CN111271311B - Control device for preventing electric fan from being too cold - Google Patents
Control device for preventing electric fan from being too cold Download PDFInfo
- Publication number
- CN111271311B CN111271311B CN202010105440.9A CN202010105440A CN111271311B CN 111271311 B CN111271311 B CN 111271311B CN 202010105440 A CN202010105440 A CN 202010105440A CN 111271311 B CN111271311 B CN 111271311B
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- CN
- China
- Prior art keywords
- electric fan
- temperature
- relay
- circuit
- metal disc
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
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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
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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)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The invention discloses a control device for preventing an electric fan from being too cold. At present, factors such as the increase of the rotating speed of the electric fan caused by the increase of the voltage of a power grid during the late night valley electricity period are not considered in the temperature control type electric fan. The invention comprises a metal disc which is arranged in the center of a front protective cover of the electric fan and faces to the direction of blades, and a heater and a temperature sensor are arranged in the metal disc. The heater is powered by a constant current source and heats the metal disc. The temperature sensor is connected with a driving circuit through a temperature measuring and comparing circuit, the driving circuit is connected with a relay, and an output contact of the relay is connected in series in a motor loop of the electric fan. The air blown by the electric fan directly blows on the disc in the center of the front mesh enclosure, the temperature of the disc is reduced due to the fact that the room temperature is too low and the voltage of a power grid is too high, and therefore whether the motor of the electric fan is disconnected or not is judged, and people are prevented from catching a cold. The invention has simple structure and strong practicability, and can be widely applied only by connecting the output of the relay of the control device on the motor in series.
Description
Technical Field
The invention belongs to the technical field of automatic control, and particularly relates to a control device for preventing an electric fan from being too cold.
Background
The electric fan has the characteristics of good mobility, high cost performance, power saving and the like, and is widely applied to families and offices. However, when sleeping at night, if the electric fan is blown for a long time, people can catch cold and get sick easily. Therefore, a temperature control type electric fan is proposed, for example, in patent CN201711181556.5, the rotation speed or the on-off state of the electric fan is controlled by measuring the room temperature, so as to prevent the electric fan from running at a high speed to catch a cold at night after the room temperature is reduced. However, the reason why the electric fan is easy to catch cold when being blown for a long time at night is that the rotating speed of the electric fan is not reduced correspondingly after the room temperature is reduced, and the rotating speed of the electric fan is also increased due to the increase of the grid voltage at night. Because the electric load of the power grid is high during the peak power, the voltage of the indoor line of a user is often seriously low when the electric fan starts to be used at night, and the wind speed gear of the electric fan is generally set to be higher. When the electricity is used in the valley at night, the indoor voltage of a user is often higher, so that the rotating speed of the electric fan is increased. Therefore, the reason why the electric fan blows at night to cause the human body to catch a cold is that the temperature of the room at night is lowered, and the factor that the voltage of the power grid is increased during the valley power at night must be considered. However, none of the currently proposed temperature control electric fans consider the factor that the rotation speed of the electric fan is increased due to the increase of the voltage of a power grid during late night valley electricity.
Disclosure of Invention
The invention aims to provide a control device for preventing an electric fan from getting too cold, aiming at the defects of the prior art, and not only can prevent people from getting cold due to the fact that the room temperature is too low at night and the fan speed is not reduced, but also can prevent people from getting cold due to the fact that the fan speed is too high due to too high power grid voltage at night.
The invention comprises a metal disc which is arranged in the center of a front protective cover of an electric fan and faces to the direction of blades, wherein a mounting hole is formed in the metal disc, and a heater and a temperature sensor are arranged in the mounting hole.
The heater is powered by a constant current source and heats the metal disc.
The signal output end of the temperature sensor is connected with the signal input end of the temperature measuring and comparing circuit, the signal output end of the temperature measuring and comparing circuit is connected with the signal input end of the driving circuit, the signal output end of the driving circuit is connected with the input end of the relay, and the output contact of the relay is connected in series in the motor loop of the electric fan.
One end of the direct current power supply circuit is an electric connection end, and the other end of the direct current power supply circuit is respectively connected with the constant current source, the temperature measurement and comparison circuit and the driving circuit to supply power for the constant current source, the temperature measurement and comparison circuit and the driving circuit.
Further, the relay is a normally closed contact type relay.
The beneficial effects of the invention include:
1. the invention does not simply measure the room temperature to control the electric fan, but indirectly controls the temperature change of the metal disc blown by the wind blown by the electric fan. Because the temperature of the metal disc is measured under the action of the wind flow of the blades of the electric fan, the temperature can reflect the actual temperature sensed by a human body better than the temperature measured at other positions.
2. The invention not only measures the change of the room temperature, but also considers the fan speed change caused by the voltage change of the power grid, thereby avoiding the problem that the room temperature is not changed greatly, but the personnel catch a cold due to overhigh rotating speed caused by overhigh voltage of the power grid.
3. The temperature sensor is arranged in the metal disc, and the characteristic of large heat capacity of metal is utilized to prevent the control circuit from being falsely triggered to work due to transient room temperature change or transient grid voltage change, avoid the frequent connection or disconnection of the current of the motor of the electric fan and improve the comfort level of human bodies.
4. The invention does not change the original control circuit of the fan, only needs to connect the output of the relay of the control device on the motor in series, and has wide applicability.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a circuit diagram of the present invention.
Detailed Description
As shown in figure 1, the control device for preventing the electric fan from being too cold comprises a metal disc 1 which is arranged at the center of a front protective cover of the electric fan and faces to the direction of a blade, wherein a mounting hole is formed in the metal disc 1, and a heater 2 and a temperature sensor 3 are arranged in the mounting hole.
As shown in fig. 2, the heater 2 is supplied with power from the constant current source 4 to heat the metal disk 1.
The signal output end of the temperature sensor 3 is connected with the signal input end of the temperature measuring and comparing circuit 5, the signal output end of the temperature measuring and comparing circuit 5 is connected with the signal input end of the driving circuit 6, the signal output end of the driving circuit 6 is connected with the input end of the relay 7, and the output contact of the relay 7 is connected in series in the loop of the electric fan motor. One end of the direct current power supply circuit 8 is a power connection end which is connected with commercial power in use, and the other end is respectively connected with the constant current source 4, the temperature measurement and comparison circuit 5 and the drive circuit 6 to supply power for the constant current source 4, the temperature measurement and comparison circuit 5 and the drive circuit 6.
The temperature sensor 3 measures the temperature of the metal disc, the temperature measuring and comparing circuit 5 compares the measured temperature with the preset temperature, and controls the driving circuit 6 to output the relay driving current according to the comparison result, and controls the relay 7 to be opened and closed. The output of the relay 7 is connected in series in the motor loop of the electric fan to control the on-off of the motor current, thereby controlling the on-off of the electric fan.
The electric fan motor loop mainly comprises a motor control circuit 9 and an electric fan motor 10 (the inner part of a dotted line frame in the figure), and is unchanged by using the prior electric fan technology.
The relay 7 adopts a normally closed contact type relay, the temperature measuring and comparing circuit 5, the driving circuit 6 and the direct current power supply circuit 8 are mature prior art, and the invention point of the control device lies in that the existing circuits are utilized to adjust the switching mode of the electric fan according to the temperature change. The specific working mode is as follows:
when the motor of the electric fan works, if the measured temperature is higher than the set temperature, the temperature comparison circuit does not output signals, the driving circuit does not output driving current, no current flows through a coil of the normally closed contact type relay, the contacts are closed, and the electric fan works under the original control circuit. On the contrary, if the measured temperature is lower than the set temperature, the temperature comparison circuit outputs driving current, the contact of the normally closed contact type relay is disconnected, the motor of the electric fan is disconnected, the electric fan stops rotating, and the people to be blown are prevented from catching a cold.
The specific working principle is as follows: when the electric fan works, the heater heats the metal disc under a set current, and the heating current is set to enable the temperature of the metal disc to be 5-10 ℃ higher than the room temperature at that time (set according to requirements). When the room temperature and the rotating speed of the electric fan are not changed, the temperature of the metal disc is not changed, the controller does not work, the output relay contact is normally closed, and the electric fan operates in a conventional mode.
And 1, when the room temperature is reduced, because the current passing through the heater is supplied by the constant current source without change, the temperature of the metal disc is reduced due to the reduction of the room temperature, the driving circuit outputs driving current after the judgment of the temperature measuring and comparing circuit to control the contact of the relay to be disconnected, the current of the fan motor is cut off, and the fan blade stops rotating. After the fan was stopped, the temperature of the metal disc slowly rose back as room temperature rose. When the temperature of the metal disc rises above the set value, the drive circuit does not output drive current any more, the control relay contact is closed, the current of the fan motor is switched on, and the fan blades rotate again. The adjustment process is continuously carried out, and the condition that the blown person is cooled when the room temperature is too low is avoided.
And 2, when the power grid voltage rises during late night valley electricity, the current passing through the heater is constant, so that the heating power is not changed, but the rotating speed of the blades of the electric fan is increased, so that the temperature of the metal disc is reduced due to the rise of the power grid voltage, the temperature measurement and comparison circuit controls the driving circuit to output the driving current to control the relay contact to be disconnected, the current of the fan motor is cut off, the fan blades stop rotating, and the temperature of the metal disc slowly rises. When the temperature of the metal disc rises above a set value, the temperature comparison circuit stops outputting current, the control relay contact is closed, the current of the fan motor is switched on, and the fan blades rotate again. The adjustment process is continuously carried out, and the condition that the blown person is cooled when the voltage of the power grid is too high is avoided.
Claims (2)
1. The utility model provides an electric fan prevents cold controlling means which characterized in that:
the electric fan comprises a metal disc (1) which is arranged in the center of a front protective cover of the electric fan and faces to the direction of a blade, wherein a mounting hole is formed in the metal disc (1), and a heater (2) and a temperature sensor (3) are arranged in the mounting hole;
the heater (2) is powered by a constant current source (4) and heats the metal disc (1);
the signal output end of the temperature sensor (3) is connected with the signal input end of the temperature measuring and comparing circuit (5), the signal output end of the temperature measuring and comparing circuit (5) is connected with the signal input end of the driving circuit (6), the signal output end of the driving circuit (6) is connected with the input end of the relay (7), and the output contact of the relay (7) is connected in series in the motor loop of the electric fan;
one end of the direct current power supply circuit (8) is a power connection end, and the other end of the direct current power supply circuit is respectively connected with the constant current source (4), the temperature measurement and comparison circuit (5) and the driving circuit (6) to supply power for the constant current source (4), the temperature measurement and comparison circuit (5) and the driving circuit (6).
2. The control device for preventing the electric fan from being too cold as claimed in claim 1, wherein: the relay (7) is a normally closed contact type relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010105440.9A CN111271311B (en) | 2020-02-20 | 2020-02-20 | Control device for preventing electric fan from being too cold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010105440.9A CN111271311B (en) | 2020-02-20 | 2020-02-20 | Control device for preventing electric fan from being too cold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111271311A CN111271311A (en) | 2020-06-12 |
| CN111271311B true CN111271311B (en) | 2020-10-30 |
Family
ID=70995365
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010105440.9A Expired - Fee Related CN111271311B (en) | 2020-02-20 | 2020-02-20 | Control device for preventing electric fan from being too cold |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111271311B (en) |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2111394U (en) * | 1991-12-31 | 1992-07-29 | 苏长发 | Automatic retarding fan |
| JPH1122692A (en) * | 1997-06-30 | 1999-01-26 | Asahi Corp:Kk | Electric fan |
| KR20090069420A (en) * | 2007-12-26 | 2009-07-01 | 홍권수 | Warmofpropela |
| CN202251012U (en) * | 2011-10-13 | 2012-05-30 | 袁东成 | Fan capable of regulating speed automatically |
| CN202768449U (en) * | 2012-09-24 | 2013-03-06 | 王淑萍 | Novel automatic temperature controlling fan |
| CN203867934U (en) * | 2014-05-20 | 2014-10-08 | 浙江省松阳县职业中等专业学校 | Temperature-controlled heating moisturizing electric fan |
| CN203809330U (en) * | 2014-05-21 | 2014-09-03 | 金陵科技学院 | Automatic tracking smart fan |
| CN204663920U (en) * | 2014-12-31 | 2015-09-23 | 安徽师范大学 | Electric fan |
| CN206530511U (en) * | 2017-01-25 | 2017-09-29 | 中山市双冠电器制品有限公司 | A kind of fan |
| CN207715409U (en) * | 2017-12-08 | 2018-08-10 | 倪隆彦 | A kind of multi-functional intelligence control fan |
-
2020
- 2020-02-20 CN CN202010105440.9A patent/CN111271311B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN111271311A (en) | 2020-06-12 |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201030 |