A kind of refrigerator with the formaldehyde examination device
Technical field
The utility model relates to a kind of refrigerator, is specifically related to a kind of refrigerator with the formaldehyde examination device, belongs to the refrigerator production technical field.
Background technology
In recent years, along with the improvement of people's housing condition, acquired new furniture, the phenomenon of the chamber that embellishes the new house is more and more general, but simultaneously in the room air composition and the content of pernicious gas also increasing, wherein general with formaldehyde and endanger huge.Whether content of formaldehyde exceeds standard and has become numerous consumer demands in the detection air, but in the market common checkout gear exist complex operation, price high, be unsuitable for the shortcoming such as long term monitoring, and the relevant formaldehyde examination device of ornaments can take the interior space separately, affects indoor attractive in appearance, clean and tidy.
The utility model content
For the deficiency that prior art exists, technical problem to be solved in the utility model is, a kind of refrigerator with the formaldehyde examination device is provided, and intuitively as seen testing result can detect for a long time content of formaldehyde, and the refrigerator monnolithic case is succinctly attractive in appearance.
For solving the problems of the technologies described above, technical solution adopted in the utility model is, a kind of refrigerator with the formaldehyde examination device, at refrigerator the formaldehyde examination device is set, its formaldehyde examination device connects refrigerator circuit, and the formaldehyde examination device comprises the formaldehyde sensing module, and the formaldehyde sensing module connects the signal amplification module, signal amplification module and transformational analysis module communication, the transformational analysis module connects display window.
The above-mentioned refrigerator with the formaldehyde examination device, its formaldehyde sensing module is for detecting the semiconductor type sensor of content of formaldehyde.
The above-mentioned refrigerator with the formaldehyde examination device, its signal amplification module is amplifying circuit, receives the voltage analog signal of formaldehyde sensing module transmission and amplifies this signal.
The above-mentioned refrigerator with the formaldehyde examination device, its transformational analysis module comprises the master board of analyzing and processing signal data, master board connects the refrigerator display panel circuit that amplifying signal is carried out the A/D conversion process.
The above-mentioned refrigerator with the formaldehyde examination device, its master board connects alarm.
The above-mentioned refrigerator with the formaldehyde examination device, its formaldehyde examination device is embedded on the refrigerator freezing door, and the formaldehyde examination crust of the device arranges passage.
Refrigerator with the formaldehyde examination device of the present utility model makes refrigerator have the formaldehyde of detection and warning function.
The formaldehyde examination device connects refrigerator circuit, provides power supply by refrigerator, the continuation that assurance detects and stability, and simultaneously effective reduced volume is convenient to be embedded in refrigerator door or the shell.
The formaldehyde sensing module adopts the semiconductor type sensor to detect content of formaldehyde free in the air that enters passage, and convert corresponding voltage analog signal to, after the amplifying circuit amplification of this voltage analog signal by the signal amplification module, by the refrigerator display panel circuit this signal is carried out the A/D conversion process and obtain data signal, and by master board, that is: refrigerator display panel MCU carries out analyzing and processing to data signal, be presented on the display window after drawing testing result, if the testing result severe overweight then starts alarm.
The utlity model has following advantage and useful technique effect:
1, easy to operate, testing result intuitively as seen, average family can carry out indoor formaldehyde content and detect, and need not by professional testing agency or buys professional instrument.
2, with low cost, PARA FORMALDEHYDE PRILLS(91,95) checkout gear power supply, transformational analysis module and display window all can use refrigerator to have hardware, need not to increase extra cost, so testing cost is lower than other detection modes, and average family all can be accepted.
3, can monitor by long-term, stable PARA FORMALDEHYDE PRILLS(91,95) content, uninterruptedly show in real time testing result, rather than through showing disposable result after the long-time sample detecting.
4, detect accurately, be quick on the draw, can judge pollution level according to testing result, when serious pollution, can reach alarm.
5, the formaldehyde examination device is hidden in the refrigerator freezing door inboard, and volume is little, does not take the interior space, also can not affect refrigerator outward appearance and overall performance.
Description of drawings
Fig. 1 is structured flowchart of the present utility model;
Fig. 2 is formaldehyde sensing module circuit diagram of the present utility model;
Fig. 3 is the utility model signal amplification module circuit diagram;
Fig. 4 is use view of the present utility model.
In the above-mentioned accompanying drawing:
The 1-refrigerator, 2-formaldehyde examination device, 3-refrigerator circuit, 4-formaldehyde sensing module, 5-signal amplification module, 6-transformational analysis module, 7-display window, 8-master board, 9-refrigerator display panel circuit, 10-alarm, 11-passage.
The specific embodiment
Such as Fig. 1 and shown in Figure 4, the refrigerator with the formaldehyde examination device of present embodiment arranges formaldehyde examination device 2 at refrigerator 1, and formaldehyde examination device 2 is embedded on refrigerator 1 door of refrigerator, and formaldehyde examination device 2 shells arrange passage 11.Formaldehyde examination device 2 connects refrigerator circuit 3, and formaldehyde examination device 2 comprises formaldehyde sensing module 4, and formaldehyde sensing module 4 connects signal amplification module 5, signal amplification module 5 and 6 communications of transformational analysis module, and transformational analysis module 6 connects display window 7.Formaldehyde sensing module 4 is for detecting the semiconductor type sensor of content of formaldehyde.Signal amplification module 5 is amplifying circuit, receives the voltage analog signal of formaldehyde sensing module transmission and amplifies this signal.Transformational analysis module 6 comprises the master board 8 of analyzing and processing signal data, and master board 8 connects the refrigerator display panel circuit 9 that amplifying signal is carried out the A/D conversion process.Master board 8 connects alarm 10.
As shown in Figure 2, formaldehyde sensing module 4 is selected the semiconductor type sensor, provides 5V voltage by refrigerator circuit, and the working sensor condition is: between the environment temperature-10 ℃ ~ 50 ℃, humidity is lower than the condensation point, meets home environment fully.The operation principle of formaldehyde sensing module is: with the increase of content of formaldehyde in the air, the resistance of circuit inductance resistance R s in the formaldehyde sensing module will diminish, its concrete Changing Pattern can be with reference to the β (Rs of selected formaldehyde sensing module, gas/Rs, air) value change curve, the variation of Rs resistance causes the variation of output voltage V out.By regulating trimmer potentiometer VR, the PARA FORMALDEHYDE PRILLS(91,95) sensing module is calibrated, and guarantees that reference voltage is accurate.
As shown in Figure 3, signal amplification module 5 is selected the LMV324I operational amplifier that the Vout analog voltage signal is carried out the multichannel amplification and is processed, output analog voltage signal ADC_SENSOR.Analog voltage signal ADC_SENSOR carries out the A/D conversion process by refrigerator display panel circuit 9, and master board 8 refrigerator master board MCU carry out analyzing and processing to the data signal that obtains, and draw testing result.
Result of determination with formaldehyde examination is divided into Three regions in advance: be pollution-free when content of formaldehyde is lower than the 0.1mg/m3 that stipulates among the GB-18883; It is intermediate pollution when content of formaldehyde is between 0.1mg/m3 ~ 0.3mg/m3; It is serious pollution when content of formaldehyde is higher than 0.3mg/m3.
When refrigerator master board MCU judges which interval detected value belongs to, and result of determination is presented on the display screen, the user can understand intuitively pollution condition rather than only see detection numerical value,
If the testing result severe overweight then starts alarm 10.
Unaffected for guaranteeing the refrigerator product front appearance, the formaldehyde examination device is installed in the chamber door side, and its concrete mounting means is: with the embedded reveal face that is fixed in of mounting box, then formaldehyde examination device 2 is installed in the door foaming operation, connect the refrigerator inside circuit, end cap is installed at last.End cap is concordant with the door body side surface, does not affect outward appearance.A plurality of passages 11 are arranged on the end cap, unaffected to guarantee formaldehyde sensor sensitivity.
The above, only be to preferred embodiment of the present utility model, be not to be that the utility model is done other forms of restriction, any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the equivalent embodiment of equivalent variations.But every the utility model scheme content that do not break away to any simple modification, equivalent variations and remodeling that above embodiment does, still belongs to protection domain of the present utility model according to technical spirit of the present utility model.