CN205425590U - White refrigerating system of multicycle forced air cooling refrigeratorization - Google Patents

Abstract

The utility model discloses a white refrigerating system of multicycle forced air cooling refrigeratorization, including the compressor, the compressor is connected with first solenoid valve, and the white condenser of first exit linkage of the having and its second exit linkage of first solenoid valve have the main condenser, change the export of white condenser and all be connected the second solenoid valve with the main condenser export, second solenoid valve first export in proper order the series connection have first capillary and freezing evaporimeter and its second to export in proper order the series connection has second capillary and cold -stored evaporimeter, cold -stored evaporimeter export exports with freezing evaporimeter all is connected compressor inlet, it follows to change white condenser the total length and the freezing evaporimeter of freezing evaporimeter are laminated mutually, and freezing evaporimeter department is equipped with electric heater unit, the utility model discloses a condenserization frost and electrical heating frost combine together changes white mode, changes the frost and does not keep the dead angle, has ensured the completeness of changing the frost, improves the heat exchange efficiency of freezing evaporimeter, the additional energy consumption of reduction refrigerator.

Description

Multi cycle wind cooling refrigerator defrosting refrigeration system

Technical field

This utility model relates to refrigeration technology field, particularly relates to the defrost refrigeration structure of wind cooling refrigerator.

Background technology

In refrigerator industry, wind cooling refrigerator is fast by refrigerating speed, the temperature inside the box is uniform, advantage without artificial defrosting, gradually favored by increasing consumer, also become the main product that each large refrigerator manufacturer carries out researching and developing energetically, and the wind cooling refrigerator of the big volume of multi cycle is because having independent loops refrigeration, the advantage of the fresh-keeping not taint of odour of subregion, the most day by day increases in the share shared by high-end refrigerator market.

The operation principle of wind cooling refrigerator is to utilize air to freeze, when extraneous high temperature air flows through the vaporizer being arranged at refrigerator inside, owing to air themperature is high, the temperature of vaporizer is low, and air and vaporizer directly carry out heat exchange, and after heat exchange, the temperature of air reduces.The cold air that temperature reduces after heat exchange is blown in refrigerator, freezes refrigerator inside, and wind cooling refrigerator is through said process and is constantly circulated and freezes refrigerator inside, thus reduces internal temperature of refrigerator.But, air is permanently present steam, steam meets cold will condensation, as long as so the heat exchange carried out in refrigerator between air and vaporizer, just having frost formation.Therefore with the presence of frost in wind cooling refrigerator, but the frost in refrigerator does not condense in refrigerator inside yet, but has condensed on vaporizer.And the existence of frost layer will have influence on refrigeration performance, even block the circulation of air, it is therefore desirable to vaporizer is carried out defrost.

Generally according to evaporimeter frosting situation in prior art, automatically turning on defrosting system and vaporizer is carried out defrost, to ensure vaporizer heat exchanger effectiveness, the main mode using thermal evaporation is removed.General refrigerator time-out refrigeration after refrigerator work a period of time, starts defrosting heating system simultaneously and heats vaporizer.Condensing and become water after frost on an evaporator is heated, frost water is discharged by special conduit.As Chinese patent 201210474485.9 relate to a kind of defrosting system of refrigerator, including being placed in the vaporizer of evaporator of refrigerator intracavity, it is arranged on the defrosting heater of evaporator of refrigerator intracavity, controls defrosting heater energising work or the control loop of power-off；Being provided with drip tray in the lower section of vaporizer, defrosting heater includes that upper strata adds heat pipe and lower floor adds heat pipe, and upper strata adds heat pipe near vaporizer, and lower floor adds heat pipe then near drip tray, is respectively heated by double-layer heating pipe during defrost；Such as Chinese patent 201410383146.9, provide the control method of a kind of wind cooling refrigerator defrosting system, set the first temperature threshold Ta and the second temperature threshold Tb, after suspending refrigeration, first defrost heating element heater heats with power W1, heating with power W2 when the detection temperature of defrost temperature-sensing probe is more than Ta, when the detection temperature of defrost temperature-sensing probe is more than Tb, defrost terminates；Such as Chinese patent 201410608639.8, disclose a kind of wind cooling refrigerator defrosting system and control method, wind cooling refrigerator, including freezer evaporator, freezer evaporator is provided with refrigerating chamber defrost assembly, refrigerating chamber defrost assembly includes the first defrost parts being respectively arranged on freezer evaporator bottom part down and the second defrost parts being located on freezer evaporator sidewall, when defrost starts, the two defrost parts bottom and sidewall to vaporizer respectively is heated.

But above-mentioned method has following deficiency:

Frost layer on vaporizer is removed by the form the most too much depending on electrical heating elements heating, this additional energy consumption has also accounted for the 5% of the total power consumption of refrigerator, when refrigerator running occurs the blocked up situation of frost layer, proportion shared by this additional energy consumption will be bigger, and multi cycle big volume wind cooling refrigerator is owing to having higher requirement to the volume of vaporizer, work efficiency with refrigeration, result also in evaporator surface and can condense more frost, this additional energy consumption also leading to occur in multi cycle big volume wind cooling refrigerator is even more serious." energy-saving and emission-reduction " the 12 " planning " that State Council in 2015 prints and distributes also explicitly points out, strengthen the promotion efficiency of energy-efficient product, including the requirement promoting domestic energy-conserving electrical equipment at civil area emphasis, therefore, how to reduce the additional energy consumption of electrical heating defrost, make refrigerator more energy efficient, have more market competitiveness, also become a problem demanding prompt solution.

2., due to the limitation of electrical heating elements position Yu mode, there will be the frosting dead angle that the electrical heating elements of certain area does not covers on an evaporator, there will be after defrost terminates defrost the most thoroughly, phenomenon that locally frost layer is not melted；This also leads to, and locally frost layer is blocked up causes evaporator heat exchange efficiency to decline, thus indirectly adds the power consumption in process of refrigerastion.

Because China is vast in territory, bigger across longitude and latitude, climate characteristic is complicated and changeable, most of areas make a clear distinction between the four seasons, when weather turns cold, when indoor temperature is less than the design temperature of cold room, the working time in the refrigeration loop of refrigerator will greatly shorten, even quit work, owing to the refrigerating chamber (refrigerating chamber) of now refrigerator is still in duty, the surface of refrigerating evaporator still has frost layer and condenses, thus there will be defrost not thoroughly or cannot the situation of defrost, and then the heat exchange efficiency of refrigerating evaporator can be reduced, increase energy consumption, refrigerator will be caused to work time serious.

Summary of the invention

The purpose of this utility model is the multi cycle wind cooling refrigerator defrosting refrigeration system providing a kind of defrost the most thorough and the most energy-conservation.

For achieving the above object, multi cycle wind cooling refrigerator defrosting refrigeration system of the present utility model includes compressor and electric control gear, it is characterized in that: along the flow direction of cold-producing medium, the gas outlet of compressor is connected by refrigerant tubing the first electromagnetic valve, first electromagnetic valve has two outlets, first outlet of the first electromagnetic valve is connected by refrigerant tubing defrost condenser, and the second outlet of the first electromagnetic valve is connected by refrigerant tubing main condenser；The refrigerant tubing that the refrigerant tubing that defrost condensator outlet is connected is connected with main condenser outlet connects the second electromagnetic valve after converging；Second electromagnetic valve has two outlets, the first capillary tube and refrigerating evaporator have been sequentially connected in series it on the refrigerant tubing that first outlet of the second electromagnetic valve is connected, being sequentially connected in series the second capillary tube and refrigeration evaporator on the refrigerant tubing that second outlet of the second electromagnetic valve is connected, the refrigerant tubing that the refrigerant tubing that refrigeration evaporator outlet is connected is connected with refrigerating evaporator outlet connects the air inlet of described compressor after converging；Described defrost condenser fits along the total length of described refrigerating evaporator with refrigerating evaporator, is provided with electric heater unit at described refrigerating evaporator；Described compressor, the first electromagnetic valve and the second electromagnetic valve all control to be connected with described electric control gear.

It is connected in series with dew eliminating tube on refrigerant line between described compressor and described first electromagnetic valve；Refrigerant tubing before described second electromagnetic valve entrance is provided with device for drying and filtering.

This utility model uses the defrost pattern that condenser defrost and electrical heating defrost combine, and bypass condenser to fit along refrigerating evaporator total length with refrigerating evaporator, dead angle is not stayed in defrost, dual defrost (condenser and electrical heating) has ensured the completeness of defrost and comprehensive, thus improve the heat exchange efficiency of refrigerating evaporator, reduce the additional energy consumption of refrigerator.Before electrical heating is opened, utilizing defrost condenser to carry out three pre-defrosts, compare the mode only with electrical heating defrost, the most energy-conservation.These can reduce the overall energy consumption of refrigerator, makes refrigerator more efficient energy-saving, meets industrial development direction, has the higher market competitiveness.

Control method in this utility model is the finest, make defrost condenser defrost together with electrical heating defrost not simple superposition, give full play to defrost condenser and compare the advantage that electrical heating defrost is the most energy-conservation, also played the advantage that electrical heating defrost is more reliable and more stable simultaneously, two kinds of defrost modes are complementary to one another, reach the most energy-conservation defrost, ensure again the reliable purpose of defrost.

In second sub-step of second step, re-execute this sub-step when refrigeration evaporator is not in duty before, wait that the N second re-executes this sub-step again, both can avoid refrigeration evaporator excessively the most frequent in the judgement being in duty cold state, the 3rd sub-step of second step can have been timely entered again after refrigeration evaporator starts working refrigeration.By intermediate parameters K, defrost condenser can either be utilized to carry out pre-defrost in the way of comparing electric heating energy-saving, again it can be avoided that perform too much pre-defrost number of times before opening electrical heating.

Control method of the present utility model, can make the pre-defrost time meet the operating mode that refrigerator runs the most, adapts to start-stop ratio, the absolute humidity of air and the practical situation of ambient temperature in this defrost cycle during refrigerator runs, determines the optimal pre-defrost time.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model；

Fig. 2 is the structural representation that defrost condenser is arranged together with refrigerating evaporator；

Fig. 3 is the left view of Fig. 2.

Fig. 4 is the schematic flow sheet of control method of the present utility model.

Detailed description of the invention

Term illustrates:

The shutdown temperature point of compressor when " shutoff temperature " refers to properly functioning in the art is typically low 1 ~ 2 degree than design temperature.Design temperature refers to the temperature value that refrigerator user sets, lower same.

Available machine time/(downtime of the available machine time of compressor+compressor) of " start-stop ratio "=compressor.

Such as Fig. 1, shown in Fig. 2 and Fig. 3, multi cycle wind cooling refrigerator defrosting refrigeration system of the present utility model includes that (electric control gear is this area routine techniques for compressor 1 and electric control gear, PLC or integrated circuit or single-chip microcomputer can be used, not shown electric control gear), the flow direction along cold-producing medium, the gas outlet of compressor 1 is connected by refrigerant tubing the first electromagnetic valve 2, first electromagnetic valve 2 has two outlets, first outlet 3 of the first electromagnetic valve 2 is connected by refrigerant tubing defrost condenser 6, second outlet 4 of the first electromagnetic valve 2 is connected by refrigerant tubing main condenser 5；The refrigerant tubing that the refrigerant tubing that defrost condenser 6 outlet is connected is connected with main condenser 5 outlet connects the second electromagnetic valve 7 after converging；Second electromagnetic valve 7 has two outlets, the first capillary tube 9 and refrigerating evaporator 10 have been sequentially connected in series it on the refrigerant tubing that first outlet 8 of the second electromagnetic valve 7 is connected, being sequentially connected in series the second capillary tube 12 and refrigeration evaporator 13 on the refrigerant tubing that second outlet 11 of the second electromagnetic valve 7 is connected, the refrigerant tubing that the refrigerant tubing that refrigeration evaporator 13 outlet is connected is connected with refrigerating evaporator 10 outlet connects the air inlet of described compressor 1 after converging；Described defrost condenser 6 fits along the total length of described refrigerating evaporator 10 with refrigerating evaporator 10, electric heater unit (using electric heater unit that refrigerating evaporator 10 is carried out defrost is technology commonly used in the art, not shown electric heater unit) it is provided with at described refrigerating evaporator 10；Described compressor the 1, first electromagnetic valve 2 and the second electromagnetic valve 7 all control to be connected with described electric control gear.

It is connected in series with dew eliminating tube 14 on refrigerant line between described compressor 1 and described first electromagnetic valve 2；Refrigerant tubing before described second electromagnetic valve 7 entrance is provided with device for drying and filtering 15.

This utility model additionally provides the control method of above-mentioned multi cycle wind cooling refrigerator defrosting refrigeration system.

Described electric control gear is built-in with compressor operating timer, pre-defrost timer, preparatory stage timer and electrical heating timer；Within a defrost cycle, T1 represents that the compressor 1 that compressor operating timer adds up runs the time, T2 represents the time in pre-defrost timer accumulative pre-defrost stage, T3 represents the time of preparatory stage before the electrical heating defrost that preparatory stage timer is accumulative, T4 represents the time in electrical heating timer accumulative electrical heating defrost stage, is preset with the TV university value of T4 in electric control gear；Tm is the compressor 1 accumulative time running a cycle that before refrigerator dispatches from the factory, electric control gear is preset；Tn is the pre-defrost time；Electric heater unit is built-in with electrical heating temperature sensor；H1 represents the temperature that the temperature sensor of electric heater unit is sensed；T1, T2, T3, T4, Tn and Tm all by minute in units of.

Described refrigeration system also includes cryogenic temperature sensor and the refrigerated storage temperature sensor being connected with electric control gear；F1 represents temperature value that cryogenic temperature sensor sensing arrives (unit for degree Celsius)；

Control method of the present utility model comprises the following steps successively:

First step, for entering defrost program step；Start working after the refrigeration system energising of refrigerator, compressor 1 starts, compressor operating timer continues timing (owing to when opening electrical heating in each defrost cycle, compressor operating timer is all cleared within a defrost cycle, therefore when the defrost cycle starts, compressor operating timer is timing of starting from scratch), electric control gear checks the value of the accumulated running time T1 of compressor 1, it is judged that whether T1 is less than Tm；If T1<Tm, then enter second step, if T1>=Tm, then enter third step；

Second step, before electrical heating defrost, the pre-defrost step that refrigerating evaporator 10 is carried out by defrost condenser 6, include following sub-step successively:

First sub-step, according to the timing of compressor operating timer, it is judged that T1 is location within a complete defrost cycle, to realize having enough pre-defrost number of times before opening electric heater heating；Electric control gear is preset with pre-defrost step condition one, pre-defrost step condition two and pre-defrost step condition three, (meets any one in pre-defrost step condition one, pre-defrost step condition two or pre-defrost step condition three, then enters the second sub-step；Pre-defrost step condition one, pre-defrost step condition two and pre-defrost step condition three then redirect and re-execute the action judging in first step whether T1 is less than Tm when being all unsatisfactory for)；

Pre-defrost step condition one is Tm/2 > T1 >=Tm/4, pre-defrost step condition two is 3Tm/4 > T1 >=Tm/2 and K=2, and pre-defrost step condition three is Tm > T1 >=3Tm/4 and K=3；First determining whether in this sub-step whether pre-defrost step condition one meets, as pre-defrost step condition one meets then assignment intermediate parameters K=1 enter the second sub-step, intermediate parameters K represents the number of times of pre-defrost in a defrost cycle；

As pre-defrost step condition one is unsatisfactory for, judge whether pre-defrost step condition two meets；The second sub-step is then entered as pre-defrost step condition two meets；As pre-defrost step condition two is unsatisfactory for, judge whether pre-defrost step condition three meets, then enter the second sub-step as pre-defrost step condition three meets, as pre-defrost step condition three is unsatisfactory for, re-execute the action judging in first step whether T1 is less than Tm；

Whether the second sub-step is to prepare waiting process before pre-defrost, first judge refrigeration evaporator 13 being in duty cold state, if in running order, then enter the 3rd sub-step；If being not in duty, then re-executing this sub-step (the second sub-step), entering the 3rd sub-step until refrigeration evaporator 13 is started working after refrigeration；

In 3rd sub-step, electric control gear performs three actions simultaneously:

1. electric control gear control the second electromagnetic valve 7 close its first export and open its second outlet；

Control the first electromagnetic valve 2 to close it and second export and open its first outlet the most simultaneously, thus utilize the condensation heat of defrost condenser 6 that the frost layer of refrigerating evaporator 10 is carried out pre-defrost heating；

3. electric control gear controls pre-defrost timer and starts timing, and pre-defrost timer continues timing within the most pre-defrost cycle；Defrost condenser 6 is had to set working time Tn in electric control gear；As pre-defrost time T2 >=Tn, electric control gear control the first electromagnetic valve 2 close its first export and open its second outlet, defrost condenser 6 quits work, and starts draining；As T2 >=2Tn, the value of intermediate parameters K is increased 1(and i.e. performs K=K+1), pre-defrost timer resets, and this pre-defrost terminates, and now re-executes the action judging in first step whether T1 is less than Tm；

Third step is electrical heating defrost step；Now compressor operating timer T1 stops and resetting, and this step includes following sub-step successively:

First sub-step is preparation process before electrical heating defrost；Electric control gear is built-in with electrical heating step condition one and electrical heating step condition two, and electrical heating step condition one is refrigerating chamber sensing temperature F1<shutoff temperature-2 DEG C, and electrical heating step condition two is T3>=70 minute；

In this sub-step, electric control gear controls preparatory stage timer and starts timing, and before entering the second sub-step of third step, preparatory stage timer continues timing；Electric control gear judges whether electrical heating step condition one meets, as met the second sub-step then entering third step, as being unsatisfactory for, judge whether electrical heating step condition two meets, as met the second sub-step then entering third step, as being unsatisfactory for, re-execute this sub-step；(until in these two electrical heating step conditions, at least one condition is met)；

In second sub-step of third step, the first action is that preparatory stage timer is reset by electric control gear, and the second action is to open electric heater unit to carry out defrost, and electrical heating timer starts timing；Subsequently into the 3rd sub-step；Before performing the 4th step, electric heater unit is continuously in open mode；

In 3rd sub-step of third step, the value of electric control gear detection H1 and T4, as H1 > 6 DEG C or T4 > default maximum time, enter the 4th step；When the maximum of H1≤6 and T4≤default, return to the second action performing in the second sub-step of third step；

4th step is defrost end step；In this step, electric control gear cuts out electric heater unit, makes electrical heating timer reset, intermediate parameters K is entered as zero, and epicycle electrical heating defrost terminates, and carries out draining.After compressor 1 brings into operation, compressor operating timer is started from scratch reclocking.

In above-mentioned second step the 3rd sub-step, pre-defrost time Tn determines as follows:

；

Wherein the span of a1, b1 and c1 is all more than or equal to 0 less than or equal to 1.

A1, b1 and c1 are that refrigerator is in the design phase, the fixed value determined by start-stop ratio, ambient temperature and the influence degree of ambient temperature according to the refrigerating chamber of specific model of refrigerator by designer, once it is determined that be constant after Hao, no longer change during the day-to-day operation of refrigerator.Refrigerating chamber such as certain model refrigerator is bigger, and refrigerating chamber foaming layer ratio is relatively thin, then ambient temperature will be bigger on the impact of refrigerating chamber and vaporizer thereof, then b1 value relatively will be bigger.This is owing to the relative thickness of refrigerating evaporator 10 frost layer increases along with start-stop ratio, the absolute humidity of air and the increase of ambient temperature in this defrost cycle, therefore to extend the defrost time accordingly, to adapt to concrete defrosting operating condition.Specifically, start-stop ratio is the biggest, and frost layer is the thickest；Air absolute humidity is the biggest, and frost layer is the thickest；Ambient temperature is the highest, and frost layer is the thickest, therefore according to above-mentioned formula, extends the pre-defrost time in the case of these three kinds, when situation is contrary, then reduces the pre-defrost time, so that the pre-defrost time more adapts to concrete defrosting operating condition.

In a word, the occurrence of a1, b1 and c1 these three parameter is that the concrete condition according to different model refrigerator determines, so that the influence degree of freezer compartment of refrigerator is matched by its occurrence with start-stop ratio, ambient temperature and environment absolute humidity in the process of experiment.Design phase, a1, b1 and c1 value principle is in the trail run of model machine, the start-stop in defrost cycle last time is bigger than the biggest (impact on refrigerating chamber and vaporizer thereof is the biggest) then a1, ambient temperature the highest (impact on refrigerating chamber and vaporizer thereof is the biggest) then b1 is the biggest, and ambient humidity the biggest (impact on refrigerating chamber and vaporizer thereof is the biggest) then c1 is the biggest.

In second sub-step of described second step, re-execute this sub-step when refrigeration evaporator 13 is not in duty before, wait that the N second re-executes this sub-step again；N is more than or equal to 2 seconds in equal to 10 seconds.The most both can avoid refrigeration evaporator 13 excessively the most frequent in the judgement being in duty cold state, the 3rd sub-step can have been timely entered after refrigeration evaporator 13 starts working refrigeration again.

Intermediate parameters K represents the number of times of pre-defrost in a defrost cycle, and its effect is: within a defrost cycle, after each pre-defrost, its value all increases by 1, and after performing three pre-defrost actions within a defrost cycle, K value is 4.So, even if re-executing when first step judges T1 whether action less than Tm T1 still less than Tm, it is then 4 due to K value, the most now three conditions in step are impossible to be met, and therefore avoid to perform 4 times or the situation of the most pre-defrost step within a defrost cycle.

Claims (2)

1. multi cycle wind cooling refrigerator defrosting refrigeration system, including compressor and electric control gear, it is characterized in that: along the flow direction of cold-producing medium, the gas outlet of compressor is connected by refrigerant tubing the first electromagnetic valve, first electromagnetic valve has two outlets, first outlet of the first electromagnetic valve is connected by refrigerant tubing defrost condenser, and the second outlet of the first electromagnetic valve is connected by refrigerant tubing main condenser；The refrigerant tubing that the refrigerant tubing that defrost condensator outlet is connected is connected with main condenser outlet connects the second electromagnetic valve after converging；Second electromagnetic valve has two outlets, the first capillary tube and refrigerating evaporator have been sequentially connected in series it on the refrigerant tubing that first outlet of the second electromagnetic valve is connected, being sequentially connected in series the second capillary tube and refrigeration evaporator on the refrigerant tubing that second outlet of the second electromagnetic valve is connected, the refrigerant tubing that the refrigerant tubing that refrigeration evaporator outlet is connected is connected with refrigerating evaporator outlet connects the air inlet of described compressor after converging；Described defrost condenser fits along the total length of described refrigerating evaporator with refrigerating evaporator, is provided with electric heater unit at described refrigerating evaporator；Described compressor, the first electromagnetic valve and the second electromagnetic valve all control to be connected with described electric control gear.

Multi cycle wind cooling refrigerator defrosting refrigeration system the most according to claim 1, it is characterised in that: it is connected in series with dew eliminating tube on the refrigerant line between described compressor and described first electromagnetic valve；Refrigerant tubing before described second electromagnetic valve entrance is provided with device for drying and filtering.