JPS6066080A - 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 This field of industrial application relates to a rapid freezing device in which a direct cooling type auxiliary cooler is provided in a part of the freezer compartment of a forced ventilation type refrigerator-freezer.

Structure of a conventional example and its problems The conventional example is shown in FIGS. 1, 2, and 3. This is a forced draft type refrigerator, and air cooled by a main cooler 3 housed in a cooling chamber 2 is circulated to a freezing chamber 5 and a refrigerator chamber 6 by a blower 4. Reference numeral 7 denotes a quick-freezing room which is provided with a separate auxiliary cooler 8 of direct cooling type within the freezer room 6, and is used to quickly freeze food. A damper mostat 9 is provided at the entrance of the refrigerator compartment 6 to adjust the amount of cold air flow. As shown in Fig. 3, the refrigeration cycle consists of a normal flow path that circulates from the compressor 1o to the condenser 11 to the first capillary tube 12 to the main cooler 3 to the compressor 1o, and from the compressor 10 to the condenser 11 to second capillary 1
A flow path control device 14 (hereinafter referred to as a flow path switching valve) is provided on the flow path for rapid freezing that circulates between the auxiliary cooler 8, the main cooler 3, and the compressor 10, and the flow path switching of this switching valve 14 is provided. It is operated to perform a quick freezing effect. During this rapid freezing, the compressor 10 is forced to operate continuously, but the blower 4 reduces the amount of heat exchanged in the main cooler 3 and maintains the evaporation temperature of the auxiliary cooler 8 at a low temperature. In order to speed up the freezing of food that comes into contact with it, measures have been taken to stop the operation during quick freezing. However, when the forced ventilation blower 4 is stopped during rapid freezing,
If the door is opened and closed frequently or a heat load is applied to the inside of the refrigerator during high temperature and high humidity, 40 fans and 1 fan may be stopped.
There is a risk that condensed water that has recently landed on the fan 5 and the fan ring 16 will flow down to each other and freeze, causing the fan 15 and the fan ring 16 to lock due to the ice, resulting in the fan 15 not rotating even after normal cooling operation is resumed, resulting in serious malfunction. (A heater 17 for preventing fan lock is installed around the fan ring 16, but it is only energized during defrosting). For example, if quick freezing is performed within a short period of time after defrosting, there is a risk of fan lock.

Purpose of this invention In view of the above-mentioned points, an object of the present invention is to prevent the fan of the blower from freezing and locking during rapid freezing.

Required Configuration To achieve this objective, the present invention energizes the heater installed around the outer circumference of the fan to prevent the fan from freezing for a certain period of time immediately before the end of quick freezing due to the fan being stopped. This prevents freezing and locking.

DESCRIPTION OF EMBODIMENTS An embodiment of Takaaki Hon's invention will be described below with reference to FIGS. 4, 6, 7, and 8. Incidentally, the same parts as in the prior art are given the same reference numerals, and the explanation will be omitted.

In the figure, compressor 1Q is connected to a power source via relay 18, and blower 4 is connected in series with relay 19 and then in parallel with compressor 1o. The relay 2o is connected in series with the fan ring heater 17 and then in parallel with the compressor 10. The flow path switching valve 14 is connected in series with the relay 21 and then connected in parallel with the power source (this flow path switching valve switches to the normal flow path when the coil is conducting, and to the quick freezing flow path when the coil is not conducting). ). Here, the relays 18 and 20 are configured to close their contacts when the excitation coil is energized, and the relays 19 and 21 are configured to close their contacts when the excitation coil is not energized. Next, the control device for driving these relays will be described. Reference numeral 22 denotes a temperature control device, which includes a thermistor 23, resistors R1, R2, R3, and a comparator 24 provided in a part of the freezer compartment 5.
It consists of The output of the comparator 24 is configured to send a signal to turn on and off the relay 18 via an OR circuit 26 by a driver circuit (not shown) such as a transistor. 26 is a quick freezing switch. 27 is a quick freeze timer, and a quick freeze switch 26
After inputting, the a input becomes Hi for a short time as shown in Figure 8.
The gh signal (hereinafter simply referred to as the "H" signal) is input, thereby outputting an "H" signal to the b output during the quick freezing time T (for example, 90 minutes), and outputting the "H" signal just before the end of the quick freezing to the C output. “H” for a certain period of time t (for example, 10 minutes)
It is configured to output a signal. b output is OR
Input of circuit 25 and relay 19.21 are turned on and off.
The C output is connected to turn the relay 20 ON and OFF.

Next, the operating situation in such a configuration will be explained.

Normally, when the internal temperature of the refrigerator (freezer compartment temperature) is higher than a predetermined value, the resistance value RTH of the thermistor 23 becomes small, and the potential at point A determined by RTH and R1 of the temperature control device 22 increases. , becomes higher than the potential at point B determined by resistors R2 and R3, and the output of the comparator 24 becomes "H", so the output of the OR circuit 25 also becomes "H", and the relay 18 becomes a driver such as a transistor (not shown). It is turned on via the circuit and the compressor 1o operates. At this time, the quick freezing switch 26 is in the OFF state, so the output of the quick freezing timer 27 is "L", the relay 19 is on, and the blower 4 is operated. Also, relay 21 is also connected at the same time C)
Nl, the suction coil of the flow path switching valve 14 is energized, and the refrigerant circuit is connected to the compressor 10 - condenser 11 - first capillary tube 1
A circulation cycle of 2-main cooler 3-compressor 1o is configured to perform cooling. After that, when the inside of the refrigerator is cooled to a certain temperature, the resistance value RTH of the thermistor 23 is large and the potential A becomes smaller than the potential B, so the output of the comparator 24 becomes L''' and the rapid freezing timer is activated. Together with the "L"' signal from the b output of 27, the output of the OR circuit 25 also becomes L", so the relay 18 is turned off and the compressor 10. The blower 4 stops. Thereafter, this action is repeated to perform the normal cooling action.

Next, the rapid freezing operation will be explained. When the quick freezing switch 26 is arbitrarily turned on, output b of the quick freezing timer 27 continues to generate a "H" signal during the rapid cooling time T, so one input of the OR[! circuit 25 becomes "H". ', the output of the OR circuit 25 becomes °H' regardless of the output of the temperature control device 22, the relay 18 is turned ON, and the compressor 1o is immediately operated.At the same time, the relay 21 is turned ON.
When the FF is turned on, the flow path switching valve 14 is de-energized, the flow path is switched to the quick freezing flow path, and the auxiliary scraper 3 starts its cooling action. It's a trench, relay 19 is OFF and blower 4 is OFF during rapid freezing.

On the other hand, since the C output of the quick cooling timer 27 becomes the ``H'' signal for a certain period of time t immediately before the end of the quick freezing, the relay 2o is switched to 0.
Even if the fan 15 and the fan ring 16 are frozen and locked during rapid freezing when the fan ring heater 17 is energized by turning on the N, the ice is thawed by the heat generated by the fan ring heater 17
Fan 15 due to fan lock after returning to normal operation.
There is no such thing as not rotating.

As is clear from the above configuration, Honjomei is equipped with 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, only the main cooler is used. During quick freezing, the flow path control device switches the refrigerant to flow between the main cooler and the auxiliary cooler, and also stops the blower during quick freezing and locks the fan for a certain period of time just before the end of quick freezing. Since the heater is energized to prevent the fan from locking up, the fan lock will return to normal cooling operation after the quick freezing is completed and the fan will be unable to cool. This has the effect of eliminating the danger of

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of a conventional refrigerator, Fig. 2 is an enlarged view of the first fixed part, Fig. 3 is a refrigeration cycle piping diagram of the refrigerator shown in Fig. 1, and Fig. 4 is a diagram of the main unit. A sectional view of a refrigerator showing an embodiment of the invention, FIG. 5 is an enlarged view of the fourth solidification part, and FIG.
FIG. 7 is a control circuit diagram of the refrigerator, and FIG. 8 is a time chart of a quick freeze timer in the control circuit of FIG. 7. 3...Main cooler, 4...Blower, 7.
... Rapid freezing chamber, 8 ... Auxiliary cooler, 1
4... Flow path control device, 17... Heater, 26°°... Rapid freezing switch. Name of agent Patent attorney Toshio Nakao and 1 other person Figure 3 Figure 4

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 both the main coolers, and a refrigeration cycle compressor that operates continuously to perform the auxiliary cooling. a quick freezing switch that performs quick freezing by continuously flowing refrigerant through the container and stopping a blower; a heater installed near the outer periphery of the blower fan of the blower; A quick freezing device for a refrigerator that has a device that energizes the refrigerator.