JPH08233428A - Refrigerator - Google Patents

Abstract

PURPOSE: To stably improve the preservation quality of a food which is preserved in a low temperature chamber, regarding a forced ventilation type refrigerator which is equipped with the low temperature chamber of which the temperature is independently controlled. CONSTITUTION: In first and second low temperature chambers 20, 21 with different temperatures, on the internal bottom surfaces of which a heat good conductor plate 33 is arranged, an air circulating passage 28 of which the route is different from a cold air-discharging passage 24 communicating with a damper device 23 is formed, and to which a second blower 27 for air circulation, being separately provided, is made to work. Also, the second blower 27 gradually reduces the operation ratio in response to the descent of the outside air temperature when a compressor 8 is stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forced ventilation type refrigerator having a low temperature chamber whose temperature is independently controlled.

[0002]

2. Description of the Related Art Recent household refrigerators are provided with a low temperature chamber whose temperature is independently controlled. Of these, a low temperature chamber provided in one compartment of a refrigerating chamber is disclosed in, for example, Japanese Patent Application Laid-Open No. Hei 5 (1999) -58200. An example is shown in Japanese Patent Publication No. -71848. Hereinafter, description will be given with reference to FIG.

Reference numeral 1 denotes a refrigerator main body, which is divided by partition walls 2 and 3 into a drawer type freezer compartment 4 in the center, a refrigerating compartment 5 in the upper part, and a drawer type vegetable compartment 6 in the lower part. Reference numeral 7 is a low temperature room provided under the refrigerating room 5 for the purpose of preserving fresh food and the like with good freshness.

Reference numeral 8 is a refrigeration cycle compressor, 9 is a cooler,
Reference numeral 10 is a condenser, and 11 is a blower for forcedly ventilating the cool air cooled by the cooler 9 to the freezing compartment 4, the refrigerating compartment 5, the vegetable compartment 6 and the low temperature compartment 7. Further, reference numeral 12 is a temperature detector which is provided in one portion of the freezer compartment 4 and controls the operation of the compressor 8 and the blower 11.

Reference numeral 13 is a damper device for adjusting the amount of cold air flowing into the low temperature chamber 7. Reference numeral 14 denotes a cold air ventilation duct that is formed on the top surface of the low temperature chamber 7 and communicates with the damper device 13 to send in cool air. Reference numeral 15 denotes a cold air discharge hole that is opened inside the room.

Reference numeral 16 is a temperature detector which is provided in one section of the low temperature chamber 7 and controls the opening / closing of the damper device 13. 17 is a slide-type container for placing food, 1
Reference numeral 8 is a door that hangs down and is attached to the front opening.

In such a structure, the cool air cooled by the cooler 9 by the operation of the compressor 8 is forcedly ventilated into each room by the blower 11 which is operated in synchronization with the compressor 8. That is, for the low temperature chamber 7, the opening / closing of the damper device 13 is controlled by the temperature detected by the temperature detector 16,
A required amount of cool air is sent from the top surface of the room through the cool air ventilation duct 14 and the cool air discharge hole 15 to reach a predetermined temperature (for example, −
It is cooled to 3 ° C.

[0008]

However, while it is usually required that the low temperature room can store fresh food and the like with good freshness, temperature unevenness occurs in the room depending on the usage conditions of the refrigerator and the storage conditions of the food. For example, when the outside air temperature is high, the open ratio of the damper device is increased to maintain the room at a predetermined temperature, and the introduction time of the cool air becomes relatively long.

For this reason, the temperature difference between the vicinity of the cool air discharge hole and the other portions increases, resulting in temperature unevenness. In addition, when a large amount of food is stored or when food is stacked and stored, cold air does not spread sufficiently to various places inside the room, and therefore temperature unevenness between the food stored in the front, back, up and down of the room further expands.

For these reasons, temperature variations occur in the low temperature chamber under various conditions in actual use, and as a result, the stored quality of the stored foods varies, and a certain degree of freshness cannot be maintained. .

On the other hand, a wide range of foods can be used as foods stored in the low temperature room, but the proper temperature is not always uniform, but only one storage section or set temperature is prepared. However, they also had the problem that sufficient storage quality could not be provided.

In view of the above-mentioned problems, it is an object of the present invention to provide a refrigerator having a low temperature chamber for suppressing the temperature unevenness in the room under actual use conditions and improving food storage quality at an appropriate storage temperature.

[0013]

In order to solve the above problems, the refrigerator of the present invention forms an air circulation air passage for circulating the air in the room separately from the cool air discharge air passage for cooling the low temperature room, A second blower for forced circulation is provided in the low temperature chamber for the air circulation air passage.

Further, a cool air discharge hole is provided on the top surface of the low temperature chamber, and a heat conducting plate is provided on the bottom surface opposite to this.

Further, the low temperature chamber is divided into first and second low temperature chambers having different temperature settings.

Further, the second blower is configured to control the operation when the compressor is stopped.

Further, an outside air temperature detector is provided so that the operating ratio of the second blower is gradually reduced when the outside air temperature decreases.

[0018]

In the refrigerator of the present invention having the above-described structure, the air in the low temperature chamber is circulated by the forced ventilation of the second blower, and the temperature is converged regardless of the food storage state.

Further, the cooling air is discharged uniformly from the top of the room to be uniformly cooled in a plane, and the heat-insulating effect of the heat conducting plate provided on the bottom surface suppresses the temperature unevenness of the lower food products such as when stacked and stored.

Further, the low temperature chamber is divided into two different temperatures so that the food can be properly stored.
Furthermore, the operation of the second blower is controlled when the compressor is stopped, and the temperature equalizing action is performed without hindering the cold air discharge action to the low temperature chamber.

Further, the operating ratio of the second blower is gradually reduced due to the decrease of the outside air temperature, and unnecessary air circulation action is avoided.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A refrigerator according to an embodiment of the present invention will be described below with reference to FIGS. The same components as those of the related art are designated by the same reference numerals, detailed description thereof will be omitted, and only different portions will be described.

Reference numeral 19 is a refrigerator main body. Reference numerals 20 and 21 are first and second low temperature chambers provided at the lower part of the inside of the refrigerating chamber 5 and divided into two chambers by an intermediate partition plate 22 having different temperatures. For example, the first low temperature chamber 20 is about -1. The temperature of the second low temperature chamber 21 is set to about -3 ° C.

Reference numeral 23 is a damper device for adjusting the amount of cold air flowing into the first and second low temperature chambers 20 and 21. 24 is
The first and second low temperature chambers 2 are communicated with the damper device 23.
This is a discharge air passage formed by a cool air ventilation duct 25 formed on the top surface of Nos. 0 and 21 and a cool air discharge hole 26 opening in the room.

Further, 27 is the first and second low temperature chambers 20,
21 is a second blower provided inside the low temperature chamber 20. 28
Is an air circulation air passage which is provided separately from the cool air discharge air passage 24 and is constituted by an air discharge hole 29 and an air suction hole 30 which are communicated with the second blower 27 and are opened in the room.

Further, 31 and 32 are containers provided with vent holes in the front portions provided in the first and second low temperature chambers 20 and 21, respectively, and 33 and 34 are provided on the bottom surfaces of the containers 31 and 32, respectively. It is a good heat conducting plate such as an aluminum plate.

Reference numerals 35 and 36 denote doors hanging down from the front portions of the respective rooms. Furthermore, 37 is a temperature detector which is provided in one screen in the first low temperature chamber 20 and controls the opening / closing of the damper opening / closing device 23, and 38 is the main body 19
It is an outside air temperature detector provided in a part of the outline of the.

Further, the basic control of the operation of the second blower 27 is configured so that it is operated for a predetermined intermittent operation time t1 / t2 when the compressor 8 of the refrigeration cycle is stopped.

Further, the ratio of the intermittent operation time t1 / t2 is configured to gradually decrease as the outside air temperature T decreases.

That is, as shown in the time chart of FIG. 4, when the outside air temperature T> T1 (T1 = 30 ° C.), for example, t1
/ T2 = 20/10 minutes, T2 <T ≦ T1 (T1 = 30
C, T2 = 10 ° C.) t1 / t2 = 15/20 minutes, T
When 2 ≧ T (T2 = 10 ° C.), t1 / t2 = 10/40 minutes. Reference numeral 39 is a control means such as a microcomputer for controlling these operations.
Are first, second, and third timers that count the intermittent operation time t1 / t2 that changes depending on the outside air temperature.

In such a structure, when the compressor 8 is operating, the temperature detector 37 detects the temperature in the first low temperature chamber 20 and if the temperature is equal to or higher than a predetermined temperature, the damper of the damper device 23 is opened to cool the cooler. The cool air from 9 is blown into the room from the top surfaces of the first low temperature chamber 20 and the second low temperature chamber 21 by the blower 11 via the cool air ventilation duct 25 and the cold air discharge holes 26.

When the temperature detector 28 detects a temperature equal to or lower than the predetermined temperature, the damper of the damper device 23 is closed and the cold air flow into the room is stopped. In this way, the first low temperature chamber 2
The 0 and second low temperature chambers 21 are cooled and maintained at predetermined temperatures, for example, about −1.5 ° C. and about −3 ° C., respectively.

Next, when the compressor 8 is stopped, the second blower 27 is operated at an intermittent operation time ratio according to the outside air temperature detected by the outside air temperature detector 38. Therefore, the indoor air is forcibly circulated in the circulation path from the air discharge hole 29 to the air suction hole 30 via the vent holes at the front of the containers 31 and 32, and the inside of the first low temperature chamber 20 and the second low temperature chamber 21. The temperature of each is made uniform.

At this time, since the second blower 27 is not operated during the operation of the compressor 8, the cooling operation from the damper device 23 is not hindered and the temperature equalizing operation can be efficiently performed. In addition, since the necessary cooling action is sufficiently performed in each low temperature chamber to make a temperature difference and then the air is circulated, the two low temperature chambers can be simultaneously temperature-controlled by one circulation fan. .

As a result, the food items stored in the first low temperature chamber 20 and the second low temperature chamber 21 are stored in the respective chambers in a state where there is little temperature unevenness, and the quality can be stably maintained. .

Further, since the intermittent operation time ratio of the second blower 27 also decreases when the outside air temperature decreases, it is possible to reasonably evenly consume the unnecessary electric power at a low outside temperature when the temperature unevenness is relatively reduced. The temperature can be increased.

In the practical state, foods are often stacked and stored, but in this case also, the above-mentioned second
Combined with the temperature equalizing effect of the blower 27, the temperature nonuniformity of the foods above and below is also reduced by the heat insulation effect of the heat conducting plates 33 and 34 provided on the bottom surface, and the entire room is irrespective of the amount or state of food stored. Is soaked.

Furthermore, the first low temperature chamber 20 has a temperature of about -1.5.
Since the temperature of the second low temperature chamber 21 is set to about -3 ° C, the temperature of the second low temperature chamber 21 is set to about -3 ° C. By storing the foods in the second low temperature chamber 21 and the other fresh foods and processed foods in the first low temperature chamber 20, the foods can be stably stored at a more suitable temperature, and the preservation quality can be further improved.

[0039]

As described above, according to the refrigerator of the present invention,
The following effects can be obtained.

Since the temperature of the low temperature chamber is uniformly stabilized by the forced air circulation action of the second blower, a great effect can be obtained for stable quality maintenance regardless of the amount of food stored.

Further, due to the cooling effect of the heat conducting plate provided on the bottom surface of the room, it is possible to have the effect of suppressing unevenness in food temperature above and below even when stacked and stored in practical use.

Further, since the operation of the second blower is controlled when the compressor is stopped, the original cooling action to the low temperature chambers is not hindered and the two low temperature chambers are soaked by air circulation. Can be converted.

Further, since the intermittent operation ratio of the second blower is gradually reduced due to the decrease in the outside air temperature, which originally tends to reduce the temperature unevenness, it is possible to rationalize the temperature ratio rationally without unnecessary power consumption.

Further, since the low temperature chamber is divided into two chambers having different temperatures, it can be stably stored in a state close to a temperature more suitable for the food group, and especially for maintaining the quality of foods such as fresh foods requiring freshness. Great effect can be obtained.

[Brief description of drawings]

FIG. 1 is a detailed perspective view of a low temperature room of a refrigerator showing an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of a refrigerator including the low temperature chamber shown in FIG.

FIG. 3 is a control block diagram of the refrigerator shown in FIG.

4 (a) time chart of outside air temperature T> T1 (° C.) in FIG. 2 (b) time chart of outside air temperature T2 <T <T1 (° C.) in FIG. 2 (c) outside air temperature T ≦ in FIG. Time chart of T2 (℃)

FIG. 5 is a vertical sectional view of a refrigerator showing a conventional example.

[Explanation of symbols]

 4 Freezer 5 Refrigerator 8 Compressor 9 Cooler 10 Condenser 11 Blower 20 First low temperature chamber 21 Second low temperature chamber 23 Damper device 24 Cold air discharge air duct 25 Cold air ventilation duct 26 Cold air discharge hole 27 Second fan 28 Air Circulation Air Path 29 Air Discharge Hole 30 Air Suction Hole 33, 34 Heat Conductive Plate 37 Low Greenhouse Temperature Detector 38 Outside Air Temperature Detector

Claims (5)

[Claims] 1. A refrigeration cycle including a compressor, a condenser, a cooler, etc., a freezing compartment, a refrigerating compartment, a low temperature compartment, a blower for forcedly ventilating cold air into each compartment, and an amount of cold air to the low temperature compartment. A damper device for adjusting the temperature, a temperature detector provided in the low temperature chamber to control the damper device, a second blower provided in one part of the low temperature chamber, a cool air ventilation duct communicating with the damper device, and the A cold air discharge air passage formed by a cold air discharge hole opened in the low temperature chamber, the low temperature air passage communicating with the second blower, and an air discharge hole opened in the low temperature chamber communicating with the second blower. And a refrigerator provided with an air circulation air passage configured by a suction hole. 2. The refrigerator according to claim 1, wherein the cold air discharge holes are provided on the top surface of the low temperature chamber, and the bottom surface of the low temperature chamber is provided with a heat conductive plate. 3. The refrigerator according to claim 1, wherein the low greenhouse is divided into a first low temperature chamber and a second low temperature chamber having different set temperatures. 4. The refrigerator according to claim 1, 2 or 3, wherein the operation of the second blower is controlled when the compressor is stopped. 5. The refrigerator according to claim 4, wherein an outside air temperature detector is provided in a part of the outer shell of the main body, and the operating ratio of the second blower is gradually reduced with a decrease in the outside air temperature according to a signal from the outside air temperature detector.