JPH0240469Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a refrigerated/heated storage for vending machines and the like.

Conventional structure and its problems Since vending machines are generally known as this type of refrigerated/heated switching type storage, the conventional vending machine is shown in Figures 1 and 2 as a reference. explain. Hereinafter, refrigeration will be referred to as cold, and heated storage will be referred to as warm.

1 is a main body of a vending machine consisting of a heat insulating wall 2, and the inside of this main body 1 is partitioned left and right by a partition wall 1' extending vertically, and is divided into two product storage chambers (hereinafter simply referred to as chambers) 3a and 3b. It is divided into. And each room 3
Product storage shelves 4a and 4b are provided at a and 3b. Further, the chambers 3a and 3b are provided with evaporators 5a and 5b for cooling and heaters 6 for heating, respectively.
a, 6b, and ventilation fans 7a, 7b for circulating cold air and warm air into the rooms 3a, 3b. A heating thermostat 8 provided in each chamber 3a, 3b controls the heating temperature of each chamber 3a, 3b.
a, 8b, and a gas-filled cooling thermostat 9 which is provided in one chamber 3b and controls the cooling temperature.

Next, the configuration of the cooling system for each chamber 3a, 3b will be explained. It is connected to the electric compressor 10, the condenser 11, and the shunt 12, and the first
Solenoid valve 13a, first capillary tube 14a,
It is successively connected to the evaporator 5a. Further, the other outlet of the flow divider 12 is connected in this order to a second solenoid valve 13b, a second capillary tube 14b, and an evaporator 5b. The electromagnetic valves 13a and 13b are opened and closed by electric signals based on a cold/hot operation selection switching command.

In the above configuration, when both chambers 3a and 3b are in cold operation, both solenoid valves 13a and 13b are opened, and the refrigerant flows through each capillary 13a and 13b to each evaporator 5a and 5b, and both chambers 3a and 3b are opened.
was cooling. Cooling is controlled by a cooling thermostat 9 that detects the temperature of the evaporator 5b in one chamber 3b.
It controlled ON and OFF. When the chamber 3a is heated and the chamber 3b is cooled, the solenoid valve 13a is closed and the solenoid valve 13b is opened, so that the refrigerant flows through the second capillary tube 14b and the second evaporator 5b, leaving only the chamber 3b. The room 3a is operated for cooling.
is heated by the heater 6a. Cooling at this time is controlled by a cooling thermostat 9 that detects the temperature of the evaporator 5b. Further, heating was controlled by a heating thermostat 8a to maintain a constant temperature. Furthermore, the evaporators 5a and 5b are frosted by cycle defrosting, which is performed when the cooling system is stopped. When both chambers 3a and 3b are in warm operation, the cooling system is stopped and the heater 6 is turned on.
Both chambers 3a and 3b are operated at a high temperature by a and 6b.
Heating was controlled by heating thermostats 8a and 8b in each chamber 3a and 3b.

As described above, by selecting and energizing the heaters 6a, 6b, the compressor 10, and the solenoid valves 13a, 13b, the chambers 3a, 3b can achieve combinations of cold-cold, hot-cold, and hot-hot operation, and This vending machine was capable of selling cold and hot products at the same time.

However, if the cooling thermostat 9 is
Since it is installed only in the evaporator 5b, when both chambers 3a and 3b are operated for cooling, the cooling control of the chamber 3a follows the cooling control of the chamber 3b. Therefore, when defrosting by cycle defrosting, there is a lot of frost on the evaporator 5a and not much frost on the evaporator 5b (this occurs when a large amount of high-temperature load is filled in the chamber 3a side). Since the cooling thermostat 9 detects the end of defrost (that is, when the temperature of the chamber 3b rises and the cooling thermostat 9 operates), even if there is frost left in the evaporator 5a, the next cooling operation cannot be started. There was a drawback that it started. If this state is repeated, the evaporator 5a gradually becomes abnormally frosted, and the efficiency of the evaporator 5a decreases, resulting in a disadvantage that the chamber 3a is no longer cooled. In addition, during cold-cold operation, the flow rate of refrigerant flowing to both evaporators 5a, 5b is adjusted by the resistance balance of each capillary tube 14a, 14b, but if abnormal frost formation occurs in only one evaporator, the refrigerant Flow balance is disrupted, chamber 3
This had the disadvantage that the temperatures of a and 3b were further different.

Purpose of the invention This invention eliminates the above drawbacks and detects the defrosting of the double-chamber evaporator during cycle defrost, thereby stopping the cooling system until the defrosting is completed even if there is a difference in the amount of frost on the double-chamber evaporator. However, the purpose is to always operate both evaporators in a frost-free condition to obtain an efficient and stable cooling system.

Structure of the invention The storage of this invention has the temperature-sensing part of the cooling thermostat for controlling the cooling system installed across the evaporators in each room. After detecting and performing cycle defrost, control is performed to start the next cooling operation.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 3 and 4. Components that are the same as conventional ones will be denoted by the same numbers and explanations will be omitted, focusing especially on different cooling thermostats. explain.

15 is a gas-filled cooling thermostat. This cooling thermostat 15 has a main body 15a equipped with a switch, and a switch of the main body 15a.
It consists of a temperature sensing section 15b extending from a power element section that turns on and off. The temperature sensing section 15b is
It passes through the through hole 18 of the partition wall 16 of both chambers 3a, 3b, and the tip of the temperature sensing portion 15b is attached to the end plate 5a' of the evaporator 5a of the chamber 3a via a fixing member 17a. Similarly, a portion of the temperature sensing portion 15b near the main body 15a is attached to the end plate 5b' of the evaporator 5b of the chamber 3b via a fixing member 17b. Further, the gap between the through hole 18 and the temperature sensing part 15b is sealed with a heat insulating material 19 such as polyethylene foam so that no thermal influence occurs in the chambers 3a and 3b.

Further, the through hole 18 is formed at a position higher than the bottoms of the chambers 3a, 3b and higher than the upper end surfaces of the dual chamber evaporators 5a, 5b. This is to prevent defrosting water from entering the through holes 18 and deteriorating the heat insulation performance of the partition wall 16 during cycle defrosting. In addition, when the cooling system is in operation, the temperature sensing part 15b
However, this prevents the defrosting water that melts when the temperature is stopped from flowing through the temperature sensing part 15b and entering the through hole 18. Malfunctions can be prevented.

The cooling state in the cold-cold operation in the cooling system in which the temperature sensing portion of the cooling thermostat 15 is disposed in contact with each of the evaporators 5a, 5b of both chambers 3a, 3b will be described.

The temperature sensing portion 15b of the cooling thermostat 15 is filled with gas (generally R-12).
The pressure inside the main body 15a is detected and linked with the switch on the main body 15a. The gas (fluorocarbon 12, etc.) filled in the temperature sensing section 15b is liquefied when the temperature sensing section 15b is cooled. The liquefaction becomes noticeable at the lowest temperature part of the temperature sensitive part 15b. On the other hand, since the high temperature part does not liquefy, the pressure temporarily increases, but this increased pressure is liquefied in the low temperature part, so the internal pressure of the temperature sensitive part 15b is balanced by the pressure in the lowest temperature part. In this way, since the gas-filled cooling thermostat 15 detects the pressure corresponding to the lowest temperature of the pressure sensing part 15b, the lower temperature of both evaporators 5a and 5b is detected and the cooling system is controlled. will be carried out.
Since the cooling thermostat 15 operates as described above, an imbalance in the amount of frost formed on the evaporators 5a and 5b occurs due to an imbalance in the load when only one chamber is filled with product. However, since the temperature sensing part 15b is placed in contact with the end plates 5a', 5b' of the evaporators 5a, 5b in both chambers, the temperature in the lower chambers 3a, 3b is detected, and both evaporators 5a, 5b are completely closed. The cooling system can be shut down until defrosted. Therefore, both evaporators 5a and 5b can be operated in a frost-free state at all times, thereby improving cooling efficiency.

Next, the operation of the cooling thermostat 15 during cold-hot operation will be explained. If the chamber 3a is set to warm and the chamber 3b is set to cold, the tip of the temperature sensing portion 15b of the cooling thermostat 15, that is, the portion of the chamber 3a that is placed in contact with the evaporator 5a is heated. Further, the portion of the temperature sensing portion 15b that is placed in contact with the evaporator 5b is cooled. As mentioned above, the cooling thermostat 15 is
In order to control the cooling cycle by detecting the temperature of the lowest portion of the temperature sensing section 15b, the temperature of the evaporator 5b is detected and controlled. Also, the through hole 18 is provided with a heat insulating material 19 for both chambers 3a, 3.
Since the evaporator 5b is shut off, there is almost no thermal influence on the temperature sensing part placed in contact with the evaporator 5b, and a normal cooling cycle and cycle defrost are performed.

Conversely, even when the chamber 3a is set to be cold and the chamber 3b is set to be warm, the temperature of the evaporator 5a is detected to detect the temperature of the lower part of the temperature sensing section 15, and the chamber 3a is normally cooled. That is, each room 3a, 3
b can be operated in a combination of cold and hot conditions.

Effects of the invention In the storage of the present invention, the temperature sensing part of the cooling thermostat is placed in contact with the evaporator of the cooling system in each room to detect the temperature of the evaporator and control the cooling system. Even when frost occurs, the cooling thermostat detects the temperature of the evaporator with the lowest temperature and starts the next cooling operation, so the evaporator can always perform cooling operation in good frost-free conditions. This has the effect of increasing cooling efficiency. In addition, by passing the temperature-sensing part of the cooling thermostat through the partition wall at a position higher than the bottom of the chamber, frost on the temperature-sensing part can be removed and frost on the temperature-sensing part can be prevented from refreezing. At the same time, it also prevents it from accumulating on partition walls and deteriorating its insulation performance.

[Brief explanation of the drawing]

Figure 1 is a front sectional view of a storage warehouse showing one conventional example, Figure 2 is a diagram of the cooling system shown in Figure 1, and Figure 3 is a diagram of the cooling system shown in Figure 1.
The figure is a storage warehouse showing an embodiment of the present invention corresponding to FIG. 1, and FIG. 4 is an enlarged sectional view of the main part of FIG. 3. 3a, 3b...Product storage room, 15...Cooling thermostat, 15b...Temperature sensing section, 5a, 5b...
Evaporator.

Claims (1)

[Scope of utility model registration request] A vertically extending partition wall forms product storage chambers on the left and right, each product storage chamber is provided with an evaporator of the cooling system, and one chamber is provided with a cooling thermostat that controls the operation of the cooling system. , a storage in which a temperature sensing part of the cooling thermostat passes through the other compartment at a position higher than the bottom of the product storage chamber of the partition wall, and the temperature sensing part is attached to each evaporator for heat exchange.