JP2584342B2 - Refrigeration / refrigerator cooling control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial application field The present invention relates to a cooling room in which a cooler or the like is arranged in the upper part of a main body, a freezing room in which a partition plate is arranged in a refrigerator, and a refrigerator room in the lower part. And a two-temperature refrigerator.

(B) Conventional technology This type of refrigerator is provided with a refrigeration discharge duct and a refrigeration suction duct which communicate the refrigeration compartment and the refrigeration compartment, and these ducts allow a part of the cold air in the refrigeration compartment to be supplied to the refrigeration compartment. The cold air that has been guided and returned to the freezing room after the cooling operation is returned to the freezing room to circulate the cool air to cool the refrigerating room.

For example, an example of the configuration can be found in Japanese Utility Model Publication No. Sho 60-9661.

In this refrigerator, a blower for introducing cool air is arranged in the refrigerator compartment, and the blower is ON / OFF controlled by a temperature controller provided in the refrigerator compartment to control the amount of introduced cool air, and to control the amount of the cool air introduced into the refrigerator compartment. Temperature control is being performed. In addition, a method has been proposed in which an electric damper is arranged near the discharge port of the refrigeration suction duct, and similarly, a temperature controller controls ON / OFF of the electric damper to control the amount of introduced cool air, thereby controlling the temperature. I have.

(C) Problems to be Solved by the Invention However, according to the control method disclosed in this publication, the refrigeration blower keeps rotating until the temperature of the refrigeration room reaches a predetermined temperature, and the electric damper Also remain open.

Therefore, taking the electric damper control as an example, if the load on the refrigerator compartment increases, the electric damper does not close until the refrigerator compartment reaches the set temperature value, and remains open, and as a result, the electric damper becomes more constant than the freezer compartment. The cold air continues to be introduced into the refrigerator compartment and exchanges heat in the refrigerator compartment, and the cold air whose temperature has risen continues to return to the freezer compartment for a long period of time, resulting in a rise in the temperature of the freezer compartment. In such a situation (for example, −10 ° C. or higher), a problem occurs in that frozen foods such as ice cream stored in the freezing room are melted.

The present invention has been made in view of the above point, when the temperature condition of the freezer compartment, the situation where the temperature is higher than the predetermined temperature continues,
An object of the present invention is to provide a freezer / refrigerator that controls so as to reduce the amount of cold air introduced into a refrigerator compartment, performs preferential cooling in the freezer compartment, and does not cause a bad situation such as food dissolution.

(D) Means for Solving the Problems In the present invention, a main body is constituted by a heat insulating wall, and a refrigerator compartment is formed in an upper portion by a heat insulating partition plate and a refrigerator compartment is formed in a lower portion by a heat insulating partition plate.
A cooling room having a cool air suction port and a cool air discharge port above the refrigerator and having a cooler and a blower installed therein is provided, and a part of the cold air in the freezing room is introduced into the cold room and returned to the freezing room. The freezer compartment and the refrigeration compartment are communicated via a refrigeration discharge duct and a refrigeration suction duct, and the circulation amount of cold air in the refrigeration compartment is adjusted by opening / closing an electric damper provided in the refrigeration compartment or turning on / off a refrigeration blower. In a freezer / refrigerator configured to control the temperature of a refrigerator, when the temperature of the refrigerator becomes equal to or higher than a predetermined temperature for a certain period of time, the opening degree of the electric damper or the rotation speed of the refrigerator fan is reduced. It is controlled as follows.

(E) Operation In a normal cooling state, the electric damper is fully closed and fully opened, and the refrigerating blower is also rotated and stopped to maintain the refrigerating room in a predetermined temperature range.

However, the load on the refrigerator compartment increases, and the temperature of the cold air that has increased due to heat exchange in the refrigerator compartment continues to return to the refrigerator compartment, and the temperature of the refrigerator compartment rises and the temperature rises above a predetermined temperature. After a lapse of time, the control means is operated to control the electric damper so that the degree of opening of the electric damper is decreased from the fully opened state, and the rotational speed of the refrigeration blower is decreased. As a result, the amount of cold air sent to the refrigerator compartment is reduced, and a rise in the temperature of the freezer compartment is prevented.

(F) Example Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.

FIG. 1 to FIG. 4 show a refrigerator / refrigerator in a case where cold air is introduced from a freezer compartment to a refrigerator compartment by using an electric damper.

In each of the drawings, reference numeral 1 denotes a refrigerator / refrigerator having a main body constituted by a heat insulating wall 2 having a front opening, and a heat insulating partition plate 3 is disposed in a refrigerator to form a freezing compartment 4 at an upper portion and a refrigerator compartment 5 at a lower portion. Heat-insulating doors 6, 6 capable of opening and closing the front openings of both chambers are pivotally attached to the main body. Numeral 7 denotes a cooling chamber provided with a cooler 8 and a blower 9 for stopping the operation only at the time of defrosting. When the blower 9 rotates, air in the freezing room is favored by the cooling chamber 7 as shown by an arrow in FIG. The heat is exchanged in the cooler 8 and discharged to the freezing room 4 again to cool the freezing room products, and then circulates back to the cooling room 7. Reference numeral 10 denotes a cooling chamber top cover. Reference numeral 11 denotes a refrigeration discharge duct provided so as to introduce a part of the refrigeration compartment cold air sucked into the refrigeration compartment 7 into the refrigeration compartment 5, and is formed so as to be embedded in the heat insulating wall 2 serving as a side wall of the main body. The upper end 12 is open to the cooling chamber 7, and the lower end 13 is open to the refrigerator 5. Similarly, the upper end port 14 is opened to the cooling chamber 7 and the lower end port 15 is opened to the cooling chamber 5 so as to return cold air from the refrigerator chamber 5 to the cooling chamber 7. It is buried in the wall 2. Therefore,
The freezer compartment 4 and the refrigerating compartment 5 communicate with each other via the cooling compartment 7 by the two ducts 11 and 16. Incidentally, a suction / discharge box 17 is provided in the refrigerator compartment 5. The suction / exhaust box 17 is provided with an electric damper 18 which is opened and closed by a motor 18A facing the lower end port 13 of the refrigeration discharge duct 11, i.e., the cool air discharge port, and at a position opposite to the electric damper 18. Is provided with a cool air circulator 19. The opening and closing of the electric damper 18 is controlled depending on the temperature set for the freezer compartment 4 or the temperature set for the refrigerator compartment 5.
It is controlled to be fully open and half open. Thus,
When the electric damper 18 opens and the cool air circulator 19 rotates,
Part of the cold air from the freezer compartment 4 enters the refrigerator compartment 5,
The inside of the refrigerator compartment 5 is cooled by circulating as indicated by the arrows in the figure.

FIG. 5 shows a flowchart for controlling the electric damper 18 to be fully open / fully closed / half open.

The compressor (not shown) which forms a refrigerating apparatus together with the cooler 8 and the condenser is turned on when the freezing room temperature _TF reaches a preset upper limit temperature _{TF ON} , and is turned _off when the temperature falls to the lower limit temperature _{TF OFF.} Has become. Therefore, first judgment 3
If T _F ≧ _{TF ON} at 1, a process 32 for turning on the compressor is performed, and if T _F ≦ _{TF OFF} , a process 33 for turning _{off the} compressor is performed. Thus the compressor decides 31
ON / OFF control is performed, and the inside of the freezing room 4 has a predetermined temperature range (T _F
It is maintained in _{OFF <T F <T F ON} ). By the way, after the compressor is turned on, the temperature condition in the freezer 4 is monitored, and T _F
It is determined in the determination 34 whether or not the situation where the temperature becomes -10 ° C. or more at which there is a risk of melting ice cream or the like continues for 20 minutes or more. If the judgment 34 is NO and the temperature of -10 ° C or more does not last for 20 minutes, or if the compressor is OFF (processing 3
(3) is a part of the cold air in the freezer compartment 4 which is sent to the refrigerator compartment 5 and used for the cooling action of the refrigerator compartment 5, but adversely affects the cooling of the freezer compartment 4 by raising the temperature of the freezer compartment 4. There is no situation. Thus by detecting the refrigerating compartment temperature T _R, the refrigerating compartment temperature T _R
However, whether the temperature is equal to or higher than the preset upper limit temperature T _{R ON} for fully opening the electric damper 18 or equal to or lower than the lower limit temperature T _{R OFF} for fully closing the electric damper 18, the process proceeds to a comparison determination 35. The damper 18 is fully closed and fully opened. That is, if T _R ≧ T _{R ON} , the electric damper 18 is fully opened.
On the other hand, if T _R ≦ T _{R OFF} , the process goes to a process 37 for fully closing the electric damper 18.

In this manner, the temperature is controlled by the ON / OFF of the compressor and the fully closed / fully opened control of the electric damper 8 so that the freezing room 4 and the refrigerating room 4 are each within an appropriate predetermined temperature range.

However, the freezing room temperature T at which the determination 34 becomes YES
_{If the} situation where _F becomes −10 ° C. or more continues for 20 minutes or more, the load on the refrigerator compartment 5 is large, and the cool air that is introduced from the refrigerator compartment 4 to the refrigerator compartment 5 and exchanges heat to return to the refrigerator compartment 4 has a considerable temperature. It is estimated that the temperature of the freezing compartment 4 is insufficient and the freezing compartment 4 is insufficiently cooled, and the temperature of the freezing compartment 4 rises. Therefore, in that case, it is urgently necessary to further reduce the amount of cold air introduced into the refrigerator compartment 5. Therefore, similarly to the previous decision 35 determines 38, the refrigerating compartment temperature T _R is compared determines the upper limit temperature T _{R ON} or the lower limit temperature T _{R OFF} is performed. Then, if T _R ≧ T _{R ON} , a process 39 for half-opening the electric damper 18 is executed. In this way, the amount of cold air introduced into the refrigerator compartment 5 is reduced by half.
The temperature inside will begin to drop gradually. Until the freezing room temperature _TF falls below −10 ° C. in the judgment 40 (Y), the electric damper 18 is turned off.
Maintains half open, and, if the T _R ≦ T _{R OFF} by the refrigerating compartment temperature T _R is determined 38 electric damper 18 is fully closed process 41
Is performed.

In this way, when the freezing room temperature _TF continues to be −10 ° C. or more for 20 minutes or more, the electric damper 18 is controlled to be half-opened ← fully closed, and if the freezing room temperature _TF becomes −10 ° C. or less. , The determination 40 becomes N, and the control returns to the control mode of the electric damper 18 based on the full open / full close again.

FIG. 6 is a diagram showing temperature changes in the freezing room and the refrigerating room in the conventional control and the present invention control when the load in the refrigerating room is increased. In the freezing room, the present invention control indicated by a dotted line A is better. Compared to the conventional control shown by the solid line B, it can be seen that the temperature does not rise from around -10 ° C.

Further, the temperature change in the refrigerator compartment is shown by a dotted line C in the case of the control of the present invention, and a solid line D in the case of the conventional control.

In the embodiment, the example of the electric damper has been described.
In the case of fan control, reducing the number of revolutions of the refrigeration fan corresponds to the electric damper half-opening operation, and the same control can be performed.

Further, the condition of the judgment 34, that is, the temperature (−10 ° C.), the duration (20 minutes), and the like can be freely set.

(G) Effects of the Invention As described above, in the conventional control, the heat load of the refrigerator compartment increases, and the electric damper remains open until the refrigerator compartment temperature reaches the set value, and the refrigerator blower keeps rotating, The temperature of the cold air introduced into the refrigerator compartment from the freezer compartment rises and returns to the freezer compartment, and the freezer compartment rises in temperature. In such a case, according to the present invention, the freezer compartment temperature becomes equal to or higher than a predetermined temperature. After a certain period of time, the opening degree of the electric damper is reduced, and the number of rotations of the cool air blower is reduced, so that the amount of cool air sent to the refrigerator compartment is narrowed. Therefore, since the temperature in the freezing room is prevented from rising, the stored product in the freezing room such as ice cream is not melted. Then, when the freezing room falls to the normal cooling temperature, the electric damper and the refrigeration blower are controlled to return the amount of circulating cold air to the refrigeration room again, and the cooling of the refrigeration room is also smoothly performed,
Cooling control can be performed on both the freezing room and the refrigerator room without any inconvenience.

[Brief description of the drawings]

FIG. 1 is a front view of a refrigerator / refrigerator, FIG. 2 is a side view, and FIG.
1 is a sectional view taken along line AA in FIG. 1, FIG. 4 is a sectional view taken along line BB in FIG. 2, FIG. 5 is a flowchart of the cooling control device of the present invention, and FIG. It is a comparison figure showing the temperature change of the freezing room and the refrigerating room by the conventional control. 4 ... freezer room, 5 ... refrigerator room, 7 ... cool room, 8 ... cooler, 9 ... blower, 11 ... discharge duct for refrigeration, 16 ...
Refrigeration suction duct, 18 ... Electric damper.

Claims (1)

(57) [Claims] 1. A main body is constituted by a heat insulating wall, and a refrigerator compartment is formed at an upper portion and a refrigerator compartment is formed at a lower portion by a heat insulating partition plate inside the refrigerator.
A cooling room having a cool air suction port and a cool air discharge port above the refrigerator and having a cooler and a blower installed therein is provided, and a part of the cold air in the freezing room is introduced into the cold room and returned to the freezing room. The freezer compartment and the refrigeration compartment are communicated via a refrigeration discharge duct and a refrigeration suction duct, and the circulation amount of cold air in the refrigeration compartment is adjusted by opening / closing an electric damper provided in the refrigeration compartment or turning on / off a refrigeration blower. In a freezer / refrigerator configured to control the temperature of a refrigerator, when the temperature of the refrigerator becomes equal to or higher than a predetermined temperature for a certain period of time, the opening degree of the electric damper or the rotation speed of the refrigerator fan is reduced. A cooling control device for a freezer / refrigerator, comprising a control means for performing such control.