JP4253957B2 - refrigerator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to cost reduction, compactness, and high efficiency of a cooling system in which a refrigerator compartment and a freezer compartment are independently performed.
[0002]
[Prior art]
FIG. 14 shows a refrigeration cycle diagram of a refrigerator disclosed in Japanese Patent Publication No. 62-22396 as an example of a conventional cooling cycle and refrigerator.
[0003]
1 is a constant speed compressor, 2 is a condenser, 3 is a first evaporator provided in the refrigerator compartment 4, and 5 is a second evaporator provided in the freezer compartment 6.
[0004]
Reference numeral 7 denotes a first capillary disposed upstream of the refrigerant circuit of the first evaporator 3 for cooling the refrigerator compartment, and reference numeral 8 denotes an upstream side of the refrigerant circuit of the second evaporator 5 for cooling the freezer compartment. 9 is a check valve provided on the downstream side of the second evaporator 5 for cooling the freezer compartment.
[0005]
Reference numeral 10 denotes a first on-off valve disposed on the downstream side of the refrigerant circuit of the first evaporator 3, and reference numeral 11 denotes a second on-off valve provided on the upstream side of the refrigerant circuit of the second capillary 8.
[0006]
About the refrigerator of the prior art example comprised as mentioned above, the operation | movement is demonstrated below.
[0007]
The operation of the refrigeration cycle is performed as follows. First, the refrigerant compressed by the compressor 1 is condensed and liquefied by the condenser 2. The condensed refrigerant is depressurized by the first capillary 7 or the second capillary 8, flows into the first evaporator 3 and the second evaporator 5, and is evaporated and evaporated, and then returns to the compressor 1 again. Inhaled.
[0008]
Each chamber is cooled by heat exchange between the air in the first and second evaporators 3 and 5 and the refrigerator compartment 4 and the freezer compartment 6 which have become relatively low temperatures due to the evaporation of the refrigerant.
[0009]
The cooling operation of the refrigerator is performed as follows by the temperature detection means and control means of each room (not shown).
[0010]
When each temperature detecting means in the refrigerator compartment 4 and the freezer compartment 6 detects a temperature rise of a predetermined value or more, the compressor 1 is started and the refrigeration cycle is operated. The first on-off valve 10 is opened and the second on-off valve 11 is closed until the temperature detecting means of the refrigerator compartment 4 becomes a predetermined value or less.
[0011]
Thus, the refrigerant flows only to the first evaporator 3 without flowing into the second evaporator 5. At this time, the evaporating temperature of the refrigeration cycle is set to −5 to 0 ° C. when the temperature setting of the refrigerator compartment 4 is about 5 ° C., and 2 to 2 with respect to the normal evaporating temperature of −30 to −25 ° C. The compressor can be operated with a coefficient of performance of 5 times.
[0012]
When the refrigerator compartment 4 is cooled to lower the temperature and the temperature detecting means detects a predetermined value or less, the first on-off valve 10 is closed and the second on-off valve 11 is opened.
[0013]
Thereby, a refrigerant | coolant flows in into the 2nd evaporator 5, and the freezer compartment 6 is cooled. The evaporating temperature of the refrigeration cycle at this time is cooled at a normal evaporating temperature while the temperature setting of the freezer compartment is about -18 ° C.
[0014]
As described above, the refrigerant supply time to the evaporator is distributed between the refrigerator compartment 4 and the freezer compartment 6 and is alternately and repeatedly cooled. Therefore, when the refrigerator compartment 4 is cooled, the refrigerant is independently supplied to the first evaporator. By circulating, a low pressure control valve is unnecessary and a high evaporation temperature (−5 to 0 ° C.) is possible, the compression ratio of the compressor 1 can be reduced, and the operation is performed with a high coefficient of performance to improve efficiency. .
[0015]
Furthermore, the check valve 9 prevents the refrigerant from flowing into the second evaporator 5 because the evaporation temperature during the cooling of the refrigerator compartment 4 is high.
[0016]
When the freezer compartment 6 is cooled, the amount of refrigerant is smaller than that during the cooling of the refrigerator compartment 4, so that the amount of refrigerant is usually excessive. However, since the first on-off valve 10 is provided on the downstream side of the first evaporator 3 and is closed, the refrigerant can be stored in the first evaporator 3 and the amount of refrigerant can be adjusted.
[0017]
[Problems to be solved by the invention]
However, in the refrigerator as described above, since the two on-off valves 10 and 11 are used as means for switching the refrigerant flow path, a space for accommodating the two on-off valves 10 and 11 is required, or two on-off valves are opened and closed. When both the valves 10 and 11 are arranged outside the refrigerator cabinet, the piping structure becomes complicated.
[0018]
In addition, the use of the two on-off valves 10 and 11 is expensive.
[0019]
The present invention solves the above-described conventional problems, and aims to reduce the cost, size, and efficiency of a cooling system that performs a refrigerator compartment and a freezer compartment independently of each other.
[0020]
In order to achieve this object, a refrigerator according to the present invention comprises a refrigerator main body composed of a refrigerator compartment and a freezer compartment, and a machine room partitioned into a part of the refrigerator main body, and includes a variable capacity compressor and a condenser. A three-way valve with a fully-closed function, a first capillary, a first evaporator, a second capillary, a second evaporator, and a first suction line. A second suction line and a check valve are provided, the compressor, the condenser, the dryer, and the three-way valve are connected in series, and the first capillary and the first evaporator are connected via the three-way valve. And connecting the second capillary, the second evaporator, the second suction line, and the check valve so as to be in parallel with the first suction line, Before switching the flow path of the three-way valve, after cooling the freezer, the refrigerant that has accumulated in the second evaporator is operated by operating the variable capacity compressor with the three-way valve fully closed for a predetermined time. While driving out from the second evaporator to the variable capacity compressor side, the check valve prevents the return of the refrigerant and supplies a sufficient amount of refrigerant to the required evaporator with a minimum amount of refrigerant. It is characterized by that.
[0021]
Further, the present invention is characterized in that a three-way valve in which the first discharge pipe outlet and the second discharge pipe outlet are respectively distributed to the left and right is used.
[0022]
In addition, the first capillary inlet and the second capillary inlet are distributed to the left and right with a three-way valve interposed in the machine chamber.
[0023]
Further, the dryer and the check valve are arranged in parallel in the machine room.
[0024]
Further, the three-way valve is arranged so that the three-way valve inlet pipe is horizontal with the dryer.
[0025]
Further, the three-way valve is arranged so that the three-way valve inlet pipe is located below the dryer.
[0026]
Also, a three-way machine that has a machine room partitioned into a part of the refrigerator body and controls the flow path of the refrigerant disposed between the capacity variable compressor, the condenser, and the condenser and the capillary in the machine room. A machine room fan for cooling the valve and the machine room is provided, and the machine room takes in outside air into the machine room by operation of the machine room fan, and guides the air cooled in the machine room to the outside of the machine room. A machine room air passage is configured from the discharge port, a section having a heat radiating port separated from the machine room air path is provided in the machine room, and a three-way valve is provided in the section.
[0027]
Further, the three-way valve is arranged in the heat insulating material.
[0028]
Also, the inner diameter of the three-way valve discharge pipe is made larger than the outer diameter of the capillary so that the first capillary can be inserted into the first discharge pipe of the three-way valve and the second capillary can be inserted into the second discharge pipe, respectively. And
[0029]
In addition, a three-way valve integrated with a dryer is provided.
[0030]
According to the present invention, since a three-way valve is used as means for switching the refrigerant flow path, the cost is reduced and space saving is achieved as compared with the case where two open valves are used.
[0031]
Further, the machine room can be made compact and productivity can be improved by devising the piping structure in the machine room.
[0032]
In addition, by disposing the three-way valve in a place where there is little heat influence, it is possible to suppress a decrease in the degree of supercooling and prevent a decrease in refrigeration capacity, so that the efficiency of the cooling system can be increased.
[0033]
Invention of Claim 1 of this invention consists of a refrigerator main body which has a refrigerator compartment and a freezer compartment inside, and the machine room divided into a part of said refrigerator main body, A capability variable type compressor, a condenser, A flow path can be switched in two directions with the dryer, and a three-way valve with a fully-closed function, a first capillary, a first evaporator, a second capillary, a second evaporator, a first suction line, and a first suction line Two suction lines and a check valve, sequentially connecting the variable capacity compressor, the condenser, the dryer, and the three-way valve in series, and the first capillary and the first through the three-way valve. The second capillary, the second evaporator, the second suction line, and the check valve are connected so that the evaporator and the first suction line are in parallel, and the flow of the three-way valve Switch road Before the cooling of the freezer, after the three-way valve is fully closed for a predetermined time, the variable capacity compressor is operated to change the capacity of the refrigerant remaining in the second evaporator from the second evaporator. While driving out to the mold compressor side, the check valve prevents the return of the refrigerant, supplying a sufficient amount of refrigerant to the required evaporator with a minimum amount of refrigerant, The refrigerator compartment and the freezer compartment are alternately cooled.
[0034]
According to the present invention, since a three-way valve is used as means for switching the refrigerant flow path, the cost is reduced and space saving is achieved as compared with the case where two open valves are used.
[0035]
The invention according to claim 2 of the present invention is characterized by using a three-way valve in which the first discharge pipe outlet and the second discharge pipe outlet are respectively distributed to the left and right.
[0036]
According to this invention, since the first and second discharge pipes connected to the capillary are on the same plane, the three-way valve can be compactly accommodated in the machine room.
[0037]
The invention described in claim 3 of the present invention is characterized in that the first capillary inlet and the second capillary inlet are distributed to the left and right with a three-way valve interposed in the machine chamber.
[0038]
According to the present invention, the first capillary and the second capillary can be easily distinguished at the time of production, and a connection error with the three-way valve discharge pipe can be prevented.
[0039]
The invention according to claim 4 of the present invention is characterized in that the dryer and the check valve are arranged in parallel in the machine room.
[0040]
According to this invention, since both the dryer and the check valve are horizontally long parts, it is possible to reduce the complexity of the piping structure by arranging them in parallel.
[0041]
The invention according to claim 5 of the present invention is characterized in that the three-way valve is arranged so that the three-way valve inlet pipe is horizontal with the dryer.
[0042]
According to the present invention, the refrigerant can be stably supplied to the capillary, and the cooling system can be operated efficiently.
[0043]
In addition, since there is no trap in the piping from the dryer to the three-way valve, liquid pooling can be prevented, so that the amount of refrigerant can be reduced. When a flammable refrigerant is used, the risk of refrigerant leakage can be reduced. .
[0044]
The invention according to claim 6 of the present invention is characterized in that the three-way valve is arranged so that the three-way valve inlet pipe is located below the dryer.
[0045]
According to the present invention, the liquid refrigerant can be stably supplied to the capillaries, and gas traps that cause a reduction in the amount of refrigerant circulation can be prevented, so that the cooling system can be operated more efficiently. .
[0046]
The invention according to claim 7 of the present invention has a machine room partitioned into a part of the refrigerator body, and is disposed between the capacity variable compressor, the condenser, the condenser and the capillary in the machine room. A three-way valve for controlling the flow path of the refrigerant and a machine room fan for cooling the machine room, the machine room taking in outside air into the machine room by operation of the machine room fan, and the machine room A machine room air passage is formed from a discharge port that guides the cooled air to the outside of the machine room, a compartment having a heat radiating port separated from the machine room air passage is provided in the machine room, and a three-way valve is arranged in the compartment. It is characterized by providing.
[0047]
According to the present invention, since the air heated by the cooling of the variable capacity compressor and the condenser does not hit the three-way valve, generation of flash gas due to reheating of the liquid refrigerant radiated and liquefied by the condenser can be prevented, It becomes possible to prevent the freezing capacity from being lowered.
[0048]
Moreover, since the heat radiation opening is provided in the section surrounding the three-way valve, the heat radiation of the three-way valve can be promoted.
[0049]
The invention according to claim 8 of the present invention is characterized in that the three-way valve is disposed in the heat insulating material.
[0050]
According to the present invention, it is possible to reliably prevent the heat effect due to the heat radiation of the variable capacity compressor and the condenser from being exerted on the three-way valve. It becomes possible to drive.
[0051]
According to the ninth aspect of the present invention, the inner diameter of the discharge pipe of the three-way valve is such that the first capillary can be inserted into the first discharge pipe of the three-way valve and the second capillary can be inserted into the second discharge pipe. Is made larger than the outer diameter of the capillary.
[0052]
According to this invention, a welding location can be suppressed to the minimum and productivity improves.
[0053]
Moreover, when using a combustible refrigerant | coolant, it becomes possible to reduce the danger of a refrigerant | coolant leak by reducing a welding location.
[0054]
The invention according to claim 9 of the present invention is characterized in that a three-way valve integrated with a dryer is provided.
[0055]
According to the present invention, since the dryer is directly joined to the three-way valve inlet pipe, the piping structure in the machine room can be simplified and the machine room can be made compact.
[0056]
In addition, since the number of welds can be reduced, productivity is improved, and when a flammable refrigerant is used, the risk of refrigerant leakage can be reduced.
[0057]
Moreover, since the liquid refrigerant liquefied by the condenser can be stably supplied to the capillary, the cooling system can be operated efficiently.
[0058]
【Example】
Embodiments of the present invention will be described below with reference to FIGS. The same components as those of the conventional example are denoted by the same reference numerals, and detailed description thereof is omitted.
[0059]
Example 1
FIG. 1 is a refrigeration cycle diagram of a refrigerator in Embodiment 1 of the present invention, and FIG. 2 is a time chart of the embodiment.
[0060]
Reference numeral 20 denotes a refrigerator body, which has a refrigerator compartment 4 which is a relatively high temperature compartment and a freezer compartment 6 which is a relatively low temperature compartment, and is configured to be insulated from the surroundings with a heat insulating material such as polyurethane foam. ing. The storage of food and other items is performed through a heat insulating door (not shown).
[0061]
The refrigerator compartment 4 is usually set at 3 to 5 ° C. for refrigerated storage, but may be set at a slightly lower temperature, for example, −3 to 0 ° C. for improving the freshness, and may be used depending on the stored items. In some cases, a person can freely switch the temperature setting as described above. In addition, in order to preserve wine, root vegetables, etc., the temperature may be set slightly higher, for example, around 10 ° C.
[0062]
The freezer compartment 6 is usually set at −22 to −18 ° C. for frozen storage, but may be set at a lower temperature, for example −30 to −25 ° C., for improving freshness.
[0063]
The refrigeration cycle 12 sequentially connects the variable capacity compressor 1, the condenser 2, the dryer 10, the three-way valve 11, the first capillary 7, the first evaporator 3, and the first suction line 18, and the three-way valve 11 is connected. The second capillary 8, the second evaporator 5, the second suction line 19 and the second capillary 8 are arranged in parallel with the first capillary 7, the first evaporator 3 and the first suction line 18. A check valve 9 is connected in the middle of the suction line 19.
[0064]
The three-way valve 11 is operated by a driving means such as a pulse motor, and is energized only during the opening / closing operation.
[0065]
The first evaporator 3 is disposed in the refrigerating chamber 4, for example, on the back surface of the refrigerating chamber 4, and in the vicinity, the air in the compartment of the refrigerating chamber 4 is passed through the first evaporator 3 and circulated. One electric fan 13 is provided.
[0066]
The second evaporator 5 is disposed in the freezer compartment 6, for example, on the back surface of the freezer compartment 6, and in the vicinity, the air in the compartment of the freezer compartment 6 is circulated through the second evaporator 5. A second electric fan 14 is provided.
[0067]
The variable capacity compressor 1, the condenser 2, the dryer 10, the three-way valve 11, and the check valve 9 can reduce the number of pipe connections in the refrigerator main body 20 from the viewpoint of improving safety when, for example, a flammable refrigerant is used. Therefore, it is disposed in the machine room 15.
[0068]
The refrigerant returned from each of the evaporators 3 and 5 is discharged through the compressor discharge pipe 17 after being discharged to the internal space of the variable capacity compressor 1 through the compressor suction pipe 16.
[0069]
The variable capacity compressor 1 is a variable capacity type that can change the refrigeration capacity by controlling the refrigerant circulation amount by, for example, rotation speed control.
[0070]
Further, the refrigerator compartment 4 and the freezer compartment 6 are provided with temperature detecting means for detecting a temperature in the compartment (not shown), for example, a thermistor, and the compressor 1, the three-way valve 11, the first electric fan 13, and the second Control means 12A for controlling the electric fan 14 is provided.
[0071]
About the refrigerator comprised as mentioned above, the cooling timing of the refrigerator compartment 4 and the freezer compartment 6 is demonstrated based on the time chart of FIG.
[0072]
When the variable capacity compressor 1 is stopped, when the temperature detecting means of either the refrigerator compartment 4 or the freezer compartment 6 detects a predetermined temperature or higher, the control means 12A receives this signal, for example, the freezer compartment When the temperature detecting means 6 detects a predetermined temperature (t2H) or higher set in advance, the compressor 1 and the second electric fan 14 are operated to open the three-way valve 11 to the second capillary 8 side (T1). .
[0073]
The high-temperature and high-pressure refrigerant discharged by the operation of the variable capacity compressor 1 releases heat in the condenser 2 to be condensed and liquefied, and reaches the second capillary 8 through the three-way valve 11. Thereafter, the second capillary 8 is depressurized while exchanging heat with the second suction line 19, and reaches the second evaporator 5. By the operation of the second electric fan 14, heat is actively exchanged with the air in the freezer compartment 6, and the refrigerant evaporates in the second evaporator 5 and the heat-exchanged air becomes cooler air. The freezer compartment 6 is discharged and cooled. The vaporized refrigerant is sucked into the variable capacity compressor 1 through the second suction line 19.
[0074]
When the temperature detection means of the freezer compartment 6 detects a temperature (t2L) or less set in advance during cooling of the freezer compartment 6, the three-way valve 11 is fully closed, the second electric fan 14 is stopped, and the freezer compartment 6 is cooled. End (T2).
[0075]
The variable capacity compressor is operated in a state where the three-way valve 11 is fully closed and the refrigerant flow is shut off for a predetermined time (T2 to T3).
[0076]
After a predetermined time has elapsed, the three-way valve 11 is opened to the first capillary 7 side, and the first electric fan 13 is operated to start cooling the refrigerator compartment 4 (T3).
[0077]
The refrigerant reaches the first capillary 7 through the three-way valve 11. Thereafter, the first capillary 7 is decompressed while exchanging heat with the first suction line 18, and reaches the first evaporator 3. The first electric fan 13 is activated to actively exchange heat with the air in the refrigerator compartment 4, and the refrigerant evaporates in the first evaporator 3 so that the heat-exchanged air becomes relatively cool air. The refrigerating chamber 4 is discharged and cooled. The vaporized refrigerant is sucked into the variable capacity compressor 1 through the first suction line 18.
[0078]
Since the check valve 19 is disposed in the middle of the second suction line 19, the refrigerant passing through the first suction line 18 stays in the second evaporator 5 through the second suction line 19. Never do.
[0079]
When the temperature detection means of the freezer compartment 6 detects a predetermined temperature (t2H) or higher during cooling of the refrigerator compartment 4, the first electric fan 13 is stopped and the three-way valve 11 is moved to the second capillary 8 side. While opening, the 2nd electric fan 14 is operated and cooling of the freezer compartment 6 is started (T4).
[0080]
By repeating the above operation and switching the flow of the refrigerant using the three-way valve 11, the refrigerator compartment 4 and the freezer compartment 6 are alternately cooled, and both temperature detecting means for the refrigerator compartment 4 and the refrigerator compartment 6 are preset. When it is detected that the temperature is lower than the predetermined temperatures (t1 and t2L), the variable capacity compressor 1 is stopped (T5).
[0081]
After the cooling of the freezer compartment 6, the three-way valve 11 is fully closed for a predetermined time to operate the variable capacity compressor 1 in a state where the refrigerant flow is completely cut off, so that the pressure in the variable capacity compressor 1 is maintained during normal operation. Therefore, the refrigerant staying in the second evaporator 5 can be expelled from the second evaporator 5 to the variable capacity compressor 1 side. As a result, since sufficient refrigerant for cooling the refrigerator compartment 4 is supplied to the first evaporator 3 when switching to the refrigerator compartment 4 cooling, the refrigerant circulation amount is not insufficient and the refrigerator compartment 4 is efficiently cooled. It becomes possible.
[0082]
Similarly, when switching from the refrigerator compartment 4 cooling to the freezer compartment 6 cooling, the variable capacity compressor 1 can be quickly operated by fully closing the three-way valve 11 for a predetermined time and completely shutting off the refrigerant flow. In addition, since the refrigerant staying in the first evaporator 3 can be expelled to the variable capacity compressor 1 side, the freezer compartment 6 can be efficiently cooled.
[0083]
In addition, since the refrigerant can be used efficiently, the amount of the refrigerant can be reduced, and when a flammable refrigerant is used, the danger at the time of refrigerant leakage can be reduced.
[0084]
In addition, since the three-way valve 11 is used as means for switching the refrigerant flow path, the number of pipe connection points can be reduced compared to the case of using two open valves as in the prior art, and when using a flammable refrigerant, refrigerant leakage It becomes possible to reduce the danger of time.
[0085]
Further, since the flow path of the refrigerant is switched using one three-way valve 11, the cost is lower and the space can be saved as compared with the case where two conventional open valves are used.
[0086]
(Example 2)
FIG. 3 is a refrigeration cycle diagram of the refrigerator in Embodiment 2 of the present invention.
[0087]
Reference numeral 11 denotes a three-way valve body disposed in the machine room 15.
[0088]
The three-way valve 11 is composed of a three-way valve inlet pipe 21, a first discharge pipe 22, and a second discharge pipe 23. The first discharge pipe 22 and the second discharge pipe 23 are 180 degrees opposite in the left-right direction. It is distributed.
[0089]
The first capillary 7 is connected to the first discharge pipe 22, and the second capillary is connected to the second discharge pipe 23.
[0090]
Since the first discharge pipe 22 and the second discharge pipe 23 are distributed to the left and right, the three-way valve 11 can be stored in the machine chamber 15 in a compact manner.
[0091]
Further, the first discharge pipe 22 and the second discharge pipe 23 can be easily distinguished, and a connection error between the three-way valve discharge pipes 22 and 23 and the capillaries 7 and 8 can be prevented during production.
[0092]
If the three-way valve inlet pipe 21 is configured to be parallel to the first discharge pipe 22 or the second discharge pipe 23, the three-way valve 11 can be accommodated in the machine chamber 15 in a more compact manner.
[0093]
In addition, as shown in FIG. 4, the 1st suction line 18 and the 2nd suction line 19 are connected within the polyurethane foam which is a heat insulating material, and the non-return valve 9 is also arrange | positioned in a polyurethane foam, When the compressor suction pipe 16 is taken out from the cabinet 24 into the machine room 15 and connected to the variable capacity compressor 1, the piping structure can be simplified in the machine room 15, and the piping can be accommodated in the machine room 15 more compactly. It becomes.
[0094]
Although the check valve 9 is disposed in the polyurethane foam, it may be disposed in the freezer compartment 5.
[0095]
(Example 3)
FIG. 5 is a refrigeration cycle diagram of the refrigerator in Example 3 of the present invention.
[0096]
Reference numeral 11 denotes a three-way valve body disposed in the machine room 15.
[0097]
The first capillary 7 is connected to the first discharge pipe 22, and the second capillary 8 is connected to the second discharge pipe 23.
[0098]
In addition, the first capillary 7 inlet and the second capillary 8 inlet have a piping structure in which the three-way valve 11 is sandwiched in the machine chamber 15 in the opposite directions 180 degrees to the left and right.
[0099]
This facilitates discrimination between the first capillary 7 and the second capillary 8 coming out of the cabinet 24 into the machine room 15 and prevents a connection error between the three-way valve discharge pipes 22 and 23 and the capillaries 7 and 8 during production. It becomes possible to do.
[0100]
If the three-way valve 11 has a structure in which the first discharge pipe 22 and the second discharge pipe 23 are distributed to the left and right, it is possible to further prevent connection errors.
[0101]
(Example 4)
FIG. 6 is a refrigeration cycle diagram of the refrigerator in Example 4 of the present invention.
[0102]
Reference numeral 10 denotes a dryer. Reference numeral 9 denotes a check valve 9 for preventing the refrigerant from flowing into the second evaporator 5 because the freezer compartment 6 is at a low temperature during cooling of the refrigerator compartment 4.
[0103]
The dryer 10 and the check valve 9 are arranged in parallel in the machine room 15.
[0104]
Since both the dryer 10 and the check valve 9 are horizontally long parts, when there is not enough space in the machine room 15, the pipes can be stored in the machine room 15 in a compact manner by arranging them in parallel. It becomes possible.
[0105]
(Example 5)
FIG. 7 is a refrigeration cycle diagram of the refrigerator in Example 5 of the present invention.
[0106]
In the machine room 15, the three-way valve 11 is arranged so that the three-way valve inlet pipe 21 is horizontal with the dryer 10.
[0107]
Since there is no trap in the piping path from the dryer 10 to the three-way valve inlet pipe 21, the liquid refrigerant radiated and liquefied by the condenser 2 can be stably supplied to the first capillary 7 and the second capillary 8. It becomes possible to operate the cooling system efficiently.
[0108]
Further, since liquid accumulation in the piping path from the dryer 10 to the three-way valve inlet pipe 21 can be prevented, the amount of refrigerant can be reduced, and when a flammable refrigerant is used, the risk of refrigerant leakage can be reduced. Become.
[0109]
(Example 6)
FIG. 8 is a refrigeration cycle diagram of the refrigerator in Example 6 of the present invention.
[0110]
In the machine room 15, the three-way valve 11 is arranged so that the three-way valve inlet pipe 21 is below the dryer 10.
[0111]
As a result, the liquid refrigerant radiated and liquefied by the condenser 2 can be more reliably and stably supplied to the first capillary 7 and the second capillary 8, so that the inlets of the capillaries 7 and 8 that cause a reduction in the amount of refrigerant circulation. It is possible to prevent gas jamming in the section and to operate the cooling system efficiently.
[0112]
If the three-way valve inlet pipe 21 has a structure protruding upward from the horizontal from the main body of the three-way valve 11, the liquid refrigerant can be supplied to the capillary more stably, and the cooling system can be operated more efficiently.
[0113]
(Example 7)
FIG. 9 is a cross-sectional view of the refrigerator in the seventh embodiment of the present invention.
[0114]
Reference numeral 20 denotes a refrigerator main body, and reference numeral 15 denotes a machine room 15 arranged at the lower rear side of the refrigerator main body 20 constituted by a machine room partition plate 30 and a metal machine room cover 26.
[0115]
Reference numeral 27 denotes a front suction port for taking air into the machine room 15 from the front surface of the refrigerator body 20, and a rear suction port 28 for taking air into the machine room 15 from the rear side of the refrigerator body 20 and the machine room in the machine room cover 26. 15 is provided with a discharge port 29 for discharging the air cooled inside.
[0116]
In the machine room 15, a variable capacity compressor 1, a condenser 2, and a machine room fan 25 are arranged, and the three-way valve 11 is arranged in a section separated into the machine room 15 by a three-way valve partition plate 31. It is installed.
[0117]
The machine room cover 26 that forms a section separated from the three-way valve partition plate 31 is provided with a heat radiation port 32.
[0118]
The flow of air in the machine room 15 is as follows. The air sucked from the front suction port 27 and the rear suction port 28 by driving the machine room fan 25 passes through the machine room fan 25 and cools the condenser 2 and the variable capacity compressor 1. The air heated by the cooling of the condenser 2 and the variable capacity compressor 1 passes through the outside of the compartment partitioned by the three-way valve partition plate 31 and is discharged out of the machine chamber 15 through the discharge port 29.
[0119]
Since the air heated by the cooling of the variable capacity compressor 1 and the condenser 2 does not hit the three-way valve 11, generation of flash gas due to reheating of the liquid refrigerant radiated and liquefied by the condenser 2 can be prevented. It becomes possible to prevent a decline in ability.
[0120]
Further, since the heat radiation port 32 is provided in the machine room cover 26 that forms a section surrounding the three-way valve 11, the heat radiation of the three-way valve 11 can be promoted.
[0121]
In FIG. 9, the compartment surrounding the three-way valve 11 is provided downstream of the machine room fan 25. However, the machine room cover 26 provided with the heat radiation port 32 and the compartment can be formed anywhere in the machine room 15. Similar effects can be obtained.
[0122]
Further, as shown in FIG. 10, the same effect can be obtained by forming a section partitioned by a three-way valve partition plate 31 having a heat radiation port 32 upstream of the machine room fan 25 and disposing the three-way valve 11 in the section. Is obtained.
[0123]
Although the case where the front suction port 27 is provided has been described, the front suction port 27 is not provided, the machine room 15 is completely separated by the machine room partition plate 30, and the suction room is provided in the machine room cover 26. The same effect can be obtained when only the rear suction port 28 is provided.
[0124]
(Example 8)
FIG. 11 is a refrigeration cycle diagram of the refrigerator in Example 8 of the present invention.
[0125]
Reference numeral 20 denotes a refrigerator body, which is configured to be insulated from the surroundings with a heat insulating material such as polyurethane foam. A three-way valve 11 for switching the refrigerant flow path is disposed in the heat insulating material.
[0126]
Thereby, since it is possible to reliably prevent the heat effect due to the heat radiation of the variable capacity compressor 1 and the condenser 2 from reaching the three-way valve 11, it is possible to suppress a decrease in the degree of supercooling due to the heating of the three-way valve 11. As a result, it is possible to prevent a decrease in the refrigerating capacity and to efficiently operate the cooling system.
[0127]
Further, by placing the three-way valve 11 in the heat insulating material, the piping structure in the machine room 15 can be simplified and the machine room 15 can be made compact.
[0128]
By arranging the three-way valve 11 in the vicinity of the first suction line 18 and the second suction line 19, the three-way valve 11 is three-wayd by a relatively low-temperature refrigerant flowing through the first suction line 18 or the second suction line 19. Since heat dissipation of the valve 11 can be promoted, the degree of supercooling can be increased, and the cooling system can be operated more efficiently.
[0129]
Example 9
FIG. 12 is a partial cross-sectional view of a three-way valve according to Embodiment 9 of the present invention.
[0130]
D1 is the inner diameter of the first and second discharge pipes, and D2 is the outer diameter of the first and second capillaries 7 and 8. The inner diameter D1 of the discharge pipe is larger than the outer diameter D2 of the capillaries 7 and 8, so that the first capillary 7 can be inserted into the first discharge pipe 22 and the second capillary 8 can be inserted into the second discharge pipe 23, respectively. It has become.
[0131]
Thereby, the welding location of the three-way valve 11 and the 1st and 2nd capillaries 7 and 8 can be suppressed to the minimum two locations, and productivity improves.
[0132]
Moreover, when using a combustible refrigerant | coolant, it becomes possible to reduce the danger of a refrigerant | coolant leak by reducing a welding location.
[0133]
(Example 10)
FIG. 13 is a partial cross-sectional view of a three-way valve in Example 10 of the present invention. Moreover, it demonstrates using FIG. 1 as a refrigeration cycle figure.
[0134]
The outlet 10 of the dryer 10 is directly joined to the three-way valve inlet pipe 21 and the dryer 10 and the three-way valve 11 are integrated.
[0135]
Since the dryer 10 is directly joined to the three-way valve 11, the connecting pipe between the dryer 10 and the three-way valve 11 is not required, the cost can be reduced, and the piping structure can be simplified so that the machine room 15 can be made compact. Become.
[0136]
In addition, the required volume of refrigerant can be reduced by reducing the volume of pipes without connecting pipes, and the number of welds can be reduced, improving productivity and reducing the risk of refrigerant leakage when using flammable refrigerants. It becomes.
[0137]
Further, since the dryer 10 is directly joined to the three-way valve 11, the liquid refrigerant radiated and liquefied by the condenser 2 can be stably supplied to the first capillary 7 and the second capillary 8, so that the refrigerant circulation rate is reduced. As a result, it is possible to prevent gas trapping at the capillary inlet and to operate the cooling system efficiently.
[0138]
Although the dryer 10 is directly joined to the three-way valve inlet pipe 21, the same effect can be obtained when the three-way valve inlet pipe 21 itself has a structure having a net-like filter for accumulating a water absorbing material and impurities.
[0139]
【The invention's effect】
The present invention is carried out in the state as described above, and has the following effects.
[0140]
A refrigerator body having a refrigerator compartment and a freezer compartment, and a machine room partitioned into a part of the refrigerator body, the flow capacity can be switched in two directions, a variable capacity compressor, a condenser and a dryer; and Variable capacity with three-way valve with fully closed function, first capillary, first evaporator, second capillary, second evaporator, first suction line, second suction line and check valve The second capillary so that the first compressor, the condenser, the dryer, and the three-way valve are connected in series, and in parallel with the first capillary, the first evaporator, and the first suction line via the three-way valve. And the second evaporator, the second suction line and the check valve are connected, and the flow path of the three-way valve is switched. Before the cooling of the freezer, after the three-way valve is fully closed for a predetermined time, the variable capacity compressor is operated to change the capacity of the refrigerant remaining in the second evaporator from the second evaporator. While driving out to the mold compressor side, the check valve prevents the return of the refrigerant, supplying a sufficient amount of refrigerant to the required evaporator with a minimum amount of refrigerant, The refrigerator compartment and the freezer compartment are alternately cooled.
[0141]
According to the present invention, since a three-way valve is used as means for switching the refrigerant flow path, the cost is reduced and space saving is achieved as compared with the case where two open valves are used.
[0142]
Further, the three-way valve in which the first discharge pipe outlet and the second discharge pipe outlet are respectively distributed to the left and right is used, and the first and second discharge pipes connected to the capillary are on the same plane. As a result, the three-way valve can be stored compactly in the machine room.
[0143]
In addition, the first capillary inlet and the second capillary inlet are distributed to the left and right across the three-way valve in the machine room, making it easy to distinguish between the first capillary and the second capillary during production. It is possible to prevent a connection error between the three-way valve discharge pipe and the capillary.
[0144]
In addition, the dryer and the check valve are arranged in parallel in the machine room. Since both the dryer and the check valve are horizontally long parts, the piping is arranged by arranging them in parallel. It becomes possible to reduce the complexity of the structure.
[0145]
Also, the three-way valve is arranged so that the three-way valve inlet pipe is level with the dryer, and the cooling system can be stably supplied to the capillary so that the cooling system can be operated efficiently. Since there is no trap in the piping from the dryer to the three-way valve, liquid pooling can be prevented, reducing the amount of refrigerant. When using flammable refrigerant, the risk of refrigerant leakage can be reduced. Become.
[0146]
In addition, the three-way valve is arranged so that the three-way valve inlet pipe is below the dryer, so that liquid refrigerant can be stably supplied to the capillary, preventing gas clogging that causes a reduction in refrigerant circulation. This makes it possible to operate the cooling system more efficiently.
[0147]
A three-way valve having a machine room partitioned in a part of the refrigerator main body and controlling a refrigerant flow path disposed between the variable capacity compressor, the condenser, the condenser, and the capillary in the machine room; A machine room fan that cools the machine room is provided, and the machine room winds from the suction port for taking outside air into the machine room by the operation of the machine room fan and the discharge port for guiding the air that has cooled the machine room to the outside of the machine room. The passage was constructed, and the machine room was provided with a compartment with a heat release port separated from the machine room air passage, and the temperature was raised by cooling the variable capacity compressor and the condenser by arranging a three-way valve in the compartment. Since air does not hit the three-way valve, it is possible to prevent the generation of flash gas due to reheating of the liquid refrigerant radiated and liquefied by the condenser, and it is possible to prevent the refrigerating capacity from being lowered. Because of the heat dissipation of the three-way valve It is possible to promote.
[0148]
In addition, by disposing the three-way valve in the heat insulating material, it is possible to reliably prevent the heat effect due to heat dissipation of the variable capacity compressor and condenser from reaching the three-way valve, so the degree of supercooling is reduced by heating the three-way valve. Can be suppressed, and the cooling system can be operated more efficiently.
[0149]
Also, by making the inner diameter of the discharge pipe of the three-way valve larger than the outer diameter of the capillary so that the first capillary can be inserted into the first discharge pipe of the three-way valve and the second capillary can be inserted into the second discharge pipe, respectively. In addition, the welding location can be minimized, the productivity is improved, and when a flammable refrigerant is used, the risk of refrigerant leakage can be reduced by reducing the welding location.
[0150]
In addition, by using a three-way valve integrated with the dryer, the piping structure in the machine room can be simplified, the machine room can be made compact, and the number of welds can be reduced, so that the productivity is improved and the combustible refrigerant is improved. When using, it becomes possible to reduce the risk of refrigerant leakage.
[Brief description of the drawings]
FIG. 1 is a refrigeration cycle diagram of a refrigerator in an embodiment of claim 1 of the present invention.
FIG. 2 is a time chart of the refrigerator in the embodiment of claim 1 of the present invention.
FIG. 3 is a refrigeration cycle diagram of the refrigerator in the embodiment of claim 2 of the present invention.
FIG. 4 is a refrigeration cycle diagram of the refrigerator in the embodiment of claim 2 of the present invention.
FIG. 5 is a refrigeration cycle diagram of a refrigerator in an embodiment of claim 3 of the present invention.
FIG. 6 is a refrigeration cycle diagram of the refrigerator in the embodiment of claim 4 of the present invention.
FIG. 7 is a refrigeration cycle diagram of the refrigerator in the embodiment of claim 5 of the present invention.
FIG. 8 is a refrigeration cycle diagram of the refrigerator in the embodiment of claim 6 of the present invention.
FIG. 9 is a cross-sectional view of a refrigerator according to an embodiment of claim 7 of the present invention.
FIG. 10 is a cross-sectional view of a refrigerator according to an embodiment of claim 7 of the present invention.
FIG. 11 is a refrigeration cycle diagram of a refrigerator in an embodiment of claim 8 of the present invention.
FIG. 12 is a partial sectional view of a three-way valve according to an embodiment of claim 9 of the present invention;
FIG. 13 is a partial sectional view of a three-way valve according to an embodiment of claim 10 of the present invention;
FIG. 14 is a refrigeration cycle diagram of a conventional refrigerator.
[Explanation of symbols]
1 Variable capacity compressor
2 Condenser
3 First evaporator
4 Cold room
5 Second evaporator
6 Freezer room
7 First capillary
8 Second capillary
9 Check valve
10 Dryer
11 Three-way valve
12 Refrigeration cycle
13 First electric fan
14 Second electric fan
15 Machine room
16 Compressor suction pipe
17 Compressor discharge pipe
18 First suction line
19 Second suction line
20 Refrigerator body

Claims (10)

It consists of a refrigerator body having a refrigerator compartment and a freezer compartment inside, and a machine room partitioned into a part of the refrigerator body, and the flow path can be switched in two directions: a variable capacity compressor, a condenser and a dryer. And a three-way valve with a fully closed function, a first capillary, a first evaporator, a second capillary, a second evaporator, a first suction line, a second suction line, and a check valve, The capacity variable compressor, the condenser, the dryer, and the three-way valve are sequentially connected in series, and in parallel with the first capillary, the first evaporator, and the first suction line through the three-way valve. After connecting the second capillary, the second evaporator, the second suction line, and the check valve, and before switching the flow path of the three-way valve, after cooling of the freezer compartment, With the three-way valve fully closed for a specified time By operating the variable compressor, the refrigerant staying in the second evaporator is expelled from the second evaporator to the capacity variable compressor side, and the return valve prevents the refrigerant from returning. A refrigerator characterized in that a sufficient amount of refrigerant is supplied to a necessary evaporator with a minimum amount of refrigerant, and the refrigerator compartment and the freezer compartment are alternately cooled.   The refrigerator according to claim 1, wherein a three-way valve in which the first discharge pipe outlet and the second discharge pipe outlet are respectively distributed to the left and right is used.   The refrigerator according to claim 1 or 2, wherein the inlet of the first capillary and the inlet of the second capillary are distributed to the left and right with a three-way valve in between in the machine room.   The refrigerator according to any one of claims 1 to 3, wherein the dryer and the check valve are arranged in parallel in the machine room.   The refrigerator according to any one of claims 1 to 4, wherein the three-way valve is disposed so that the three-way valve inlet pipe is horizontal with the dryer.   The refrigerator according to any one of claims 1 to 4, wherein the three-way valve is disposed so that the three-way valve inlet pipe is located below the dryer.   A three-way valve having a machine room partitioned in a part of the refrigerator main body and controlling a refrigerant flow path disposed between the variable capacity compressor, the condenser, and the condenser and the capillary in the machine room; A machine room fan for cooling the machine room is provided, the machine room has a suction port for taking outside air into the machine room by operation of the machine room fan, and a discharge port for guiding the air cooled in the machine room to the outside of the machine room 2. A machine room air passage is configured from the above, a section having a heat radiating port separated from the machine room air path is provided in the machine room, and a three-way valve is disposed in the section. refrigerator.   The refrigerator according to claim 1, wherein the three-way valve is disposed in the heat insulating material.   The inner diameter of the discharge pipe of the three-way valve is made larger than the outer diameter of the capillary so that the first capillary can be inserted into the first discharge pipe of the three-way valve and the second capillary can be inserted into the second discharge pipe, respectively. The refrigerator according to any one of claims 1 to 8.   The refrigerator according to claim 1 or 4, further comprising a three-way valve integrated with a dryer.

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