JP5175767B2 - refrigerator - Google Patents

Description

  The present invention relates to a refrigerator suitable for one having a plurality of evaporators for cooling a refrigerator compartment or a freezer compartment.

  In recent years, refrigerators can be cooled independently using a plurality of evaporators such as a refrigeration evaporator and a refrigeration evaporator from the viewpoint of stabilizing the temperature in a plurality of refrigerator compartments and freezer compartments. Done.

  The refrigeration evaporator and the refrigeration evaporator, which cool the interior of each cabinet using a plurality of evaporators, have a parallel arrangement and a serial arrangement, which are switched and controlled by a three-way valve.

  In the parallel-arranged refrigeration evaporator and refrigeration evaporator that are controlled to be switched by a three-way valve, the refrigerant flows only in the refrigeration evaporator during the cooling operation of the refrigeration chamber, while the refrigerant flows during the cooling operation of the freezer compartment. The refrigerant flows only in the refrigeration evaporator. Further, during the simultaneous cooling operation of the refrigerating room and the freezing room, a refrigerant circuit is configured in which refrigerant flows through the refrigerating evaporator and the refrigerating evaporator simultaneously (see Patent Document 1).

  On the other hand, in the refrigeration evaporator and the refrigeration evaporator, which are serially arranged and controlled by a three-way valve, during the cooling operation of the refrigeration room, the refrigerant flows in the order of the refrigeration evaporator and the refrigeration evaporator. During the cooling operation of the chamber, the refrigerant flows only to the refrigeration evaporator. Further, during the simultaneous cooling operation of the refrigerating room and the freezing room, a refrigerant circuit is formed in which refrigerant flows through the refrigerating evaporator and the refrigerating evaporator simultaneously (see Patent Document 2).

JP 2001-82851 A JP 2002-81817 A

  The latter means in series with the former means in which the refrigeration evaporator and the refrigeration evaporator are arranged in parallel have their merits and demerits, for example, the refrigerant during the refrigerating room cooling operation for cooling only the refrigerating room The problem of stagnation. In particular, in the latter means arranged in series, the refrigerant passes in the order of the refrigerating evaporator in the operation stop state after passing through the refrigerating room evaporator when the refrigerating room is cooled. Under the influence of the temperature of the evaporator, the refrigerant retention problem becomes prominent in the refrigeration evaporator.

  Therefore, the present invention proposes a new arrangement that adopts the advantages of the parallel arrangement, and has a refrigerator that can suppress a refrigerant retention amount of the refrigeration evaporator as much as possible and secure a suitable refrigerant circulation amount. The purpose is to provide.

In the present invention in order to achieve the above object, a compressor for discharging a refrigerant, a condenser mutually connected to the compressor, a first discharge port for switching the flow path or flow of refrigerant from said condenser cooling the the switching valve and a second discharge port, and a refrigerating evaporator for cooling the refrigerating compartment is connected to the first discharge port of the switching valve, the freezing chamber connected to the second discharge port of the switching valve a refrigeration evaporator, equipped with, the outlet side refrigerant pipe which extends outside a portion of the outlet side refrigerant pipe of the refrigerating evaporator causes disposed in the freezing evaporator, toward the compressor refrigeration the Rutoki is connected to the outlet side refrigerant pipe of the use evaporator confluence, the pipe diameter of the outlet side refrigerant pipe of the refrigerating evaporator disposed in the freezing evaporator, the refrigerant pipe in said freezer evaporator The diameter is smaller than the pipe diameter .

In practicing the present invention, first, the outlet refrigerant pipe diameter of the refrigeration evaporator disposed in the refrigeration evaporator is smaller than the pipe diameter of the refrigerant pipe in the refrigeration evaporator. By doing so, it is desirable to be able to suppress the amount of refrigerant remaining in the refrigerant pipe as a part.

2ndly, the refrigerant | coolant evaporator exit side refrigerant | coolant piping arrange | positioned in the said refrigeration evaporator is set so that it may face a windward side rather than the refrigerant | coolant piping in the said refrigeration evaporator, At the time of heat exchange It is desirable to be able to suppress the amount of refrigerant remaining in the refrigerant piping that becomes a part of the refrigerant while suppressing the efficiency .

Third, the fin pitch of the fins provided in the refrigerant pipe in the outlet of the refrigerating evaporator is set to the fin pitch of the fins provided in the refrigerant pipe in the refrigerating evaporator. It is desirable to make it coarser so that the efficiency during heat exchange can be suppressed and the amount of refrigerant remaining in the refrigerant piping as a part can be reduced.

Fourthly, the outlet side refrigerant pipe of the refrigeration evaporator disposed in the refrigeration evaporator has a groove-free pipe having no groove on the inner surface, and the refrigerant pipe in the refrigeration evaporator has a groove having a groove on the inner surface. It is desirable to use the pipe so that the efficiency during heat exchange can be suppressed and the amount of refrigerant remaining in the refrigerant pipe as a part can be reduced.

Fifth, it becomes a part by making the piping total length of the outlet side refrigerant piping of the refrigeration evaporator arranged in the refrigeration evaporator shorter than the total piping length of the refrigerant piping in the refrigeration evaporator. It is desirable to be able to suppress the retention amount of the refrigerant staying in the refrigerant pipe.

Sixthly, the refrigerant pipe at the outlet side of the refrigeration evaporator disposed in the refrigeration evaporator has fins over the entire area of the pipe, thereby suppressing the efficiency at the time of heat exchange and forming a part in the refrigerant pipe. It is desirable to be able to reduce the amount of refrigerant that stays.

  According to the present invention, at the time of cooling the refrigerating room, by switching the three-way valve, the refrigerant passes through the refrigerating evaporator and then flows in the order of the refrigerating evaporator, so that the inside of the refrigerating room can be cooled. At this time, the refrigerant that flows in the order of the refrigerator compartment evaporator and the freezer compartment evaporator is the refrigerant that remains in the refrigerant pipe by the refrigerant pipe of a part of the refrigerator evaporator independent of the temperature in the freezer evaporator. By keeping the staying amount small, it is possible to secure a suitable refrigerant circulation amount, and an efficient cooling operation can be performed.

The schematic block diagram of the refrigerating cycle concerning this invention. The schematic explanatory drawing which showed the specific example of the evaporator for refrigeration. The schematic explanatory drawing which showed the specific example of the evaporator for freezing. The same explanatory drawing as FIG. 2 which eliminated the fin over the whole area | region of the exit side refrigerant | coolant piping of the evaporator for freezing in the evaporator for freezing. The outline perspective view (a) which showed a part of exit side refrigerant | coolant piping of the refrigeration evaporator in the evaporator for freezing, and the schematic perspective view (b) which showed a part of refrigerant | coolant piping of the refrigerating evaporator.

  Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 5.

  FIG. 1 shows a schematic configuration diagram of a refrigeration cycle of a refrigerator (not shown) according to the present invention, outside a refrigeration evaporator 1 for cooling a refrigeration chamber and a freezing evaporator 3 for cooling a refrigeration chamber. , A compressor 5, a condenser 7, and a three-way valve 9 serving as a switching valve.

  The three-way valve switches and controls the flow path or flow rate of the refrigerant, and has an inlet port 9a and first and second discharge ports 9b and 9c on the discharge side. The inlet port 9a is the condenser 7, the first discharge port 9b is the refrigeration throttle device 11 of the refrigeration evaporator 1, and the second discharge port 9c is the refrigeration throttle device 13 of the refrigeration evaporator 3. Communicate.

  The refrigerator for refrigeration 11 is a capillary tube. As shown in FIG. 2, the refrigeration evaporator 1 includes a large number of fins 15, a refrigerant pipe 17 penetrating each fin 15, and a refrigeration fan 19. Air passes between the fins 15 by the refrigeration fan 19. When this is done, heat exchange is performed with the refrigerant flowing in the refrigerant pipe 17 to generate cooling air for cooling the interior.

  On the other hand, the freezing throttle device 13 is a capillary tube. As shown in FIG. 3, the refrigeration evaporator 3 is a combination pipe in which a large number of fins 21, a refrigerant pipe 23 passing through each fin 21, and a part of the outlet side refrigerant pipe 25 of the refrigeration evaporator 1 are arranged in parallel. It has a structure.

  One side of the refrigerant pipe 23 of the refrigeration evaporator 3 is in communication with the compressor 5 via the refrigeration throttle device 13 and the other outlet 23b side through the check valve 26.

  One inlet 25a side of the refrigerant pipe 25 which is a part of the refrigeration evaporator 1 disposed in the refrigeration evaporator 3 which is a combination pipe is the refrigerant pipe 17 of the refrigeration evaporator 1 and the other side. The outlet 25b side communicates with the outlet side refrigerant pipe 33 of the refrigeration evaporator 3 toward the compressor 5, and the refrigeration fan 27 secures the flow of air as shown by the arrows in FIG.

  The diameter from the inlet 25a side to the outlet 25b side of the refrigerant pipe 25 of a part of the refrigeration evaporator 1 arranged in the refrigeration evaporator 3 is from the inlet 23a side to the outlet 23b of the refrigerant pipe 23 of the refrigeration evaporator 3. The diameter is narrower than the diameter to the side.

  The reason why the diameter of the refrigerant pipe 25 in a part of the refrigeration evaporator 1 is made small is a means for suppressing the amount of refrigerant remaining in the refrigerant refrigerant 25 in the refrigeration evaporator 3 to be small. ing. In this case, the means for suppressing the amount of refrigerant remaining in a part of the refrigerant pipe 25 arranged in the refrigeration evaporator 3 is not limited to the above-described means. For example, the length (full length) from the inlet 25a side to the outlet 25b side of the refrigerant pipe 25 of the refrigeration evaporator 1 is the length from the inlet 23a side to the outlet 23b side of the refrigerant pipe 23 of the refrigeration evaporator 3 ( It is good also as a means to hold down the retention amount of the refrigerant | coolant which retains in the one part refrigerant | coolant piping 25 by setting it as a means shorter than (full length).

  In addition, as shown in FIG. 3, the refrigerant pipe 25 of the refrigeration evaporator 1 serving as a combination pipe is arranged on the windward side of the refrigerant pipe 23 of the refrigeration evaporator 3, thereby suppressing the efficiency at the time of heat exchange. It is good also as a means to suppress the retention amount of the refrigerant | coolant which retains in the refrigerant | coolant piping 25 small.

  Also, as shown in FIG. 3, the fin pitch of the fins 29 (distance between the fins) of the refrigerant pipe 25 of the refrigeration evaporator 1 that is a combination pipe is set to the fin of the fin 21 of the refrigerant pipe 23 of the refrigeration evaporator 3. By making it rougher than the pitch, it is possible to suppress the efficiency during heat exchange and to reduce the amount of refrigerant remaining in a part of the refrigerant piping 25.

  Further, as shown in FIG. 4, the fins are eliminated over the entire region of the refrigerant pipe 25 of the refrigeration evaporator 1 that is a combination pipe, thereby suppressing the efficiency during heat exchange and the retention of the refrigerant staying in a part of the refrigerant pipe 25. It is good also as a means to keep quantity small.

  Further, as shown in FIG. 5, a refrigerant pipe 25 of a part of the refrigeration evaporator 1 which is a combination pipe is formed as a grooveless pipe having no groove on the inner surface, and the refrigerant pipe 23 of the refrigeration evaporator 3 is formed in a spiral shape on the inner surface. By using a grooved tube with a groove 31, it is possible to suppress the efficiency at the time of heat exchange and to reduce the amount of refrigerant remaining in a part of the refrigerant pipe 25.

  According to the present invention configured as described above, the refrigerant discharged from the compressor 5 by the switching control of the three-way valve 9 is the condenser 7, the refrigeration throttle device 11, the refrigeration evaporator 1, and the refrigeration evaporator 3. The cooling operation of the refrigerating room can be performed by the first refrigeration cycle (solid line) that passes through a part of the refrigerant and returns to the compressor 5 again. The refrigerant discharged from the compressor 5 by the switching control of the three-way valve 9 passes through the condenser 7, the freezing expansion device 13, the freezing evaporator 3, and returns to the compressor 5 again (dotted line). ) Allows the cooling operation of the freezer to be performed.

  Moreover, the simultaneous cooling operation of a refrigerator compartment and a freezer compartment can be performed with the combination of a 1st and 2nd freezing cycle.

  On the other hand, even when the refrigerant passes through the refrigerant pipe 25 arranged in the refrigeration evaporator 3 during the cooling room cooling operation by the first refrigeration cycle, even if the refrigerant is affected by the low temperature temperature of the refrigeration evaporator 3. Therefore, the amount of the refrigerant staying in the refrigerant pipe 25 is suppressed as much as possible, a suitable amount of refrigerant circulation can be ensured, and an efficient cooling operation can be performed.

DESCRIPTION OF SYMBOLS 1 Refrigerator evaporator 3 Refrigerator evaporator 5 Compressor 7 Condenser 9 3 way valve (switching valve)
9b 1st discharge port 9c 2nd discharge port 25 Refrigerant piping by the side of outlet of refrigerating evaporator 33 Refrigerant piping by the side of outlet of refrigerating evaporator

Claims (6)

A switching valve having a compressor for discharging a refrigerant, a condenser mutually connected to the compressor, and a first discharge port and a second discharge port for switching the flow path or flow rate of the refrigerant from the condenser, the switching with a refrigerating evaporator for cooling the refrigerating compartment is connected to the first discharge port of the valve, and a freezer evaporator for cooling the freezer compartment connected to the second discharge port of the switching valve,
A part of the outlet side refrigerant pipe of the refrigeration evaporator is disposed in the refrigeration evaporator, and the outlet side refrigerant pipe extended outward is connected to the outlet side refrigerant pipe of the refrigeration evaporator toward the compressor. the connection joins are allowed Rutoki, the pipe diameter of the outlet side refrigerant pipe of the refrigerating evaporator disposed in the freezing evaporator, a diameter smaller than the pipe diameter of the refrigerant pipe in said freezer evaporator A refrigerator characterized by that. A switching valve having a compressor for discharging a refrigerant, a condenser mutually connected to the compressor, and a first discharge port and a second discharge port for switching the flow path or flow rate of the refrigerant from the condenser, the switching the first discharge port connected to the refrigerating evaporator for cooling the refrigerating compartment valve, and a freezer evaporator for cooling the second discharge port connected to the freezing chamber of the switching valve,
A part of the outlet side refrigerant pipe of the refrigeration evaporator is disposed in the refrigeration evaporator, and the outlet side refrigerant pipe extended outward is connected to the outlet side refrigerant pipe of the refrigeration evaporator toward the compressor. the connection joins are allowed Rutoki, that the outlet side refrigerant pipe of the refrigerating evaporator disposed in the freezing evaporator, was arranged at a position facing the windward side of the refrigerant pipe in said freezer evaporator Features a refrigerator. A switching valve having a compressor for discharging a refrigerant, a condenser mutually connected to the compressor, and a first discharge port and a second discharge port for switching the flow path or flow rate of the refrigerant from the condenser, the switching with a refrigerating evaporator for cooling the refrigerating compartment is connected to the first discharge port of the valve, and a freezer evaporator for cooling the freezer compartment connected to the second discharge port of the switching valve,
A part of the outlet side refrigerant pipe of the refrigeration evaporator is disposed in the refrigeration evaporator, and the outlet side refrigerant pipe extended outward is connected to the outlet side refrigerant pipe of the refrigeration evaporator toward the compressor. the connection joins are allowed Rutoki, the fin pitch of the fins provided on the refrigerant pipe arranged refrigerating evaporator to the freezing evaporator, the fins provided on the refrigerant pipe in said freezer evaporator A refrigerator characterized by being rougher than the fin pitch . A switching valve having a compressor for discharging a refrigerant, a condenser mutually connected to the compressor, and a first discharge port and a second discharge port for switching the flow path or flow rate of the refrigerant from the condenser, the switching with a refrigerating evaporator for cooling the refrigerating compartment is connected to the first discharge port of the valve, and a freezer evaporator for cooling the freezer compartment connected to the second discharge port of the switching valve,
A part of the outlet side refrigerant pipe of the refrigeration evaporator is disposed in the refrigeration evaporator, and the outlet side refrigerant pipe extended outward is connected to the outlet side refrigerant pipe of the refrigeration evaporator toward the compressor. the connection joins are allowed Rutoki, groove outlet side refrigerant pipe of the refrigerating evaporator disposed in the freezing evaporator, ungrooved no grooves on the inner surface pipe, the refrigerant pipe inner surface in the refrigeration evaporator A refrigerator characterized by having a grooved pipe . The piping total length of the outlet side refrigerant piping of the refrigeration evaporator arranged in the refrigeration evaporator is made shorter than the total piping length of the refrigerant piping in the refrigeration evaporator. The refrigerator in any one of Claims 1 thru | or 4. The refrigerator according to any one of claims 1 to 4, wherein the refrigerant pipe at the outlet side of the refrigeration evaporator disposed in the refrigeration evaporator has no fins over the entire area of the pipe.

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