JP2001109942A - Automatic vending machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic vending machine which can overcome the lack of heating while reducing the running cost through the use of waste heat generated by cooling. SOLUTION: A compressor 52, a heat source side unit 31 having a heat source side heat exchanger 53 and a use side unit 30B having a use side heat exchanger 43B are arranged. The heat source side heat exchanger is branched and connected to the refrigerant discharge pipe 32 and the refrigerant suction pipe 33 of the compressor through switch valves 34A and 34B. A high pressure gas pipe 36 which is branched/connected to the refrigerant discharge pipe, a low pressure gas pipe 37 branched/connected to the refrigerant suction pipe and a liquid pipe 38 connected to the heat source side heat exchanger are installed. The individual use side heat exchangers are branched and connected to the high pressure gas pipe and the low pressure gas pipe through switch valves 39A and 39B. The use side units are installed in the respective cases of an automatic vending machine. Auxiliary electric heaters 46B and 46C are arranged in the cases.

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 cooling or heating products such as canned beverages for sale.

[0002]

2. Description of the Related Art In a conventional vending machine, a product storage is formed in a main body composed of a heat insulating box, and the product storage is divided into a plurality of storages. Then, the inside of the refrigerator storing the products to be cooled is cooled by a well-known refrigeration cycle,
The interior of the storage for storing the products to be heated was heated by an electric heater.

[0003]

As described above, conventionally,
An electric heater is used as a heating means, and an enormous amount of electricity is required to obtain the amount of heat required for heating. In particular, since the inside of the cooling chamber and the inside of the heating chamber coexist, heat on the heating side by the electric heater is inevitably leaked into the cooling chamber, and excessive heat is leaked to the outside by the amount of heat leaked in the refrigeration cycle. Had to be released. As a result, the refrigeration cycle must be operated excessively, causing a problem that the running cost rises more than necessary.

[0004] In order to avoid such a rise in running cost, it is conceivable to heat the inside of the heating side with waste heat generated in the refrigeration cycle. However, only the waste heat generated in the refrigeration cycle causes a problem that the inside of the storage on the heating side cannot be sufficiently heated.

[0005] That is, the heating capacity of the use side heat exchanger is particularly affected by the outside air temperature, and when the outside air temperature is low, it is not possible to obtain a sufficient amount of heat required for heating, and the product becomes There is a problem that it takes more time than necessary to reach a temperature at which it can be sold.

The present invention has been made to solve the above-mentioned conventional technical problems, and can cope with insufficient heating while realizing a reduction in running costs by utilizing waste heat generated by cooling. Vending machines.

[0007]

The vending machine of the present invention comprises:
Commodity storage in a main body consisting of an insulated box, dividing this product storage into a plurality of storages, and cooling or heating the products put in each storage and selling them from sales outlets A heat source side unit having a compressor and a heat source side heat exchanger, and a plurality of use side units having a use side heat exchanger, wherein the heat source side heat exchanger is a refrigerant discharge pipe of the compressor and a refrigerant While branch-connected to the suction pipe via a switching valve,
A piping between the units connecting these two units is composed of a high-pressure gas pipe branched and connected to the refrigerant discharge pipe, a low-pressure gas pipe branched and connected to the refrigerant suction pipe, and a liquid pipe connected to the heat source side heat exchanger. At the same time, cooling is performed by branch-connecting each use-side heat exchanger disposed in the refrigerator to a high-pressure gas pipe and a low-pressure gas pipe via a switching valve, and connecting to a liquid pipe via a refrigerant pressure reducer. It is characterized by comprising a heating device and an auxiliary electric heater provided in the storage.

According to the present invention, a product storage is formed in a main body composed of a heat insulating box, the product storage is partitioned into a plurality of storages, and the products put in each storage are cooled or heated. In a vending machine to be warmed and sold from a sales outlet, a heat source side unit having a compressor and a heat source side heat exchanger, and a plurality of use side units having use side heat exchangers respectively arranged in each storage. The heat source side heat exchanger is branched and connected to a refrigerant discharge pipe and a refrigerant suction pipe of a compressor via a switching valve, and an inter-unit pipe connecting these two units is branched and connected to the refrigerant discharge pipe. A high-pressure gas pipe, a low-pressure gas pipe branched and connected to a refrigerant suction pipe, and a liquid pipe connected to a heat source-side heat exchanger, and each use-side heat exchanger is composed of a high-pressure gas pipe and a low-pressure gas pipe. Branch connection via a switching valve Since a cooling and heating device connected via a quantity control valve is provided, each storage unit using a plurality of use-side heat exchangers has a simple circuit configuration using a single-function heat source-side heat exchanger. In addition to the simultaneous cooling operation or the heating operation in the inside, the simultaneous cooling / heating operation in each storage can be freely selected and performed by an arbitrary user-side unit.

In the simultaneous operation of cooling and heating in each storage, the use side heat exchanger acting as a condenser and the heat source side heat exchanger acting as an evaporator are connected in series. Efficient operation by recovery can be performed, and the running cost can be significantly reduced.

[0010] In particular, since the auxiliary electric heater is provided in the refrigerator, the reduction of the outside air temperature reduces the effect of the use side heat exchanger used as a heating device as a condenser on the auxiliary electric heater. Can be effectively supplemented. Thus, it is possible to reduce the power consumption while realizing the heating of the product without any trouble.

A vending machine according to a second aspect of the present invention is characterized in that, in the above, the use side unit includes a blower, and an auxiliary electric heater is provided on the leeward side of the blower.

According to the second aspect of the present invention, in addition to the above, the use side unit is provided with a blower and an auxiliary electric heater is provided on the leeward side of the blower, so that the cooled or heated air is stored by the blower. The inside of the refrigerator can be efficiently cooled or heated. In particular, since the auxiliary electric heater is installed on the lee side of the blower, the heated air can be forced to circulate in the refrigerator, reducing the inconvenience of heat leaking into the adjacent refrigerator. Will be able to do that.

A vending machine according to a third aspect of the present invention is characterized in that, in the above, the auxiliary electric heater is energized when the inside of the storage by the use side heat exchanger is insufficiently heated.

According to the third aspect of the present invention, in addition to the above, the auxiliary electric heater is energized when the inside of the compartment is insufficiently heated by the use side heat exchanger, so that the waste heat of the heat source side heat exchanger is Is used preferentially to heat the inside of the refrigerator, and the insufficient amount of heat can be supplemented by the auxiliary electric heater, thereby enabling efficient operation.

In the vending machine according to the fourth aspect of the present invention, the auxiliary electric heater is controlled by the control device, and the input side of the control device has an outside air temperature, a discharge gas temperature, a refrigerant high pressure, and a refrigerant condensing temperature. The auxiliary electric heater is energized when at least one of the outside air temperature, the discharge gas temperature, the refrigerant high pressure, and the refrigerant condensing temperature is equal to or less than a set value. It is characterized by.

According to the fourth aspect of the present invention, in addition to the above, the auxiliary electric heater is controlled by the controller, and the input side of the controller is connected to the outside air temperature, the discharge gas temperature, the refrigerant high pressure, the refrigerant condensing temperature. At least one of the detecting means is connected, the outside air temperature, the discharge gas temperature, the refrigerant high pressure,
When at least one of the refrigerant condensing temperatures becomes equal to or less than the set value, the auxiliary electric heater is energized, so that the state of the high-temperature and high-pressure refrigerant flowing into the use-side heat exchanger is determined by the outside air temperature and discharge. It accurately grasps at least one of the gas temperature, the refrigerant high-pressure pressure, and the refrigerant condensing temperature, determines the capacity of the use side heat exchanger, and supplements the necessary amount of heat with the auxiliary electric heater. It is.

[0017]

Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view of a vending machine 1 as an embodiment of the present invention, FIG. 2 is a front view of the vending machine 1 excluding a front door 3 and a heat insulating door 4, and FIG. is there.

The vending machine 1 of the embodiment is for cooling or heating and selling canned beverages. A main body 2 composed of an insulated box body opened on the front surface, and a pivotal support for one side of the main body 2 is provided. And an openable front door 3. The front door 3 is provided with a product display 6 on which a plurality of product samples S are displayed. In the lower right corner of the product display 6, a bill insertion slot 7, a cash indicator 8, a coin insertion slot 9 are provided. , A coin return slot 11, a return lever 12, and a key 13 are provided. Also, on the front of the product display 6,
A selection button 14 is provided corresponding to the lower side of each product sample S, and a sales port 16 is provided below the front door 3.
Is arranged.

Behind the front door 3, a heat insulating door 4 is provided at the front.
Is formed in the main body 2.
As shown in FIG. 2, the interior of the product storage 17 is partitioned into three left and right rooms by partition walls 18 and 19 filled with a heat insulating material, and a specific storage 17A is formed on the left side of the partition wall 18. In the center located between the partition wall 18 and the partition wall 19, a cooling and heating box 17B capable of selecting and switching between cooling and heating is formed, and a cooling and heating box is also provided on the right side of the partition wall 19. 17C is formed.

In the product storage 17, two rows of product racks 22 are suspended from front and rear. In this case,
The product racks 22 are stored in two rows on the left and right in the specific storage 17A having the largest capacity, and the product racks 22 are stored in one row in the cooling and heating storages 17B and 17C having about half the capacity of the specific storage 17A. .

Inside each product rack 22, there are a side plate 23 constituting an outer surface and a partition plate 24 for partitioning the inside of the product rack 22 back and forth.
Product passages 26, 26 extending in the up-down direction are formed in two rows in front and rear, respectively. In addition, each product passage 26
Are formed at the upper end thereof, and a product discharge port 28 is formed at the lower end, and a product discharge device 29 is provided at each of the product discharge ports 28 with the side plate 23 or the partition plate. 24, respectively.

Each of the merchandise carrying-out devices 29 is called an ejector mechanism (or a bend mechanism). The holding arm 29A always projects toward the merchandise passage 26 to hold the lowermost merchandise G in the merchandise passage 26. When the product is sold, the holding arm 29 is moved along the side plate 23 or the partition plate 24 by an actuator (not shown) such as a solenoid.
A is tilted to drop the products G one by one downward.

A chute 41 inclined downward and forward is disposed below the commodity rack 22. The commodity G discharged from each commodity rack 22 falls on the chute 41 and rolls. Then, it is guided from the outlet 42 of the heat insulating door 4 to the selling port 16 of the front door 3.

Below the chutes 41, corresponding to the specific storage 17A and the cooling and heating storages 17B and 17C, respectively, are a usage-side unit 30A (specific usage-side unit), a usage-side unit 30B, User side unit 3
0C, and each unit has a blower 44
A, 44B and 44C are provided.

Then, the user-side units 30B, 30
An auxiliary electric heater 4 for heating the cooling and heating chambers 17B and 17C is provided downstream of the blowers 44B and 44C of FIG.
6B and 46C are provided respectively. The auxiliary electric heaters 46B and 46C are controlled by a control device C described later.

On the other hand, the machine room 5
The heat source side unit 31 and the blower 54 are provided in the machine room 51. The heat source side unit 31 and the use side units 30A to 30A
C constitutes a cooling and heating device of the vending machine 1.

Next, a refrigerant circuit of the vending machine 1 according to the present embodiment will be described with reference to FIG. The heat source side unit 31 includes a compressor 52, a heat source side heat exchanger 53, a gas-liquid separator 55, and the like.
0A, 30B and 30C are the use side heat exchanger 43
A, 43B and 43C. The heat source side heat exchanger 53 is connected to the refrigerant discharge pipe 32 and the refrigerant suction pipe 33 of the compressor 52 by switching the switching valves 34A and 34B, while the heat source side unit 31 and the use side units 30A, 30B, 3
0C to the refrigerant discharge pipe 32
A low-pressure gas pipe 37 branched and connected to the refrigerant suction pipe 33, and a liquid pipe 38.

The use side heat exchanger 43A of the use side unit 30A is connected to the low pressure gas pipe 37,
The liquid pipe 38 is connected via a refrigerant flow control valve 47 such as an electric expansion valve. Also, the use side units 30B, 30
The use side heat exchangers 43B and 43C of the C
And switching valves 39A, 39B,
It is branched and connected via 40A and 40B, and connected to the liquid pipe 38 via refrigerant flow control valves 48 and 49 such as an electric expansion valve.

Reference numeral 50 denotes a refrigerant flow control valve such as an electric expansion valve interposed in the liquid pipe 38. Further, in this embodiment, since the specific storage 17A only performs cooling, the use side unit 3
A switching valve 3 such as the use side units 30B and 30C is provided for 0A.
9A, 39B, 40A, and 40B are not provided, but the switching valve is branched and connected to the refrigerant discharge pipe 32 and the refrigerant suction pipe 33 to heat the air, and to the leeward side of the blower 44A provided in the use side unit 30A. May be provided with an auxiliary electric heater. Further, 17A may be a dedicated storage for heating, in which case the use side heat exchanger 43A is naturally connected to the high pressure gas pipe 36A.
Will be connected.

Next, FIG. 5 shows a configuration diagram of the control device C of the vending machine 1. The control device C is constituted by a general-purpose microcomputer 56. On the input side, the selection button 14 (shown by one) of the product G and the specific storage 17A, the cooling and heating storages 17B and 17C are respectively provided. Temperature sensors 58A and 5A as attached temperature detecting means
8B, 58C, use side heat exchangers 43A, 43B, 43C
In the heat source side heat exchanger 53, temperature sensors 63A, 63B, 63C, 63 as a refrigerant evaporating temperature detecting means, and temperature sensors 62B, 62C, 62 as a condensing temperature detecting means.
Are connected, and the output side of the microcomputer 56 is connected to each of the switching valves 34A, 34B, 39A, 39A.
B, 40A, 40B, each refrigerant flow control valve 47, 48,
49, 50, the respective auxiliary electric heaters 46B, 46C, the compressor 52, the respective blowers 44A, 44B, 44C, 54, and the respective product unloading devices 29 (shown as one).

Next, the operation of the vending machine 1 having the above configuration will be described. First, the specific storage 17A, the cooling and heating storage 17B,
A case where the product is cooled using all 17C as a cooling cabinet will be described with reference to FIG. The temperature sensors 58A, 58
When the temperature detected by B, 58C is equal to or higher than the cooling set temperature, the microcomputer 56 opens the switching valve 34A of the refrigerant discharge pipe 32 of the heat source side heat exchanger 53 and turns the switching valve 34B of the refrigerant suction pipe 33 on. Closed and switching valves 39A, 40 of high-pressure gas pipe 36 of use side heat exchangers 43B, 43C
A is closed, and the switching valves 39B and 40B of the low-pressure gas pipe 37 are opened. In this case, the cooling and heating chambers 17B and 17C are provided with the auxiliary electric heaters 46B and 46C according to the present invention for cooling.
Is not energized.

Thus, the refrigerant discharged from the compressor 52 flows sequentially through the refrigerant discharge pipe 32, the switching valve 34A, and the heat source side heat exchanger 53, where it is condensed and liquefied. 38, each user side unit 30A,
The refrigerant is distributed to refrigerant flow control valves 47, 48, and 49 of 30B and 30C, where the pressure is reduced.

At this time, the microcomputer 56
Means that the refrigerant flow control valve 50 is fully opened, and that the refrigerant flow control valves 47, 48, and 49 are temperature sensors 58A, 58
The diaphragm amount is adjusted based on the outputs of B and 58C. Thereafter, the refrigerant that has passed through each of the refrigerant flow control valves 47, 48, and 49 is
After flowing into each of the use-side heat exchangers 43A, 43B, and 43C and evaporating, the use-side heat exchangers 43B and 43C provide
The gas enters the low-pressure gas pipe 37 via the switching valves 39B and 40B, and enters the low-pressure gas pipe 37 as it is from the use side heat exchanger 43A. Then, the refrigerant joined by the low-pressure gas pipe 37 is sucked into the compressor 52 through the refrigerant suction pipe 33 and the gas-liquid separator 55 in order.

Next, the specific storage 17A and the cooling and heating storage 17B
The case where the cooling and warming storage 17C is heated while cooling is cooled will be described with reference to FIG. For example, when the temperature detected by the temperature sensors 58A and 58B is equal to or higher than the cooling set temperature and the temperature sensor 58C is equal to or lower than the heating set temperature, the microcomputer 56 opens the switching valve 34A of the heat source side heat exchanger 53 and switches the switching valve 34A. The switching valve 39A of the use side heat exchanger 43B for cooling and cooling is closed, the switching valve 39B is opened, and the switching valve 40A of the use side heat exchanger 43C for heating is opened, and the switching valve 40B is closed.

Thus, a part of the refrigerant discharged from the compressor 52 passes through the high-pressure gas pipe 36 and the switching valve 40A sequentially,
The refrigerant flows into the use side heat exchanger 43C to be heated, and the remaining refrigerant flows into the heat source side heat exchanger 53 from the switching valve 34A via the refrigerant discharge pipe 32. The heat is condensed and liquefied by the use side heat exchanger 43C and the heat source side heat exchanger 53. The refrigerant condensed and liquefied in the heat exchangers 43C and 53 is depressurized by the refrigerant flow control valves 47 and 48 of the use units 30A and 30B via the liquid pipe 38, and then the respective use side heat exchangers 43A and 43B. And evaporate.

The microcomputer 56 adjusts the refrigerant flow control valves 49 and 50 based on the outputs of the temperature sensors 62C and 62, and controls the refrigerant flow control valves 47 and 48.
Is adjusted based on the outputs of the temperature sensors 63A and 63B. If the temperature of the cooling and heating chamber 17C is equal to or lower than the heating set temperature based on the output of the temperature sensor 58C, the microcomputer 56 supplies power to the auxiliary electric heater 46C to supplement the inside of the cooling and heating chamber 17C. Warm up.

Thus, when the heating inside the cooling and heating chamber 17C is insufficient with only the use side heat exchanger 43C, the auxiliary electric power is supplied based on the output of the temperature sensor 58C together with the heating by the use side heat exchanger 43C. Since the heater 46C is energized, the insufficient amount of heat can be supplemented by the auxiliary electric heater 46C while utilizing waste heat to the heat source side heat exchanger 53, and rapid heating can be performed. In addition, efficient operation can be performed.

The air heated by the use-side heat exchanger 43C and the auxiliary electric heater 46C is supplied to the cooling and heating chamber 17C.
The inside of the refrigerator is circulated by the blower 44C provided therein, so that the interior of the refrigerator can be efficiently heated.

Further, the auxiliary electric heater 46C is
Since it is installed on the leeward side of 4C, the preferentially heated air can be circulated in the cooling and heating chamber 17C,
Thereby, it is possible to reduce the leakage of heat into the adjacent storage.

The refrigerant having passed through the use-side heat exchanger 43A flows into the low-pressure gas pipe 37, and the refrigerant having passed through the use-side heat exchanger 43B flows into the low-pressure gas pipe 37 after passing through the switching valve 39B, and joins, thereby sucking the refrigerant. It is sucked into the compressor 52 through the pipe 33 and the gas-liquid separator 55 in order. In this case, since the use side heat exchanger 43C acts as a condenser in this case, the cooling and warming storage 17C is heated, and the use side heat exchangers 43A and 43B function as evaporators and the specific storage 17A and the cooling unit 17C. Heating storage 17B
Will be cooled.

Next, a case where the specific storage 17A is cooled and the cooling and heating storages 17B and 17C are heated will be described with reference to FIG. When the temperature detected by the temperature sensor 58A is equal to or higher than the cooling set temperature and the temperature sensors 58B and 58C are equal to or lower than the heating set temperature, the microcomputer 56 closes the switching valves 34A and 34B of the heat source side heat exchanger 53, and The switching valve 39A of the user side heat exchanger 43B to be heated is opened, the switching valve 39B is closed, the switching valve 40A of the user side heat exchanger 43C is opened, and the switching valve 40B is closed.

Thus, the refrigerant discharged from the compressor 52 is heated through the refrigerant discharge pipe 32 and the high-pressure gas pipe 36, and the switching valves 39A, 40 of the use side units 30B, 30C are switched.
A flows into each of the use side heat exchangers 43B and 43C from A, and is condensed and liquefied by these use side heat exchangers 43B and 43C. And these use side heat exchangers 43B, 43
The refrigerant condensed and liquefied in C is reduced in pressure by the refrigerant flow control valve 47 of the use side unit 30A through the liquid pipe 38, and is then evaporated and vaporized in the use side heat exchanger 43A.

The microcomputer 56 opens the refrigerant flow control valve 50 and opens the refrigerant flow control valve 4.
7, 48 and 49 are adjusted based on the outputs of the temperature sensors 63A, 62B and 62C.

After that, after passing through the use side heat exchanger 43A,
After flowing into the low-pressure gas pipe 37, the suction pipe 33, the gas-liquid separator 55
Are sequentially sucked into the compressor 52. In this way, the cooling and warming storages 17B and 17C are heated by the use-side heat exchangers 43B and 43C acting as condensers, and the cooling only storage 17A is cooled by the use-side heat exchanger 43A acting as an evaporator.

The cooling and heating chambers 17B and 17C are controlled by the microcomputer 56 based on the outputs of the temperature sensors 58B and 58C in the same manner as described above.
And the temperature of 17C is below the heating set temperature,
The energization of the auxiliary electric heater 46B or 46C is controlled by the microcomputer 56,
B and 17C are supplementarily heated.

Thus, as described above, only the use side heat exchanger 43B or 43C requires the cooling and heating chambers 17B and 17C.
When the internal heating is insufficient, the heating by the use side heat exchangers 43B and 43C and the temperature sensor 58B or 58C
When the detected temperature is equal to or lower than the set heating temperature based on the output of the above, the auxiliary electric heaters 46B and 46C are energized, and when the detected temperature is equal to or higher than the set heating temperature, the energization is cut off. The shortage of heat can be supplemented by the auxiliary electric heater 46B or 46C while utilizing heat, so that quick heating can be performed and efficient operation can be performed. The auxiliary electric heater 4
Since 6B or 46C is supplied with electric power in an auxiliary manner, power consumption can be reduced and running cost can be significantly reduced as compared with a case where heating is performed only by an electric heater. become.

The control device C for a vending machine according to another embodiment of the present invention has a microcomputer 56 in addition to the above embodiment as shown by a dotted line in FIG. A temperature sensor 60 for detecting the outside air temperature and a temperature sensor 61 for detecting the temperature of the refrigerant discharge gas of the compressor 52
Is connected. You may connect the pressure sensor 65 which detects the high pressure side pressure of a refrigerant circuit.

Here, the temperature sensor 61 is connected to the refrigerant discharge pipe 3.
2 and detects the refrigerant temperature in the refrigerant discharge pipe 32. The pressure sensor 65 is provided on the high-pressure gas pipe 36 and detects the pressure in the high-pressure gas pipe 36.

Here, FIG. 8 is a graph in which the horizontal axis represents the outside air temperature, and the vertical axis represents the refrigerant condensation temperature, the discharge gas temperature, and the refrigerant high pressure.
This shows how each temperature and pressure change with the change of the outside air temperature. That is, when the outside air temperature decreases, the respective temperatures and pressures also decrease, and it becomes impossible to obtain the heating capacity necessary for heating the product in the use-side heat exchangers 43B and 43C.

The microcomputer 56 monitors the heating capacity of the use side heat exchangers 43B and 43C based on at least one of the outside air temperature, the discharge gas temperature, the refrigerant condensation temperature and the refrigerant high pressure detected by each sensor. If the respective temperatures and pressures are less than the predetermined set values (determined from the required temperature of the product), it is determined that heating is insufficient with only the use-side heat exchangers 43B and 43C, and the auxiliary electric heater is determined. Auxiliary power is supplied to 46B and 46C.

As a result, the use side heat exchanger 43 is given priority.
B and 43C heat the cooling and warming chambers 17B and 17C, and additionally use the auxiliary electric heaters 46B and 46C to supplement the heating capacity of the use side heat exchangers 43B and 43C affected by the outside air temperature. By energizing, power consumption can be significantly reduced and the running cost can be significantly reduced as compared with the case where heating is usually performed only by an electric heater.

[0052]

According to the present invention, a product storage is formed in a main body composed of a heat insulating box, the product storage is divided into a plurality of storages, and the products put in each storage are cooled. Or in a vending machine that is heated and sold from a sales outlet,
A heat source side unit having a compressor and a heat source side heat exchanger,
It consists of a plurality of use-side units each having a use-side heat exchanger disposed in each storage, and the heat-source-side heat exchanger is branched and connected to a refrigerant discharge pipe and a refrigerant suction pipe of a compressor via a switching valve. On the other hand, the unit-to-unit piping connecting these two units is made up of a high-pressure gas pipe branched and connected to the refrigerant discharge pipe, a low-pressure gas pipe branched and connected to the refrigerant suction pipe, and a liquid pipe connected to the heat source side heat exchanger. And a cooling and heating device in which each use side heat exchanger is branched and connected to a high pressure gas pipe and a low pressure gas pipe via a switching valve, and connected to a liquid pipe via a refrigerant flow control valve. Provided, a simple circuit configuration using a single-function heat source-side heat exchanger, simultaneous cooling operation or heating operation in each cabinet by multiple use-side heat exchangers, as well as in each cabinet And simultaneous operation of cooling and heating can be freely selected by any user side unit. Door can be.

In the simultaneous operation of cooling and heating in each storage, the use side heat exchanger acting as a condenser and the heat source side heat exchanger acting as an evaporator are connected in series. Efficient operation by recovery can be performed, and the running cost can be significantly reduced.

In particular, since the auxiliary electric heater is provided in the storage, the reduction of the outside air temperature reduces the effect of the use side heat exchanger used as the heating device as a condenser on the auxiliary electric heater. Can be effectively supplemented. Thus, it is possible to reduce the power consumption while realizing the heating of the product without any trouble.

According to the second aspect of the present invention, in addition to the above, the use side unit is provided with a blower, and the auxiliary electric heater is provided on the downwind side of the blower, so that the cooled or heated air is stored by the blower. The inside of the refrigerator can be efficiently cooled or heated. In particular, since the auxiliary electric heater is installed on the lee side of the blower, the heated air can be forced to circulate in the refrigerator, reducing the inconvenience of heat leaking into the adjacent refrigerator. Will be able to do that.

According to the third aspect of the present invention, in addition to the above, the auxiliary electric heater is energized when the inside of the storage by the use side heat exchanger is insufficient, so that the waste heat of the heat source side heat exchanger is Is used preferentially to heat the inside of the refrigerator, and the insufficient amount of heat can be supplemented by the auxiliary electric heater, thereby enabling efficient operation.

According to the fourth aspect of the present invention, in addition to the above, the auxiliary electric heater is controlled by the control device, and the input side of the control device has outside air temperature, discharge gas temperature, refrigerant high pressure, refrigerant condensing temperature. At least one of the detecting means is connected, the outside air temperature, the discharge gas temperature, the refrigerant high pressure,
When at least one of the refrigerant condensing temperatures becomes equal to or less than the set value, the auxiliary electric heater is energized, so that the state of the high-temperature and high-pressure refrigerant flowing into the use-side heat exchanger is determined by the outside air temperature and discharge. It accurately grasps at least one of the gas temperature, the refrigerant high-pressure pressure, and the refrigerant condensing temperature, determines the capacity of the use side heat exchanger, and supplements the necessary amount of heat with the auxiliary electric heater. It is.

[Brief description of the drawings]

FIG. 1 is a front view of a vending machine according to an embodiment of the present invention.

FIG. 2 is a front view of the vending machine of FIG. 1 excluding a front door and a heat insulating door.

FIG. 3 is a vertical sectional side view of the vending machine of FIG. 1;

FIG. 4 is a refrigerant circuit diagram of the vending machine of FIG.

FIG. 5 is a configuration diagram of a control device of the vending machine of FIG. 1;

FIG. 6 is a refrigerant circuit diagram of the vending machine of FIG. 1;

FIG. 7 is a refrigerant circuit diagram of the vending machine of FIG. 1;

FIG. 8 is a diagram illustrating a change in refrigerant condensing temperature or the like with respect to a change in outside air temperature and a control method of an auxiliary electric heater based on the change.

[Explanation of symbols]

1 Vending machine 17 Commodity storage 17A Specified storage 17B, 17C Cooling and heating storage 30A, 30B, 30C User side unit 31 Heat source side unit 32 Refrigerant discharge pipe 33 Refrigerant suction pipe 34A, 34B, 39A, 39B, 40A, 40B Switching Valve 36 High-pressure gas pipe 37 Low-pressure gas pipe 38 Liquid pipe 43A, 43B, 43C Use side heat exchanger 44A, 44B, 44C Blower 46A, 46B Auxiliary electric heater 47, 48, 49, 50 Refrigerant flow control valve 52 Compressor 53 Heat source Side heat exchanger 55 Gas-liquid separator 56 Microcomputer C Controller

Claims (4)

[Claims] 1. A product storage box is formed in a main body composed of an insulated box, and the product storage box is divided into a plurality of storage boxes, and the goods put in each storage box are cooled or heated to sell them. In a vending machine to be sold from the mouth, a heat source side unit having a compressor and a heat source side heat exchanger,
A plurality of use-side units having use-side heat exchangers. The heat-source-side heat exchanger is branched and connected to a refrigerant discharge pipe and a refrigerant suction pipe of a compressor via a switching valve, and these two units are connected. The inter-unit piping is constituted by a high-pressure gas pipe branched and connected to the refrigerant discharge pipe, a low-pressure gas pipe branched and connected to the refrigerant suction pipe, and a liquid pipe connected to the heat source side heat exchanger. Connecting each of the use-side heat exchangers disposed in the refrigerator to the high-pressure gas pipe and the low-pressure gas pipe via a switching valve, and connecting to the liquid pipe via a refrigerant pressure reducer. A vending machine, comprising: a cooling and heating device; and an auxiliary electric heater provided in the storage. 2. The vending machine according to claim 1, wherein the use side unit includes a blower, and an auxiliary electric heater is provided on the lee side of the blower. 3. The vending machine according to claim 1, wherein the auxiliary electric heater is energized when the inside of the compartment is insufficiently heated by the use side heat exchanger. 4. The auxiliary electric heater is controlled by a control device, and at least one of an outside air temperature, a discharge gas temperature, a refrigerant high pressure, and a refrigerant condensation temperature is connected to an input side of the control device. The auxiliary electric heater is energized when any one of the outside air temperature, the discharge gas temperature, the refrigerant high-pressure pressure, and the refrigerant condensing temperature is equal to or lower than a set value. The vending machine according to claim 2 or 3.