JP2005115824A - Warming system and vending machine using same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a warming system capable of reducing power consumption, and a vending machine using the warming system. <P>SOLUTION: The vending machine comprises a refrigeration system 150 arranging a goods storing chamber in a refrigerative state, and a warming system 200 filled with R600a for arranging the good storing chamber in a warming state comprising an inverter compressor 210 and a receiver tank 230. The refrigeration system 150 and the warming system 200 can be designed at the most suitable shapes of respective heat exchangers. Upon using the R600a coolant, system efficiency can be improved, and power consumption of the automatic vending machine can be reduced. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a heating system using a hydrocarbon refrigerant and a vending machine using the same.

  In recent years, demands for reducing power consumption for vending machines have increased, and a cooling and heating system using waste heat generated by cooling has been proposed as one of the means for reducing power consumption (for example, patent documents). 1).

  Hereinafter, the cooling and heating system of the conventional vending machine will be described with reference to the drawings.

  FIG. 3 is a refrigerant circuit diagram of a cooling and heating system of a conventional vending machine. As shown in FIG. 3, the heat source side unit 22 having the compressor 10 and the heat source side heat exchanger 20 and the use side units 36, 38, and 40 having the use side heat exchangers 30, 32, and 34 are provided. The heat exchanger 20 is branched and connected to the refrigerant discharge pipe 50 and the refrigerant suction pipe 52 of the compressor 10 via switching valves 54 and 56. A high pressure gas pipe 60 branchedly connected to the refrigerant discharge pipe 50, a low pressure gas pipe 62 branchedly connected to the refrigerant suction pipe 52, and a liquid pipe 64 connected to the heat source side heat exchanger 20 are provided. The use side heat exchangers 32 and 34 are branched and connected to the high pressure gas pipe 60 and the low pressure gas pipe 62 through switching valves 70, 72, 74 and 76, respectively, and the use side units 36, 38 and 40 are respectively connected to the vending machine. It is arranged in each warehouse.

  The operation of the vending machine cooling and heating system configured as described above will be described below.

First, when all the interiors are cooled, the switching valves 54, 72, and 76 are opened and the switching valves 56, 70, and 74 are closed, so that the refrigerant discharged from the compressor 10 passes through the refrigerant discharge pipe 50. Then, after flowing through the heat source side heat exchanger 20 acting as a condenser, it is distributed to the respective use side heat exchangers 30, 32, 34 acting as an evaporator via the liquid pipe 64, and flows again in the low pressure gas pipe 62. It merges and is sucked into the compressor 10 through the refrigerant suction pipe 52. Thereby, all the interiors are cooled. Next, when the inside of the cabinet in which the use side units 36 and 38 are arranged is cooled and the inside of the cabinet in which the use side units 40 are arranged is heated, the switching valves 54, 72 and 74 are opened and switched. By closing the valves 56, 70, 76, a part of the refrigerant discharged from the compressor 10 flows through the heat source side heat exchanger 20 acting as a condenser via the refrigerant discharge pipe 50, and the remaining refrigerant is a high-pressure gas. The refrigerant that has condensed in each heat exchanger flows to the utilization side heat exchangers 30 and 32 that act as evaporators via the liquid pipe 64 and flows again through the utilization side heat exchanger 34 that acts as a condenser via the pipe 60. The low-pressure gas pipes 62 join together and are sucked into the compressor 10 through the refrigerant suction pipe 52. Thereby, the interior in which the use side units 36 and 38 are disposed is cooled, and the interior in which the utilization side unit 40 is disposed is heated.
JP 2001-84447 A

  However, the above conventional configuration uses the heat exchanger at the evaporating temperature while frosting at the time of cooling, while using it at the heating steam temperature higher than the condensing temperature at the time of heating, so the optimum design of the heat exchanger However, it is difficult to balance the capacity of the compressor and the capacity of the heat exchanger, and there is a problem that the system efficiency is lowered.

  An object of the present invention is to solve the conventional problems, and to provide a heating system with high system efficiency and reduced power consumption and a vending machine using the heating system.

In order to solve the above conventional problems, the heating system of the present invention and a vending machine using the heating system are as follows: A cooling system arranged to cool the inside of the product storage; and a heating system arranged to heat the inside of the at least one of the product storages, using a hydrocarbon refrigerant as a refrigerant; And a condenser configured to be close to the outlet.

  This makes it possible to design an optimal heat exchanger for the heating system, increase the heat exchange efficiency, and by using a hydrocarbon refrigerant as the refrigerant, high system efficiency can be obtained and the amount of power consumption By providing a condenser configured so that the inlet and the outlet are close to each other, heat is exchanged between the heating steam higher than the condensation temperature on the inlet side and the liquid refrigerant on the outlet side. Therefore, it is possible to condense effectively with a small amount of refrigerant, and it is possible to reduce the amount of flammable hydrocarbon refrigerant enclosed in the system, thereby improving the safety of the system.

  The heating system of the present invention and the vending machine using the heating system can increase the heat exchange efficiency of the heat exchanger, and can achieve high system efficiency and reduce power consumption by using a hydrocarbon refrigerant. it can.

  The invention according to claim 1 is a vending machine that has a plurality of product storages, cools or heats the products put in the product storages, and sells them from a sales outlet. It is possible to design a heat exchanger that is optimal for the heating system, including a cooling system that can be cooled, and a heating system that is arranged to be able to heat at least one of the product storages. It is possible to increase the heat exchange efficiency, and by using a hydrocarbon refrigerant as the refrigerant, a high system efficiency can be obtained, the power consumption can be reduced, and a condenser configured so that the inlet and the outlet are close to each other. By providing the heat exchange between the heating steam higher than the condensation temperature on the inlet side and the liquid refrigerant on the outlet side, it is possible to condense effectively with a small amount of refrigerant, and a flammable hydrocarbon Refrigerant It can be reduced stem enclosed amount and will, it is possible to enhance the security of the system.

  The invention according to claim 2 is the heating system of the invention according to claim 1 and the vending machine using the heating system, and is provided with means for adjusting the refrigerant retention amount, so that it decreases as the internal temperature rises. The amount of refrigerant stagnation can be reduced in accordance with the capacity of the heat exchanger to be performed, the dryness of the condenser outlet can be stabilized, the system efficiency can be improved, and the power consumption can be reduced.

  The invention according to claim 3 is the heating system of the invention according to claim 1 or 2 and the vending machine using the same, wherein the compressor is an inverter compressor provided with operating frequency conversion means. By reducing the operating frequency in accordance with the heat exchanger capacity that decreases as the internal temperature rises and reducing the amount of refrigerant circulation, it is possible to stabilize the dryness of the condenser outlet and improve system efficiency. , Power consumption can be reduced.

  The invention according to claim 4 is the vending machine according to any one of claims 1 to 3, wherein the condenser of the cooling system and the evaporator of the heating system are arranged so that the inside of the refrigerator can be cooled. By arranging them close to each other, it becomes possible to use the waste heat of the cooling system to raise the evaporation temperature of the heating system, improve the system efficiency, and reduce the power consumption.

  The invention according to claim 5 is the heating system according to any one of claims 1 to 4 and the vending machine using the heating system, wherein the hydrocarbon refrigerant is mainly composed of R600a or R600a. By using any one of the mixed refrigerants, it is possible to operate under conditions of high condensation temperature and high evaporation temperature, thereby improving system efficiency and reducing power consumption.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments.

(Embodiment)
FIG. 1 is a schematic configuration diagram of a heating system and a vending machine using the same in an embodiment of the present invention.

  FIG. 2 is a piping pattern diagram of the condenser of the heating system in the same embodiment.

  In FIG. 1, the vending machine 110 has a product storage 120 dedicated to cooling on the upper left side, product storages 122 and 124 capable of switching between cooling and heating on the middle and right sides of the upper part, and a machine room 126 on the lower part. doing. Each product storage 120, 122, 124 is insulated from the outside and the machine room 126 by a heat insulating wall 130. Similarly, each product storage 120, 122, 124 is insulated by the heat insulating walls 132, 134 so as to have a desired temperature space. It becomes. In each of the product storage boxes 120, 122, and 124, sales products 140 such as canned beverages are stored.

  The cooling system 150 includes a compressor 152, a condenser 154, electromagnetic valves 160, 162, and 164 that can open and close a flow path, capillary heat transfer tubes 170, 172, and 174 as decompression means, each product storage box 120, The evaporators 180, 182, and 184 disposed in 122 and 124 are connected to an annular circuit by piping to constitute a cooling cycle. Blower fans 190, 192, 194, and 196 are provided on the condenser 154 and the evaporators 180, 182, and 184 sides.

  Further, the heating system 200 connects an inverter compressor 210, a condenser 220, a receiver tank 230 capable of adjusting a refrigerant retention amount, a capillary heat transfer tube 240 as a decompression means, and an evaporator 250 to the annular circuit by piping, and R600a Is included in the heating cycle.

  A heater 260 is installed in the lower part of the product storage case 122.

  Further, the condenser 154 and the evaporator 250 are arranged close to each other.

  Further, as shown in FIG. 2, the condenser 220 is configured such that the inlet and the outlet are close to each other.

  About the heating system comprised as mentioned above and the vending machine using the same, the operation | movement and an effect | action are demonstrated below.

  First, when cooling the product storage box 120, the solenoid valve 160 is opened and the solenoid valves 162 and 164 are closed, whereby the refrigerant discharged from the compressor 152 flows as shown by the arrows and flows into the condenser 154. The heat is indirectly exchanged with the outside air blown by the fan 190 to liquefy itself, and further passes through the open electromagnetic valve 160 to be decompressed by the capillary heat transfer tube 170 and flows into the evaporator 180.

  Here, the heat is indirectly exchanged with the air in the space in the product storage box 120 blown by the fan 192, and the gas is vaporized and returned to the compressor 152 again.

  In this way, the air in the space in the product storage box 120 is gradually cooled, and the sold product 140 in contact with the cooling air is gradually cooled to reach a desired temperature.

  In addition, since the same operation | movement is performed also at the time of cooling of goods storage 122,124, description is abbreviate | omitted here.

  On the other hand, when the product storage 124 is heated, the refrigerant discharged from the compressor 210 flows as indicated by an arrow, flows into the condenser 220, and the air in the product storage 124 blown by the blower fan 196. The heat is indirectly exchanged, and the liquid itself is liquefied, depressurized by the capillary electric heating tube 240, and flows into the evaporator 250. Here, heat is exchanged with the outside air blown by the blower fan 190, the vaporization is performed, and the cycle of returning to the compressor 210 again is repeated.

  In this way, the air in the space in the product storage 124 is gradually heated, and the sold product 140 that comes into contact with the heated air is gradually heated to reach a desired temperature.

  Here, when the air temperature in the product storage 124 increases, the heat exchange capability of the condenser 220 decreases, and the refrigerant cannot be completely liquefied. Therefore, by storing excess refrigerant with the receiver tank 230, the refrigerant retention amount in the heating system 200 can be reduced, and the condenser 220 can be completely liquefied.

  Further, when the commodity storage 122 is heated, the heater 260 heats the air in the space in the commodity storage 122 to obtain the same effect.

  As described above, in the present embodiment, by performing cooling and heating by independent systems, it becomes possible to optimally design each heat exchanger shape and increase the heat exchanger capacity. System efficiency can be improved.

  Moreover, in this Embodiment, R600a used for the refrigerant | coolant of the heating system 200 has the characteristic that the pressure in the same temperature becomes about half compared with R134a widely used with a household refrigerator. Therefore, by configuring the heating system 200 with a combination of the compressor for R134a and R600a, it becomes possible to operate at a high condensation temperature and a high evaporation temperature, and to realize a heating system with low capacity and high efficiency, A high blown air temperature can be obtained, and the sales commodity 140 can be sufficiently heated.

  Further, in the present embodiment, by configuring the inlet and the outlet of the condenser 220 of the heating system 200 to be close to each other, between the heating steam higher than the inlet side condensation temperature and the liquid refrigerant on the outlet side. Since heat is exchanged, it is possible to condense effectively with a small amount of refrigerant, and the amount of flammable refrigerant R600a can be reduced. , Can increase safety.

  In the present embodiment, the condenser 154 of the cooling system 150 and the evaporator 250 of the heating system are disposed close to each other, so that the waste heat of the cooling system 150 is used to evaporate the evaporation temperature of the heating system 200. The system efficiency can be improved, and the evaporator 250 can be effectively defrosted.

  In the present embodiment, the heating system 200 includes the receiver tank 230 capable of adjusting the refrigerant retention amount, so that the temperature in the product storage 124 increases and the heat exchange capability of the condenser 220 decreases. In this case, the refrigerant retention amount can be decreased, the dryness of the outlet of the condenser 220 can be stabilized, and the system efficiency can be improved.

  Furthermore, in the present embodiment, when the compressor 210 is an inverter compressor having operating frequency conversion means, the temperature in the product storage 124 increases and the heat exchange capacity of the condenser 220 decreases. By decreasing the operating frequency and decreasing the refrigerant circulation rate, the dryness at the outlet of the condenser 220 can be stabilized, and the system efficiency can be improved.

  As described above, the heating system according to the present invention and the vending machine using the heating system can select an optimum heat exchanger shape for each of cooling and heating, have high system efficiency, and have a high blown air temperature. Since it is obtained, it can be applied to uses such as a showcase for storing a hot beverage and a cold beverage at the same time.

Schematic configuration diagram of a heating system and a vending machine using the same in an embodiment of the present invention Piping pattern diagram of condenser of heating system in the same embodiment Refrigerant circuit diagram of conventional vending machine cooling and heating system

Explanation of symbols

110 Vending Machine 120, 122, 124 Product Storage 150 Cooling System 154 Condenser 200 Heating System 210 Inverter Compressor 220 Condenser 230 Receiver Tank 250 Evaporator

Claims (5)

In a vending machine that has a plurality of product storages, cools or heats the products put in the product storages, and sells them from a sales outlet, and a cooling system arranged to cool the product storages; A heating system arranged to be able to heat the inside of at least one of the commodity storages, and using a hydrocarbon refrigerant as a refrigerant and a condenser configured to be close to an inlet and an outlet Temperature system and vending machine using it. The heating system according to claim 1, further comprising means for adjusting a refrigerant retention amount, and a vending machine using the heating system. The heating system according to claim 1 or 2, and the vending machine using the same, wherein the compressor is an inverter compressor provided with operating frequency conversion means. The vending machine as described in any one of Claim 1 to 3 which has arrange | positioned the condenser of the cooling system and the evaporator of a heating system which were arrange | positioned so that the inside of a warehouse can be cooled close. The heating system according to any one of claims 1 to 4 and a vending machine using the same, wherein the hydrocarbon refrigerant is either R600a or a mixed refrigerant containing R600a as a main component.

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