JPS6080068A - Rapid refrigerator for refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a rapid freezing device in which a direct cooling type auxiliary cooler is provided in a part of a freezer compartment used in a forced air type refrigerator-freezer or the like.

The structure of the conventional example and its problems The conventional example will be explained with reference to FIGS. 1 and 2. Reference numeral 1 denotes a main cooler 4 housed in a cooling chamber 3 constructed within a partition wall 2. This is a forced draft type refrigerator in which air cooled by the main cooler 4 is circulated by a blower 5 to a freezing chamber 6 and a refrigerating chamber 7. 6' is freezer compartment 6
This is a quick-freezing chamber that is separately equipped with a direct cooling type auxiliary cooler 8, and is used to quickly freeze food.

A damper thermostat 14 is provided at the entrance of the refrigerator compartment 70 to adjust the amount of cold air inflow. As shown in Figure 2, the refrigeration cycle consists of a normal flow path that circulates from compressor 9 to condenser 10 to first subtube 11 to main cooler 4 to compressor 9, and from compressor 9 to condenser 1o. → second capillary tube 12 → auxiliary cooler 8 → main cooler 4 → compressor 9 and a flow path control device 13 (hereinafter referred to as the switching valve 13) that switches to the circulating flow path for rapid freezing. The rapid freezing action is performed by switching the flow path of the switching valve 13. During this quick freezing, the compressor 9
be forced to operate continuously. At this time, the number of heat exchangers in the main cooler 4 is reduced, the evaporation temperature of the auxiliary cooler 8 is maintained at a low temperature, and the freezing speed of the food in contact with the auxiliary cooler 8 is increased. The quick freezing effect is determined by the choice of whether to stop the operation of the blower 6 or to operate the blower 5 and give priority to increasing the amount of heat exchange by forced convection. However, during rapid freezing, the blower 6 was operated.

Alternatively, when instructing to stop, a general method is to divide the quick freezing time into predetermined times and switch. However, in this case, there is no correlation with the article temperature and the grain is rough as a control method. Another method is to use a temperature detection device that indirectly detects the temperature of the article, but in this case as well, the temperature at which the blower 5 is operated and stopped is set and the temperature is controlled based on this. The temperature to be commanded differs depending on the size of the stored goods, etc., and there is a drawback of lack of versatility.Purpose of the Invention In view of the above points, the present invention has developed a blower for forced ventilation during rapid freezing in the most efficient manner. The purpose is to operate and stop the system to achieve a rapid freezing effect.

Structure of the Invention To achieve this objective, the present invention detects the freezing temperature of an article during quick freezing, calculates the temperature gradient based on this, operates the blower before the freezing temperature range is reached, and then stops it. This prevents uneven quick freezing effects due to two types of stored items, etc.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 3, 4, 5, and 5. Incidentally, the same parts as those in the prior art are denoted by the same reference numerals, and the description thereof will be omitted.

Reference numeral 14 denotes a temperature detector that detects the temperature of the freezer compartment, and outputs an operation signal to operate the compressor 9 of the refrigerator. Reference numeral 15 is a quick freezing switch which manually outputs an ON/OFF signal.

Reference numeral 16 denotes a negative 6-page load temperature sensor which is installed in a part of the deep freezing chamber 6' and is representative of temperature changes of stored articles. Reference numeral 17 is an operating relay that connects the compressor 9 to the power source, and the switch 17 connects the compressor 9 to the power source.
are connected in series.

18 is a relay for operating the blower 5, and the blower 6 is connected in series with the switch 18' and then in parallel with the compressor 9. 19 is a relay for the flow path switching valve 13, and the switching valve 13 is connected in series with the switch 19' and then connected in parallel with the power source. This switching valve 13 is configured to switch to the normal flow path when the coil is conductive, and to switch to the quick freezing flow path when the coil is not conductive. Here, the relay 17 is configured to close a switch 17' when the excitation coil is energized, and the relays 18 and 19 close their contacts when the excitation coil is not energized. 20 is a control circuit, a microcomputer (CPU) 21, RA
ROM23 is formed from M22, ROM23, etc.
A program is stored in which determines the next action based on the confirmation order of actions and the state at that time. Further, the control circuit 20 includes a timer 6 page 24 for quick freezing, which determines the maximum time of quick freezing operation by the quick freezing switch 16, for example, about 90 minutes.

Next, the operation will be explained with reference to FIG.

When the power is turned on, the temperature sensor 14. Quick freezing switch 16. Each state of the load temperature detector 16 is input and written as step 1, and is stored in the RAM 22. Next, RAM
The state of the quick freezing switch 16 is read from 22, and it is determined in step 2 whether the quick freezing switch 16 is ON or OFF. The following explanation will be based on the assumption that the power has just been turned on and has not yet cooled down. Step 2
When it is determined that the quick freezing switch 16 is OFF, the RAM 22 that stores the information that the quick freezing is in progress is reset in step 3. Next, in step 4, it is determined from the RAM 22 whether the temperature detector 14 has detected a temperature equal to or higher than the set temperature.

At this time, if the temperature is higher than the set temperature, relay 17 is activated and switch 17' is turned on.

In step 6, the compressor 9 is operated. This step 1
The process continues from step 6, and when the refrigerator gets cold, if the temperature detector 14 outputs a temperature lower than the set temperature in step 4, the switch 17' of the -S relay 17 is turned OFF at step 6. Then, the compressor 9 is stopped and the process returns to step 1. This operation is repeated, and if the temperature detector 14 outputs a temperature higher than the set temperature in step 4, step 5 is performed, the compressor 9 is operated, and the process returns to step 1. is repeated repeatedly.

Next, when the quick freezing switch 15 is turned on, step 2
The fact that the quick freezing switch has been operated is read from the RAM 22, and the quick freezing state is stored in the RAM 22 in step 7. Further, in step 8, the quick freezing timer 24 is started, and the steering knob 9 is used to determine whether the quick freezing switch 16 or the quick freezing timer 24 indicates completion. If quick freezing is indicated, step 10 determines whether it is time to start quick freezing based on the quick freezing timer 240 hours. Initial temperature (-T1) in RAM
22. Then, in step 12, it is determined whether the operation timer 24 has reached, for example, 10 minutes, and if it has not, the process goes to step 13, where the relay 19 is activated and the switch 19' operates the switching valve 13. let Then, in step 14, the relay 17 is operated and the switch 17' is operated to operate the compressor 9, and the process returns to step 1. Then, the process proceeds to steps 1.2, 7, and 8.9, and in step 10, it is determined by the RAM 22 that it is not time to start rapid freezing, and steps 12, 13.14, and the like are repeated.

As such quick freezing operation progresses, when it is determined in step 12 that the quick freezing timer 24 has reached, for example, 10 minutes, the load temperature detector 16 in the step knob 16 detects the load temperature after 10 minutes ( -T2) is stored in the RAM 22.

Note that the temperature thereafter is not stored as T2. Then, in step 16, A-10T/(T, -T2) is calculated, and the time A required to reach the freezing temperature range (for example, 0''C) is calculated and stored in the RAM 22.Next, step 17 Compare A with the rapid freezing timer 24, and if it is less than A, proceed to step 13.14, synchronize the operation of the blower 6 with the operation of the compressor 9 as before, and return to step 1 and repeat.Furthermore, If the quick 9 page freezing operation progresses and the quick freezing timer 24 is equal to or higher than A in step 17, then in step 18 relay 1 is activated.
8, turn on the switch 18' to stop the blower 6,
Go to step '13.14 and return to step 1. Then, the quick freezing timer 24 is activated for a set time (for example, 90
(minutes), the process moves from step 9 to step 19, and each switch 17 of relay 17, 18, 19 is
．． 18.19 to QFF l,, compressor 9. Blower 5. The switching valve 13 is stopped. That is, as shown in FIG. 5, the temperature transition of an article during quick freezing varies from the initial temperature T1 ('C) to the temperature T2 ('C) 10 minutes later, depending on the freezing temperature range of the article (for example, 0°C). Predict the time to reach 0°
During time A up to point C, priority is given to the amount of heat exchange by forced convection due to the operation of the blower 6, and for 8 hours, an even more rapid temperature effect is required.

By stopping the blower 5, reducing the amount of heat exchange in the main cooler 4, and maintaining the evaporation temperature of the auxiliary cooler 8 at a low temperature, a control method suitable for freezing the article is carried out.

Page 10 Effects of the Invention As is clear from the above configuration, the present invention provides a quick freezing chamber equipped with a direct cooling type auxiliary cooler in the freezer compartment of a forced ventilation type refrigerator-freezer, and during normal cooling, the main cooling The device is equipped with a flow path control device that allows the refrigerant to flow between the main cooler and the auxiliary cooler during rapid cooling. As a means of operating the blower before reaching the point and stopping it after reaching the point,
The method uses temperature detection by a load temperature detector that represents the temperature transition of the article to calculate the temperature drop gradient of the article and predicts the time it will take to reach the freezing temperature range to operate and stop the blower. , it is versatile even for articles of mass, and reliable control commands can be performed, making it extremely effective in practical use.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a conventional refrigerator, Fig. 2 is a piping diagram of its refrigeration cycle, Fig. 3 is a schematic diagram showing a quick freezing device for a refrigerator according to an embodiment of the present invention, and Fig. 4 on page 11 is an operating state. FIG. 5 is a flowchart showing the time-temperature characteristics during freezing of the article. 3... Cooling room, 4... Main cooler, 6...
... Freezer room, 7... Refrigerator room, 5...
...Blower, 8...Auxiliary cooler, 6'...
... Rapid freezing room, 9 ... Compressor, 13 ...
...Flow path control device, 14...Temperature detector, 16
...Load temperature detector, 20...Control circuit.

Claims (1)

[Claims] A blower that circulates the air cooled by the main cooler provided in the cooling chamber to the freezer and refrigerator compartments, a quick-freezing room through which the air cooled by the main cooler passes through the freezing room, and disposed within the quick-freezing room. a direct cooling type auxiliary cooler; a flow path control device that controls whether the refrigerant flows only to the main cooler or to both the main cooler and the auxiliary cooler;
Rapid freezing is performed by continuously operating the compressor of the refrigerator and continuously flowing refrigerant to the auxiliary cooler, and a load temperature detector is provided to detect the temperature of the articles stored in the rapid freezing chamber. A quick freezing device for a refrigerator, comprising a control circuit that detects the temperature of the article, calculates a freezing temperature gradient, predicts the time to reach the freezing temperature range, and stops the blower after the time to reach the freezing temperature range.