The specific embodiment
The below describes embodiments of the invention in detail, and the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or the element with identical or similar functions from start to finish.Be exemplary below by the embodiment that is described with reference to the drawings, only be used for explaining the present invention, and can not be interpreted as limitation of the present invention.
In description of the invention, it will be appreciated that, term " vertically ", " laterally ", " on ", orientation or the position relationship of the indications such as D score, 'fornt', 'back', " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward " be based on orientation shown in the drawings or position relationship, only be for convenience of description the present invention and simplified characterization, rather than indication or the hint device of indication or element must have specific orientation, with specific orientation structure and operation, therefore can not be interpreted as limitation of the present invention.
In addition, term " first ", " second " only are used for describing purpose, and can not be interpreted as indication or hint relative importance.
In description of the invention, unless otherwise prescribed and limit, need to prove, term " installation ", " linking to each other ", " connection " should be done broad understanding, for example, can be mechanical connection or electrical connection, also can be the connection of two element internals, can be directly to link to each other, and also can indirectly link to each other by intermediary, for the ordinary skill in the art, can understand as the case may be the concrete meaning of above-mentioned term.
Below with reference to Fig. 1 and Fig. 2 the refrigerator 100 that door is opened delay alarm that has according to the embodiment of the invention is described.
As depicted in figs. 1 and 2, the refrigerator 100 of opening delay alarm that has that the embodiment of the invention provides comprises: casing 50, revolving door body 60, detection module 10, detection time delay module 20, control module 30 and alarm 40.Wherein, revolving door body 60 is installed on the casing 50 by hinge, has the first K switch 1 in the detection module 10, detects in the time delay module 20 to have second switch K2; Detection module 10 is by the opening of the state-detection revolving door body 60 of the first K switch 1, when detecting revolving door body 60 and be in opening, and detection module 10 outputs the first start signal; Detect time delay module 20 by the opening of the state-detection revolving door body 60 of second switch K2, when detecting revolving door body 60 and be in opening, detect time delay module 20 outputs the second start signal after the time-delay Preset Time; Control module 30 all links to each other with detection time delay module 20 with detection module 10 respectively, is used for starting alarm 40 after the second start signal that the first start signal that detects detection module 10 outputs and detection time delay module 20 are exported and carries out warning functions.
As shown in Figure 2, revolving door body 60 is connected on the casing 50 by hinge 70.Line direction between the first K switch 1 and the second switch K2 is along the direction perpendicular to hinge 70, the first K switch 1 and second switch K2 each interval preset distance, and the distance of the first K switch 1 and hinge 70 is greater than the distance of second switch K2 and hinge 70.
As shown in Figure 3, detection module 10 comprises the first ac input end A point, the second ac input end B point, the first K switch 1 and rectification step-down submodule.One end of the first K switch 1 links to each other with the first ac input end A point, and the first K switch 1 conducting when revolving door body 60 is opened, the first K switch 1 disconnected when revolving door body 60 was closed.The first input end of rectification step-down submodule links to each other with the other end of the first K switch 1, the second input of rectification step-down submodule links to each other with the second ac input end B point, rectification step-down submodule is used for the alternating voltage of input is carried out capacitance-resistance rectification step-down to form DC voltage, and by DC voltage for detecting time delay module 20, control module 30 and alarm 40 power supplies, and take this DC voltage as the first start signal.
In one embodiment of the invention, the first ac input end A point, the second ac input end B point can be inputted the power frequency forceful electric power signal of 220V/50Hz between the two, are converted into 5V direct current weak electric signal VCC for other module work behind rectification step-down submodule.
In one embodiment of the invention, according to electrical safety general knowledge, switch should join with zero line, is the zero line input therefore the first ac input end A point is preferably arranged, and the second ac input end B point is the live wire input.
In one embodiment of the invention, rectification step-down submodule adopts the technology of the common resistance-capacitance type rectification reduction voltage circuit in this area to realize rectification step-down purpose, comprise bleeder resistor R1, decompression capacitor C1, bridge rectifier diode, be respectively the first diode D1 to the four diode D4, zener diode (ZD), filter capacitor C2 and filter resistance R2.It is pointed out that this resistance-capacitance type rectification reduction voltage circuit only is for exemplary purposes, rather than in order to limit protection scope of the present invention.
Detect time delay module 20 and comprise second switch K2, capacitor C 3 and driven element module.The end of second switch K2 links to each other with rectification step-down submodule, and second switch K2 disconnects when revolving door body 60 is opened, and when revolving door body 60 is closed, utilizes the magnetic door seal on the refrigerator to make second switch K2 conducting.One end of capacitor C 3 links to each other with the other end of second switch K2, the other end ground connection of capacitor C 3.Capacitor C 3 is charged according to the DC voltage of rectification step-down submodule output when second switch K2 is closed.When second switch disconnected, capacitor C 3 complete charge began discharge.In the discharge process, triode Q1 in the driven element module and triode Q2 conducting, voltage between capacitor C 3 two ends reduces gradually, triode Q1 and triode Q2 turn-off when the voltage at capacitor C 3 two ends is under the triode conducting voltage, by second start signal of VCC through 4 pairs of control modules of resistance R, 30 output high level.
In one embodiment of the invention, second switch K2 is tongue tube.Tongue tube is a kind of switch of magnetosensitive, and tongue tube is simpler than common mechanical construction of switch, volume is little, speed is high, long working life; And compare with electronic switch, it has again the characteristics such as anti-load shock ability is strong, and functional reliability is very high.
In one embodiment of the invention, capacitor C 3 is electrochemical capacitor.Electrochemical capacitor is compared with other electric capacity, has the large characteristics of capacitance per unit volume amount, and rated capacity can accomplish greatlyr, and has advantage cheap and easy to get.
In one embodiment of the invention, detect the Preset Time of time delay module by the capacitance adjustment of adjusting capacitor C 3.Particularly, the capacitance of capacitor C 3 is larger, and Preset Time is longer.
Control module 30 is after receiving the first start signal that detection module 10 sends and detecting the second start signal that time delay module 20 sends, and the output high level signal is to drive the alarm in the alarm 40.
In one embodiment of the invention, control module 30 also comprises and judges submodule, be used for after the second start signal that the first start signal that receives detection module output and detection time delay module are exported, above-mentioned two start signal being carried out and operation with the judgement submodule.When the first start signal and the second start signal were high level, then alarm 40 was warned.
In one embodiment of the invention, adopt the 5th diode D5 and two discrete components of the 6th diode D6 to realize logical “and”.It is pointed out that this mode only for exemplary purposes, rather than in order to limit protection scope of the present invention.
Alarm 40 comprises alarm element 41 and warning drive circuit.When 30 pairs of alarm 40 input high level signals of control module, the alarm drive circuit drives alarm element 41 and reports to the police, and the user is reminded.Particularly, when 30 pairs of alarm 40 input high level signals of control module, 60 times of opening the door of expression revolving door body this moment surpass Preset Time, need to send the alarm signal reminding user.Wherein, alarm element 41 can be buzzer and/or alarm lamp.For example, when alarm element 41 is buzzer, the voice signal by sending certain hour length or with the voice signal of preset frequency with reminding user.When alarm element 41 is alarm lamp, by send the optical signal reminding user of flicker with preset frequency.
In an example of the present invention, alarm 40 is installed in the side near hinge 70, and the first K switch 1 then is installed in the side away from hinge 70.Thereby, to open the door with at closing time the user, it is poor that the action of the first K switch 1 and second switch K2 has the regular hour.Detecting time delay module 20 utilizes the above-mentioned time difference that electrochemical capacitor C3 is charged.
The below's contact Fig. 1 to Fig. 3 describes the duty that door is opened the refrigerator of delay alarm that has of the present invention's proposition.
At first it is to be noted, as indicated above, distance between the first K switch 1 and the hinge 70 is greater than the distance between second switch K2 and the hinge 70, therefore refrigerator revolving door body 60 opens or closes in a flash, it is poor that 1 action of the first K switch and second switch K2 action have certain hour.
When the moment that revolving door body 60 is opened, 1 conducting of the first K switch, detection module 10, detection time delay module 20, control module 30 and alarm 40 power on, and detect time delay module 20 beginning timing.Rectification step-down submodule in the detection module 10 is converted into direct current light current VCC output with industrial-frequency alternating current, and to the first start signal of control module 30 input high levels.At this moment, originally second switch K2 keeps closure state momently, disconnects after a while.Second switch K2 keep closed during this period of time in, capacitor C 3 quick charges, simultaneously triode Q1, triode Q2 conducting, 20 pairs of control module 30 output low levels of the second detection module.After second switch K2 disconnected, capacitor C 3 began discharge.By the time after capacitor C 3 was discharged fully, if revolving door body 70 is not closed yet at this moment, then second switch K2 still for disconnecting, detected the second start signal of time delay module 20 input high levels.When control module 30 receives the first start signal and the second start signal and is high level signal, to alarm 40 input high level signals, drive alarm element 41 and report to the police.
In one embodiment of the invention, detection module 10, detection time delay module 20, control module 30 and alarm 40 can be integrated on PCB (PrintedCircuitBoard, the printed circuit board (PCB)) plate.This pcb board can be installed in the mounting groove of the top of casing 50 reserving.And this pcb board can directly be connected in the major loop of the first K switch 1, thus turning on and off by the integrated function of the first K switch 1 control pcb board.
In the description of this specification, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present invention or the example in conjunction with specific features, structure, material or the characteristics of this embodiment or example description.In this manual, the schematic statement of above-mentioned term not necessarily referred to identical embodiment or example.And the specific features of description, structure, material or characteristics can be with suitable mode combinations in any one or more embodiment or example.
Although and illustrate and described embodiments of the invention, those having ordinary skill in the art will appreciate that: in the situation that do not break away from principle of the present invention and aim can be carried out multiple variation, modification, replacement and modification to these embodiment, scope of the present invention is limited by claim and equivalent thereof.