JPS61265472A - 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 refrigerator capable of saving power in various refrigerators such as display refrigerated cases in food stores and vending machines.

``Conventional Technology'' Research into energy-saving measures for electrical equipment is being actively conducted in order to reduce power costs and make effective use of limited resources. Among them, refrigerators, which are one type of electric heat exchanger, are inefficient due to thermodynamic limitations and consume a large amount of power, so there is a strong demand for the development of effective power saving methods.

Conventionally, power savings in this type of refrigerator have been achieved by structurally improving the compressor of the refrigeration system and the motor that drives the compressor.

"Problems to be Solved by the Invention" However, the above-mentioned conventional power saving method for refrigerators has almost reached a state of technical perfection.

It was extremely difficult to expect further significant power savings.

The present invention has been made in view of the drawbacks of the prior art, and it is an object of the present invention to provide a refrigerator that can save power with a simple configuration.

"Means for Solving the Problems" The configuration of the present invention in accordance with the above object is provided in a refrigerator equipped with a refrigeration device for freezing an object to be frozen, and a blower device for circulating gas inside the object to be frozen. The gist of the present invention is that the air blower is equipped with a circulation amount wJ device that varies the circulation amount.

In short, the present invention reduces the amount of gas circulation to reduce the heat exchange rate, since the amount of gas circulating in the object to be frozen affects the heat exchange rate between the object to be frozen and the outside. It is characterized by suppressing the increase in electricity consumption and achieving effective power saving.

"Embodiments" Next, preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a circuit diagram showing a vending machine according to an embodiment of the present invention.

The main body 10 of the vending machine includes a freezer compartment 14 for storing a large number of canned juices 12, a product supply mechanism 18 for supplying canned juices 12 from the freezer compartment 14 to a product outlet 16 as needed, and a freezing device. Compressor (compressor)
20, an electric motor 22 for driving this compression a20, a fan motor 24 for circulating the air in the freezer compartment 14. It is equipped with fluorescent lighting and a microcomputer system. In the freezer compartment 14, an evaporator 28, which is part of the refrigeration system, is located opposite a fan 48 attached to a fan motor 24.
is provided.

Further, a thermostat (temperature switch) 2B as an example of a temperature sensor is provided at the lower part of the freezer compartment 14, and the operation of the electric motor 22 is controlled in conjunction with switch operation accompanying temperature changes. It has become.

Electric motor 22, fan motor 24, and other fluorescent lights.

The microcomputer system, the drive device of the product supply mechanism 18, etc. form the electrical load 3B of the vending machine.

In FIG. 1, this electrical load 38 is connected to the main power switch 32. The fuse 34 and the phase control circuit 36, which is an example of a circulation rate adjustment TI device, are connected in series, thereby forming a main circuit.

The phase control circuit 38 consists of a triac 40 inserted into the main circuit and a trigger circuit 42 for turning on the triac 40 at a predetermined phase angle. A phase control adjustment circuit 60 for switching between two normal phase angles is connected.

The trigger circuit 42 includes a capacitor C1 with one terminal connected to the Tl side of the triac 40, and four diodes 01 connected in a predetermined direction to both ends of the capacitor C1.
~'I] 4, Dl, 02, 02, port 39, and a resistor connected between each connection point of port 3 and D4 and the T2 side of the triac 40.

It consists of resistors R1 to R5 and an SBS inserted between the other terminal of C1, that is, the connection point of D2 and D3, and the gate terminal G of the triac 40.

This trigger circuit 42 operates from C1 to R2, R3, and R during a half-wave period when the Tl side of the triac 40 is positive and the T2 side is negative.
Current flows from R4, R2, R3 to at during the half-wave period when Tl side is negative and τ2 is positive. After a predetermined charging time, the SBS is switched and a negative or positive trigger pulse is applied to the G terminal of the triac 40.

When a trigger pulse is input from the trigger circuit 42, the triac 4G becomes conductive, and then the 1. The current flowing between T2 remains in a conductive state until it becomes zero. The period from when the power supply voltage becomes zero until the triac 40 becomes conductive after receiving a trigger pulse is called the phase angle. This phase angle is determined by the variable resistor R3. In this embodiment, for example, the AClooV voltage (line voltage) input from the plug 30 is reduced to 85V and supplied to the electrical load 38 without shorting both ends of the resistors R2 and R3. is set to the value. The phase angle at this time is hereinafter referred to as the normal phase angle.

On the other hand, R4 is much smaller than R2 and R3,
When both ends of resistors R2 and R3 are short-circuited, the phase angle is set to be the minimum phase angle close to zero, and in this case,
The input voltage ACIOQV is applied to the load 38 almost as is.

In addition, by appropriately changing the value of R4, instead of the minimum phase angle, it is also possible to set the phase angle such that the voltage applied to the load when both ends of R2 and R3 are short-circuited is, for example, 90V.

D1 to D4 in the trigger circuit 42. R1 and R5 are for reducing hysteresis.

A choke coil L1 is connected in series in the main circuit on the 1st terminal side of the triac 40.
, ) A capacitor C2 is connected in parallel with the liac 40. This Ll, 02 forms a low-pass LC filter, and together with the choke coil L2 connected in series in the main circuit on the T2 terminal side of the triac 40, it is used to suppress high frequency noise generated when the triac 40 is turned on. It is. C3. inserted in parallel to the triac 40. Re is a snubber circuit for improving turn-on and turn-off of the triac 40.

A choke coil L2 is inserted between the triac 40 of the main circuit and the electrical load 38. This is to suppress rapid current changes that occur when the triac 40 is turned on and off, and to reduce noise.

The electrical load 38 includes an electric motor 22, a fan motor 24,
Other loads 50, thermostat 26 and relay coil 44
are installed in parallel. When the thermostat 26 reaches a predetermined upper limit temperature, it closes the circuit and energizes the relay coil 44. A contact switch 46 that closes the contacts by excitation of the relay coil 44 is inserted in series with the electric motor 22, and the operation of the electric motor @22 is started, the compression @20 is driven, and the freezer compartment 14 is frozen.

Conversely, when the thermostat 2B reaches a predetermined lower limit temperature, it opens the circuit, demagnetizes the relay coil 44, and closes the contact switch 4.
In this embodiment, the fan motor 24, which opens B and stops the operation of the electric motor 22, is always rotated.

Normally, a voltage lower than the voltage toov is applied to the electrical load 38 by the phase control circuit 38.

The fan motor 24 is a fan 48 whose load requires a torque proportional to the square of the speed, so in the case of a 100V fan motor 24, tooV! When the applied voltage decreases compared to the time of U-turn, the number of revolutions decreases, and the amount of air circulated in the freezer compartment 14 decreases.

The fan motor 24 has a function of circulating cold air into the freezer compartment 14 to maintain a uniform temperature in the room, and a function of blowing air to the evaporator 28 to increase the heat absorption efficiency (cooling efficiency) of the evaporator 28. There is.

Even if the amount of air circulation decreases, as long as there is a certain amount of circulation, the temperature inside the freezer compartment 14 will be maintained at an almost uniform constant temperature. Since the airflow velocity inside the freezer compartment 14 along the partition wall 14A between the freezer compartment 14 and the outside air becomes smaller, the heat exchange effect occurring between the freezer compartment 14 and the outside air becomes weaker, and cold heat escapes from the freezer compartment 14, i.e. The temperature rise in the freezer compartment 14 is suppressed.

Therefore, once the inside of the freezer compartment 14 is frozen to a certain temperature and the thermostat 26 is turned off, there is little heat entering from the outside, so the temperature of the freezer compartment 14 rises to the upper limit temperature at which the thermostat 2B is turned on next time. This takes a long time, and therefore the thermal load is equivalently reduced, so the amount of power consumption required for freezing the freezer compartment 14 is reduced, which makes it possible to save power by several tens of percent. This power saving amount can be varied by changing the rotational speed of the fan motor 24, for example by changing the applied voltage. Specifically, the resistance value of R3 in the trigger circuit 42 described above may be changed.

Note that when the amount of air circulation decreases, the heat absorption efficiency of the evaporator 28 decreases slightly, but the above-mentioned effect of suppressing the escape of cold heat to the outside air is much greater, so the power consumption as a whole can be reduced. However, in this embodiment, as will be described later, the temperature is large while the refrigeration system is in operation.

A high heat absorption efficiency by the evaporator 28 can be ensured by ensuring a sufficient amount of air circulation.

The electric motor 22 has constant rotation characteristics with little change in rotation speed even if the applied voltage changes, and the compression 920 has constant load torque characteristics in which the load torque is almost constant even if the rotation speed changes. Normally, the 100V electric motor 22 for driving the compressor 20 can operate normally even at an operating point where the applied voltage is about 85 to 80V, and even if the applied voltage increases, there is little change in rotation speed and the cooling source The force remains almost the same, therefore 10
Separately from the reduction of the thermal load, power can be saved by the voltage drop from 0V.

However, the starting torque of the electric motor 48 is small, and conversely, the starting load torque of the compressor 4B, such as a reciprocating type, is large. Therefore, when the contact switch 4B closes and the motor starts, the voltage applied to the motor 5 is 85V. Due to lack of effective power, a rotation lock phenomenon occurs due to the balance between rotational torque and load torque, and there is a possibility that the device will not start smoothly or will be difficult to start.

In this embodiment, when the electric motor 22 tries to start with the compressor 20, which is a mechanical load, being coupled, a large starting current (more than several times that of steady operation) flows. 22 is detected, the time phase angle is minimized, and a large voltage is applied to prevent startup failure. Incidentally, the occurrence of starting of the motor 22 may be detected using the switching noise of the thermostat 26 or the noise component generated when starting current is generated.The load side of the fuse 34 has a current for detecting the current flowing through the main circuit. A starting detection circuit 58 for the electric motor 22 is provided, which includes a detector 52, a level adjustment circuit 54 connected to the output side of the current detector 52, and a comparison circuit 56 connected to the output side of the level adjustment circuit 54. ing.

The current detector 52 uses a current transformer in this embodiment, but a small resistor for current detection may be inserted in series in the circuit.The detection output of this current detector @ 52 is level-adjusted by a level adjustment circuit 54. After that, the comparison circuit 5B compares it with a predetermined reference value. This reference value is set to a value that can detect a large starting current that flows when the motor 22 attempts to start, and when the detected current after level adjustment by the level adjustment circuit 54 exceeds the reference value, the comparison circuit 5B starts the motor. An occurrence detection signal is output.

A phase control adjustment circuit 7 is provided on the output side of the startup occurrence detection circuit 58.
2 are connected. This phase control adjustment circuit 72 includes a timer 72 connected to the output side of the comparison circuit 5B, a gate circuit 74 connected to the output side of this timer 72, and R2 and R3 connected in parallel in the trigger circuit 42. Four diodes 010~[
113,! :,DIO,! :[111(7) Connection point 0
12 and an SCR inserted between the connection points of 013.

The gate circuit 74 consists of a resistor R19 connected in series between the power source E and the ground, a light emitting diode 014 for indicating when the adjustment circuit is in operation, and resistors R20 and R21. The output side of timer 72 is connected between R19 and 014. Also, both ends of R21 are the gate terminals of the SCR.

Connected to cathode terminal.

The output of the timer 72 is normally at a "low" level, and when the startup occurrence detection signal is input from the startup occurrence detection circuit 58, the output level is immediately set to a "high" level.
The "high" level is maintained for a period of time (usually a few seconds) from the start of startup until the steady rotation speed is reached.

On the gate circuit 74 side, when the output of the timer 72 is at a "low" level, 014 is not lit and the voltage across R21 is approximately zero. Therefore, the SCR becomes non-conductive, and the phase control adjustment circuit 70 is separated by νJ from the trigger circuit frog and has no effect. At this time, the trigger trigger 40 is normally controlled by the phase angle, and the electric load 38 is supplied with a voltage of c±85V. When the output of the e timer 72 to which the voltage is applied reaches the r high J level, 014 lights up and a voltage is generated across R21, making the SGR conductive. At this time, R2 and R3 of the trigger circuit 42 are set to D.
There will be a short circuit through lO~+313, and the trigger 40 will be controlled with a time minimum phase angle of approximately ! to the electrical load 38. A total voltage of 00v is applied.

"action" Next, the overall operation of the above embodiment will be explained.

It is assumed that the plug 30 is connected to a commercial power source and the main power switch 32 is turned on in advance. Also, since the power is turned on, the fan motor 24 and other loads 5
Since current flows through 0, it is assumed that the trigger 40 normally controls the phase of the voltage using the phase angle.
The voltage on the load 38 side is 85V.

First, the temperature of the freezer compartment 14 is lower than the upper limit temperature and the thermostat 2
Assume that circuit B is open and 22 motors are stopped.

The fan motor 24 rotates at a low speed with an applied voltage of 85V to slowly circulate the air in the freezer compartment 14.As mentioned above, since there is a certain amount of air circulation, the fan motor 24
The temperature is generally constant as a whole, and all products 12 are controlled to a predetermined temperature state.

Meanwhile, the cooling system is not working, and the freezer room! The temperature of partition wall 14 gradually rises, but since the amount of air circulation is small,
The heat exchange effect that occurs between the outside air and the freezing compartment 14 across A is weak, so even if there is a temperature difference between the outside air and the outside air, the rate of temperature increase in the freezing compartment 14 is slow.

This means that after the thermostat 28 is turned off,
This results in a longer time interval before thermostat 2B turns on, and the freezer! This is equivalent to reducing the thermal load of No. 4. Therefore, the power consumption required for freezing the freezer compartment 14 can be reduced.

After that, time passes and it's time for the freezer! When the temperature of thermostat 2G increases and reaches the upper limit temperature, the circuit of thermostat 2G is closed.

When thermostat 2B closes the switch, contact switch 46 closes. As a result, a voltage of 85V is applied to the electric motor 22. The electric motor 22 is energized by voltage application and tries to start, but because the compressor 20, which is a mechanical load, is connected, it does not start immediately, and at this time, a large starting current flows.

From this starting current, the starting occurrence detection circuit 58 detects the
In the 0 phase control adjustment circuit 70 which detects the occurrence of the 2 activation and outputs the detection signal to the phase control adjustment circuit 70, the timer 72 starts immediately upon input of the detection signal. At the same time as the timer starts, R2 and R3 in the trigger circuit 42 are short-circuited. Therefore, triac 40 provides phase control with a minimum phase angle and applies a total voltage of approximately 100V to load 38.

For this reason, when starting the induction motor 41!48, 100v 1
Sufficient voltage is applied for smooth startup operation, resulting in smooth startup. For example, 4 is set in advance by the timer 72.
When S has elapsed, the time has elapsed and the triac 40 returns to the normal phase angle control state for power saving. After that, the electric motor 22
is operated at 85V to save power for the electric motor 22 itself. The electric motor 4122 is operated until the temperature of the freezer compartment 14 falls to a predetermined lower limit temperature and the thermostat 2B is opened.

Of course, approximately 100% of the total voltage is applied to the fan motor 24 during the 48 hours from when the electric motor 22 starts to start until the time-up occurs.
V is applied and the fan motor 24 rotates at a high speed, but even after the time-up returns to the normal phase angle control state, while the electric motor 22 is operating, a high voltage is applied to the fan motor 24 and the fan motor 24 rotates at a high speed in the following manner.

That is, in the normal phase angle control state, the trigger 4
During the period when 0 is off, power is not supplied to the load side from the power supply AC100V.However, even when power is not supplied from the acioov power supply, the motor 22 itself continues to rotate due to inertia, so during this period the motor 22 continues to rotate due to inertia. 22 functions as a generator and provides power to other electrical loads.

Therefore, while the triac 40 is on, the commercial power supply AC1
Since power is supplied from the electric motor 22 from 00V while the triac 40 is off, the fan motor 24 is operated at a voltage higher than 85V, for example, around 95V, and rotates at high speed.

The high-speed rotation of the fan motor 24 generates a large amount of air circulation in the freezer compartment 14, which promotes the heat absorption action of the evaporator 28, which increases the electricity-heat exchange efficiency of the refrigeration system and quickly lowers the temperature. The duration of one operation of the electric motor 22 is short.

In addition, by the high speed rotation of the fan motor 24, the cold air generated in the evaporator 2B is carried to every corner of the freezer compartment 14, so that every product 14 is sufficiently frozen.

When the thermostat 2B opens and the contact switch 46 opens, the electric motor 22 stops and returns to its original state.

In this embodiment, since the amount of air circulation in the freezer compartment by the fan motor can be varied by the phase control circuit, it is easy to set the power saving rate, and there is almost no wasted power consumption of the phase control circuit itself.

In addition, in addition to the fan motor, a voltage dropped by the same phase control circuit is applied to the electric motor for driving the compressor, so there is almost no reduction in the refrigerating capacity of the compressor, and power is saved in the operation of the electric motor itself. can be done.

In addition, since the fan motor and the compressor drive motor are installed in parallel on the load side, while the refrigeration equipment is operating, a low voltage is applied to the motor to save power, while a high voltage is automatically applied to the fan motor to evaporate the evaporation. Promotes heat absorption of the vessel and increases thermal efficiency.

In the above embodiment, the thermostart 2B as a temperature sensor and the contact switch 46 are mechanical types, but electronic types such as a thermistor or a non-contact switch may be used.

FIG. 2 is a circuit diagram showing a second embodiment of the present invention, in which the activation detection circuit 58A is connected to the relay coil 4
It consists of a contact switch 76 that closes when energized and opens when demagnetized, a resistor R22 connected in series to this contact switch 7B, and a monomulti 78 connected to the output side.

In this second embodiment, when the thermostat 2B closes the circuit, the contact switch 78 closes and the monomulti 78 is activated.
It is designed to output a startup occurrence detection signal which is a "high" level pulse. The contact switch 76 may be an electronic type, such as when the temperature sensor is an electronic type.

The rest of the structure is the same as that of the first embodiment.

FIG. 3 is a circuit diagram showing a third embodiment of the present invention. In this embodiment, a startup occurrence detection circuit 58B consists of a variable resistor R23 and a resistor R24 connected in series between a power supply and ground.

In this embodiment, switching noise generated, for example, when the thermostat 28 is closed, is transferred from the main circuit to the trigger circuit 42. Diode bridge atO゛~D13,
The timer 72 is triggered by looping from the ground side of the gate circuit 74 to the ground side of the resistor R24 to start the timer.

When a voltage is applied to the electric motor 22 by adjusting the variable resistor R23, the timer can be started using the noise that occurs when starting the motor. Fig. 4 is a circuit diagram showing an FF54 embodiment of the present invention. Yes, fan motor 24
and the electric motor 22 are supplied with power by phase control circuits 80 and 90 in separate systems. Although not shown, other electrical loads are also supplied with power through a separate system.

The phase control circuit 90 includes a trier-7 circuit 92. Snubber circuit 84. It is composed of a trigger circuit 98 and a well-known start-up compensation circuit 98.

On the other hand, the phase control circuit 80 has a triac 82. It is composed of a trigger circuit 84.

By arranging the fan motor 24 and the electric motor 22 as separate systems in this way, separate and different voltages lower than 100V can be applied to each.

Note that the trigger circuit 84 is connected to a circulation amount control circuit 102 that is connected to a current detector 100 as an example of a refrigeration device operation detection circuit provided in the main circuit on the motor 22 side. This control circuit 102 is a gate circuit 1 that generates a gate signal while the current detector 100 is detecting current.
04, and diodes 020 to D23 connected in a bridge between both ends of the SCR and SGH that are turned on by this gate signal and the variable resistor R30 of the trigger circuit 84.

While the motor 22 is stopped, no current flows through the main circuit and the gate circuit 104 does not output a gate signal. Therefore, the variable resistor R30 is not shorted and the fan motor 24 is powered at 80V, for example.
It is operated at a reduced voltage.

Conversely, when the electric motor 22 is operating, current flows through the main circuit and the gate circuit 104 outputs a gate signal. Therefore, SCR
is turned on, R30 is short-circuited, the fan motor 24 is phase-controlled at the minimum phase angle, and is operated at a voltage of approximately 100V, which is the full voltage.

On the electric motor 22 side, when the circuit of the thermostat 2B is closed, the full voltage of Vtoov is applied at first, so the electric motor A22 starts smoothly, and as it approaches steady rotation, the voltage decreases, and finally drops to, for example, 85V. It is operated at a constant voltage.

FIG. 5 is a circuit diagram of a fifth embodiment according to the present invention. In this embodiment, the line voltage of the commercial power supply AC 100 V drops due to the large starting current that flows when the electric motor 22 is started, so that the occurrence of starting is detected based on this voltage drop.

In addition, the line voltage itself drops dramatically in the evening due to the increase in electricity demand from households, etc., and as a result, the voltage after phase control drops significantly, reducing the refrigeration capacity of the refrigeration equipment, which actually lengthens the operating time. It is possible to prevent such things from happening.

In this embodiment, the functionality of comparator circuit 58 of FIG. 1 is included in timer 720.

In FIG. 5, a transformer BO is connected to the load side of the fuse 34 in parallel to the main circuit. This transformer 60
Converts the primary input AC: 100V to the secondary output AC 12V, and the four diodes 05~ connected to the secondary side
Bridge circuit 62 consisting of port 8, resistor R9, large capacitor C8, bleeder resistor RIG, light emitting diode D9 for power ON indication, resistor R11, Zener diode ZD, and a stable DC voltage of θV (ZD's Zener voltage) from Todoro ctoov. I'm trying to get an E.

The transformer 60 and the bridge circuit B2 also have a function as a power supply voltage detection circuit. That is, although the output terminal voltage BK of the bridge circuit 62 is pulsating, AClooV
When the line voltage changes, BE also changes approximately in proportion to it. This BE is outputted to the level conversion circuit 64 as a power supply voltage detection signal. Note that even if the line voltage decreases to some extent, E hardly changes.

This level conversion circuit 84 connects the DC voltage E with a resistor R12,
It consists of a transistor Tr whose collector is connected through R13 and whose emitter is connected to ground through a resistor R14. The output terminal voltage BE of the bridge circuit 82 is connected to the resistor R.
15 to the base of the Tr.

Therefore, the emitter output E0 of the Tr changes in proportion to BH. This output voltage E. The size of can be adjusted to an appropriate value by changing the variable resistor R13.

The voltage level of the output voltage E0 decreases as the power consumption in a general household increases and the line voltage decreases. Furthermore, when the line voltage transiently decreases due to a large starting current flowing when the induction motor 48 starts up, the voltage level fluctuates downward.

The emitter output E0 of the Tr is applied to the trigger terminal ↑R of the timer circuit 720. In the timer circuit 720, the power supply terminal V is connected to the DC voltage E, and the power supply terminal V is connected to the DC voltage E.
is connected to ground. Reset terminal R is connected to E. In addition, the threshold terminal TI is connected to ground via a capacitor C7, and a resistor RI
It is connected to E via B to R18. TH is also connected to a discharge terminal DC. Rle, R
17 can be selected by a changeover switch 74, and R17 is a variable resistor.

R18 and C7 are for setting one hour of the timer circuit 720, and are about 45.

The control voltage terminal Cv of the timer circuit 720 is connected to ground via a capacitor C8 to prevent malfunction.

The thus configured timer circuit 720 operates as follows. That is, assuming that the DC terminal and output terminal OUT are at a "low" level in advance and C7 is in a fully discharged state, the input level of the Tr terminal is 1/3 or less of the applied voltage between V+ and V- ( When this falls to a trigger threshold (VTR), a timer start operation is performed to open the DC terminal and at the same time set the output terminal 0tlT to a "high" level.

Then, as time passes, charging of C7 progresses via RlB, and when the + side voltage of C7 reaches 273 or more of the applied voltage between V and -V-, a time-up occurs and the DC terminal is set to the "low" level. At the same time, set the output terminal OUT to "low"
level.

The level of the emitter output E0 of the Tr is set to be higher than the trigger threshold VTR by a predetermined amount under normal operating conditions.

The OUT terminal of the timer circuit 720 is connected to the gate circuit 74.

In this embodiment, when the temperature of the freezer compartment 14 rises and the thermostart 26 operates to close the contact switch 24B, the induction motor a22 attempts to start, and at this time a large starting current flows.

This starting current affects the commercial power supply side, and the line voltage transiently decreases and fluctuates due to the internal voltage drop. This line voltage drop fluctuation is caused by the transformer 60 and the bridge circuit 6.
2, the emitter output of the Tr is detected by E. It is input to the TR terminal of the timer circuit 720 as a fluctuation in the timer circuit 720.

Since the decreasing fluctuation of Eo is large, it falls below the trigger threshold VTR of the timer circuit 720, and the timer starts. R2 and R3 in the trigger circuit 42 at the same time as the timer starts.
is shorted. Therefore, triac 40 provides phase control with a minimum phase angle and a total voltage of approximately 100V is applied to load 38.

Therefore, when the induction motor 48 is started, a voltage of 100V, which is sufficient for a smooth starting operation, is applied, so that the induction motor 48 is started smoothly. Approximately 45 preset by timer circuit 720
When time has elapsed, the triac 40 returns to the normal phase angle control state.

Next, when the voltage drop occurs on the commercial power supply side due to an increase in electricity demand in general households in the evening and the line voltage drops to 100 V AC, the DC voltage E is kept constant at ZD, but the output of the bridge circuit 82 The end voltage BE decreases.

In response to this decrease in BH, the emitter output E0 of the Tr also decreases.

When the EQ level decreases to below the VTR, timer circuit 720 is started. As a result, load 3
When the voltage applied to side 8 becomes full voltage and the motor 22 is in operation, the cooling capacity decreases due to the extreme drop in the applied voltage, which may result in a long time taken to cool the product or a decrease in the operating efficiency of the motor 22. etc. can be prevented.

In addition, the timer circuit 720 is configured to immediately restart the timer if Eo is still below the VTR after 4 seconds have elapsed since the start, and the above-mentioned phase control of all voltages is continued. Ru.

In this fifth embodiment, as in the case of FIG. 3, switching noise generated by the thermostat 26 and noise generated by the electric motor 22 at the initial stage of startup are generated.

Main circuit, trigger circuit 42, diode bridge 010
~013, E by going around from the ground side of R21 to the ground side of R14, or entering the base circuit of the base circuit from the air by induction. Therefore, by appropriately adjusting R13, the timer circuit 720 can be triggered by the noise component riding on Eo. In this case, capacitor C is connected in parallel to R15 as shown by the dotted line.
Connecting O improves sensitivity to noise components.

Incidentally, in each of the above embodiments, the rotation speed of the fan motor is reduced using a phase control circuit, but the "effect of the invention" may also be achieved by using a slide-duck or other method. According to the refrigerator, the amount of gas circulated by the fan motor is reduced to equivalently reduce the thermal load on the freezer compartment, so the inside of the object to be frozen can be maintained at a nearly constant temperature with a simple configuration. It has an excellent effect of saving power.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing a vending machine according to a first embodiment of the present invention, and FIGS. 2 to 5 are circuit diagrams showing second to fifth embodiments, respectively. In the figure, 14...Freezing room, 20-...Compressor, 22...
・Electric motor, 24... Fan motor, 28... Thermostat, 313, 80, 9Q... Phase control circuit, 4
6...Contact switch. Patent Applicant ESP Planning Procedures Amendment May 28, 1985 Manabu Shiga, Commissioner of the Patent Office 1 Display of 4g items P - etc. [4., 2
-゛Patent application 2 filed on May 20, 1985 Name of invention Refrigerator 3 Relationship to the case of the person making the amendment Name of patent applicant SP Planning Co., Ltd. 4 Agent address 1-17 Toranomon, Minato-ku, Tokyo -7 “Spontaneous A 7 Subject of amendment 1 Figure 8 Contents of amendment

Claims (2)

[Claims] (1) A refrigerator including a refrigeration device for freezing an object to be frozen and a blower device for circulating gas inside the object to be frozen, wherein the blower device includes a circulation amount adjusting device that changes the amount of circulation. A refrigerator characterized by: (2) The circulation amount adjusting device is equipped with a circulation amount control device that maximizes the circulation amount when the refrigeration device is in operation and reduces the circulation amount to a predetermined amount when the refrigeration device is stopped. Refrigerator according to scope 1 (3) The circulation rate adjusting device is a phase control circuit provided between the power source side and the load side, and the load side is equipped with a blower device and a refrigeration device in parallel. A refrigerator according to claim 1.