JPS6014078A - 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 forced draft type refrigerator-freezer that performs rapid freezing by continuously operating a compressor, and particularly relates to a defrosting device thereof. Conventionally, as shown in Fig. 1, in forced-air refrigerators in which air cooled by a main cooler 1 is circulated through a freezer compartment 3 and a refrigerator compartment 4 by a blower 2, the compressor 5 is operated continuously. It is known that rapid freezing can be performed by In particular, a case will be described in which a quick freezing compartment 7 is formed within the freezing compartment 3 and is separately provided with a direct cooling type auxiliary cooler 6 to perform quick freezing. In this case, as shown in Fig. 2, the refrigeration cycle is compressor 5 → condenser 8 → first refrigerant flow control valve 9 → first capillary tube 10 → main cooler 1 → compressor 5. During rapid freezing, it is common that the flow is compressor 5 → condenser 8 → second flow path 1] control valve 11 → second capillary tube 12 → auxiliary cooler 6 → main cooler 1 → compressor 6. The target 013 is a timer that integrates the operating time of the compressor 5. Specifically, pulses of the same pulse (for example, 601-IZ) are input to an electronic counter, integrated, and after a predetermined time ( For example, the defrosting command is output at 9 hours).

In such a configuration, during rapid freezing, the compressor 6 is operated continuously at high temperature for a certain period of time regardless of the internal temperature, so the main cooler 1 is kept at an extremely low temperature compared to during normal cycle operation. Frost buildup on the main cooler 1 increases. However, in the past, the pulse speed was kept constant during both normal cycle operation and rapid freezing, which had the disadvantage that when rapid freezing operation entered the integration cycle of the timer, frost formation increased and proper defrosting could not be performed. Was.

Purpose of the Invention Therefore, the present invention aims to optimize defrosting when rapid freezing is used.

Structure of the Invention In order to achieve this object, the present invention makes the second pulse speed input to the timer faster than the first pulse speed during quick freezing. This allows for earlier defrosting and appropriate defrosting.

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

In the figure, reference numeral 14 denotes a refrigerator body, which is divided by a partition wall 16 into a freezer compartment 3 at the top and a refrigerator compartment 4 at the bottom.

A quick freezing chamber 7 is provided within the freezing chamber 3 and is equipped with an auxiliary cooler 6 of direct cooling type. Further, a damper thermostat 16 is provided at the entrance of the refrigerator compartment 4 to adjust the amount of cold air flowing in.

A main cooler 1 of the refrigeration cycle is built in the partition wall 16, and the generated cold air is sent to the freezer compartment 3 by a blower 2.
, and the damper thermostat 16 to force ventilation into the refrigerator compartment 4.

The refrigeration cycle is the same as the conventional example shown in Fig. 2, and during normal cycle operation, the cycle is compressor 6 → condenser 8 → first refrigerant flow control valve 9 → first capillary 10 → main cooler 1
→ Compressor 5, and during rapid freezing, compressor 6 → Condenser 8 → Second refrigerant flow control valve 11 → Second capillary 12 → Auxiliary cooler 6 → Main cooler 1 → Compressor 5 It is composed of

Next, the electric circuits of the rapid freezing apparatus of the present invention will be explained.

The compressor 6 is connected to the freezer compartment thermostat 18 and the normal cycle operation - quick freezing changeover switch 19 and the normal cycle operation.
The blower 2 is connected to a power source 17 via a defrosting switch 2o, and is connected in parallel to the compressor 5 via a refrigerator door switch 21 that switches between the blower 2 and the interior light 23. The defrosting heater 22 is connected in parallel with the compressor 6 via the normal cycle operation/defrosting switch 2o, and the first refrigerant flow control valve 9 is connected in series with the relay 24. connected in parallel to the power supply. The refrigerant flow control valve 9 opens to form a normal flow path when the coil is conductive, and closes to allow the refrigerant to flow into the rapid freezing flow path when it is not conductive. The second refrigerant flow control valve 11 is a relay 25
connected in series with the power supply, and then connected in parallel with the power supply.

The refrigerant flow control valve 11 opens to form a rapid freezing flow path when the coil is conductive, and closes to allow the refrigerant to flow through the normal flow path when the coil is not conductive.

Here, the relay 24 is configured to close its contacts when the excitation coil is not energized, and the relay 25 is configured to close its contacts when the excitation coil is energized.

Next, regarding the control device, reference numeral 26 is a first pulse generator which generates a pulse when the compressor 5 is turned on.
is the second pulse generator, and the quick freezing switch 3o is turned on.
Then, pulses are generated, and each pulse is generated at a constant period, and the pulse speed is configured such that the second pulse is faster. A defrosting timer 28 is connected to the first pulse generator 26 and the second pulse generator 27 via a changeover switch 29 that switches between the first pulse generator 26 and the second pulse generator 27. , counts the number of pulses from both generators 26,27. When a predetermined number of pulses is counted up, a signal is sent to the normal cycle operation/defrosting switch 20. 30 is a quick freezing switch, a normal cycle operation-quick freezing changeover switch 19, relays 24, 25,
Furthermore, the first pulse generator 26-second pulse generator-7,
0 configured to send a signal to the changeover switch 29
Next, we will explain the operating conditions in this configuration.0 During normal cycle operation, the normal cycle operation-quick freezing selector switch 19 is connected to the contact 19a, and when the freezer compartment temperature is higher than a predetermined value, the freezer compartment thermostat 18 is turned on. Turns on and compressor i operates. At this time, since the quick freezing switch 30 is OFF, the contact of the relay 24 is ON, and the first refrigerant flow control valve 9 is therefore opened. At the same time relay 26
The contact point is turned OFF, so the second refrigerant flow control valve 11 is closed, and the refrigerant flow path is connected to the compressor 5 - condenser 8 - first refrigerant flow control valve 9 - first capillary 10 - main Cooler 1-Compressor 6
A circulation cycle is configured to perform cooling. Further, the normal cycle operation/defrosting switch 20 is connected to the contact 20 a, and the blower 2 is connected via the refrigerator compartment door switch 21.
is turned on. After that, when the inside of the refrigerator is cooled to a certain temperature, the freezer compartment thermostat 18 is turned off, and the compressor 5 is turned off.
, the blower 2 is turned off. Thereafter, this action is repeated to perform a normal cooling action. The first pulse generator/second pulse generator selector switch 29 is connected to the contact 29a, and the defrosting timer 28 integrates the low-speed first pulse generator, and when a certain number of counts is reached, normal cycle operation is started.
A signal is sent to switch the defrosting switch 20 to contact 2Qb, and the defrosting heater 22 is energized.

Next, when performing quick freezing, when the quick freezing switch 3o is arbitrarily turned on, the contact point of the normal cycle operation/quick freezing changeover switch 19 is switched to 19b, and the compressor 5 is continuously operated. At this time, the contact point of the relay 24 is 0FFI, so the first refrigerant flow control valve 9 is closed. At the same time, the contacts of the relay 26 are oiqed, and therefore the second refrigerant flow control valve 1
1 is left open, and the refrigerant flow path is compressor 5 - condenser 8 - second refrigerant flow control valve 11 - second capillary tube 12 - auxiliary cooler 6 -
The flow path is switched from the main cooler 1 to the compressor 5. At this time, by turning on the quick freezing switch 30, the contact point of the changeover switch 29 between the first pulse generator and the second pulse generator is switched to 29b, and the defrost timer 28 outputs the high-speed second pulse. Accumulate. When the defrosting timer 28 counts a certain number of pulses, it sends a signal to energize the defrosting heater 22, but since the second pulse speed is faster than the first pulse speed, the period when the quick freezing switch is turned on is The defrosting cycle is shorter than when rapid freezing operation is not performed frequently.
It is possible to prevent excessive frost formation and perform appropriate defrosting.

Effects of the Invention As is clear from the above explanation, the present invention comprises a compressor that operates and stops depending on the temperature inside the refrigerator, a quick freezing switch that causes the compressor to operate continuously and performs quick freezing, and a quick freezing switch that operates the compressor continuously and performs quick freezing. A defrosting timer that receives a first pulse during operation time and outputs a defrosting command after a predetermined time, and a second pulse that is faster than the first pulse during rapid freezing is input to the timer. Since it is equipped with a switching device, when rapid freezing is used, the defrosting cycle is shortened as a result, and excessive frost formation can be avoided and proper defrosting can be performed.

[Brief explanation of the drawing]

Fig. 1 is a schematic sectional view of a conventional refrigerator, Fig. 2 is a piping diagram of its refrigeration cycle, Fig. 3 is a schematic sectional view corresponding to Fig. 1 of the present invention, and Fig. 4 is its electric circuit diagram. . 14... Refrigerator, 1... Main cooler, 3
...Freezer room, 4...Refrigerator room, 5...
... Compressor, 30 ... Rapid freezing switch, 2
6...First no(rus generator), 27...
・Second pulse generator, 28...Timer, 2
9.... Changeover switch (switching device). Name of agent: Patent attorney Toshio Nakao and 1 other person Raft 1
Figure 2

Claims (1)

[Claims] The air cooled by the main cooler installed in the cooling room is circulated by a blower to the freezer and refrigerator compartments, and a compressor is operated and stopped depending on the temperature inside the refrigerator, and this compressor is operated continuously.
A quick freezing switch that performs quick freezing, a timer for removing the register that receives a first pulse during the operating time of the compressor and outputs a defrosting command after a predetermined time, and a timer that outputs a defrosting command after a predetermined time; a switching device for inputting a faster second pulse to the timer.