JPS6110147Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a quick freezing device for a refrigerator that has a quick freezing function that can rapidly cool down the freezer compartment.The purpose of this invention is to Rapid freezing operation can be automatically performed after the pressure relationship in the refrigerant distribution system is in a balanced state, and therefore, it is possible to prevent the compressor from being started in an abnormally overloaded state due to rapid freezing operation. To provide a quick-freezing device for a refrigerator in which the quick-freezing operation is automatically stopped upon completion of freezing of stored food, thereby preventing incomplete freezing of the food.

The content of the present invention will be specifically explained below using examples. In the first embodiment shown in FIGS. 1 to 3, reference numeral 1 denotes a heat-insulating box in which a freezer compartment 3 and a refrigerator compartment 4 are separated by a heat-insulating partition wall 2; is formed by a box-shaped freezer compartment cooler 5, and a refrigerator compartment cooler 6 is disposed within the refrigerator compartment 4. A drain port 7 is formed at the back of the bottom of the freezer compartment cooler 5, and water from defrosting flows from there through a drain pipe 8 provided in the partition wall 2 to a drain gutter 9 in the refrigerator compartment 4. It is now being accepted by the public, and is even being guided outside the warehouse. 10a is a door for the freezer compartment, and 10b is a door for the refrigerator compartment. Then the second
In the refrigeration cycle shown in the figure, compressor 1
The outlet portion 12 of the main capillary tube 14 is connected to the main capillary tube 14 via the condenser 13, and the outlet portion 1 of the main capillary tube 14 is
4a is a two-way solenoid valve 15 serving as a flow path switching device;
Auxiliary capillary tube 16, refrigerator cooler 6, connecting tube 17
and the compressor 11 via the freezer compartment cooler 5.
is connected to the suction port 18 of the main capillary tube 1.
The outlet section 14a of the freezer compartment cooler 5 is also connected to the inlet section of the freezer compartment cooler 5 via an auxiliary capillary tube 19 different from the above and a part of the connecting tube 17. Here, the flow path having one auxiliary capillary 16 forms a first refrigerant supply path 20 that supplies refrigerant in series to both the refrigerator compartment cooler 6 and the freezer compartment cooler 5, and the other auxiliary capillary 19 The flow path having the refrigerant serves as a second refrigerant supply path 21 that supplies refrigerant only to the freezer compartment cooler 5. Since the flow resistance of the auxiliary capillary tube 19 is set to be larger than the series flow path resistance of the other auxiliary capillary tubes 16 and the refrigerator compartment cooler 6, the liquefaction is liquefied in the condenser 13 as the compressor 11 operates.
The liquid refrigerant discharged from the outlet portion 14a of the main capillary tube 14 is supplied to the first refrigerant supply path 20 when the solenoid valve 15 is open;
is closed, the second refrigerant supply path 21
supplied to In the control circuit shown in FIG.
Reference numeral 22 designates an AC power source with bus bars 23 and 24 connected to both ends, 25 a compressor motor, 26 a temperature switch for the freezer compartment, and 27 a temperature switch for the refrigerator compartment. In this freezer compartment temperature switch 26, the movable contact piece c is connected to the bus bar 23, and each of the fixed contact pieces a and b is connected to the bus bar 24 via a compressor motor 25 and a heat-sensitive tube heater 28, respectively. . 29 is a quick freezing control circuit, which includes a quick freezing switch 30 that is turned on only during the pressing operation period, and a first relay 31 having normally open contacts 31a and 31b.
The second relay 32 has a normally open contact 32a and normally closed contacts 32b and 32c. In the connection, the temperature switch 26 for the freezer compartment
The fixed contact piece a is connected to the terminal 3 through the normally open contacts 31a and 32a in parallel, and then through the second relay 32.
3, and one end of the first relay 31 is connected to its own normally open contact 31b and the quick freezing switch 30.
The other end is connected to the terminal 33 via the normally closed contact 32c of the second relay 32, and this terminal 33 directly connects to the bus 24.
connected to. In the refrigerator temperature switch 27, the movable contact c is connected to the bus bar 23 via the normally closed contact 32b of the second relay 32, and the fixed contact a is connected to the bus bar 24 via the solenoid valve 15. ,
Further, the other fixed contact piece b is connected to the bus bar 24 through a connecting pipe heater 34 and a drain pipe heater 35 in parallel. The temperature switch 26 for the freezer compartment
The heat-sensitive part 26A of the switch 26 is located below the back of the freezer cooler 5, and the switch 26's contact piece c-a is set at the normal temperature (-18
It is designed to turn on (actuate to the compressor drive side) when the temperature is below 30°F (-22°C) and turn off when the temperature is -22°C. In addition, between contact pieces c and a of the temperature switch 27 for the refrigerator compartment, when the temperature inside the refrigerator is set to normal temperature,
It turns on when the refrigerator compartment cooler 6 is at (+3.5℃), and the air temperature near the refrigerator compartment cooler 6 is (-7.5℃).
is set to turn off. Further, the heat-sensitive tube heater 28 is connected to the temperature switch 2 for the freezer compartment.
Compressor 11 where contact piece c-b of 6 is turned on
The heat sensitive part 2 of the switch 26 is energized during the stop period of the switch 26.
This is to shorten the off cycle of the compressor by heating the 6A. Further, the connecting pipe heater 34 and the drain pipe heater 35 are energized during the period when the contacts c and b of the temperature switch 27 for the refrigerating room are turned on to heat the connecting pipe 17 and the drain pipe 8 to prevent frosting and freezing thereon. This is to make it work so that it does.

Next, the operation of the above configuration will be explained. In a normal cooling operation state in which the quick freezing switch 30 is not turned on, when both the freezing compartment 3 and the refrigerator compartment 4 are at or above the set temperature, the freezing compartment temperature switch 26 is turned on between contact pieces c and a. The compressor motor 25 is being driven, and the refrigerating room temperature switch 27 is on between contacts c and a, and the solenoid valve 15 is open. The refrigerant is supplied to the first refrigerant supply path 20 by the solenoid valve 15, and both the freezer compartment cooler 5 and the refrigerator compartment cooler 6 exhibit a cooling effect. When the air temperature near the refrigerator compartment cooler 6 drops below (-7.5°C), the refrigerator compartment temperature switch 27 is switched off between contacts c and a, and the solenoid valve 15 is cut off, so that the refrigerant The refrigerant is supplied only to the freezer compartment cooler 5 via the second refrigerant supply path 21, and cooling operation of the freezer compartment 3 is performed continuously. ), the temperature switch 26 for the freezer compartment returns to the compressor stop side, that is, the contact piece ca is turned off, and the temperature switch 26 is stopped.
Thereafter, when the temperature of the freezer compartment cooler 5 gradually rises and reaches (-18°C) or higher, the contact piece c and a of the freezer compartment temperature switch 26 are turned on, the compressor 11 is driven, and the freezer compartment 3, the temperature of the refrigerator compartment 4 gradually rises, and when the temperature of the refrigerator compartment cooler 6 reaches (+3.5°C) or higher, the contact piece c and a of the refrigerator compartment temperature switch 27 are turned on. Then, the solenoid valve 15 is opened and the refrigerator compartment 4 and the freezer compartment 3 are operated for cooling.

Next, the quick freezing operation will be explained. In this case, the quick freezing switch 30 is turned on. Then, the first relay 31 is energized by the series circuit of the quick freezing switch 30 and the normally closed contact 32c and turns on the normally open contacts 31a and 31b, so that from then on the normally open contact 31b maintains the self-holding state. become. When the normally open contact 31a of the first relay 31 is turned on, the second relay 32 is immediately activated via the normally open contact 31a if the contact pieces c and a of the freezer temperature switch 26 are turned on. If the contact pieces c and a of the switch 26 are turned off, the electricity will be turned on when the contact pieces c and a of the switch 26 are turned on, and the normally open contact 32a will turn on the temperature switch 26 for the freezer compartment.
Since the normally closed contact 32c is turned off, the first relay 31
When the self-holding is released and the normally closed contact 32b is turned off, the solenoid valve 15 is turned off regardless of the state of the refrigerator temperature switch 27.
is de-energized and kept closed. When the quick freezing switch 30 is turned on in this way, the compressor 11 is driven at the same time as this, or when the freezing room temperature switch 26 senses the on temperature of the freezing room cooler 5 for the first time thereafter. Accordingly, only the freezer compartment cooler 5 exhibits a cooling effect, and when its temperature falls below the set temperature, the contact piece c and a of the freezer compartment temperature switch 26 are turned off and the compressor 11 is stopped. At the same time the second relay 32
is released from self-holding, and the rapid freezing control circuit 29 is returned to an inactive state, that is, to a normal cooling operation state. As described above, in the operating state of the quick freezing control circuit 29 that the second relay 32 self-holds based on the ON operation of the quick freezing switch 30, the normally closed contact 32b of the second relay 32 disconnects the solenoid valve 15. Since the compressor 11 is driven while being kept in the electrically closed state, all of the refrigerant discharged from the main capillary tube 14 is transferred to the second refrigerant supply path 21.
As a result, the freezer compartment cooler 5 is provided with a more rapid cooling action than when receiving the refrigerant via the refrigerator compartment cooler 6, resulting in a so-called quick freezing action. demonstrate.

According to the above structure that operates as described above, when the quick freezing switch 30 is turned on while the compressor 11 is stopped and the temperature switch 26 for the freezer compartment is turned off between the contacts c and a, the first relay is turned on. 31 enters the self-holding state, the quick freezing operation in which refrigerant is supplied only to the freezer compartment cooler 5 from the start of operation of the compressor 11 does not start immediately, and the freezer compartment temperature switch 26 This means that the compressor 11 is started in an abnormally overloaded state because the refrigerant is started after the refrigerant distribution system has been turned on during -a, in other words, after the compressor 11 has stopped and the pressure relationship in the refrigerant distribution system has been balanced. It can definitely be prevented. Furthermore, for example, if a quick freezing operation is started by putting an ice tray filled with water into the freezer compartment 3, the temperature of the freezer compartment cooler 5 during the quick freezing operation will be determined by the change in the water temperature in the ice tray. The heat-sensitive portion 26A of the freezer temperature switch 26 does not reach the so-called OFF temperature, which is the OFF temperature between contact pieces c and a, before the water freezes, and reaches the OFF temperature only after the freezing is completed. In this way, the quick freezing operation is stopped only when the temperature switch 26 for the freezer compartment detects the completion of freezing of the stored food, and it is ensured that the quick freezing operation is stopped while the food is incompletely frozen. It is preventable.

Next, in the second embodiment shown in FIG. 4, in which the same parts as those in FIG. Electrical control is performed by the transfer contact 31c of the first relay 31 and the temperature switch 26 for the freezer compartment.

Fig. 5 shows the refrigeration cycle used in the third and fourth embodiments, Fig. 6 shows the control circuit of the third embodiment, and Fig. 7 shows the control circuit of the fourth embodiment. It is shown. In addition, the second part in Figures 5 to 7
The same parts as in FIGS. 4 to 4 are designated by the same reference numerals. The one shown in Fig. 6 is the normally closed contact 32 of Fig. 3.
b is replaced with a transfer contact 32d, and the temperature switch 36 for the refrigerator compartment is configured to be turned on when the temperature of the cooler 6 for the refrigerator compartment falls below the set temperature. Even in such a configuration, the second relay 3 is activated based on the ON operation of the quick freezing switch 30.
2 holds true, its transfer contact 32
Since d is switched from the b side to the a side and the electromagnetic valve 15 is energized in an open state, a quick freezing operation is performed.

The one shown in FIG. 7 is the same as the one shown in FIG. 6, but has a configuration in which the energization/disconnection control method of the heat-sensitive tube heater 28 is changed to the method shown in FIG. 4.

As described above, the present invention is designed to maintain the pressure relationship of the refrigerant distribution system in a balanced state even if the quick freezing operation is performed with the compressor stopped in a device with a quick freezing function that can rapidly cool the freezer compartment. The quick freezing operation can be automatically performed after the temperature is reached, and therefore, it is possible to prevent the compressor from starting under an abnormal overload condition due to the quick freezing operation. It is possible to provide a quick-freezing device for a refrigerator that automatically freezes food upon completion and can prevent incomplete freezing of food.

[Brief explanation of the drawing]

1 to 3 relate to the first embodiment of the present invention, in which FIG. 1 is a longitudinal sectional side view, FIG. 2 is a system diagram of a refrigeration cycle, and FIG. 3 is a wiring diagram of a control circuit. Figure 4 is a wiring diagram of the control circuit of the second embodiment, Figure 5 is a system diagram of the refrigeration cycle used in the third and fourth embodiments, and Figures 6 and 7 are the diagrams of the third and fourth embodiments, respectively. FIG. 2 is a wiring diagram of a control circuit of FIG. In the figure, 3 is a freezer compartment, 4 is a refrigerator compartment, 5 is a cooler for the freezer compartment, 6 is a cooler for the refrigerator compartment, 11 is a compressor, 13 is a condenser, 15 is a solenoid valve (flow path switching device), and 20 is a a first refrigerant supply path, 21 a second refrigerant supply path, 26 a temperature switch for the freezer compartment, 27
29 is a quick freezing control circuit, 30 is a quick freezing switch, 31 is a first relay, 32 is a second relay, and 36 is a refrigerator temperature switch.

Claims (1)

[Scope of utility model registration request] A compressor controlled by a temperature switch for the freezer compartment, a first refrigerant supply path that is controlled by the temperature switch for the refrigerator compartment and supplies refrigerant to both the freezer compartment cooler and the refrigerator compartment cooler, and the freezer compartment cooler. A quick freezing switch, a first relay that is self-held by the operation of the quick freezing switch, When the temperature switch for the freezer compartment operates to the compressor drive side in the self-holding state of the first relay, it is energized to release the self-holding of the first relay and switch the flow path switching device to the second refrigerant supply path. and a second relay that switches to a state where refrigerant is supplied to the refrigerator and then maintains this state until the temperature switch for the freezer compartment returns to the compressor stop side.