JP2016050750A - Refrigeration cycle device and refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigeration cycle device which inhibits liquid back with a simple structure, and to provide a refrigerator.SOLUTION: In a refrigeration cycle device 20, a compressor 9 disposed in a machine room 8, a condenser 24, throttle devices 34, 40, and coolers 4, 5 are connected by pipes. A suction pipe 48 connecting the coolers 4, 5 with the compressor 9 is disposed to conduct heat exchange with a high temperature side refrigerant pipe 22 in the machine room 8.SELECTED DRAWING: Figure 2

Description

  Embodiments described herein relate generally to a refrigeration cycle apparatus and a refrigerator.

  A refrigeration cycle apparatus used for a refrigerator, an air conditioner, or the like is configured by sequentially connecting a compressor, a condenser, a throttling device, and a cooler disposed in a machine room by a refrigerant pipe. In the refrigeration cycle apparatus, the refrigerant sealed in the cycle is compressed by the compressor and changed into a high-temperature and high-pressure gaseous refrigerant, and then flows into the condenser and becomes a liquid refrigerant while dissipating heat. The liquid refrigerant is decompressed by a throttling device, and then vaporized by a cooler to take heat away from the surroundings to cool the cooler. The refrigerant that has cooled the cooler returns to the compressor via the suction pipe, is compressed again, becomes a high-temperature and high-pressure gaseous refrigerant, and continues the circulation described above in the cycle.

  In such a refrigeration cycle apparatus, when a phenomenon called a liquid back in which low-temperature liquid refrigerant that could not be evaporated by the cooler flows through the suction pipe and is sucked into the compressor occurs, the pressure in the compressor rises abnormally, and the compressor The flow rate of the refrigerant flowing in the cycle can be adjusted by controlling the number of rotations of the compressor and the opening of the adjusting valve provided in the cycle. Measures have been taken to prevent liquid back (see, for example, Patent Document 1 below).

  In addition, since a refrigerant having a temperature lower than the temperature in the machine room in which the compressor is disposed flows through the suction pipe, dew condensation water is generated on the surface of the suction pipe and falls down into the machine room, which may cause water leakage ( For example, see Patent Document 2 below).

JP 2002-277067 A JP 2011-242083 A

  However, in order to prevent liquid back by adjusting the flow rate of the refrigerant flowing in the cycle, in addition to making the control configuration complicated, in order to prevent liquid refrigerant from flowing out of the cooler in all operating situations The amount of refrigerant supplied to the cooler needs to be reduced to a superheat state, and cooling efficiency may deteriorate.

  Then, it aims at providing the refrigerating-cycle apparatus and refrigerator which can suppress generation | occurrence | production of a liquid back with simple structure.

  A refrigeration cycle apparatus according to an embodiment is a refrigeration cycle apparatus in which a compressor, a condenser, a throttling device, and a cooler arranged in a machine room are connected by piping, and the cooler and the compressor are connected. The suction pipe is arranged so as to be able to exchange heat with the high-temperature side refrigerant pipe in the machine room.

It is a longitudinal section of the refrigerator concerning a 1st embodiment of the present invention. It is a block diagram which shows the refrigerating cycle apparatus of the refrigerator of FIG. It is sectional drawing of the machine room seen from the back surface. It is sectional drawing of the machine room seen from the back in the refrigerator of the example of a change.

  Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the refrigerator 1 according to the present embodiment has a storage space inside a cabinet 1a in which a heat insulating material is provided in a heat insulating space formed between a steel plate outer box and a synthetic resin inner box. And the interior of the storage space is cooled by the refrigeration cycle apparatus 20 incorporated in the cabinet 1a. The interior of the storage space of the refrigerator 1 is divided into a refrigerator compartment 2 such as a refrigerator compartment or a vegetable compartment and a refrigerator compartment 3 such as a freezer compartment or an ice making compartment by a partition wall.

  At the rear of the storage space, a refrigeration cooler 4 for cooling the refrigerated storage room 2, a refrigeration fan 6 for circulating the cold air in the refrigerated storage room 2, and a refrigeration cooler for cooling the frozen storage room 3 5 and a refrigeration fan 7 for circulating cold air in the refrigerated storage chamber 3 is provided. Each storage chamber is cooled and held at a predetermined set temperature by the refrigeration cooler 4 and the refrigeration cooler 5, and the refrigeration fan 6 and the refrigeration fan 7, respectively. Cooled by the refrigerant supplied from the compressor 9 installed in the machine room 8.

  As shown in FIG. 2, the refrigeration cycle apparatus 20 incorporated in the cabinet 1 a of the refrigerator 1 includes a delivery pipe (evaporation pipe) 22 and a condenser 24 in order from the discharge side of the compressor 9 that discharges high-temperature and high-pressure refrigerant gas. The inlet side of the heat radiating pipe 26, the dew proof pipe 28, the dryer 30 and the three-way valve 32 is connected by a refrigerant pipe. The delivery pipe 22, the heat radiating pipe 26, the dew proof pipe 28, and the refrigerant pipe connecting the dryer 30 and the inlet side of the three-way valve 32 are liquids before the refrigerant is depressurized by the refrigerated capillary tube 34 or the frozen capillary tube 40. It constitutes a part of the high temperature side refrigerant pipe through which the refrigerant flows.

  To one outlet of the three-way valve 32, a refrigerated capillary tube 34 as a throttling device, a refrigerated cooler 4, a refrigerated accumulator 36, and a refrigerated suction pipe 38 are sequentially connected by a refrigerant pipe. To the other outlet of the three-way valve 32, a refrigeration capillary tube 40 as a throttling device, a refrigeration cooler 5, a refrigeration accumulator 42, and a refrigeration suction pipe 44 are sequentially connected by a refrigerant pipe.

  The refrigerated suction pipe 38 and the frozen suction pipe 44 enter the machine room 8 from the ceiling surface of the machine room 8 through the heat insulating space from the inside of the cabinet 1 a, and one suction is carried out by the mixer 46 in the machine room 8. A pipe 48 is connected to the suction side of the compressor 9. Reference numeral 50 is a check valve provided in the frozen suction pipe 44.

  The suction pipe 48 is connected to a high-temperature side refrigerant pipe disposed in the machine chamber 8 such as the delivery pipe 22 by a connecting member 52. For example, a metal plate sandwiches the suction pipe 48 and the delivery pipe 22 integrally with the connection member 52 so that the suction pipe 48 and the delivery pipe 22 are connected in a heat exchangeable manner. The suction pipe 48 and the delivery pipe 22 that are sandwiched are arranged so that the suction pipe 48 is positioned below the delivery pipe 22.

  The three-way valve 32 is a switching valve that switches the flow path so that the refrigerant liquefied by the condenser 24 is alternately supplied to the refrigeration cooler 4 and the refrigeration cooler 5. Switching between the state of the refrigeration cooling operation in which the refrigerant is supplied to the refrigeration cooler 4 and the state of the refrigeration cooling operation in which the refrigerant is supplied to the refrigeration cooler 5 via the refrigeration capillary tube 40 without being supplied to the refrigeration cooler 4 is performed.

  In such a refrigeration cycle apparatus 20, the refrigerant sealed in the cycle is compressed by the compressor 9 to be changed into a high-temperature and high-pressure gaseous refrigerant, flows into the condenser 24 through the delivery pipe 22, and is condensed while dissipating heat. Flows through the vessel 24, the heat radiating pipe 26 and the dew proof pipe 28.

  The liquid refrigerant that has flowed through the condenser 24, the heat radiation pipe 26, and the dew prevention pipe 28 is sent to the refrigerated capillary tube 34 or the frozen capillary tube 40 by the three-way valve 32 so that the capillary tubes 34, 40 are easily vaporized. After the pressure is reduced, vaporization is performed in the refrigeration cooler 4 or the refrigeration cooler 5, and heat is taken from the surroundings to cool the refrigeration cooler 4 and the refrigeration cooler 5, thereby generating cold air. The refrigerant that has flowed through the refrigeration cooler 4 and the refrigeration cooler 5 flows to the accumulators 36 and 42, respectively. In each of the accumulators 36 and 42, the gas-liquid mixture refrigerant is changed into a gaseous refrigerant and a liquid refrigerant, respectively. After separation, the gaseous refrigerant passes through the suction pipes 38 and 44 and joins in the mixer 46, then flows through the suction pipe 48, returns to the compressor 9, and is compressed again to become a high-temperature and high-pressure gaseous refrigerant.

  In the present embodiment as described above, the suction pipe 48 connecting the refrigeration cooler 4 and the refrigeration cooler 5 and the compressor 9 is disposed in the machine room 8 so as to be able to exchange heat with a high-temperature side refrigerant pipe such as the delivery pipe 22. Since the suction pipe 48 is heated by the heat of the high-temperature side refrigerant pipe, it is possible to suppress dew condensation that occurs on the surface of the suction pipe 48, and in the unlikely event that the coolers 4 and 5 cannot evaporate completely. Even if the liquid refrigerant flows into the suction pipe 48, the liquid refrigerant is not vaporized by receiving heat from the high-temperature side refrigerant pipe, and the liquid refrigerant is not sucked into the compressor 9.

  In the present embodiment, the suction pipe 48 is connected to the delivery pipe 22 via the connecting member 52 so as to be capable of exchanging heat. Therefore, the piping work of the delivery pipe 22 and the suction pipe 48 is facilitated in the machine room 8.

  In the above-described embodiment, the suction pipe 48 is heat-exchanged with the high-temperature side refrigerant pipe via the connecting member 52. For example, as shown in FIG. 4, the suction pipe 48 is brazed to the high-temperature side refrigerant pipe. Or by winding and fixing a tape-like cushioning material such as butyl rubber tape in a state where the suction pipe 48 is in contact with the high temperature side refrigerant pipe, the suction pipe 48 is heat exchanged with the high temperature side refrigerant pipe. Also good.

  In the above-described embodiment, the suction pipe 48 provided on the downstream side of the mixer 46 is heat-exchanged with the high-temperature side refrigerant pipe, but the refrigerated suction pipe 38 and the refrigeration suction provided on the upstream side of the mixer 46 are used. The pipe 44 may exchange heat with the high-temperature side refrigerant pipe. In that case, the refrigerated suction pipe 38 is more likely to flow in the low-temperature liquid refrigerant that could not be evaporated by the cooler than the frozen suction pipe 44. It is preferable that the refrigerated suction pipe 38 is prioritized over the heat exchange with the high temperature side refrigerant pipe.

  In the above-described embodiment, the case where the refrigeration cycle apparatus 20 includes two coolers 4 and 5 has been described. Similarly, in the case of a refrigeration cycle apparatus including one cooler, an outlet of the cooler is provided in the machine room. The suction pipe connected to the suction side of the compressor and the suction side of the compressor is arranged on the surface of the suction pipe by arranging heat exchange with the high-temperature refrigerant pipe through which the high-temperature liquid refrigerant flows before the refrigerant is depressurized in the capillary tube. Condensation can be suppressed and liquid refrigerant can be prevented from being sucked into the compressor.

  Further, since the high-temperature refrigerant pipe is located above the suction pipe 48, the air around the high-temperature refrigerant pipe whose temperature has risen moves upward without the suction pipe 48, so the refrigerant in the suction pipe 48 becomes high temperature. It can be prevented from passing.

  In order to further increase the temperature of the suction pipe 48, the high-temperature refrigerant pipe is positioned below the suction pipe 48 so that the increased temperature around the high-temperature refrigerant pipe is positively brought into contact with the suction pipe. Also good.

  Further, the positional relationship between the suction pipe 48 and the high-temperature refrigerant pipe is not limited to the vertical direction, and may be arranged side by side in the horizontal direction. According to this, since the suction pipe 48 and the high-temperature refrigerant pipe can be brought close to each other in a desired positional relationship, the machine room 8 can be reduced in size by effectively utilizing the limited space in the machine room 8, The internal volume can be enlarged.

  In the above-described embodiment, the case where the refrigeration cycle apparatus is applied to a household refrigerator has been described. However, the present invention is not limited thereto, and other apparatuses such as a commercial refrigerator, a refrigeration warehouse, a vending machine, and an air conditioner are used. Application to is possible.

  As mentioned above, although embodiment of this invention was described, these embodiment was shown as an example and is not intending limiting the range of invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the invention described in the claims and equivalents thereof as well as included in the scope and gist of the invention.

DESCRIPTION OF SYMBOLS 1 ... Refrigerator, 1a ... Cabinet, 4 ... Refrigeration cooler, 5 ... Refrigeration cooler, 8 ... Machine room, 9 ... Compressor, 20 ... Refrigeration cycle, 22 ... Delivery pipe, 24 ... Condenser, 26 ... Radiation pipe, 28 Dew prevention pipe, 30 ... Dryer, 32 ... Three-way valve, 34 ... Refrigerated capillary tube, 36 ... Refrigerated accumulator, 38 ... Refrigerated suction pipe, 40 ... Refrigerated capillary tube, 42 ... Refrigerated accumulator, 44 ... Refrigerated suction pipe, 46 ... Mixer 48 ... Suction pipe 50 ... Check valve 52 ... Connecting member

Claims (4)

  In a refrigeration cycle apparatus in which a compressor, a condenser, a throttling device, and a cooler disposed in a machine room are connected by piping, a suction pipe that connects the cooler and the compressor is disposed in the machine room. A refrigeration cycle device arranged to be able to exchange heat with a high-temperature refrigerant pipe. A connecting member that connects the suction pipe and the high-temperature side refrigerant pipe;
The refrigeration cycle apparatus according to claim 1, wherein the suction pipe exchanges heat with the high-temperature side refrigerant pipe via the connecting member.   The refrigeration cycle apparatus according to claim 1, wherein the suction pipe contacts the high temperature side refrigerant pipe and exchanges heat with the high temperature side refrigerant pipe.   In a refrigerator provided with a refrigeration cycle device in which a compressor, a condenser, a throttling device, and a cooler are connected by piping in a machine room, a suction pipe that connects the cooler and the compressor, The refrigerator arrange | positioned so that heat exchange with a high temperature side refrigerant | coolant pipe is possible in the said machine room.

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