JPS624865Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is a hot-or-cold system in which multiple product storage areas are partitioned into a cabinet, and the interior of each product storage area is heated or cooled to sell hot or cold products. This invention relates to an operation control circuit for a product vending machine.

The product storage compartments of vending machines that are heated and cooled by heaters or refrigerators are generally equipped with internal fans that circulate and ventilate air within the compartment to uniformly and efficiently heat and cool the stored products. ing. On the other hand, as is well known, the operation of the heater and refrigerator are controlled via a thermostat for regulating the temperature inside the refrigerator so as to maintain the temperature inside the refrigerator at approximately a predetermined temperature.

By the way, in previous vending machines, the fan inside the refrigerator continued to operate while the machine was in operation, but recently, in order to save electricity even a little due to energy saving issues, when the heater or refrigerator is stopped due to the operation of the thermostat, the fan is turned on. , power-saving methods are now being adopted in which the fans inside the refrigerator can also be stopped in synchronization with this. However, while the lever method has the effect of saving electricity, the circulation of air inside the refrigerator stops when the fan inside the refrigerator is stopped. There will be a temperature difference between the temperature of the temperature sensor and the temperature of the temperature sensor, making it impossible to perform accurate temperature control. On the other hand, if the fan inside the refrigerator is operated continuously regardless of the operation of the thermostat, no power saving effect will be obtained, but the air temperature inside the refrigerator and the product temperature will always be almost the same, so the product temperature will be detected correctly. More accurate temperature control is possible. For this reason, when operating a vending machine, depending on whether energy-saving effects or accurate product temperature control are important, thermostats that synchronize the operation mode of the internal fan with continuous operation or with the operation of the thermostat are used. It is desired to be able to manually select synchronous operation, and as a means for this purpose, a thermosynchronous switch is used that manually switches the operating mode of the refrigerator fan to continuous operation or thermosynchronous operation.

Next, an outline of the above-mentioned thermosynchronous switch will be described with reference to FIG. In the figure, U and V are the power supply lines, MC is the electric compressor for the refrigerator, H is the heater, FM is the electric refrigerator fan, Th-C and Th-H are the thermos for controlling the temperature inside the refrigerator and the heater, respectively. Tatsuto and SW are the thermosynchronous switches mentioned above. The switch SW is a multi-contact manually operated switch, the contact SW-a is connected to one power line U via the thermostat Th-C or Th-H, and the contact SW-b is connected directly to the power line U. Connected to U. Therefore, if the continuous operation mode is selected now and the contact SW-b is closed, the refrigerator fan FM will continue to operate regardless of the operation of the thermostat Th-C or Th-H. on the other hand,
If you select the thermosynchronous operation mode and close contact SW-a, the refrigerator fan FM will switch to the thermostat Th-
By the operation of C or Th-H, the compressor
Like MC or heater H, it is de-energized and stopped. Note that FIG. 1 shows an example of a machine exclusively for cold products or a machine exclusively for hot products.

On the other hand, due to the diversification of vending machine models, the above-mentioned hot-or-cold product vending machine, which is capable of selling hot and cold products at the same time with one machine, is now in widespread use. As shown in Figure 2, the vending machine cabinet C is divided into multiple product storage areas A and B, and the product shelves are placed here.
In addition to housing L ₁ and L ₂ , each storage A and B has internal fans FM ₁ and FM ₂ , and a heater.
H ₁ , H ₂ and refrigerator coolers EV ₁ and EV ₂ are built in, and hot or cold operation can be selected for each room. Note that SV ₁ ,
SV ₂ is an electromagnetic on-off valve inserted in the refrigerant circuit. Such hot-or-cold product vending machines are also equipped with the above-mentioned thermosynchronous switch for controlling the operation of the internal fan. However, in the past, one thermosynchronous switch SW was installed to simultaneously and commonly set the operating mode for each of the internal fans FM ₁ and FM ₂ in rooms A and B, as shown in Figure 2. was. In other words, switch SW
If you select continuous operation mode, the internal fan FM ₁
and FM ₂ both operate continuously. In addition, if you select thermosynchronous operation mode, the internal fan FM ₁ and
FM ₂ is energized and controlled by the operation of the thermostats for controlling the temperature inside the chambers A and B, respectively.

However, as shown in Figure 2, in a vending machine that has multiple product storage compartments and allows individual selection of hot or cold operation, the fans in each compartment can be controlled in common by one thermo-synchronized switch. For those that allow you to switch the driving mode,
During actual operation, it became clear that the following operational problems would arise. That is,
When one room A in Fig. 2 is set to cold operation and the other room B is set to hot operation, for example, during winter, the outside air temperature is low, so the refrigeration load on the cold operation side is low, but conversely, the refrigeration load on the hot operation side is low. The load is heavy, and while cold products do not need to be cooled much, it is desirable to keep hot products sufficiently warmed at an appropriate temperature. Therefore, in this case, the energy saving effect obtained by thermosynchronously operating the internal fan on the product storage side in cold operation is significant. On the other hand, in the case of hot operation, it is preferable that the refrigerator fan be operated continuously in order to accurately control the temperature inside the refrigerator. Conversely, in summer, the conditions are opposite to those described above. In other words, in a hot-or-cold product vending machine that has multiple product storage compartments, if the operating mode of the internal fans of each product storage compartment is set in common, it will not be possible to set the operation mode of the internal fans in common for each product storage compartment. Operation control cannot be achieved.

This invention was developed in consideration of the above points, and its purpose is to provide an operation control circuit that allows the operation mode of the internal fan to be individually selected for each product storage according to its operating conditions. There is a particular thing.

This invention will be described in detail below based on illustrated embodiments.

FIG. 3 shows the principle of this invention, and FIG. 4 shows its specific circuit diagram. In other words, unlike the conventional method, in this invention, the internal fans FM ₁ ,
Two independent thermosynchronous switches SW ₁ and SW ₂ are incorporated into the control circuit, one for each FM ₂ , and the operating mode can be selected independently.
As shown in Fig. 4, each thermosynchronous switch SW ₁ and SW ₂ is a multi-contact type switch consisting of two A contacts and two B contacts, and is connected to the circuits of the internal fans FM ₁ and FM ₂ . It is interposed. When the A contact is closed, the internal fan is switched to thermosynchronous operation, and when the B contact is closed, the fan is switched to continuous operation. In Fig. 4, A ₁ , A ₂ and B ₁ , B ₂ are selection switches for switching between hot or cold operation, and Th-
H ₁ , Th-C ₁ and Th-H ₂ , Th-C ₂ are in room A, B
This is a thermostat for controlling the room heater and refrigerator operation, and the illustration shows room A in cold operation and room B in hot operation.

According to the above circuit, the thermosynchronous switch _SW1 ,
By switching SW ₂ individually, the operation mode of the refrigerator fans FM ₁ and FM ₂ can be set to continuous operation on one side and thermo-synchronous operation on the other.
Can be set individually.

As mentioned above, this invention has a circuit configuration in which one thermo-synchronized switch is installed in each product storage fan for each product storage. It is possible to control the operation of each of the fans in the warehouse by setting each one to an optimal operation mode according to the operating status of the product storage at that time.

[Brief explanation of the drawing]

FIG. 1 is a principle circuit diagram of a thermosynchronous switch, FIGS. 2 and 3 are principle diagrams showing the conventional control system and the control system of this invention, respectively, and FIG. 4 is a circuit diagram of an embodiment of this invention. A, B...Product storage, _H1 , _H2 ...Heater,
MC... Refrigerator compressor, EV ₁ , EV ₂ ...
Cooler, FM ₁ , FM ₂ ...Interior fan, SW ₁ , SW ₂
...Thermo synchronization switch.

Claims (1)

[Scope of utility model registration request] It has multiple product storage compartments, each with a built-in heater, refrigerator cooler, and internal fan, and either the heater or the refrigerator can be selected for each product storage compartment depending on its hot or cold operation mode. At the same time, in the operation control circuit of the hot-or-cold product vending machine, which is configured to control the operation of the heater and refrigerator using the thermostat for controlling the internal temperature, the internal fan is set to continuous operation mode or the thermostat for controlling the internal temperature. Operation control of a hot-or-cold product vending machine, characterized in that a thermo-synchronized switch for selectively switching to one of the energy-saving operation modes that controls the operation in synchronization with the product storage area is provided individually for each product storage. circuit.