JP2009085539A - Refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase a heat quantity by an evaporator and to improve a refrigerating cycle. <P>SOLUTION: A bypass circuit 27 connecting the outlet side of a condenser 23 and the suction side of a compressor 21 is provided in a refrigerant circuit 19 in which a refrigerant discharged from the compressor 21 passes through the condenser 23, a throttle device 25, and the evaporator 11, and returns to the compressor 21. The bypass circuit 27 is provided with a heat exchanging part 33 in one region where a low temperature refrigerant flows by capillary tubes 29, 31. The heat exchanging part 33 performs heat exchange with the refrigerant discharged from the condenser 23, and a temperature at the outlet of the condenser 23 is lowered. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a refrigerator with improved refrigeration capacity.

  Generally, a refrigerator has a compressor, a condenser, a squeezing device, and an evaporator, and the refrigerant discharged from the compressor constitutes a refrigeration cycle that passes through the condenser, the squeezing device, and the evaporator and returns to the compressor.

  The evaporator is composed of a refrigerant pipe through which the refrigerant flows and a large number of fins through which air passes. The air passing between the fins is cooled by heat exchange with the refrigerant flowing through the refrigerant pipe.

  A Mollier diagram of the refrigerant during this refrigeration cycle is shown in FIG.

The Mollier diagram shows enthalpy (Kcal / kg) on the horizontal axis and pressure (kg / cm ² ) on the vertical axis. The left side of the saturated liquid line is liquid, the right side of the saturated vapor line is gas, The intermediate region is a two-phase liquid in which liquid and gas are mixed, and the isotherm is parallel to the pressure line.

  In this figure, 1 → 2 indicates the evaporation region by the evaporator, 2 → 3 indicates the compression region by the compressor, 3 → 4 indicates the condensation region by the condenser, and 4 → 1 indicates the expansion region by the expansion device.

  In the Mollier diagram, 1 → 2 indicates the evaporation region by the evaporator as described above, but the region D of 1 → 2 indicates the amount of heat taken from the surrounding air when the refrigerant evaporates in the evaporator. Thus, it can be seen that the cooling capacity of the refrigeration cycle can be increased by expanding the region of the heat quantity.

  Then, in this invention, it aims at providing the refrigerator which can expand the area | region of the calorie | heat amount of an evaporator by simple contrivance.

  In order to achieve the above object, according to the present invention, the refrigerant discharged from the compressor passes through the condenser, the expansion device, and the evaporator, and constitutes a refrigeration cycle that returns to the compressor again, and the condensation A bypass circuit connecting the outlet side of the compressor and the suction side of the compressor, the bypass circuit includes a capillary tube and a partial region through which the low-temperature refrigerant flows, and the low-temperature refrigerant flows through the capillary tube. The partial area is a heat exchange part that lowers the outlet temperature of the condenser.

  According to the present invention, the outlet temperature of the condenser can be lowered by the heat exchange part of the bypass circuit, so that the cycle changes from 4 to 4a in the condensation region and 1a to 1 in the evaporation region as shown in FIG. Thus, the cooling capacity of the evaporator, that is, the amount of heat taken away from the surrounding air by the evaporator becomes D + d, and the cooling capacity can be improved by d, which is the cycle expanded.

  In practicing the present invention, firstly, the heat exchange region having a part of the bypass circuit as a heat exchanging portion is arranged above the drain water tray, so that the condensed water drops always fall on the drain water tray. It is desirable to do so.

  Secondly, it is desirable that the capillary tube of the bypass circuit is formed in a shape wound in a dense coil shape so that the installation location can be reduced at low cost.

  Thirdly, the heat exchanging section is configured by a refrigerant storing section in which the low-temperature refrigerant in the bypass circuit is stored and the stored liquid passes through the refrigerant pipe of the refrigerant circuit from the condenser to the expansion device. It is desirable to be able to reduce the outlet temperature of the condenser.

  Fourthly, the heat exchanging part has a contact structure in which the refrigerant pipe of the refrigerant circuit heading from the condenser to the expansion device and a partial region of the bypass circuit through which the low-temperature refrigerant flows, thereby reducing the cost. It is desirable to be able to lower the condenser outlet temperature efficiently.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 6.

  FIG. 5: has shown schematic sectional drawing of the refrigerator concerning this invention.

  The refrigerator 1 is partitioned into a refrigerator compartment 3 and a freezer compartment 5 having different interior temperatures, and the front faces are the open / close doors 7 and 9, respectively.

  An evaporator 11 is disposed at the rear of the freezer compartment 5, and the cool air heat-exchanged in the evaporator 11 is blown directly into the freezer compartment by the fan 13, while the cool air whose intake amount is controlled by the switching valve 15 is duct 17. The inside is cooled by being blown out to the refrigerator compartment 3 via the.

  As shown in FIG. 1, the evaporator 11 communicates with the compressor 21, the condenser 23, and the expansion device 25 by the refrigerant circuit 19, and the refrigerant discharged from the compressor 21 passes through the condenser 23, the expansion device 25, and the evaporator 11. Thus, a refrigeration cycle returning to the compressor 21 is configured.

  On the other hand, the refrigerant circuit 19 constituting the refrigeration cycle is provided with a bypass circuit 27 that connects the outlet side of the condenser 23 and the suction side of the compressor 21.

  The bypass circuit 27 has capillary tubes 29 and 31 and a heat exchanging portion 33, and the heat exchanging region of the heat exchanging portion 33 is arranged above the drain water receiving tray 35 as shown in FIG. Yes.

  Therefore, water droplets such as dew condensation generated in the heat exchanging section 33 always fall on the drain water receiving tray 35, so that the drainage treatment can be performed reliably without getting the surroundings wet with water.

  The capillary tubes 29 and 31 are arranged on the upstream side and the downstream side of the heat exchanging unit 33, and when the refrigerant passes through the thin tube, the pressure rapidly decreases due to the resistance, so that the temperature is low in the downstream region. Use a low-pressure refrigerant.

  As shown in FIG. 4, the capillary tube has a shape wound in a dense coil shape, so that the cost can be significantly reduced as compared with an expansion valve serving as a throttling device, and in the machine room 37 of the refrigerator 1. When installed in the housing, a large occupation space is not required, and a length based on the design value is secured.

  On the other hand, the heat exchanging portion 33 provided in the bypass circuit 27 is provided in the region where the low-temperature and low-pressure refrigerant flows by the capillary tube 29 on the upstream side.

  2 and 3 show the first and second embodiments of the heat exchanging section 33. FIG.

  The heat exchanging unit 33 in FIG. 2 includes a refrigerant storage unit 39 in which the low-temperature refrigerant in the bypass circuit 27 is stored, and the refrigerant pipe 19a of the refrigerant circuit 19 that goes from the condenser 27 to the expansion device 25 passes through the stored liquid. It is a thing.

  Specifically, one end 29a of the bypass circuit 29 is connected to one side of the refrigerant storage section 39, and the other side 29b of the bypass circuit 29 is connected to the other side so that low-temperature and low-pressure refrigerant can be stored therein, and The inside of the refrigerant reservoir 39 is a means that penetrates the refrigerant pipe 19 a of the refrigerant circuit 19 that goes from the condenser 23 to the expansion device 25.

  Thereby, when the refrigerant from the condenser 23 passes through the refrigerant reservoir 39, heat exchange is performed between the refrigerant and the stored liquid, and the outlet temperature of the condenser 23, that is, the refrigerant temperature (4 → 4a) in FIG. ) Can be lowered.

  The heat exchanging unit 33 in FIG. 3 contacts the refrigerant pipe 19a of the refrigerant circuit 19 from the condenser 23 toward the expansion device 25 in parallel with a partial region of the bypass circuit 27 through which a low-temperature refrigerant flows by means such as soldering. This is a contact structure.

  Thus, heat exchange is performed when the refrigerant from the condenser 23 passes through a contact region which is a partial region of the bypass circuit 27, and the outlet temperature of the condenser 23, that is, the refrigerant temperature (4 → 4a) in FIG. It is possible to lower.

  The Mollier diagram of the refrigeration cycle at this time is shown in FIG.

  According to this Mollier diagram, in the present invention, a refrigeration cycle returning to 1a → 2 → 3 → 4a → 1a is constituted in contrast to the standard 1 → 2 → 3 → 4 → 1 refrigeration cycle. The evaporation area 1 → 2 becomes 1a → 2, and a cycle enlarged by the d area can be obtained.

  According to the present invention configured as described above, the refrigerant discharged from the compressor constitutes a refrigeration cycle that passes through the condenser, the expansion device, and the evaporator and returns to the compressor again. At this time, as shown in FIG. 6, the refrigerant constitutes a refrigeration cycle of 1a → 2 → 3 → 4a → 1a → 2.

  In this refrigeration cycle, the outlet temperature of the condenser 23 becomes 4 → 4a cooled by the heat exchanging unit 33, so the cooling capacity of the evaporator 11, that is, the amount of heat taken away from the surrounding air by the evaporator becomes D + d, The cooling capacity is improved by d, which is the cycle expanded.

The refrigerant circuit figure which comprises the refrigerating cycle of the refrigerator concerning this invention. BRIEF DESCRIPTION OF THE DRAWINGS Outline explanatory drawing which showed 1st Embodiment of the heat exchange part. Outline | summary explanatory drawing which showed 2nd Embodiment of the heat exchange part. Outline explanatory drawing of a capillary tube. The outline cutaway view of a refrigerator. The Mollier diagram concerning this invention. The conventional Mollier diagram.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Refrigerator 3 Refrigerating room 5 Freezer room 11 Evaporator 19 Refrigerant circuit 19a Refrigerant pipe 21 Compressor 23 Condenser 25 Throttle device 27 Bypass circuit 29, 31 Capillary tube 33 Heat exchange part 35 Drain water receiving tray 39 Refrigerant storage part

Claims (5)

A refrigerant circuit constituting a refrigeration cycle in which refrigerant discharged from the compressor passes through the condenser, expansion device, and evaporator and returns to the compressor again, and a bypass circuit that connects the outlet side of the condenser and the suction side of the compressor And
The bypass circuit includes a capillary tube and a partial region through which the low-temperature refrigerant flows, and the partial region through which the low-temperature refrigerant flows serves as a heat exchange unit that lowers the outlet temperature of the condenser. Features a refrigerator.   The refrigerator according to claim 1, wherein the heat exchange region having a part of the bypass circuit as a heat exchange part is disposed above the drain water tray.   The refrigerator according to claim 1, wherein the capillary tube of the bypass circuit has a shape wound in a dense coil shape.   The heat exchanging part is configured by a refrigerant storing part in which a low-temperature refrigerant in a bypass circuit is stored, and a refrigerant pipe of a refrigerant circuit passing from the condenser to the expansion device passes through the stored liquid. Item 10. The refrigerator according to Item 1.   The heat exchange section has a contact structure in which a refrigerant pipe of a refrigerant circuit heading from a condenser to a throttle device and a partial region of a bypass circuit through which a low-temperature refrigerant flows are in contact with each other. Refrigerator.

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