JP3187927B2 - vending machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vending machine for preserving the temperature of goods stored in cans, bottles, paper packs and the like.

[0002]

2. Description of the Related Art Conventionally, this kind of vending machine has been known as shown in FIGS. The vending machine 1 shown in the sectional view of FIG. 2 has a product column 2 therein,
A duct 3 is formed between the back side and the bottom side between the wall and the wall. An evaporator 4a (4b) is provided below the duct 3.
And a blower 5a (5b) for circulation in the refrigerator,
The air in the product column 2 is blown into the evaporator 4a (4b) through the duct 3 and circulated through the slit 3 'into the product column 2 as indicated by the dashed line arrow. In a machine room 6 below the vending machine, a compressor 7, a condenser 8, and a blower 9 for the condenser are installed.

As shown in the refrigerant circuit of FIG. 3, the vending machine 1 has a compressor 7, a condenser 8, a capillary tube 10 as a pressure reducing device, and first and second solenoid valves 11a, 1 which are normally closed.
1b, the first and second evaporators 4a and 4b are sequentially connected in series, and the refrigerant of the compressor 7 circulates in this order. The evaporators 4a and 4b are connected in parallel, and the refrigerant flows to one or both of the evaporators 4a and 4b by opening and closing the solenoid valves 11a and 11b. In addition, a pair of the evaporators 4a and 4b are paired with the internal circulation blowers 5a and 5b.
Is installed.

[0004] The vending machine 1 constructed as described above is shown in FIG.
As shown in the time chart, when one of the evaporators 4a (4b) is in a cooling operation, the compressor 7 is driven to supply the refrigerant to each of the evaporators 4a and 4b. When the first solenoid valve 11a is open, the first evaporator 4a
When the second solenoid valve 11b is open, the cooling operation is performed in the second evaporator 4b.

Here, the first and second internal circulation blowers 5
a and 5b are constantly driven, and when the evaporators 4a and 4b are in a cooling operation, the cool air is blown and the product column 2 is cooled.
The inside is cooled. On the other hand, when the cooling operation of the evaporators 4a and 4b is stopped, the frost adhering to the evaporators 4a and 4b is removed by the wind of the internal circulation blowers 5a and 5b.

[0006]

However, during the cooling operation and the defrosting operation of each evaporator 4a, 4b, the first and second internal circulation blowers 5a, 5b must be driven. Since the evaporators 4a and 4b are continuously driven even after the completion of defrosting, they cause the outside air to be attracted into the product column 2 and the motor generated when the blowers 5a and 5b are driven. There is a problem that heat enters the product column 2 and the temperature of the product column 2 rises.

An object of the present invention is to provide a vending machine which regulates unnecessary driving of a blower for circulating in a refrigerator and suppresses a rise in temperature of a product storage room in view of the above-mentioned conventional problems.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a compressor, a plurality of evaporators through which refrigerant from the compressor circulates during each cooling operation, and a plurality of evaporators. And a cooling device including an internal circulation blower and the like, which are installed and driven, and drives each of the internal circulation blowers to circulate the air cooled by each evaporator to each product storage room through each duct. in vending machines installed wind detecting means for detecting the amount or pressure of the air circulating within the respective duct, said each of the internal circulating blower, when the cooling operation of each of the evaporators corresponding thereto and When the air flow is smaller than the set amount or when the air pressure is smaller than the set pressure based on the detection signal of each of the wind detection means, it is individually driven. If the pressure is lower than To be higher than the amount or the set pressure
Stop cooling operation of each evaporator corresponding to each wind detection means
And a control means for stopping the compressor is provided.

[0009]

According to the present invention, when defrosting of the evaporator is required based on the detection signal of the wind detecting means, the driving of the compressor and the evaporator is stopped and the blower for circulation in the refrigerator is driven. The defrosting operation time is controlled by the wind detection means, and unnecessary driving of the internal circulation blower after the completion of the defrosting operation is prevented.

[0010]

1 and 5 to 7 show an embodiment of a vending machine according to the present invention. FIG. 1 is a schematic sectional view of the vending machine, and FIG. 5 is a refrigerant of the vending machine. It is a circuit diagram.
2 to 4 showing the conventional example are denoted by the same reference numerals. That is, the cooling circuit of the vending machine includes the first and second evaporators 4a and 4b, the first and second evaporators.
It has blowers 5a and 5b for circulating in the refrigerator, a compressor 7, a condenser 8, a blower 9 for the condenser, a capillary tube 10, first and second solenoid valves 11a and 11b, and are compressed by the compressor 7. As shown by a dashed line arrow in FIG.
→ Capillary tube 10 → First and second solenoid valves 11
a, 11b → first and second evaporators 4a, 4b → compressor 7
The cooling operation is performed in each of the evaporators 4a and 4b by sequentially circulating the evaporators.

As shown in FIGS. 1 and 5, a characteristic structure of the present invention is a passage, that is, a duct for circulating cool air from the first evaporator 4a and the second evaporator 4b into the commodity columns 2a and 2b . Wind pressure sensors 12a and 12b are installed in 3a and 3b , and each device is controlled based on detection signals from the wind pressure sensors 12a and 12b .

Here, the first evaporator 4a and the second evaporator 4b cool the commodity columns 2a and 2b through different first and second ducts 3a and 3b, respectively. Are provided with first and second wind pressure sensors 12a and 12b, respectively, and based on the first and second wind pressure sensors 12a and 12b, the first and second solenoid valves 11a and 11b are respectively provided.
11b and the first and second internal circulation blowers 5a and 5b are individually controlled.

[0013] The vending machine configured as described above has a first
The compressor 7, the first and second internal circulation blowers 5a and 5b, and the first and second solenoid valves 1 are controlled by the CPU 13 having a microcomputer configuration based on the second wind pressure sensors 12a and 12b.
Drive control of 1a and 11b is performed.

FIGS. 6A and 6B show control flowcharts of the CPU 13 during the cooling operation of the evaporators 4a and 4b.
FIG. 7 shows a time chart during the cooling operation. That is, FIG. 6A shows the drive control of the first internal circulation blower 6a, and based on the detection signal of the first air volume sensor 12a, is the air pressure in the first duct 3a higher than the set air pressure? It is determined whether or not it is (S1). This set wind pressure focuses on the fact that frost adheres to the drive of the evaporators 4a and 4b, the ventilation resistance increases, and the wind pressure in each of the ducts 3a and 3b decreases. This is a state that does not reach the frost, and when it is lower than the set wind pressure, it indicates a state in which frost is formed and defrosting is required.

Here, when the wind pressure in the first duct 3a is higher than the set wind pressure, that is, when the defrosting is not required yet,
It is determined whether the first solenoid valve 11a is on (S
2) When the first solenoid valve 11a is off, the driving of the first internal circulation blower 11a is stopped (S3). This is because the first solenoid valve 11a is turned off and the cooling operation of the first evaporator 4a is stopped (A in FIG. 7).
point). On the other hand, when the first solenoid valve 11a is on, it is determined in advance whether the wind pressure in the second duct 3b is higher than the set wind pressure (S4). This is because, as will be described later, when the wind pressure in the second duct 3b is lower than the set wind pressure, the compressor 7 needs to be turned off. Here, when the wind pressure in the second duct 3b is higher than the set wind pressure, the compressor 7 is turned on (S5) and the first internal circulation blower 5a is turned on (S6), and the first evaporator 4a is turned on. Is performed to keep the inside of one of the product columns 2a cool (point B in FIG. 7).

On the other hand, if the wind pressure in the first duct 3a is lower than the set wind pressure in step 1, that is, if the first evaporator 4a needs to be defrosted, the first solenoid valve 11a is turned off (S7).
The compressor 7 is turned off (S8), the cooling operation of the first evaporator 4a is stopped, and the first internal circulation blower 5a is turned on to perform the defrosting operation of the first evaporator 4a ( S9) (FIG. 7)
C point).

On the other hand, also in the cooling operation and the defrosting operation of the second evaporator, as shown in FIG.
It is controlled in the same way as a. That is, the second air volume sensor 12
When the wind pressure in the second duct 3b is higher than the set wind pressure (S) based on the detection signal of b and the defrosting is not necessary yet,
It is determined whether or not the second solenoid valve 11b is on (S
), When the second solenoid valve 11b is off, the drive of the second internal circulation blower 11b is stopped (S) (FIG. 7).
A 'point). On the other hand, when the second solenoid valve 11b is ON, it is determined in advance whether the wind pressure in the first duct 3a is higher than the set wind pressure (S). Here, the first duct 3
When the wind pressure in a is higher than the set wind pressure, the compressor 7 is turned on (S), the second internal circulation blower 5b is turned on (S), and the cooling operation of the second evaporator 4b is performed. The other product column 2b is kept cool (point B 'in FIG. 7).

On the other hand, when the wind pressure in the second duct 3b is lower than the set wind pressure in the step, that is, when the defrosting of the second evaporator 4b is required, the second solenoid valve 11b is turned off (S).
The compressor 7 is turned off (S) to stop the cooling operation of the second evaporator 4b, and the second internal circulation fan 5b is turned on to perform the defrosting operation of the second evaporator 4b (S). ) (Point C ′ in FIG. 7).

Thus, the first and second evaporators 4a, 4a,
The cooling operation in the product columns 2a and 2b is performed by repeating the cooling operation and the defrosting operation of the 4b, but in this embodiment, the defrosting operation time is the wind pressure sensors 12a and 12b.
The defrosting operation is not always performed after the cooling operation as in the related art. For this reason,
Unnecessary driving of the first and second in-compartment circulation blowers 5a and 5b is prevented, and outside air is drawn into the product columns 2a and 2b, or motor heat of each of the blowers 5a and 5b is required. As described above, there is no intrusion into the product columns 2a and 2b.

In the above embodiment, each duct 3a, 3b
Although the wind pressure sensors 12a and 12b are used as wind detecting means in the inside, air flow sensors (not shown) for detecting the air flow in each duct 3a and 3b may be provided instead of the wind pressure sensors 12a and 12b.

[0021]

As described above, according to the present invention,
Based on the detection signal of the wind detection means, when defrosting is necessary, the compressor and the evaporator are stopped driving, and on the other hand, the defrosting operation time is controlled by the wind detection means to drive the internal circulation blower. Thus, unnecessary driving of the internal circulation blower is prevented. Therefore, it is possible to reduce the invasion of the outside air into the product storage room and the invasion of the motor heat of the blower.

[Brief description of the drawings]

FIG. 1 is a refrigerant circuit diagram of a vending machine according to the present invention.

FIG. 2 is a schematic sectional view of a conventional vending machine.

FIG. 3 is a refrigerant circuit diagram of a conventional vending machine.

FIG. 4 is a time chart of a cooling operation in a conventional vending machine.

FIG. 5 is a schematic sectional view of a vending machine according to the present invention.

FIG. 6 is a flowchart of a cooling operation of the vending machine according to the present invention.

FIG. 7 is a time chart of a cooling operation of the vending machine according to the present invention.

[Explanation of symbols]

1: Vending machine, 2a, 2b: Product column, 3a, 3b
... first and second ducts, 4a, 4b ... first and second evaporators, 5a, 5b ... first and second internal circulation blowers, 7 ...
Compressor, 11a, 11b first and second solenoid valves, 12
a, 12b: wind pressure sensor; 13: CPU.

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F25D 11/00 101 F25D 17/06 312

Claims (1)

(57) [Claims] 1. A cooling system including a compressor, a plurality of evaporators through which refrigerant from the compressor circulates during each cooling operation, and an internal circulation blower installed corresponding to each of the evaporators. A vending machine that includes a device and drives each of the internal circulation blowers and circulates the air cooled by each of the evaporators to each of the product storage rooms through each of the ducts. amount or set up a wind detecting means for detecting a pressure, said each of the internal circulation blower, and when the evaporator of the cooling operation corresponding thereto respectively, from the set amount based on a detection signal of each of the wind detecting means It is individually driven when the air volume is small or smaller than the set pressure, and becomes higher than the set volume or set pressure when the air volume is smaller than the set volume or smaller than the set pressure based on the detection signal of each wind detecting means. each of said wind detection up to Respective evaporator of the cold corresponding to the stage
A vending machine provided with control means for stopping the compressor and stopping the compressor .