CN101509718B

CN101509718B - Air cooling refrigerator automatic defrosting system

Info

Publication number: CN101509718B
Application number: CN2009101163895A
Authority: CN
Inventors: 宁志芳; 江明波; 符瑜凡; 马瑞
Original assignee: Hefei Midea Rongshida Refrigerator Co Ltd
Current assignee: Hefei Midea Refrigerator Co Ltd
Priority date: 2009-03-23
Filing date: 2009-03-23
Publication date: 2010-10-13
Anticipated expiration: 2029-03-23
Also published as: CN101509718A

Abstract

The invention provides an automatic defrosting system for an air-cooled refrigerator, which is characterized in that a compressor, a condenser, a capillary, an evaporator and an air returning pipe are sequentially connected so as to assemble a refrigerant circulation system; furthermore, the inlet of the condenser and the inlet of the evaporator are spanned and connected by a defrosting branch which is provided with an electromagnetic valve in series; the electromagnetic valve is provided with two controllable working states: opening state and closing state; and the opening of the electromagnetic valve is used as the working state of the defrosting operation of the system. The automatic defrosting system can defrost thoroughly, the temperature in the box has no high increment and the energy consumption for the defrosting is low.

Description

Air cooling refrigerator automatic defrosting system

Technical field

The present invention relates to the refrigerator defrosting system, the air cooling refrigerator automatic defrosting system of more specifically saying so.

Background technology

Air-cooled refrigerator in the prior art all is to adopt the mode that heating tube is set to carry out defrost, promptly is accompanied by evaporimeter electric heater is set, and heats up in the periphery with electric heater, thereby makes the evaporimeter defrost.This is a kind of mode of heating of ecto-entad, and this mode exists following problem obviously:

1, use electrothermal device to exist the potential safety hazard of fire unavoidably;

2, the mode of heating of ecto-entad often exists the halfway problem of defrost, and defrost process need all melt frost completely, time consumption and energy consumption.

3, the heat of heating generation can not directly be drawn by frost, and quite a few heat input is in a chamber, and this not only makes the room temperature degree that bigger rise is arranged, and more brings complete machine defrost energy consumption height, use cost height.

Summary of the invention

The present invention is for avoiding above-mentioned existing in prior technology weak point, provide a kind of do not exist potential safety hazard, defrost thoroughly, the temperature inside the box do not have higher rise, air cooling refrigerator automatic defrosting system that the defrost energy consumption is low.

Technical solution problem of the present invention adopts following technical scheme:

The version of air cooling refrigerator automatic defrosting system of the present invention is to connect and compose refrigerant-cycle systems in turn with compressor, condenser, capillary, evaporimeter and muffler;

Design feature of the present invention is a cross-over connection defrost branch road between the inlet of the inlet of condenser and evaporimeter, series connection is provided with magnetic valve in the defrost branch road, magnetic valve has two slaved operations of opening and closing, and is system's defrost duty with the unlatching of magnetic valve.

Compared with the prior art, beneficial effect of the present invention is embodied in:

1, the present invention directly imports evaporimeter with high temperature refrigerant, and the evaporimeter self-temperature is raise, and defrost process has been utilized to very high degree heat from inside to outside, reduces thermal loss, reduces the influence to the temperature inside the box, shortens the defrost time greatly, reduces energy consumption.

2, the present invention is owing to adopt from inside to outside mode of heating, and not only the defrost of evaporimeter appearance is thorough, and, may appear at the evaporimeter appearance be heated reach to a certain degree after, frosting comes off voluntarily, and defrost process is more taken a shortcut.

3, the present invention avoids using electric heating tube, has eliminated potential safety hazard.

Description of drawings

Fig. 1 is a system architecture schematic diagram of the present invention.

Fig. 2 is the working state of system schematic diagram of the non-defrost of the present invention.

Fig. 3 is the working state of system schematic diagram of defrost of the present invention.

Fig. 4 is a control circuit schematic diagram of the present invention.

Number in the figure: 1 compressor, 2 condensers, 3 capillaries, 4 evaporimeters, 5 mufflers, 6 defrost branch roads, 7 magnetic valves, 8 dew eliminating tubes, 9 devices for drying and filtering.

Below by the specific embodiment, the invention will be further described in conjunction with the accompanying drawings.

The specific embodiment

Referring to Fig. 1, present embodiment is the refrigeration system based on routine, promptly as shown in Figure 1 connect and compose refrigerant-cycle systems in turn with compressor 1, condenser 2, capillary 3, evaporimeter 4 and muffler 5, also comprise requiring the dew eliminating tube 8 and the device for drying and filtering 9 that in system, are provided with routinely;

As shown in Figure 1, in the present embodiment, cross-over connection has defrost branch road 6 between the inlet of the inlet of condenser 2 and evaporimeter 4, and series connection is provided with magnetic valve 7 in defrost branch road 6, and magnetic valve 7 has two slaved operations of opening and closing.

Figure 2 shows that magnetic valve 7 is under the closed condition, system connects and composes refrigerant-cycle systems in turn by compressor 1, condenser 2, capillary 3, evaporimeter 4 and muffler 5, satisfies the needs of refrigerator refrigerating function;

Figure 3 shows that magnetic valve 7 is under the opening, capillary 3 itself opens circuit because of resistance presents greatly at this moment, is connected in turn by compressor 1, magnetic valve 7, defrost branch road 6, evaporimeter 4 and muffler 5, and system enters the defrost duty, finishes the defrost function.

When magnetic valve 7 was opened, the gas that ejects from compressor 1 was the gas of HTHP, and high-temperature gas flows along the pipeline of evaporimeter 4, and the temperature of whole evaporimeter 4 can reach above zero soon, thereby reaches the purpose of defrost.

Referring to Fig. 4, the control circuit in the present embodiment adopts magnetic valve timing controlled principle

Control procedure: when refrigerator normally powers on, this moment, duty was that lamp switch Kd connects, the loop conducting of illuminating lamp L place, simultaneously, and the loop conducting of compressor YSJ place, fan electromotor MF loop conducting, just 3 pin of timer and 4 pin are connected.

When the timesharing in 8 hours 46 of working of refrigerator accumulative total, 3 pin of timer TM and 2 are connected, and magnetic valve DCF is because of must electric commutation conducting, and compressor YSJ keeps operate as normal, and fan electromotor MF quits work, and system enters defrost state.

When the temperature of thermostat K reached 8 ℃, thermostat K disconnected, this moment timer TM duty be 3 pin through of the road conducting of 2 pin through 1 pin to 4 pin, timer TM picks up counting.This section is defrost recovery time, is used to remove on the evaporimeter and the interior redundant moisture of drip tray, and anti-stagnant ice is stifled.

Work 2 minutes 24 seconds the time when timer TM accumulative total, system withdraws from defrost state fully, and timer 3 pin and 4 pin reclose, and system is the normal operation input state again.

Claims

1. air cooling refrigerator automatic defrosting system is characterized in that connecting and composing refrigerant-cycle systems in turn with compressor (1), condenser (2), capillary (3), evaporimeter (4) and muffler (5); It is characterized in that cross-over connection defrost branch road (6) between the inlet of the inlet of described condenser (2) and described evaporimeter (4), series connection is provided with magnetic valve (7) in described defrost branch road (6), described magnetic valve (7) has two slaved operations of opening and closing, and is system's defrost duty with the unlatching of magnetic valve (7);

Control circuit adopts the magnetic valve timing controlled, described time-controlled control method is set is:

When refrigerator normally powers on, the loop conducting of compressor YSJ place, fan electromotor MF loop conducting, 3 pin of timer TM and 4 pin are connected;

When the timesharing in 8 hours 46 of working of refrigerator accumulative total, 3 pin of timer TM and 2 pin are connected, the magnetic valve DCF conducting that commutates, and compressor YSJ keeps operate as normal, and fan electromotor MF quits work, and system enters defrost state;

When the temperature of temperature controller K reached 8 ℃, temperature controller K disconnected, 3 pin of timer TM through 2 pin again through one tunnel conducting of 1 pin to 4 pin, timer TM picks up counting, system enters defrost recovery time, be used to remove on the evaporimeter and drip tray in redundant moisture, anti-stagnant ice is stifled;

Work 2 minutes 24 seconds the time when timer TM accumulative total, timer 3 pin and 4 pin reclose, and normal operating condition recovers in system.