JP2008040656A - Automatic vending machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automatic vending machine for heating or cooling merchandise such as canned beverage for selling for operating a heating system at a compressor intake coolant gas temperature highly stable, and for sharply reducing power consumption, and for preventing the deterioration of sales merchandise due to heating without deteriorating the heating capability or efficiency. <P>SOLUTION: This automatic vending machine is provided with a heating system 19 having at least a compressor 14; a condenser 15 for heating; a heat exchanger 17 outside a container acting as a pre-cooler; a post-cooler 18; and a capillary tube 16 for heating. Air at the lower part of the container is heated by the condenser 15 for heating installed at the lower part of the container, and air at the upper part of the container is thermally exchanged with the post-cooler 18 installed at the upper part of the container. Thus, it is possible to prevent the deterioration of sales merchandise due to heating, and to sharply reduce power consumption without deteriorating the heating capability and efficiency. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a heating system, in particular, in a vending machine that sells products such as canned beverages heated or cooled.

  In recent years, while environmental protection has been screamed, the vending machine industry has been promoting energy saving with the introduction of the 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).

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

  FIG. 5 is a schematic configuration diagram viewed from the side of a conventional vending machine described in Patent Document 1.

  As shown in FIG. 5, the conventional vending machine includes a compressor 1, a condenser 2, a first expansion valve 3, a second expansion valve 4, a first evaporator 5, and a second System 6, a compressor 1, a condenser 2, a first expansion valve 3, a second expansion valve 4, a first evaporator 5, and a second evaporator 6 connected in a ring shape It has a heating system consisting of piping.

  Here, the first evaporator 5 and the second evaporator 6 are connected in parallel, and the refrigerant is supplied by opening and closing the first expansion valve 3 and the second expansion valve 4.

  The first evaporator 5 is installed outside the compartment of the product storage 7, the second evaporator 6 is installed at the top of the product storage 7, and the condenser 2 is installed at the bottom of the product storage 7. is set up.

  Further, a suction port of each of a duct 8 connected to the condenser 2 and a duct 9 connected to the second evaporator 6 is provided in the center of the product storage 7 in the height direction.

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

  First, immediately after the product is put into the product storage 7, the second expansion valve 4 is fully closed, and the refrigerant discharged from the compressor 1 is heated by the condenser 2 with the air and heat in the product storage 7. After exchange and condensate, the pressure is reduced by the first expansion valve 3 and supplied to the first evaporator 5. The first evaporator 5 exchanges heat with the outside air to evaporate and returns to the compressor 1.

  Next, when the product in the product storage 7 exceeds a predetermined temperature, the first expansion valve 3 is fully closed, and the refrigerant discharged from the compressor 1 passes through the condenser 2 and passes through the second expansion valve. The pressure is reduced at 4 and supplied to the second evaporator 6. Then, the second evaporator 6 evaporates by exchanging heat with the air in the product storage 7 and then returns to the compressor 1.

At this time, as indicated by the solid line arrow in FIG. 5, the air in the lower part of the product storage 7 is circulated and supplied to the condenser 2 from the suction port of the duct 8 provided at the approximate center of the product storage 7. . Further, as indicated by the dotted arrows in FIG. 5, the air in the upper part of the product storage 7 is circulated and supplied to the second evaporator 6 from the suction port of the duct 9 provided in the approximate center of the product storage 7. Is done.
JP 2004-33198 A

  FIG. 6 is a Mollier diagram of the refrigerant of a conventional vending machine, in which the horizontal axis indicates the enthalpy h of the refrigerant and the vertical axis indicates the pressure P of the refrigerant. When the first evaporator 5 is used for heating, the refrigerant changes its state as indicated by abcda. And the heating capability at this time is bc.

  On the other hand, when heating is performed using the second evaporator 6, part of the air heated by the condenser 2 also flows into the upper part of the product storage 7 by natural convection, and the second evaporator 6. Therefore, the heating capacity ec and the cooling capacity df are offset, and the actual heating capacity is be.

  That is, in the above conventional configuration, the product can be heated more efficiently than using the heater, and the product is deteriorated by warming the product for a long time by cooling the upper part in the product storage 7. However, there is a problem that the heating ability is lowered and the efficiency is deteriorated.

  Further, in the above-described conventional configuration, the refrigerant gas temperature sucked into the compressor only rises to the vicinity of the ambient temperature, and particularly at a low outside air temperature where the difference between the evaporation temperature and the outside air temperature becomes small, the degree of superheat cannot be sufficiently obtained, There is a possibility that liquid return to the compressor may occur, resulting in a problem that the system efficiency deteriorates and the possibility that the compressor breaks down increases.

  The present invention solves the above-described conventional problems, and can operate the heating system at a high and stable intake refrigerant gas temperature to the compressor, greatly reducing power consumption, and increasing the heating capacity and efficiency. An object of the present invention is to provide a vending machine capable of preventing deterioration of products sold by heating without lowering.

  In order to solve the above-mentioned conventional problems, the vending machine of the present invention has a heating system provided with a cooler divided into two stages, a pre-stage cooler and a post-stage cooler, and a product storage with a condenser. At the same time as the air inside is warmed, the air inside the product storage is cooled by the latter stage cooler.

  As a result, the refrigerant evaporated by the front cooler can be heat-exchanged with the air in the product storage box by the rear cooler, and the temperature can be further raised, so that the refrigerant gas temperature sucked into the high and stable compressor can be increased. The heating system can be operated and the product can be prevented from being heated for a long time.

  The vending machine of the present invention divides the cooler into two stages, and exchanges heat with the air in the product storage at the latter stage cooler, so that the products sold by heating are not reduced in heating capacity and efficiency. Can be prevented, and the power consumption can be significantly reduced while ensuring the reliability of the compressor.

  The invention according to claim 1 is a vending machine having a hot / cold switching chamber for storing goods, and is divided into at least a compressor, a condenser, an expansion mechanism, a pre-cooler, and a post-cooler. And a heating system comprising a heating system pipe that connects the compressor, the condenser, the expansion mechanism, and the cooler in a ring shape, and the hot / At the same time that the air in the cold switching chamber is heated, the refrigerant that has been heated up to the vicinity of the outside air temperature in the preceding cooler by cooling the air in the hot / cold switching chamber with the latter cooler, The temperature can be further increased, so the heating system can be operated at a high and stable intake refrigerant gas temperature to the compressor, suppressing a decrease in system efficiency and greatly reducing power consumption. It is possible to, can be secured the reliability of the compressor.

  The invention according to claim 2 is the invention according to claim 1, wherein a pre-stage cooler is installed outside the compartment for storing the product, a post-stage cooler is installed in the upper part of the hot / cold switching chamber, and the post-stage cooler is installed. Since the condenser is installed in the hot / cold switching chamber so as to be located below the cooler, the air in the upper part of the hot / cold switching chamber can be cooled by the rear-stage cooler. It is possible to prevent deterioration due to time heating.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, a reflux air passage is provided substantially at the center in the height direction in the hot / cold switching chamber, and a suction port of a duct connected to a condenser is The temperature range in the hot / cold switching room can be effectively divided by being arranged so as to be positioned at the center of the back of the hot / cold switching room in the height direction. Since only the product can be heated, energy saving can be achieved.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein when the heating system cools the hot / cold switching chamber, the refrigerant discharged from the compressor is pre-cooled. The hot / cold switching chamber is heated by providing a flow path switching valve for switching the flow path so that the condensed refrigerant is evaporated in the condenser and then evaporated to the compressor and then returned to the compressor. Since the system can be cooled and the internal volume of the condenser can be reduced, it is possible to prevent a refrigerant shortage due to refrigerant overcondensation and to prevent a reduction in cooling system efficiency.

  The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the capacity of the compressor can be varied, so that the compressor is operated at a high capacity when a product is introduced, The product can reach the predetermined temperature in time, and when stable, the compressor can be operated with low capacity to save energy.

  The invention according to claim 6 is the invention according to any one of claims 1 to 5, wherein R600a is used as the refrigerant, and a normal evaporation temperature when heating the hot / cold switching chamber is -10 to -10. By setting the condensation temperature to 60 to 80 ° C. while keeping the temperature at 10 ° C., it is possible to efficiently keep the warmed product at a predetermined temperature while suppressing an increase in the refrigerant gas discharged from the compressor.

  The invention according to claim 7 is the invention according to any one of claims 1 to 6, wherein, independently of the heating system, at least a cooling evaporator installed in a room for storing the product, A condenser, a compressor, an expansion mechanism, and a cooling system pipe that connects the compressor, the condenser, the expansion mechanism, and the cooling evaporator in a ring shape. By having a dedicated cooling system equipped with a cooling system, the product storage can be efficiently cooled using a cooling system with an optimal cooling capacity independent of the heating system, thus saving energy. Can be achieved.

  The invention according to claim 8 is the invention according to claim 7, wherein the pre-cooler of the heating system and the condenser of the cooling-dedicated system are integrally configured to use waste heat of the condenser. In addition, it is possible to suppress the condensation that occurs in the pre-cooler and to save space.

  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.

  In FIG. 1, the vending machine of the present invention comprises a product storage comprising a first hot / cold switching chamber 11, a second hot / cold switching chamber 12, and a cold dedicated chamber 13. A heating condenser 15 installed in the lower part of the hot / cold switching chamber 11, a heating capillary tube 16 as an expansion mechanism, an external heat exchanger 17 installed outside the product storage, It has a heating system 19 for heating the first hot / cold switching chamber 11, comprising a rear stage cooler 18 installed in the upper part of the hot / cold switching chamber 11, a compressor 20, and an external heat exchanger. 17. Cooling evaporator 21 installed in the lower part of the first hot / cold switching chamber 11, cooling evaporator 22 installed in the lower part of the second hot / cold switching chamber 12, and lower part of the cold dedicated chamber 13 Installed in The cooling evaporator 23, the capillary tubes 24, 25, 26 as expansion mechanisms connected in series to the respective cooling evaporators 21, 22, 23, and the respective capillary tubes 24, 25, 26 are connected in series. And a dedicated cooling system 30 that cools the product storage boxes 11, 12, and 13.

  Here, the external heat exchanger 17 is configured by a two-pass fin tube heat exchanger, and each refrigerant pipe is connected to the heating system 19 and the cooling dedicated system 30. The refrigerant pipe connected to the heating system 19 acts as a pre-cooler, and the refrigerant pipe connected to the cooling dedicated system 30 acts as a condenser.

  The cooling evaporators 21, 22, and 23 are connected in parallel.

  Further, in the first hot / cold switching chamber 11, there are a blower fan 31 for circulating the air in the lower part of the cabinet, a blower fan 32 for circulating the air in the upper part of the cabinet, and the second hot / cold switching chamber 12. Is a blower fan 33 that circulates the air inside the cabinet, a blower fan 34 that circulates the air inside the cabinet in the cold dedicated chamber 13, and an outside heat exchanger that is located near the outside heat exchanger 17. A blower fan 35 leading to 17 is provided.

  The compressor 14 is an inverter compressor, and its capacity can be varied by changing the operation rotational speed.

  Here, the heating system 19 and the cooling dedicated system 30 are filled with hydrocarbon-based R600a (isobutane) which is a kind of natural refrigerant.

  Further, a heating heater 36 is provided in the second hot / cold switching chamber 12, and when the second hot / cold switching chamber 12 is heated, the heating heater 36 is used.

  In the present embodiment, only the first hot / cold switching chamber 11 is heated by the heating system 19, but naturally the second hot / cold switching chamber 12 is also heated by the heating system 19. It is good also as a structure heated by this. In that case, a condenser connected to the heating system 19, a rear stage cooler, and the like are also installed in the second hot / cold switching chamber 12.

  Next, FIG. 2 is a schematic configuration diagram viewed from the side of the vending machine in the present embodiment.

  In FIG. 2, a reflux air passage 37 is provided substantially at the center in the height direction in the first hot / cold switching chamber 11, and at the center in the height direction on the back surface in the first hot / cold switching chamber 11. Is provided with a suction port of a duct 38 connected to the heating condenser 15 and the cooling evaporator 21.

  Here, it is sufficient that the reflux air passage 37 is formed so that the circulating air in the warehouse flows preferentially. For example, the reflux air passage 37 in the present embodiment is provided in the middle of a column in which products are stored. It is formed by providing a gap between adjacent products by a damper (not shown).

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

  First, a case where the first hot / cold switching chamber 11 is cooled will be described.

  When the inside of the first hot / cold switching chamber 11 is cooled, the heating system 19 is not operated, and cooling is performed by the cooling dedicated system 30.

  The refrigerant discharged from the compressor 20 flows into the external heat exchanger 17 and exchanges heat with the outside air guided by the blower fan 35 to be condensed and liquefied. Thereafter, the liquid refrigerant discharged from the external heat exchanger 17 is decompressed by the capillary tube 24 and flows into the cooling evaporator 21. Then, after heat exchange with the air in the hot / cold switching chamber 11 guided by the blower fan 31 is evaporated and evaporated, the refrigerant is returned to the compressor 20.

  Here, the air in the hot / cold switching chamber 11 is guided to the cooling evaporator 21 through the duct 38 through the reflux air passage 37 as shown by the solid line arrow in FIG. And cooled. Then, the cooled air circulates in the lower part of the warehouse, and cools the products in the lower part of the warehouse.

  The same operation is performed when each of the second hot / cold switching chamber 12 and the cold exclusive chamber 13 is cooled. In addition, a refrigerant | coolant is selectively flowed through each cooling evaporator 21,22,23 by opening and closing of the solenoid valves 27,28,29 according to the temperature in a goods storage.

  Here, the capillary tubes 24, 25, and 26 are each designed to have an evaporation temperature of about −20 to −15 ° C.

  Next, when the inside of the first hot / cold switching chamber 11 is heated, the electromagnetic valve 27 of the dedicated cooling system 30 is closed so that no refrigerant flows into the cooling evaporator 21, and the heating system 19 is turned on. Operate.

  The refrigerant discharged from the compressor 14 flows into the heating condenser 15 and exchanges heat with the air in the hot / cold switching chamber 11 guided by the blower fan 31 to be condensed and liquefied. Then, the pressure is reduced by the heating capillary tube 16 and then flows into the external heat exchanger 17. Then, it exchanges heat with the outside air guided by the blower fan 35 to evaporate, and the temperature is raised to near the outside temperature. Thereafter, it flows into the rear cooler 18, exchanges heat with the air in the hot / cold switching chamber 11 guided by the blower fan 32, further increases the temperature, and returns to the compressor 14.

  Here, the heating capillary tube 16 is designed to have a normal evaporation temperature of −10 to 10 ° C. and a condensation temperature of 60 to 80 ° C.

  Next, the air in the hot / cold switching chamber 11 is supplied to the heating condenser 15 through the duct 38 through the reflux air passage 37 as shown by the solid line arrow in FIG. Guided and heated. And the heated air circulates in the lower part in the warehouse, and the product in the lower part in the warehouse is heated.

  On the other hand, as shown by the dotted arrows in FIG. 2, the air in the upper part of the cabinet is led to the rear cooler 18 through the reflux air passage 37 and cooled. Then, the cooled air circulates in the upper part of the warehouse, and the product in the upper part of the warehouse is cooled, and the product can be prevented from being deteriorated by being heated for a long time.

  FIG. 3 is a Mollier diagram of the refrigerant of the vending machine according to the present embodiment, where the horizontal axis indicates the enthalpy h of the refrigerant and the vertical axis indicates the pressure P of the refrigerant.

  If the refrigerant evaporates and evaporates in the external heat exchanger 17 without using the post-stage cooler 18 and then directly returns to the compressor 14, the refrigerant changes its state as indicated by abcda. And the heating capability at this time is bc.

  On the other hand, by using the post-stage cooler 18 as in the present embodiment, the refrigerant changes its state as indicated by gibcdag. That is, the temperature of the refrigerant evaporated by the external heat exchanger 17 is further raised by the rear cooler 18. As a result, the heating system 19 can be operated at a high and stable intake refrigerant gas temperature to the compressor 14 even at a low outside air temperature where the difference between the outside air temperature and the evaporation temperature is small.

  However, if the intake refrigerant gas temperature is increased, the refrigerant gas temperature discharged from the compressor 14 increases as can be seen from FIG. 3, but in this embodiment, the efficient R600a is used as the refrigerant. The rise in the discharged refrigerant gas temperature can be suppressed relatively small.

  In addition, as with conventional vending machines, a part of the air heated by the heating condenser 15 flows into the upper part of the chamber by natural convection and is cooled by the rear-stage cooler 18. Although the cooling capacity is offset, the actual heating capacity is not lowered because the cooling capacity is offset by the heating capacity increased by increasing the intake refrigerant gas temperature. That is, in FIG. 3, the heating capability ib and the cooling capability ag are offset, and the actual heating capability becomes bc as in the case where the rear stage cooler 18 is not used.

  The external heat exchanger 17 as a front stage cooler is used to evaporate the refrigerant, and the rear stage cooler 18 is mainly used to increase the degree of superheat, but the capacity of the external heat exchanger 17 is insufficient. In such a case, the refrigerant may be evaporated by the rear stage cooler 18. However, in this case, since the point a in FIG. 3 moves to the left, the heating capacity is reduced and the efficiency is deteriorated. Therefore, the external heat exchanger 17 should be designed so that it can be sufficiently evaporated. Is desirable.

  As described above, in the present embodiment, the cooler is divided into two stages, and heat is exchanged with the air in the upper part of the first hot / cold switching chamber 11 in the rear stage cooler 18, so that it is high and stable. Since the heating system 19 can be operated at the intake gas temperature to the compressor 14, it is possible to suppress a reduction in system efficiency, greatly reduce power consumption, and warm the product for a long time. It is possible to prevent the deterioration. Furthermore, the reliability of the compressor can be ensured.

  Further, by dividing the temperature region in the first hot / cold switching chamber 11 vertically by the reflux air passage 37, it is possible to effectively cool or heat only the product in the lower part of the cabinet, thereby saving energy. Can be planned.

  Furthermore, since the compressor 14 is an inverter compressor, the compressor 14 can be operated at a high capacity when the product is put in, the product can reach a predetermined temperature in a short time, and the compressor 14 can be operated at a low capacity when stable. Can be operated to save energy.

  In the present embodiment, the first hot / cold switching chamber 11 is not heated by using the waste heat generated when the cold dedicated chamber 13 or the second hot / cold switching chamber 12 is cooled. Since the dedicated cooling system 30 independent of the temperature system 19 is provided, the heating system 19 and the dedicated cooling system 30 can be operated independently, so that cooling and heating can be performed efficiently.

  Furthermore, by providing the external heat exchanger 17 in which the pre-cooler of the heating system 19 and the condenser of the cooling dedicated system 30 are integrated, the waste heat of the condenser of the cooling dedicated system 30 is used, Condensation generated in the pre-cooler of the heating system 19 can be suppressed and space saving can be achieved.

(Embodiment 2)
FIG. 4 is a refrigerant circuit diagram of the vending machine according to the second embodiment of the present invention.

  In FIG. 4, the vending machine of the present invention comprises a product storage comprising a first hot / cold switching chamber 11, a second hot / cold switching chamber 12, and a cold dedicated chamber 13. The inside / outside heat exchanger 41 installed in the lower part of the hot / cold switching chamber 11, the heating capillary tube 42 as the expansion mechanism, the cooling capillary tube 43, and the outside heat exchange installed outside the product storage The first hot / cold switching chamber 11 and the four-way switching valve 44 for switching the refrigerant flow path during cooling and warming. 11 has a heating system 45 dedicated to heating and cooling 11, a compressor 20, a cooling evaporator 22 installed in the lower part of the second hot / cold switching chamber 12, and a lower portion of the cold dedicated chamber 13. The three-way switching valve 46 for switching the cooling evaporator 23, the capillary tubes 25, 26 as expansion mechanisms connected in series to the cooling evaporators 22, 23, and the cooling evaporator for flowing refrigerant. Thus, the second hot / cold switching chamber 12 and the cold dedicated chamber 13 are cooled exclusively.

  Here, the external heat exchanger 17 is constituted by a two-pass fin tube heat exchanger, and each refrigerant pipe is connected to a heating system 45 and a cooling dedicated system 47. The refrigerant piping connected to the heating system 45 acts as a pre-cooler during heating, acts as a condenser during cooling, and the refrigerant piping connected to the cooling dedicated system 30 acts as a condenser.

  The internal heat exchanger 41 and the external heat exchanger 17 are connected by two parallel pipes, one of which is a heating capillary tube 42 and a heating check valve 48 connected in series, On the other hand, a cooling capillary tube 43 and a cooling check valve 49 are connected in series.

  Here, the heating check valve 48 sets the direction in which the refrigerant flows from the heating capillary tube 42 to the external heat exchanger 17 as the forward direction, and reverses from the heating capillary tube 42 toward the external heat exchanger 17. It is installed so that it does not flow in the direction. The cooling check valve 49 has a forward direction in which the refrigerant flows from the external heat exchanger 17 to the cooling capillary tube 43 and flows in the reverse direction from the cooling capillary tube 43 to the external heat exchanger 17. It is installed so that there is no.

  Further, the external heat exchanger 17 and the rear cooler 18 are connected in parallel to the four-way switching valve 44, and the refrigerant piping connected to the rear cooler 18 is connected to the outside from the electromagnetic valve 50 and the four-way switching valve 44. A heating check valve 51 is provided in the middle of branching to the heat exchanger 17 and the rear cooler 18.

  The cooling evaporators 22 and 23 are connected in parallel.

  Further, in the first hot / cold switching chamber 11, there are a blower fan 31 for circulating the air in the lower part of the cabinet, a blower fan 32 for circulating the air in the upper part of the cabinet, and the second hot / cold switching chamber 12. Is a blower fan 33 that circulates the air inside the cabinet, a blower fan 34 that circulates the air inside the cabinet in the cold dedicated chamber 13, and an outside heat exchanger that is located near the outside heat exchanger 17. 17 is provided.

  The compressor 14 is an inverter compressor, and its capacity can be varied by changing the operation rotational speed.

  Here, the heating system 45 and the cooling dedicated system 47 are filled with hydrocarbon-based R600a (isobutane), which is a kind of natural refrigerant.

  Further, a heating heater 36 is provided in the second hot / cold switching chamber 12, and when the second hot / cold switching chamber 12 is heated, the heating heater 36 is used.

  In the present embodiment, only the first hot / cold switching chamber 11 is heated by the heating system 45. Of course, the second hot / cold switching chamber 12 is also heated by the heating system 45. It is good also as a structure heated by this. In that case, an internal heat exchanger connected to the heating system 45, a rear stage cooler, and the like are also installed in the second hot / cold switching chamber 12.

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

  In addition, since the operation | movement and effect | action at the time of cooling the 2nd hot / cold switching room 12 and the cold exclusive room 13 are the same as that of Embodiment 1, it abbreviate | omits. In the first embodiment, the electromagnetic valve is used to switch the cooling evaporator through which the refrigerant flows. However, in the present embodiment, the three-way switching valve 46 is used because the power consumption can be reduced.

  First, when heating the first hot / cold switching chamber 11, the refrigerant discharged from the compressor 14 is switched in flow path by the four-way switching valve 44, flows into the internal heat exchanger 41, and blower fan Heat is exchanged with the air in the lower part of the cabinet guided by 31 to condense. The liquid refrigerant from the internal heat exchanger 41 is depressurized by the heating capillary tube 42. Here, the heating capillary tube 42 is designed to have a normal evaporation temperature of −10 to 10 ° C. and a condensation temperature of 60 to 80 ° C. Then, the decompressed refrigerant flows into the external heat exchanger 17, exchanges heat with the outside air guided by the blower fan 35, evaporates, and is heated to near the outside air temperature. Thereafter, it passes through the opened electromagnetic valve 50 and flows into the rear cooler 18. In the rear stage cooler 18, heat is exchanged with the air in the upper part of the cabinet guided by the blower fan 32, and the refrigerant is returned to the compressor 14 in a state where the temperature is further increased.

  A heating check valve 51 is provided in a flow path that returns from the external heat exchanger 17 to the compressor 14 via the four-way switching valve 44, and refrigerant is supplied from the external heat exchanger 17 to the compressor 14. Does not flow.

  Next, when cooling the first hot / cold switching chamber 11, the refrigerant discharged from the compressor 14 is switched in the flow path by the four-way switching valve 44, and flows through the heating check valve 51 in the forward direction. And flows into the external heat exchanger 17. The electromagnetic valve 50 is closed so that no refrigerant flows into the rear stage cooler 18. The refrigerant flowing into the external heat exchanger 17 is condensed and liquefied by exchanging heat with the outside air guided by the blower fan 35 and then decompressed by the cooling capillary tube 43. Here, the cooling capillary tube 43 is designed so that the normal evaporation temperature is -20 to -15 ° C. The decompressed refrigerant flows into the internal heat exchanger 41 and exchanges heat with the air in the internal lower part guided by the blower fan 31 to evaporate, and then passes through the four-way switching valve 44 to the compressor 14. Reflux.

  As described above, in the present embodiment, since the first hot / cold switching chamber 11 can be cooled and heated by the heating system 45, the compressor 20 of the cooling dedicated system 47 can be ranked down. In addition, the second hot / cold switching chamber 12 and the cold dedicated chamber 13 can be efficiently cooled independently of the first hot / cold switching chamber 11.

  Further, when the first hot / cold switching chamber 11 is cooled, the refrigerant does not pass through the rear cooler 18, thereby reducing the internal volume of the condenser and reducing the refrigerant shortage due to refrigerant overcondensation. It is possible to prevent the system efficiency during the prevention and cooling from being lowered.

  As described above, the vending machine according to the present invention exchanges heat with the air in the product storage at the time of heating by the latter stage cooler, so that the system can be operated at a high and stable intake refrigerant gas temperature to the compressor. Since it can be operated, it can be applied to any equipment that has an evaporator outside the warehouse.

Refrigerant circuit diagram of vending machine in Embodiment 1 of the present invention Schematic configuration diagram viewed from the side of the vending machine in the same embodiment Mollier diagram of refrigerant of vending machine in the embodiment Refrigerant circuit diagram of vending machine in Embodiment 2 of the present invention Schematic configuration seen from the side of a conventional vending machine Mollier diagram of conventional vending machine refrigerant

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 1st hot / cold switching room 12 2nd hot / cold switching room 13 Cold exclusive room 14 Compressor 15 Heating condenser 16 Heating capillary tube 17 External heat exchanger 18 Subsequent cooler 19 Heating System 20 Compressor 21, 22, 23 Cooling evaporator 24, 25, 26 Capillary tube 30 Cooling dedicated system 37 Reflux air passage 38 Duct 42 Heating capillary tube 43 Cooling capillary tube 44 Four-way switching valve 45 Heating system 47 Cooling system

Claims (8)

  A vending machine having a hot / cold switching chamber for storing products, comprising at least a compressor, a condenser, an expansion mechanism, a cooler divided into two stages of a pre-cooler and a post-cooler, and the compression A heating system having a heating system pipe that connects the condenser, the expansion mechanism, and the cooler in an annular shape, and the condenser heats the air in the hot / cold switching chamber At the same time, a vending machine that cools the air in the hot / cold switching room with the rear cooler.   A pre-cooler is installed outside the compartment to store the product, a post-cooler is installed at the top of the hot / cold switching chamber, and the hot / cold switching chamber is condensed so that it is located below the post-cooler. The vending machine according to claim 1, wherein a vending machine is installed.   A reflux air passage is provided at approximately the center in the height direction in the hot / cold switching chamber, and the suction port of the duct connected to the condenser is disposed at approximately the center in the height direction on the rear surface of the hot / cold switching chamber. The vending machine according to claim 1 or 2.   When cooling the hot / cold switching chamber, the refrigerant discharged from the compressor is allowed to flow through the pre-cooler to condense, and after the condensed refrigerant is evaporated by the condenser, the flow path is switched to return to the compressor. The vending machine according to any one of claims 1 to 3, further comprising a heating system including a flow path switching valve.   The vending machine according to any one of claims 1 to 4, wherein a compressor capable of changing the capacity is used.   The R600a is used as a refrigerant, the normal evaporation temperature when heating the hot / cold switching chamber is set to -10 to 10 ° C, and the condensation temperature is set to 60 to 80 ° C. Vending machine as described in.   Independent of the heating system, at least a cooling evaporator installed in a room for storing the product, a condenser installed outside the compartment for storing the product, a compressor, an expansion mechanism, and the compression The vending machine according to any one of claims 1 to 6, further comprising a cooling-dedicated system including a cooling system pipe that annularly connects the machine, the condenser, the expansion mechanism, and the evaporator.   The vending machine according to claim 7, wherein the pre-cooler of the heating system and the condenser of the cooling-dedicated system are integrally configured.

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