CN110685946A - Fan safety protection device and method - Google Patents
Fan safety protection device and method Download PDFInfo
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- CN110685946A CN110685946A CN201910879365.9A CN201910879365A CN110685946A CN 110685946 A CN110685946 A CN 110685946A CN 201910879365 A CN201910879365 A CN 201910879365A CN 110685946 A CN110685946 A CN 110685946A
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- touch
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- copper sheet
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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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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The invention discloses a fan safety protection device and method. Wherein, safety device includes: the touch signal processing circuit comprises a touch signal processing circuit, a sensing box, a first touch sensing copper sheet, a second touch sensing copper sheet and a fan mesh enclosure; the touch signal processing circuit is arranged in the induction box; the first touch sensing copper sheet and the second touch sensing copper sheet are oppositely arranged to form a sensing capacitor, and the first touch sensing copper sheet is connected with the fan mesh enclosure; the potential safety hazard in the use of the existing fan is solved, the device is safe, simple and reliable, and the induction box shell is used for electrical isolation and insulation, so that the fan has the beneficial effect of improving the use safety of the fan.
Description
Technical Field
The invention relates to the technical field of household appliance control, in particular to a fan safety protection device.
Background
Along with the development of the household appliance industry, the requirement on safety is more and more strict, in the prior art, although the fan is provided with the protective net cover when in operation so as to prevent the rotating fan blades from hurting people, fingers of children are thin, and the fingers can still extend into the net cover carelessly to cause accidental injury, so that a fan safety protection device is needed, the fan automatically stops working and returns to a standby state as soon as the hands touch the net cover, and the safe use is ensured, and the accidental injury is prevented.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, an object of the present invention is to provide a fan safety protection device, which can effectively improve the safety of the fan.
Therefore, the second purpose of the invention is to provide a fan safety protection method.
The technical scheme adopted by the invention is as follows:
in a first aspect, the present invention provides a fan safety protection device, including: the touch signal processing circuit comprises a touch signal processing circuit, a sensing box, a first touch sensing copper sheet, a second touch sensing copper sheet, a first connecting wire, a second connecting wire, a fan motor cover and a fan mesh enclosure; the induction box is a plastic shell and is fixedly arranged above the fan motor cover; the touch signal processing circuit is arranged in the induction box; the inner layer and the outer layer of the induction box are respectively provided with the first touch induction copper sheet and the second touch induction copper sheet; one end of the first connecting wire is connected with the first touch sensing copper sheet, and the other end of the first connecting wire is connected with the metal buckle on the fan mesh enclosure; one end of the second lead is connected with the second touch sensing copper sheet, and the other end of the second lead is connected with the touch signal processing circuit.
Further, touch circuits are distributed on the touch signal processing circuit, and the touch circuits comprise: the touch control device comprises a current-limiting resistor, a touch chip, a sensitivity adjusting resistor or capacitor and a socket, wherein one end of the current-limiting resistor is connected with a second touch sensing copper sheet, the other end of the current-limiting resistor is connected with the touch chip, the touch chip is electrically connected with one end of the sensitivity adjusting resistor or capacitor, the other end of the sensitivity adjusting resistor or capacitor is grounded, and the output end of the touch chip, a power line and a ground wire are respectively connected with corresponding ports of the socket.
Further, the fan safety protection device further comprises a fan switch control circuit, the output end of the main control unit is connected with a resistor, the output end of the resistor is connected with the base electrode of the triode, the collector electrode of the triode is divided into two paths which are respectively connected with the relay and the freewheeling diode, the output nodes of the two paths are connected with the power supply, and the relay controls the fan to stop rotating and normally operate through the switch disconnection or the switch closure.
The first touch sensing copper sheet and the second touch sensing copper sheet are separated by a plastic shell.
In a second aspect, the present invention provides a fan safety protection method, including:
when a human body touches the fan mesh enclosure, a human body sensing signal is transmitted to a first touch sensing copper sheet on the outer layer of the plastic shell of the sensing box through the fan mesh enclosure and the first connecting wire respectively, wherein the first touch sensing copper sheet and a second touch sensing copper sheet on the inner layer of the plastic shell of the sensing box are oppositely arranged to form a space sensing capacitor, and the touch signal is coupled to the second touch sensing copper sheet on the inner layer of the shell through the first touch sensing copper sheet and the plastic shell of the sensing box.
Furthermore, the touch signal is transmitted to the touch signal processing circuit through the second connecting wire, the touch signal processing circuit is transmitted to the touch chip through the current limiting resistor for detection, and when the touch chip detects that a human body touches the signal, a changed level signal is output through the socket.
Furthermore, a variable level signal output by the socket is transmitted to a main control unit of the fan switch control circuit, the main control unit judges that the received signal is a touch signal by detecting the variable level signal, the variable level signal is a level signal changed from a high level to a low level, here, the variable level can be changed from the low level to the high level, and the type of the variable level is different according to the type of the selected touch chip; then the main control unit outputs low level to drive the triode to be cut off through the resistor, at the moment, the relay is in a disconnected state, so that the motor is controlled to stop rotating, meanwhile, the main control unit automatically returns to a standby mode, and the fan can work again only by pressing a key again.
The invention has the beneficial effects that:
according to the invention, by adopting the means that the touch sensing copper sheets are arranged on the inner side and the outer side of the shell of the sensing box above the motor cover and the touch chip is arranged on the touch signal processing circuit in the sensing box, the touch signal on the fan cover is isolated by the plastic shell of the sensing box and then coupled to the touch chip in the sensing box for detection, the touch signal is not in direct contact with the touch chip, the high-voltage static electricity or external voltage on a human body is prevented from being directly transmitted to the touch chip to cause breakdown damage, and meanwhile, the sealed sensing box also has the effects of electrical insulation, water prevention and dust prevention, so that the possibility of electric shock caused by the direct contact of the human body and. The fan guard device detects whether a person touches the fan guard and controls the fan to stop working in time by using a capacitance change principle generated by human touch, thereby playing a safety protection role, solving the potential safety hazard of the existing fan in use, being safe, simple and reliable, and improving the safety of the fan in use.
Drawings
Fig. 1 is a side view of a mounting structure of a fan safety guard according to an embodiment of the present invention.
Fig. 2 is a touch sensing circuit diagram of a fan safety protection device according to an embodiment of the invention.
Fig. 3 is a circuit diagram of a fan switch control circuit of a fan safety protection device according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a fan safety protection method according to an embodiment of the invention.
Description of reference numerals:
1: a touch signal processing circuit; 2: an induction box; 3: a first touch sensitive copper sheet; 4: a second touch sensitive copper sheet; 5: a first connecting wire; 7: a fan motor cover; 8: a fan guard; 9: a metal buckle; 10: a current limiting resistor; 11: a sensitivity adjusting resistor or capacitor; 12 touch chip U1; 13: a capacitor; 14: a socket; 15: a relay; 16: a freewheeling diode; 17: a triode; 18: a resistance; 19: a main control unit;
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
Embodiment 1, as shown in fig. 1 and 2, a touch signal processing circuit 1, a sensing box 2, a first touch sensing copper sheet 3, a second touch sensing copper sheet 4, a first connecting wire 5, a second connecting wire, a fan motor cover 7, and a fan mesh cover 8; the induction box 2 is a plastic shell and is arranged above the fan motor cover 7; the touch signal processing circuit 1 is arranged in the induction box 2; the inner layer and the outer layer of the plastic shell of the induction box 2 are respectively provided with the second touch induction copper sheet 4 and the first induction touch copper sheet 3; one end of the first connecting wire 5 is connected with the first touch sensing copper sheet 3, and the other end of the first connecting wire is connected with the metal buckle 9 on the fan mesh enclosure 8; one end of the second lead is connected with the second touch sensing copper sheet 4, and the other end of the second lead is connected with the touch signal processing circuit 1.
Wherein, 2 plastic shells of response box can adopt electrostatic insulation's such as ABS, PP (polypropylene) plastic material, and the wall thickness is about 2 ~ 3mm, and the detection effect that the human response is then influenced to the excessive thickness, and response box 2 is fixed in order to link into an organic whole with fan motor cover 7 structurally accessible screw or buckle.
The first connecting wire 5 and the second connecting wire can adopt AWG24 or AWG26 flexible wires with the color similar to that of the fan body, one end of the first connecting wire 5 is provided with a circular flat gasket with an inner hole for screws and nuts to be locked on the metal buckle 9 of the fan mesh enclosure 8, the other end of the first connecting wire is stripped by 3mm for being connected with the first touch sensing copper sheet 3, and the length of the wires can be on the premise of not interfering with the left and right swinging heads of the fan.
On the other hand, as shown in fig. 2, the touch signal processing circuit includes: the touch screen comprises a current limiting resistor 10, a touch chip 12, a sensitivity adjusting resistor or capacitor 11 and a socket 14, wherein the touch chip 12 is a special touch chip of a single touch channel, and can select models of TS01, SC01 and the like, and the touch sensitivity of the touch chip cannot be too high or too low, so that the reliable touch output level change can occur when the touch screen 8 is adjusted to be touched by a hand after installation. Otherwise the following two situations occur:
(1) if the touch sensitivity is adjusted to be too high, the high-low level output signal change of the touch chip can automatically occur when a hand does not touch the fan guard;
(2) if the touch sensitivity is adjusted too low, the output change of the touch level can occur when a hand touches the fan guard;
the two conditions can cause the human touch detection failure of the fan guard.
As shown in fig. 3, the resistor 18 may be 1K to prevent the pins of the touch chip from being damaged by electrostatic breakdown; the first touch sensing copper sheet 3 and the second touch sensing copper sheet 4 can adopt thin copper sheets with the length of 2cm, the width of 2cm and the thickness of 0.1mm, and if the areas are too small, the condition of touch failure of the fan mesh enclosure caused by poor sensing effect can occur; the second touch sensing copper sheet 4 and the first touch sensing copper sheet 3 are respectively adhered to the inner side wall and the outer side wall of the plastic shell of the sensing box 2 in a mode of double faced adhesive tape or other strong adhesives, the two copper sheets need to be aligned face to face during installation, a positioning groove with the depth of 0.1mm can be designed on the inner layer and the outer layer of the shell of the sensing box, the sensing copper sheets are aligned and adhered and fixed, the purpose is to ensure that touch signals can be transmitted and coupled to the maximum degree, and the influence of the installation of the sensing copper sheets on the touch sensitivity is reduced to the minimum degree.
The touch signal processing circuit 1 further comprises a PCB, the PCB can be made of CEM-1 or FR-4 plates with the thickness of 1.0mm or 1.2mm, the size of the PCB depends on the number of peripheral devices of a corresponding circuit of the touch chip, the touch signal processing circuit 1 is connected with a main control board on a fan base through sockets 14 and 3PIN connecting flat cables VDD, GND and OUT, and the sockets can be made of XH-3AW or PH-3AW and the like.
On the other hand, as shown in fig. 3, the fan safety protection device further comprises a fan switch control circuit, wherein the fan switch control circuit comprises a main control 19, a resistor 18, a triode 17, a freewheeling diode 16 and a relay 15; the relay 15 is a normally open relay, the normally open relay is a single-pole switch relay, and when the master control 19 detects that a touch signal exists, a low level is output and is cut off by the triode 17 driven by the resistor 18, so that the switch of the relay 15 is in a disconnected state, and the motor is controlled to stop rotating. Otherwise, the output high level drives the triode 17 to be conducted through the resistor 18, so that the switch of the relay 15 is closed, and the fan motor operates normally. The relay 15 switch controls the stop rotation and normal operation of the fan by opening or closing.
The main control unit 19 on the main control board is a single chip microcomputer, the resistor 18 is 2.2K-4.7K, the triode 17 can be an NPN triode such as 8050 and 9014, the freewheeling diode 16 can be 1N4148 and 1N4007, and the relay 15 is determined according to the maximum starting current of the fan motor, for example, if the fan motor does not exceed 50W, the normally-open relay of the AC250V and 5A specifications can be selected.
Wherein, 2 plastic shells of response box can adopt electrostatic insulation's such as ABS, PP (polypropylene) plastic material, and the wall thickness is about 2 ~ 3mm, and too thick then can influence the detection effect of human response, and response box 2 and fan motor cover 7 structurally accessible screw or buckle installation link into an organic whole.
The first connecting wire 5 and the second connecting wire can adopt AWG24 or AWG26 flexible wires with the color similar to that of the fan body, one end of the first connecting wire 5 is provided with a round flat gasket with an inner hole, a screw and a nut are locked on the metal buckle 9 of the fan mesh enclosure 8, the other end of the first connecting wire is stripped by 3mm, the first connecting wire is connected with the first touch sensing copper sheet 3 in a soldering mode, and the length of the wires can be on the premise that the left swing head and the right swing head of the fan are not hindered.
As shown in fig. 3, the fan safety protection device further comprises a fan switch control circuit, wherein the fan switch control circuit comprises a main control 19, a resistor 18, a triode 17, a freewheeling diode 16 and a relay 15; the relay 15 is a normally open relay, the normally open relay is a single-pole switch relay, and when the master control 19 detects that a touch signal exists, a low level is output and drives the triode 17 to be cut off through the resistor 18, so that the switch of the relay 15 is in a disconnected state, and the motor is controlled to stop rotating. Otherwise, the output high level drives the triode 17 to be conducted through the resistor 18, so that the switch of the relay 15 is closed, and the fan motor operates normally. The relay 15 switch controls the stop rotation and normal operation of the fan by opening or closing.
s1, power supply circuit: the power supply circuit supplies power to the whole system circuit;
s2, touch sensing device and isolation plastic: when a human body touches the fan mesh enclosure 8, a human body sensing signal is transmitted to a first touch sensing copper sheet 3 on the outer layer of the plastic shell of the sensing box 2 through the fan mesh enclosure 8 and the first connecting wire 5 respectively, wherein the first touch sensing copper sheet 3 and a second touch sensing copper sheet 4 on the inner layer of the plastic shell of the sensing box are oppositely arranged to form a space sensing capacitor, and the touch signal is coupled to the second touch sensing copper sheet 4 on the inner layer of the shell through the first touch sensing copper sheet 3 and the plastic shell of the sensing box 2;
s3, the touch detection circuit detects: the touch signal generated in step S2 is transmitted to the touch signal processing circuit 1 through the second connecting wire, and is transmitted to the touch chip 12 through the current limiting resistor 10 on the touch signal processing circuit 1 for detection, when the touch chip 12 detects a human touch signal, a level signal with a change is output through the socket 14, the type of the level signal change depends on the selected touch chip, and in the existing touch chip detection, there are two types of level signal changes:
case 1, level signal changes from high level to low level;
case 2: the level signal changes from low level to high level;
s4, the main control unit: the level-changing signal transmitted in step S3 is transmitted to the main control unit of the fan switch control circuit, and the main control unit determines that the received signal is a touch signal by detecting the level-changing signal;
s5, the fan switch control circuit: the low level signal drives the triode 17 through the resistor 18, and the relay is a normally open relay, so the relay is in a disconnected state when the triode 17 is conducted, the motor is controlled to stop rotating, meanwhile, the main control unit automatically returns to a standby mode, and the fan can work again only by pressing a key again, so that the safety is ensured, and accidental injuries are prevented; in addition, when a user cleans the fan, the user can automatically stop the fan and return to the standby mode by touching the fan guard 8, so that the use is more intelligent and convenient.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A fan safety guard, comprising:
the touch signal processing circuit comprises a touch signal processing circuit, a sensing box, a first touch sensing copper sheet, a second touch sensing copper sheet and a fan mesh enclosure; the touch signal processing circuit is arranged in the induction box; the first touch sensing copper sheet and the second touch sensing copper sheet are oppositely arranged face to face across a plastic shell to form a sensing capacitor, and the first touch sensing copper sheet is connected with the fan mesh enclosure.
2. A fan safety guard according to claim 1, wherein the touch signal processing circuit comprises: the touch control device comprises a current-limiting resistor, a touch sensing chip, a sensitivity adjusting resistor or capacitor and a socket, wherein one end of the current-limiting resistor is connected with a second touch sensing copper sheet, the other end of the current-limiting resistor is connected with the touch chip, the touch chip is connected with one end of the sensitivity adjusting resistor or capacitor, the other end of the sensitivity adjusting resistor or capacitor is grounded, and the touch chip, a power line and a ground line are respectively connected with corresponding ports of the socket.
3. The fan safety protection device according to claim 1 or 2, further comprising a fan switch control circuit, wherein the fan switch control circuit comprises a main control unit, a resistor, a triode, a freewheeling diode and a relay; the output end of the main control unit is connected with a resistor, the output end of the resistor is connected with the base electrode of the triode, the collector electrode of the triode is divided into two paths to be respectively connected with a relay and a freewheeling diode, the output nodes of the two paths are connected with a power supply, and the relay controls the fan to stop rotating and normally operate by switching off or switching on the switch.
4. The fan safety guard of claim 1, wherein the first touch sensitive copper sheet and the second touch sensitive copper sheet are separated by a plastic housing.
5. A method of protection comprising a fan safety guard according to claim 1 or claim 2, comprising:
when a human body touches the fan mesh enclosure, a human body sensing signal is transmitted to a first touch sensing copper sheet on the outer layer of the plastic shell of the sensing box through the fan mesh enclosure, wherein the first touch sensing copper sheet and a second touch sensing copper sheet on the inner layer of the plastic shell of the sensing box are oppositely arranged to form a space sensing capacitor, and the touch signal is coupled to the second touch sensing copper sheet on the inner layer of the shell through the first touch sensing copper sheet and the plastic shell of the sensing box.
6. The method as claimed in claim 5, further comprising:
the touch signal is transmitted to the touch signal processing circuit, the touch signal is transmitted to the touch chip for detection through the current limiting resistor, and when the touch chip detects that a human body touches the signal, a changed level signal is output through the socket.
7. The method as claimed in claim 6, further comprising:
the variable level signal transmitted by the socket is transmitted to a main control unit of the fan switch control circuit, the main control unit judges that the received signal is a touch signal by detecting the variable level signal, then the main control unit outputs a low level to drive the triode to be cut off by the resistor, and the relay is in a disconnected state at the moment, so that the motor is controlled to stop rotating, and meanwhile, the main control unit automatically returns to a standby mode, and the fan can work again only by pressing a key again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910879365.9A CN110685946A (en) | 2019-09-18 | 2019-09-18 | Fan safety protection device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910879365.9A CN110685946A (en) | 2019-09-18 | 2019-09-18 | Fan safety protection device and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110685946A true CN110685946A (en) | 2020-01-14 |
Family
ID=69109665
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910879365.9A Pending CN110685946A (en) | 2019-09-18 | 2019-09-18 | Fan safety protection device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110685946A (en) |
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2019
- 2019-09-18 CN CN201910879365.9A patent/CN110685946A/en active Pending
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