KR0137755B1 - Elimination frost control device for automatic vending machine - Google Patents

Abstract

purpose

Vending machines that store or sell products by cooling or heating them share one or two room cooling with one evaporator for indoor cooling, but conventionally defrosting the evaporator by turning off the freezer for 15 minutes every 8 hours. Since only the defrost was sometimes incomplete, and the cooling failure was caused by the freezing of the evaporator, the improvement was made.

Description

Defrost Control Device of Vending Machine

1 is a configuration diagram of a vending machine cooling system as a cooling / heating control device of an embodiment of the present invention.

2 is a flowchart of defrost control of the cooling / heating control device of FIG.

* Explanation of symbols for the main parts of the drawings

1: Refrigerator (MC) 2-1: Left valve

2-2: Right valve 4-1, 4-2: Shutter

5-1: Thermistor for detecting left evaporator temperature

5-2: Thermistor for detecting the right evaporator temperature

6: Cooling and heating control device

The present invention relates to a defrosting control device which performs defrosting by disconnecting a refrigerant supply to a evaporator of a vending machine capable of cooling a plurality of product storage using a single evaporator every predetermined period.

FIG. 1 is a configuration diagram of a cooling system of a vending machine as an embodiment of the present invention. Hereinafter, the prior art will be described using this drawing. Further, in the prior art, the thermistors 5-1 and 5-2 for evaporator temperature detection of FIG. 1 are not provided.

1 is an example of a vending machine having four (high) rooms capable of cooling or heating for product storage. That is, R1 to R4 are referred to as left chamber, solid chamber, middle chamber chamber, and right chamber chamber sequentially in these four chambers. Next, reference numeral 1 denotes a refrigerator (abbreviated as MC), and reference numerals 3-1 and 3-2 denote evaporators, respectively, which are a left evaporator and a right evaporator, respectively. Reference numerals 2-1 and 2-2 denote solenoid valves for opening and closing the refrigerant supplied from the freezer MC 1 to the left evaporator 3-1 and the right evaporator 3-2, respectively. It is called right valve.

Reference numeral 4-1 denotes a shutter for opening and closing the hole portions on the partition walls of the left chamber R1 and the solid chamber R2 by a solenoid, not shown, and the left evaporator 3-1 is a shutter of the shutter 4-1. At the time of opening, two chambers of the left chamber R1 and the solid chamber R2 are cooled, and only the left chamber R1 is cooled at the closing of the shutter 4-1.

As described above, reference numeral 4-2 denotes a shutter for opening and closing the holes on the partition wall between the middle and right chamber R3 and the right chamber R4, and the right evaporator 3-2 opens or closes the shutter 4-2. Upon closure, only two rooms or rooms R3 in the rooms R3 and R4 are respectively cooled.

Reference numerals 7-1 to 7-4 denote thermistors for detecting the room temperature of the rooms R1 to R4, respectively. In addition, an unillustrated heater for heating the room is provided in the rooms R1 to R4, respectively. Reference numeral 6 denotes a cooling / heating control device that uses the above-described means to cool or heat control the temperatures of the respective rooms R1 to R4 to a constant temperature.

However, in the case of continuing operation of the evaporators 3-1 and 3-2, the evaporator will adhere to the moisture in the room air to be cooled with the passage of time, causing deterioration of the cooling capacity of the evaporator. In this example, the conventional cooling / heating control device 6 forcibly turns off the refrigerator (MC) 1 for 15 minutes every 8 hours to prevent (defrost) adhesion.

The defrosting control method of the evaporator in the conventional vending machine having the above-described configuration was a control method in which the frost of the evaporator was removed when the freezer MC was turned off for 15 minutes every 8 hours. However, in this type of vending machine, the fluctuation of the indoor condition, which is the cooling target of the evaporator, is so large that frost cannot be completely removed only by turning off the MC every 8 minutes for 15 minutes. There was a time when the evaporator was frozen, making room cooling impossible.

Therefore, a method of increasing the frequency of defrosting or increasing the off time of the freezer in order to perform defrosting in spite of any fluctuation of indoor conditions can be considered, but this causes a problem that the constant cooling state worsens.

Accordingly, an object of the present invention is to provide a defrosting control device for a vending machine that can solve such a problem.

The object of the present invention is to cut off the refrigerant supply every certain period (8 hours, etc.) to the evaporator of a vending machine that can cool multiple product storage using one evaporator (left evaporator 3-1, etc.). A defrosting control device for performing defrosting, comprising: temperature detecting means (thermistor 5-1, etc.) for detecting a temperature of the evaporator; After the defrost is performed for a predetermined period (15 minutes, etc.), it is achieved by a defrost control device having a cooling / heating control device that continues the defrost until the detection temperature of the temperature detecting means exceeds a predetermined value.

Install a thermistor on each evaporator and detect the evaporator temperature. In addition, the control temperature of the evaporator is preset. Thus, for example, if the temperature of the evaporator is equal to or lower than the set temperature after 15 minutes of defrosting time every 8 hours, the refrigerator MC is stopped and defrosting is performed.

Next, an embodiment of the present invention will be described based on FIGS. 1 and 2. In the present invention, thermistors 5-1 and 5-2 for evaporator temperature detection are attached to the left evaporator 3-1 and the right evaporator 3-2 of FIG. Moreover, the preset temperature at the time of completion | finish of defrost of an evaporator is previously input to the cooling / heating control apparatus 6 of this invention.

2 shows a flowchart of defrost control for the left evaporator 3-1 of the cooling / heating control device 6 of the present invention. Next, FIG. 2 is explained with reference to FIG. Moreover, the signs of S1 to S5 show the steps in FIG.

That is, the cooling / heating control device 6 receives the defrosting instruction to turn off the freezer (MC) 1 for 15 minutes every 8 hours from the main controller of an unshown vending machine and turns off the freezer (MC) 1 ( S1, S2). Thus, when the defrost command is released after 15 minutes, the cooling / heating control device 6 detects the temperature of the left evaporator 3-1 through the thermistor 5-1 (S3). If the temperature is below the set point (branch Y), since the defrost of the left evaporator has not been completely achieved yet, the defrost is continued by turning off the freezer (MC) 1 or the left valve 2-1 (S4). (Restore to S3). Thus, if the temperature of the evaporator is above the set value (S3, branch N), the defrost is recognized as defrost has been achieved, and the freezer (MC) 1 and the left valve 2-1 are turned on together to normally be turned on. Return to the operation of (S5).

Moreover, the above defrost control is equally applied to the right evaporator 3-2.

According to the present invention, the thermistors 5-1 and 5-2, which are temperature detection means for detecting the temperature of the evaporator, and a cooling / heating control device 6 in which the control temperature of the evaporator is set in advance are further provided in the conventional defrosting control device. After the defrosting time of 15 minutes has elapsed every ordinary 8 hours, the cooling / heating control device 6 detects the temperature of the evaporator through the thermistors 5-1 and 5-2, and the temperature of the evaporator is set to the set value. If it is less than or equal to or less than the refrigeration (MC) or the valve to continue to perform defrosting, it is possible to completely perform the defrost of the evaporator every 8 hours.

Claims (1)

A defrosting control device for performing defrosting by disconnecting a refrigerant supply to a evaporator of a vending machine capable of cooling a plurality of goods storages by using a single evaporator for a predetermined period, comprising: temperature detecting means for detecting a temperature of the evaporator; And a cooling / heating control device for continuing the defrost until the detected temperature of the temperature detecting means exceeds a predetermined value after the defrosting has been performed for a predetermined period of time.