JP2009076028A - Vending machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vending machine which suppresses a decrease in a cooling/heating capability due to a reduction in the amount of a circulating refrigerant for a refrigeration cycle as a leaked refrigerant is caused to flow into a heating heat exchanger and stay therein when a refrigerant leaks from a closed solenoid valve while a heating operation stops. <P>SOLUTION: In the vending machine having a compressor 61, a condenser 62 provided outside a cabinet, an expanding means 63, a distributor 64 for distributing a refrigerant from the expanding means, heating heat exchangers 66b and 66c which form a refrigeration cycle in a plurality of evaporators 65a, 65b and 65c, are connected between an inlet of the compressor and an inlet of the condenser and are provided in the cabinet to condense the refrigerant, and first solenoid valves 68b and 68c between the compressor and the heating heat exchangers, a bypass circuit that connects second solenoid valves 73b and 73c and a second expanding means 72 is provided between the first solenoid valves and the distributor to collect the leaked refrigerant in the refrigeration cycle. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to 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 after being cooled or heated in a refrigerant circuit.

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).
However, this vending machine uses the internal heat exchanger as an evaporator during cooling and as a condenser during heating, so the flow of refrigerant changes depending on the cooling and heating operation mode of the vending machine. As a result, there is a problem that the piping of the refrigeration circuit becomes complicated, resulting in high costs.
In addition, in order to reduce the manufacturing cost by using CO ₂ refrigerant, it is known that a refrigerant circuit is configured by providing two piping circuits for a cooling heat exchanger and a heating heat exchanger in one commodity storage. (For example, refer to Patent Document 2).
JP 2002-298210 A JP 2006-11493 A

However, when the refrigerant circuit described in Patent Document 2 is used at a temperature within the criticality, there are the following problems.
1) When the refrigerant leaks from the solenoid valve that is closed during the suspension of the heating operation, the leaked refrigerant flows into the heating heat exchanger. At this time, since the product storage is in a cooling atmosphere, the leaked refrigerant that has flowed into the heating heat exchanger is condensed into a liquid, so that the amount of circulating refrigerant is reduced and the cooling heating capacity is reduced.
2) Especially when changing the operation mode for heating the two chambers in the three-chamber operation, the heat exchange capacity is insufficient in the heating heat exchanger in the product storage, and therefore the refrigerant temperature does not fall sufficiently. As a result, the cooling capacity is insufficient and the power consumption increases.
3) Since the ratio of the heat exchangers used on the cooling side and the heating side changes when the cooling and heating operation modes are changed, the appropriate amount of refrigerant varies depending on the operation mode. For this reason, since it cannot optimize in each operation mode, the power consumption as a whole increases.
In view of the above circumstances, an object of the present invention is to solve the problem 1), to efficiently perform a heat pump operation, and to provide a vending machine with low power consumption.
Another object of the present invention is to solve the problem 1), solve the problems 2) and 3), perform a heat pump operation more efficiently, and provide a vending machine with low power consumption. For the purpose.

In order to achieve the above object, a vending machine according to claim 1 of the present invention is a vending machine having a plurality of product storages for cooling or heating the product storage in an operation mode. A compressor that compresses the refrigerant, a condenser that is provided outside the refrigerator and condenses the refrigerant, an expansion means that expands the refrigerant, a distributor that distributes the refrigerant expanded by the expansion means, and a refrigerant that is provided inside the refrigerator and evaporates the refrigerant A heating heat exchanger that constitutes a refrigeration cycle with a plurality of evaporators, is connected between an inlet of the compressor and an inlet of the condenser, and is provided in a warehouse to condense the refrigerant; and the compressor In the vending machine having a first solenoid valve between the heating heat exchanger and the heating heat exchanger, the heating heat exchanger and the expansion means outlet side pipe line are connected via a second expansion means. It has the pressure-reduction pipe line which carries out.
The vending machine according to a second aspect of the present invention is the vending machine according to the first aspect, wherein the pressure reducing pipe connects the inlet side of the heating heat exchanger and the outlet side of the expansion means via a second electromagnetic valve. It is a connected bypass line.
The vending machine according to a third aspect of the present invention is the vending machine according to the first aspect, wherein the pressure reducing pipe is connected to the heating heat exchanger outlet side pipe and the expansion means outlet side via a third electromagnetic valve. It is characterized by being a bypass line connected between.

The vending machine according to claim 4 of the present invention is the vending machine according to claim 1, wherein an external heat exchanger is provided outside the product storage, and the decompression pipe is connected to the external heat exchanger via the external heat exchanger. It is a pipe line connected between the heating heat exchanger outlet side pipe line and the expansion means outlet side.
According to a fifth aspect of the present invention, the vending machine according to the fourth aspect is characterized in that the external heat exchanger has a structure integrated with the condenser.
In addition, the vending machine according to claim 6 of the present invention is characterized in that, in claim 5, the external heat exchanger is arranged on the windward side of the condenser.
A vending machine according to claim 7 of the present invention is the vending machine according to claim 4, wherein the fourth and / or fifth electromagnetic valve is opened and closed on the downstream side of the condenser and the external heat exchanger. Control means for controlling is provided, and the control means controls the refrigerant circulation amount by opening and closing the fourth and / or fifth electromagnetic valve.
The vending machine according to an eighth aspect of the present invention is the vending machine according to the seventh aspect, wherein the second expansion means is an electronic expansion valve, and the control means is at the start of simultaneous heating / cooling operation or cooling. When switching from single operation to simultaneous heating / cooling operation or after a certain time of operation during simultaneous heating / cooling operation, the electronic expansion valve is set to a predetermined opening, and the first side on the inlet side of the heating heat exchanger is set. The amount of refrigerant circulating is controlled by opening the solenoid valve and then closing the solenoid valve at the condenser inlet.

The vending machine according to claim 9 of the present invention is the vending machine according to claim 7, wherein the second expansion means is an electronic expansion valve, and the control means is at the start of the cooling single operation or is heated and cooled. At the time of switching from simultaneous operation to cooling single operation, or after a certain time operation during cooling single operation, the solenoid valve on the inlet side of the condenser is opened, and then the first solenoid valve on the inlet side of the heating heat exchanger is opened. The solenoid valve is closed, the fourth solenoid valve is closed, and the electronic expansion valve is fully opened to control the refrigerant circulation amount.
The vending machine according to claim 10 of the present invention is the vending machine according to claim 7, further comprising condensation temperature detection means for detecting the condensation temperature of the heating heat exchanger, and the control means is detected by the condensation temperature detection means. The refrigerant circulation amount is controlled by opening / closing the fourth and / or fifth electromagnetic valve based on the condensed temperature.
The vending machine according to claim 11 of the present invention is the vending machine according to claim 10, wherein when the condensing temperature detected by the condensing temperature detecting means is higher than a predetermined temperature, the control means The refrigerant circulation amount is controlled by closing the valve and opening the electromagnetic valve on the condenser inlet side in a time shorter than the previous operation time.
According to a twelfth aspect of the present invention, in the vending machine according to the tenth aspect, when the condensing temperature detected by the condensing temperature detecting means is lower than a predetermined temperature, the control means is the fourth electromagnetic wave. The refrigerant circulation amount is controlled by opening the valve for a predetermined time.

The vending machine according to the first to third aspects of the present invention is a vending machine having a plurality of merchandise storage boxes for cooling or heating the merchandise storage boxes according to the operation mode, and compressing the refrigerant. A condenser provided outside the refrigerator for condensing the refrigerant, an expansion means for expanding the refrigerant, a distributor for distributing the refrigerant expanded by the expansion means, and a plurality of evaporators provided inside the storage for evaporating the refrigerant. A refrigeration cycle, connected between the inlet of the compressor and the inlet of the condenser, and provided in the warehouse to condense the refrigerant, the compressor and the heating heat exchanger, In a vending machine having a first solenoid valve between the heating heat exchanger and the expansion means outlet side pipe, the pressure reducing pipe connecting the expansion means outlet side pipe via a second expansion means, Alternatively, the decompression pipe is connected to the inlet side of the heating heat exchanger and the expansion means outlet. A bypass pipe connected to the mouth side via a second electromagnetic valve, or the pressure reducing pipe is connected to the heating heat exchanger outlet side pipe and the expansion means outlet via a third solenoid valve. Because of the bypass line connected between the refrigerant and the refrigerant, the refrigerant leaking from the closed first electromagnetic valve when the heating operation is stopped passes through the third electromagnetic valve and the third expansion means to the evaporator. Since the refrigerant flows in, the refrigerant circulation rate does not decrease, so that the cooling efficiency can be maintained high.
A vending machine according to a fourth aspect of the present invention is the vending machine according to the first aspect, wherein an external heat exchanger is provided outside the product storage, and the pressure reducing line is connected to the heating heat via the external heat exchanger. Since it is a configuration that is a conduit connected between the exchanger outlet side conduit and the expansion means outlet side, in addition to the above effects, the external heat exchanger interpolates the heating heat radiation amount of the refrigeration cycle , It is possible to suppress a decrease in cooling capacity.

The vending machine according to claim 5-6 according to the present invention is the vending machine according to claim 4, wherein the external heat exchanger has a structure integrated with the condenser, and the external heat exchanger has the structure described above. Since the condenser has the common heat radiation fin 82 by being arranged on the windward side from the condenser, the heat radiation efficiency of the refrigerant flowing through the external heat exchange pipe and the condenser pipe is improved.
A vending machine according to a seventh aspect of the present invention is the vending machine according to the fourth aspect, wherein the fourth or / and fifth electromagnetic valve is controlled downstream of the condenser and the external heat exchanger, and the opening and closing of the electromagnetic valve is controlled. Control means, and the control means can appropriately adjust the refrigerant circulation amount in each operation mode by controlling the refrigerant circulation amount by opening and closing the fourth and / or fifth electromagnetic valve. Since it is possible, cooling and heating operation can be performed with high efficiency.
The vending machine according to claim 8-9 according to the present invention is the vending machine according to claim 7, wherein the second expansion means is an electronic expansion valve, and the control means is at the start of simultaneous heating / cooling operation or cooling. When switching from single operation to simultaneous heating / cooling operation or after a certain time of operation during simultaneous heating / cooling operation, the electronic expansion valve is set to a predetermined opening, and the first side on the inlet side of the heating heat exchanger is set. And then the refrigerant circulation amount is controlled by closing the solenoid valve at the condenser inlet, and the second expansion means is an electronic expansion valve, and the control means includes: Opening the solenoid valve on the condenser inlet side at the start of the cooling single operation, or when switching from the simultaneous heating and cooling operation to the cooling single operation, or after a certain time operation during the cooling single operation, Close the first solenoid valve on the inlet side of the heating heat exchanger, Closed electromagnetic valve to control the refrigerant circulation amount in the fully open the electronic expansion valve. As a result, the refrigerant stored in the condenser 62 and the evaporators 65a, 65b, and 65c during the single cooling operation is supplied to the heating heat exchangers 66b and 66c, or the stagnation and recovery leakage occurs during the single cooling operation. In addition to collecting the refrigerant, the refrigerant circulation amount necessary for the single cooling operation is ensured, so that an appropriate refrigerant circulation amount can be obtained in each operation mode such as the simultaneous cooling and heating operation and the single cooling operation, and the cooling and heating operation is enhanced. Can be done with efficiency.

A vending machine according to a tenth aspect of the present invention is the vending machine according to the seventh aspect, wherein a condensation temperature detecting means for detecting a condensation temperature of the heating heat exchanger is provided, and the control means is in accordance with the condensation temperature detected by the condensation temperature detecting means. Since the refrigerant circulation amount is gradually controlled by opening and closing the fourth solenoid valve, an appropriate refrigerant circulation amount can be obtained, and the cooling / heating operation can be performed with high efficiency.
The vending machine according to claim 11-12 of the present invention is the vending machine according to claim 10, wherein the control means closes the fourth solenoid valve when the condensation temperature detected by the condensation temperature detection means is higher than a predetermined temperature. The refrigerant circulation amount is controlled by opening the solenoid valve 68 on the inlet side of the condenser in a time shorter than the previous operation time, and the condensation temperature detected by the condensation temperature detection means is lower than the predetermined temperature. First, the fourth solenoid valve is closed for a predetermined time to control the refrigerant circulation amount to be slightly increased. Thus, even after the operation mode is switched, the refrigerant circulation amount can be finely adjusted, and the cooling / heating operation can be performed with high efficiency.

Exemplary embodiments of a vending machine according to the present invention will be described below in detail with reference to the accompanying drawings. Note that the present invention is not limited to the embodiments.
Example 1
First, a vending machine according to the first embodiment of the present invention will be described. 1 is a perspective view showing the vending machine according to the first embodiment of the present invention, FIG. 2 is a cross-sectional view of the vending machine shown in FIG. 1, and FIG. 3 shows the first embodiment of the present invention. It is the refrigerant circuit figure which concerns. 4 shows a block diagram of the control device, FIG. 5 shows a refrigerant flow in the refrigerant circuit diagram of FIG. 3, (a) is a circuit diagram showing a refrigerant flow in the operation mode CCC, and (b) is a circuit diagram. It is a circuit diagram which shows the flow of the refrigerant | coolant of operation mode CCH, (c) is a circuit diagram which shows the flow of the refrigerant | coolant of operation mode CHH.
In these drawings, the vending machine has a main body cabinet 10 formed as a rectangular heat insulator having an open front surface, an outer door 20 and an inner door 30 provided on the front surface, and an interior of the main body cabinet 10 in two directions. The bottom plate 11 is partitioned and formed at the stage, and the upper part is cooled by, for example, three independent product storage units 40a, 40b, and 40c separated by two heat insulating partition plates 40w, and the lower part product storage units 40a, 40b, and 40c are cooled or The machine room 50 for storing the cooling / heating unit 60 to be heated and the temperature sensor T in the product storage 40a, 40b, 40c are arranged inside the outer door 20 to control the cooling and heating operation of the vending machine. And a control means 90.

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.
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 pivoted at one end to the outer door 20, and the other end is engaged with the outer door 20, and the upper inner door 30a is opened at the same time as the outer door 20 is opened to facilitate replenishment of goods. It is to make. The lower inner door 30b is in a closed state when one end pivots 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. It is possible to prevent the cool air or warm air in the storage cases 40a, 40b, and 40c from flowing out, and to open as necessary during maintenance.
The product storage units 40a, 40, 40 are for storing products such as canned beverages and beverages containing plastic bottles while maintaining the 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 case 40a is exclusively used for cooling, and the product storage cases 40c and 40b 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.

The cooling / heating unit 60 connects the compressor 61, the condenser 62, the expansion valve 63, the flow divider 64, and the evaporators 65a, 65b, 65c in the warehouse across the bottom plate 11 with refrigerant pipes that constitute the refrigeration cycle. The cooling unit and a heating unit in which the compressor 61 and the heating heat exchangers 66b and 66c are connected by a refrigerant pipe, and depending on the operation mode, cool air or hot air is circulated in the cabinet to store the product storage rack R. The product S inside is cooled or heated.
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 evaporators 65a, 65b, and 65c are for cooling the product storages 40a, 40b, and 40c, and are installed at the lower part of each product storage. The heating heat exchangers 66b and 66c are installed in front of the evaporators 65b and 65c, and are for heating the product storage boxes 40b and 40c. The evaporators 65a, 65b, 65c and the heating heat exchangers 66b, 66c are surrounded by a wind tunnel 67 in each product storage 40a, 40b, 40c, a fan 65f is installed in front of them, and a duct 67d is installed in the rear. Is installed. For cooling / heating in the product storage, the air cooled or heated by the evaporators 65a, 65b, 65c and the heating heat exchangers 66b, 66c is blown to the product S in the product storage and collected from the duct 67d. Done in

The refrigerant circuit configuration of the cooling / heating unit 60 will be described in detail with reference to FIG. As shown in FIG. 3, the piping exiting from the compressor 61 is connected to a condenser 62 via electromagnetic valves 68 and 69, and the piping exiting from the condenser 62 is connected to an expansion valve 63 (capillary) via a check valve 71. It is connected to the. The piping from the expansion valve 63 (which may be an expansion means or a capillary) is connected to the flow divider 64, and is connected from the flow divider 64 to the evaporators 65a, 65b, and 65c via the electromagnetic valves 70a, 70b, and 70c. The pipes from the containers 65a, 65b, and 65c are gathered and connected to the compressor 61.
On the other hand, the piping exiting from the compressor 61 is connected to the heating heat exchangers 66b and 66c via the first electromagnetic valves 68b and 68c, and the piping exiting the heating heat exchangers 66b and 66c is connected to the check valve 71, Collected via 71 and connected to a solenoid valve 68. In addition, the piping from the electromagnetic valve 68 is connected to a bypass pipe 70 in parallel with the condenser 62 via the electromagnetic valve 74.
Further, bypass pipes 75b and 75c are connected from pipes connecting the first electromagnetic valves 68b and 68c and the heating heat exchangers 66b and 66c, and are gathered via the second electromagnetic valves 73b and 73c. It is connected to the piping between the expansion valve 63 and the flow divider 64 via the expansion valve 72 (second expansion means). The bypass pipes 75b and 75c, the second electromagnetic valves 73b and 73c, and the bypass pipe composed of the second expansion valve 72 (second expansion means) constitute a decompression pipe.

As the refrigerant, R134a is used as a refrigerant used within a critical pressure, for example, a fluorocarbon refrigerant.
The control means 90 controls cooling or heating according to the operation mode of the product storage 40a, 40b, 40c, has a CPU and a memory inside, and opens / closes the electromagnetic valve of the refrigerant circuit by setting the operation mode setting SW91. Take control.
When the operation mode is set to a mode (hereinafter referred to as the CCC mode) in which the product storage units 40a, 40b, and 40c are all cooled in such a configuration, the control means 90 is operated by the electromagnetic valves 68, 69, 70a, 70b, 70c, 73b, and 73c. Is opened and the solenoid valves 68b, 68c, 74 are closed. As shown in FIG. 5 (a), the high-temperature refrigerant compressed by the compressor 61 is condensed in the condenser 62 to become liquid refrigerant, expands by the expansion valve 63, and becomes a low-temperature gas-liquid two-phase flow. The product is divided into three directions and evaporated by the evaporators 65a, 65b, and 65c, and the product storage boxes 40a, 40b, and 40c are cooled. The refrigerant turned into gas is returned to the compressor 61 and operated until the refrigeration cycle reaches an appropriate temperature.
On the other hand, although the first electromagnetic valves 68b and 68c are closed, some high-temperature refrigerant may leak due to the discharge pressure of the compressor 61. This leaked refrigerant flows from the first electromagnetic valves 68b and 68c into the expansion valve 72 through the bypass circuits 75b and 75c via the second electromagnetic valves 73b and 73c. Since the leaked refrigerant that has flowed in has a low pressure on the outlet side of the expansion valve 72, it is expanded by the second expansion valve 72, flows into the evaporators 65a, 65b, and 65c from the flow divider 64 and evaporates to become a low-temperature gaseous refrigerant. . In this way, the leaked refrigerant is collected as a circulating refrigerant without staying in the heating heat exchangers 66b and 66c, so that the cooling capacity is maintained with high efficiency without reducing the refrigerant circulation amount of the circuit. .

Next, when the operation mode is set to a mode in which the product storage units 40a, 40b, 40c cool, cool, and heat (hereinafter referred to as CCH mode), the control means 90 sets the electromagnetic valves 68c, 69, 70a, 70b, 73b. The solenoid valves 68, 68b, 70c, 73c, and 74 are closed. As shown in FIG. 5 (b), the high-temperature refrigerant compressed by the compressor 61 flows into the heating heat exchanger 66c through the first electromagnetic valve 68c and is condensed to become liquid refrigerant, which heats the commodity storage 40c. To do. Next, the condensed refrigerant is further condensed by the condenser 62, expanded by the expansion valve 63 to become a low-temperature gas-liquid two-phase flow, divided into two by the flow divider 64, and evaporated by the evaporators 65a and 65b. Then, the product storage boxes 40a and 40b are cooled. The refrigerant turned into gas in the evaporators 65a and 65b returns to the compressor 61 and is operated until the refrigeration cycle reaches an appropriate temperature.
By the way, the refrigerant leaking from the closed first electromagnetic valve 68b flows into the second expansion valve 72 from the bypass circuit 75b via the second electromagnetic valve 73b as described above, and is expanded. Since the refrigerant flows into the evaporators 65a and 65b and is evaporated and collected, the cooling capacity is maintained with high efficiency without reducing the refrigerant circulation amount of the circuit.
Next, when the operation mode is set to a mode in which the product storage units 40a, 40b, and 40c cool, heat, and heat (hereinafter referred to as CHH mode), the control unit 90 opens the electromagnetic valves 68b, 68c, 70a, and 74. The electromagnetic valves 68, 69, 70b, 70c, 73b, 73c are closed. As shown in FIG. 5C, the high-temperature refrigerant compressed by the compressor 61 flows into the heating heat exchangers 66b and 66c via the first electromagnetic valves 68b and 68c and is condensed, and the product storage case 40b, Heat 40c. The condensed liquid refrigerant is expanded by the expansion valve 63 via the electromagnetic valve 74 and the bypass circuit 70 to become a low-temperature gas-liquid two-phase flow, and is evaporated by the evaporator 65a from the flow divider 64. To be cooled.

In the case of the CHH mode, since the first electromagnetic valves 68b and 68c are always opened, there is no problem that the cooling and heating performance is deteriorated due to leakage.
(Example 2)
A vending machine according to a second embodiment of the present invention will be described with reference to FIG. FIG. 6 is a refrigerant circuit diagram according to the second embodiment of the present invention, and shows the flow of the refrigerant in the operation mode CCC. The difference from the first embodiment is that, instead of the bypass pipes 75b and 75c and the second electromagnetic valves 73b and 73c, the bypass pipe 75 is connected to a pipe connected to the outlets of the heating heat exchangers 66b and 66c. 73 and a third expansion valve (expansion means) 72 and connected to the inlet portion of the distributor 64. An electromagnetic valve 79 is provided between the electromagnetic valve 68 and the bypass pipe 75 inlet. Other configurations are substantially the same as those of the first embodiment, and thus the description thereof is omitted. Note that a bypass pipe composed of the bypass pipe 75, the third electromagnetic valve 73, and the third expansion valve (expansion means) 72 constitutes a decompression pipe.
In such a configuration, when operating in the CCC operation mode, the control means 90 opens the electromagnetic valves 68, 69, 70a, 70b, 70c, 73, and closes the electromagnetic valves 68b, 68c, 74, 79. At this time, the refrigerant leaking from the electromagnetic valves 68b and 68c expands via the heating heat exchangers 66b and 66c from the bypass circuit 75 via the third electromagnetic valve 73 and the third expansion valve 72. Since it flows into the flow divider 64, the refrigerant circulation amount of the circuit is reduced, and the cooling capacity is not lowered.

(Example 3)
A vending machine according to Embodiment 3 of the present invention will be described. 7 shows a refrigerant circuit diagram according to the third embodiment of the present invention, FIG. 8 shows a refrigerant flow in the refrigerant circuit diagram of FIG. 7, and (a) shows a refrigerant flow in the operation mode CCC. It is a circuit diagram, (b) is a circuit diagram which shows the flow of the refrigerant | coolant of operation mode CCH, (c) is a circuit diagram which shows the flow of the refrigerant | coolant of operation mode CHH.
The difference from the first embodiment is that the storage pipe provided outside the product storage box is connected to the piping connecting the outlets of the heating heat exchangers 66b and 66c instead of the bypass pipes 75b and 75c and the second electromagnetic valves 73b and 73c. The refrigerant pipe 77a is connected through the external heat exchanger 76, and the refrigerant pipe 77b is connected to the inlet portion of the distributor 64 through the third expansion valve 72a. Further, the compressor 61 is provided with an accumulator 78 for separating the gas-liquid refrigerant in the inlet side pipe. Other configurations are substantially the same as those of the first embodiment, and thus the description thereof is omitted. In addition, the bypass line consisting of the external heat exchanger 76 and the third expansion valve 72a connected to the outlets of the heating heat exchangers 66b and 66c constitutes a pressure reducing line.
When the operation mode is set to the CCC mode with such a configuration, the control means 90 opens the electromagnetic valves 68, 70a, 70b, and 70c, and closes the electromagnetic valves 68b and 68c. As shown in FIG. 8A, the high-temperature refrigerant compressed by the compressor 61 is condensed in the condenser 62 to become liquid refrigerant, expands in the expansion valve 63 and becomes a low-temperature gas-liquid two-phase flow, and in the flow divider 64 The product is divided into three directions and evaporated by the evaporators 65a, 65b, and 65c, and the product storage boxes 40a, 40b, and 40c are cooled. The refrigerant that has become gas returns to the compressor 61 via the accumulator 78 and is operated until the refrigeration cycle reaches an appropriate temperature.

On the other hand, the refrigerant leaking from the closed first electromagnetic valves 68b and 68c enters the external heat exchanger 76 through the heating heat exchangers 66b and 66c and is condensed. The condensed leaked refrigerant is expanded by the third expansion valve 72a via the refrigerant pipe 77a, flows into the evaporators 65a, 65b, and 65c from the flow divider 64 and evaporates to become a low-temperature gaseous refrigerant. In this way, the leaked refrigerant is recovered as a circulating refrigerant without staying in the heating heat exchangers 66b and 66c and the external heat exchanger 76, so that the cooling capacity is reduced without reducing the refrigerant circulation amount of the circuit. Is maintained with high efficiency.
Next, when the operation mode is set to the CCH mode, the control unit 90 opens the electromagnetic valves 68c, 70a, and 70b, and closes the electromagnetic valves 68, 68b, and 70c. As shown in FIG. 8B, the high-temperature refrigerant compressed by the compressor 61 flows into the heating heat exchanger 66c and is condensed to heat the commodity storage 40c. The high-temperature refrigerant condensed by the heating heat exchanger 66c is further condensed by the external heat exchanger 76, and expanded by the third expansion valve 72a via the refrigerant pipe 77a. The refrigerant expanded by the third expansion valve 72a becomes a low-temperature gas-liquid two-phase flow, is divided by the flow divider 64 and is evaporated by the evaporators 65a and 65b, and the product storage boxes 40a and 40b are cooled. The refrigerant turned into gas in the evaporators 65a and 65b returns to the compressor 61 and is operated until the refrigeration cycle reaches an appropriate temperature.
By the way, the refrigerant leaking from the closed first electromagnetic valve 68b enters the external heat exchanger 76 through the heating heat exchanger 66b as described above, is condensed, and is then condensed by the third expansion valve 72a. Since the refrigerant is expanded and flows into the evaporators 65a and 65b to evaporate and is collected, the cooling capacity is maintained with high efficiency without reducing the refrigerant circulation amount of the circuit.

In the refrigeration cycle, the heat exchangers that condense are the heating heat exchanger 66c and the external heat exchanger 76, and the heat exchangers that evaporate are the evaporators 65a and 65b. As a result of operating with a large capacity, the cooling capacity is prevented from being lowered.
Next, when the operation mode is set to the CHH mode, the control unit 90 opens the electromagnetic valves 68b, 68c, 70a and closes the electromagnetic valves 68, 70b, 70c. As shown in FIG. 8C, the high-temperature refrigerant compressed by the compressor 61 flows into the heat exchangers 66b and 66c and is condensed to heat the product storage boxes 40b and 40c. The high-temperature refrigerant condensed by the heating heat exchangers 66b and 66c is further condensed by the external heat exchanger 76 and expanded by the third expansion valve 72a via the refrigerant pipe 77a. The refrigerant expanded by the third expansion valve 72a becomes a low-temperature gas-liquid two-phase flow, evaporates by the evaporator 65a via the flow divider 64, and the commodity storage 40a is cooled. The refrigerant turned into gas in the evaporator 65a returns to the compressor 61 and is operated until the refrigeration cycle reaches an appropriate temperature.
In the case of the CHH mode, since the first electromagnetic valves 68b and 68c are always opened, there is no problem that the cooling and heating performance is deteriorated due to leakage.
In the refrigeration cycle, the heat exchangers that condense are heating heat exchangers 66b and 66c and the external heat exchanger 76, and the heat exchanger that evaporates becomes the evaporator 65a. As a result of being operated in a state where the capacity is sufficiently large, the cooling capacity is prevented from being lowered.
Example 4
A vending machine according to a fourth embodiment of the present invention will be described. FIG. 9 shows a refrigerant circuit diagram according to the fourth embodiment of the present invention, FIG. 10 is a schematic diagram showing the piping configuration of the condenser, (a) is a plan view, and (b) is a front view. .

The difference from the third embodiment is that a condenser 82 in which the condenser pipe 82a and the external heat exchanger pipe 82b of the condenser 62 and the external heat exchanger 76 are integrally formed by a common cooling fin 82c is provided. is there. Further, in FIG. 7, the fan 62 f for the condenser 82 (the condenser 62 and the external heat exchanger 76) not shown, and the internal temperature sensors Ta, Tb, and Tc for detecting the internal temperature are illustrated. Yes. Since the other configuration is substantially the same as that of the third embodiment, the description thereof is omitted, and the operation in the operation mode is also substantially the same as that of the third embodiment, and thus the description thereof is omitted.
As shown in FIG. 10 (b), the condenser 82 has two independent pipes, one on the windward side as shown by the white arrow in FIG. 10 (a) and the wind flow of the fan 62f. It has a three-pitch external heat exchange pipe 82b and a condensing pipe 82a which is a pipe other than the pipe at the upper position, and these pipes are configured to be thermally coupled to a common radiating fin 82c. Accordingly, the external heat exchange pipe 82b disposed on the windward side can exchange heat more efficiently than the condensing pipe 82a. Further, as shown in the operation mode of FIG. 8, in the CCC mode that is the simultaneous cooling operation and the CCH mode and the CHH mode that are the simultaneous cooling and heating operation (also referred to as heat pump operation), the condenser 62 and the external heat exchanger 76 are connected. The refrigerant will not flow at the same time. Therefore, since the condenser 82 has the heat radiation fins 82c common to the external heat exchange pipe 82b and the condensation pipe 82a, the heat radiation efficiency of the refrigerant is improved corresponding to the area of the heat radiation fins 82c. .

The fan 62f is a so-called propeller fan, is driven by a DC motor, and is rotationally controlled by the internal temperature sensors Ta, Tb, Tc. That is, when the room to be heated is higher than the set temperature in the refrigerator, the cooling capacity of the refrigeration cycle is increased by rotating the fan 62f at full speed and increasing the heat radiation by the external heat exchange pipe 82b. When the heating chamber is lower than the internal set temperature, the fan 62f is decelerated or stopped to reduce or stop the heat radiation by the external heat exchange pipe 82b, and the heating capacity of the heating heat exchangers 66b and 66c. Increase. Specifically, when the heating operation chamber is higher than the internal set temperature and all the cooling operation chambers are higher than the internal set temperature, the fan 62f is operated at full speed. When the room for heating operation is higher than the set temperature in the chamber and only one room for cooling operation is lower than the set temperature in the chamber, the fan 62f is operated at medium speed or low speed, and the room for heating operation is set in the store temperature. If it is lower, the fan 62f is stopped.
In such a configuration, when the vending machine is operated, the condenser 82 can be used when the refrigerant flows through the condensation pipe 82a during the cooling only operation or when the refrigerant flows through the external heat exchange pipe 82b during the cooling heating simultaneous operation. Since the condensation heat is radiated by the common heat radiation fins 82c, the heat exchange is efficiently performed as compared with the case where the condenser 62 and the external heat exchanger 76 are provided separately.
Further, since the external heat exchange pipe 82b is disposed on the windward side of the condenser 82, it is not affected by the wake of the condenser pipe 82a, so that the performance of the cooling / heating operation is improved.
(Example 5)
A vending machine according to Embodiment 5 of the present invention will be described. FIG. 11 shows a refrigerant circuit diagram according to the fifth embodiment of the present invention, FIG. 12 shows a refrigerant flow in the refrigerant circuit diagram of FIG. 11, and (a) is when adjusting the circulation amount of the refrigerant. It is a circuit diagram which shows the flow of a refrigerant | coolant, (b) is a circuit diagram which shows the flow of a refrigerant | coolant when adjusting the circulation amount of another refrigerant | coolant.

The difference from the third embodiment is that the fourth electromagnetic valve 80 is provided on the outlet side of the condenser 62, and the fifth electromagnetic valve 81 is provided on the outlet side of the external heat exchanger 76. Other configurations are substantially the same as those of the third embodiment, and thus the description thereof is omitted. Further, since the operation in the operation mode is substantially the same as that of the third embodiment, the description thereof is omitted.
Here, adjustment of the refrigerant circulation amount suitable for the operation mode will be described. In the operation mode, reducing the refrigerant circulation rate in the order of the CCC mode, the CCH mode, and the CHH mode results in a cooling / heating operation with high efficiency. In order to reduce the amount of refrigerant circulation, the refrigerant may be retained in a heat exchanger that is not being used.
When the operation is performed in the CCC mode and the operation is switched to the CCH mode, the electromagnetic valve of the refrigerant circuit is set to reduce the refrigerant circulation amount as shown in FIG. Specifically, the control means 90 opens the electromagnetic valves 68c, 70a, 70b, 80, 81, and closes the electromagnetic valves 68, 68b, 70c. The refrigerant compressed by the compressor 61 is condensed by the heating heat exchanger 66c and the external heat exchanger 76, expanded by the third expansion valve 72a, evaporated by the evaporators 65a and 65b, and returned to the compressor 61. Cycle through the cycle. On the other hand, the refrigerant staying in the condenser 62 during operation in the CCC mode is sucked at a low pressure by the third expansion valve 72a and flows into the evaporators 65a and 65b through the expansion valve 63, so that the appropriate retention When the amount is reached, the refrigerant circulation amount can be reduced by closing the fourth electromagnetic valve 80.

FIG. 12B shows another embodiment. Specifically, the control means 90 opens the electromagnetic valves 68, 68c, 70a, 70b, 80 and closes the electromagnetic valves 68b, 70c, 81. To do. The refrigerant compressed by the compressor 61 is condensed by the condenser 62, expanded by the expansion valve 63, evaporated by the evaporators 65 a and 65 b, and circulated in the refrigeration cycle returning to the compressor 61. On the other hand, the refrigerant compressed by the compressor 61 is accumulated in the heating heat exchanger 66c and the external heat exchanger 76 via the expansion valve 68c, so that the refrigerant staying in the condenser 62 corresponding to that amount. As a result of the decrease, the amount of refrigerant circulation can be reduced by opening the fifth solenoid valve 81 and closing the solenoid valve 68 and the fourth solenoid valve 80 when the appropriate amount of residence is reached.
When the operation is switched from the CCH mode to the CCC mode and the refrigerant circulation amount is increased, the setting of the electronic valve in the CCC mode operation may be simply performed. The change to the CHH mode is the same.
As described above, by controlling the opening and closing of the fourth and fifth solenoid valves 80 and 81, the circulation amount of the refrigerant can be appropriately adjusted in each operation mode, so that the cooling / heating operation is performed with high efficiency. be able to.
(Example 6)
A vending machine according to a sixth embodiment of the present invention will be described with reference to FIGS. FIG. 13 shows a refrigerant circuit diagram according to Embodiment 6 of the present invention, and FIG. 14 shows a control block diagram of FIG. FIG. 15 is a flowchart showing control for adjusting the refrigerant circulation amount of the vending machine according to the sixth embodiment of the present invention, and FIG. 16 is an operation diagram of the electromagnetic valve and the electronic expansion valve in each operation condition. FIG. 17 is a circuit diagram showing the flow of the refrigerant at the time of the step of FIG. 15, (a) is a circuit diagram when the refrigerant is supplied to the heating heat exchanger, and (b) is a time when the refrigerant is recovered in the condenser. A circuit diagram is shown.

The difference from the fifth embodiment is that the fifth electromagnetic valve 81 on the outlet side of the external heat exchanger 76 is omitted and an electronic expansion valve 79 is used as the second expansion means 72a. 11, the fan 62f for the condenser 62 and the external heat exchanger 76, the internal temperature sensors Ta, Tb. Tc is illustrated. As shown in FIG. 14, an electronic expansion valve 79 is connected to the control means 90a. Further, since the operation in the operation mode during normal operation is substantially the same as that of the fifth embodiment, the description thereof is omitted.
In Example 6 of the present invention, in each operation mode, when the cooling and heating simultaneous operation is started, when the internal temperature of the chamber of 1 or 2 reaches a predetermined set temperature and the operation becomes the cooling alone, or On the contrary, when the cooling-only operation is switched to the cooling-heating simultaneous operation, the refrigerant that has fallen into the heating heat exchangers 65b and 65c during operation or when the operation time has elapsed, such as when the operation time has accumulated, has been circulated. This is related to operation control in order to properly adjust the refrigerant circulation amount.
The event in which this control is performed is shown in the operation diagram of FIG. The first column in FIG. 16 is a number (No.), the second column is an operation mode, the third column is an event, the fourth column is a control pattern, the fifth column and thereafter are solenoid valves 68, 68c, 68b, 70a, 70b, The operations of 70c and 80 and the electronic expansion valve 79 are shown. In FIG. 16, “◯” indicates opening of the solenoid valve, and “×” indicates closing. “☆ 1” indicates that the solenoid valve 80 is opened several tens of seconds to several minutes after closing, and “☆ 2” indicates that the electronic expansion valve 79 is fully opened several tens of seconds to several minutes after the predetermined opening degree. “★” indicates that the electronic expansion valve 79 has a predetermined opening degree corresponding to the internal temperature. In addition, in the modes with “☆ 1”, “☆ 2”, and “★”, the opening / closing operation is performed every predetermined time. And control by event is in the case of all-chamber cooling operation mode (CCC mode), at the start of operation (No1 in FIG. 16), in the case of cooling / heating operation mode (CCH mode, CHC mode, CHH mode). , When the operation is started (No. 3, 7, 11 in FIG. 16), when the cooling and heating simultaneous operation is changed to the single cooling operation (the heating chamber is at an appropriate temperature and only the cooling chamber is operated) (No. 4, 8, and 12 in FIG. 16). Or conversely, it is performed when the cooling single operation is changed to the simultaneous cooling and heating operation (Nos. 6, 10, and 14 in FIG. 16), and is also performed when a certain time (for example, 2 hours) has elapsed. When the operation is stopped, all the electromagnetic valves 68, 68c, 68b, 70a, 70b, 70c, 80 and the electronic expansion valve 79 are closed. In the control pattern, the case where the refrigerant is supplied to the heating heat exchangers 66b and 66c is indicated by 1, the case where the refrigerant is recovered to the condenser 62 is indicated by 2, and the case where the operation is stopped is indicated by 0.

This operation control will be described with reference to the flowchart of FIG. In this flowchart, steps S13 to 22 in the case of performing the cooling and heating simultaneous operation which is the control pattern 1 for supplying the refrigerant to the heating heat exchangers 66b and 66c, and the cooling alone which is the control pattern 2 for collecting the refrigerant in the condenser 62. The operation is divided into steps S33 to S42 when the operation is performed.
As an example, a case will be described in which the cooling single heating operation is changed to the cooling heating simultaneous operation in the CCH mode (No. 6 in FIG. 16). First, the internal temperature is read from the internal temperature sensors Ta, Tb, and Tc (S11), and the operation state of cooling and heating of each chamber is determined (S12). If it is during cooling / heating simultaneous operation or when switching to simultaneous cooling / heating operation (S13 / Yes), when the compressor 61 starts operation in the next step, or when switching from cooling single operation to simultaneous cooling / heating operation, or operation time It is determined whether or not a certain period of time has elapsed (S14). If this condition is not satisfied (S14 / No), the process returns to the first step S11. If this condition is satisfied (S14 / Yes), the following refrigerant adjustment is performed. First, the electronic expansion valve 79 on the outlet side of the external heat exchanger 76 is set to a predetermined opening degree (S15). Next, the first electromagnetic valve 68c on the inlet side of the heating heat exchanger 66c is opened (S17), and after a predetermined time (S18), the electromagnetic valve 68 on the inlet side of the condenser 62 is closed (S19). . At this time, as shown in FIG. 17A, the refrigerant is exchanged between the condenser 62 and the evaporators 65a, 65b and 65c by the compressor 61 through the first electromagnetic valve 68c and the heating heat exchanger 66c and the external heat exchange. Supplied to the vessel 76. Thereafter, the fourth solenoid valve 80 is closed and normal operation is performed (S21). In this way, since the refrigerant stored in the condenser 62 and the evaporators 65a, 65b, and 65c during the single cooling operation is supplied to the heating heat exchanger 66c side, an appropriate refrigerant circulation amount can be obtained, and cooling / Heating operation can be performed with high efficiency.

As described above, the control unit 90a is configured so that the heating heat exchanger 66b, During the single cooling operation, the first solenoid valves 68b and 68c on the outlet side of 66c are opened, and then the solenoid valve 68 on the inlet side of the condenser 62 is closed to control the refrigerant circulation amount. Since the refrigerant stored in the condenser 62 and the evaporators 65a, 65b, and 65c is supplied to the heating heat exchangers 66b and 66c, an appropriate refrigerant circulation amount can be obtained, and cooling and heating operations can be performed with high efficiency. be able to.
Next, description will be made by taking as an example the case of switching from the simultaneous cooling and heating operation to the single cooling operation in the CCH mode (No. 4 in FIG. 16). In the flowchart of FIG. 15, the process proceeds to steps S11 to S13. In step S13, the branch is No in this case, and thus the process proceeds to step S33. In this step, it is determined whether or not the compressor 61 starts operation, switches from simultaneous cooling and heating operation to single cooling operation, or when the operation time has accumulated a fixed time (S34). If this condition is not satisfied (S34 / No), the process returns to the first step (S11). If this condition is satisfied (S34 / Yes), the following refrigerant adjustment is performed. In the case of the explanation example, since the cooling and heating simultaneous operation is switched to the cooling single operation (S34 / Yes), first, the first electromagnetic valve 68 on the inlet side of the condenser 62 is opened (S35), and after a certain time has elapsed. (S36), the electromagnetic valve 68c on the inlet side of the heating heat exchanger 66c is closed (S37), and after a predetermined time has passed (S38), the fourth electromagnetic valve 80 on the outlet side of the condenser 62 is closed. (S39). After a predetermined time has elapsed (S40), the electronic expansion valve 79 on the outlet side of the external heat exchanger 76 is fully opened (S41). As a result, the outlet side of the condenser 62 is shut off as shown in FIG. 17B, and the refrigerant stored in the heating heat exchangers 66b and 66c and the external heat exchanger 76 is recovered by the condenser 62. The After the collection, the opening degree of the electronic expansion valve 79 is returned to a predetermined position, and a normal cooling operation is performed (S42). In this way, the heating heat exchanger 66c and the storage including the amount that the refrigerant leaked from the first electromagnetic valve 68b during the single cooling operation cannot be recovered through the electronic expansion valve 79 in the heating heat exchanger 66b. Since the refrigerant stored in the external heat exchanger 76 is supplied to the condenser 62, an appropriate refrigerant circulation amount can be obtained and the cooling operation can be performed with high efficiency.

As described above, the control unit 90a is configured to enter the inlet of the condenser 62 at the start of the single cooling operation, at the time of switching from the simultaneous heating / cooling operation to the single cooling operation, or after the fixed time operation during the single cooling operation. Side first solenoid valve 68 is opened, then the first solenoid valves 68b and 68c on the inlet side of the heating heat exchangers 66b and 66c are closed, the fourth solenoid valve 80 is closed, and the electron By fully opening the expansion valve 79 and controlling the amount of refrigerant circulation, the refrigerant that has fallen into stagnation during the single cooling operation is recovered and the refrigerant circulation amount necessary for the single cooling operation is ensured. Operation can be performed with high efficiency.
(Example 7)
A vending machine according to Embodiment 7 of the present invention will be described with reference to FIGS. FIG. 18 shows a refrigerant circuit diagram according to Embodiment 7 of the present invention, and FIG. 19 shows a control block diagram. FIG. 20 is a flowchart for adjusting the refrigerant circulation amount when the operation mode is switched.
In the seventh embodiment, the refrigerant circulation amount is controlled by the condensing temperature. The difference from the fifth embodiment is that the first temperature sensor 84 for detecting the condensing temperature is provided on the outlet side of the heating heat exchangers 66c and 66b. The second temperature sensor 85 for detecting the condensation temperature is provided on the outlet side of the condenser 62. Moreover, the fan 62f for the condenser 62 and the external heat exchanger 76, and the internal temperature sensors Ta, Tb, and Tc, which are not shown in FIG. 11, are illustrated. As shown in FIG. 19, a first temperature sensor 84 and a second temperature sensor 85 are connected to the control means 90b. Further, since the operation in the operation mode is substantially the same as that of the fifth embodiment, the description thereof is omitted.

With this configuration, referring to the flowchart of FIG. 20, the control operation when switching from the three-chamber cooling operation mode (CCC operation mode) to the cooling / heating operation mode (HCC, CHC, HHC operation mode) is taken as an example in the HHC operation mode. It will be explained at the time of switching.
First, the first electromagnetic valves 68b and 68c on the heating heat exchangers 66b and 66c side are opened, the electromagnetic valve 68 is closed (S51), the inside temperature sensors Ta, Tb and Tc, and the first temperature sensor 84. Then, temperature data is read from the second temperature sensor 85 (S52). The controller 90b adjusts the electronic expansion valve 72a and the fan 62f based on the temperature data (S53). If the condensation temperature detected by the first temperature sensor 84 is equal to or higher than an abnormality determination value (for example, 80 ° C.) (S54 / Yes), the fourth solenoid valve 80 on the outlet side of the condenser 62 is closed (S55). ) After a predetermined time (for example, 1 minute), the solenoid valve 68 is opened for a predetermined time (for example, 2 minutes) (S56). By this operation, the refrigerant circulating through the heating heat exchangers 66b and 66c is recovered by the condenser 62, and the refrigerant circulation amount is reduced. And the inside temperature sensor Ta. If the temperature detected by Tb and Tc satisfies a target value (for example, -2 to 8 ° C for cooling and 50 to 65 ° C for heating) (S57 / Yes), the operation of the compressor 61 is stopped (S58). . The inside temperature sensor Ta. If the temperatures detected by Tb and Tc do not satisfy the target values (S57 / No), the process returns to step S53 for adjusting the electronic expansion valve 72a and the fan 62f. If the condensation temperature is equal to or lower than the abnormality determination value in step S54 (S54 / No), the inside temperature sensor Ta. The electronic expansion valve 72a and the fan 62f are adjusted and the refrigerant staying in the condenser 62 is adjusted until the temperatures detected by Tb and Tc satisfy the target values (S57).

As described above, the first temperature sensor 84 (condensation temperature detection means) for detecting the condensation temperature of the heating heat exchangers 66b and 66c is provided, and the control means 90b performs the first operation according to the condensation temperature detected by the condensation temperature detection means. Since the refrigerant circulation amount is gradually controlled by opening and closing the electromagnetic valve 80, an appropriate refrigerant circulation amount can be obtained, and cooling and heating operations can be performed with high efficiency.
(Example 8)
The vending machine according to the eighth embodiment of the present invention relates to control for finely adjusting the circulation amount of the refrigerant by the condensation temperature after the cooling and heating simultaneous operation (heat pump operation), and will be described with reference to the flowchart of FIG. . FIG. 21 is a flowchart for finely adjusting the refrigerant circulation amount during operation, and the refrigerant circuit diagram and the control block diagram are substantially the same as those in the seventh embodiment, and thus the description thereof is omitted. As an example, a case where the vehicle is operating in the HHC operation mode will be described.
First, the first electromagnetic valves 68b and 68c on the heating heat exchangers 66b and 66c side are opened, the electromagnetic valve 68 is closed (S61), and the inside temperature sensor Ta. Temperature data is read from Tb, Tc, the first temperature sensor 84, and the second temperature sensor 85 (S62). The control means 90b adjusts the electronic expansion valve 72a and the fan 62f based on the temperature data (S63). If the condensation temperature detected by the first temperature sensor 84 is other than the lower limit value T1 and the upper limit value T2 (S64 / No), it is first determined whether the condensation temperature is the upper limit value T2 (S65), and the condensation temperature is the upper limit value. If it is equal to or greater than the value T2 (S65 / Yes), the fourth solenoid valve 80 located on the outlet side of the condenser 62 is closed (S66), and the time on the inlet side of the condenser 62 is less than the previous operation time. The first electromagnetic valve 68 is opened (S67). By this operation, the refrigerant circulating through the heating heat exchangers 66b and 66c is recovered by the condenser 62, the refrigerant circulation amount is reduced, and it can be finely adjusted to an appropriate refrigerant circulation amount. And the inside temperature sensor Ta. If the temperature detected by Tb and Tc satisfies a target value (for example, -2 to 8 ° C for cooling, 50 to 65 ° C for heating) (S68 / Yes), the operation of the compressor 61 is stopped (S71). . The inside temperature sensor Ta. If the temperatures detected by Tb and Tc do not satisfy the target values (S68 / No), the process returns to step S63 for preparing the electronic expansion valve 72a and the fan 62f.

If the condensation temperature is not higher than the upper limit value T2 in step S65 (S65 / No), the process proceeds to step S69 to determine whether the condensation temperature is lower than the lower limit value T1, and if the condensation temperature is not lower than the lower limit value T1 ( (S69 / No), the process proceeds to step S68, and if the condensing temperature is equal to or lower than the lower limit value T1 (S69 / Yes), the fourth solenoid valve 80 on the outlet side of the condenser 62 is opened for a certain time (S70). By this operation, the refrigerant stored in the condenser 62 is supplied to the heating heat exchangers 66b and 66c, so that the refrigerant circulation amount is increased and fine adjustment can be made to an appropriate refrigerant circulation amount.
If the condensation temperature detected by the first temperature sensor 84 in step S64 is between the lower limit value T1 and the upper limit value T2 (S64 / Yes), the process proceeds to step S68 without adjusting the refrigerant circulation amount. Internal temperature sensor Ta. The above-described control is continued until the temperatures detected by Tb and Tc satisfy the target value.
As described above, when the condensing temperature detected by the condensing temperature detecting means is higher than the predetermined temperature, the control means 90b closes the fourth electromagnetic valve 80 and performs the condenser 62 in a time shorter than the previous operation time. The refrigerant circulation amount is controlled by opening the solenoid valve 68 on the inlet side of the refrigerant. Further, when the condensing temperature detected by the condensing temperature detecting means is lower than the predetermined temperature, the control means 90b controls the fourth electromagnetic valve 80 to be slightly increased by opening the fourth electromagnetic valve 80 for a predetermined time. . Thus, even after the operation mode is switched, the refrigerant circulation amount can be finely adjusted, and the cooling / heating operation can be performed with high efficiency.

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

It is a perspective view which shows the vending machine which concerns on Example 1 of this invention. It is sectional drawing of the vending machine shown in FIG. It is a refrigerant circuit figure concerning Example 1 of the present invention. It is a block diagram of a control apparatus. 3 shows a refrigerant flow in the refrigerant circuit diagram of FIG. 3, (a) is a circuit diagram showing a refrigerant flow in the operation mode CCC, (b) is a circuit diagram showing a refrigerant flow in the operation mode CCH, c) is a circuit diagram showing the flow of refrigerant in the operation mode CHH. It is a refrigerant circuit figure concerning Example 2 of the present invention. It is a refrigerant circuit figure concerning Example 3 of the present invention. FIG. 7 shows the refrigerant flow in the refrigerant circuit diagram of FIG. 7, (a) is a circuit diagram showing the refrigerant flow in the operation mode CCC, (b) is a circuit diagram showing the refrigerant flow in the operation mode CCH, c) is a circuit diagram showing the flow of refrigerant in the operation mode CHH. It is a refrigerant circuit figure concerning Example 4 of the present invention. It is a schematic diagram which shows the piping structure of a condenser, (a) is a top view, (b) is a front view. It is a refrigerant circuit figure concerning Example 5 of the present invention. FIG. 11 shows the flow of refrigerant in the refrigerant circuit diagram of FIG. 11, (a) is a circuit diagram showing the flow of refrigerant when adjusting the circulation amount of refrigerant, and (b) is when adjusting the circulation amount of another refrigerant. It is a circuit diagram which shows the flow of the refrigerant | coolant. It is a refrigerant circuit figure concerning Example 6 of the present invention. FIG. 14 is a control block diagram of FIG. 13. It is a flowchart which shows the control which adjusts the refrigerant | coolant circulation amount of the vending machine which concerns on Example 6 of this invention. It is an operation diagram of a solenoid valve and an electronic expansion valve under each operating condition. It is a circuit diagram which shows the flow of the refrigerant | coolant at the time of the step of FIG. 15, (a) is a circuit diagram when supplying a refrigerant | coolant to a heating heat exchanger, (b) is a circuit diagram when collect | recovering refrigerant | coolants to a condenser. . It is a refrigerant circuit figure concerning Example 7 of the present invention. It is a control block diagram concerning Example 7 of the present invention. It is a flowchart which adjusts the refrigerant | coolant circulation amount at the time of operation mode switching. 3 is a flowchart for finely adjusting a refrigerant circulation amount during operation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Main body cabinet 20 Outer door 30 Inner door 40a, 40b, 40c Product storage 60 Cooling / heating unit 61 Compressor 62 Condenser 63 Expansion valve (expansion means)
65a, 65b, 65c Evaporator 68b, 68c 1st solenoid valve 72 2nd expansion valve 72a 3rd expansion valve 73 3rd solenoid valve 73b, 73c 2nd solenoid valve 80 4th solenoid valve 81 5th Solenoid valve 83 Electronic expansion valve 84 First temperature sensor (condensation temperature detection means)
85 Second temperature sensor 90 Controller 91 Operation mode selection SW

Claims (12)

A vending machine having a plurality of product storages for cooling or heating the product storages according to the operation mode,
A compressor that compresses the refrigerant; a condenser that is provided outside the refrigerator to condense the refrigerant; an expansion means that expands the refrigerant; a distributor that distributes the refrigerant expanded by the expansion means; The refrigeration cycle with the evaporator of
A heating heat exchanger connected between the inlet of the compressor and the inlet of the condenser and provided in the warehouse to condense the refrigerant, and a first electromagnetic wave between the compressor and the heating heat exchanger A vending machine having a valve,
A vending machine comprising a pressure reducing pipe connecting the heating heat exchanger and the expansion means outlet side pipe via a second expansion means.   The vending machine according to claim 1, wherein the decompression pipe is a bypass pipe in which an inlet side of the heating heat exchanger and an outlet side of the expansion means are connected via a second electromagnetic valve. Machine.   The said pressure-reduction pipe line is a bypass pipe line connected between the said heating heat exchanger outlet side pipe line and the said expansion means outlet side via the 3rd solenoid valve. Vending machine. An external heat exchanger is installed outside the product storage,
The said decompression pipe line is a pipe line connected between the heating heat exchanger outlet side pipe line and the expansion means outlet side via the outside heat exchanger. Vending machine.   The vending machine according to claim 4, wherein the external heat exchanger has a structure integrated with the condenser.   The vending machine according to claim 5, wherein the external heat exchanger is disposed on the windward side of the condenser.   The fourth and / or fifth solenoid valve and control means for controlling opening and closing of the solenoid valve are provided downstream of the condenser and the external heat exchanger, and the control means includes the fourth and / or the fourth solenoid valve. The vending machine according to claim 4, wherein the refrigerant circulation amount is controlled by opening and closing the electromagnetic valve. The second expansion means is an electronic expansion valve;
The control means opens the electronic expansion valve at a predetermined opening degree at the start of the simultaneous heating / cooling operation, at the time of switching from the single cooling operation to the simultaneous heating / cooling operation, or after a fixed time operation during the heating / cooling simultaneous operation. The refrigerant circulation amount is controlled by opening the first electromagnetic valve on the inlet side of the heating heat exchanger, and then closing the electromagnetic valve on the condenser inlet. Item 7. A vending machine according to item 7. The second expansion means is an electronic expansion valve;
The control means opens the solenoid valve on the inlet side of the condenser at the start of the single cooling operation, at the time of switching from the simultaneous heating / cooling operation to the single cooling operation, or after a certain time operation during the single cooling operation. Then, the first solenoid valve on the inlet side of the heating heat exchanger is closed, the fourth solenoid valve is closed, and the electronic expansion valve is fully opened to control the refrigerant circulation amount. The vending machine according to claim 7. Condensation temperature detection means for detecting the condensation temperature of the heating heat exchanger is provided,
8. The automatic sales according to claim 7, wherein the control means controls the refrigerant circulation amount by opening and closing the fourth and / or fifth electromagnetic valve according to the condensation temperature detected by the condensation temperature detection means. Machine.   When the condensing temperature detected by the condensing temperature detecting means is higher than a predetermined temperature, the control means closes the fourth solenoid valve and closes the condenser inlet side in a time shorter than the previous operation time. The vending machine according to claim 10, wherein the refrigerant circulation amount is controlled by opening an electromagnetic valve. The control means controls the refrigerant circulation amount by opening the fourth electromagnetic valve for a predetermined time when the condensing temperature detected by the condensing temperature detecting means is lower than a predetermined temperature. The vending machine according to claim 10.

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