JP2009085539A

JP2009085539A - Refrigerator

Info

Publication number: JP2009085539A
Application number: JP2007257778A
Authority: JP
Inventors: Jun Yamashita; 潤山下
Original assignee: Toshiba Corp; Toshiba Consumer Electronics Holdings Corp; Toshiba Home Appliances Corp
Current assignee: Toshiba Corp; Toshiba Lifestyle Products and Services Corp
Priority date: 2007-10-01
Filing date: 2007-10-01
Publication date: 2009-04-23

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

本発明は冷凍能力の向上を図った冷蔵庫に関する。 The present invention relates to a refrigerator with improved refrigeration capacity.

一般に冷蔵庫は、圧縮機、凝縮器、絞り装置、蒸発器とを有し、圧縮機から吐出された冷媒は凝縮器、絞り装置、蒸発器を通り、再び圧縮機に戻る冷凍サイクルを構成する。 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.

蒸発器は、冷媒が流れる冷媒管と空気が通過する多数のフィンとで構成され、フィンとフィンの間を通過する空気は冷媒管を流れる冷媒との間で熱交換が行なわれ冷却される。 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.

この冷凍サイクル時の冷媒のモリエル線図を図７に示す。 A Mollier diagram of the refrigerant during this refrigeration cycle is shown in FIG.

モリエル線図は横軸にエンタルピ（Ｋｃａｌ／ｋｇ），と縦軸に圧力（ｋｇ／ｃｍ²）がとられており、飽和液線より左側領域は液体，飽和蒸気線の右側領域は気体，両者の中間領域は液体と気体が混ざり合った２相液で等温線は圧力線と平行となる。 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.

この図で１→２は蒸発器による蒸発領域、２→３は圧縮機による圧縮領域、３→４は凝縮器による凝縮領域、４→１は絞り装置による絞り領域をそれぞれ示している。 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.

前記モリエル線図において１→２は蒸発器による蒸発領域を示すことは前記した通りであるが、１→２の領域Ｄは蒸発器で冷媒が蒸発する際、周囲の空気から奪う熱量を示すところから、この熱量の領域を拡大することで冷凍サイクルの冷却能力アップを図れることがわかる。 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.

そこで、本発明にあっては簡単な工夫によって蒸発器の熱量の領域を拡大することができる冷蔵庫を提供することを目的とする。 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.

前記目的を達成するために、本発明にあっては、圧縮機から吐出された冷媒が凝縮器、絞り装置、蒸発器を通り、再び圧縮機に戻る冷凍サイクルを構成する冷媒回路と、前記凝縮器の出口側と圧縮機の吸込側とをつなぐバイパス回路とを有し、前記バイパス回路は、キャピラリチューブとそのキャピラリチューブによって低温の冷媒が流れる一部領域を備え、その低温の冷媒が流れる前記一部領域を、前記凝縮器の出口温度を下げる熱交換部としたことを特徴とする。 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.

本発明によれば、バイパス回路の熱交換部によって凝縮器の出口温度を下げることができるため、図６に示すように凝縮領域は４→４ａ，蒸発領域は１ａ→１にそれぞれサイクルが変化することで蒸発器の冷却能力、即ち、蒸発器で周りの空気から奪う熱量はＤ＋ｄとなりサイクルが拡大したｄ分、冷却能力の向上を図ることができる。 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.

本発明を実施するにあたって、第１に前記バイパス回路の一部分を熱交換部としたその熱交換領域を、ドレン水受け皿の上方に配置することで、結露した水滴が必ずドレイン水受け皿の上に落下するようにすることが望ましい。 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.

第２に前記バイパス回路のキャピラリチューブを、密のコイル状に巻かれた形状とすることで、低コストで設置場所が小さくて済むようにすることが望ましい。 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.

第３に前記熱交換部を、バイパス回路の低温の冷媒が貯留され、その貯留液内を凝縮器から絞り装置へ向かう冷媒回路の冷媒管が貫通する冷媒貯留部によって構成することで、効率よく凝縮器の出口温度を下げることができるようにすることが望ましい。 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.

第４に前記熱交換部は、凝縮器から絞り装置へ向かう冷媒回路の冷媒管と低温の冷媒が流れるバイパス回路の一部領域とを接触させた接触構造とすることで、コストを低く抑え、効率よく凝縮器の出口温度を下げることができるようにすることが望ましい。 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.

以下、図１乃至図６の図面を参照しながら本発明の一実施形態について具体的に説明する。 Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 6.

図５は本発明にかかる冷蔵庫の概要断面図を示している。 FIG. 5: has shown schematic sectional drawing of the refrigerator concerning this invention.

冷蔵庫１は、庫内温度の異なる冷蔵室３と冷凍室５とに仕切られると共に前面はそれぞれの開閉扉７、９となっている。 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.

冷凍室５の後部には蒸発器１１が配置され、蒸発器１１において熱交換された冷気はファン１３によって直接冷凍室内へ吹出される一方、切替弁１５によって取入れ量が制御された冷気はダクト１７を介して冷蔵室３へ吹出されることで庫内冷却が行なわれるようになっている。 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.

蒸発器１１は図１に示す如く、冷媒回路１９によって圧縮機２１、凝縮器２３、絞り装置２５と連通し、圧縮機２１から吐出された冷媒は凝縮器２３、絞り装置２５、蒸発器１１を通り、再び圧縮機２１に戻る冷凍サイクルを構成する。 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.

一方、冷凍サイクルを構成する冷媒回路１９には前記凝縮器２３の出口側と圧縮機２１の吸込側とをつなぐバイパス回路２７が設けられている。 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.

バイパス回路２７は、キャピラリチューブ２９、３１と熱交換部３３とを有し、前記熱交換部３３の熱交換部領域は図５に示す如くドレイン水受け皿３５の上方に配置された構造となっている。 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.

したがって、熱交換部３３において発生した結露等の水滴は必ずドレイン水受け皿３５の上に落下することで、周囲を水で濡らすことなく確実に排水処理が行えるようになっている。 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.

キャピラリチューブ２９，３１は、前記熱交換部３３を挟んでその上流側と下流側とに配置され冷媒が細いチューブ内を通過する時、その抵抗によって圧力が急激に下がることで下流側領域において低温低圧の冷媒とする。 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.

キャピラリチューブは図４に示す如く密のコイル状に巻かれた形状となっていて、絞り装置となる膨張弁に比べて大幅にコストを抑えることができるようにすると共に冷蔵庫１の機械室３７内に設置するときに、大きな占有スペースを必要とせず、しかも設計値に基づいた長さが確保されるようになっている。 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.

一方、バイパス回路２７に設けられた熱交換部３３は上流側となるキャピラリチューブ２９によって低温低圧の冷媒が流れる領域に設けられている。 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.

図２と図３は熱交換部３３の第１、第２の実施形態を示したものである。 2 and 3 show the first and second embodiments of the heat exchanging section 33. FIG.

図２の熱交換部３３は、バイパス回路２７の低温の冷媒が貯留され、その貯留液内を凝縮器２７から絞り装置２５へ向かう冷媒回路１９の冷媒管１９ａが貫通する冷媒貯留部３９によって構成したものである。 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.

具体的には、冷媒貯留部３９の一方に、切断したバイパス回路２９の一端２９ａを、他方にバイパス回路２９の他方２９ｂをそれぞれ接続し、内部に低温低圧の冷媒が貯まるようにすると共に、その冷媒貯留部３９の内部を凝縮器２３から絞り装置２５へ向かう冷媒回路１９の冷媒管１９ａを貫通させた手段としてある。 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.

これにより、凝縮器２３からの冷媒は冷媒貯留部３９内を通過するときに貯留液との間で熱交換が行なわれ、凝縮器２３の出口温度、即ち、図６において冷媒温度（４→４ａ）を下げることが可能となっている。 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.

図３の前記熱交換部３３は、凝縮器２３から絞り装置２５へ向かう冷媒回路１９の冷媒管１９ａと低温の冷媒が流れるバイパス回路２７の一部領域とをハンダ付け等の手段によって平行に接触させた接触構造としたものである。 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.

これにより、凝縮器２３からの冷媒はバイパス回路２７の一部領域となる接触領域を通過する時に熱交換が行なわれ、凝縮器２３の出口温度、即ち図６において冷媒温度（４→４ａ）を下げることが可能となっている。 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.

この時の冷凍サイクルのモリエル線図を図６に示す。 The Mollier diagram of the refrigeration cycle at this time is shown in FIG.

このモリエル線図によれば、標準の１→２→３→４→１に戻る冷凍サイクルに対して、本発明にあっては１ａ→２→３→４ａ→１ａに戻る冷凍サイクルを構成し、蒸発領域１→２が１ａ→２となり、ｄ領域分拡大したサイクルが得られるようになる。 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.

このように構成された本発明によれば、圧縮機から吐出された冷媒は凝縮器、絞り装置、蒸発器を通り、再び圧縮機に戻る冷凍サイクルを構成する。この時図６に示す如く冷媒は１ａ→２→３→４ａ→１ａ→２となる冷凍サイクルを構成する。 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.

この冷凍サイクル時において、凝縮器２３の出口温度は熱交換部３３によって冷却された４→４ａとなるため、蒸発器１１の冷却能力、即ち、蒸発器で周りの空気から奪う熱量はＤ＋ｄとなり、サイクルが拡大したｄ分、冷却能力が向上するようになる。 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.

本発明にかかる冷蔵庫の冷凍サイクルを構成する冷媒回路図。The refrigerant circuit figure which comprises the refrigerating cycle of the refrigerator concerning this invention. 熱交換部の第１の実施形態を示した概要説明図。BRIEF DESCRIPTION OF THE DRAWINGS Outline explanatory drawing which showed 1st Embodiment of the heat exchange part. 熱交換部の第２の実施形態を示した概要説明図。Outline | summary explanatory drawing which showed 2nd Embodiment of the heat exchange part. キャピラリチューブの概要説明図。Outline explanatory drawing of a capillary tube. 冷蔵庫の概要切断面図。The outline cutaway view of a refrigerator. 本発明にかかるモリエル線図。The Mollier diagram concerning this invention. 従来のモリエル線図。The conventional Mollier diagram.

符号の説明Explanation of symbols

１冷蔵庫
３冷蔵室
５冷凍室
１１蒸発器
１９冷媒回路
１９ａ冷媒管
２１圧縮機
２３凝縮器
２５絞り装置
２７バイパス回路
２９、３１キャピラリチューブ
３３熱交換部
３５ドレイン水受け皿
３９冷媒貯留部 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

圧縮機から吐出された冷媒が凝縮器、絞り装置、蒸発器を通り、再び圧縮機に戻る冷凍サイクルを構成する冷媒回路と、前記凝縮器の出口側と圧縮機の吸込側とをつなぐバイパス回路とを有し、
前記バイパス回路は、キャピラリチューブとそのキャピラリチューブによって低温の冷媒が流れる一部領域を備え、その低温の冷媒が流れる前記一部領域を、前記凝縮器の出口温度を下げる熱交換部としたことを特徴とする冷蔵庫。 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.

前記バイパス回路の一部分を熱交換部としたその熱交換領域を、ドレン水受け皿の上方に配置したことを特徴とする請求項１記載の冷蔵庫。 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.

前記バイパス回路のキャピラリチューブは、密のコイル状に巻かれた形状となっていることを特徴とする請求項１記載の冷蔵庫。 The refrigerator according to claim 1, wherein the capillary tube of the bypass circuit has a shape wound in a dense coil shape.

前記熱交換部は、バイパス回路の低温の冷媒が貯留され、その貯留液内を凝縮器から絞り装置へ向かう冷媒回路の冷媒管が貫通する冷媒貯留部によって構成されていることを特徴とする請求項１記載の冷蔵庫。 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.

前記熱交換部は、凝縮器から絞り装置へ向かう冷媒回路の冷媒管と低温の冷媒が流れるバイパス回路の一部領域とを接触させた接触構造となっていることを特徴とする請求項１記載の冷蔵庫。 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.