JP2005115735A - Warming system and automatic vending machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To utilize waste heat at the time of cooling for warming and to reduce the power required for switching or maintenance of cooling/warming to reduce the power consumption in an automatic vending machine which cools or warms a commodity like a canned drink to vend it. <P>SOLUTION: The automatic vending machine has a dedicated warming system which warms a hot/cold switching chamber 1 independently of cooling means of a cold dedicated chamber 2 and a second cold dedicated chamber 3, and the warming system is provided with a compressor 20 for high temperatures having R600a as a coolant, an inside condenser 21, and an outside evaporator 22, and thus the durability of the compressor is secured and high efficiency is easily realized, in a severe warming condition of -10 to 10°C evaporation temperature and 60 to 80°C condensation temperature. <P>COPYRIGHT: (C)2005,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. 6 is a refrigerant circuit diagram of a conventional vending machine.

  As shown in FIG. 6, the conventional vending machine includes a storage room composed of a hot / cold switching room 1, a cold dedicated room 2, and a second cold dedicated room 3, and is installed in the hot / cold switching room 1. Indoor heat exchanger 4, evaporator 5 installed in the cold-dedicated room 2, second evaporator 6 installed in the second cold-dedicated room 2, outdoor heat exchange installed outside the storage room And a cooling and heating system including a compressor 7 and a compressor 8.

  The expansion valve A9, the expansion valve B10, and the expansion valve C11 reduce the pressure of the refrigerant passing therethrough and have a blocking function. The on-off valve A12, the on-off valve B13, the on-off valve C14, and the on-off valve D15 are respectively It controls the presence or absence of refrigerant flow.

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

  When the hot / cold switching chamber 1 is cooled, the on-off valve A12 and the on-off valve D15 are opened, the on-off valve B13 and the on-off valve C14 are closed, and the compressor 8 is driven. The refrigerant discharged from the compressor 8 is condensed by the outdoor heat exchanger 7 and then decompressed by the expansion valve A9, the expansion valve B10, and the expansion valve C11, respectively, and the indoor heat exchanger 4, the evaporator 5, and the second To the evaporator 6. Then, the refrigerant evaporated in the indoor heat exchanger 4, the evaporator 5, and the second evaporator 6 is returned to the compressor 8.

  At this time, the storage chamber that has reached a predetermined temperature among the hot / cold switching chamber 1, the cold dedicated chamber 2, and the second cold dedicated chamber 3 closes the expansion valve A9, the expansion valve B10, and the expansion valve C11. Stop supplying the refrigerant. Further, when all the storage rooms reach a predetermined temperature, the operation of the compressor 8 is stopped.

  Next, when the hot / cold switching chamber 1 is heated, the on-off valve A12, the on-off valve D15, and the expansion valve A9 are closed, the on-off valve B13 and the on-off valve C14 are opened, and the compressor 8 is driven. The refrigerant discharged from the compressor 8 is partially condensed in the indoor heat exchanger 4 and again condensed in the outdoor heat exchanger 7, and then decompressed by the expansion valve B 10 and the expansion valve C 11, respectively. , And supplied to the second evaporator 6. Then, the refrigerant evaporated in the evaporator 5 and the second evaporator 6 is returned to the compressor 8. Further, the storage chamber that has reached a predetermined temperature in the cold dedicated chamber 2 and the second cold dedicated chamber 3 closes the expansion valve B10 and the expansion valve C11 to stop the supply of the refrigerant. Further, when all the storage rooms reach a predetermined temperature, the operation of the compressor 8 is stopped.

Here, the hot / cold switching chamber 1 can be efficiently heated using the condensed waste heat of the refrigerant generated when the cold dedicated chamber 2 and the second cold dedicated chamber 3 are cooled. Compared with the case where the hot / cold switching chamber 1 is heated using another heating means, power consumption can be reduced.
Japanese Patent Laid-Open No. 5-233941

  However, in the above conventional configuration, in order to heat the hot / cold switching chamber and simultaneously cool the cold dedicated chamber and the second cold dedicated chamber, a condensing temperature of 60 ° C. or higher and an evaporation temperature of −10 ° C. or lower are realized at the same time. Therefore, there has been a problem that a medium / low temperature compressor that can withstand such a high compression ratio must be newly developed.

  In general, a compressor for refrigeration and air conditioning is a low temperature compressor for refrigeration having a relatively low evaporation temperature of −30 to −20 ° C., and a high temperature compressor for air conditioning having a relatively high evaporation temperature of −10 to + 10 ° C., And these are roughly classified into medium temperature compressors for an intermediate evaporation temperature of -20 to -10 ° C. In a vending machine having a cold beverage temperature of 5 ° C. and a hot beverage temperature of 55 ° C., an intermediate temperature compressor or a low temperature compressor is used to cool the cold beverage.

  Moreover, since the system using these compressors is designed on the assumption that heat is exchanged with room temperature air, the use range of the compressor is usually limited to a condensation temperature of 60 ° C. or lower. Therefore, in order to heat the high temperature atmosphere around the hot beverage, it is indispensable to develop a compressor that can withstand a condensation temperature of 60 to 80 ° C. exceeding this limit. As a result, in order to realize a cold beverage and a hot beverage in the same system, it is necessary to newly develop a compressor that can be used at an evaporation temperature of −30 to −10 ° C. and a condensation temperature of 60 to 80 ° C. .

  The present invention solves the conventional problems, proposes a heating system that can be easily realized by paying attention to the operating conditions of the compressor, and provides a vending machine that can reduce power consumption during heating. With the goal.

  In order to solve the above-described conventional problems, the vending machine of the present invention has a dedicated heating system for heating the hot / cold switching chamber separately from the cooling means for the cold dedicated room and the second cold dedicated room. In addition, the heating system includes a high-temperature reciprocating compressor using R600a as a refrigerant, an internal condenser, and an external evaporator.

  As a result, by exchanging heat with the atmosphere outside the chamber with a specially designed outside evaporator, the compression ratio can be reduced while maintaining the high temperature condition of the evaporation temperature −10 to 10 ° C., and R600a can be reduced. By using a high-temperature reciprocating compressor as a refrigerant, the main components of a low-temperature reciprocating compressor using R134a produced in large quantities as a refrigerant are diverted to an evaporation temperature of −10 to 10 ° C. Ensuring the durability of the compressor and increasing the efficiency of the compressor can be easily realized under severe heating conditions of 60 to 80 ° C.

  The vending machine of the present invention has a dedicated heating system for heating the hot / cold switching chamber, so that the heating efficiency is about twice as high as that of the heating means having a heating efficiency of about 1 such as an electric heater. Since the efficiency can be easily realized, the power consumption of the vending machine can be greatly reduced.

  The invention according to claim 1 of the present invention uses R600a as a refrigerant, includes an internal condenser, an external evaporator, and a high-temperature reciprocating compressor, and maintains the internal temperature at 50 to 70 ° C. Because it is a vending machine that uses a heating system, it is compressed while maintaining the high temperature condition of evaporation temperature -10 to 10 ° C by exchanging heat with the atmosphere outside the warehouse with a specially designed outside evaporator. The ratio can be reduced, and high efficiency can be realized by using R600a, which is a high boiling point refrigerant suitable for high temperature conditions, as the refrigerant.

  As an example, for various refrigerants used in refrigeration equipment, low pressure, high pressure, compression ratio, discharge gas temperature, and relative values of volume capacity and theoretical efficiency under the conditions of evaporation temperature −15 ° C./condensation temperature 70 ° C. (Table 1) shows the relative values of low pressure, high pressure, compression ratio, discharge gas temperature, volume capacity and theoretical efficiency under the conditions of evaporation temperature 5 ° C./condensation temperature 70 ° C. Here, the values in (Table 1) and (Table 2) are calculated values under supercooling 0 ° C., intake gas temperature 32 ° C., and adiabatic compression conditions. Incidentally, R407C in (Table 1) and (Table 2) selects a low pressure and a high pressure at which the average temperature of the liquid phase line and the gas phase line becomes a predetermined temperature.

  As shown in (Table 1), under the conditions of evaporation temperature −15 ° C./condensation temperature 70 ° C., when R134a or R600a, which is a high boiling point refrigerant, is used, the compression ratio exceeds 12, so that over compression occurs. There is a concern that the discharge gas temperature will rise abnormally under the operating conditions of the above, and the durability of the compressor will decrease, and if the low boiling point refrigerants R407C and R290 are used, the high pressure exceeds 2.5 MPa, There is a concern that the load resistance of the bearing portion is insufficient, abnormal wear occurs, and the durability of the compressor decreases.

  On the other hand, as shown in (Table 2), under the conditions of evaporation temperature 5 ° C./condensation temperature 70 ° C., when R134a or R600a, which is a high boiling point refrigerant, is used, the compression ratio becomes 9 or less, which is in the normal usable range. Furthermore, since R600a has a smaller volume capacity and higher efficiency than R134a, it is suitable for applications that require small capacity and high efficiency, such as a heating system that heats a storage room surrounded by heat insulating material of a vending machine. Are suitable. Under these condensing temperature conditions, the use of R407C or R290, which are low boiling point refrigerants, will cause a problem in the durability of the compressor due to an increase in the high pressure.

  In addition, by using a reciprocating compressor in which the inside of the shell is maintained at the evaporation pressure, the condensation pressure rises to a pressure equivalent to the internal temperature during intermittent operation, reducing the heating loss associated with intermittent compressor operation. Increase efficiency.

  Invention of Claim 2 of this invention used the heating system which makes normal use evaporation temperature into -10-10 degreeC in invention of Claim 1, and makes normal use condensation temperature 60-80 degreeC. Because it is a vending machine, the condensation temperature is set to about 80 ° C, the pull-up time for heating the temperature of beverage cans from room temperature to a hot temperature of about 55 ° C is shortened, and the temperature of the pulled-up beverage cans is reduced to about When maintaining at a hot temperature of 55 ° C., the compressor can be operated almost continuously at a condensation temperature of about 60 ° C., thereby reducing the heating loss associated with the intermittent operation of the compressor and increasing the efficiency.

  The invention according to claim 3 of the present invention uses the inverter compressor according to claim 1 or 2, wherein the minimum heating capacity at an evaporation temperature of 0 ° C. and a condensation temperature of 60 ° C. is 100 to 300 W. Therefore, when maintaining the temperature of a pulled-up beverage can, etc. at a hot temperature of about 55 ° C., the minimum heating capacity is reduced by reducing the number of revolutions of the compressor to 100 to 100 ° C. By setting it to 300 W, even if the compressor is operated almost continuously, it is not necessary to discharge the extra heating capacity to the outside of the cabinet, and high efficiency can be achieved.

  The invention according to claim 4 of the present invention is the invention according to any one of claims 1 to 3, wherein the compressor uses R134a as a refrigerant, and has an evaporation temperature of −30 ° C. and a condensation temperature of 40 ° C. Since it is a vending machine using a heating system characterized by sharing main components with a low-temperature reciprocating compressor having a refrigerating capacity of 50 to 300 W, the compression used in a normal air-cooled condenser In addition to ensuring durability at high condensing temperatures that exceed the limits of the machine and improving efficiency at low capacity, a highly versatile and low-cost compressor can be realized.

  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 refrigerant circuit diagram of the vending machine according to the first embodiment, FIG. 2 is a diagram illustrating a working pressure range of the compressor according to the first embodiment, and FIG. 3 is a diagram illustrating the capability of the compressor according to the first embodiment. FIG. 4 is a diagram showing the efficiency of the compressor according to the first embodiment, and FIG. 5 is a sectional view of the compressor according to the first embodiment.

  As shown in FIG. 1, the vending machine of the present invention includes a storage chamber composed of a hot / cold switching chamber 1, a cold dedicated chamber 2, and a second cold dedicated chamber 3, and uses R600a as a refrigerant, and a reciprocating type for high temperature. The hot / cold switching chamber 1 includes a compressor 20, a switching chamber condenser 21 installed in the hot / cold switching chamber 1, a switching chamber evaporator 22 installed outside the storage chamber, and a heating expansion valve 23. Has a heating system dedicated to heating.

  The switching chamber condenser 21 is in the form of a fin tube heat exchanger like the indoor heat exchanger 4, the evaporator 5, and the second evaporator 6, but gives priority to high condensing capacity without considering frost formation. Thus, 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 switching chamber evaporator 22 is designed in the same manner as the indoor heat exchanger 4, the evaporator 5, and the second evaporator 6 in consideration of frost formation at a low outside air temperature.

  The heating expansion valve 23 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 rise of the condensing temperature can be improved by increasing the opening of the heating expansion valve 23 and increasing the circulation rate.

  Here, the high-temperature reciprocating compressor 20 is obtained by dropping refrigerant R600a and mineral oil-based refrigerating machine oil into a low-temperature reciprocating compressor used in a household refrigerator using R134a as a refrigerant. 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 the condensing temperature of 54.4 ° C. and the evaporation temperature of −23.3 ° C., which are standard conditions. Can do.

  FIG. 2 is a diagram comparing the working pressure range of the compressor of the present invention with the working pressure range of a low-temperature reciprocating compressor used in a domestic refrigerator. In FIG. 2, Conventional Example A is a low-temperature reciprocating compressor that uses R134a as a refrigerant and is used in a household refrigerator. Generally, the evaporation temperature is −40 to −5 ° C., the upper limit of the condensation temperature is 60 ° C., and the compression ratio is 12 or less. Used in the pressure range. Further, Conventional Example B is a low-temperature reciprocating compressor that is used in a household refrigerator using R600a as a refrigerant, and generally has an evaporation temperature of −40 to −5 ° C., an upper limit of condensation temperature of 60 ° C., as in Conventional Example A. Used in a pressure range with a compression ratio of 12 or less. The reason why the working pressure ranges of the conventional example A and the conventional example B are different is that the pressure at the same saturation temperature is relatively lower in R600a than in R134a.

  On the other hand, as shown in FIG. 2, the reciprocating compressor 20 for high temperature of the present invention uses R600a as a refrigerant, and is used in a pressure range of an evaporation temperature of −10 to + 10 ° C. and an upper limit of the condensation temperature of 75 ° C. Since this pressure range is within the range of the low-temperature reciprocating compressor used in the home refrigerator using R134a shown in the conventional example A as a refrigerant, it can be operated without any major problems. Therefore, the high-temperature reciprocating compressor 20 of the present invention is a drop-in refrigerant R600a and mineral oil-based refrigerating machine oil to the low-temperature reciprocating compressor used in a household refrigerator using R134a shown in the conventional example A as a refrigerant. And use it.

  3 and 4 are diagrams showing the heating capability and the heating efficiency of the compressor of the present invention. The values shown in FIGS. 3 and 4 are actual calorimeter values of the compressor alone at the condensation temperature of 60 ° C. Here, the cylinder volume of the compressor of the conventional example A is about ½ of the cylinder volume of the conventional example B, and the heating capacity and the heating efficiency of the conventional example A are substantially equal to those of the conventional example B at the same operating temperature. is there.

  As shown in FIGS. 3 and 4, the heating capacity of the compressor of the present invention is about ½ that of the compressor of the conventional example B, but it is equal to or higher than that in the high temperature region of the evaporation temperature −10 to + 10 ° C. Efficiency can be achieved. This is because the compressors of the conventional example A and the conventional example B are designed so that the efficiency is optimal in a low temperature range of an evaporation temperature of −30 to −15 ° C., and therefore the compressor of the present invention is changed to an evaporation temperature of −30. When used in a low temperature range of -15 ° C, the reduction in work is greater than the reduction in fixed loss such as sliding loss at the bearings, which is significantly more efficient than the compressors of Conventional Example A and Conventional Example B. Decreases. Similarly, if the compressors of the conventional example A and the conventional example B are used as they are in the high temperature range of the evaporation temperature −10 to + 10 ° C., the amount of work becomes excessive and the sliding loss at the bearing increases abnormally, or the motor is driven. The torque becomes insufficient, resulting in a decrease in efficiency.

  Therefore, R600a having a low volume capacity is dropped into a low-temperature reciprocating compressor that uses R134a shown in the conventional example A as a refrigerant and is used in a household refrigerator, and in a high temperature region where the evaporation temperature is −10 to + 10 ° C. By using this, it is possible to secure a work amount commensurate with a fixed loss such as a sliding loss at the bearing, so that the compressor of the present invention is equivalent to the compressor of the conventional example B as shown in FIGS. The above efficiency can be achieved.

  Furthermore, as shown in FIG. 2, since the compressor of the present invention can be used in the pressure range shown in the conventional example A, the compressor can be operated without problems even at a condensation temperature of 75 to 80 ° C. higher than the conventional one, and is high. Heating efficiency can be maintained. Note that if the condensation temperature exceeds 80 ° C, the discharge gas temperature greatly exceeds 100 ° C, and there is a concern about thermal deterioration of the circulating refrigeration oil, etc., so pay attention to the discharge gas temperature during operation and the temperature rise of the compressor itself. Should.

  FIG. 5 is a sectional view of the high-temperature compressor 20 of the present invention.

  As shown in FIG. 5, the high-temperature compressor 20 of the present invention is installed in a hermetic container 101 on a refrigerator oil 102, a pair of electric elements 105 with a stator 103 and a rotor 104, and the electric element 105. The compression element 106 is housed.

  Next, the detailed configuration and operation of the compression element 106 will be described below.

  The crankshaft 110 has a main shaft portion 111 into which the rotor 104 is press-fitted and fixed, and an eccentric portion 112 formed eccentric to the main shaft portion 111. The cylinder block 120 includes a compression chamber 122 and a bearing portion 123 that indicates the main shaft portion 111. The piston 130 is fitted into the compression chamber 122 and is connected to the eccentric portion 112 by a connecting means 131.

  The capacity of the compressor is determined by the product of the rotational speed of the crankshaft 110 and the cylinder volume. The cylinder volume is the volume in the compression chamber 122 excluded by the piston 130 and is determined by the amount of eccentricity of the eccentric portion 112 and the outer diameter of the piston 130. The compressor of the present invention has the same compression element and electric element as the low-temperature reciprocating compressor used in a household refrigerator using R134a shown in the conventional example A of FIGS. 3 and 4 as a refrigerant. The eccentric amount of the eccentric portion 112 and the outer diameter of the piston 130 are included.

  The balance weight 133 in which the iron plates are laminated is fixed to the stator 104. The valve plate 135 seals the end face of the compression chamber 122, and the head 136 that forms the high-pressure chamber is fixed to the anti-compression chamber 122 side of the valve plate 135. The suction tube 139 is fixed to the sealed container 101 and guides the refrigerant gas evaporated in the switching chamber evaporator 22 to the suction muffler 140 in the sealed container 101. The suction muffler 140 forms a silencing space 142 that reduces noise caused by the inflow of refrigerant gas.

  The refrigerant gas flowing into the suction muffler 140 is sucked into the compression chamber 122 through a suction valve (not shown) fixed to the valve plate 135, and a part of the suction muffler 140 communicates with the sealed container 101. As a result, the inside of the sealed container 101 is kept at the evaporation pressure. The refrigerant gas compressed in the compression chamber 122 flows out into the head 136 through a discharge valve (not shown) fixed to the valve plate 135 and is a discharge pipe (not shown) fixed to the sealed container 101. ) To the switching chamber condenser 21.

  The suspension spring 150 is mounted between the snubber bar 152 fixed to the hermetic container 101 and the snubber bar 153 fixed to the stator 103 of the electric element 105, so that the electric element 105 and the compression element 106 are elastic with respect to the hermetic container 101. To instruct. The electric power supplied from the commercial power source 62 is supplied to the electric element 105 via the control circuit 61 and the inverter 62, and the rotor 104 and the crankshaft 110 of the electric element 105 are rotated at an arbitrary rotation speed.

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

  When the hot / cold switching chamber 1 is cooled, the compressor 8 is driven after the high temperature compressor 20 is stopped. The refrigerant discharged from the compressor 8 is condensed in the outdoor heat exchanger 7 and then decompressed by the expansion valve A9, the expansion valve B10, and the expansion valve C11, respectively, and the switching chamber evaporator 20, the evaporator 5, and the second To the evaporator 6. Then, the refrigerant evaporated in the switching chamber evaporator 20, the evaporator 5, and the second evaporator 6 is returned to the compressor 8.

  At this time, the storage chamber that has reached a predetermined temperature among the hot / cold switching chamber 1, the cold dedicated chamber 2, and the second cold dedicated chamber 3 closes the expansion valve A9, the expansion valve B10, and the expansion valve C11. Stop supplying the refrigerant. Further, when all the storage rooms reach a predetermined temperature, the operation of the compressor 8 is stopped.

  Next, when heating the hot / cold switching chamber 1, the compressor 8 is operated while the expansion valve A9 is closed, and the cooling of the cold dedicated chamber 2 and the second cold dedicated chamber 3 is continued. The high temperature compressor 20 is driven. The refrigerant discharged from the high-temperature compressor 20 is condensed by the switching chamber condenser 21, then decompressed by the heating expansion valve 23, and supplied to the switching chamber evaporator 22. Then, the refrigerant evaporated in the switching chamber evaporator 22 is refluxed to the high temperature compressor 20.

  At this time, for example, when the outside air temperature is 15 ° C., the heat load when the hot / cold switching chamber 1 is stable is about 100 to 200 W, so the high temperature compressor 20 has an evaporation temperature of −10 to −5 ° C. and a condensation temperature of 60 to 70. It is controlled to continuously operate at a low rotation speed of 42 rps under a pressure condition of ° C. This is because, if controlled to a higher evaporation temperature, higher efficiency can be achieved during continuous operation, but operation is performed with a higher capacity than the heat load during stable operation of the hot / cold switching chamber 1. In this case, the high-temperature compressor 20 needs to be intermittently operated, and wasteful operation from the stop state until the temperature of the switching chamber condenser 21 reaches a predetermined temperature occurs, resulting in a decrease in efficiency as a whole.

  For example, when pulling up at an outside air temperature of 15 ° C., it is necessary to heat the hot / cold switching chamber 1 at about 400 W. In this case, the high-temperature compressor 20 is controlled so as to continuously operate at a high rotation speed of 72 rps under a pressure condition of an evaporation temperature +0 to + 5 ° C. and a condensation temperature of about 75 ° C. Until the temperature in the hot / cold switching chamber 1 rises, the temperature difference between the condensing temperature of the switching chamber condenser 21 and the indoor air is large, so that a large condensing capacity can be secured, so the high temperature compressor 20 is also highly capable. Driving is possible.

  Therefore, as the temperature in the hot / cold switching chamber 1 rises during pull-up, it is necessary to adjust the capacity by sequentially reducing the rotational speed of the high-temperature compressor 20 to 42 rps. Desirably, a temperature sensor for detecting the condensing temperature of the switching chamber condenser 21 is provided, and when the condensing temperature of the switching chamber condenser 21 exceeds a predetermined value, control for lowering the rotational speed of the high-temperature compressor 20 is better. .

  In this embodiment, the minimum rotational speed of the high-temperature compressor 20 is 42 rps, but the cylinder volume and the minimum rotational speed are set so that the heating capacity at an evaporation temperature of 0 ° C./condensation temperature of 60 ° C. is 100 to 300 W. Is selected, there is no need to perform intermittent operation even when the outside air temperature is stable at 15 ° C., and efficient operation can be realized. Further, in order to increase the heating efficiency, it is desirable to reduce the heating capacity to around 100 W by reducing the minimum number of revolutions as long as the load resistance of the bearing portion allows.

  Also, in this embodiment, a low-temperature reciprocating compressor used in a household refrigerator using R134a shown in the conventional example A as a refrigerant, and a refrigerant R600a and mineral oil-based refrigeration oil dropped in are compressed for high temperature. Although mounted as the machine 20, the shape of the suction muffler, the head, the discharge valve, the suction valve, and the like can be changed in accordance with the thermophysical properties of the refrigerant. Moreover, organic materials, such as the insulating material of the stator of an electrically-driven element, can be changed according to the chemical characteristic of a refrigerant | coolant or refrigerator oil.

  As described above, the present embodiment has a dedicated heating system for heating the hot / cold switching chamber separately from the cooling means for the cold dedicated chamber and the second cold dedicated chamber. The system is equipped with a high-temperature reciprocating compressor that uses R600a as a refrigerant, an in-compartment condenser, and an out-of-compartment evaporator. As a result, the compression ratio can be reduced while maintaining the high temperature condition of the evaporation temperature −10 to 10 ° C., and a large amount is produced by using a high-temperature reciprocating compressor using R600a as a refrigerant. Using the main components of a low-temperature reciprocating compressor using R134a as a refrigerant, ensuring the durability and pressure of the compressor under severe heating conditions such as an evaporation temperature of -10 to 10 ° C and a condensation temperature of 60 to 80 ° C Efficiency of the machine can be easily realized.

  As described above, the heating system of the vending machine according to the present invention uses a high-temperature reciprocating compressor using R600a as a refrigerant, and has a severe evaporation temperature of −10 to 10 ° C. and a condensation temperature of 60 to 80 ° C. A small-capacity and high-efficiency heating system can be easily realized under heating conditions, so labor savings in small-capacity heating energy such as showcases that store hot and cold beverages at the same time and cup vending machines that supply small amounts of hot water It can also be applied to applications that require

Refrigerant circuit diagram of vending machine according to Embodiment 1 of the present invention The figure which shows the operating pressure range of the compressor of the vending machine of the embodiment The figure which shows the capability of the compressor of the vending machine of the embodiment The figure which shows the efficiency of the compressor of the vending machine of the embodiment Sectional view of the compressor of the vending machine of the embodiment Refrigerant circuit diagram of a conventional vending machine

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot / cold switching room 2 Cold exclusive room 3 Second cold exclusive room 20 High temperature compressor 21 Switching room condenser 22 Switching room evaporator 23 Heating expansion valve

Claims (4)

A heating system that uses R600a as a refrigerant, includes an internal condenser, an external evaporator, and a high-temperature reciprocating compressor, and maintains the internal temperature at 50 to 70 ° C, and a vending machine using the heating system . The heating system according to claim 1 and a vending machine using the same, wherein the normal evaporation temperature is -10 to 10 ° C and the normal condensation temperature is 60 to 80 ° C. The heating system according to claim 1 or 2, and an automatic vending machine using the same, wherein an inverter compressor having a minimum heating capacity of 100 to 300 W at an evaporation temperature of 0 ° C and a condensation temperature of 60 ° C is used. The compressor is characterized in that R134a is used as a refrigerant, and main components are shared with a low-temperature reciprocating compressor having a refrigerating capacity of 50 to 300 W at an evaporation temperature of -30 ° C and a condensation temperature of 40 ° C. The heating system according to any one of 1 to 3 and a vending machine using the heating system.

Images