JPS61138073A - 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 is of a forced draft type and uses electrical input to regulate the amount of cold air into a refrigerated compartment and a third compartment that is cooled independently of the refrigerated compartment. The present invention relates to a refrigerator equipped with a damper opening/closing device.

Conventional configuration and its problems A conventional example will be explained with reference to FIGS. 7 to 812.

Reference numeral 1 denotes a refrigerator body, which is divided by a partition wall 2 into a freezing compartment 3 at the top and a refrigerating compartment 4 at the bottom. 6 is a semi-sealed f which is provided in a large part of the refrigerator compartment 4 and is cooled independently of the refrigerator compartment 4.
In the room a3, the partition wall 2 is used as a top plate, and the room is surrounded by a heat insulating material 6 and a heat insulating door 7, and is configured as an independent cold room mainly maintained at a lower temperature than the refrigerator room 4. 8 is a cooler for the refrigeration cycle, and 9 is a blower for forced ventilation. 1
Reference numeral 0 denotes a control panel installed at the entrance of the refrigerator compartment 40, which includes a damper opening/closing control device 11 (hereinafter referred to as the electric damper 11) for the refrigerator compartment that adjusts the amount of cold air flowing into the refrigerator compartment 4 according to electrical input. , a damper opening/closing device 12 for the third chamber (hereinafter referred to as electric damper 12) that adjusts the amount of cold air to the third chamber 5, a discharge passage 13 for discharging cold air to the refrigerator compartment 4, and a discharge port 14. , a discharge passage 16 for discharging cold air to the third chamber 5, and a discharge port 16. Reference numeral 17 denotes a ventilation duct which has one end opened on the discharge side of the blower 9a and the other end communicated with the control panel 10 provided at the entrance of the refrigerator compartment. The other side is configured to open facing the electric damper 11 for heavy use, and the other side opens to face the electric damper 12 for heavy use.

Next, the electric dampers 11 and 12 will be described in detail. 19.1σ is a solenoid, and 20.degree. 20' is a damper flap that is operated by the solenoid 19 to open and close the cold air passage. 21.21' is a damper case, with air passage sections 21a and 21a' at the top and a mechanical section 21 at the bottom.
b, forming 21 h/.

22 and 22' are rods that push up the damper flaps 20 and 20' in the opening direction;
21'17) The damper flap 20 partially passes through and communicates with the air passage parts 21a, 21a' and the mechanical parts 21b, 21b'jrC, and its tip is pivotally supported at the upper end of the air passage parts 21a, 21a'lC, It is in contact with a part of the lower surface of 2C/.

23.23 is a plunger connected to the rods 22, 22', which is inserted into the inner core of the solenoid 19, 19' housed in the mechanical parts 21b, 21b' and is movable up and down. Reference numerals 24 and 24' denote springs, which normally bias the plungers 23,2:i downward. Further, 26,2σ is a spring that biases the damper flap 20, 20' in the closing direction.

Reference numerals 26, 27, and 28 are suction ports for the freezer compartment, the refrigerator compartment, and the third compartment, which are opened in the partition wall 2, respectively.
It communicates with the lower end surface of the cooler 8 through a suction passage 30 for the freezer compartment, a suction passage 31 for the refrigerator compartment, and a suction passage 32 for the third room, which are formed of the heat insulating material 29 inside. 33,
34 and 35 are temperature detectors such as thermistors for detecting the temperatures in the freezer compartment, refrigerator compartment, and third room, respectively.

This is the configuration, and the air cooled by the cooler 8 is sent to the blower 9.
As a result, air is forced into the freezer compartment 3, and is also supplied to the refrigerator compartment 4 and third compartment 5 via electric dampers 11 and 12.

Next, the control circuit will be explained. Reference numeral 36 denotes a refrigeration cycle compressor, which is connected in parallel with the blower 9 and then connected to the power supply via a relay contact 37. Also, the solenoid of the electric damper 11 for the refrigerator compartment 19 is connected in series with the relay contact 38 and then connected to the power source, and the solenoid 1V of the third heavy duty electric damper 12 is connected in series with the relay contact 39 and then connected to the power source.

Reference numeral 40 denotes a freezer temperature control device, which includes a temperature detector 33 such as a thermistor, resistors R1, R2, R3, a comparator circuit including a comparator 41, a transistor 42, and a relay circuit 37.
', and the output of the comparator 41 is connected to the base of the transistor 420. Further, an attraction relay coil 37' for opening and closing the relay contact 37 is connected to the collector of the transistor 42. 43 is a damper opening/closing control device for the refrigerator compartment, which includes a temperature sensor 34 such as a thermistor for the refrigerator compartment, resistors R4, λ6 . R6, comparator 44, L transistor 45, relay coil 3d
The output of the comparator 44 is connected to the base of a transistor 45, and the collector of the transistor 46 is connected to an attraction coil 38' for opening and closing the relay contact 3B.

46 is a third important damper opening/closing control device, which includes a temperature sensor 35 such as a thermistor in the third chamber 6, resistors R7, R8,
R9, a comparator 47, a transistor 48, and a relay coil 3C/, and the comparator 47
The output of the transistor 48 is connected to the base of the transistor 48, and the collector of the transistor 48 is connected to an attraction relay coil 39' for opening and closing the relay contact 39.

In such a configuration, when the temperature of the freezing compartment 3 is higher than a predetermined value during normal operation, the resistance value R of the temperature sensor 33 of the freezing compartment 3 is
TH1 has become small, and the potential at point A determined by this resistance value RTH1 and resistor R1 becomes higher than the voltage at point B determined by resistors R2 and R3, and the output of comparator 41 becomes "H#". Therefore, the transistor 42 turns on and the relay coil 37' becomes conductive.Then, the relay contact 37 is closed, the compressor 36 and the transmitter 9 are operated, and the freezer compartment 3, refrigerator compartment 4, and third compartment 5 are operated. After that, when the freezing compartment 3 is cooled to a certain temperature, the resistance value RTH1 of the temperature sensor 33 of the freezing compartment 3 increases, and the A potential becomes smaller than the B potential, so the comparator 41 becomes "L". Generate a signal. For this reason, the transistor 42 is turned off, the power supply to the relay coil 37' is cut off, the relay contact 37 is opened, and the compressor 36 and the blower 9 are stopped.

On the other hand, regarding the temperature control of the refrigerator compartment 4, when the temperature of the refrigerator compartment 4 is higher than a predetermined value, the resistance value RTH2 of the temperature sensor 34 of the refrigerator compartment becomes small, and this resistance value RTH
2 and resistor R4 is the voltage at the 0 point determined by resistors R5 and R4.
Since the output of the comparator 44 becomes H'' at 9, which is higher than the voltage at point D determined in 6, the transistor 46 turns on.Then, the relay coil 39' becomes conductive and the relay contact 3
Solenoid 1 of electric damper 11 for the refrigerator compartment by closing 9
9 becomes electrically conductive, the damper flap 2o is opened, and cold air flows into the refrigerator compartment 4 to cool it. After that, cold room 4
If the temperature of the refrigerator compartment 4 is cooled down to a constant temperature, the resistance value RTH2 of the temperature sensor 34 of the refrigerator compartment 4 becomes large, and the C potential becomes smaller than the C potential, so the output of the comparator 44 becomes "
Ll, and the transistor 46 is turned off. Then, conduction to the relay coil 39' is cut off and the relay contact 39' is cut off.
Since this opens, conduction to the solenoid 19 is also cut off, and the damper flag 22 closes to prevent cold air from flowing into the refrigerator compartment 4.

In addition, regarding temperature control of the third chamber 6 during this period, if the temperature of the third chamber 5 is higher than a predetermined value, the resistance value RTH3 of the temperature detector 35 of both chambers becomes small. Since the potential at point E determined by resistance value RTHa and resistor R7 is higher than point F1Dt determined by resistors R8 and R9, the output of comparator 47 (7) becomes "H". Transistor 48 is turned on. and relay coil 40'
conducts and closes the relay contact 40, and the solenoid 19' of the electric damper 12 for both compartments becomes conductive, so the damper flag 20' is opened and cold air flows into the third chamber 6 to cool it. Thereafter, when the temperature of the third chamber 5 is cooled down to a constant temperature, the resistance value R of the temperature sensor 35 of the third chamber 5 increases.
Since TH3 increases and the E potential becomes smaller than the F potential, the output of the comparator 47 becomes "L" and the transistor 48 is turned off.

Then, the conduction to the relay coil 4'0' is cut off and the relay contact 4o is opened, so the conduction to the solenoid 19' is also cut off, the damper flap 20' is closed, and the cold air flows into the third chamber 5. prevent the influx of In this way, refrigerator compartment 4,
The temperature control of the third chamber 6 is not affected by the temperature control function of the freezing chamber 3, and this function is repeated after 0, at which each independent control is performed, to perform a normal cooling function.

However, when both the compressor 3e and the blower 9 are controlled to start and stop depending only on the freezer temperature control device 40, the temperature in the refrigerator compartment 4 and the third compartment 6 rises during busy periods. Even if cold air needs to be supplied, the refrigerating compartment 4 and the third compartment 5 will not be cooled unless the temperature sensor 33 of the freezing compartment 3 reaches a predetermined temperature or higher. In this case, the temperature range (for example, -
As for the third chamber 6, which is maintained at a temperature of 3 to 0 degrees Celsius and is used to store fresh foods such as fish and meat for a relatively long period of time, the fresh foods that are stored therein are susceptible to temperature rises, and the effects of this are is huge.

For example, if the third chamber 6 is frequently used while the compressor 36 and blower 9 are stopped, or if food is put in, the indoor temperature will rise considerably and the temperature detector 36 will be at a predetermined temperature or higher. When rising, the electric damper~12 damper flaps 20
' is opened, but if the freezer compartment 3 is hardly used at that time and the temperature sensor 33 of the freezer compartment 3 has not reached the predetermined temperature, both the compressor 36 and the blower 9 will not be operated and the third compartment 5 will be opened. Since no cold air is supplied to the room, the room temperature rises even further, causing damage to the fresh food being stored, which is a major practical problem.

OBJECTS OF THE INVENTION In view of the above points, the present invention aims to prevent the temperature rise in the third chamber while the compressor is stopped.

Structure of the Invention In order to achieve this object, the present invention operates a forced ventilation fan when the temperature in the third room is above a predetermined temperature even when the compressor is stopped, and The damper flap of the damper opening/closing device for the refrigerator compartment is forcibly opened by electrical control, and at the same time, the damper flap of the damper opening/closing device for the refrigerator compartment is forcibly closed, thereby supplying cold air intensively to the third room. This is to prevent temperature rise.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 6. In addition, the same reference numerals are given to the same configurations as in the past, and detailed explanation thereof is omitted. 036 is a compressor of the refrigeration cycle, and after being connected in series with the relay contact 49,
Connected to both ends of the power supply. Reference numeral 9 denotes a blower for forced ventilation, which is connected in series with the relay contact 6o and then connected to both ends of the power source. 19 is a solenoid for the electric damper 11 for the refrigerator compartment, connected in series with the relay contact 38, and 1g' is a solenoid for the electric damper 12 for the third compartment, connected in series with the relay contact 39, respectively. A temperature control device for a 0-40-meter freezer that is connected to both ends of the power supply, includes a temperature detector 33 such as a thermistor, resistors R, R2, R3, a comparator circuit equipped with a comparator 41, a transistor 42, and a relay coil 49.
', and the output of the comparator 41 is connected to the base of the transistor 42 and to one input of the OR circuit 51, and also to the AN via the inverter 52.
It is also connected to one input of the D circuit 63. A suction relay coil 4G/ for opening and closing a relay contact/point 49 is connected to the collector of the transistor 42.

43' is a refrigerator temperature control device, which includes a temperature detector 24 such as a thermistor, resistors R4, R5, R6, a comparator circuit including a comparator 44, a transistor 45, and a relay coil 38.
' and an AND circuit 54, the comparator 4
The output of A 4 is connected to one input of the AND circuit 64, and the output of A
The output of the ND circuit 64 is connected to the pace of the transistor 45, and the collector of the transistor 45 is connected to a suction relay coil 38' for opening and closing the relay contact 38.

4d is a third room temperature control device, which includes a temperature detector 36 such as a thermistor, resistors R7, R8, R9, a comparator circuit including a comparator 47, a transistor 48, a relay coil 3V, the OR circuit 51, and a transistor 65. , and a relay coil 50', the output of the comparator 47 is connected to the pace of a transistor 48, and the collector of the transistor 48 is connected to a suction relay coil 3V that opens and closes the relay contact 39. , the output of the comparator 47 is also connected to one input of the OR circuit 51,
The output of OR circuit 61 is connected to the base of transistor 65. A suction relay coil 5σ that opens and closes the relay contact 5o is connected to the collector of the transistor 56. Furthermore, the output of the comparator 47 is the AND
It is connected to one input of the circuit 53, and the output of the AND circuit 53 is connected to one input of the AND circuit 64 via an inverter 66.

Next, the operational status of this configuration will be explained.

When the temperature of the freezing compartment 3 during normal operation is higher than a predetermined value, the resistance value RTH1 of the temperature sensor 33 of the freezing compartment is small, and the potential at point A determined by this resistance value RTH1 and the resistance R1 is , becomes higher than the potential at point B determined by resistors R2 and R3, and the output of the comparator 41 becomes 'H', so the transistor 42 is turned on and the relay coil 49' becomes conductive.Then, the relay contact 49 is closed. The compressor 36 starts operating, and the cooler 8 performs a cooling action.At the same time, the O
Since one input of the R circuit 61 becomes I Hjl, the output of the OR circuit 61 also becomes "H", turning on the transistor 66 and making the relay coil so' conductive. and relay contact 6
0 is closed, the blower 9 is operated, and the air cooled by the cooler 8 is supplied to the freezer compartment 3, the refrigerator compartment 4, and the third compartment 6 for cooling. At this time, the temperature of the refrigerator compartment 4 is controlled. Regarding, when the temperature of the refrigerator compartment 4 is higher than the predetermined value, the resistance value RTH2 of the temperature sensor 34 of the refrigerator compartment is small, and this resistance value RTH
2 and resistor R4 is the potential of the 0 point determined by resistor R5,
As the potential at point D determined by R6 rises, the output of the one-parator 44 becomes "H" and one input of the AND circuit 64 becomes "H". On the other hand, at this time, the temperature of the freezer compartment 3 is higher than the predetermined temperature, and the comparator 41 of the freezer compartment temperature control device 40'
When the output of is "H#", it is converted by the inverter 52 and one input of the AND circuit 53 becomes a L ml, so the output of the AND circuit 53 becomes "L" regardless of the other input, and the inverter 56 The output of the AND circuit 54 becomes N% H#, and the transistor 45 turns on.Then, the relay coil 38' becomes conductive. The electric damper 1 for the refrigerator compartment is closed by closing the relay contact 38.
The solenoid 19 of No. 1 is energized. When the solenoid 19 is energized, the plunger 23 inserted into the inner core pushes up the electromagnetic rod 22 and opens the damper flap 2o in contact with it to form a cold air passage 21a, thereby opening the cooler. The air cooled by 8 is supplied to the inside of the refrigerator compartment 4 by a forced draft blower 9 for cooling.

On the other hand, regarding the temperature adjustment of the third chamber 6, the third chamber 5
is higher than the predetermined value, the resistance value RTHs of the temperature sensor 36 in the third chamber is small, and the potential at point E determined by this resistance value RTHs and the resistor R7 is the same as that of the resistor R8, R9 becomes higher than the potential at point F determined by R9, and the output of the comparator 47 becomes "R2", and the transistor 48
turns on.

Then, the relay coil 39' conducts, the relay contact 39 closes, and the solenoid 1C of the third dual-purpose electric damper 12
j is energized. When the solenoid 19' is energized, the plunger 23 inserted inside the solenoid is pushed up to one side by electromagnetic action, compressing the spring 24, pushing up the rod 22, and opening the damper flap 2o in contact with it. to form a cold air passage section 216', whereby the air cooled by the cooler 8 is passed through the third blower 9 for forced ventilation.
is supplied to the inside of the chamber 6 for cooling.

After that, when the freezing compartment 3 is cooled to a certain temperature, the resistance value RTH1 of the temperature sensor 33 of the freezing compartment becomes large, and the A potential becomes smaller than the C potential, so the comparator 41 becomes "
Generates an L'' signal. Therefore, the transistor 42 is turned off.
Then, conduction to the relay coil 49' is cut off, the relay contact 49 is opened, and the compressor 36 is stopped. At the same time, the "'L" signal is also input to one input of the OR circuit 61.

Additionally, if the temperature of the refrigerator compartment 4 has been cooled to a constant temperature during this period, the resistance RTH2 of the temperature sensor 34 of the refrigerator compartment 4 will increase, and the C potential will become smaller than the C potential, so the output of the comparator 44 will be " Since one input of the AND circuit 54 becomes "L'", the output of the AND circuit 54 becomes "Ll" and the transistor 45 is turned off.Then, the conduction of the relay coil 38' is turned off. The relay contact 38 is opened, and the energization to the solenoid 19 of the electric damper 11 for the refrigerator compartment is also stopped.When the energization to the solenoid 19 is stopped, the plunger 23
The force pushing up the plunger 23 is eliminated, and the plunger 23 falls downward together with the restoring action of the spring 24, and the rod 22 is also pulled down. When the rod 22 is no longer pushed up, the damper flap 2° is pulled down together with the tensile action of the spring 26, and the cold air passage 21a is closed.

On the other hand, if the temperature of the third chamber 6 has been cooled to a constant temperature during this period, the resistance value RT of the temperature sensor 36 of the third chamber 5
When H3 becomes large and the E potential becomes smaller than the F potential, the output of the comparator 47 becomes 'L' and the transistor 48 is disconnected from the 0FFL relay coil 39'.Then, the relay contact 39 is opened and the third dual-purpose The power supply to the solenoid 21' of the electric damper 12 is stopped◇
When the energization to the solenoid 21' is stopped, the force pushing the plunger 23 upward is eliminated, and the plunger 23
The rod 22 falls downward together with the restoring action of the spring 14, and the rod 22 is also pulled down. When the rod 22 is no longer pushed up, the damper flap 20' is pulled down together with the tensile action of the spring 25, and the cold air passage 21a' is closed. In this way, the freezer compartment 3, the refrigerator compartment 4, and the third compartment S
The supply of cold air is stopped, and this operation is repeated thereafter to perform the normal cooling operation.

On the other hand, the freezer compartment 3 is cooled to a predetermined temperature and the compressor 3
When the temperature of the third chamber 5 rises above a predetermined temperature while the third chamber 6 is stopped, and it is necessary to cool the third chamber 6, the resistance RTH3 of the temperature sensor 35 is small and reaches the point E. Since the potential at point F is greater than the potential at point F, the output of the comparator 47 becomes "H"', the transistor 48 turns on, the relay coil 39' also conducts, the relay contact 39 closes, and the solenoid of the electric damper 12 19' is energized and the damper flap 20' is opened.

On the other hand, the output ``H'' of comparator 4a is output from OR circuit 51.
Therefore, even if the other input from the comparator 41 of the freezer room temperature control device 4σ is "L", the output of the OR circuit 51 is
Then, the relay contact 6Q is closed and the blower 9 is connected to the compressor 36.
is operated even when it is stopped.

Also, at this time, the input of the AND circuit 53 is the "L" signal inverter 52 of the comparator 41 of the freezer room temperature control device 40'.
and the "H" signal from the comparator 47 of the third room temperature control device 4d.
The output of the AND circuit 63 becomes "H". Therefore, it is converted by the inverter 56 and one input of the AND circuit 64 becomes L#. Therefore, the output of the AND circuit 64 becomes L'', the transistor 46 turns OFF L, and the relay coil 38'
The relay contact is opened on the 3rd day, the electricity supply to the solenoid 19 of the electric damper 11 for the refrigerator compartment is stopped, and the damper flap 2o is forcibly closed.

Therefore, even when the compressor 36 is stopped, the cooler 8, which maintains a temperature sufficiently lower than the temperature of the third chamber 5, is in the freezer compartment 3.
Cold air around the refrigerator compartment 4 is circulated by the blower 9, but at this time, the damper flap 20 of the electric damper 11 for the refrigerator compartment is forcibly closed, so it does not flow into the refrigerator compartment 4, and the cold air does not flow into the refrigerator compartment 4. It is intensively supplied into the third chamber 5 through the damper flap 20' of the dual-purpose electric damper 12, exhibiting a rapid cooling effect and preventing the temperature of the third chamber 6 from rising. Also, the temperature of the freezing compartment 3 rises slightly during this period due to convective heat exchange with the third compartment 5, but when the temperature detector 33 of the freezing compartment detects a predetermined temperature, the compressor 36 restarts operation. Since the normal cooling effect is performed, the temperature of the freezer compartment 3 will not rise above normal.

Effects of the Invention As is clear from the above explanation, the present invention employs a forced ventilation system, and includes a freezer compartment, a refrigerator compartment, and a third compartment that is cooled independently of both compartments; Two damper opening/closing devices are installed at the entrance of the chamber to adjust the amount of cold air flowing in by electrical input, and when the temperature of the third chamber is above a predetermined temperature, a blower for forced ventilation is operated even when the compressor is stopped. At the same time, the damper 7 of the third dual-purpose damper opening/closing device is forcibly opened, and the damper flap of the damper opening/closing device for the refrigerator compartment is forcibly closed. Therefore, even if the third chamber is used frequently or there is a risk that the temperature in the third chamber will rise significantly due to an increase in food load, the cooler or freezer can be turned off while the compressor is stopped. Since the low-temperature cold air around the room is intensively circulated and supplied only to the third room, the third room can be quickly cooled down in a short period of time and a temperature rise can be prevented. Temperature range (e.g. -3 to 0°C) lower than temperature (3 to 10°C)
If the third chamber is used for the purpose of preserving fresh foods such as fish and meat for a relatively long period of time without losing their freshness by maintaining the temperature at Therefore, the utility of the present invention is extremely high and useful.

[Brief explanation of drawings]

FIG. 1 is a control circuit diagram of a refrigerator showing an example of an actual ship according to the present invention;
FIG. 2 is a cross-sectional view of a damper opening/closing device for a refrigerating compartment used in a refrigerator showing an embodiment of the present invention, and FIG. 3 is a cross-sectional view of a third dual-purpose damper opening/closing control device similar to FIG. 2. , FIG. 4 is a sectional view taken along line A-A of a refrigerator showing an embodiment of the present invention, FIG. 5 is a sectional view of a refrigerator showing an embodiment of the present invention, and FIG. 6 is a temperature control device of FIG. 5. 7 is a control circuit diagram of a conventional refrigerator, FIG. 8 is a sectional view of a damper opening/closing device for a refrigerator compartment used in a refrigerator, and FIG. 9 is a diagram of a conventional refrigerator. 10 is a cross-sectional view of a damper opening/closing device for both compartments similar to that shown in FIG.
11 is a sectional view of a refrigerator showing a conventional example, and FIG. 12 is another sectional view of the temperature control device portion of FIG. 11. 2...Division wall, 3...Freezing room, 4...
...Refrigerating room, 6...Third room, 8...
...Cooler, 9...Blower, 11 Damper opening/closing device for the refrigerator compartment, 12...Damper opening/closing device on the third chamber side, 2o...For the refrigerator room Diaper flap of damper opening/closing device, 20/- Damper flap of third room side damper opening/closing device. 36... Compressor. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 3 Figure 4 Figure 7 2.5' Figure 5 Figure 8 Figure 9 Figure 10 Figure 11

Claims (1)

[Claims] A freezer compartment, a refrigerator compartment that is partitioned by a partition wall, a third compartment that is cooled independently of both of these compartments, a compressor whose operation and stop are controlled depending on the temperature of the freezer compartment, and a A blower that is operated synchronously to circulate the air cooled by the cooler to the freezer compartment, the refrigerator compartment, and the third compartment; and an electric input that individually controls the amount of cold air to the refrigerator compartment and the third compartment. When the third chamber is at a predetermined temperature or higher, the blower is operated even when the compressor is stopped, and the damper opening and closing device for the third chamber is operated. A refrigerator configured so that only a damper flap is forcibly opened, and a damper flap of a damper opening/closing device for a refrigerator compartment is forcibly closed.