JP2006146751A - Vending machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat pump heating system not generating dew condensation water in an out-box heat exchanger, or efficiently processing generated the dew condensation water, and to provide a vending machine allowing reduction of power consumption in heating. <P>SOLUTION: A heating evaporator 16 and the out-box heat exchanger 2 (a cooling condenser) are installed in parallel such that the heating evaporator 16 is positioned on a downwind side, and a common drain pan 17 is equipped below the heating evaporator 16 and the out-box heat exchanger 2. Thereby, exhaust heat of the cooling condenser is collected by the heating evaporator to raise an evaporation temperature and to improve heating efficiency, the dew condensation water generated in the heating evaporator 16 is collected in the drain pan 17, and evaporation can be promoted by the exhaust heat of the out-box heat exchanger 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an automatic vending machine that warms or sells products such as canned beverages at the same time as the heating, and uses the latent heat generated when the refrigerant compressed by the compressor condenses to perform automatic heating. It relates to vending machines.

  In recent years, demands for reducing power consumption for vending machines have increased, and as a means for reducing power consumption, one utilizing waste heat generated by cooling has been proposed (for example, see Patent Document 1).

  Hereinafter, a conventional vending machine will be described with reference to the drawings.

  FIG. 4 is a block diagram of a conventional vending machine.

  As shown in FIG. 4, the conventional vending machine includes a compressor 1, an external heat exchanger 2, an external fan 3, an internal heat exchanger 4, an internal fan 5, a heater 6, a product rack 7, and a carry-out. A chute 8 and a product outlet 9 are provided, and a drain pan 11 is provided at the bottom of the external heat exchanger 2. Furthermore, the compressor immersion pan 12 is provided in the lower part of the compressor, and is connected to the drain pan 11 via the connecting portion 13.

With the above configuration, the outdoor heat exchanger 2 is allowed to act as an evaporator during the time when the product is not expected to be sold, such as at midnight, to cause condensation on the external heat exchanger 2 and further to freeze from the air. A large amount of moisture is taken in, and then the external heat exchanger 2 is operated as a condenser, and the moisture condensed and frozen in the external heat exchanger 2 is collected in the drain pan 11 as drain water. The water is introduced into the compressor immersion pan 12 through the connecting portion 13, and the compressor 1 is cooled with the water. As a result, the capacity of the compressor 1 can be improved.
JP 2002-277147 A

  In the heat pump type heating / cooling device, each heat exchanger is provided with a solenoid valve, and by switching those solenoid valves, the inside heat exchanger is used as an evaporator to cool the inside of the warehouse where it is installed. Use the waste heat as a condenser to heat the storage room. As a result, the exhaust heat of the refrigeration cycle that has been thrown away to the outside can be effectively utilized, and the power consumption of the vending machine can be greatly reduced.

  In the above conventional configuration, as one application example of the heat pump type heating / cooling device, the compressor 1 is cooled by the generated drain water by operating the external heat exchanger 2 as an evaporator, and the compressor However, since the vending machine does not have a drainage function, the heat pump type heating system does not generate condensed water in the external heat exchanger or how efficiently the generated condensed water is used. The important issue is how to deal with it.

  The present invention solves the conventional problems, and proposes a heat pump heating system that does not cause condensed water in the external heat exchanger or efficiently processes the generated condensed water, and consumes power during heating. The purpose is to provide a vending machine capable of reducing the amount of money.

  In order to solve the above conventional problems, the vending machine of the present invention uses a heat pump heating cycle in which a heating evaporator is disposed on the lee side of the cooling condenser and a common drain pan is installed. It is.

  As a result, the exhaust heat of the cooling condenser is recovered by the heating evaporator, so that the evaporation temperature is increased and the heating efficiency is increased.At the same time, the condensed water generated by the heating evaporator is received by the drain pan, and the cooling condenser. Evaporation is accelerated by exhaust heat.

  The vending machine of the present invention uses a heat pump heating cycle that maximizes the air volume of the outside fan when the outside air temperature or the condensation temperature of the cooling condenser exceeds a predetermined value.

  This reduces the condensing temperature of the cooling condenser and increases the cooling efficiency, and at high outside air temperature conditions (for example, 20 ° C or higher) where the absolute humidity is high and condensation water is likely to be generated in the heating evaporator, condensation occurs at the maximum air volume. It will promote water evaporation.

  The vending machine according to the present invention uses a heat pump heating cycle provided with a heating evaporator built in a cooling compressor.

  As a result, the exhaust heat of the cooling compressor is recovered by the heating evaporator, whereby the evaporation temperature is increased and the heating efficiency is increased, and condensation in the heating evaporator is prevented.

  In addition, the vending machine of the present invention, in a heat pump heating cycle provided with a heating evaporator built in a cooling compressor, when the evaporation temperature of the heating evaporator does not exceed a predetermined value for a certain period of time. The heating cycle is stopped.

  As a result, the temperature of the cooling compressor is prevented from becoming too low (for example, 5 ° C. or less) when the outside air temperature is low, and the cooling capacity is prevented from being abnormally reduced.

  The vending machine according to the present invention uses a reciprocating compressor as a heating compressor.

  Thereby, since the internal pressure of the compressor is lower than that of the rotary type, the refrigerant staying in the compressor at the time of start-up is quickly discharged, the rise characteristic of the condensation temperature is improved, and highly efficient heating performance is obtained. .

  Moreover, the vending machine of this invention is equipped with the heat insulation wall surrounding the compressor for heating.

  As a result, the surroundings of the lubricating oil are improved when the outside air temperature is low, the rise characteristic of the condensation temperature is improved, and highly efficient heating performance is obtained.

  The vending machine of the present invention does not cause dew condensation in the external heat exchanger (evaporator) of the heat pump heating cycle, or efficiently treats the generated dew condensation and reduces power consumption during heating. can do.

  Since the invention according to claim 1 uses a heat pump heating cycle in which a heating evaporator is disposed on the leeward side of the cooling condenser and a common drain pan is installed, the cooling condenser By collecting the waste heat with the heating evaporator, the evaporation temperature rises and the heating efficiency increases, and the condensation water generated by the heating evaporator is received by the drain pan and the evaporation is promoted by the exhaust heat of the cooling condenser. Can do.

  The invention according to claim 2 uses a heat pump heating cycle that maximizes the air volume of the outside fan when the outside air temperature or the condensation temperature of the cooling condenser exceeds a predetermined value. As the condenser condensing temperature decreases and the cooling efficiency increases, the evaporation of the condensed water generated in the heating evaporator can be promoted with the maximum air volume.

  Since invention of Claim 3 uses the heat pump heating cycle provided with the evaporator for heating built in the compressor for cooling, the exhaust heat of the compressor for cooling is used for the heater for heating. By collecting, the evaporation temperature is increased and the heating efficiency is increased, and condensation in the heating evaporator can be prevented.

  According to a fourth aspect of the present invention, in a heat pump heating cycle provided with a heating evaporator built in a cooling compressor, heating is performed when the evaporation temperature of the heating evaporator does not exceed a predetermined value for a certain period of time. Since the temperature cycle is stopped, it is possible to prevent the cooling capacity from being excessively lowered and the cooling capacity from being abnormally lowered due to the refrigerant temperature becoming too low at the low outside air temperature.

  Since the invention according to claim 5 uses a reciprocating compressor as a warming compressor, the rise characteristic of the condensation temperature is good at a low outside air temperature, and a highly efficient warming performance can be obtained. .

  Since the invention according to claim 6 is provided with the heat insulation wall surrounding the compressor for heating, the rise characteristic of the condensation temperature is good at the low outside air temperature, and highly efficient heating performance can be obtained.

  Embodiments of a vending machine according to the present invention will be described below with reference to the drawings. In addition, about the same structure as the past, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

(Embodiment 1)
FIG. 1 is a structural diagram of a vending machine according to Embodiment 1 of the present invention, and FIG. 2 is a refrigerant circuit diagram of the vending machine according to the embodiment.

  In FIG. 1, a heating cycle for heating canned beverages or the like is formed by connecting a heating compressor 14, a heating condenser 15, and a heating evaporator 16 configured by a high-temperature reciprocating type in an annular shape. The heat pump cycle is a refrigerant, and the outside heat is pumped up by the heating evaporator 16 installed outside the chamber, and the heat is dissipated by the heating condenser 15 installed inside the chamber. Warm the air. In the first embodiment, unlike the conventional embodiment, the heating cycle and the cooling cycle are configured independently. The warming evaporator 16 and the external heat exchanger 2 are installed in parallel so that the warming evaporator 16 is on the leeward side, and shares the external fan 3. With this configuration, it is possible to recover the exhaust heat of each cycle.

  Further, the heating condenser 15 and the internal heat exchanger 4 are also installed in parallel and share the internal fan 5, but cooling and heating are performed simultaneously in one of the three compartments. It is not possible to recover exhaust heat in the cabinet.

  A common drain pan 17 is provided in the lower part of the heating evaporator 16 and the external heat exchanger 2, and the condensed water generated in the heating evaporator 16 is stored. Evaporation of the condensed water collected in the drain pan 17 is promoted by exhaust heat of the external heat exchanger 2 (acting as a condenser for cooling).

  A heat insulating wall 18 is wound around the outer periphery of the warming compressor 14 so that the heat retaining property is maintained.

  The vending machine according to the present invention divides the interior of the cabinet into three sections, and is composed of storage rooms comprising a hot / cold switching room 19, a cold dedicated room 20, and a second cold dedicated room 21. A product rack 7 (not shown) is installed.

  As shown in FIG. 2, the heating cycle includes a heating compressor 14, a heating condenser 15 installed in the hot / cold switching chamber 19, a heating evaporator 16 installed outside the cabinet, It consists of a heating expansion valve 22 and is configured to heat the hot / cold switching chamber 19 exclusively.

  In addition, the cooling cycle includes an internal heat exchanger 4 (first evaporator) installed in the hot / cold switching chamber 19, a first expansion valve 23, and a second installed in the cold dedicated chamber 20. The evaporator 24, the second expansion valve 25, the third evaporator 26 and the third expansion valve 27 installed in the second cold dedicated chamber 21, and the external heat exchanger 2 (externally installed) Condenser) and a compressor 1 for cooling. The first expansion valve 23, the second expansion valve 25, and the third expansion valve 27 each have a blocking function while reducing the pressure of the refrigerant passing therethrough.

  Here, the heating condenser 15 is in the form of a finned-tube heat exchanger, like the internal heat exchanger 4 (first evaporator), the second evaporator 24, and the third evaporator 26. However, in consideration of frost formation, priority is given to high condensing capacity, and the tube connection is designed so that the fin interval and the tube interval are relatively narrow and the refrigerant and air flows in opposite directions. As a result, the difference between the condensation temperature and the blown air temperature is suppressed to about 10 ° C. at a heating capacity of 200 to 300 W.

  On the other hand, the heating evaporator 16 is the same as the internal heat exchanger 4 (first evaporator), the second evaporator 24, and the third evaporator 26 in consideration of frost formation at a low outside air temperature. Designed to.

  The heating expansion valve 22 adjusts the evaporation pressure by reducing the pressure of the refrigerant passing therethrough. In particular, immediately after the start-up when the condensing temperature has not risen, the rising characteristic of the condensing temperature can be improved by increasing the amount of circulation by increasing the opening degree of the heating expansion valve 22.

  Here, the heating compressor 14 drops R600a (isobutane), which is a hydrocarbon-based refrigerant, and mineral oil-based refrigeration oil into a low-temperature reciprocating compressor used in a household refrigerator using R134a as a refrigerant. It is intended for high temperatures. This low-temperature reciprocating compressor is driven by a DC inverter, and its capacity can be varied in the range of 100 to 250 W in terms of refrigeration capacity at a condensing temperature of 54.4 ° C. and an evaporation temperature of −23.3 ° C., which are standard conditions. Can do. The reason for changing the capacity by using an inverter is that when canned beverages are packed in a vending machine and heated to about 55 ° C, it operates at a high capacity, and when it reaches 55 ° C, it operates at a low capacity and loses due to frequent ON / OFF. This is to minimize the above.

  In addition, as for the compressor 1 for the cooling cycle, it is also preferable from the viewpoint of environmental protection to use a reciprocating compressor using a hydrocarbon refrigerant such as R600a or R290 (propane).

  The internal fan 5 (first internal fan) circulates the air in the hot / cold switching chamber 19, and also heats the condenser 16 for heating and the internal heat exchanger 4 (first evaporator) and the air. Promotes heat exchange with. The second internal fan 28 and the third internal fan 29 circulate the air in the cold exclusive chamber 20 and the second cold exclusive chamber 21, and the second evaporator 24 and the third evaporator 26. Promotes heat exchange with air.

  The outside fan 3 promotes heat exchange between the heating evaporator 16, the outside heat exchanger 2 (condenser), and outside air, and the exhaust of the outside heat exchanger 2 (condenser). The evaporation of condensed water accumulated in the drain pan 18 is promoted while utilizing heat. The outside fan 3 is configured to be able to vary the air volume by inverter control (not shown), and the outside heat exchanger 2 (condenser) detected by the outside temperature detected by the outside temperature sensor 30 or the condensation temperature sensor 31. When the temperature is equal to or higher than a predetermined value, it is determined that the high outside air temperature (for example, 20 ° C. or higher) at which the condensed water is likely to evaporate, and the outside fan 3 is driven with the maximum air volume to promote evaporation.

  Regarding the vending machine of the first embodiment configured as described above, the operation of hot / cold operation will be briefly described.

  When the hot / cold switching chamber 19 is cooled, after the compressor 1 is driven and the refrigerant discharged from the compressor 1 is condensed in the external heat exchanger 2, the first expansion valve 23 and the second The pressure is reduced by the expansion valve 25 and the third expansion valve 27, and is supplied to the internal heat exchanger 4 (first evaporator), the second evaporator 24, and the third evaporator 26. Then, the refrigerant evaporated in the internal heat exchanger 4 (first evaporator), the second evaporator 24, and the third evaporator 26 is returned to the compressor 1.

  At this time, the storage chamber that has reached a predetermined temperature among the hot / cold switching chamber 19, the cold dedicated chamber 20, and the second cold dedicated chamber 21 includes the first expansion valve 23, the second expansion valve 25, The third expansion valve 27 is closed to stop supplying the refrigerant. Further, when all the storage rooms reach a predetermined temperature, the operation of the compressor 1 is stopped.

  Next, when the hot / cold switching chamber 19 is heated, the first expansion valve 23 is closed and the warming compressor 14 is driven, and the refrigerant discharged from the warming compressor 14 is heated. After being condensed by the warm condenser 15, the pressure is reduced by the warming expansion valve 22 and supplied to the warming evaporator 16. Then, the refrigerant evaporated in the warming evaporator 16 is refluxed to the warming compressor 14.

  As described above, in the present embodiment, the heating evaporator 16 and the external heat exchanger 2 (cooling condenser) are installed in parallel so that the heating evaporator 16 is on the leeward side, By providing a common drain pan 17 below the heating evaporator 16 and the external heat exchanger 2, the exhaust heat of the cooling condenser is recovered by the heating evaporator, evaporating temperature is increased and heating efficiency is increased. The dew condensation water generated in the heating evaporator 16 is stored in a drain pan 17 and the evaporation can be promoted by the exhaust heat of the external heat exchanger 2.

  Further, in the present embodiment, when the outside air temperature or the condensation temperature of the outside heat exchanger 2 (cooling condenser) is equal to or higher than a predetermined value, it is determined that the condensed outside water easily evaporates and the outside fan By driving 3 with the maximum air volume, the condensation temperature of the cooling condenser is lowered and the cooling efficiency is increased, and the evaporation of the condensed water generated in the heating evaporator 16 can be promoted.

  Further, in the present embodiment, since the heating compressor 14 is a reciprocating compressor, the internal pressure of the compressor is lower than that of the rotary type, so that the refrigerant staying in the compressor at the time of startup is quickly discharged. As a result, the rise characteristic of the condensation temperature is improved, and highly efficient heating performance is obtained.

  In the present embodiment, the heat insulating wall 18 is wrapped around the outer periphery of the warming compressor 14, so that the heat retaining property is improved and the surrounding of the lubricating oil is improved even at a low outside temperature, and the rise characteristic of the condensation temperature is improved. Improved and highly efficient heating performance can be obtained.

(Embodiment 2)
FIG. 3 is a refrigerant circuit diagram of the vending machine according to the second embodiment of the present invention. The same configurations as those in the conventional embodiment or the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  The heating evaporator 32 is configured by a fin tube heat exchanger and is built in the cooling compressor 1, and the evaporation temperature is detected by the evaporation temperature detecting means 33.

  With the above configuration, when the evaporation temperature of the heating evaporator 32 built in the compressor 1 does not exceed a predetermined value for a certain time, the heating cycle is stopped.

  As described above, in the present embodiment, the heating evaporator 32 is configured by a fin tube heat exchanger and is built in the cooling compressor 1, so that the exhaust heat of the cooling compressor 1 is used for heating. By collecting with the evaporator 32, the evaporation temperature is increased and the heating efficiency is increased, and condensation in the heating evaporator 32 can be prevented.

  Further, in the present embodiment, the heating cycle is stopped when the evaporation temperature of the heating evaporator 32 does not exceed a predetermined value for a certain period of time. It is possible to prevent the cooling capacity from being excessively lowered (for example, 5 ° C. or less) and the cooling capacity from being abnormally reduced.

  As described above, the vending machine according to the present invention proposes a heat pump heating system that does not generate condensed water in the external heat exchanger or efficiently processes the generated condensed water, and consumes power during heating. Since we can provide vending machines that can reduce the amount, it can be used in applications that require labor savings in small-capacity heating energy, such as showcases that store hot drinks and cold drinks simultaneously, and cup vending machines that supply small amounts of hot water. Is also applicable.

Structure diagram of vending machine in Embodiment 1 of the present invention Refrigerant circuit diagram of vending machine in the embodiment Refrigerant circuit diagram of vending machine in Embodiment 2 of the present invention Structure of conventional vending machine

Explanation of symbols

1 Cooling compressor 2 External heat exchanger (cooling condenser)
3 External fan 14 Heating compressor 15 Heating condenser 16 Heating evaporator 17 Drain pan 18 Heat insulation wall

Claims (6)

  A vending machine using a heat pump heating cycle in which a heating evaporator is installed on the lee side of the cooling condenser and a common drain pan is installed.   A vending machine that uses a heat pump heating cycle that maximizes the air volume of the outside fan when the outside air temperature or the condensation temperature of the cooling condenser exceeds a predetermined value.   Vending machine using a heat pump heating cycle equipped with a heating evaporator built into the cooling compressor.   4. The vending machine according to claim 3, wherein the heating cycle is stopped when the evaporation temperature does not exceed a predetermined value for a certain time.   The vending machine according to any one of claims 1 to 4, wherein a reciprocating compressor is used as the warming compressor.   The vending machine according to any one of claims 1 to 5, further comprising a heat insulating wall surrounding the warming compressor.

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