CN102479406A - Automatic vending machine - Google Patents

Abstract

Provided is an automatic vending machine that switches a plurality of operating modes and carries out cooling/heating on several warehouses inside. The warehouse comprises an in-house condenser (46) and a second evaporator (47). An out-house condenser (40) and an out-house evaporator (41) are arranged outside the warehouse. Moreover, a solenoid valve (50) is arranged upon a bypass pipe (54) connecting the in-house condenser (46) and a low-pressure side pipe. By respectively arranging a condenser and an evaporator both inside and outside the warehouse, the solenoid valve upon the outlet piping of the evaporator can be removed. Moreover, the efficiency drop resulting from pressure loss can be avoided. Also, the detained refrigerant, when the in-house condenser is out of use, can be recycled. The decrease of the cooling capacity can be prevented.

Description

vending machine

technical field

The present invention relates to an automatic vending machine that heats or cools products such as canned drinks and sells them, and relates to an automatic vending machine that includes a cooling system that cools the products using a refrigeration cycle.

Background technique

In recent years, the demand for reducing power consumption of vending machines has been increasing. As a means of reducing power consumption, automatic vending machines that use the waste heat generated by cooling or the heat of the outside air to heat the storage for storing products have been proposed. Freighter (for example, refer to Patent Document 1).

Hereinafter, a conventional automatic vending machine will be described with reference to the drawings.

FIG. 5 shows a refrigerant circuit diagram in a conventional automatic vending machine, and FIG. 6 shows a control flowchart at the time of operation mode switching.

A conventional automatic vending machine has: a product storage 1 for storing products; and a machine room (not shown) arranged under the product storage 1 . Commodity storage 1 is divided into three parts, with: the first cooling and warming room 2 for cooling or heating the stored goods; the second cooling and heating room 3 for cooling or warming the stored goods; The cooling-dedicated room 4 is the first product storage for cooling the products. In addition, in each storehouse, a product storage rack (not shown) is suspended from the upper part, and products are stored in the storage rack.

In addition, a conventional vending machine has: a compressor 5; an external heat exchanger 6; an expansion valve 7 for depressurizing the passing refrigerant; internal heat exchangers 8 and 9; an evaporator 10; Solenoid valves 11-19 for opening and closing valves; check valves 20-25 for allowing refrigerant to pass only in the direction of the arrow; external fans 26 installed near the external heat exchanger 6; Fans 27-29 in the storehouse near the heat exchanger; and warming heaters 30,31.

The operation of the conventional automatic vending machine installed as described above will be described with reference to FIG. 6 . In addition, the case where only the 1st cooling and heating room 2 is heated, and the other two rooms are cooled is demonstrated.

Conventional vending machines switch between the cooling and heating operation mode in which the first cooling and heating chamber 2 is heated and the second cooling and heating chamber 3 and the cooling dedicated chamber 4 are cooled by opening and closing the solenoid valves 11 to 19 (Three-chamber operation: C-C-H, two-chamber operation: C-H) and the heating operation mode (one-chamber operation: H) where only the first cooling and heating room 2 is heated, and only the second cooling and heating room 3 and the cooling dedicated room 4 cooling cooling operation mode (two chamber operation: C-C, one chamber operation: C) (C means cooling, H means heating).

Here, in FIG. 6 , a priority room is provided in each commodity storage, and the switching operation mode is controlled based on the heating ON/OFF temperature and the temperature state of the priority room/non-priority room. This makes it possible to always perform the operation in the optimum operation mode regardless of the cooling load/heating load, and contribute to energy saving.

[Patent Document 1] Japanese Patent Laid-Open No. 2006-11604

However, in the above-mentioned conventional structure, since both the internal heat exchanger and the external heat exchanger have become the specifications that a single heat exchanger is used to replace the function of the condenser or evaporator, it is necessary to branch the outlet of the heat exchanger into a The piping connected to the valve and the piping connected to the suction piping of the compressor must be provided with a solenoid valve for opening and closing on the piping connected to the suction piping of the compressor. When each heat exchanger functions as an evaporator, the solenoid valve is opened, but the interior of the solenoid valve is usually narrower than the surrounding piping, and a pressure loss occurs when the refrigerant passes through, which causes a decrease in compressor efficiency. In addition, if the inside of the solenoid valve is enlarged, the force of the coil when opening and closing needs to be strengthened, and this increases the power consumption when the coil is energized.

In addition, the optimum specifications for the condenser and the evaporator are different. When the heat exchanger becomes the optimum specification for the condenser, when it is used as the evaporator, there may be concerns about the insufficient capacity of the heat exchanger. Refrigerant backflow, and when it becomes the optimum specification as an evaporator, when it is used as a condenser, the condensing temperature does not reach the target temperature, the heating capacity decreases, and the optimum specification corresponding to each operation cannot be performed. down the running problem.

Contents of the invention

The present invention is made to solve the above-mentioned conventional problems, and an object of the present invention is to implement highly efficient operation and reduce power consumption in a system that performs cooling and heating by switching between various operation modes.

In order to solve the above-mentioned conventional problems, the automatic vending machine of the present invention has a plurality of commodity storages, and is characterized in that the automatic vending machine has: a first evaporator, which is installed in the first commodity storage as one of the above-mentioned commodity storages. In the storage; the second evaporator and the condenser in the storage, which are installed in the second product storage which is another of the above-mentioned product storage; compressor, external condenser, external evaporator, flow path switching A unit and an expansion mechanism are installed outside the commodity storage; a bypass pipe connects the condenser in the warehouse and a low-pressure side pipe; and an on-off valve opens and closes the bypass pipe.

Thereby, since it is not necessary to switch the heat exchanger provided in the 2nd product storage to a condenser/evaporator, efficiency can be improved by abolishing the electromagnetic valve provided in the low pressure side piping. In addition, according to the operation mode, the unused internal condenser and the low-pressure side piping can be connected with a bypass pipe, and by installing an on-off valve on the bypass pipe, the retained refrigerant can be recovered when not in use, Cooling capability can be ensured.

In the automatic vending machine of the present invention, a condenser and an evaporator are respectively installed inside and outside the product storage, and a bypass pipe is used to connect the condenser in the storage and the low-pressure side piping, and an on-off valve for opening and closing the bypass pipe is provided. , can abolish the solenoid valve on the low-pressure side piping. Thereby, cooling efficiency and heating efficiency can be improved, and cooling capacity shortage can be prevented by preventing refrigerant stagnation when the interior condenser is not used.

A first invention provides an automatic vending machine having a plurality of commodity storages, wherein the automatic vending machine includes: a first evaporator installed in the first commodity storage as one of the commodity storages; a second evaporator and a condenser in the warehouse, which are installed in the second product storage warehouse as another product storage warehouse in the above-mentioned product storage warehouse; a compressor, a condenser outside the warehouse, an evaporator outside the warehouse, a flow path switching unit, and an expansion mechanism Installed outside the above-mentioned product storage; a bypass pipe connecting the condenser in the above-mentioned warehouse and low-pressure side piping; and an on-off valve that opens and closes the above-mentioned bypass pipe, and the above-mentioned automatic vending machine realizes the improvement of the efficiency of the compressor. . In addition, by recovering the refrigerant from the condenser in the refrigerator, it is possible to prevent a decrease in cooling capacity.

The second invention is that in the first invention, when the refrigerant does not flow to the above-mentioned refrigerator condenser, the above-mentioned on-off valve is opened, and by recovering the stagnant refrigerant when the above-mentioned refrigerator condenser is not used, a decrease in cooling capacity can be prevented. .

The third invention is that in the first or second invention, during the stop of the compressor, the on-off valve is opened for a predetermined time and then the on-off valve is closed to store excess refrigerant to prevent backflow. The reliability of the compressor is reduced.

According to a fourth invention, in any one of the first to third inventions, when the temperature inside the second commodity storage is higher than a predetermined temperature, the on-off valve is always opened, thereby reducing the need for a large freezer. The initial pull down of the capacity or the pull down time when switching from warming to cooling.

Description of drawings

Fig. 1 is a refrigerant circuit diagram of an automatic vending machine according to Embodiment 1 of the present invention.

Fig. 2 is a refrigerant circuit diagram during cooling operation of the automatic vending machine according to the embodiment.

Fig. 3 is a refrigerant circuit diagram during the cooling and heating operation of the automatic vending machine according to the embodiment.

Fig. 4 is a refrigerant circuit diagram during a warming operation of the automatic vending machine according to the embodiment.

Fig. 5 is a refrigerant circuit diagram of a conventional automatic vending machine.

Fig. 6 is a flowchart of operation switching control of a conventional automatic vending machine.

Label description:

2: The first cooling and heating room (the second product storage room)

3: The second cooling and heating room

4: Cooling room (1st commodity storage)

5: Compressor 40: External condenser

41: Evaporator outside the library 46: Condenser inside the library

47: Evaporator in the warehouse (the second evaporator)

48: Resistor 49: Four-way switching valve

50: Solenoid valve (opening and closing valve) 51, 52: Solenoid valve

54: Bypass pipe

Detailed ways

Hereinafter, embodiments of the present invention will be described with reference to the drawings, and the same reference numerals will be assigned to the same structures as conventional ones for description. In addition, this invention is not limited to this embodiment.

(Embodiment 1)

1 is a refrigerant circuit diagram of an automatic vending machine according to Embodiment 1 of the present invention, FIG. 2 is a refrigerant circuit diagram of the automatic vending machine in this embodiment during cooling operation, and FIG. 3 is a diagram of the automatic vending machine in this embodiment. Fig. 4 is a refrigerant circuit diagram during the heating operation of the automatic vending machine according to the embodiment.

In FIG. 1 , the automatic vending machine according to Embodiment 1 includes: a product storage 1 for storing products; and a machine room (not shown) arranged at the lower part of the product storage 1 . The product storage 1 is divided into three parts, and has: a first cooling and warming room 2 as a second product storage for cooling or warming stored products; and a second cooling room 2 for cooling or warming stored products. A warming room 3; a cooling-only room 4 serving as a first product storage for cooling stored products. In addition, in each storehouse, a product storage rack (not shown) is suspended from the upper part, and products are stored in the storage rack.

In addition, this automatic vending machine has: a compressor 5; an external condenser 40; an external evaporator 41; a four-way valve 42 for switching the flow path of the refrigerant; and resistors 43 and 44 for reducing the pressure of the passing refrigerant. , 45,48,53; Be located at the condenser 46 in the storehouse of cooling and warming room 2; device); the four-way switching valve 49 capable of switching the flow path of the refrigerant; the bypass pipe 54; the solenoid valve 50 as an on-off valve capable of opening and closing the bypass pipe; other solenoid valves 51, 52; The electric heater 30,31 that uses; Outside condenser 40; Be located at the fan 26 outside the store near evaporator 41 outside storehouse;

Here, the interior condenser 46 and the second evaporator 47 are formed as an integrated heat exchanger sharing fins.

Furthermore, the external condenser 40 and the external evaporator 41 are also formed as an integrated heat exchanger sharing fins, and the piping of the external condenser 40 is formed at a position on the windward side when the external fan 26 operates.

Here, the four-way switching valve 49 is connected to the discharge pipe of the compressor 5 and the integrated heat exchanger of the internal condenser 46 , the external condenser 40 , and the external evaporator 41 .

And the pipes are connected so that the outlet of the internal evaporator 9 and the inlet of the internal evaporator 10 are arranged in series.

In addition, the resistor 48 is installed on the piping between the interior condenser 46 and the exterior condenser 40, and is set so that there is a difference between the interior condensation temperature and the exterior condensation temperature.

In addition, a solenoid valve 50 as an on-off valve is provided on a bypass pipe 54 connecting the internal condenser 46 and the low-pressure side piping leading to the compressor 5 .

Hereinafter, the operation of the automatic vending machine in Embodiment 1 of the present invention configured as described above will be described.

First, in the case of the cooling operation for cooling the entire room, the operation shown in FIG. 2 is performed.

In the case of cooling operation, the four-way switching valve 49 is operated to communicate the discharge pipe of the compressor 5 with the external condenser 40, and connect the inlet and outlet of the internal condenser 46, open the electromagnetic valve 51, and close the electromagnetic valve. 52, and start compressor 5.

The refrigerant discharged from the compressor 5 passes through the four-way switching valve 49 and the solenoid valve 51, and after being condensed in the external condenser 40, after being decompressed by the resistors 43, 44, and 45 through the four-way valve 42, it evaporates in the second The storage is cooled by evaporation and gasification in the container 47, and then returned to the compressor 5.

Next, in the cooling and heating operation of heating the first cooling and heating chamber 2 and cooling the second cooling and heating chamber 3 and the cooling dedicated chamber 4, the operation is as shown in FIG. 3 .

In the case of cooling and heating operation, the four-way switching valve 49 is operated so that the discharge pipe of the compressor 5 communicates with the inlet of the internal condenser 46, and the outlet of the internal condenser 46 communicates with the external condenser 40. , and open the solenoid valve 51, close the solenoid valve 52, and start the compressor 5.

The refrigerant discharged from the compressor 5 flows to the interior condenser 46 after passing through the four-way switching valve 49, and is partially condensed by the interior condenser 46. At this time, the interior of the refrigerator is heated by radiating heat to the surrounding air. After being decompressed by the resistor 48, the refrigerant coming out of the internal condenser 46 passes through the four-way switching valve 49 and the solenoid valve 51, and is further condensed by the external condenser 40, and then passed through the four-way valve 42 by the resistor. 44, 45 After the decompression, the evaporators 9, 10 in the store are evaporated and vaporized, thereby cooling the surrounding air. The vaporized refrigerant returns to the compressor 5 .

Next, in the case of the heating operation in which only the first cooling and heating chamber 2 is heated, the operation shown in FIG. 4 is performed.

In the case of heating operation, the four-way switching valve 49 is operated so that the discharge pipe of the compressor 5 communicates with the inlet of the internal condenser 46, and the outlet of the internal condenser 46 communicates with the external evaporator 41, Then, the solenoid valve 51 is closed, and the solenoid valve 52 is opened to start the compressor 5 .

After passing through the four-way switching valve 49, the refrigerant discharged from the compressor 5 passes through the condenser 46 in the storehouse to condense and dissipate heat to heat the inside of the storeroom. Valve 52 , and after further decompression by resistor 53 , evaporate and vaporize in external evaporator 41 , and return to compressor 5 .

As described above, when heating the first cooling and heating chamber 2, by opening and closing the solenoid valve 51 and the solenoid valve 52, it is possible to The first cooling and heating room 2 is heated, and the power consumption can be reduced by performing the heating operation at low outside air temperature when the load on the cooling room is lowered.

Furthermore, by providing the resistor 48 in the piping between the interior condenser 46 and the exterior condenser 40, a difference can be made between the interior condensation temperature and the exterior condensation temperature. Accordingly, since the density of the refrigerant is lowered, the amount of refrigerant can be reduced. By reducing the amount of refrigerant, it is possible to reduce the difference in the optimal amount of refrigerant between the cooling and heating operation using two condensers and the cooling operation using one condenser, and also reduce the risk of flammable refrigerants. Risk in case of spillage.

In addition, a capillary tube can be used for the resistor 48, and the capillary tube can also be used as a pipe connecting the resistor 48, the internal condenser 46, and the four-way switching valve 49 by using the capillary tube, so that the amount of refrigerant can be further reduced.

In addition, by arranging the condenser and the evaporator separately inside and outside the store, compared with the case where each heat exchanger is used separately as a condenser and an evaporator, it is possible to eliminate the need to connect the evaporator outlet and the compressor. The solenoid valve installed on the piping of the suction piping can prevent the drop in efficiency due to pressure loss. In addition, since the condenser and the evaporator can be individually optimized, it is possible to operate more efficiently.

In addition, during the cooling operation in which the refrigerant does not pass through the interior condenser 46, if the refrigerant leaks through the four-way switching valve 49, the refrigerant and/or refrigerating machine oil may remain in the interior condenser 46, resulting in Insufficient cooling capacity and/or failure of the compressor, etc. are caused, but since the solenoid valve 50 is provided on the bypass pipe 54 connecting the condenser 46 in the storehouse and the low-pressure side piping connected to the compressor 5, the valve is opened The solenoid valve 50 can recover the refrigerant and/or oil remaining in the condenser 46 in the refrigerator to the suction pipe of the compressor 5, and can prevent insufficient cooling capacity and/or failure of the compressor.

Here, by opening the solenoid valve 50 for a predetermined time and then closing it in a state where the compressor 5 is stopped and the high and low pressures are balanced, the refrigerant is stored in the condenser 46 in the refrigerator under a state of balanced pressure. Cooling operation is performed with a small amount of refrigerant, and on the other hand, in a state of high load such as lowering or switching from a heating setting to a cooling setting, the electromagnetic valve 50 is always opened, and the entire refrigerant can be utilized. By changing the amount of circulating refrigerant according to the capacity for cooling or the like, it is possible to simultaneously prevent backflow caused by too much refrigerant during stable operation and improve capacity during overload.

In addition, since the leakage of refrigerant in the four-way switching valve 49 is very small, the same effect can be obtained even if the electromagnetic valve 50 is not always opened but is periodically opened for a predetermined time during the startup of the compressor. Accordingly, the power consumption of the solenoid valve can be kept to a minimum.

Here, the stagnant refrigerant is recovered by connecting the suction pipe of the condenser 46 in the storehouse and the compressor 5, but any place is acceptable as long as the connected pipe is a low-pressure part, specifically, as long as the resistance After the devices 43, 44, 45, 53 get final product. However, since the piping becomes long when connecting in the product storage, it is most possible to shorten the piping length by connecting to the suction piping of the compressor 5 .

As described above, the automatic vending machine of the present invention can improve the efficiency by eliminating the solenoid valve on the low-pressure side piping in the refrigeration cycle in which multiple operation modes are switched to cool and warm the interior of the refrigerator, and recover the stagnant Since the refrigerant in the condenser is used, it can also be applied to cooling and heating equipment for cooling or heating a plurality of storage rooms.

Claims (6)

1. automatic vending machine, it has a plurality of commodities storehouse, it is characterized in that,

Said automatic vending machine has:

The 1st evaporator, it is arranged on as in one in the said commodity storehouse the 1st commodity storehouse;

The 2nd evaporator and storehouse inner condenser, they are arranged on as in another the 2nd commodity storehouse in the said commodity storehouse;

Evaporator, stream switch unit and expansion mechanism outside compressor, storehouse external condenser, the storehouse, they are arranged on the outside in said commodity storehouse;

Shunt valve, it connects said storehouse inner condenser and low-pressure side pipe arrangement; And

Open and close valve, it opens and closes said shunt valve.

2. automatic vending machine according to claim 1 is characterized in that,

When cold-producing medium does not flow to said storehouse inner condenser, open said open and close valve.

3. automatic vending machine according to claim 1 and 2 is characterized in that,

In the stopping of said compressor, make said open and close valve after the open stipulated time, inaccessible said open and close valve.

4. automatic vending machine according to claim 1 is characterized in that,

Storehouse temperature in said the 2nd commodity storehouse is higher than under the situation of set point of temperature, open all the time said open and close valve.

5. automatic vending machine according to claim 2 is characterized in that,

Storehouse temperature in said the 2nd commodity storehouse is higher than under the situation of set point of temperature, open all the time said open and close valve.

6. automatic vending machine according to claim 3 is characterized in that,

Storehouse temperature in said the 2nd commodity storehouse is higher than under the situation of set point of temperature, open all the time said open and close valve.

Images