JPS6367117B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to an improvement in a storage cabinet that can switch between cold and hot operation, which switches between cooling and warming articles.

Configuration of conventional example and its problems Vending machines are generally known as this type of storage with cold/hot operation switching, so this conventional vending machine is shown in Figures 3 and 4 as a reference. Explain. 1 is a main body of a vending machine having a heat insulating material 2, and the inside of this main body 1 is partitioned into two product storage chambers 3a and 3b on the left and right, and each chamber 3
Product shelves 4a and 4b are provided at a and 3b, respectively. Further, the product storage chambers 3a, 3b are provided with evaporators 5a, 5b for cooling, respectively, the product storage chamber 3a is provided with a heater 6 for heating, and each of the chambers 3a, 3
Blower fan 7 for forced circulation of cold air and heating to b
a and 7b are arranged.

Evaporators 5a, 5b and capillary tubes 10a, 10 are arranged in each chamber 3a, 3b.
b and the solenoid valves 12a and 12b are each connected in series, and each combination thereof is connected in parallel and connected to the electric compressor 8 and the condenser 9 to form a cooling system. The solenoid valve 12a, 1
2b is opened and closed by an electric signal based on a cold/hot operation selection switching command.

In the above configuration, when both the product storage chambers 3a and 3b are to be cooled, both the solenoid valves 12a and 12b are opened, and the refrigerant flows through the refrigerant circuit indicated by the solid line arrow to cool both the product storage chambers 3a and 3b. Cooling. When the product storage compartment 3a is heated and the product storage compartment 3b is refrigerated, the solenoid valve 12a is closed and the solenoid valve 12b is opened to allow the refrigerant to flow through the refrigerant circuit indicated by the dotted arrow and only store the product storage compartment 3b. The cooling operation is performed, and the product storage chamber 3a is heated by the heater 6. In addition, in the above combination, when the compressor 8 is stopped, the solenoid valve 12
a, 12b are both closed, and the high-temperature, high-pressure refrigerant in the condenser 9 flows into the first and second capillary tubes 10.
Since the configuration was designed to prevent the refrigerant from flowing into the evaporators 5a and 5b through the refrigerant a and 10b and causing a heat load, two solenoid valves were required to control the refrigerant, which increased costs and caused problems with the operation of the solenoid valves. This requires soundproofing against noise, and also has the disadvantage that power consumption increases due to the increase in input to the solenoid valve.

Purpose of the Invention In view of the above-mentioned drawbacks, the present invention enables switching control of refrigerant flow equivalent to two solenoid valves without using a solenoid valve, and furthermore, high-temperature refrigerant flowing into the evaporator while the compressor is stopped. An object of the present invention is to provide a refrigerant storage that can switch between cold and hot operation and has a refrigerant flow control device that prevents the flow of refrigerant.

Composition of the Invention In order to achieve this object, the present invention provides a differential pressure valve that is activated by a pressure change inside the refrigeration system that is synchronized with the start and stop of a compressor, and a pressure difference between the pressure equivalent to the temperature of the heating heater and the inside of the refrigeration system. The temperature-type differential pressure valve is operated by a heating heater and a capillary tube connected to the evaporator of the chamber having the heating heater, and the differential pressure valve is connected to the downstream side of the condenser. A temperature-type differential pressure valve is provided on the downstream side of the differential pressure valve, and by opening and closing the differential pressure valve according to pressure changes that synchronize with the operation and stop of the compressor, high-temperature refrigerant flows from the condenser to the evaporator when the compressor is stopped. to prevent In addition, during warming, the capillary tube connected to the evaporator in the hot storage chamber is heated by a heating heater, increasing the flow path resistance of the capillary tube and reducing the flow of refrigerant to the evaporator in the hot storage chamber. In addition, when the temperature of the heating heater exceeds a predetermined temperature, the temperature type differential pressure valve is closed to stop the flow of refrigerant to the evaporator located in the hot storage room.

DESCRIPTION OF EMBODIMENTS Hereinafter, as an embodiment of the present invention, a cold/hot switching type storage having two evaporators, particularly a rotary compressor, will be described with reference to FIGS.
The explanation will be given according to FIG. 6, but the same parts as the conventional ones will be given the same numbers and the explanation will be omitted.

The refrigeration system includes a high-pressure container type rotary compressor 8, a condenser 9, an auxiliary capillary tube 102,
Refrigerant control valve 103 first capillary tube 10
4. First evaporator 5b suction line 1
07, Check valve 10 that prevents backflow from the compressor 8
8 are connected in an annular manner, and the second capillary tube 109 is connected in parallel with the first capillary tube 104 and the first evaporator 5b, and the second evaporator 5a are connected in series.
The inlet pipe 110 of the refrigerant control valve 103 is connected to the outlet of the auxiliary capillary tube 102, the first outlet pipe 111 is connected to the inlet of the first capillary tube 104, and the second outlet pipe 112 is connected to the inlet of the first capillary tube 104. It is connected to the inlet of the capillary tube 109. Further, a part of the second capillary tube 109 is brought into contact with the heater 6 for heat exchange.

Next, the configuration of the refrigerant control valve 103 will be explained. A casing 113 having an inlet pipe 110, a first outlet pipe 111, and a second outlet pipe 112, an upper casing 115 provided with a pressure guide pipe 114, and a lower casing 118 having a heat-sensitive cylinder 117 via a pressure guide part 116. The outer shell 119 is formed with an upper pressure responsive element 120a and a lower pressure responsive element 12 inside.
It is divided into an upper pressure sensitive chamber 121, a valve chamber 122, and a lower pressure sensitive chamber 123 at 0b. Spacers 123a and 12 are provided on the sides of the valve chamber 122 of the upper pressure responsive element 120a and the lower pressure responsive element 120b, respectively.
The first ball valve 124 and the second ball valve 125 are integrally attached via 3b. A block 126 is provided between the ball valves 124 and 125, and the block 126 is integrally fixed to a portion of the casing 113 between the inlet pipe 110 and the second outlet pipe 112. The block 126 has a valve seat 127 of the first ball valve 124 and a valve seat 127 of the second ball valve 12.
5, the guide 129 of the first ball valve 124, and the guide 1 of the second ball valve 125.
30 are integrally formed, respectively, and the first valve device 131
and constitute a second valve device 132. Both guides 129 and 130 have refrigerant passage holes 13, respectively.
There are 3,134. In addition, a relatively large diameter through hole 135 is formed in the block 126, passing through the valve seat 127 of the first valve device 131 and the valve seat 128 of the second valve device 132. A communication hole 136 was provided, and the first outlet pipe 111 was connected to the outlet portion of the communication hole 136. A spring 136 is provided in the upper pressure sensitive chamber 121, and presses the first ball valve 124 against the valve seat 127 with a predetermined biasing force. The pressure guiding pipe 114 is connected to a suction line between the rotary compressor 8 and the check valve 108. The lower pressure sensitive chamber 123 is filled with the same refrigerant as that of the refrigeration system. The heat-sensitive tube 117 communicating with the lower pressure-sensitive chamber 123 is fixed to the heater 6 for heat exchange. In other words, lower pressure sensitive chamber 1
A pressure corresponding to the temperature of the heating heater 6 acts on the interior of the heating heater 6, and when the temperature of the heating heater 6 exceeds a predetermined value, the circuit is closed by displacement of the lower pressure responsive element 120b of the lower pressure sensitive chamber 123. It is configured to do so. Further, the control for stopping the operation of the rotary compressor 8 is configured to be performed by a temperature regulator (not shown) of the freezer compartment having the first evaporator 5b.

In the above configuration, the first evaporator 5b,
When cooling a storage 3a having a storage 3a and a storage 3b having a second evaporator 6a, as shown in FIG.
After the pressure is reduced to an intermediate pressure, it flows into the casing 113 having the first valve device 131 from the inlet pipe 110. On the other hand, the suction line 107 of the compressor 8 is at a low pressure due to the operation of the compressor 8. Therefore, the pressure in the upper pressure sensitive chamber 121 connected between the compressor 8 and the check valve 108 is also low, and the upper pressure responsive element 120a is at the intermediate pressure in the casing 113 having the first valve device 131. Due to the pressure difference with the low pressure in the upper pressure sensitive chamber 121, the upper pressure responsive element 120a
Then, the first ball valve 124 is displaced upward, and the first valve device 131 is opened. Therefore, the refrigerant passes through the refrigerant passage hole 133, the through hole 135, and the communication hole 136, is reduced in pressure to a desired low pressure in the first capillary tube 104, flows into the first evaporator 5b, and passes through the suction line 107 check valve. 108, circulates to the compressor 8 and cools the storage 3a. On the other hand, at this time, the pressure inside the through hole 135 is at room temperature.
The lower pressure sensitive chamber 12 is at a pressure equivalent to the temperature of 7.
3, and the lower pressure responsive element 12
0b and the second ball valve 125 are displaced downward,
The second valve device 132 is opened. Then, the refrigerant flows through the through hole 135 and the second capillary tube 109, is reduced in pressure to a desired low pressure in the second capillary tube 109, flows into the second evaporator 5a, and flows through the suction line 107 and the check valve 108. , to the compressor 8 and cool the storage 36.

Next, when the storage 3a is to be refrigerated and the storage 3b is to be heated, when the cold/temperature changeover switch (not shown) of the chamber 3b is switched to warm storage, the heating heater 6 is energized. Then, a part of the second capillary tube 109 is heated by the heat of the heater 6. One side room 3a
The operation of the compressor 8 is controlled in order to perform refrigeration.
Therefore, the refrigerant is in the first capillary tube 104,
The flash gas flows into the second capillary tube 109 together, but since a part of the second capillary tube 109 is heated by the heater 6, the flash gas in the second capillary tube 109 The resistance of the second capillary tube 109 becomes larger than that of the first capillary tube 104, and most of the refrigerant flows to the first capillary tube 104 side, and the refrigerant flows to the first evaporator 5b. and the chamber 3a. The temperature of the chamber 3b is controlled by a thermostat (not shown) for warming.

Moreover, the temperature of the heater 6 rises, and the temperature of the heat-sensitive tube 1 increases.
When the temperature of the thermosensitive tube 11 becomes higher than a predetermined temperature,
7. Through the pressure guiding part 116, the pressure in the lower pressure sensitive chamber 123 becomes higher than the pressure in the through hole 135;
Lower responsive element 120b and second ball valve 12
5 is displaced upward, the second valve device 132 is closed, and the refrigerant flow to the second capillary tube 109 is completely prevented. It is possible to completely prevent an increase in heat load due to refrigerant inflow and evaporation.

Effects of the Invention As is clear from the above description, the present invention has two storage chambers, an evaporator for cooling is provided in the two chambers, a heater for heating is provided in one of the two chambers, and A changeover switch is provided to switch between cold and hot operation, and the first and second evaporators installed in the two chambers are connected in series with the first and second capillary tubes. The series circuits of the pillar tubes are connected in parallel, and the parallel circuit and a compressor, a condenser, a refrigerant control valve having an inlet pipe, a first outlet pipe, and a second outlet pipe constitute a refrigeration system, and the refrigerant The control valve has a built-in second valve device that opens and closes according to a change in the internal pressure of the refrigeration system that is synchronized with the start and stop of the compressor, and a second valve device that opens and closes according to a temperature change in the heating heater. A first valve device is disposed downstream of the condenser via an inlet pipe, and an outlet refrigerant passage of the first valve device is connected to a first capillary without a heating heater via the first outlet pipe. The tube, a second valve device, and a second outlet pipe are respectively connected to a second capillary tube of a chamber having a heating heater, and the second capillary tube and the heating heater are heated. Since it was replaced, when the compressor is stopped, the first valve device located downstream of the condenser closes, preventing high-temperature, high-pressure refrigerant from flowing into the evaporator from the condenser through the capillary tube. This prevents the evaporator from rising in temperature due to high-temperature, high-pressure refrigerant and causing a heat load. In addition, cold/hot switching is performed using a changeover switch, which heats the second capillary tube with the heat of the heating heater, increases the resistance of the second capillary tube, and connects the evaporator on the greenhouse side. greatly reduce the amount of refrigerant flowing into the In addition, when the temperature of the heating heater exceeds a predetermined value, the second valve device is closed, completely preventing refrigerant from flowing into the evaporator on the greenhouse side, so with one refrigerant control valve,
Moreover, it does not require electrical input, and prevents high-temperature refrigerant from flowing into the evaporator when the compressor is stopped, creating a heat load. It also prevents refrigerant from flowing into the evaporator toward the greenhouse side during cold and warm operation. , to obtain a low-noise and power-saving cold/hot temperature switching type storage.

[Brief explanation of drawings]

FIG. 1 is a front view showing the configuration of a conventional cold operation switching type storage, FIG. 2 is a cooling system diagram in FIG. 1, and FIG. 3 is a cooling system diagram of a cold operation switching type storage according to an embodiment of the present invention. , Figure 4 is "cold" -
Diagram of the suction system during “cold” operation, Figure 5 is “cold”
- Diagram of the cooling system during "warm" operation. Figure 6 is a diagram of the cooling system when the compressor is stopped. 8... Rotary compressor, 9... Condenser, 11
0...Inlet pipe, 111...First outlet pipe, 112
... Second outlet pipe, 103 ... Refrigerant control valve, 10
4...First capillary tube, 5b...First evaporator, 109...Second capillary tube, 5a...Second evaporator, 108...Check valve,
131...first valve device, 132...second valve device, 107...suction line.

Claims (1)

[Claims] 1 Two storage chambers are formed in the main body, and a first and second evaporator for cooling are placed in each of the two storage chambers, and a heating evaporator is placed in one of the two chambers. a heater, first and second capillary tubes connected in series with the first and second evaporators, a rotary compressor, and a condenser;
A refrigeration system is constituted by a suction line having a check valve, and a refrigerant control valve having an inlet pipe, a first outlet pipe, and a second outlet pipe, and the refrigerant control valve is configured to synchronize with the stoppage of the compressor. A first valve device that opens and closes according to changes in the internal pressure of the refrigeration system and a second valve device that opens and closes according to changes in the temperature of the heating heater are built in, and the first valve device is located downstream of the condenser. arranged via the inlet pipe, the outlet refrigerant passage of the first valve device is connected via the first outlet pipe with the first capillary tube of the chamber without a warming heater; The second valve device was connected to the second capillary tube of the chamber having the heating heater through the second outlet pipe, and the second capillary tube and the heating heater exchanged heat. Cold/hot storage.