating control device of a circulating water cooling tower, and aims to solve the technical problem of how to realize automatic control of a double-speed fan.
(II) technical scheme
In order to solve the technical problem, the invention provides a control method of a heating control device of a double-speed fan of a circulating water cooling tower, which comprises the following steps: a normally closed contact of a second temperature controller and a normally open contact of the first temperature controller are indirect between the lower end of a start button of the double-speed fan and the upper end of a normally closed contact of a second contactor, a normally closed contact of the first temperature controller and a normally open contact of the second temperature controller are indirect between the lower end of the start button and the upper end of the normally closed contact of the first contactor, temperature sensors of the first temperature controller and the second temperature controller are respectively connected to a water tank of a circulating water cooling tower, a first temperature is set for the first temperature controller, a second temperature is set for the second temperature controller, and the contacts of the first temperature controller and the second temperature controller are controlled to be opened and closed; when the temperature of the temperature sensor is lower than a set first temperature, normally open contacts of the first temperature controller and the second temperature controller are in a disconnected state at the same time, the first contactor coil, the second contactor coil and the third contactor coil are not electrified, and the fan stops running; when the temperature of the temperature sensor is between a set first temperature and a set second temperature, the normally open contact of the first temperature controller is closed, the normally open contact of the first contactor is closed to form self locking, the normally closed contact of the second contactor is closed, the normally closed contact of the third contactor is closed, the coil of the first contactor is electrified, the normally closed contact of the first contactor is disconnected, and the fan runs at a low speed; when the temperature of the temperature sensor is higher than the set second temperature, the normally open contact of the second temperature controller is closed, the normally open contact of the second contactor and the normally open contact of the third contactor are closed to form self locking, the normally closed contact of the first contactor is closed, the coil of the second contactor and the coil of the third contactor are electrified, the normally closed contact of the second contactor and the normally closed contact of the third contactor are disconnected, and the fan runs at a high speed.
Further, the first temperature was 20 ℃ and the second temperature was 30 ℃.
(III) advantageous effects
The invention provides a control method of a double-speed fan heating temperature control device of a circulating water cooling tower, which does not adopt a frequency converter, improves a control loop of the double-speed fan of the cooling tower on the basis of the double-speed fan of the circulating water cooling tower, respectively adds temperature controllers on auxiliary contacts of a high-speed loop and a low-speed loop, sets a temperature interval, and stops the operation of the fan when the temperature interval is lower than the set temperature interval; in the temperature range, the operation is carried out at low speed; and (4) operating at high speed when the temperature is higher than the temperature range. The invention can stabilize the temperature of the circulating water only by applying the temperature control device, solves the problem that the control of the fan depends on manual control, keeps the temperature of the circulating water stable, realizes safe, stable, long, full and excellent operation of the production device, and achieves the effect of energy saving to a certain extent.
Drawings
Fig. 1 is a schematic diagram of a control method of a double-speed fan heating and temperature control device of a circulating water cooling tower according to an embodiment of the invention.
Detailed Description
In order to make the objects, contents and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
The design circuit of the double-speed fan of the existing circulating water cooling tower comprises a three-phase power supply L1, an L2, an L3, a fuse FU1, an FU2, a first contactor KM1, a second contactor KM2, a third contactor KM3, a thermal relay FR, a parking button, a low-speed button and a high-speed button. When the temperature of the water tank of the circulating water cooling tower is higher than 20 ℃ and lower than 30 ℃, a process operator needs to start a low-speed button on site to enable a fan of the circulating water cooling tower to operate at a low speed. When the temperature of the water tank of the circulating water cooling tower is higher than 30 ℃, a process operator needs to start a high-speed button on site to enable a fan of the circulating water cooling tower to operate at a high speed.
On the basis of the double-speed fan of the circulating water cooling tower, the control circuit of the double-speed fan of the cooling tower is improved, and the control method of the heating control device of the double-speed fan of the circulating water cooling tower is provided to realize automatic control of the double-speed fan.
The control method of the embodiment comprises the steps that a temperature control device is added to control the operation of the double-speed fan, and a circuit diagram comprises a three-phase power supply L1, L2 and L3, fuses FU1 and FU2, a first contactor KM1, a second contactor KM2, a third contactor KM3, a thermal relay FR, a stop button SB1, a start button SB2, a first temperature controller 1 and a second temperature controller 2.
The control method of the embodiment specifically comprises the steps of connecting a normally closed contact of a second temperature controller 2 and a normally open contact of a first temperature controller 1 indirectly between the lower end of a vehicle starting button SB2 and the upper end of a normally closed contact of a second contactor KM2, connecting a normally closed contact of the first temperature controller 1 and a normally open contact of the second temperature controller 2 indirectly between the lower end of a vehicle starting button SB2 and the upper end of a normally closed contact of a first contactor KM1, connecting temperature sensors of the first temperature controller 1 and the second temperature controller 2 to a circulating water cooling water tank respectively, setting a first temperature of 20 ℃ for the first temperature controller 1, setting a second temperature of 30 ℃ for the second temperature controller 2, and controlling the contacts of the first temperature controller 1 and the second temperature controller 2 to be opened. When the temperature of the temperature sensor is lower than the set first temperature by 20 ℃, the normally open contacts of the first temperature controller 1 and the second temperature controller 2 are in a disconnected state at the same time, the coil of the first contactor KM1, the coil of the second contactor KM2 and the coil of the third contactor KM3 are not electrified, and the fan stops running; when the temperature of the temperature sensor is between a first set temperature of 20 ℃ and a second set temperature of 30 ℃, the normally open contact of the first temperature controller 1 is closed, the normally open contact of the first contactor KM1 is closed to form self locking, the normally closed contact of the second contactor KM2 is closed, the normally closed contact of the third contactor KM3 is closed, the coil of the first contactor KM1 is electrified, the normally closed contact of the first contactor KM1 is disconnected, and the fan runs at a low speed; when the temperature of the temperature sensor is higher than the set second temperature by 30 ℃, the normally open contact of the second temperature controller 2 is closed, the normally open contacts of the second contactor KM2 and the third contactor KM3 are closed to form self-locking, the normally closed contact of the first contactor KM1 is closed, the coil of the second contactor KM2 and the coil of the third contactor KM3 are electrified, the normally closed contact of the second contactor KM2 and the normally closed contact of the third contactor KM3 are disconnected, and the fan runs at a high speed.
For original design, the problem that fan control relies on artificial control has been solved to the control method of this embodiment, and in the face of difference in temperature such as four seasons, morning and evening, circulating water cooling tower pond temperature also can remain steady, reaches energy-conserving effect to a certain extent economically.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (2)
1. A control method of a double-speed fan heating control device of a circulating water cooling tower is characterized by comprising the following steps: a normally closed contact of a second temperature controller and a normally open contact of the first temperature controller are indirect between the lower end of a start button of the double-speed fan and the upper end of a normally closed contact of a second contactor, a normally closed contact of the first temperature controller and a normally open contact of the second temperature controller are indirect between the lower end of the start button and the upper end of the normally closed contact of the first contactor, temperature sensors of the first temperature controller and the second temperature controller are respectively connected to a water tank of a circulating water cooling tower, a first temperature is set for the first temperature controller, a second temperature is set for the second temperature controller, and the contacts of the first temperature controller and the second temperature controller are controlled to be opened and closed; when the temperature of the temperature sensor is lower than a set first temperature, normally open contacts of the first temperature controller and the second temperature controller are in a disconnected state at the same time, the first contactor coil, the second contactor coil and the third contactor coil are not electrified, and the fan stops running; when the temperature of the temperature sensor is between a set first temperature and a set second temperature, the normally open contact of the first temperature controller is closed, the normally open contact of the first contactor is closed to form self locking, the normally closed contact of the second contactor is closed, the normally closed contact of the third contactor is closed, the coil of the first contactor is electrified, the normally closed contact of the first contactor is disconnected, and the fan runs at a low speed; when the temperature of the temperature sensor is higher than the set second temperature, the normally open contact of the second temperature controller is closed, the normally open contact of the second contactor and the normally open contact of the third contactor are closed to form self locking, the normally closed contact of the first contactor is closed, the coil of the second contactor and the coil of the third contactor are electrified, the normally closed contact of the second contactor and the normally closed contact of the third contactor are disconnected, and the fan runs at a high speed.
2. The control method of claim 1, wherein the first temperature is 20 ℃ and the second temperature is 30 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910836459.8A CN110630549A (en) | 2019-09-05 | 2019-09-05 | Control method of double-speed fan heating control device of circulating water cooling tower |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910836459.8A CN110630549A (en) | 2019-09-05 | 2019-09-05 | Control method of double-speed fan heating control device of circulating water cooling tower |
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| CN110630549A true CN110630549A (en) | 2019-12-31 |
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| CN201910836459.8A Pending CN110630549A (en) | 2019-09-05 | 2019-09-05 | Control method of double-speed fan heating control device of circulating water cooling tower |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202649841U (en) * | 2012-06-05 | 2013-01-02 | 安徽理士电源技术有限公司 | Storage battery oven control circuit |
| CN104454611A (en) * | 2014-12-01 | 2015-03-25 | 南车株洲电力机车有限公司 | Rail transit vehicle, and brake resistor blower control system thereof and method |
| CN206874521U (en) * | 2017-03-24 | 2018-01-12 | 天津欧能电气有限公司 | A kind of Double Speed Fan control system |
| CN208983559U (en) * | 2018-09-05 | 2019-06-14 | 广东美格动力新能源有限公司 | Blower fan control system with intelligent speed-regulating |
-
2019
- 2019-09-05 CN CN201910836459.8A patent/CN110630549A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202649841U (en) * | 2012-06-05 | 2013-01-02 | 安徽理士电源技术有限公司 | Storage battery oven control circuit |
| CN104454611A (en) * | 2014-12-01 | 2015-03-25 | 南车株洲电力机车有限公司 | Rail transit vehicle, and brake resistor blower control system thereof and method |
| CN206874521U (en) * | 2017-03-24 | 2018-01-12 | 天津欧能电气有限公司 | A kind of Double Speed Fan control system |
| CN208983559U (en) * | 2018-09-05 | 2019-06-14 | 广东美格动力新能源有限公司 | Blower fan control system with intelligent speed-regulating |
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Application publication date: 20191231 |
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