JPS6287777A - temperature control device - 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] "Industrial Application Field" This invention is applicable to the temperature of display heated storage cases and display frozen cases in food stores, vending machines, and hot storage/refrigeration machines installed in warehouses, etc. The present invention relates to a temperature management device that can save power in a management device.

``Conventional Technology'' In order to reduce power costs and make effective use of limited resources, research into energy saving measures for electricity 4 is being actively conducted. Among them, refrigerators, which are electric heat exchangers, 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 fMt method for conventional refrigerators described above has almost reached a state of technological perfection, and even further significant I
! It was a very difficult situation to expect i-den.

This also applies to hot storage.

This development was developed in view of the shortcomings of the conventional technology, and the temperature of refrigerators and warm storage units such as refrigerators and warm storage units that can save electricity by using a cylinder configuration is 100%. The purpose is to provide management equipment.

"Means for Solving the Problems" The configuration of the present invention in accordance with the above object includes a heat supply device that supplies heat to a temperature-controlled object, and a blower device that circulates gas inside the temperature-controlled object. In temperature control equipment,
The air blower is equipped with a circulation amount control device, and this circulation amount W
The equipment includes a blower HL power increasing device that can increase the air blowing capacity of the blower, and a blower source power increasing device that increases the amount of gas circulating when the heat supply device is in operation, and increases the amount of gas circulated when the heat supply device is stopped. The gist thereof is to include a circulation amount control device for reducing the amount of gas circulation.

In short, the present invention improves the efficiency of heat supply by increasing the capacity of a forced air device in which a hot or cold heat supply device is operating.
In addition, while the heat supply equipment is stopped, the amount of gas circulating in the temperature-controlled object affects the heat exchange rate between the temperature-controlled object and the outside, so the amount of gas circulation is reduced and the heat exchange rate is reduced. The present invention is characterized in that it reduces the temperature change of the temperature-controlled object and achieves 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 has a freezer compartment 14 that stores a large number of canned juices 12, and canned juices can be delivered from the freezer compartment 14 to a product outlet 16 as needed! A product supply mechanism 18 for supplying 2, a compressor forming part of the refrigeration system
20, an electric motor 22 for driving the compressor 20, a fan motor 24 for circulating air in the freezer compartment 14, a fluorescent lamp, a microcomputer system, etc. are installed. In the freezing chamber 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 26 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 a switch operation accompanying a temperature change.

The electric JA22 is a commercial type [AClooV is supplied with power through the contact switch 46 phase control device 100.

The contact switch 46 is closed by the relay coil 44 which is excited by the energization when the thermostat 2B is closed. By applying a voltage of about 85 V during steady operation of the A22, the operating point on the rotation speed-torque characteristic is changed, and the efficiency of the electric A22 is improved without changing the spacing force of the compressor 20, thereby saving power. This is for the purpose of achieving this goal. This phase control device 100 has a starting compensator 1t, so that the voltage toov is directly applied to the motor 22 when the motor 22 is started.

On the other hand, the fan motor 24 is provided in existing vending machines and has a rating of, for example, 100V. This fan motor 24
A 100V:115V transformer 102 as a booster for increasing the amount of air blown and a phase control device 104 as a circulation amount control device are provided between the AcioovML source and the AcioovML source. This phase control device 2ffi 104 includes a trier 2 106, a trigger circuit 108, and a phase control adjustment circuit 11.
Consists of 0.

The trigger circuit 108 includes a fixed resistor R1, a variable resistor R2, and a conode capacitor C1 connected in series, and then a triac 106.
are connected in parallel between 71 and 72 of R2 and Cl +
111 is connected to the gate terminal G of the switch 10B via the BSB element.

The one-phase control adjustment circuit 110 also includes a diode bridge 112 consisting of diodes 01 to D4 connected to both ends of R2 in a predetermined direction, a connection point between ports 1 and 2, and a connection point between ports 03 and [
It consists of a thyristor (SCR) inserted between 14 connection points, and when a gate signal is input to this SCH, the SCR
conducts to short-circuit R2.

This trigger circuit 108, when R2 is not shorted,
Tochiiatsuk! During the period when the Tl side of 08 is positive and the 72 side is negative, current flows from C1 to R2 and R1, and conversely, the Tl side is negative,
During the period when T2 side is positive, itt flow flows from R1 and R2 to C1, and in both cases, after the polarity changes, C1 and R
After a predetermined charging time determined by 1°R2, the SBS is switched and a negative or positive trigger pulse is applied to the G terminal of the trigger 10B.

When a trigger pulse is input from the trigger circuit 108, the trigger 10B becomes conductive, and then remains conductive until the current flowing between Tl and 72 becomes zero.After the input voltage becomes zero voltage, the trigger pulse 10B is turned on by receiving a trigger pulse.
The period until B becomes conductive is called the phase angle. This phase angle can be varied by adjusting the variable resistor R2. In this embodiment, for example, the phase angle is input from the transformer 102 without shorting both ends of the resistor It is set to a value that lowers the AC 115V voltage (line voltage) to 8QV and supplies it to the fan motor 24. The phase angle at this time is hereinafter referred to as the "normal phase angle."

On the other hand, R1 is much smaller than R2, and the resistance R
The fan motor 24 is set so that when both ends of the fan motor 24 are short-circuited, the non-conduction angle becomes a minimum phase angle close to zero.
is applied almost as is.

In addition, by appropriately changing the value of R1, 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 are short-circuited is, for example, 110V.

Note that a hysteresis reducing circuit may be added to C1 in the trigger circuit 108.

An operation detection circuit 200 is provided in the power supply system on the electric Ja22 side. In this embodiment, the operation detection circuit 200 is connected to the phase control device 100 on the load side of the contact switch 46.
It consists of a transformer 202 provided in parallel with the electric motor 22 and a DC conversion circuit 204 connected to the secondary side (low voltage side) of this transformer 202, and outputs a DC rotation detection signal while the contact switch 46 is closed. The gate signal is applied from the direct current conversion circuit 204 to the gate terminal of the SCR. A current adjustment resistor R3 is provided between the gate terminal and cathode of the SCR.

Therefore, while the electric motor 22 is operating, the fan motor 24 is
A high voltage higher than the rated 5V will be applied, and a low voltage of 80V will be applied when the electric @22 is stopped.

When the thermostat 26 reaches a predetermined upper limit temperature, it closes the circuit and energizes the relay coil 44.

The contact switch 4B is closed by the excitation of the relay coil 44, the electric motor 22 starts operating, 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 the fan motor 6 to stop the operation of the electric motor 22, is always rotated.

Since the fan motor 24 is a fan 48 whose load requires a torque proportional to the square of the speed, in the case of a 100V fan motor 24, when the applied voltage increases compared to during IQOV operation, the rotation speed increases and the inside of the freezer compartment 14 increases. The amount of air circulated in the freezer compartment 14 increases, and conversely, when the applied voltage decreases, the rotational speed 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 unit that increases the heat absorption efficiency (cooling efficiency) of the evaporator 28 by applying it to the evaporator 28. ing.

When the compressor 20 is operated, the refrigerant evaporates in the evaporator 2 days and heat is removed from the area around the evaporator 28. At this time, the fan motor 24
Since the evaporator 28 is rotated at a high temperature by manually applying a voltage S higher than the rated voltage I7, a large amount of air flows into the evaporator 28 compared to when the evaporator 28 rotates at the rated speed, and the heat absorption action is greatly promoted. For this reason, the electricity of the refrigeration equipment
The heat exchange rate improves and the temperature drops quickly, so the electric motor requires 22J per use! l! The continuous rotation time is short.

On the contrary, when the compressor 20 is stopped, the following occurs.

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 air wave 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.

For this reason, 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 inside the freezer compartment 14 reaches the upper limit temperature when the thermostat 2B is turned on next. It takes a long time for the temperature of the freezer compartment 14 to rise, so the thermal load is equivalently reduced, and the power consumption required for freezing the freezer compartment 14 can be reduced. This makes it possible to save power by a factor of about 2. This 1 itu
can be varied by changing the rotational speed of the fan motor 24, for example by changing the applied voltage. in particular,
The resistance value of R2 in the trigger circuit 10B described above may be changed.

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

Since current flows through the fan motor 24 and other loads 50 in advance, it is assumed that the switch 106 normally controls the voltage phase using the phase angle. Therefore, the voltage on the fan motor 24 side is 80V.

First, the temperature of the freezer compartment 14 is lower than the upper limit temperature and the thermostat 2
It is assumed that the circuit G is open and the motor 22 is stopped.

The fan motor 24 rotates at a low speed with an applied voltage of 80V 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.

On the other hand, the temperature in the freezer compartment 14 gradually rises due to the inoperation of the cooling system, but since the air circulation r5 is small, the partition wall
The heat exchange effect generated between the outside air and the freezing compartment 14 sandwiched by the 4A is weak, so even if there is a temperature difference between the outside air and the outside air, the rate of temperature rise in the freezing compartment 14 is slow.

This means that after thermostat 2B turns off,
This results in a longer time interval until the thermostat 26 is turned on, which is equivalent to a reduction in the thermal j1 load in the freezer compartment 14. Therefore, the power consumption required for freezing the freezer compartment 14 can be reduced.

As time passes, the temperature of the freezer compartment 14 rises until it reaches the second limit temperature, and the circuit of the thermostat 26 is closed. When the thermostat 26 closes the switch, the contact switch 4G closes.

Then, the phase control device f! A starting compensation circuit (not shown) of 1100 operates, and a voltage of 100V sufficient for smooth starting operation is initially applied, and the motor 22 starts smoothly. For example, about 48 seconds after entering steady operation, the phase control device 1
00 outputs 85V and controls the electric motor 22 itself.The electric motor 22 is operated until the temperature of the freezer compartment 14 falls to a predetermined lower limit temperature and the thermostat 26 is opened.

When the contact switch 46 is closed and the electric motor 1122 is operated, the operation detection circuit 200 detects this and sends the gate signal to the SCR.
Output to. The SCR is energized by the gate signal input to conduct and short R2. For this reason the tiger.

The earphone 106 performs phase control with the minimum phase angle, and the voltage of 115V, which is the output of the secondary side of the transformer 202, is directly applied to the fan motor 24.

Therefore, the fan motor 24 receives a voltage of 115V, which is higher than the rated voltage of TOOV, and rotates at a much higher rotational speed than the rated rotational speed, causing a large amount of air to flow into the evaporator 28 and causing large air circulation within the freezer compartment 14. give rise to quantity.

Therefore, the heat absorption effect by the evaporator 28 is greatly promoted, the electricity-heat exchange efficiency of the refrigeration system is increased, and the temperature is quickly lowered, so that the electric motor 222! The continuous rotation time is short.

Further, by the high-speed rotation of the fan motor 24, the cold air generated in the evaporator 28 is carried to every corner of the freezer compartment 14, so that every product 14 is sufficiently frozen.

When the thermostart 26 opens and the contact switch 46 opens, the electric motor 22 stops and returns to the original state.

In the embodiment described above, the voltage applied to the fan motor 24 is increased to increase the air blowing capacity, and the amount of circulation can be varied by the phase control device, so there is an advantage that the configuration is relatively in-cylinder.

In addition, an inverter capable of generating a power source with a frequency higher or lower than the rated input frequency of the fan motor is installed on the input side of the fan motor to increase the air blowing capacity and control the circulating fluid based on the operation detection signal. In addition, the circulation amount may be controlled by varying the power applied to the fan motor. For example, in the case of the step-up type in the above embodiment, a high voltage of 115V is constantly applied to the fan motor, and the fan motor is A movable baffle plate may be provided in front of the motor or in the wave path, and the baffle plate may be fully open when the refrigeration system is in operation and half open when the refrigeration system is stopped, or the blade angle of the fan may be varied.

Furthermore, although the above embodiment was intended for a refrigerating machine in a vending machine, it can also be applied to a refrigerated showcase or a refrigeration system in a warehouse, and the object is kept at a low temperature by supplying cold energy. , it can also be applied to a hot storage where heat flows in and out in reverse directions. In the case of a hot storage, for example, the freezing room of the above embodiment may be used as a hot storage room, the evaporator in front of the fan motor may be used as a heater, and this heater may be turned ON/OFF with a thermostat.

In addition, the air blowing power increasing device uses the transformer or inverter to power the fan motor at 21! ! Alternatively, the object to be temperature controlled may be equipped with a fan motor other than the existing fan motor, and both may be operated in parallel while the refrigeration system is in operation.

In this case, the circulation amount may be varied by completely stopping one fan motor and controlling the rotation of the other fan motor by phase control.

Further, depending on the target equipment, the circulation amount may be reduced to zero while the heat supply device is stopped. Setting the circulation amount to zero can be easily configured by turning off the power using a switch circuit.

“Effects of invention” Above theory 1! As described above, according to the present invention, when the heat supply equipment is in operation, the amount of gas circulation is increased to increase the heat supply efficiency, and when the heat supply equipment is stopped, the gas circulation is reduced to reduce the flow of heat into and out from the outside. Since the temperature is suppressed, it is possible to effectively save a large amount of power while keeping the temperature controlled object at a substantially constant temperature with a simple configuration.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing a vending machine according to an embodiment of the present invention. 14... Freezer room, 20... Compressor, 22... Electric motor, 24... Fan motor, 26... Thermostat, 102... Transformer, 104... Phase control device, 200... - Operation detection circuit. Patent Applicant (Saigen SP Planning., 1st Representative Patent Attorney Hitoyoshi Inagaki - Procedural Registration (Method) October 30, 1985

Claims (1)

[Claims] In a temperature control device equipped with a heat supply device that supplies heat to a temperature-controlled object and a blower device that circulates gas inside the temperature-controlled object, the blower device is equipped with a circulation amount adjustment device, The circulation amount adjusting device includes a blowing capacity increasing device that can increase the blowing capacity of the blowing device, and when the heat supply device is in operation, the blowing capacity increasing device operates to increase the gas circulation amount, and when the heat supply device is stopped, the gas circulation amount is increased. 1. A temperature control device comprising: a circulation amount control device that reduces the circulation amount.