JP2008071020A - Vending machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the heating efficiency of a cooling/heating system relating to a vending machine for vending commodities such as canned beverage while heating or cooling them and to provide a vending machine having a stable cooling performance even when a cooling system and a cooling/heating system are simultaneously operated for cooling, so that it can reduce power consumption throughout the year. <P>SOLUTION: In addition to the cooling system 10 for cooling a first cold chamber 2 and a second cold chamber 3, the vending machine has a cooling/heating system 10 for cooling or heating a hot/cold switching chamber 1 having an outdoor heat exchanger 6 and a variable-speed compressor 4 which are integrated with the condenser of the cooling system 10. By controlling the variable-speed compressor 4 according to a condensation temperature detected by a condensation temperature sensor 26 provided at the outdoor heat exchanger 6, it is possible to enhance the heating efficiency of the cooling/heating system 10 and to secure a stable cooling performance. In this way, the power consumption of the vending machine can be reduced throughout the year. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a cooling and heating system that uses a latent heat generated when a refrigerant compressed by a compressor condenses in a vending machine that sells products such as canned beverages that are heated or cooled. The present invention relates to a vending machine having a system.

  In recent years, while environmental protection has been screamed, the vending machine industry has been promoting energy saving of equipment, such as the introduction of a top runner system.

  As an energy-saving technology for vending machines, it is particularly effective to reduce power consumption by heating. By using one or more heat pump heating systems that do not use a heater and the heating efficiency is the value of the heater, Technologies for energy saving have been proposed. In addition, the authors have proposed a simple configuration for heating using the heat of the outside air (see, for example, Patent Document 1).

  FIG. 6 is a refrigerant circuit diagram of a conventional vending machine described in Patent Document 1. As shown in FIG. 6, the conventional vending machine includes a storage room including a hot / cold switching chamber 1, a first cold dedicated chamber 2, and a second cold dedicated chamber 3, and includes a compressor for a cooling and heating system. 4. Indoor heat exchanger 5 installed in the hot / cold switching chamber 1, outdoor heat exchanger 6 installed outside the storage room, four-way switching valve 7 for switching the refrigerant flow path during cooling and warming, expansion The mechanism includes a cooling capillary tube 8 and a heating capillary tube 9 as a mechanism, and includes a cooling / heating system 10 dedicated to cooling and heating the hot / cold switching chamber 1, and a compressor 11 for cooling system, A first evaporator 12 installed in one cold dedicated chamber 2, a second evaporator 13 installed in the second cold dedicated chamber 3, a first expansion valve 14, a second expansion valve 15 The outdoor heat exchanger 6 and the first Rudo has a dedicated chamber 2 and the cooling system 16 for cooling the second cold only chamber 3 only.

  Here, the outdoor heat exchanger 6 is composed of a two-pass fin tube heat exchanger, and one refrigerant pipe is connected to the cooling and heating system 10, and serves as an evaporator during heating and as a condenser during cooling. The other refrigerant pipe is connected to the cooling system 16 and acts as a condenser.

  The operation of the vending machine configured as described above will be described below.

  First, when the hot / cold switching chamber 1 is heated, the refrigerant discharged from the cooling / heating system compressor 4 switches the flow path by the four-way switching valve 7 as shown by the dotted arrow in FIG. Is supplied to the indoor heat exchanger 5 to be condensed and liquefied. The liquid refrigerant exiting the indoor heat exchanger 5 is depressurized by the heating capillary tube 9 and then supplied to the outdoor heat exchanger 6 to evaporate, and the gas refrigerant is cooled again via the four-way switching valve 7. Reflux to compressor 4 for temperature system.

  On the other hand, when the hot / cold switching chamber 1 is cooled, the refrigerant discharged from the cooling / heating system compressor 4 is switched by the four-way switching valve 7 as shown by the solid line arrow in FIG. It is supplied to the outdoor heat exchanger 6 to be condensed and liquefied. The liquid refrigerant discharged from the outdoor heat exchanger 6 is decompressed by the cooling capillary tube 8 and then supplied to the indoor heat exchanger 5 to evaporate, and the gas refrigerant passes through the four-way switching valve 7 again for the cooling and heating system. Reflux to the compressor 4.

  In the cooling system 16, the refrigerant discharged from the cooling system compressor 11 is supplied to the outdoor heat exchanger 6 to be condensed and liquefied, and then decompressed by the first expansion valve 14 and the second expansion valve 15. And supplied to the first evaporator 12 and the second evaporator 13, respectively. And it evaporates and vaporizes with the 1st evaporator 12 and the 2nd evaporator 13, and a gas refrigerant recirculates to the compressor 11 for cooling systems again.

Here, when the heating of the cooling and heating system 10 and the cooling system 16 are operated simultaneously, in the outdoor heat exchanger 6, the refrigerant piping that acts as the evaporator of the cooling and heating system 10 and the condenser of the cooling system 16. Since heat exchange is performed with the refrigerant pipes via the fins and air, the system efficiency can be improved.
JP 2006-48638 A

  However, when the hot / cold switching chamber 1 is heated, if the heating load is reduced, the operation rate of the cooling and heating system 10 is reduced, and there is an opportunity for the cooling system 16 and the cooling and heating system 10 to operate simultaneously. There has been a problem that the reduction effect of the power consumption due to the exhaust heat recovery of the cooling system 16 is reduced.

  In addition, when the hot / cold switching chamber 1 is cooled, if the difference between the condensation temperatures of the cooling system 16 and the cooling and heating system 10 increases to ± 5 ° C. or more, the system side with a low condensation temperature becomes insufficient in heat dissipation and the cooling capacity and There existed a subject that cooling efficiency fell.

  The present invention solves the above-described conventional problems, and improves the heating efficiency of the cooling and heating system, and can obtain a stable cooling capacity even when the cooling system and the cooling and heating system are operated simultaneously. It is possible to provide a vending machine capable of reducing power consumption throughout the year.

  In order to solve the above conventional problems, the vending machine of the present invention controls the rotation speed of the variable speed compressor based on the condensation temperature detected by the condensation temperature sensor provided in the outdoor heat exchanger of the cooling and heating system. Is.

  Thereby, even when the hot / cold switching chamber is cooled, stable cooling capacity and cooling efficiency can be ensured.

  The vending machine of the present invention controls the variable speed compressor based on the condensation temperature detected by the condensation temperature sensor provided in the outdoor heat exchanger of the cooling and heating system, so that the cooling system and the cooling and heating system are Even when cooling operation is performed at the same time, stable cooling capacity and cooling efficiency can be ensured, so that the power consumption of the vending machine can be reduced throughout the year.

  The invention according to claim 1 is a vending machine having a hot / cold switching chamber for storing products, and is installed outside an indoor heat exchanger installed in the hot / cold switching chamber and a section for storing products. A cooling and heating system that annularly connects an outdoor heat exchanger, a cooling and heating system expansion mechanism, and a cooling and heating system compressor, and when cooling the hot / cold switching chamber, The system circulates the refrigerant discharged from the compressor from the outdoor heat exchanger to the expansion mechanism and the indoor heat exchanger and returns to the compressor. When the hot / cold switching chamber is heated, The expansion mechanism and the outdoor heat exchanger are circulated from an indoor heat exchanger and connected to return to the compressor. The compressor is a variable speed compressor, and is used as an outdoor heat exchanger of the cooling and heating system. Condensation temperature By providing a sensor and controlling the rotational speed of the variable speed compressor so that the condensation temperature detected by the condensation temperature sensor becomes a predetermined temperature, the power consumption can be reduced even when the hot / cold switching chamber is cooled. Can be reduced.

  The invention according to claim 2 is the invention according to claim 1, wherein the hot / cold switching chamber has a storage chamber that is insulated from the chamber, and includes a cooling system that cools the storage chamber. Independent of the heating system, it is configured by a heat exchanger in which the condenser of the cooling system and the outdoor heat exchanger of the cooling heating system are integrated, and the heat exchanger is connected to the cooling system, Condensation temperature sensors are also provided in the outdoor heat exchanger, and the condensation of each system detected by the condensation temperature sensor is comprised of a two-pass heat exchanger having a refrigerant pipe connected to the cooling and heating system. When the hot / cold switching chamber is cooled by controlling the rotational speed of the variable speed compressor so that the temperature difference is within a predetermined value, The condensation temperature of the rejection heating system can be followed, and the difference in condensation temperature between the cooling system and the cooling heating system can always be kept within ± 5 ° C, preferably within ± 2 ° C. Even when the temperature system performs cooling operation at the same time, stable cooling capacity and cooling efficiency can always be ensured, and power consumption can be further reduced.

  According to a third aspect of the present invention, in the second aspect of the present invention, when the power is turned on, the cooling system is delayed by a predetermined time from the cooling and heating system and started to cool the hot / cold switching chamber. When the power of the vending machine is turned on in the mode, it is possible to approximate the rate of rise of the condensation temperature when cooling the cooling system and the cooling and heating system, and to prevent cooling delay of the cooling and heating system when turning on the power Therefore, it is possible to secure a sufficient cooling rate and reduce power consumption.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same reference numerals are given to the same configurations as those of the conventional example or the embodiments described above, and detailed descriptions thereof will be omitted. The present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a refrigerant circuit diagram of a vending machine according to Embodiment 1 of the present invention.

  FIG. 2 is a perspective view of the outdoor heat exchanger in the same embodiment.

In FIG. 1, the vending machine according to the present invention includes a hot / cold switching chamber 1, a first cold dedicated chamber 2 as a storage chamber formed by being insulated from the hot / cold switching chamber 1, and a second cold dedicated. A storage room comprising a chamber 3, a cooling and heating system compressor 4, an indoor heat exchanger 5 installed in the hot / cold switching chamber 1, an outdoor heat exchanger 6 installed outside the storage room, cooling Consists of a four-way switching valve 7 for switching the refrigerant flow path at the time of heating and heating, a capillary tube 8 for cooling as an expansion mechanism, a capillary tube 9 for heating, and a dryer 17. And having a cooling and heating system 10
Cooling system compressor 11, first evaporator 12 installed in first cold chamber 2, second evaporator 13 installed in second cold chamber 3, outdoor heat exchanger 6 The first one for the cooling system as an expansion mechanism connected in parallel to the outlet of the three-way switching valve 18 and the three-way switching valve 18 for switching between the first evaporator 12 and the second evaporator 13. The cooling system 21 includes a capillary tube 19 and a second capillary tube 20 for cooling system, and performs cooling of the first cold dedicated chamber 2 and the second cold dedicated chamber 3 exclusively.

  Here, as shown in FIG. 2, the outdoor heat exchanger 6 is a so-called cascade heat exchanger in which a condenser of the cooling system and an outdoor heat exchanger of the cooling and heating system are integrally configured, and a two-pass fin. It is composed of a tube heat exchanger, one refrigerant pipe is connected to the cooling and heating system 10, acts as an evaporator during heating, acts as a condenser during cooling, and the other refrigerant pipe is connected to the cooling system 21. Acts as a condenser.

  Moreover, the refrigerant at the time of heating in the cooling and heating system 10 flows in from the inlet pipes 22 arranged in the upper center of the three rows as shown by solid arrows, flows toward the lower stage, and is arranged in the lower stage on the leeward side. It flows out from the outlet pipe 23. Further, the refrigerant flows in the opposite direction during cooling. On the other hand, the refrigerant of the cooling system 21 flows in from the inlet pipe 24 arranged in the middle of the windward side as indicated by the dotted arrow, flows toward the upper stage, and then flows in the row on the leeward side from the upper stage to the middle stage. It flows out from the exit pipe 25 arranged in the leeward side middle stage. That is, the inlet piping 22 when the cooling and heating system 10 is heated is surrounded by the refrigerant piping of the cooling system 21. In addition, a cooling temperature condensing temperature sensor 26 and a cooling system condensing temperature sensor 27 for detecting the condensing temperature are respectively installed in the refrigerant piping of the cooling and heating system 10 and the refrigerant piping of the cooling system 21.

  The indoor heat exchanger 5 is provided with an evaporation temperature sensor 28 that detects the evaporation temperature.

  Then, based on the temperature information detected by each temperature sensor 26, 27, 28, the controller 29 controls the operation of the cooling / heating system compressor 4.

  In addition, the compressor 4 for cooling and heating systems is a variable speed compressor.

  The indoor heat exchanger 5 and the outdoor heat exchanger 6 are connected by two parallel pipes, one of which is a cooling capillary tube 8, a cooling check valve 30, and a dryer 17 connected in series, and the other The heating capillary tube 9 and the heating check valve 31 are connected in series.

  Here, the cooling check valve 30 is installed so that the direction in which the refrigerant flows from the dryer 17 to the cooling capillary tube 8 is the forward direction and does not flow in the reverse direction from the cooling capillary tube 8 toward the dryer 17. The warming check valve 31 has a positive direction in which the refrigerant flows from the heating capillary tube 9 to the outdoor heat exchanger 6 and a reverse direction from the outdoor heat exchanger 6 toward the warming capillary tube 9. Installed so as not to flow.

  Further, in the cooling system 21, the outlet of the first evaporator 12 and the inlet of the second evaporator 13 are connected in series by a serial pipe 32.

  The indoor heat exchanger 4, the first evaporator 12, the second evaporator 13, and the outdoor heat exchanger 6 are provided with independent blower fans 33, 34, 35, and 36, respectively.

  In addition, a heater may be installed in each of the first cold dedicated chamber 2 and the second cold dedicated chamber 3, and if desired, the heater may be heated to form a hot chamber.

  Furthermore, a heater may be installed in the hot / cold switching chamber 1 and used as an auxiliary to heating of the cooling and heating system 10.

  The operation and action of the vending machine configured as described above will be described below.

  First, when the first cold dedicated chamber 2 and the second cold dedicated chamber 3 are cooled, the refrigerant discharged from the compressor 11 is supplied to the outdoor heat exchanger 6 as shown by solid arrows in FIG. The liquid is condensed and liquefied by exchanging heat with the outside air guided to the outdoor heat exchanger 6 by the blower fan 36. Then, the liquid refrigerant discharged from the outdoor heat exchanger 6 is supplied to one of the first capillary tube 19 and the second capillary tube 20 by the opening and closing of the three-way switching valve 18 and decompressed. When the pressure is reduced by the first capillary tube 19, the vapor is supplied to the first evaporator 12 and exchanges heat with the circulating air in the first cold dedicated chamber 2 guided by the blower fan 34. The surplus refrigerant that is supplied to the second evaporator 13 through the serial pipe 32 and cannot be evaporated by the first evaporator 12 is guided by the blower fan 35 in the second evaporator 13. Evaporates by heat exchange with the circulating air in the cold-dedicated chamber 3. Further, when the pressure is reduced by the second capillary tube 20, the pressure is supplied to the second evaporator 13 and evaporated.

  In the present embodiment, the three-way switching valve 18 is used from the viewpoint of reducing power consumption, but an electromagnetic valve may be used.

  Then, the gas refrigerant that has exited the second evaporator 13 returns to the compressor 11 again. Here, the first capillary tube 19 and the second capillary tube 20 are designed so that the evaporation temperature is about −20 to −15 ° C. Further, by using the first capillary tube 19 and the second capillary tube 20 as the expansion mechanism, it can be installed in contact with the refrigerant piping from the second evaporator 13 to the compressor 11 for heat exchange. , Cooling capacity can be improved.

  Next, when the hot / cold switching chamber 1 is heated, the refrigerant discharged from the compressor 4 switches the flow path by the four-way switching valve 7 as shown by the dotted arrow in FIG. Is condensed and liquefied by heat exchange with the circulating air in the hot / cold switching chamber 1 guided by the blower fan 33. The temperature of the liquid refrigerant varies greatly depending on the set temperature of the storage chamber. Generally, when warming canned beverages or the like, the set temperature is 50 to 60 ° C, and the condensation temperature of the indoor heat exchanger 5 is 60 to 80 ° C.

  The liquid refrigerant discharged from the indoor heat exchanger 5 is immediately depressurized by the heating capillary tube 9, supplied to the outdoor heat exchanger 6 through the heating check valve 31, and guided by the blower fan 36. The gas refrigerant evaporates by heat exchange with the outside air, and the gas refrigerant returns to the compressor 4 through the four-way switching valve 7 again. Generally, it is necessary to lower the evaporation temperature of the outdoor heat exchanger 6 when the outside air temperature becomes low. In particular, when the outside air temperature becomes 5 ° C. or less, the evaporation temperature has to be a minus temperature, and the outdoor heat exchanger 6 is attached to the outdoor heat exchanger 6. Frost is generated. Further, when the outside air becomes hot and humid, dew condensation occurs when the refrigerant pipe surface temperature or fin temperature of the outdoor heat exchanger 6 falls below the dew point temperature.

  However, since the outdoor heat exchanger 6 of the present embodiment is configured to surround the inlet pipe 22 when the cooling / heating system 10 is heated with the refrigerant pipe of the cooling system 21, when the cooling system 21 is operated, the cooling system The refrigerant pipe connected to the refrigerant 21 acts as a condenser, and the fin temperature around the refrigerant pipe becomes high. Therefore, when the cooling and heating system 10 and the cooling system 21 are operated at the same time, Since the vicinity of the inlet pipe 22 when the temperature system 10 is heated can be heated, it becomes possible to prevent condensation and frost formation.

  Furthermore, since heat exchange with the air heated by the condenser of the cooling system 21 is possible, the cooling and heating system 10 can be operated at a high evaporation temperature of 0 to 10 ° C. Thereby, the compression ratio can be reduced even under severe heating conditions of a condensation temperature of 60 to 80 ° C., and the efficiency of the compressor 4 for the cooling and heating system can be improved. Moreover, the efficiency of the compressor 11 for cooling systems can be improved by reducing the condensation temperature in the cooling system 21 as well.

  Here, since the compressor 4 of the cooling and heating system 10 is a variable speed compressor, as the heating load of the hot / cold switching chamber 1 is reduced, the rotation speed of the compressor 4 is decreased to be substantially continuous. The operation can be realized, and the heating efficiency of the cooling and heating system 10 can be improved by always recovering the exhaust heat of the cooling system 21, so that the effect of reducing the power consumption can be sufficiently obtained.

  Next, when the hot / cold switching chamber 1 is cooled, the refrigerant discharged from the compressor 4 switches the flow path by the four-way switching valve 7 to the outdoor heat exchanger 6 as shown by the solid line arrow in FIG. Supplied to condense. The liquid refrigerant coming out of the outdoor heat exchanger 6 is supplied to the dryer 17, and the liquid refrigerant stays inside the dryer 17, and the water in the liquid refrigerant is removed. Then, the liquid refrigerant discharged from the dryer 17 is decompressed by the cooling capillary tube 8 through the cooling check valve 30 and supplied to the indoor heat exchanger 5 to be evaporated, and the gas refrigerant passes through the four-way switching valve 7 again. Reflux to the compressor 4.

  Here, the first capillary tube 19 and the second capillary tube 20 are designed so that the evaporation temperature is about −20 to −15 ° C. In addition, it is desirable to install the cooling capillary tube 8 and the outlet pipe for cooling the indoor heat exchanger 5 in contact with each other, and by performing heat exchange, a large amount of supercooling can be obtained and the cooling capacity is improved.

  In the present embodiment, when the hot / cold switching chamber 1 is cooled, the cooling and heating system is set such that the condensation temperature Tchp detected by the condensation temperature sensor 26 of the cooling and heating system 10 becomes the predetermined temperature Tcs. The number of rotations of the 10 compressors 4 is controlled.

  FIG. 3 is a timing chart showing the operation of the variable speed compressor by the condensation temperature control of the cooling and heating system in the same embodiment.

  First, when the cooling and heating system 10 is operating independently, the normal control mode is set such that the rotation speed of the compressor 4 and the temperature in the hot / cold switching chamber 1 detected by an indoor temperature sensor (not shown) Controls start and stop. However, when the room temperature is stable, the compressor 4 of the cooling and heating system 10 is normally operated at a low rotational speed, and the condensation temperature Tchp is lower than the condensation temperature of the cooling system 21. For this reason, the cooling and heating system 10 becomes insufficient in heat dissipation, and there is a possibility that the cooling capacity and the cooling efficiency are lowered.

  Therefore, as shown in FIG. 3, when the cooling system 21 and the cooling / heating system 10 perform the cooling operation at the same time, the operation shifts to the simultaneous operation control mode “a”, and the condensation temperature Tchp of the cooling / heating system 10 is compressed so as to become the predetermined temperature Tcs. The rotation speed of the machine 4 is controlled. Here, the predetermined temperature Tcs is set to substantially the same temperature as the condensation temperature of the cooling system 21. The predetermined temperature Tcs is provided with an upper limit temperature Tcsu and a lower limit temperature Tcsl so that the temperature difference from the condensation temperature of the cooling system 21 does not exceed ± 2 ° C.

  Here, even if the condensation temperature of the cooling system 21 fluctuates greatly, such as when the outside air temperature is high, even if the condensation temperature Tchp is set to the predetermined temperature Tcs, the difference in the condensation temperature does not fall within ± 2 ° C. When the evaporating temperature Te detected in step 1 does not become the lower limit temperature Tesl or more, the operation shifts to the simultaneous operation control mode b, and the predetermined temperature Tcs is increased to a predetermined amount by Tcs ′, thereby increasing the difference in condensation temperature by ± 2. Can be within ° C.

  Therefore, by these controls, even when the cooling and heating system 10 and the cooling system 21 perform cooling operation at the same time, the cooling and heating system 10 is prevented from being insufficient in heat dissipation, and stable cooling capacity and cooling efficiency are ensured. be able to.

  As a method for controlling the condensation temperature of the cooling and heating system 10 when the hot / cold switching chamber 1 is cooled, the condensation temperature sensor 26 and the cooling system 21 of the cooling and heating system 10 installed in the outdoor heat exchanger 6 are used. There is also a method of controlling the rotational speed of the compressor 4 of the cooling and heating system 10 based on the difference ΔTc between the condensation temperature Tchp of the cooling and heating system 10 and the condensation temperature Tcr of the cooling system 21 detected by the respective condensation temperature sensors 27. .

  FIG. 4 is a timing chart showing the operation of the variable speed compressor by the condensation temperature difference control in the same embodiment.

  As shown in FIG. 4, when the cooling and heating system 10 and the cooling system 21 are simultaneously cooled, the rotation speed of the compressor 4 is controlled so that the condensation temperature difference ΔTc is within ± 2 ° C. As a result, even when the condensation temperature Tcr of the cooling system 21 fluctuates due to the outside air temperature, the condensation temperature Tchp of the cooling and heating system 10 can be followed, and the difference ΔTc in the condensation temperature is always within ± 2 ° C. Can do.

  Therefore, by these controls, even when the cooling and heating system 10 and the cooling system 21 perform cooling operation simultaneously, the cooling and heating system 10 is prevented from being insufficient in heat dissipation, and stable cooling capacity and cooling efficiency are always secured. can do.

  In this embodiment, when the power of the vending machine is turned on in the operation mode for cooling the hot / cold switching chamber 1, the cooling system 21 is started with a delay of a predetermined time from the cooling and heating system 10.

  FIG. 5 is a timing chart showing the operation when the vending machine is turned on in the operation mode for cooling the hot / cold switching chamber in the embodiment.

  As shown in FIG. 5, when the power is turned on, the shell temperature of the compressor is lowered, and it takes time for the system temperature to stabilize. In particular, the cooling and heating system 10 that uses a variable speed compressor has a slower rate of increase in the condensation temperature Tchp than the cooling system 21, and therefore, when the cooling and heating system 10 and the cooling system 21 are activated simultaneously, A difference spreads to 2 degreeC or more, and the cooling capacity of the cooling heating system 10 will fall. Therefore, when the power is turned on, the start-up of the cooling system 21 is delayed from that of the cooling and heating system 10, so that the condensing temperature rise rate can be adjusted and the cooling capacity of the cooling and heating system 10 is prevented from being lowered. Therefore, it is possible to shorten the time for cooling the product in the hot / cold switching chamber 1 to a predetermined temperature.

  As described above, the present embodiment has a dedicated cooling and heating system that cools and heats the hot / cold switching chamber separately from the cooling means for the first cold dedicated chamber and the second cold dedicated chamber. As this cooling and heating system, an outdoor heat exchanger composed of a variable speed compressor, an indoor heat exchanger, a cascade heat exchanger integrated with a condenser of the cooling system, a four-way switching valve, and a capillary tube Because it is possible to operate the cooling and heating system independently of the cooling of the cold dedicated room, when the hot / cold switching room is heated, the condensed exhaust heat of the cooling system is used, The evaporating temperature of the cooling and heating system is maintained at a high temperature condition of 0 to 10 ° C., so that the compression ratio can be reduced, the efficiency of the compressor can be improved, and it can be changed according to the reduction of the heating load. By reducing the number of revolutions of the compressor, it is possible to achieve almost continuous operation, and the exhaust heat recovery of the cooling system can always improve the heating efficiency of the cooling and heating system, thus reducing the power consumption. You can get enough.

  In this embodiment, when the hot / cold switching chamber is cooled, the rotational speed of the variable speed compressor is controlled so that the difference in the condensation temperature between the cooling and heating system and the cooling system is kept within 2 ° C. Thus, even when the cooling system and the cooling and heating system are operated at the same time, stable cooling capacity and cooling efficiency can be ensured, so that the power consumption of the vending machine can be reduced throughout the year.

  In the present embodiment, when the power is turned on in the operation mode for cooling the hot / cold switching chamber by starting the cooling system with a predetermined time delay from the cooling and heating system when the power is turned on, the cooling system is turned on. Since the cooling rate of the cooling / heating system can be prevented when the power is turned on by approximating the rising speed of the condensing temperature when cooling the cooling / heating system, it is possible to secure a sufficient cooling rate.

  As described above, the vending machine according to the present invention has the cooling and heating system and the cooling system that share the outdoor heat exchanger, the compressor of the cooling and heating system is a variable speed compressor, and cooling and heating. By controlling the number of revolutions of the compressor so that the condensation temperature during system cooling reaches a predetermined temperature, the heating efficiency of the cooling and heating system can be improved and stable cooling capacity can be ensured. Since it can be reduced, it can be applied to a showcase that switches between hot drinks and cold drinks.

Refrigerant circuit diagram of vending machine in Embodiment 1 of the present invention The perspective view of the outdoor heat exchanger in the embodiment Timing chart showing operation of variable speed compressor by condensing temperature control of cooling and heating system in same embodiment Timing chart showing operation of variable speed compressor by condensing temperature difference control in the same embodiment Timing chart showing the operation when the vending machine is turned on in the operation mode for cooling the hot / cold switching room in the embodiment Refrigerant circuit diagram of a conventional vending machine

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot / cold switching room 2 First cold exclusive room 3 Second cold exclusive room 4 Cooling and heating system compressor 5 Indoor heat exchanger 6 Outdoor heat exchanger 7 Four-way switching valve 8 Cooling capillary tube 9 Heating Capillary tube 10 Cooling and heating system 11 Cooling system compressor 12 First evaporator 13 Second evaporator 19 First capillary tube for cooling system 20 Second capillary tube for cooling system 21 Cooling system 26 Cooling Condensation temperature sensor for temperature system 27 Condensation temperature sensor for cooling system

Claims (3)

  In a vending machine having a hot / cold switching room for storing products, an indoor heat exchanger installed in the hot / cold switching room, an outdoor heat exchanger installed outside a section for storing products, and cooling heating A cooling and heating system in which a system expansion mechanism and a cooling and heating system compressor are connected in a ring shape, and the cooling and heating system is discharged from the compressor when the hot / cold switching chamber is cooled; The refrigerant is circulated from the outdoor heat exchanger to the expansion mechanism and the indoor heat exchanger and returned to the compressor. When the hot / cold switching chamber is heated, the expansion mechanism and the expansion mechanism and the indoor heat exchanger are heated. The outdoor heat exchanger is circulated and connected to return to the compressor, the compressor is a variable speed compressor, a condensation temperature sensor is provided in the outdoor heat exchanger of the cooling and heating system, and the condensation is performed. Vending machine condensation temperature detected by the temperature sensor and controlling the rotational speed of the way variable speed compressor at a predetermined temperature.   The hot / cold switching chamber has a heat-insulated compartment storage chamber, and includes a cooling system for cooling the storage chamber. The cooling system and the cooling heating system are independent of each other, and the cooling system condenser and the cooling heating A heat exchanger integrated with an outdoor heat exchanger of the system, the heat exchanger comprising a refrigerant pipe connected to the cooling system and a refrigerant pipe connected to the cooling and heating system. The outdoor heat exchanger is also provided with a condensation temperature sensor, and the variable speed compressor is rotated so that the difference in the condensation temperature of each system detected by the condensation temperature sensor is within a predetermined value. The vending machine according to claim 1, wherein the number is controlled.   3. The vending machine according to claim 2, wherein when the power is turned on, the cooling system is activated with a predetermined time delay from the cooling and heating system.

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