JP4238344B2 - Vending machine cooling system - Google Patents

Description

  The present invention relates to a vending machine that cools or heats products such as beverages in containers such as cans, bottles, packs, and PET bottles for sale.

  Conventionally, as a cooling control device for this type of vending machine, refrigerant evaporating that is installed in each of a plurality of product storage chambers for storing products to be sold and evaporates a refrigerant to cool the products to generate cold heat. A compressor that pressurizes and compresses the refrigerant that has been evaporated by the refrigerant evaporator to a low pressure, a refrigerant condenser that cools the refrigerant that has been compressed by the compressor and that has become high temperature, A distributor that divides the flow into the condenser, a decompression device that is connected downstream of the distributor and decompresses the refrigerant that has been compressed by the compressor, and a series connection circuit of the evaporator and the decompression device in series. Solenoid valves connected to open and close the refrigerant flow path to the evaporator, and circulation air is generated by circulating the air in the product storage room in order to transmit the cold heat generated by the evaporator to the product. Do And a temperature sensor that outputs a temperature signal of a product storage chamber necessary for opening / closing the solenoid valve and operating / stopping the compressor in response to the temperature of the product. In response to the electrical signal, the control device is configured to output a signal for opening / closing the solenoid valve and operating / stopping the compressor.

When the temperature of each circulating air reaches an allowable lower limit value (for example, 4 ° C., hereinafter referred to as “OFF temperature”), the control device closes each electromagnetic valve, and each circulating air temperature has an allowable upper limit value (for example, When the temperature reaches 8 ° C. (hereinafter referred to as “ON temperature”), the respective solenoid valves are opened, and when all the solenoid valves are closed, the compressor is stopped. When the condition is released, the compressor is restarted.
In this type of cooling operation control, if the difference between the highest product storage room temperature and any other product storage room temperature exceeds a preset allowable temperature difference (eg, 3 degrees) A cooling device that closes any one of the electromagnetic valves is known. (For example, Patent Document 1)
As a result, the temperature of any product storage room can be made substantially the same, and the amount of heat entering the product storage room from the outside air that is proportional to the temperature difference between the product storage room and the outside air can be stored in the product storage room. It can be almost the same as the chamber (and therefore has the least amount of intrusion heat), eliminating the consumption of extra energy and allowing energy savings.

In addition, as an improved cooling operation control, cooling operation is performed with a smaller number of evaporators (for example, two) than the number of product storage rooms (for example, three rooms) to be cooled. The operation of the evaporator for the room with the lowest internal temperature is suspended and the operation for the evaporator of the other room is performed, and the operation of the evaporator is alternately switched according to the change in the internal temperature, and the two-chamber cooling operation is performed. Cooling devices are known. (For example, Patent Document 2)
The cooling operation mode of this type of vending machine is a mode in which product storage rooms are divided into multiple rooms (mostly three rooms) with heat insulating walls, and all three rooms are cooled according to seasonal demand ( (Hereinafter referred to as CCC mode) The cooling operation mode is switched to the cooling heating operation mode in which the two chambers are cooled and the one chamber is heated. During the year, one room is cooled and two rooms are heated in winter, two rooms are cooled and one room is heated in spring and autumn, and all three rooms are cooled in summer.
Japanese Patent Laid-Open No. 5-258164 (page 7, FIG. 8) JP-A-5-258164 (page 4, FIG. 1)

However, with this type of cooling control method, once all the product storage rooms have reached the OFF temperature and the beverage product in the product storage room has been cooled to an appropriate temperature, the cooling operation is stopped and the beverage enters by the heat entering from the outside air. The product rises, but the cooling operation is not resumed unless the temperature of all the product storage rooms exceeds the ON temperature. If there is a difference in the volume of each product storage room and the cooling capacity of the evaporator, the temperature of the product storage room that first reached the OFF temperature will rise significantly by the next cooling start time, and the beverage product will have the proper temperature. May exceed the range.
For example, a case as shown in FIG. 13 occurs. FIG. 13 is a time chart showing cooling operation control in the CCC mode of a vending machine having three product storage rooms to which the prior art is applied. In the figure, the temperature changes of the chamber temperatures 15A, 15B, 15C of the three product storage rooms (left chamber, middle chamber, right chamber) are shown in the upper part, and the corresponding solenoid valves 3a, 3b are shown in the lower part. 3c shows the open / close state of 3c and the ON / OFF state of the compressor operation. The cooling operation is resumed at time t ₀ when the temperature in all the three rooms exceeds the ON temperature. From time t _{0 to} time t ₄ until cooling is reached, the cooling operation of the room having the lowest temperature among the chamber temperatures in each chamber is interrupted and the two-chamber cooling operation is advanced. At time t _4, the inside temperature 15B of the middle chamber reaches a OFF temperature LV, and RV is continued continuously cooling operation. At time t _4, the cooling operation when the inside temperature 15C of the right and left chamber reaches the OFF temperature only commodity storage chamber 15C is continued, at time t _10, the cooling operation and the internal temperature 15A of the left chamber reaches the OFF temperature Pause. At time t ₁₅ after each commodity storage chamber has heat penetration from the outer wall, the internal temperature to rise. At time t ₁₅ , when the temperature inside all the product storage rooms exceeds the ON temperature, the cooling operation is restarted and the above operation is repeated, and the beverage products in each product storage room are kept at a certain range of temperatures. It is. However, as is clear from FIG. 13, when the time until the product storage room that finally reached the OFF temperature reaches the ON temperature is long, the temperature of the product storage room that first reached the OFF temperature Exceeding the proper temperature range.

This phenomenon is likely to occur when there is a large difference in the cooling and heat dissipation characteristics of the three-room product storage. For example, the left and right product storage chambers have one wall in contact with the outside air as compared to the center product storage chamber, and therefore the cooling mode changes depending on the outside air temperature conditions. Specifically, when the outside air temperature is high, the amount of heat entering the product storage room increases, the cooling rate decreases, and the temperature of the beverage product after cooling is likely to rise. The opposite is true when the outside air temperature is high. For this reason, it is conceivable to improve the heat insulation performance of both side walls, but this increases the product cost.
The present invention has been made in view of the above points, and an object of the present invention is to provide a vending machine cooling device that can always maintain a beverage product within a range of an appropriate temperature and can keep product costs low. And

In order to achieve the above object, a vending machine according to claim 1 of the present invention is installed in each of a plurality of product storage rooms for storing products to be sold and evaporates a refrigerant to cool the products. A refrigerant evaporator that generates cold heat, a compressor that is installed downstream of these refrigerant evaporators and that compresses and compresses the refrigerant evaporated by the refrigerant evaporator to a low pressure, and a refrigerant to each of the refrigerant evaporators A plurality of solenoid valves each capable of opening and closing the flow path, a temperature detection means provided for each product storage chamber for detecting the temperature in the product storage chamber, and the solenoid valve receiving a detection signal from these temperature detection means a closing and cooling device for the automatic vending machine provided with a control means for controlling the operation / stop of the compressor, said control means have a run vaporizer count determination unit that controls the number of operating the evaporator and, to cool the whole commodity storage room In the cooling device for the automatic vending machine for operation control in one small evaporator than full evaporator in rolling mode, the control means further evaporator number of room is operated after reaching the OFF temperature after a predetermined time The operation is reduced by one, and the operation of the compressor is stopped when all the product storage rooms reach the OFF temperature .

The vending machine according to claim 2 of the present invention is installed in each of a plurality of product storage chambers for storing products to be sold and evaporates a refrigerant to cool the product to generate cold heat. , A compressor that is installed downstream of these refrigerant evaporators and compresses and compresses the refrigerant that has been evaporated by the refrigerant evaporator to a low pressure, and a refrigerant flow path to each of the refrigerant evaporators can be opened and closed. A plurality of solenoid valves, temperature detection means provided for each product storage chamber for detecting the temperature in the product storage chamber, and opening and closing of the solenoid valves in response to detection signals from these temperature detection means and the compressor A cooling device for a vending machine comprising control means for controlling operation / stop, wherein the control means has an operation evaporator number determination unit for controlling the operation number of the evaporator , and stores all product storage rooms. All evaporators in cooling mode In the cooling device for the automatic vending machine for operation control at remote one small evaporators, said control means room is directed to all commodity storage chamber and reaches the ON temperature after reaching the OFF temperature operation It is characterized by operating with a reduced number of evaporators.

The vending machine according to claim 2 of the present invention is installed in each of a plurality of product storage chambers for storing products to be sold and evaporates a refrigerant to cool the product to generate cold heat. , A compressor that is installed downstream of these refrigerant evaporators and compresses and compresses the refrigerant that has been evaporated by the refrigerant evaporator to a low pressure, and a refrigerant flow path to each of the refrigerant evaporators can be opened and closed. A plurality of solenoid valves, temperature detection means provided for each product storage chamber for detecting the temperature in the product storage chamber, and opening and closing of the solenoid valves in response to detection signals from these temperature detection means and the compressor A cooling device for a vending machine comprising control means for controlling operation / stop, wherein the control means has an operation evaporator number determination unit for controlling the operation number of the evaporator , and stores all product storage rooms. All evaporators in cooling mode In the cooling device for the automatic vending machine for operation control at remote one small evaporators, said control means, when the room is the difference in-compartment temperature of the other chamber from reaching the OFF temperature exceeds a predetermined temperature total It operates by reducing the number of evaporators operated for all product storage rooms.

  According to the vending machine cooling apparatus according to the present invention, even in a vending machine configured with a product storage having different cooling performance and heat dissipation performance, a predetermined time after one room reaches the OFF temperature. In order to accelerate cooling by further reducing the number of evaporators in the remaining chambers and concentrating the refrigerant to accelerate cooling, the remaining chambers quickly reach the OFF temperature, reach the initial OFF temperature, and store the products that have stopped the cooling operation The temperature of the room is prevented from rising abnormally, the beverage product can always be kept within the range of the appropriate temperature, and the heat insulation structure is not newly strengthened, so the product cost can be kept low. Play.

Exemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this embodiment.
(Embodiment 1) FIGS. 1 to 5 show a vending machine according to a first aspect of the present invention. 1 is a front view of the vending machine, FIG. 2 is a cross-sectional view of the vending machine, FIG. 3 is a refrigerant circuit, FIG. 4 is a control block diagram, and FIG. 5 is a flowchart of the main part of cooling control.
1 and 2, reference numeral 1 denotes a main body cabinet of a vending machine that becomes a heat-insulating housing, 2 denotes a partition wall that partitions the product storage chamber 3 at the top of the main body cabinet into three product rooms 3A to 3C, and 4 denotes a product. The product stored in the product storage rack 5 suspended indoors is shown. Reference numerals 6 to 13 denote components of the cooling unit disposed on the lower side of the main body cabinet 1, and reference numeral 6 denotes an evaporator, which is disposed one by one corresponding to each of the commodity rooms 3A to 3C, and is indicated as 6A to 6C. , 7 is a condenser, 8 is a compressor, 9 is an accumulator for storing unevaporated liquid refrigerant, 10 is a cavity, and each component is connected by a refrigerant pipe 11. Further, 12 is an evaporator fan for blowing cold heat from the evaporator to the product room, 13 is a condenser fan for exhausting heat from the condenser, 14 is a heater for heating the product in the product room, and 15 is a product. The inside temperature sensor which detects indoor temperature is shown. Reference numeral 16 denotes a circulation duct for returning the air that has cooled / heated the product in the product room to the evaporator / heater, and 17 is a shooter that rolls and conveys the sold product to a product sales port 19 installed below the outer door 18. In order to send the cool air discharged from the evaporator to the product, a large number of holes are formed. Reference numeral 20 denotes an inner door that is made of a heat insulating material and prevents heat from flowing into and out of the outside air.

FIG. 3 is a cooling circuit diagram shown together with the control circuit of the cooling device of the vending machine corresponding to FIGS. In FIG. 3, 21 is an electromagnetic valve for stopping the transfer of the liquid refrigerant from the condenser 7 to the evaporators 6A to 6C in the respective product chambers, indicated as 21A to 21C corresponding to the respective evaporators. The internal temperature sensor is also indicated as 15A to 15C. Reference numeral 100 denotes a control device that receives a temperature signal from the temperature sensors 15A to 15C and outputs a signal for opening / closing the electromagnetic valves 21A to 21C and operating / stopping the compressor 8. Reference numeral 110 denotes an operation mode setting switch for setting and inputting a combined operation mode of cooling or heating for each of the commodity rooms 3A to 3C to the control device 100.
FIG. 4 is a control block diagram according to the control device 100. A determination unit and a command unit indicated by 101 to 104 are incorporated in the control device 100.
101 is an operation evaporator number determination unit for determining the number of evaporators to be operated, 102 is an electromagnetic valve switching change determination unit for determining whether to change opening / closing of the electromagnetic valve, and 103 is to change opening / closing of the electromagnetic valve An electromagnetic valve opening / closing change determination unit 104 for determining whether or not is an electromagnetic valve opening / closing change command unit for instructing an electromagnetic valve to be changed.
More specifically, the operation evaporation number determination unit 101 detects the internal temperature as shown in Table 1, and the predetermined time t after the internal temperature of one of the cooling chambers reaches the OFF point temperature. Until the _offs (for example, 30 minutes), the number of evaporators is set to N2 (for example, two), and when the predetermined time _toffs has elapsed, the number of evaporators is reduced and set to N1 (for example, one).

Table 1 Operation evaporator number judgment section

As shown in Table 2, the solenoid valve switching change unit 102 detects the time from the previous change, and if it is shorter than the set interval time ts (for example, 15 minutes), the state is continued without being changed. If so, raise a flag for change.
Table 2 Solenoid valve switching change judgment part

As shown in Table 3, the electromagnetic valve opening / closing change determination unit 103 determines whether the electromagnetic valve is open or closed based on the results of the operation evaporation number determination and the electromagnetic valve switching change determination. When the operation evaporation number determination is N1 (one), the solenoid valve opening / closing is always changed, and when the operation evaporation number determination is N2 (two), the result of the electromagnetic valve switching change determination is referred to. If the solenoid valve switching change determination is changed, the solenoid valve opening / closing is changed. If the solenoid valve switching change determination is continued, the solenoid valve opening / closing is continued if continued.
Table 3 Solenoid valve open / close judgment part

In the solenoid valve opening / closing change command unit 104, when the change command flag is set by the solenoid valve opening / closing change determination unit 103, the solenoid valve of the cooling product room having a high internal temperature is opened and the electromagnetic of the product room having a low internal temperature is opened. Close the valve.
In a vending machine having four cooling product rooms, when N2 = 2 is set, the two solenoid valves in the cooling product room are opened in order from the highest internal temperature, and the remaining low internal temperature products. Close the solenoid valves in the chambers (in this case, the remaining two chambers). Similarly, when N2 = 3 is set, the three solenoid valves in the cooling product room are opened in order of increasing inside temperature, and the remaining solenoid valves in the product room having the low inside temperature (in this case, the remaining one). Close.
In this configuration, the cooling control operation will be described with reference to the flowchart of FIG.
When the vending machine is turned on, the compressor starts operation (S1), counts the number of cooling chambers to be operated in the operation mode (S2), and returns to the beginning without performing the following control if the number is less than three ( If it is 3 or more rooms (S2 branch Y) (S2 branch N), the internal temperature of the cooling room is read (S3). When it is detected that the product storage room has reached the OFF temperature from the read internal temperature, the solenoid valve corresponding to the product storage room is closed, the OFF temperature start time timer (not shown) is activated, and the OFF point is achieved. The counter for the number of rooms is added (S4). Next, in the determination of the operation evaporation number, as shown in Table 1, the number of evaporators is set to N2 (for example, 2 for a predetermined time t _offs (for example, 30 minutes) after the inside temperature of one room reaches the OFF point temperature. When the predetermined time t _offs has elapsed, the number of evaporators is reduced and set to N1 (for example, 1) (S5).

Next, as shown in Table 2, the change time from the previous time is compared, and when the set interval time ts (for example, 15 minutes) is exceeded, a flag is set in the change setting (S6). Next, as shown in Table 3, the electromagnetic valve opening / closing changing unit determines whether to change or continue the ON / OFF state of the electromagnetic valve based on the result of the operation evaporation number determination and the electromagnetic valve switching determination unit (S7). If the solenoid valve continues to be turned on / off in step S7, the process returns to the beginning (S7 branch N), and when it is changed (S7 branch Y), the solenoid valve with the low internal temperature is closed and the high solenoid The valve is opened (S8).
Next, it is determined whether all the product storage rooms have reached the OFF point (S9). If all the product storage rooms have not reached the OFF point, the process returns to the beginning (S9 branch N), and all the product storage rooms are When the OFF point is reached (S9 branch Y), the number of OFF point achievement rooms is reset (S10) and the process returns to the beginning.
Next, an example in which the control method of the present invention is applied to the case of the conventional example shown in FIG. 13 is shown by the time chart of FIG. In the figure, up to the time t ₀ after the time t ₄ cooling prior art as well as suspended two-chamber cooling the cooling operation of the low-temperature chamber in the chambers of the internal temperature at each interval time Continue driving. At time t ₄ , the number of rooms that have achieved the OFF point is counted as 1 in step S ₄ , and cooling of the product storage rooms 3 A and 3 C is continued. N1 evaporator number determination unit when the elapsed time t ₆ exceeding the set time t _s at step S5 (in this case one) is determined as the product storage chamber 3A, a high chamber ones-compartment temperature of 3C Cooling is performed, and a one-chamber cooling operation is started in which a room having a low internal temperature stops cooling. Thereafter, each room is continued until the temperature reaches the OFF temperature, and when the temperature inside all the product storage rooms reaches the OFF temperature (time t ₁₄ ), the number of rooms for achieving the OFF point is reset in step S10, and the initial state Return to.

If such a cooling operation is performed, one room operation is performed after the set time elapses, and the time for the product storage room temperature to reach the OFF temperature is shortened. The cooling operation can be stably performed without abnormally rising.
(Embodiment 2) FIGS. 7 and 8 show a cooling control block diagram and a main part flowchart relating to the form of the vending machine according to the second aspect of the present invention. The difference from the first embodiment is that in the operation evaporation number determination, the product storage chamber reaches the ON point again instead of performing the one-room operation by determining the elapsed time from the time when the OFF temperature is first reached. It is a point that the two-chamber operation was sometimes performed for all rooms. More specifically, in the operation evaporation number determination unit 1011 and step S51, as shown in Table 4, after the inside temperature of one room in the product storage room reaches the OFF point temperature, the ON point is again set. Until the time t _on is reached, the product storage rooms that are subject to cooling control are group Gr2 that have not reached the OFF point temperature. When the time t _on when the commodity storage chamber reaches the ON point again has elapsed first, the group Gr3 is set for which all the chambers are subject to cooling control.

Table 4 Operation Evaporator Number Judgment Unit (2)

Further, the solenoid valve switching changing unit 102 is the same as that of the first embodiment, and the description thereof is omitted.
In the electromagnetic valve opening / closing change determination unit 1031 and step S71, as shown in Table 5, the electromagnetic valve opening / closing change determination is performed based on the results of the operation evaporation number determination and the electromagnetic valve switching change determination. If the operation evaporation number determination is Gr2, the product storage room is targeted after reaching the OFF point temperature, and if it is Gr3, all product storage rooms are targeted. If the solenoid valve switching change determination is changed, the solenoid valve opening / closing is changed. If the solenoid valve switching change determination is continued, the solenoid valve opening / closing is continued if continued.
Table 5 Solenoid valve open / close judgment part (2)

In the solenoid valve opening / closing change command unit 1041 and step S81, if the change flag is set in the solenoid valve opening / closing change determination unit 103 when the operation evaporator number determination is Gr2, the electromagnetic of the cooling product room having a high internal temperature is stored. Open the valve and close the solenoid valve in the product room where the internal temperature is low. However, in the case of a three-room machine, the number of target rooms is 2, so the cooling operation is continued in both the two rooms. However, in the case of a four-chamber machine, the number of target rooms is three even in the case of Gr2. Therefore, as described above, the solenoid valve of the cooling product room having a high internal temperature is opened, and the product room having a low internal temperature. Close the solenoid valve. Further, when the number of operating evaporators is determined as Gr3, a room that has once reached the OFF temperature is also subject to control, and if the change command flag is set in the solenoid valve opening / closing change determination unit 103, cooling with a high internal temperature is performed. Open the solenoid valve in the product room, and close the solenoid valve in the product room where the internal temperature is low.
Others are the same as those of the first embodiment, and those having the same configuration are denoted by the same reference numerals and description thereof is omitted.

Next, an example in which the control method of the present invention is applied to the case of the conventional example shown in FIG. 13 is shown by the time chart of FIG. In the figure, up to the time t ₀ after the time t ₁₀ cooling prior art as well as suspended two chambers operated cooling the cooling operation of the low-temperature chamber in the chambers of the internal temperature at each time interval To proceed. At time t ₄ , the number of rooms that have achieved the OFF point is counted as 1 in step S ₄ , and cooling of the product storage rooms 3 A and 3 C is continued. Is all determined commodity storage chamber 3B inside temperature cooling control object in the evaporator count determination unit in step S51 after a lapse of the time t ₁₀ exceeding the ON temperature of Gr3, commodity storage chamber 3A, 3B, among the 3C Cooling is stopped in the room having a low internal temperature, and cooling is continued in the other product storage rooms. Later, is continued until each chamber is OFF temperature, the inside temperature of all commodity storage chamber reaches the OFF temperature (time t ₁₅ too) and chamber number of OFF point achieved is reset in step S10, the start Return to state.

If such a cooling operation is performed, the cooling operation is started again when the internal temperature of the product storage room that has first reached the OFF temperature reaches the ON temperature. Therefore, the storage of the product storage room is further compared to the first embodiment. The cooling operation can be operated stably without abnormally increasing the internal temperature.
(Embodiment 3) FIGS. 10 and 11 show a cooling control block diagram and a main part flowchart of a vending machine according to a third aspect of the present invention. The difference from the second embodiment is that in the operation evaporation number determination of the group for all the rooms, the temperature inside the product storage chamber that has reached the OFF temperature instead of the time when the product storage chamber reaches the ON point again. This is a point to be performed when the internal temperature of the other chamber is compared and the difference reaches or exceeds the set value ΔTs. More specifically, the operation evaporation number determination unit 1012 detects the internal temperature as shown in Table 6, and the internal temperature after the internal temperature of one of the cooling chambers reaches the OFF point temperature is shown. Group Gr2 until the temperature difference ΔTk in the other product storage chamber is within a set value ΔTs (for example, 2 degrees), that is, until the internal temperature of the room at the OFF point temperature is higher than the temperature in the other room by ΔTs. . If the temperature difference is exceeded, the group Gr3 is set for which all the rooms are subject to cooling control.

Table 6 Operation evaporator number judgment part (3)

Others are the same as those in the second embodiment, and those having the same configuration are denoted by the same reference numerals and description thereof is omitted.
Next, an example in which the control method of the present invention is applied to the case of the conventional example shown in FIG. 13 is shown in the time chart of FIG. Those in the figure, first, the ranging time t ₀ after the time t ₈ the cooling is the same as the second embodiment described. When the time t ₈ when the internal temperature of the product storage room 15B is higher than the lowest internal temperature 15C than the set value ΔTs has elapsed, in step S52, the number of evaporators determination unit sets all the cooling control targets for the group Gr3. Is determined, and the lowest chamber among the chamber temperatures 15A, 15B, and 15C in the product storage room stops cooling, and the other product storage rooms continue cooling. Later, continues until the time chambers is OFF temperature, the inside temperature of all commodity storage chamber reaches the OFF temperature (time t ₁₃ before) and chamber number of OFF point achieved is reset in step S10, the start Return to the state.

  If such a cooling operation is performed, the cooling operation is started again in such a manner that the temperature inside the product storage room that first reaches the OFF temperature does not increase the temperature difference from the other chambers. However, it is possible to operate the cooling operation stably without further abnormally increasing the temperature inside the product storage room.

It is a front view of the vending machine which shows Embodiment 1-3 of the vending machine by this invention. It is a cross-sectional view of the vending machine which shows Embodiment 1-3 of the vending machine by this invention. It is a refrigerant circuit which shows Embodiment 1-3 of the vending machine by this invention. It is a control block diagram which shows Embodiment 1 of the vending machine by this invention. It is a flowchart of the principal part of the cooling control which shows Embodiment 1 of the vending machine by this invention. It is an example of the time chart of the cooling control which shows Embodiment 1 of the vending machine by this invention. It is a control block diagram which shows Embodiment 2 of the vending machine by this invention. It is a flowchart of the principal part of the cooling control which shows Embodiment 2 of the vending machine by this invention. It is an example of the time chart of the cooling control which shows Embodiment 2 of the vending machine by this invention. It is a control block diagram which shows Embodiment 3 of the vending machine by this invention. It is a flowchart of the principal part of the cooling control which shows Embodiment 3 of the vending machine by this invention. It is an example of the time chart of the cooling control which shows Embodiment 3 of the vending machine by this invention. It is an example of the time chart of the cooling control by the conventional vending machine.

Explanation of symbols

3 Commodity Storage Room 4 Commodity 6 Evaporator 7 Condenser 8 Compressor 21 Solenoid Valve 81 Compressor Protection Device 100 Control Device 101 Operation Evaporator Number Determination Unit 102 Solenoid Valve Change Change Unit 103 Solenoid Valve Open / Close Change Determination Unit 104 Solenoid Valve Open / Close Change Command

Claims (3)

A refrigerant evaporator that is installed in each of a plurality of product storage chambers for storing products to be sold and generates cold by evaporating a refrigerant to cool the products;
A compressor that is installed downstream of these refrigerant evaporators and pressurizes and compresses the refrigerant that has been evaporated by the refrigerant evaporator to a low pressure;
A plurality of solenoid valves each capable of opening and closing the refrigerant flow path to each refrigerant evaporator;
Temperature detection means provided for each product storage chamber for detecting the temperature in the product storage chamber;
A cooling device for an automatic vending machine provided with a control means for controlling the receiving detection signal off and the operation / stop of the compressor of the solenoid valve from these temperature detecting means,
The control means has an operation evaporator number determination unit for controlling the operation number of the evaporators , and performs automatic control for operation control with one less evaporator than all evaporators in an operation mode for cooling all product storage rooms. In the cooling device of the machine ,
The control means operates by further reducing the number of evaporators operated after a predetermined time after one room reaches the OFF temperature, and stops the operation of the compressor when all the product storage rooms reach the OFF temperature. A vending machine cooling device characterized by: A refrigerant evaporator that is installed in each of a plurality of product storage chambers for storing products to be sold and generates cold by evaporating a refrigerant to cool the products;
A compressor that is installed downstream of these refrigerant evaporators and pressurizes and compresses the refrigerant that has been evaporated by the refrigerant evaporator to a low pressure;
A plurality of solenoid valves each capable of opening and closing the refrigerant flow path to each refrigerant evaporator;
Temperature detection means provided for each product storage chamber for detecting the temperature in the product storage chamber;
A cooling device for an automatic vending machine provided with a control means for controlling the receiving detection signal off and the operation / stop of the compressor of the solenoid valve from these temperature detecting means,
The control means has an operation evaporator number determination unit for controlling the operation number of the evaporators , and performs automatic control for operation control with one less evaporator than all evaporators in an operation mode for cooling all product storage rooms. In the cooling device of the machine,
The control means operates by reducing the number of evaporators operated for all product storage rooms when one room reaches the ON temperature after reaching the OFF temperature. Cooling system. A refrigerant evaporator that is installed in each of a plurality of product storage chambers for storing products to be sold and generates cold by evaporating a refrigerant to cool the products;
A compressor that is installed downstream of these refrigerant evaporators and pressurizes and compresses the refrigerant that has been evaporated by the refrigerant evaporator to a low pressure;
A plurality of solenoid valves each capable of opening and closing the refrigerant flow path to each refrigerant evaporator;
Temperature detection means provided for each product storage chamber for detecting the temperature in the product storage chamber;
A cooling device for an automatic vending machine provided with a control means for controlling the receiving detection signal off and the operation / stop of the compressor of the solenoid valve from these temperature detecting means,
The control means has an operation evaporator number determination unit for controlling the operation number of the evaporators , and performs automatic control for operation control with one less evaporator than all evaporators in an operation mode for cooling all product storage rooms. In the cooling device of the machine,
The control means operates by reducing the number of evaporators that are operated for all product storage rooms when the difference in the internal temperature with the other rooms exceeds a predetermined temperature after one room reaches the OFF temperature. A vending machine cooling device characterized by:

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