JPS59229161A - Refrigerating storage house - 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 the Invention The present invention relates to a refrigerated storage such as a vending machine that defrosts the evaporator of a cooling system by off-cycle defrosting.

Conventional Structure and Problems Since a vending machine is generally known as this type of refrigerated storage, the conventional vending machine will be explained with reference to FIGS. 1 to 4.

Reference numeral 1 denotes a main body of a vending machine consisting of a heat insulating box body 2, and a product storage shelf 4 is provided in an interior 3 of the main body 1. Also,
Inside the refrigerator 3, an evaporator 5 for cooling and a blower fan 6 for circulating cold air are arranged. And the cooling system
An electric compressor 7, a condenser 8, a dryer 9, a capillary tube 10, and the evaporator 5 are sequentially connected by piping. In addition, the capacitor 8 is caused by the capacitor fan 11.
The electric compressor 7 is cooled.

Next, the electric circuit will be explained. An electric compressor 7 and a condenser fan 11 are connected in series to a cooling thermostat 12.
and a blower fan 6 is connected in parallel to the thermostat 12. In the above configuration, the cooling thermostat 12 detects the temperature inside the refrigerator 3 and outputs 0N-OF.
F controlled.

For this reason, the electric compressor 7 and condenser fan 11 connected in series to the cooling thermostat 12 are ○N-0.
It is controlled by FF to cool the interior 3 of the refrigerator to a constant temperature. Furthermore, since the blower fan 6 for cooling the inside of the refrigerator is connected in parallel to the cooling thermostat 12, the blower fan 6 operates continuously regardless of the signal from the cooling thermostat 12. Therefore, while the cooling system is in operation, the blower fan 6 for cooling the inside of the refrigerator continues to rotate, and while the cooling system is stopped, the blower fan 6 continues to rotate continuously.

For this reason, the frost that adhered to the evaporator 5 of the cooling system exchanged heat with the air inside the refrigerator (usually refrigerated at 5 to 6 degrees Celsius), melted it, and was discharged outside the refrigerator. (called cycle defrost).

However, as mentioned above, the porator 5 is not cooled. Since the blower fan 6 is energized even during the off cycle, heat is generated from the motor of the blower fan 6.
This has the disadvantage of increasing electricity costs because it increases the cooling load.

Further, an electric circuit in which the blower fan 6 is connected in series with the cooling thermostat 12 can easily be considered, but in this electric circuit, defrosting during the off cycle is incomplete. Further, to explain another conventional electric circuit with reference to FIG.
and the timer switch 13 was connected in parallel to the cooling thermostat 12. There is also a system in which a switch with a timer 13 and a blower fan for cooling the inside of the refrigerator are connected in series, and a relay 14 starts integration of the timer when the cooling thermostat 12 is cut out. In such an electric circuit, a cooling thermostat 12
When cut out, the coil of the relay 14 is de-energized and the contact 14a of the relay 14 is closed. For this reason,
Since the timer switch 13 is energized and the switch 13a of the timer switch 13 is closed, the air blower 7 continues to rotate. Then, after a preset predetermined time, the timer switch 3 opens and the blower fan 6 stops. When the cooling thermostat 12 is turned on, the blower fan 6 is also operated and this operation is repeated every cycle. However, in this method, if the timer switch 13 is set to the defrost completion time at normal humidity, residual frost will occur in humid conditions with a large amount of frost, and defrost will be incomplete before the next cooling cycle is started. As a result, the cold start rate decreases. Furthermore, if the time of the timer switch 13 is set based on the assumption of high humidity, the power saving effect will be halved. It's Kade.
When installed outdoors in a cold region such as Hokkaido, the outside temperature can routinely drop below 110 degrees Celsius in the winter. In such a case, the cooling thermostat 12 is not opened and the internal cooling fan motor 6 is completely stopped. Therefore, there is no heat load on the inside of the refrigerator 3, so the temperature drops to the same level as the outside temperature, and the cans placed in the product storage shelf 4
There is a risk that the bottles will freeze and explode.

OBJECTS OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks, completely perform off-cycle defrosting, and prevent products in the refrigerator from freezing at low outside temperatures.

Structure of the Invention The refrigerated storage of the present invention is provided with a first switch having both contacts a and b and a second switch having both contacts c and d. compressor,
Connect the condenser fan to the power source. Now, connect the C contact of the first switch and the C contact of the second switch, and
The B contact of the switch is connected to the C contact of the second switch, and the blower fan is connected to a power source via a common terminal of the first switch and the second switch. And the electric compressor of the cooling cycle by the first switch.

By controlling the operation of the condenser fan and blower fan to obtain an appropriate amount of cooling, and at the same time as the first switch is reversed from C contact to B contact, the second switch is reversed from C contact to C contact. Only the blower fan is rotated, and defrosting of the evaporator is detected depending on the temperature of the evaporator, and the second switch is reversed from the D contact to the C contact to stop the blower fan and remove the remaining frost on the evaporator. It can be prevented. Furthermore, when the outside temperature is low, the second switch closes and the blower fan rotates, thereby preventing the products in the refrigerator from freezing due to the heat generated by the motor.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The explanation will focus on different electrical circuits.

15 is the first. This is a two-stage thermostat consisting of second switches 15A, 15B and a heat sensitive section (not shown). 1st
The switch 15A has a contact a, a contact S, and a common terminal 1.
Consists of 5A. Further, the second switch 15B has a contact C
It consists of two contacts d and a common terminal 15B'. and the contact a of the first switch 15A and the second switch 15B.
When the contact C of the first switch 15A is connected to the contact C of the first switch 15A, the second
The contacts d of the switch 15B are connected to each other.

Further, the common terminal 15B' of the second switch 15B and the ventilation fan inside the refrigerator are connected in series.

The electric compressor 7 and the condenser fan 11 are each connected to a contact a of the first switch 15A. Also,
1st. Second switch 16A.

The operating temperature of 15B is set as follows.

The first switch 15A is cut-in β°C = 6°C (the switch closes to contact a), the cut-out is -3°C (the switch is closed to contact A), and the second switch 15B is cut-in -3°C ( The switch is set to contact d), and the cutout is set to 3°C (the switch is closed to contact C).In other words, the cutout temperature of the first switch 15A and the cutin temperature of the second switch 15B are set to the same temperature. The cant-out temperature of the second switch 15B is set to a temperature at which the end of defrosting is detected.

In the electric circuit set in this manner, when the detected temperature of the heat sensitive portion becomes 6° C. or higher (to in FIG. 6), the common terminal 15A' and contact a of the first switch 15A are connected.

When the detected temperature of the second switch 16B is still 6° C. or higher, the common terminal 15B′ and the contact C are connected. Therefore, the first switch 15A causes the capacitor fan 1 to
1 and the electric compressor 7 are energized and the cooling system starts operating. Also, since contact a of the first switch 15A and contact C of the second switch 15B are connected, each contact a,
Since voltage is applied to the blower fan 6 via the C common terminal 15B', the blower fan 6 is energized in synchronization with the condenser fan 11 and the electric compressor 7, and enters normal cooling operation.

(This state is shown in area C in FIG. 6 and in FIG. 7.) After the time t1 for the heat sensitive part to reach 13 degrees Celsius, a signal from the heat sensitive part causes the first switch 15A to switch to contact a.
The second switch 15B simultaneously switches from the contact point C to the contact point d (region C in FIG. 6, shown in FIG. 8). For this reason, the condenser fan 11 and the electric compressor 7
stops.

However, since the contacts of the first switch 15A are connected to the contacts d of the second switch 15B, the power supply voltage is applied through the contacts S, d and the common terminal 15B', so the blower fan 6 is energized. Only the blower fan 6 continues to rotate to circulate the air inside the refrigerator and defrost the evaporator. Then, the defrosting of the evaporator 5 of the cooling cycle is completed (
When the temperature of the heat sensitive part reaches 3°C (after t2) is detected, the contact piece of only the second switch 16b is switched from the contact d to the contact C side (C area in Figure 6, Figure 9). .

Konodame No. 1. Since the second switches 15a and 16B are both open, the blower fan 6, electric compressor 7, and condenser fan 11 all stop. and t
. After 7 hours (when the temperature reaches 6° C.), both switches return to their original states as shown in FIG.

In this way, t1', t2', t♂'...
This operation is repeated for each cycle of A/, If, σ, and each region.

As described above, since the blower fan 6 is delayed so that defrosting is completely completed in each cycle, cooling operation can be performed in a completely frost-free state, bypassing dry and humid periods, and thus improving cooling efficiency. improves.

In addition, even if the outside temperature drops below -5°C, which would cause the products in the refrigerator to freeze, the contact moves to the contact d side of the second switch 1sB, so contacts b, d, and common terminal 15B' are connected. Then, only the blower fan 6 rotates, and the heat generated by the blower fan 6 prevents the temperature inside the warehouse from dropping, thereby preventing the products from freezing.

In this embodiment, the case where a two-stage thermostat is used has been described, but the same effect can be obtained even if the two-stage thermostat is divided into two thermostats.

Effects of the Invention As described above, the present invention uses a first switch to control a cooling system such as an electric compressor, a condenser fan, and a blower fan, and a second switch to detect the end of defrosting. Since the blower fan is stopped at the same time as defrosting is completed, it not only saves electricity compared to continuously energizing the blower fan, but also delays the blower fan by the amount commensurate with the humidity conditions such as high humidity or dryness. No frost residue occurs, improving the efficiency of the cooling system. Furthermore, even if the outside temperature is low enough to cause the products to freeze, the second switch energizes the blower fan, thereby preventing the products in the refrigerator from freezing.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view of a conventional vending machine, Fig. 2 is a system diagram of Fig. 1, Figs. 3 and 4 are electrical wiring diagrams of Fig. 1, and Fig. 5 is a diagram of the present invention. An electrical wiring diagram in one embodiment, FIG. 6 shows a control system signal diagram of the present invention. 7th
Figures 9 to 9 are diagrams showing the contact positions of the two-stage thermostat. 5...Evaporator, 6.Mountain...Blower fan, 7
...Electric compressor, 10...Capillary tube, 11...Condenser fan, 15...Mark 2-stage thermostat, 15A...First switch, 16B ...Second switch. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 3 Figure 4 Figure 7 Figure 9

Claims (1)

[Claims] An electric compressor, a condenser, a capillary tube, and an evaporator are connected in sequence, and the evaporator is installed in the refrigerator. A switch is provided, and via contact a of the first switch, the electric compressor,
Connect the capacitor fan to the power supply, and connect the contact a of the first switch to the contact a of the second switch.
The contact point of the switch is connected to the contact point d of the second switch, and the blower fan is connected to a power source through the common terminal of the first switch and the second switch, and the temperature setting of the first switch is adjusted. At 0°C (α〉0°C), contact a is connected to β°C (β 0°C).
), and the temperature setting of the second switch is reversed to contact d at β°C and to contact C at 1°C<a>γ>0°C.