CN1333224C

CN1333224C - Refrigerator

Info

Publication number: CN1333224C
Application number: CNB200510075841XA
Authority: CN
Inventors: 野口好文; 佐久间勉; 天明稔; 堀江宗弘
Original assignee: Toshiba Corp; Toshiba Consumer Marketing Corp; Toshiba Home Appliances Corp
Current assignee: Toshiba Corp; Toshiba Lifestyle Products and Services Corp
Priority date: 2004-05-28
Filing date: 2005-05-27
Publication date: 2007-08-22
Anticipated expiration: 2025-05-27
Also published as: JP2005337613A; KR20060048127A; TW200607967A; CN1702411A; KR100681958B1

Abstract

This invention provides a refrigerator for suppressing adverse effects of warm air on foods by uniforming temperature rise in a storage room during defrosting operation. A defrosting heater is energized until a temperature detected by a FD sensor gets to a defrosting ending temperature (8[deg.]C). During defrosting operation for defrosting a F evaporator, a F fan is kept stopped. When the FD sensor detects a temperature not lower than than a set temperature (2[deg.]C) set lower than the defrosting ending temperature (8[deg.]C), the F fan is reversed for a preset time (one minute).

Description

Refrigerator

Technical field

The present invention relates to be undertaken the refrigerator of Defrost operation by Defrost heater.

Background technology

In the past, cooling performance was descended, so, for example surpass 8 hours and just Defrost heater is switched on to carry out the Defrost operation of heating fumigators whenever the accumulated running time of compressor with cycle of regulation because the moisture in the storeroom is bonded on the evaporimeter as frost.Fig. 6 is the time diagram of the control method of the traditional Defrost operation of expression, in Defrost operation, carried out stopping the fan that cool-air feed is used in advance after time of tx, reach the defrosting end temp for example more than 10 ℃ the time at evaporimeter, regarding as in the moment of ty melts the frost of adhesion, cut-out finishes Defrost operation to the energising of Defrost heater.For the pressure balance in the kind of refrigeration cycle, compressor was brought into operation from the moment of tz.

This occasion, in order to shorten the required time of defrosting, can consider following control method, that is, make fan counter-rotating off and on by second half section, prevent the diffusion of heat in storeroom of Defrost heater at Defrost operation, and send evaporimeter back to, accelerate defrosting, the indoor temperature rising (for example, patent documentation 1: Japan Patent is opened flat 6-18884 communique in fact) of freezing-inhibiting simultaneously.

But because risen by the heating installation after the Defrost heater heating, so as shown in Figure 6, the upper temp of storeroom is than temperature of lower height.In this case, the upper space of storeroom high temperatureization in Defrost operation, even restart simultaneously the cooling operation, cool off also slow, lasting higher state of temperature, thereby food had harmful effect.Such problem especially in the low refrigerating chamber of design temperature, takes place when the height dimension of its storeroom is big easily.

In the structure of patent documentation 1, because fan is reversed off and on, thereby can shorten defrosting time, but the summation of rotational time is elongated, so heating installation is exceedingly blown to storeroom, the mean temperature in the storeroom has the danger of rising on the contrary.In addition, in general the time till finishing to defrosting is different because of the frosting degree of evaporimeter, but because of the counter-rotating of fan is carried out after having passed through stipulated time t, so exist the counter-rotating do not carry out fan or reversing time long and cause above-mentioned such worry that indoor temperature rises of storing.

Summary of the invention

The present invention considers the problems referred to above, and its purpose is, a kind of temperature rising homogenising that can make storeroom reliably when Defrost operation is provided, can suppresses the dysgenic refrigerator of heating installation to food.

In order to address the above problem, refrigerator of the present invention has: with the kind of refrigeration cycle of compressor, condenser, the connection of evaporimeter ring-type; To blow to the fan of storeroom by the cold air that described evaporimeter generates; Heat the Defrost heater of described evaporimeter; Detect the temperature sensor of described evaporimeter or near the temperature it, before the detected temperatures of described temperature sensor arrives the defrosting end temp, described Defrost heater is switched on to carry out the Defrost operation of described evaporimeter, it is characterized in that, described fan is stopped in Defrost operation, simultaneously, with the described fan counter-rotating stipulated time, this design temperature is configured to be lower than described defrosting end temp when described temperature sensor detects temperature more than the design temperature.

Adopt foregoing invention, in Defrost operation, suitably make the fan counter-rotating, the heating installation that is trapped in storeroom top can be recycled to vaporizer side, thus can make the temperature rising homogenising in the storeroom, thus suppress the harmful effect of heating installation to food.

Description of drawings

Fig. 1 is the time diagram of the Defrost operation of an expression example of the present invention.

Fig. 2 is the front view of the refrigerator of an expression example of the present invention.

Fig. 3 is the front view of state of the door of the expression refrigerator that omitted Fig. 2.

Fig. 4 is the cutaway view of expression along the A-A line of the refrigerator of Fig. 2.

Fig. 5 is the synoptic diagram of the kind of refrigeration cycle of an expression example of the present invention.

Fig. 6 is the time diagram of the traditional Defrost operation of expression.

The specific embodiment

Below, with reference to accompanying drawing an example of the present invention is described.Fig. 2 is the front view of refrigerator of an expression example of the present invention, and Fig. 3 is the front view of state of the door of the expression refrigerator that omitted Fig. 2, Fig. 4 be the expression refrigerating chamber, along the cutaway view of the A-A line of the refrigerator of Fig. 2.

Refrigerator body 1 will keep in cold storage and set about chamber 10 and cold storage room 20 are divided into, two storerooms, cold air mobile separate.Be provided with Machine Room 31 in bottom, the back side of refrigerator body 1, be equipped with compressor 33, not shown radiator fan, condenser 34 etc.

In the chamber 10 that keeps in cold storage, be equipped with the 1st refrigerating chamber 11 from top to bottom successively, have ice-making compartment the 12, the 2nd refrigerating chamber 14 of automatic ice-making plant 13, be provided with rotary door 11a, 12a, the 14a that switching is closed freely at each peristome.The evaporimeter 15 (hereinafter referred to as the F evaporimeter) that the chamber of keeping in cold storage is used is provided in the back side of the 2nd refrigerating chamber 14, the fan 16 (hereinafter referred to as the F fan) that the chamber of keeping in cold storage is used is provided in the top of F evaporimeter 15, the pipeline 17 of the cold air that is generated by this F evaporimeter 15 by being located at the back side is drawn to the top by the rotation of F fan 16, supplies with from a plurality of blowing mouths 18 that are formed at each storeroom.Cooled cold air is carried out in each chamber suck F evaporimeters 15 sides, carry out blowing out to each chamber after the heat exchange with F evaporimeter 15 once more from the air entry 19 of the lower backside that is formed at the 2nd refrigerating chamber 14.

The temperature sensor 53 (hereinafter referred to as the F sensor) that detects the storage indoor temperature is installed at the back side of the 1st refrigerating chamber 11, controls compressor 33 and F fan 16 etc. according to the detected temperatures of this F sensor 53, the chamber 10 that will keep in cold storage is cooled to design temperature.

As shown in Figure 4, Defrost heater 40 is installed in F evaporimeter 15, defrosts by energising heating F evaporimeter 15.This Defrost heater for example by utilizing photothermal Glass tube heater or the main tube heater that conducts heat that utilizes to constitute, adopts tube heater in this example.

In cold storage room 20, be equipped with Unscrew formula refrigerating chamber 21, pull-out type vegetable compartment 22 and Bottle ﹠ Can chamber 23 from top to bottom successively, be provided with door 21a, 22a, the 23a that switching is closed freely at each peristome.The back side in Bottle ﹠ Can chamber 23, the fan 25 (hereinafter referred to as the R fan) that evaporimeter 24 (hereinafter referred to as the R evaporimeter) that cold storage room is used and cold storage room are used sets in tandem, the pipeline 26 of the cold air that is generated by this R evaporimeter 24 by being located at the back side is drawn to the top by the rotation of R fan 25, supplies with to indoor from a plurality of blowing mouths 27 that are formed at refrigerating chamber 21.Refrigerating chamber 21 is carried out cooled cold airflow cross vegetable compartment 22 and Bottle ﹠ Can chamber 23 and suck R evaporimeters 24 sides, carry out blowing out to each chamber after the heat exchange with R evaporimeter 24 once more from the air entry 28 at the back side that is formed at Bottle ﹠ Can chamber 23.

The temperature sensor 54 (hereinafter referred to as the R sensor) that detects the storage indoor temperature is installed at the back side of refrigerating chamber 21, compressor 33 and R fan 25 is rotated control, cold storage room 20 is cooled to design temperature according to the detected temperatures of this R sensor 54.

Shown in Figure 5 as synoptic diagram, kind of refrigeration cycle 32 of the present invention is connected with condenser 34 in turn and as the triple valve 35 of flow passage selector device in the discharge side of compressor 33, side at the outlet side of triple valve 35 is connected with pipe arrangement, this pipe arrangement is connected with gas receiver 37 with F evaporimeter 15 with capillary 36 freezing successively, and the opposing party of the outlet side of triple valve 35 is connected with pipe arrangement, and this pipe arrangement is connected the 2nd capillary 38 with R evaporimeter 24.The outlet side pipe arrangement of R evaporimeter 24 is connected with the inlet side of F evaporimeter 15, and the outlet side pipe arrangement of gas receiver 37 is connected with the suction side of compressor 33.

Freezing with defrosting sensor 51 (hereinafter referred to as the FD sensor) that outlet side pipe arrangement temperature to F evaporimeter 15 detects is installed in gas receiver 37, refrigeration that the pipe arrangement temperature to R evaporimeter 24 detects is installed with defrosting sensor 52 (hereinafter referred to as the RD sensor) at the outlet pipe arrangement of R evaporimeter 24.

Below common cooling operation is described.When the detected temperatures of F sensor 53 be the ON temperature, for example for more than-18 ℃ the time, operation triple valve 35 makes refrigerant flow direction F evaporimeter 15 sides, with the cooling chamber 10 (hereinafter referred to as the F refrigerating mode) that keeps in cold storage.On the other hand, be the ON temperature, for example be more than 5 ℃ the time that operation triple valve 35 makes refrigerant flow direction R evaporimeter 24 sides, with cooling refrigeration storeroom 20 (hereinafter referred to as the R refrigerating mode) when the detected temperatures of R sensor 54.In this R refrigerating mode, rotation R fan 25 stops F fan 16 in advance to cold storage room 20 cool-air feeds.In the F refrigerating mode, rotation F fan 16 is to chamber 10 cool-air feeds that keep in cold storage, and R fan 25 is for the defrosting of R evaporimeter 24, and the detected temperatures that rotates to RD sensor 52 in advance rises to the temperature of regulation, for example 3 ℃.

This occasion, in the F refrigerating mode when the detected temperatures of F sensor 53 be the OFF temperature, for example-20 ℃ below the time, change the R refrigerating mode over to, the detected temperatures when R sensor 54 in the R refrigerating mode is the OFF temperature, for example below 1 ℃ the time, change the F refrigerating mode over to.In addition, even without arriving the OFF temperature, when cool time of a side when being long-time, there is the not enough worry of cooling in the opposing party, so every stipulated time switches successively.By these structures, keep in cold storage chamber 10 and cold storage room 20 alternately cool off, and remain on each design temperature fifty-fifty.

Then, describe with reference to the time diagram of Fig. 1 Defrost operation F evaporimeter 15 of the present invention.Also having represented to be positioned at keep in cold storage the detected temperatures of temperature, the temperature of the 2nd refrigerating chamber that is positioned at the bottom and FD sensor 51 of the 1st refrigerating chamber on top of chamber 10 with time diagram in Fig. 1 changes.

As shown in Figure 1, the cooling operation from common stops compressor 33 constantly at ta, to Defrost heater 40 energisings, changes the Defrost operation of heating F evaporimeter 15 over to.This Defrost operation carried out with the cycle of regulation, and in this example, the operation accumulated time of compressor 33 shifted in the moment that the F refrigerating mode finishes through 8 hours.In addition, before Defrost operation,, the end setup temperature of F refrigerating mode is descended by stages, force to cool off the pre-cold operation of chamber 10 grades of keeping in cold storage for the heating that suppresses because of Defrost heater 40 causes that the temperature in the storeroom rises.

By the heating of Defrost heater 40, the detected temperatures of FD sensor 51 rises gradually, when reach the 1st design temperature, when being 2 ℃ here, at tb constantly with the 16 counter-rotating stipulated times of F fan, be 1 minute here, the tc after having passed through this 1 minute stops constantly.

This be because, carry out heat exchange by the heating of Defrost heater 40 with F evaporimeter 15, the air after temperature rises rises in pipeline 17, the top of chamber 10 that keeps in cold storage, is that the storage indoor temperature of the 1st refrigerating chamber 11 is gradually than the 2nd refrigerating chamber 14 height here.Therefore, the air of the 1st refrigerating chamber 11 is recycled to F evaporimeter 15 sides, prevents the cause that the 1st refrigerating chamber 11 temperature only rise.

This occasion, the 1st design temperature are in order to make up and down storeroom space temperature evenly for purpose, through experiment, preferably with the specific temperature rise of the 1st refrigerating chamber 11 as the temperature of comparing with the 2nd refrigerating chamber 14 when increasing gradually.In addition, long when the rotational time of counter-rotating, then the heating installation air-supply is to the 2nd refrigerating chamber 12, and temperature significantly rises, so preferably be set at for example 10 seconds～2 minutes short time.

The detected temperatures of FD sensor 51 rises, be set at 2nd design temperature higher when reaching than the 1st design temperature, when being 4 ℃ here, at td constantly with the 16 counter-rotating stipulated times of F fan, be 1 minute here, at the te that has passed through the stipulated time F fan 15 is stopped.Equally, be set at 3rd design temperature higher when reaching, when being 6 ℃ here than the 2nd design temperature, at tf constantly with the 16 counter-rotating stipulated times of F fan, be 1 minute here, at tg F fan 15 is stopped.

The reason that a plurality of design temperatures that raise stage by stage so are set is, by experiment, even after with 16 counter-rotatings of F fan, up and down in the form of the refrigerator that increases gradually of the temperature difference in storeroom space, reclaimed by heating installation once more, can be made the equalizing temperature of storage space up and down reliably the 1st refrigerating chamber 11.

In addition, owing to F fan 16 is reversed corresponding to the rising of the detected temperatures of FD sensor 51,, can prevent that thus the 2nd refrigerating chamber 14 from rising because of unwanted rotation causes temperature so when storage space produces the temperature difference up and down, can reclaim heating installation reliably.

In the moment of th, the detected temperatures of FD sensor 51 is as reaching the defrosting end temp, being more than 8 ℃ the time here, regarding that defrosting is finished as or thus after waste heat finish defrosting, cut off energising to Defrost heater 40, finish Defrost operation.This occasion, compressor 33 be for the pressure balance of kind of refrigeration cycle 32 etc., for example compressor 33 stopped before 6 minutes through the stipulated time.At the ti that has passed through the stipulated time constantly, the operation of beginning compressor 33 makes the operation of F fan 16 positive rotation simultaneously, changes common cooling operation over to.

As mentioned above, according to the present invention, in Defrost operation, stop F fan 16 in advance, detect when setting for when FD sensor 51 simultaneously than the temperature more than the low design temperature of defrosting end temp, make 16 counter-rotatings of F fan at the appointed time, so compare with the storage space 14 of bottom, make 16 counter-rotatings of F fan when the temperature of the storage space 11 on top rises or before rising reliably, the heating installation that is trapped in storeroom top can be recycled to F evaporimeter 15 sides, so can make the temperature rising homogenising of the 1st refrigerating chamber 11 and the 2nd refrigerating chamber 14 of the chamber 10 that keeps in cold storage, thereby can suppress the harmful effect of heating installation to food.

In addition, the heated air on the 1st refrigerating chamber 11 tops is by the counter steer F evaporimeter 15 sides air-supply of F fan 16, but as continue rotation, the then Quilt with air conditioning of the 1st refrigerating chamber 11 bottoms air-supply was so stopped sometimes after the detected temperatures of FD sensor 51 is once rising or descended.This occasion, be taken as the detected temperatures of FD sensor 51 as end benchmark with the counter-rotating of F fan 16, then because of above-mentioned reason, the detected temperatures instability of FD sensor 51, so might rotational time extremely shorten or elongated, but among the present invention, the end benchmark of counter-rotating is taken as by the definite setting-up time of experiment, thereby can reclaim heating installation reliably, can prevent from simultaneously to rise because of unwanted rotation causes the 2nd refrigerating chamber 14 significant temperature.

And, according to the present invention, a plurality of design temperatures that raise stage by stage are set, when temperature sensor detects each temperature more than design temperature, owing to,, can make the temperature rising homogenising of the chamber 10 that keeps in cold storage reliably so pass through the high room air of recovered temperature aptly with the 16 counter-rotating stipulated times of F fan, discontinuous rotation simultaneously, thereby can further prevent to rise because of unwanted rotation causes the 2nd refrigerating chamber 14 significant temperature.

Variation to this example describes below.In this example, it is high more to make design temperature, and the stipulated time of the counter-rotating of fan is short more.Design temperature is high more, and the upper temp of storeroom raises, so even identical rotational time is big to the influence of the temperature rising of the 2nd refrigerating chamber 14.Therefore, design temperature is high more, and the stipulated time of the counter-rotating of fan is short more, for example, be 1 minute when making the 1st design temperature, be 40 seconds during the 2nd design temperature, be 20 seconds during the 3rd design temperature, just can suppress the intrusion of the room air of higher temperature, the temperature that can suppress the 2nd refrigerating chamber 14 rises.On the other hand,,, can reclaim the heating installation of the 1st refrigerating chamber 15 reliably, make the temperature in storeroom space up and down even through counter-rotating repeatedly even shorten the reversing time of F fan 16.

In addition, when the detected temperatures of FD sensor 51 reaches the defrosting end temp, as long as stop the counter-rotating of F fan 16.When FD sensor 51 detected the defrosting end temp, defrosting was finished, and just there is no need to make the fan rotation, this occasion is even in official hour, by stopping the counter-rotating of F fan 16, can prevent unwanted rotation, the temperature that can suppress the 2nd refrigerating chamber 14 rises.

And, be that it is effective that the heating installation that fan counter-rotating of the present invention is carried out reclaims under the situation of the heater by conducting heat heating fumigators when Defrost heater 40.Risen by the heating installation after the Defrost heater heating, but utilize photothermal Defrost heater generally to be provided in the bottom of evaporimeter, radiating fin or pipe become wall, so be difficult for rising on the top of evaporimeter.But the Defrost heater that utilizations such as tube heater are conducted heat generally is pressed on the periphery of evaporimeter, so area of dissipation is big, especially dispels the heat to top from the part that is provided in the top.Therefore, heated heating installation rises on the top of storeroom easily, and the upper temp of storeroom is than the remarkable rising in bottom.

That is, when Defrost heater was the heater that utilize to conduct heat, the upper space of storeroom high temperatureization in Defrost operation even restart the cooling operation simultaneously, cool off also slowly, and the lasting higher state of temperature is so heating installation has harmful effect to food.Therefore, Defrost heater is when utilizing the heater that conducts heat, and fan counter-rotating of the present invention is effective to the recovery of heating installation.

And, in the Umklapp process of F fan 16, can cut off energising in advance to Defrost heater 40.Counter-rotating by F fan 16, blown out to the 2nd refrigerating chamber 14 from suction inlet 19 by the heating installation after Defrost heater 40 heating, but by in this counter-rotating, cutting off energising, the air themperature that blows to the 2nd refrigerating chamber 14 is descended, and then can suppress the temperature rising of the 2nd refrigerating chamber Defrost heater 40.In addition, even cut off energising, because the heating installation that is trapped in storeroom top is reclaimed and blows to F evaporimeter 16, so also can promote to defrost to Defrost heater 40.

In addition, said structure is an example of the present invention, can carry out various changes.In this example, the method for utilizing the rotation of R fan 25 to defrost to R evaporimeter 24 is illustrated, but R evaporimeter 24 also can equally with F evaporimeter 15 carry out Defrost operation by Defrost heater 40, also can carry out fan control of the present invention.In addition, kind of refrigeration cycle 32 is not limited to the illustrated structure of this example, and also R evaporimeter 24 circulates side by side with F evaporimeter 15 what is called that are connected arranged side by side or utilized the kind of refrigeration cycle of double-stage compressor or utilized single evaporator circulation that single evaporimeter cools off refrigerating chamber 20 and refrigerating chamber 10 etc.And, the moment of defrosting beginning, the best forms according to refrigerator such as cycle of defrost end temp, design temperature, stipulated time, regulation are suitably changed.

[possibility of utilizing on the industry]

The present invention is applicable to the various refrigerators with the Defrost operation that utilizes Defrost heater.

Claims

1. a refrigerator has: with the kind of refrigeration cycle of compressor, condenser, the connection of evaporimeter ring-type; To blow to the fan of storeroom by the cold air that described evaporimeter generates; Heat the Defrost heater of described evaporimeter; Detect the temperature sensor of described evaporimeter or near the temperature it,

Before the detected temperatures of described temperature sensor arrives the defrosting end temp, described Defrost heater energising to carry out the Defrost operation of described evaporimeter, be is characterized in that,

Described fan is stopped in Defrost operation, and simultaneously, with the described fan counter-rotating stipulated time, this design temperature is configured to be lower than described defrosting end temp when described temperature sensor detects temperature more than the design temperature.

2. refrigerator as claimed in claim 1 is characterized in that, a plurality of design temperatures that raise stage by stage are set, and when temperature sensor detects each temperature more than design temperature, fan is reversed the stipulated time.

3. refrigerator as claimed in claim 2 is characterized in that design temperature is high more, makes the stipulated time short more.

4. refrigerator as claimed in claim 1 is characterized in that, the detected temperatures of temperature sensor stops the counter-rotating of fan after reaching the defrosting end temp.

5. refrigerator as claimed in claim 1 is characterized in that, Defrost heater is to utilize the heater that conducts heat heating fumigators.

6. refrigerator as claimed in claim 1 is characterized in that, in the Umklapp process of fan, cuts off the energising of Defrost heater in advance.