JP2011127848A - Refrigerant circuit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerant circuit of an automatic vending machine, of low costs and small power consumption by limiting usage of a heater. <P>SOLUTION: In this refrigerant circulation circuit provided with a heating/cooling circulation circuit configured by connecting a compressor, a second internal heat exchanger for heating the inside, a second expanding means, and a first internal heat exchanger for cooling the inside by piping, and connecting a return pipe with the compressor in a mode that a refrigerant is returned from the first internal heat exchanger, together with a cooling circulation circuit configured by connecting the compressor, an external condenser, a first expanding means and the first internal heat exchanger by piping, and connecting the return pipe with the compressor in a mode that the refrigerant is returned from the first internal heat exchanger, a process pipe and the return pipe of the compressor are connected, and a distribution ratio to the process pipe and the return pipe is adjusted by a distribution adjusting means, thus efficiency of the refrigerant circuit is increased. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a refrigerant circuit of a vending machine or the like that cools or heats a product such as a beverage placed in a container such as a can, a bottle, a pack, or a plastic bottle for sale.

  Reducing carbon dioxide emissions has become a challenge with recent global warming, and energy-saving vending machines have been developed. As one of the methods, a heat pump type vending machine that uses the heat of the condenser, which has been exhausted in the past, to heat the inside of the cabinet has attracted attention (for example, see Patent Document 1).

  In this type of vending machine, a plurality of solenoid valves are installed in each heat exchanger inside and outside the warehouse, and by switching the solenoid valves, the heat exchanger in the warehouse acts as a condenser to operate the heat pump. I do. For example, when two rooms are heated and one room is cooled, the heat exchanger outside the chamber is paused, the heat exchanger inside the chamber to be heated acts as a condenser, and the heat exchanger inside the chamber to be cooled is Heat pump operation is performed by switching the solenoid valve so that it acts as an evaporator.

JP 2001-109942 A

  However, in this type of vending machine, when the outside air temperature is low, a heater is used because the condensation temperature of the internal heat exchanger that acts as a condenser is lowered. Heating by the heater is inferior in thermal efficiency as compared with heating by heat pump operation. Therefore, if the ratio of using the heater is increased, the power consumption is correspondingly increased.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a refrigerant circuit such as a vending machine with low power consumption by solving the above-described problems and limiting the use of a heater as much as possible. .

In order to achieve the above object, a refrigerant circuit according to claim 1 of the present invention includes:
A compressor that compresses the refrigerant, an outdoor condenser that condenses the refrigerant, a first expansion means that expands the refrigerant, and a first indoor heat exchanger that evaporates the refrigerant and cools the room are connected by piping. A cooling circulation circuit in which a return pipe is connected to the compressor in a manner in which the refrigerant is returned from the first indoor heat exchanger, and the compressor and the refrigerant are condensed to heat the interior of the second chamber The indoor heat exchanger, the second expansion means for expanding the refrigerant, and the first indoor heat exchanger for evaporating the refrigerant to cool the room are connected by piping, from the first indoor heat exchanger In a refrigerant circulation circuit that constitutes a heating / cooling circulation circuit in which a return pipe is connected to the compressor in a manner to return the refrigerant, the compressor includes a piston cylinder part that compresses the refrigerant therein, and an inside of the piston cylinder part Flowing compressed refrigerant A refrigerant outflow portion that has an opening inside the compressor and a refrigerant inflow portion into which the refrigerant to be compressed is introduced, a discharge pipe that is directly connected to the refrigerant outflow portion, and In a mode communicating with the opening of the refrigerant inflow portion, a suction pipe installed in the vicinity of the opening and in a mode communicating with the opening of the refrigerant inflow portion are installed at positions separated from the suction pipe. And a pipe from the return pipe is connected to the inlet, and a pipe from the process pipe and the suction pipe is connected to the outlet, and flows out to the process pipe and the suction pipe. A refrigerant circuit comprising a distribution adjusting means for adjusting the amount of refrigerant to be made.

  A refrigerant circuit according to a second aspect of the present invention is the refrigerant circuit according to the first aspect, wherein an outside temperature sensor that detects an outside temperature, an indoor temperature sensor that detects an indoor temperature, and cooling and heating by the indoor temperature sensor. The control means determines the distribution operation amount of the distribution adjustment means based on the outside air temperature, and the distribution amount based on the indoor temperature of the room to be cooled and the indoor temperature of the room to be heated. Is corrected, and the amount of refrigerant flowing out to the process pipe and the suction pipe is distributed.

  According to a first aspect of the present invention, there is provided a refrigerant circuit comprising: a suction pipe installed at a position near an opening of a refrigerant inflow portion of a compressor; and a process installed at a position separated from the opening of the refrigerant inflow portion. The pipe from the return pipe is connected to the inlet, the pipe from the process pipe and the suction pipe is connected to the outlet, and the amount of refrigerant flowing out to the process pipe and the suction pipe is adjusted By providing the distribution adjusting means, the refrigerant flowing from the process pipe rises in temperature before being sucked before the compressor compression step, so that the refrigerant flows into the process pipe and the suction pipe. By adjusting the distribution ratio of the refrigerant to be used, it is possible to secure an appropriate degree of superheat, condensing temperature and evaporation temperature. It can be kept low.

  According to a second aspect of the present invention, the refrigerant circuit determines the distribution operation amount of the distribution adjusting means based on the outside air temperature, and corrects the distribution amount based on the indoor temperature of the room to be cooled and the indoor temperature of the room to be heated. By adjusting the distribution ratio of the refrigerant flowing out to the process pipe and the suction pipe, the superheat degree, the condensation temperature and the evaporation temperature can be adjusted more finely, so that the cooling and heating efficiency can be improved.

1 is a perspective view showing a vending machine according to Embodiment 1 of the present invention. Sectional drawing of the vending machine shown in FIG. 1 is a refrigerant circuit diagram according to Embodiment 1 of the present invention. FIG. It is a schematic diagram of the compressor of the vending machine shown in FIG. 1, (a) is a top view, (b) is a front view, (c) is a sectional view indicated by AA, and (d) is a sectional view indicated by BB. FIG. 4 is a Mollier diagram during operation shown in FIG. 3. The block diagram of a control apparatus. The operation table of control which shows the amount of operation of the distribution valve by outside temperature. The control operation | movement table | surface which shows the correction amount of the operation amount of the distribution valve by the internal temperature. The circuit diagram which shows the flow of the refrigerant | coolant in the cooling single operation which cools all three chambers. Circuit diagram showing refrigerant flow in heat pump operation for heating two chambers and cooling one chamber

Exemplary embodiments of a refrigerant circuit in a vending machine according to the present invention will be explained below in detail with reference to the accompanying drawings. The present invention is not limited to the first embodiment.
In the perspective view of FIG. 1, the cross-sectional view of FIG. 2, and the refrigerant circuit diagram of FIG. 3, the vending machine includes a main body cabinet 10 formed as a rectangular heat insulator having an open front surface, and an exterior provided on the front surface thereof. The door 20 and the inner door 30 and the inside of the main body cabinet 10 are partitioned and formed by the bottom plate 11 in two upper and lower stages, and the upper part is partitioned by, for example, two heat-insulating partition plates 40w, three independent product storage boxes 40a and 40b, 40 c, a machine room 50 for storing the cooling / heating unit 60 for cooling or heating the product storage units 40 a, 40 b, and 40 c at the lower part, and the inside of the outer door 20, and in the product storage units 40 a, 40 b, 40 c And a control means 90 for controlling the cooling and heating operation of the vending machine by the temperature sensors Ta, Tb and Tc.

  More specifically, the outer door 20 is used to open and close the front opening of the main body cabinet 10 and is not shown in the figure. Product display room, selection button for selecting the product to be sold, money slot for inserting money, product outlet 21 for taking out the paid-out product, etc. Is arranged. Reference numeral 22 denotes an intake / exhaust port.

  The inner door 30 opens and closes the front surfaces of the product storage units 40a, 40b, and 40c to keep the products in the interior warm. The inner door 30 is a box-shaped structure that is divided into upper and lower stages and has a heat insulator inside. The upper inner door 30a is pivotally supported by the outer door 20 at one end and engaged with the outer door 20 at the other end, and the upper inner door 30a is opened simultaneously with the opening of the outer door 20 to replenish the goods. To make it easier. The lower inner door 30b is in a closed state when one end is pivotally supported on the main body cabinet 10 and the other end is hooked on the main body cabinet 10 with a latch (not shown) and the outer door 20 is opened. This prevents the cooled or heated air in the product storage boxes 40a, 40b, and 40c from flowing out, and can be opened as needed during maintenance.

  The product storage units 40a, 40b, and 40c are for storing products such as canned beverages and beverages containing plastic bottles at a desired temperature, and the capacity of the storage units is the product storage units 40a, 40c. , 40b in a large manner. In this embodiment, the product storage 40a is exclusively used for cooling, and the product storages 40b and 40c are also used for cooling and heating. The product storage racks 40a, 40b, and 40c store the products in a manner that they are arranged in the vertical direction, and are provided with a product storage rack R that includes a product delivery mechanism for discharging the products one by one in response to a sales signal. There is a product carry-out chute 42 for carrying the discharged product S to the sales port 21 of the outer door through a carry-out door 31 installed in the inner door 30b.

  In-product temperature sensors Ta, Tb, and Tc are installed below the product storage units 40a, 40b, and 40c, and the in-compartment temperature sensors Ta, Tb, and Tc detect the internal temperature of the product storage units 40a, 40b, and 40c. Is for.

An outside air temperature sensor To is installed inside the machine room 50, and the outside air temperature sensor To is for detecting the temperature of the outside air.
The cooling / heating unit 60 includes a compressor 61, a condenser 62, a first expander (expansion means) 63, a second expander (expansion means) 79, a flow divider 64, an accumulator 69, an auxiliary device in the machine room 50. A heat exchanger 76, a relief valve 77, a three-way adjusting valve (distribution adjusting means) 81 are provided, and an evaporator (first indoor heat exchanger) 65a, a heat exchanger inside the cabinet, straddling the bottom plate 11 Each of the devices 65b and 65c (also used as the first and second indoor heat exchangers) is connected by a refrigerant pipe, and has heaters 66b and 66c that are heated by electrical energization. The cooling / heating unit 60 cools or heats the product S in the product storage rack R by circulating air that has been cooled or heated inside the room (inside the room) according to the operation mode of cooling and heating.

  The compressor 61 for cooling and heating is for compressing the refrigerant and circulating it in the circuit. During the cooling operation, the evaporation temperature is about −10 ° C., the condensation temperature is about 40 ° C., and during the heating operation, An evaporation temperature of about −10 ° C. and a condensation temperature of about 70 ° C. are used.

  Further, as shown in the schematic diagram of FIG. 4, the compressor 61 includes a main body 61 f surrounded by thick cast iron and a gantry 61 a that fixes the compressor 61. The compressor inside 61i includes a piston cylinder part 61pc for compressing the refrigerant, a motor 61m for driving the piston, a discharge port (refrigerant outflow part) 61dp for letting out the compressed refrigerant from the piston cylinder part 61pc, and a compressor inside 61i. A suction port (refrigerant inflow portion) 61sp through which a refrigerant to be compressed is introduced and a discharge pipe 61d, which is three pipes that allow the refrigerant to flow in and out, on the outer peripheral portion of the main body 61f, a suction pipe 61s, the process pipe 61p is welded.

  The discharge pipe 61d is a pipe for discharging the refrigerant compressed in the piston cylinder part 61pc into the refrigerant circuit, and is directly connected to the piston cylinder part 61pc without being communicated with the compressor interior 61i.

  The suction pipe 61s is a pipe for sucking the refrigerant returning from the refrigerant circuit to the compressor 61 into the suction port 61sp. The suction pipe 61s is connected to the main body 61f at a position near the opening of the suction port 61sp with the opening 61spo facing the compressor interior 61i. The refrigerant sucked from the suction pipe 61s once flows into the main body 61f, and is then sucked into the suction port 61sp and compressed in the piston cylinder portion 61pc.

  The process pipe 61p is a pipe that communicates with the compressor interior 61i and is used for evacuation, refrigerant filling, refrigerant drawing, etc. in the main body 61f. The process pipe 61p is separated from the suction port 61sp as compared with the suction pipe 61s and is connected to the main body 61f with its opening 61po facing the compressor interior 61i. By using the process pipe 61p as the refrigerant suction pipe, the refrigerant flowing into the compressor interior 61i passes through the path indicated by the arrow in FIG. 4D, and is heated during that time.

  The condenser 62 is a fin tube type heat exchanger, and discharges unnecessary condensation heat during the cooling operation. A fan 62f is installed at the rear of the condenser 62. The fan 62f sucks air from the front opening of the machine chamber 50, sucks heat of condensation by the condenser 62, and absorbs exhaust heat of the compressor 61. Thus, the air is exhausted to the rear opening of the machine room 50.

The first expander 63 decompresses the refrigerant passing during the cooling operation and adiabatically expands, and is, for example, a capillary, a temperature expansion valve, or an electronic expansion valve.
The flow divider 64 is for distributing the refrigerant adiabatically expanded by the expander 63 to the evaporator 65a and the internal heat exchangers 65b and 65c.

  The evaporator 65a is for cooling the product storage 40a, and the internal heat exchangers 65b and 65c are for cooling or heating the product storage 40b and 40c. Further, the evaporator 65a and the internal heat exchangers 65b and 65c are installed at the lower part of each product storage, surrounded by a wind tunnel 167, a fan 65f is installed behind them, and a duct 167d is installed behind them. It has been installed. As for cooling and heating in the product storage, the air cooled or heated by the evaporator 65a and the internal heat exchangers 65b and 65c is blown to the product S in the product storage, as shown by the arrows in FIG. It is performed by circulating and collecting from the duct 167d.

  The heaters 66b and 66c are installed in front of the internal heat exchangers 65b and 65c, and assist the heating of the product storage units 40b and 40c. Specifically, the internal temperature is below a predetermined temperature. Energized at the time of. The heaters 66b and 66c have a smaller heat generation capacity than conventional ones, and can be omitted depending on the specifications.

  The condenser solenoid valve 68 opens and closes the refrigerant passage between the compressor 61 and the condenser 62, and the heater solenoid valves 68b and 68c are compressed between the compressor 61 and the internal heat exchangers 65b and 65c. It opens and closes the refrigerant passage. The first cooler inlet solenoid valve 70a and the second cooler inlet solenoid valves 70b and 70c open and close the expanded refrigerant passage between the flow divider 64 and the evaporator 65a and the internal heat exchangers 65b and 65c. The cooler outlet solenoid valves 72b and 72c open and close the passage of the evaporated refrigerant between the internal heat exchangers 65b and 65c and the compressor 61.

  The accumulator 69 is a sealed container for allowing the refrigerant evaporated from the evaporator 65a and the internal heat exchangers 65b and 65c to flow in, separating the gas and liquid, storing the liquid refrigerant, and returning the gaseous refrigerant to the compressor 61. is there. The accumulator 69 is also a container for storing the refrigerant remaining in the refrigerant circulation of the circuit.

The auxiliary heat exchanger 76 is a fin tube type heat exchanger, and discharges unnecessary condensation heat during heating operation.
The second expander 79 decompresses the refrigerant passing during the heating operation and adiabatically expands, and is, for example, a capillary, a temperature expansion valve, or an electronic expansion valve.

  The relief valve 77 is installed between the compressor 61 and the condenser 62. When the condenser solenoid valve 68 and the heater solenoid valves 68b and 68c fail and the compressor 61 generates abnormal pressure, Is for the condenser 62 to prevent the compressor 61 from being damaged.

  The three-way regulating valve 81 has one inlet pipe 811, two outlet pipes A 812, and outlet pipe B 813. By moving a valve (not shown) installed inside, the three-way adjusting valve 81 moves from the outlet pipe A 812 and the outlet pipe B 813. For example, an electric ball adjusting valve is used to adjust the amount of refrigerant discharged. The valve installed inside is driven by a motor 814 installed outside.

  The refrigerant circuit configuration of the cooling / heating unit 60 will be described in detail with reference to FIG. The refrigerant circuit includes a cooling circulation circuit 60A that performs only cooling in the warehouse and a heating and cooling circulation circuit 60B that simultaneously performs cooling and heating in the warehouse (performs a heat pump operation). In addition, the enclosure of the dotted line in a figure has shown typically the goods storage 40a only for cooling, and the goods storage 40b, 40c used also for cooling and heating.

The cooling circuit 60A is connected to the flow divider 64 from the discharge pipe 61d of the compressor 61 via the condenser solenoid valve 68, the condenser 62, and the first expander 63, one of the flow dividers 64 being the first. 1 is connected to the collector 67 via the cooler inlet electromagnetic valve 70a and the evaporator 65a, and the other of the flow divider 64 is the second cooler inlet electromagnetic valves 70b and 70c, the internal heat exchanger 65b, 65c, connected to the collector 67 via the cooler outlet solenoid valves 72b, 72c, and the piping from the return pipe 80 is connected to the inlet piping 811 of the three-way regulating valve 81 via the accumulator 69, and three-way adjustment The outlet pipe A812 of the valve 81 is branched into a pipe connected to the suction pipe 61s and a pipe connected to the outlet pipe B813 is connected to the process pipe 61p and connected to the compressor 61. In addition to the cooling circuit 60 </ b> A, the ring circuit 60 </ b> B is connected to the second cooler inlet electromagnetic via the heater solenoid valves 68 b and 68 c connected in parallel from the connection point between the compressor 61 and the condenser solenoid valve 68. The intermediate points (connection points) 168b and 168c between the valves 70b and 70c and the internal heat exchangers 65b and 65c are connected to the check points 71 and 71 respectively from the outlet sides of the internal heat exchangers 65b and 65c. Are connected to the distributor 64 via the auxiliary heat exchanger 76 and the second expander 79.

  Thus, the heating / cooling circulation circuit 60B is connected to the internal heat exchangers 65c, 65b from the discharge pipe 61d of the compressor 61 via the heater electromagnetic valves 68b, 68c, and is connected to the internal heat exchangers 65c, 65b. It is connected to the distributor 64 via the auxiliary heat exchanger 76 and the second expander 79 via the valves 71, 71, and from the flow divider 64 to the evaporator 65a via the first cooler inlet electromagnetic valve 70a. The circuit is connected and returns to the process pipe 61p of the compressor 61 via the collector 67, the return pipe 80, and the accumulator 69.

  The operation state of the refrigeration cycle will be schematically described by comparing the case of flowing from the return pipe 80 to the suction pipe 61s and the case of flowing from the return pipe 80 to the process pipe 61p in the Mollier diagram shown in FIG.

  When flowing from the return pipe 80 to the suction pipe 61s, the refrigerant circulates along a path indicated by a dotted line in FIG. That is, the refrigerant evaporated in the low-temperature and low-pressure gas phase at the outlet vicinity point Q1 of the evaporator 65a enters the compressor interior 61i via the return pipe 80 and the suction pipe 61s, and then from the suction port 61sp to the piston cylinder portion 61pc. , Is compressed in the piston cylinder portion 61pc, and discharged at a high temperature and high pressure at the outlet portion Q3 of the discharge port 61dp. The discharged refrigerant starts condensing from the vicinity Q4 of the inlet portions of the internal heat exchangers 65c and 65b, ends condensing near the outlet portion Q5 of the internal heat exchangers 65c and 65b, and the high-temperature and high-pressure liquid. Become a phase. This liquid-phase refrigerant expands from the inlet of the second expander 79 and enters a low-temperature and low-pressure gas-liquid two-phase state at the outlet Q6 of the second expander 79. The gas-liquid two-phase refrigerant evaporates in the evaporator 65a to be in a gas phase, and returns to the outlet vicinity point Q1 of the evaporator 65a.

  On the other hand, when flowing from the return pipe 80 to the process pipe 61p, the refrigerant circulates along a path indicated by a solid line in FIG. That is, the refrigerant evaporated in the low-temperature and low-pressure gas-phase state at the outlet vicinity point P1 of the evaporator 65a enters the compressor inside 61i via the return pipe 80 and the process pipe 61p, and is heated in the compressor inside 61i. The temperature rises and enters the inlet portion P2 of the piston cylinder portion 61pc from the suction port 61sp. At this time, the temperature is kept higher than Q2. And since the high temperature refrigerant | coolant is compressed in the piston cylinder part 61pc and will be in a high temperature / high pressure state, the refrigerant | coolant of the inside P3 of the discharge port 61dp will be in a further high temperature / high pressure state compared with Q3. That is, the condensation temperature can be kept high. Then, condensation is started at a high condensation temperature in the vicinity P4 of the inlet portions of the internal heat exchangers 65c and 65b, the condensation is ended in the internal heat exchangers 65c and 65b, and a high-temperature and high-pressure liquid phase is obtained. Become. This liquid-phase refrigerant expands from the inlet portion of the second expander 79 and enters a low-temperature and low-pressure gas-liquid two-phase state at the outlet portion P6 of the second expander 79. Then, the gas-liquid two-phase refrigerant evaporates in the evaporator 65a to be in a gas phase, and returns to the outlet vicinity point P1 of the evaporator 65a.

  Therefore, by adjusting the amount of refrigerant flowing out to the process pipe 61p and the suction pipe 61s by the three-way regulating valve 81, the refrigerant circuit can be operated between the solid line and the dotted line refrigeration cycle shown in FIG. The condensing temperature, the evaporating temperature, and the degree of superheat (temperature difference between P2 and P1, temperature difference between Q2 and Q1) can be controlled by the solid line and dotted line refrigeration cycles. Specifically, when controlling with emphasis on heating, increase the amount of refrigerant distribution to the process pipe 61p side to increase the condensation temperature and superheat, and when controlling with emphasis on cooling, on the suction pipe 61s side In addition, by increasing the distribution amount of the refrigerant and lowering the evaporation temperature and the degree of superheat, the efficiency of the refrigerant circuit can be improved and the use of the heater can be restricted. As a result, the power consumption can be kept low.

  The control means 90 controls the cooling or heating of the product storage boxes 40a, 40b, and 40c by the cooling and heating operation mode. As shown in FIG. 6, a CPU and a memory are provided inside, and control such as compressor operation of the refrigerant circuit and opening / closing of the solenoid valve is performed according to the cooling heating operation mode determined by the setting of the operation mode setting SW91. The operation mode indicates the cooling or heating operation of the product storage units 40a, 40b, and 40c by C and H, and in the order of (40a, 40b, 40c) from the left side of the product storage unit, for example, all are cooling Is described as CCC mode, and when only the right commodity storage 40c is heated, it is described as CCH mode. In addition, the control means 90 controls the temperature in the temperature chamber so as to be within the range of the upper limit temperature Tcon, the lower limit temperature Tcoff, the upper limit temperature Toff in the chamber to be heated, and the lower limit temperature Thon temperature stored in the memory. Depending on the temperatures detected by the sensors Ta, Tb, Tc, the compressor 61, the condenser solenoid valve 68, the first cooler inlet solenoid valve 70a, the second cooler inlet solenoid valve 70b, 70c, the cooler outlet solenoid valve 72b. 72c, the heater electromagnetic valves 68b, 68c, etc. are maintained at an appropriate temperature by a thermocycle operation for ON / OFF control.

  Further, the control means 90 determines the opening degree of the three-way regulating valve 81 based on the outside air temperature T as shown in the control operation table of FIG. 7, and further, the internal temperature as shown in the control operation table of FIG. To correct the valve opening of the three-way regulating valve 81.

  Specifically, as shown in FIG. 7, when the reading value (outside air temperature) T from the outside air temperature sensor To is 4 ° C. or less, the refrigerant is distributed to 50% to the outlet pipe A812 and 50% to the outlet pipe B813. Thus, the valve opening degree of the three-way adjusting valve 81 is determined. When the reading T from the outside air temperature sensor To is higher than 4 ° C. and lower than 20 ° C., the three-way regulating valve 81 is arranged so that the refrigerant is distributed to 60% to the outlet pipe A812 and 40% to the outlet pipe B813. Determine the valve opening. That is, as the outside air temperature is lower, more refrigerant flows through the process pipe 61p to increase the condensation temperature and the degree of superheat.

  Furthermore, the valve opening degree of the three-way adjusting valve 81 is corrected by the internal temperature. Specifically, from the upper limit temperature Toff in the chamber to be heated, the temperature T2 of the chamber temperature sensor in the chamber to be heated, the lower limit temperature Tcoff in the chamber to be cooled, and the temperature T1 of the chamber temperature sensor in the chamber to be cooled The correction temperature ΔT is obtained.

ΔT = (Toff−T2) − (T1−Tcoff)
Note that (Toff-T2) indicates the heating load in the chamber to be heated, and (T1-Tcoff) indicates the cooling load in the chamber to be cooled.

  As shown in FIG. 8, when the correction temperature ΔT is larger than 5 ° C., the opening degree of the three-way adjustment valve 81 is adjusted so that the refrigerant of the outlet pipe A812 increases and decreases by −10% and the outlet pipe B813 of + 10%. To do. When the correction temperature ΔT is greater than 2 ° C. and less than or equal to 5 ° C., the valve opening of the three-way regulating valve 81 is adjusted so that the refrigerant increases or decreases to −5% in the outlet pipe A812 and + 5% in the outlet pipe B813. That is, when the heating load in the warehouse is larger than the cooling load in the warehouse, the refrigerant flowing through the process pipe 61p is increased so as to increase the degree of superheating of the refrigeration cycle.

  When the operation mode is set to the CCC mode by operating the operation mode setting SW 91 in such a configuration, the control unit 90 causes the condenser solenoid valve 68, the first cooler inlet solenoid valve 70a, and the second cooler inlet solenoid valves 70b, 70c. Then, the cooler outlet solenoid valves 72b and 72c are opened, the heater solenoid valves 68b and 68c are closed, and the three-way regulating valve 81 is adjusted to flow out to the 100% outlet pipe A812. At this time, the refrigerant flows as shown by a thick line in FIG. 9. Specifically, the high-temperature refrigerant compressed by the piston cylinder portion 61 pc of the compressor 61 is discharged from the discharge pipe 61 d and condensed by the condenser 62. It becomes a liquid, expands in the expander 63 to become a low-temperature gas-liquid two-phase flow, is divided into three directions by the flow divider 64, and then flows into the evaporator 65a and the internal heat exchangers 65b and 65c. The refrigerant that has flowed in is evaporated by the evaporator 65a and the internal heat exchangers 65b and 65c to cool the product storages 40a, 40b, and 40c. The evaporated refrigerant is collected by the collector 67 and is liquidated from the return pipe 80. Gas-liquid separation is performed via the accumulator 69 that stores the refrigerant, and the gas phase enters the suction pipe 61s of the compressor 61 from the three-way regulating valve 81, and immediately passes from the suction port 61sp to the piston cylinder portion 61pc by the compressor internal body 61i. It is compressed again by the piston cylinder part 61pc and discharged.

  At this time, since the return refrigerant from the return pipe 80 enters the 100% suction pipe 61s, the refrigerant is operated in the refrigeration cycle indicated by the dotted line in FIG. 5, and as a result, the evaporation temperature is low and the degree of superheat is reduced. Driving is performed.

  Further, when the operation mode is set to the CHH mode by operating the operation mode setting SW 91, the control unit 90 opens the heater electromagnetic valves 68b and 68c and the first cooler inlet electromagnetic valve 70a, and the condenser electromagnetic valve 68, The second cooler inlet solenoid valves 70b and 70c and the cooler outlet solenoid valves 72b and 72c are closed. Then, the control means 90 determines the operation amount of the three-way adjusting valve 81 as shown in FIG. 7 by the outside air temperature sensor To, and the three-way adjusting valve 81 as shown in FIG. 8 by the internal temperature sensors Ta, Tb, Tc. Correct the operation amount. At this time, the high-temperature refrigerant compressed by the piston cylinder portion 61pc of the compressor 61 is heated by the discharge pipe 61d through the heater solenoid valves 68b and 68c and the connection points 168b and 168c as shown by the thick line in FIG. It flows into the exchangers 65b and 65c. The refrigerant flowing into the internal heat exchangers 65b and 65c condenses, heats the product storages 40b and 40c, collects through the check valves 71 and 71, and further condenses in the auxiliary heat exchanger 76 to the second. Flows into the inflator 79. The refrigerant flowing into the second expander 79 expands into a low-temperature and low-pressure gas-liquid two-phase flow, and flows into the evaporator 65a via the flow divider 64 and the first cooler inlet electromagnetic valve 70a. The refrigerant flowing into the evaporator 65a evaporates and cools the commodity storage 40a, and enters the three-way regulating valve 81 through the collector 67, the return pipe 80, and the accumulator 69. The refrigerant flowing into the three-way regulating valve 81 enters the suction pipe 61s and the process pipe 61p of the compressor 61 at the distribution ratio shown in FIGS. 7 and 8, and returns from the suction port 61sp to the piston cylinder part 61pc. At this time, the refrigerant circuit is operated between the solid line and the dotted line refrigeration cycle shown in FIG.

  As described above, the refrigerant flowing in from the process pipe 61p is heated in the compressor 61i before being sucked before the compressor 61, and the discharge temperature of the compressor 61 rises. By adjusting the distribution ratio of the refrigerant flowing into the pipe 61p and the suction pipe 61s, it is possible to secure an appropriate degree of superheat, condensation temperature, and evaporation temperature, so that the use of the heater can be restricted, resulting in low power consumption. it can.

  The distribution operation amount of the three-way regulating valve 81 is determined based on the outside air temperature To, and the distribution amount is corrected based on the indoor temperature of the room to be cooled and the indoor temperature of the room to be heated. By adjusting the distribution ratio of the refrigerant flowing into the pipe 61s, the superheat degree, the condensation temperature, and the evaporation temperature can be adjusted more finely, so that the cooling and heating efficiency can be improved.

  In the above description, the cooling and heating operation mode is described as the CHH mode. However, the same effect can be obtained in the CCH mode and the CHC mode in which heating is performed in a single product storage. In the above description, the vending machine has a two-room product storage and cooling / heating function. However, the same effect can be obtained with a vending machine that has a one-room product storage and cooling / heating function. It is done.

  As described above, the refrigerant circuit according to the present invention is suitable for a refrigerant circuit of a vending machine that sells a product such as a beverage in a container such as a can, a bottle, a pack, or a plastic bottle by cooling or heating it.

DESCRIPTION OF SYMBOLS 10 Main body cabinet 20 Outer door 30 Inner door 40a, 40b, 40c Merchandise storage 60 Cooling / heating unit 61 Compressor 61d Discharge pipe 61p Process pipe 61sp Suction port 62 Condenser 63 1st expander 64 Current divider 65a Evaporator 65b , 65c Internal heat exchanger 68 Condenser solenoid valve 68a, 68b Heater solenoid valve 70a First cooler inlet solenoid valve 70b, 70c Second cooler inlet solenoid valve 72b, 72c Cooler exit solenoid valve 79 Second Expander 80 Return pipe 90 Controller 91 Operation mode selection SW
81 3-way adjusting valve (distribution adjusting means)
811 Inlet piping 812, 813 Outlet piping A, B
814 motor

Claims (2)

A compressor that compresses the refrigerant, an outdoor condenser that condenses the refrigerant, a first expansion means that expands the refrigerant, and a first indoor heat exchanger that evaporates the refrigerant and cools the room are connected by piping. , Constituting a cooling circulation circuit formed by connecting a return pipe to the compressor in a manner to return the refrigerant from the first indoor heat exchanger,
The compressor, the second indoor heat exchanger for condensing the refrigerant to heat the room, the second expansion means for expanding the refrigerant, and the first indoor heat exchange for cooling the room by evaporating the refrigerant. In a refrigerant circulation circuit that constitutes a heating and cooling circulation circuit in which a return pipe is connected to the compressor in a mode in which the refrigerant is returned from the first indoor heat exchanger by connecting a pipe to the compressor,
The compressor includes a piston cylinder portion that compresses the refrigerant therein, a refrigerant outflow portion that causes the compressed refrigerant to flow out of the piston cylinder portion, and a refrigerant that has an opening inside the compressor and into which the refrigerant to be compressed is introduced. An inflow portion,
Outside the compressor, a discharge pipe directly connected to the refrigerant outflow portion, a suction pipe installed near the opening in a manner communicating with the opening of the refrigerant inflow portion, and the refrigerant inflow In a mode communicating with the opening of the part, having a process pipe installed at a position separated from the suction pipe,
Distribution adjusting means for adjusting the amount of refrigerant flowing out to the process pipe and the suction pipe by connecting the pipe from the return pipe to the inlet, and connecting the pipe from the process pipe and the suction pipe to the outlet A refrigerant circuit characterized by being provided. An outside air temperature sensor for detecting the outside air temperature, an indoor temperature sensor for detecting the room temperature, and a control means for controlling the cooling / heating operation by the room temperature sensor,
The control means determines the distribution operation amount of the distribution adjustment means based on the outside air temperature, and corrects the distribution amount based on the indoor temperature of the room to be cooled and the indoor temperature of the room to be heated, so that the process pipe and the suction The refrigerant circuit according to claim 1, wherein an amount of refrigerant flowing out to the pipe is distributed.

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