CN2716772Y

CN2716772Y - Demister for glass door of refrigerating equipment

Info

Publication number: CN2716772Y
Application number: CN 200420029029
Authority: CN
Inventors: 孙登顺
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-05-24
Filing date: 2004-05-24
Publication date: 2005-08-10
Anticipated expiration: 2014-05-24

Abstract

A demister for glass door of refrigerating equipment of the utility model comprises a sensing component, a shock circuit, a microprocessor, a driving controller and a heater; wherein, the output end of the sensing component is connected with the input end of the shock circuit; the output end of the shock circuit is connected with the microprocessor; the microprocessor is connected with the input end of a driving control circuit; the output end of the driving control circuit sends out a driving control signal to control the movement of the heater; the sensing component is a capacitance sensing component consisting of two parallel elongated brass sheets; the heater is a heating component which is stuck at the glass door of refrigerating equipment and can generate heat energy for demisting. Therefore, with the feature of the capacitance value of the sensing component varying along with the various humidity on the glass door of refrigerating equipment, the output shock frequency of the shock circuit can be altered so as to timely drive and control the demisting heater to start and stop. The utility model has the advantages of cost reducing and electric force waste avoiding.

Description

Refrigerating equipment glass door demister

Technical field

The utility model relates to a kind of demister of refrigerating equipment, relate in particular to a kind of simple structure, and accurate sensing and in good time drive control demist heater switching motion, and then reach and reduce cost, the refrigerating equipment glass door demister of power wastage avoided.

Background technology

For refrigerating equipment (as: freezer goods showing cabinet, displaying refrigerator) with glass door, because device interior and the temperature of outside and the difference of humidity, so there is knot mist (or claiming dewfall) phenomenon generation in regular meeting on the glass door; The degree that this kind phenomenon produces, especially can be subjected to influence that various external factors change and different, for example: the frequent degree of glass door switch, the variation of weather (weather and cold and hot) etc., and in order to solve this problem that hazes, this type of refrigerating equipment is usually all with demister.And this type of present refrigerating equipment is normally installed heating wire on the glass door, and the power-on of all-weather is with the heating demist, though it can allow haze degree that phenomenon takes place reduce to minimumly, also causes unnecessary electric power to expend.Because under most situation, especially when not opening glass door for a long time, the frequency that the phenomenon that hazes produces may be lower, and therefore constantly the heating demist will cause most of power consumption waste, and also increase the load of refrigerating equipment greatly, and cost is improved.

On glass door, directly install heating wire for solving above-mentioned refrigerating equipment, and the power-on of all-weather heats the shortcoming that unnecessary electric power that demist produces expends, a kind of power conservation type demist control device (the one nine seven eight five No. five patent of TaiWan, China) is devised then, it mainly is to utilize a surface temperature detecting meter of being located on the body surface, one is located at object air outside dry-bulb temperature detecting meter, and one be located at object air outside wet-bulb temperature detecting meter and wait three detecting meters as sensing component, by measured real surface temperature are counted in three detectings, dry-bulb temperature and wet-bulb temperature reading are delivered in the electronic type calculating comparator and are done computing, calculate surface control temperature after trying to achieve dew-point temperature, compare with the real surface temperature again, in good time then driving control relay makes the heater action, to reduce unnecessary power supply waste.

But above-mentioned patent " power conservation type demist control device ", though can reduce unnecessary power supply waste, reach purpose of power saving, but because circuit design is too complicated, especially must be by surface temperature detecting meter, air dry-bulb temperature detecting meter, air ' s wet bulb temperature detecting meter waits three detecting meters as sensing component, and these three kinds detecting meters belong to accurate sensing component, except costing an arm and a leg, and maintenance is difficult for, therefore at refrigerating equipment above-mentioned this power conservation type demist control device is installed, to significantly improve procuring equipment cost and maintenance cost in the future, so that the demist mode of directly installing heating wire with existing refrigerating equipment on glass door compares, can not cut operating costs, therefore this power conservation type demist control device on market all the time not by extensively a large amount of employing.

The utility model content

In order to overcome the above-mentioned shortcoming that existing refrigerating equipment demister exists, the utility model provides a kind of refrigerating equipment glass door demister, the utlity model has simple structure, and accurate sensing and in good time drive control demist heater switching motion, and then reach and reduce cost, avoid the advantage of power wastage.

The technical scheme that its technical problem that solves the utility model adopts is:

A kind of refrigerating equipment glass door demister, it is characterized in that, comprise sensing component, oscillating circuit, microprocessor, driving governor and heater, the input of the output of sensing component and oscillating circuit wherein, the output of oscillating circuit links to each other with little processing, microprocessor is connected with the input of Drive and Control Circuit, the action of the output output drive control signal control heater of Drive and Control Circuit; Described sensing component is a capacitive sensing assembly that is made of two parallel elongate copper sheets; Described heater is one to be attached on the refrigerating equipment glass door, can produce the heating component of heat energy demist.

Whereby, the characteristic of utilizing the capacitance of sensing component to change along with different humidity on the refrigerating equipment glass door, thereby frequency is shaken in the output that changes oscillating circuit, has simple structure, and accurate sensing and in good time drive control demist heater switching motion, reach and reduce installing demister cost, and avoid the advantage of power wastage.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is an enforcement circuit diagram of the present utility model.

Fig. 2 is an action flow chart of the present utility model.

The number in the figure explanation:

10 sensing components

20 oscillating circuits

30 microprocessors

40 Drive and Control Circuit

50 heaters

The specific embodiment

As shown in Figure 1, the utility model comprises sensing component 10, oscillating circuit 20, microprocessor 30, Drive and Control Circuit 40 and heater 50; Wherein:

Sensing component 10 is a capacitive sensing assembly that is made of two parallel elongate copper sheets, and this sensing component 10 is to be attached on the refrigerating equipment glass door, in order to the humidity on the sensing refrigerating equipment glass door; Formula C=ε (S/D) according to the junction capacitance value, that is capacitance=medium coefficient * area ÷ distance, therefore when the humidity on the refrigerating equipment glass door changes to some extent, medium coefficient between two copper sheets will change thereupon, and since the area of two copper sheets and mutual distance be all fixing, so the capacitance of sensing component 10 will be different along with the variation of humidity.

Oscillating circuit 20, it is a unstable state multi resonant oscillating circuit, its output concussion frequency will change with the capacitance variation of cross-over connection in the sensing component 10 of timing ic ICU1 TRIGGER pin, and the concussion frequency f d of output delivers in the microprocessor 30 after amplifying via a transistor Q1.

Microprocessor 30, for comparing the circuit that IC (U2) is constituted by a computing, its can will receive from the concussion frequency f d of oscillating circuit 20 outputs with the dewfall frequency f w that sets in advance, remove to reveal and stop frequency f f and carry out computing relatively, and then understand glass door on the present refrigerating equipment phenomenon that whether hazes.

Drive and Control Circuit 40, be a Drive and Control Circuit that is made of the transistor Q2 and a relay R LY1 of tool on-off action, its signal that can receive from microprocessor 30 is path ON or the OFF state that opens circuit via transistor Q2 with the contact RELAY1 that drives control relay RLY1.

Heater 50 is one to be attached on the refrigerating equipment glass door, and produces the heating component of heat energy demist can be path ON state at the contact RELAY1 of relay R LY1 the time.

As shown in Figure 2, the utility model mainly is a characteristic of utilizing the capacitance of sensing component 10 to change along with different humidity on the refrigerating equipment glass door, thereby frequency f d is shaken in the output that changes oscillating circuit 20, when the output concussion frequency f d of oscillating circuit 20 is less than or equal to the dewfall frequency f w that sets in advance, microprocessor 30 will be exported a high potential signal to Drive and Control Circuit 40, the transistor Q2 of Drive and Control Circuit 40 is triggered is conducting (ON) state, and the contact RELAY1 that drives relay R LY1 is channel status, and then make heater 50 energisings produce heat energy, reach the purpose of in good time demist; When the output concussion frequency f d of oscillating circuit 20 stops frequency f f more than or equal to the dewfall that sets in advance, microprocessor 30 will be exported a low-potential signal to Drive and Control Circuit 40, the transistor Q2 of Drive and Control Circuit 40 is by (OFF) state, and the contact RELAY1 that makes relay R LY1 recovers original opening circuit (OFF) state, and then make heater 50 be off-position, reach the power saving purpose that stops to heat.

Address embodiment shown in the drawings as can be known from above institute, the power conservation type demist control device of the utility model except lifting with above-mentioned prior art, can reach accurate sensing equally and drive control demist heater switching motion in good time, and then reach outside the purpose of power saving, its structure is more simple by contrast, especially the sensing component that is adopted only is to be made of two parallel elongate copper sheets, so its low cost of manufacture, and easy to maintenance, the difficult fault that produces, can significantly reduce procuring equipment cost and maintenance cost in the future, reach really and cut operating costs; Therefore the utility model really has obvious improvement and practicality, and really unprecedented, meets novel patent requirement, so file an application in accordance with the law.

The above, it only is preferred embodiment of the present utility model, be not that the utility model is done any pro forma restriction, every foundation technical spirit of the present utility model all still belongs in the scope of technical solutions of the utility model any simple modification, equivalent variations and modification that above embodiment did.

Claims

1. a refrigerating equipment glass door demister is characterized in that, comprise sensing component,

Oscillating circuit, microprocessor, driving governor and heater, wherein the output of sensing component is connected with the input of oscillating circuit, the output of oscillating circuit links to each other with little processing, microprocessor is connected with the input of Drive and Control Circuit, the keying of the output output drive control signal control heater of Drive and Control Circuit;

Described sensing component is a capacitive sensing assembly that is made of two parallel elongate copper sheets;

Described heater is one to be attached on the refrigerating equipment glass door, can produce the heating component of heat energy demist.