US3826180A - Ventilation fan system with smoke detector speed control - Google Patents

Ventilation fan system with smoke detector speed control Download PDF

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Publication number
US3826180A
US3826180A US00341781A US34178173A US3826180A US 3826180 A US3826180 A US 3826180A US 00341781 A US00341781 A US 00341781A US 34178173 A US34178173 A US 34178173A US 3826180 A US3826180 A US 3826180A
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switch
circuit
adjusting
sensitivity
smoke
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US00341781A
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English (en)
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T Hayashi
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Individual
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Individual
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Priority claimed from JP7617872A external-priority patent/JPS5119693B2/ja
Priority claimed from JP47076181A external-priority patent/JPS509094B2/ja
Priority claimed from JP7617972A external-priority patent/JPS4933458A/ja
Priority claimed from JP7618072A external-priority patent/JPS4933490A/ja
Priority claimed from JP7791272A external-priority patent/JPS509096B2/ja
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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
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C2/00—Fire prevention or containment
    • A62C2/06—Physical fire-barriers
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C2/00—Fire prevention or containment
    • A62C2/06—Physical fire-barriers
    • A62C2/24—Operating or controlling mechanisms
    • A62C2/246—Operating or controlling mechanisms having non-mechanical actuators
    • A62C2/247—Operating or controlling mechanisms having non-mechanical actuators electric

Definitions

  • This invention relates to a ventilator wherein an electronic circuit is actuated when at detecting element detects the existence of any smoke or gas while a fan is in a manually selected slow rotating node of operation or in a stand-by halting position, and then the fan is automatically put into full rotation in order to expel smoke or such gas as carbon monoxide, and also for a specified period after completion of this expelling operation the fan is kept rotating during the above operation through the function of a delay-off circuit, with a shutter of a ventilating window being kept open by means of a switch network.
  • This invention concerns a field of automatic ventilator commonly used in households or the like, but which is particular in that when smoke or gas from cooking, etc. is filling a kitchen, etc. or when unusual smoke or carbon monoxide, etc. is emerging due to a fire, while the fan is in low rotation or even idle, an electronic circuit is actuated by a detecting element and automatically activates the ventilating fan.
  • the object of this invention is to actuate an electronic circuit of a ventilator whenever smoke or gas appears while a ventilating fan is operating at low speed or inoperative of a detecting element which is sensitive to smoke or gas, which circuit switches the fan into high speed operation.
  • smoke is defined to mean smoke or gas.
  • the apparatus of this invention is provided with a switch designed for manually selecting three kinds of circuit connections, that is, for manually selected high speed operation, for manually selected low speed operation and for automatic control.
  • the detecting element detects smoke, no matter which connection of said switch was selected, the electronic circuit actuates an electromagnetic relay switch and automatically shifts the operation from manual control into automatic control and to high speed rotation.
  • the shift back from high speed operation into low speed turning off the apparatus of this invention is achieved by short-circuiting a speed control coil.
  • a speed control coil For this purpose, an electromagnetic relay switch which closes a normal-open contact is provided, together with a ventilating fan motor having a main coil connected in parallel with a branch which connects an auxiliary coil, a resistor and the speed control coil in series.
  • said speed control coil is short-circuited by means of said manual operation switch, electromagnetic relay switch and another switch.
  • the apparatus of this invention is provided with a switch which maintains manual-open condition of a ventilator shutter while the fan shifts from manually started low speed operation into an automatic operation as a result of smoke detection. Accordingly, the wasteful opening and closing 'of the shutter which are usual in the prior art devices when shifting from the manually started operation into automatic operation can be avoided.
  • the electronic circuit to be actuated by the detecting element in the apparatus of this invention has a sensitivity adjusting circuit and a delay-off circuit part, as well as an electromagnetic relay switch which disconnects the delay-off circuit when adjusting sensitivity for operating the ventilating fan in accordance with due density of smoke. Accordingly, by watching a sensitivity adjusting lamp controlled by the electromagnetic relay switch, the sensitivity can be adjusted.
  • the electronic circuit to be actuated by the detecting element is provided with the sensitivity adjusting circuit and the delay-off circuit part, and it is further provided with a switch for disconnecting the delay-off circuit while adjusting sensitivity in order to drive the ventilator in accordance with the density of smoke. Hence, such adjustment can be made by watching the movement of the ventilator.
  • said electronic circuit to be actuated by a signal from the detecting element is provided with the adjusting circuit for adjusting the sensitivity of the system and the delay-off circuit for operating the ventilating fan for a specified period after expulsion of smoke.
  • the adjusting circuit for adjusting the sensitivity of the system and the delay-off circuit for operating the ventilating fan for a specified period after expulsion of smoke.
  • Said sensitivity adjusting circuit of the electronic circuit to be actuated by the detecting element is provided with a semi-fixed resistor for compensating the threshold sensitivity, another semi-fixed resistor for presetting the position of an adjusting knob inbetween and a variable resistor for determining the operating sensitivity of the electronic-circuit.
  • a due sensitivity can be set in an inbetween position.
  • the apparatus of this invention is provided with a manual switch operated for instance, by a pull string and having separate contacts for high speed, low speed and automatic operations, an electromagnetic relay switch capable of activating the ventilator in response to detected smoke with the detecting element at any of said contact, an automatic lamp which lights while the pull string switch is connected with the automatic contact, a manual lamp which lights while connected with high speed or low speed contact, and a circuit which lights either one of the manual and automatic lamps while the other one is cut off due to voltage division between the power source and the pull string switch.
  • a manual switch operated for instance, by a pull string and having separate contacts for high speed, low speed and automatic operations
  • an electromagnetic relay switch capable of activating the ventilator in response to detected smoke with the detecting element at any of said contact
  • an automatic lamp which lights while the pull string switch is connected with the automatic contact
  • a manual lamp which lights while connected with high speed or low speed contact
  • a circuit which lights either one of the manual and automatic lamps while the other one is cut off due to voltage division between the power source and the pull
  • the apparatus of this invention is provided with the adjusting circuit including the detecting element, an amplifying circuit for amplifying signals of said adjusting circuit, and the delay-off circuit part for operating the ventilator after said amplifying circuit is disconnected, wherein said adjusting circuit and amplifying circuit part are combined, said amplifying circuit and delay-off circuit are combined via the electromagnetic relay switch, and said delay-off circuit and an output circuit part are connected via the electromagnetic relay switch. Therefore the ventilator of the output circuit is activated whenever the detecting element detects smoke.
  • FIG. 1 is a front view of a ventilator of an example of this invention
  • FIG. 2 is a diagram of an electronic circuit of said ventilating fan
  • FIG. 3 is a diagram of an electronic circuit of a ventilator of another example.
  • FIG. 4 is a characteristic diagram of a detecting element.
  • numeral 1 indicates a ventilator frame
  • numeral 1 indicates a shutter which has a known constitution and is driven by an electromagnet.
  • Numeral 2 indicates a fan to be driven by a motor 12
  • numeral 3 a pull string for manual switching between automatic and manual operations
  • numerals 4 and 5 automatic and manua indication lamps respectively
  • numeral 6 indicates an inlet for smoke or gas (hereinafter referred to only as smoke") accumulating below a front frame 7 of the ventilator frame 1
  • numeral 8 an adjusting knob for regulating the sensitivity of the detection against the density of accumulating smoke to automatically change over to high speed operation
  • numeral 9 a sensitivityadjusting neon lamp for guiding the position of the adjusting knob 8 in regulating the sensitivity.
  • a series resistor 91 is connected in series to the neon lamp 9.
  • the adjusting knob 8 is turned clockwise first from an L side (position of the lowest potential) to an H side (position of the highest potential) to find the position where the sensitivity-adjusting lamp 9 goes off and thefan 2 starts rotating. By reversing the knob 8 from this position in the direction of the L side, a point is found where the sensitivity-adjusting lamp is lit and the fan 2 continues rotating through actuation of delay-off circuit 531, 54, 55 and 57 shown in FIG. 2. The knob 8 is stopped at this point; then if smoke accumulates and enters through the inlet 6, an electronic circuit is actuated and automatically activates the fan'2 into high speed operation.
  • Numeral 10 indicates a detecting element provided with a pair of electrodes in a gas-sensitive semiconductor, being heated to a specified temperature by a weak current and having a characteristic of decreased resistance across the electrodes by the adsorption of smoke.
  • This detecting element 10 is provided inside the inlet 6.
  • FIG. 4 is a characteristic diagram of the detecting element 10, showing the relation between variation of resistance value R(ko) and time t(minutes) on the ordinate and abscissa, respectively.
  • R(ko) resistance value
  • time t(minutes) time t(minutes) on the ordinate and abscissa
  • FIG. 4 when heating current and voltage are supplied, the resistance value radically drops during about the first seconds, but becomes stable in about 5 minutes at the specified resistance value.
  • the dotted line indicates such radial decline of resistance value by the adsorption of smoke at such stage.
  • Numeral 11 indicates an AC source terminal, to which usually volts is applied.
  • Numeral 12 indicates a motor for the fan, wherein a branch connecting a speed control coil 13, a capacitor 14 and an auxiliary coil 15 of the motor in series and a main coil 16 of the motor are connected in parallel.
  • This motor 12 runs at a high speed when an AC voltage is applied across its terminals a-b, and runs at a low speed when the same voltage is applied across its terminals c-b and the coil 13 connected between the terminals a-c is shortcircuited.
  • Numeral 17 indicates an electromagnetic coil for opening and closing a shutter connected in parallel with said motor 12 for the fan 2, and numeral 18 indicates a switch for changing over among manual-high, manual-low and automatic operations by means of the pull string 3.
  • the switch 18 comprises a manual-low speed operation contact 19, a manual high-speed operation contact 20 and an automatic operation contact 21.
  • Numeral 22 indicates a switch interlocked to said switch 18 and adapted to be turned ON when said switch 18 is connected to said low contact 19 or high contact 20 and to be turned OFF when switch 18 is changed over to said automatic contact 21.
  • this switch 22 The function of this switch 22 is to keep the electromagnetic coil 17 continuously excited while the moving arm of switch 18 is being changed over from the low contact 19 to the high contact 20 or while being suddenly changed over from the manually selected low contact 19 or high contact 20 to the automatic high operation in order to expel smoke. This entirely eliminates the bothersome noise of a flapping shutter.
  • neon lamps are preferably used, one of which is on while the other is off.
  • Numeral 23 indicates a series resistor of the automatic lamp 4
  • numeral 0 and 24 indicate series resistors of the manual lamp 5
  • numeral 25 indicates a by-pass resistor connected in parallel with a branch consisting of series connection of the automatic" lamp 4 and the series resistor 23.
  • Numeral 26 indicates a switch of an electromagnetic relay 29 comprising a normal-closed contact 27 and a normal-open contact 28, which switch 26 is changed over from the side of normal-closed contact 27 to the side of normal-open contact 28 by excitation of an electromagnetic-coil 30; in other words, while the density of smoke is below a specified value and the fan is in operation by the manual high contact 20 or low contact 19 selected by the switch 18 with the pull string 3, the normal-open contact 28 of the switch 26 is OFF and the normal-closed contact 27 is ON.
  • This circuit comprises an adjusting circuit A including the detecting element l0.
  • an amplifying circuit for amplifying the signal of the adjusting circuit
  • a delay-off circuit D for driving the fan for a specified period after cutting off the amplifying circuit.
  • Numeral 31 indicates a power transformer, numeral 32 a diode for rectification, and numeral 33 a capacitor for reducing ripple.
  • Numeral 34 indicates a resistor connected between the electrodes of said detecting element in order to limit variation of output corresponding to the variation of resistance of said detecting element 10 from moisture and heat.
  • the primary winding of transformer 31 is connected to the AC. input terminal 11.
  • the upper secondary winding feeds a DC. current through rectifier 32 to transistors 40, 43 and 55 and so forth.
  • the lower secondary winding or transformer 31 moderately heats the element 10.
  • Numeral 35 indicates a series resistor for the detecting element 10, and numeral 36 a variable resistor for compensating the threshold sensitivity.
  • Numeral 37 indicates a semi-fixed resistor for preset adjustment to start the fan by detecting smoke while in the automatic operation with the adjusting knob 8 in its halfway position. Resistors 34, 35, 36 and 37 are all of high resistance and, consequently the DC. electronic circuit receives very little current through these resistors.
  • Numeral 38 indicates a variable resistor to be turned by the adjusting knob 8 for manual setting.
  • Numeral 39 is a diode connected across the base and the emitter of a transistor 40 and numeral 41 is a resistor connected to the collector of the transistor 40.
  • Numeral 42 is a coupling capacitor connected between the collector of the transistor 40 and the base of a transistor 43 while numeral 44 is a diode connected across said coupling capacitor 42 and the base of said transistor 43.
  • numerals 45, 46 & 47 are resistors
  • numeral 48 is an electromagnetic coil of an electromagnetic relay 49 connected to the collector of said transistor 43
  • numeral 50 is a switch of said electromagnetic relay 49 having a normal-closed contact 51 and a normal-open contact 52
  • numeral 53 is a smoothing condenser connected across said electromagnetic coil 48.
  • Numeral 531 indicates a capacitor connected between the normal-open contact 52 of said switch and the positive outlet of the power source
  • numeral 54 is a resistor connected between said normal-open contact 52 and the base of a transistor 55
  • numeral 56 is a diode for protection from surge voltage connected in parallel with the electromagnetic coil 30 connected to the collector of said transistor 55
  • numerals 57 and 58 are resistors.
  • Adjusting circuit includes such elements as the detecting element 10, the variable resistor 38, the semi-fixed resistor 37, and the threshold-compensating variable resistor 36, etc.
  • the electric potential to drive the transistor 40 ON must be determined in relation with the size of output of the detecting element 10.
  • the adjustment of this base potential is made by turning the sensitivity-adjusting knob 8 and thereby moving the sliding piece of the variable resistor 38.
  • the adjusting knob 8 is turned to the L side, a sliding piece of the variable resistor 38 slides toward the variable resistor 36 for compensating the threshold sensitivity and the base input voltage of the transistor 40 is divided to low voltage, and hence, the transistor 40 does not become ON until smoke reaches a certain density.
  • the sliding piece of the variable resistor 38 slides toward the semi-fixed resistor 37 and raises the base potential of the transistor 40.
  • the AC output of the collector of the transistor 40 which imparts the AC output to the collector even if the density of smoke or gas is small and the AC voltage output is small, is applied to the base of the transistor 43 via the capacitor 42 and the diode 44 and turns the transistor 43 ON. Accordingly, the electromagnetic coil 48 connected to said collector of the transistor 43 is excited, opening the normal-closed contact 51 of the switch 50 and shifting switch 50 to contact 52.
  • the sensitivity-adjusting lamp 9 is turned off, and the transistor is turned ON since the current flows in its base through the resistors 54 and 58.
  • the electromagnetic coil 30 on the collector side is excited and the normal-open contact 28 of the switch 26 is turned ON, driving the fan motor 12 into high speed operation regardless of the position of the switches 18 and 22.
  • the adjusting knob 8 is slowly turned toward the L side into a position where the transistor 40 goes OFF at a certain point. Therefore, the switch 50 reverts to its normally closed contact 51 lighting the sensitivityadjusting lamp 9.
  • the adjusting knob 8 is set at this lighting position to complete sensitivity-adjustment.
  • the transistor 55 is kept ON for a specified duration and the electromagnetic coil 30 connected to the collector is kept excited, and hence, the normal-open contact 28 of the switch 26 is also kept ON, keeping the fan motor 12 in actuation for said specified duration.
  • the transistor 55 goes OFF and the electromagnetic coil 30 stops excitation, making the normal-closed contact 27 of the switch 26 ON, and hence, stopping the fan 2 if the switches 18 and 22 are in automatic setting, or returning the motor to low speed running if the switches l8 and 22 are set for low speed operation.
  • the delay-off circuit D consists of the capacitor 531, the resistor 54, the transistor 55 and the resistor 57, and provides the advantage of expelling smoke remaining in remote corners of room by keeping the fan 2 rotating for a specified period after smoke has been cleared away from the main of room. In absence of such delay-off circuit part D, the fan 2 would stop rotating when smoke no longer exists around the inlet 6, and hence, smoke in remote corners of room would very likely remain there.
  • FIG. 3 shows a modified example. This example is basically the same as that of FIG. 2, except for that it lacks the sensitivity-adjusting lamp 9, and therefore the sensitivity-adjustment is done by watching the fan 2 stop and then by turning the knob 8.
  • Other constituent parts corresponding to those shown in FIG. 2 carry the same numerals, to which the descriptions made refer ring to FIG. 2 shall apply.
  • numeral 59 indicates a switch connected in series to the capacitor 531. If this switch 59 is kept OFF, the delay-off device does not work, and hence, when the output of the detecting element 10 is extinct, the transistor 55 becomes immediately OFF, but if this switch 59 is kept ON, the delay-off circuit D is kept working by the capacitor 531 as in FIG. 2, and consequently, the halt of rotation of the fan can be delayed for the discharging period of the capacitor 531 after extinction of output of the detecting element as in the example shown in FIG. 2.
  • the transistor 43 is turned ON, also turning the transistor 55 ON, causing the electromagnetic coil 30 connected to its collector to be excited and the switch 26 to be changed over to activate the fan motor 12 into high speed operation.
  • the switch 59 is already OFF, and hence, the transistor 55 becomes OFF. Accordingly, the normal-open contact 28 of the switch 26 becomes OFF and the fan stops.
  • the fact that transistor 40 is now OFF can be ascertained by stopping the motor. Therefore, if the adjusting knob 8 is set while watching the rotation of the motor 12, the detecting element It) reduces the resistance value when it subsequently detects smoke and the base potential of the transistor 40 relatively rises, and thus the fan motor 12 can be driven.
  • a change-over between automatic and manual operations can be made by means of the pull string 3.
  • automatic operation it can be done by connecting the switch 18 to the automatic contact 21, which means that the fan is in a waiting pause for smoke.
  • This ventilator is usually installed above a gas range or water geyser liable to produce smoke when in use in a kitchen. Such smoke enters the inlet 6 of the ventilating fan and contacts the detecting element 10, thereby lowering the resistance value considerably and sending an AC signal to the base of the transistor 40. Then the electronic circuit is actuated as described, driving the fan 2 into high speed operation, and simultaneously, sending exciting current to the electromagnetic coil 17 which then opens the shutter to expel smoke or gas. At this time, the automatic lamp 4 is lit and the manual lamp 5 is off.
  • the resistance value of the detecting element 10 drops and turns the transistor 40 ON by imparting a voltage to its base, whereby the switch 26 of the relay 29 is changed over to the normalopen contact 28 ceasing said short-circuiting of the speed control coil 13, and the fan motor 12 is operated at high speed.
  • the ventilator of this invention can be automatically changed over to high speed operation by automatically switching the electronic circuit whenever the detecting element detects smoke or gas. Therefore, this ventilator has the characteristic of being able not only to start automatically from the inoperative state but also it changes over automatically from low speed operation to high speed operation to effect quick ventillation. Thus this ventilator is able to change over from any state into high speed operation by means of the switch 26 of the electromagnetic relay 29 instantly upon detecting smoke.
  • the ventilator of this invention has the switch 22 which keeps the shutter open during the changing over from manual to automatic operations, the electromagnetic coil 17 is kept excited in all cases of change-over and avoids flapping noise of the shutter.
  • the ventilator of FIG. 2 has an advantage of making sensitvity adjustment very easy by isolating the sensitivity-adjusting part and the delay-off part of the electronic circuit by means of the switch 50 of the electromagnetic relay 49 and simultaneously flickering the sensitivity-adjusting lamp 9, and also by isolating the delay-off part and flickering the sensitivity-adjustment lamp irrespectively of the rotation of the fan, when adjustment is made.
  • the ventilator of FIG. 3 has the advantage of making sensitivity-adjustment by opening the switch 59 to deactivate of the delay-off circuit and watching the movement of the fan motor, without using the sensitivityadjusting lamp.
  • the vantilator of this invention has the advantage of accurately adjusting sensitivity within the turning range of the adjusting knob 8 because the sensitivityadjusting part is provided with the variable resistor 36 for compensating threshold sensitivity as well as the semi-fixed resistor 37 for adjusting change-over point.
  • the ventilator of this invention has the further advantage of making alternate lamp indications, for instance, when the automatic lamp 4 is on, then the manual lamp 5 is off, and vice-versa, in accordance with selection of the operations.
  • a ventilator system including a ventilating fan comprising: a smoke detecting element;
  • a fan motor for driving the ventilating fan, said motor being operable at a low speed and a high speed;
  • a manual change-over switch having a high speed position, a low speed position and an automatic position and associated contacts, operably connected to said fan motor;
  • said electronic circuit means comprises an electromagnetic relay and a normally open switch, said electromagnetic relay connected to said normally open switch such that activation of said relay when smoke is detected closes said normally open switch, said switch being connected to said main coil of said fan motor when closed, thereby driving said motor at high speed.
  • a delay-off circuit means operatively connected to said electronic circuit means for maintaining said fan motor in its high speed position for a predetermined time period after said detecting element no longer detects smoke;
  • switch means connected to a ventilating window shutter for keeping said shutter open when said fan motor changes speed.
  • said electronic circuit means further comprises means for adjusting the threshold sensitivity of the system to smoke, said means including a sensitivity adjusting lamp and a manual switch for isolating said delay-off circuit means.
  • said electronic circuit means further comprises means for adjusting the threshold sensitivity of the system to smoke and gas, said means including a sensitivity adjusting lamp and a switch connected to said lamp and said delay-off circuit means for controlling said sensitivity adjusting lamp during adjustment and for setting said delay-off circuit means.
  • said sensitivity adjusting means further comprises a first variable resistor for adjusting threshold sensitivity, a semi-fixed resistor for positioning an adjusting knob within the adjustable range of said knob and a second variable resistor for adjusting the working sensitivity of said electronic circuit means.
  • the device of claim 1 further comprising an automatic operation indication lamp connected to automatic operation contact of said manual change-over switch and a manual operation indication lamp connected to both the high speed operation contact and said low speed operation contact of said manual change-over switch whereby said manual operation indication lamp becomes operative when either of said high speed and low speed contacts are in use and circuit means operatively connected to said lamps for alternative operation of said lamps.
  • a ventilating fan system including a fan comprising: a sensitivity-adjusting circuit including a detecting element (10); an amplifying circuit for amplifying signals detected by said sensitivity-adjusting circuit; a delay-off circuit for keeping the fan rotating after said amplifying circuit is isolated the sensitivity-adjusting circuit and the amplifying circuit being operably coupled and the amplifying circuit and the delay-off circuit being coupled through a switch (50) of an electromagnetic relay (49),; and an output circuit connected to said delay-off circuit through a switch (26) of an electromagnetic relay (29).

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  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ventilation (AREA)
  • Control Of Positive-Displacement Air Blowers (AREA)
  • Thermotherapy And Cooling Therapy Devices (AREA)
US00341781A 1972-07-28 1973-03-15 Ventilation fan system with smoke detector speed control Expired - Lifetime US3826180A (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP7617872A JPS5119693B2 (ja) 1972-07-28 1972-07-28
JP47076181A JPS509094B2 (ja) 1972-07-28 1972-07-28
JP7617972A JPS4933458A (ja) 1972-07-28 1972-07-28
JP7618072A JPS4933490A (ja) 1972-07-28 1972-07-28
JP7791272A JPS509096B2 (ja) 1972-08-02 1972-08-02

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US3826180A true US3826180A (en) 1974-07-30

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US00341781A Expired - Lifetime US3826180A (en) 1972-07-28 1973-03-15 Ventilation fan system with smoke detector speed control

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US (1) US3826180A (ja)
CA (1) CA999359A (ja)
DE (1) DE2314340A1 (ja)
FI (1) FI56455C (ja)
FR (1) FR2195273A5 (ja)
GB (1) GB1424616A (ja)
IT (1) IT984430B (ja)
NL (1) NL153994B (ja)
NO (1) NO137708C (ja)
SE (1) SE392155B (ja)

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US9053626B2 (en) 2011-05-02 2015-06-09 Daydream Believers, Llc Programmable carbon monoxide safety device
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CN106194795A (zh) * 2016-08-24 2016-12-07 合肥超赢工业设计有限公司 一种节能工业排风扇
CN107091241A (zh) * 2017-06-29 2017-08-25 苏州见真物联科技有限公司 一种红外感应智能风扇
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US7683794B2 (en) 2007-05-15 2010-03-23 David Contreras Carbon monoxide safety system for preventing entry into a dwelling containing toxic gases
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US9053626B2 (en) 2011-05-02 2015-06-09 Daydream Believers, Llc Programmable carbon monoxide safety device
US20120318878A1 (en) * 2011-06-18 2012-12-20 Custom Electronics Limited Controlling Smoke and Heat Evacuation and Ventilation Devices
US20160305244A1 (en) * 2013-12-06 2016-10-20 Tunnel Air Systems AS System and method for extraction of smoke from road tunnels
US20160023770A1 (en) * 2014-07-25 2016-01-28 Nathan Thompson Air heating apparatus useful for heating an aircraft interior
CN106194795A (zh) * 2016-08-24 2016-12-07 合肥超赢工业设计有限公司 一种节能工业排风扇
CN107091241A (zh) * 2017-06-29 2017-08-25 苏州见真物联科技有限公司 一种红外感应智能风扇
US11208839B2 (en) * 2020-03-03 2021-12-28 Gmi Holdings, Inc. Space venting upward acting door system and method

Also Published As

Publication number Publication date
NL7304301A (ja) 1974-01-30
IT984430B (it) 1974-11-20
NL153994B (nl) 1977-07-15
FI56455C (fi) 1980-01-10
GB1424616A (en) 1976-02-11
FI56455B (fi) 1979-09-28
DE2314340A1 (de) 1974-02-14
NO137708C (no) 1978-04-12
FR2195273A5 (ja) 1974-03-01
CA999359A (en) 1976-11-02
NO137708B (no) 1977-12-27
SE392155B (sv) 1977-03-14

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