JP2007046865A - Refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerator capable of reducing a machine room space to expand a storage volume in the refrigerator by that portion and of air-cooling the inside of the machine room even when supply of the outside air by a heat radiation fan is cut off. <P>SOLUTION: This refrigerator is provided with: a refrigerant compressor 12 arranged by bringing it close to one side in the width direction in the machine room 15 formed in a lower part of a back face of a refrigerator body 1; a condenser 13 arranged at a place higher than the refrigerant compressor 12 along a back wall on the other side in the width direction of the machine room 15; and the heat radiation fan 18 arranged oppositely to the condenser 13. The refrigerator is so structured that: suction openings 21 for sucking air by the heat radiation fan 18 are formed in a bottom part of the refrigerator body 1; lower ventilation openings 25 and upper ventilation openings 28 are formed at a position facing to the refrigerant compressor 12 and at a position facing to the condenser 13, respectively; and, when supply of air from the suction openings 21 is cut off, the air sucked from the lower ventilation openings 28 is run to the compressor 12 and the condenser 13 by natural convection and discharged from the upper ventilation openings 25. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a refrigerator in which a machine room is made compact by improving the arrangement configuration of a refrigerant compressor, a condenser, and the like.

  In recent years, general refrigerators for home use have been remarkably increased in size, and the external size is in a limit state in terms of kitchen space. Therefore, measures to further expand the storage capacity include reducing the heat insulation thickness with a material with high heat insulation performance such as a vacuum heat insulation panel, increasing the internal volume of the compartment, and improving the internal and external component layout. Various measures such as reducing dead space have been studied.

Also in this patent applicant, as shown in FIG.15 and FIG.16, the refrigerant | coolant compressor 102 is put near one side of the width direction in the machine room 105 formed in the back lower part of the refrigerator main body 101, and a storage chamber is cooled. The cooler 109 is disposed on the inner side above the compressor 102 and on the opposite side of the compressor in the width direction, and the condenser 103 is installed in a flat plate shape on the bottom surface of the main body. By disposing the control power supply board 107 in the other wide space of the compressor in the width direction in the machine room 105 and changing the arrangement relationship and structure of the cooler 109, the compressor 102, the condenser 103, and the control power supply board 107. Have applied for a refrigerator that can reduce the thermal loss of the cooler 109, improve the heat insulation efficiency, and increase the heat dissipation efficiency of the machine room 105 and the condenser 103 to obtain a power saving effect (special feature). References 1).
JP 2005-98559 A

  However, in the configuration of Patent Document 1 described above, the flat plate condenser 103 is arranged over almost the entire bottom surface of the main body in order to increase the heat radiation area. However, a portion that does not exchange heat is generated in the condenser 103. Furthermore, there is a problem that the heat temperature is insufficient due to insufficient heat exchange, resulting in a decrease in heat insulation performance in the cabinet, and because the capacity of the condenser itself is large, the occupied space becomes large. There was a drawback that the cost of parts was high.

  On the other hand, the heat radiating fan 108 is installed in the machine room 105 adjacent to the compressor 102 so as to have an axial flow in the width direction of the main body. Therefore, the depth and height of the heat radiating fan 108 and the fan casing 110 are determined. Therefore, the machine room space is not reduced, and the contribution to the expansion of the effective volume in the warehouse is low.

  As another conventional example, there is a configuration in which the condenser is housed in the machine room together with the compressor and the heat radiating fan. In this case, the evaporating dish must be installed on the top of the compressor due to space constraints. As a result, the height dimension of the machine room is increased, and the machine room space has not been reduced.

  In addition, the suction port for taking outside air into the inside of the machine room is usually disposed in a place where it is difficult to clean, such as the bottom surface or the back surface of the refrigerator main body, and may be left uncleaned for a long time. In such a case, there is a problem that a large amount of dust accumulates at the suction port, the supply of outside air is interrupted, and heat dissipation from the condenser or the like is hindered, resulting in a significant reduction in refrigeration power.

  The present invention has been made in consideration of the above circumstances, and by improving the arrangement structure in the machine room such as the refrigerant compressor, the heat radiating fan, and the condenser, the heat radiation efficiency in the machine room can be improved and the machine room can be improved. When the installed parts are installed compactly to save space in the machine room, the storage capacity in the compartment is expanded, and the intake port that takes outside air into the machine room is clogged. Even so, an object of the present invention is to provide a refrigerator capable of cooling charging parts such as a condenser disposed in the machine room by natural convection of outside air in the machine room.

  The refrigerator of the present invention includes a machine room formed at the lower back of the refrigerator main body, a refrigerant compressor arranged close to one side in the width direction of the machine room, and the width of the machine room at a position higher than the refrigerant compressor. A condenser disposed along the back wall on the other side of the direction, and a heat dissipating fan disposed so that the axial flow is in the front-rear direction of the main body facing the condenser, and the heat dissipating fan is provided at the bottom of the refrigerator main body. A suction port for sucking air is formed inside the machine room, and a lower vent is formed at a position facing the refrigerant compressor and an upper vent is formed at a position facing the condenser on the rear wall of the machine room. When the supply of air from the suction port is shut off, the air sucked from the lower vent is blown to the compressor and the condenser and discharged from the upper vent by natural convection. Features.

  The efficient layout of the parts arranged in the machine room can reduce the space in the machine room and improve the heat dissipation efficiency of the compressor and condenser. A high refrigerator can be obtained. Also, on the back wall of the machine room, a lower vent is formed at a position facing the refrigerant compressor, and an upper vent is formed at a position facing the condenser, so that external air can be supplied from the suction port due to dust adhesion or the like. Even if the air is blocked, air can be circulated inside the machine room so that outside air is sucked in from the lower vent and discharged from the upper vent by natural convection, and parts such as a condenser arranged in the machine room The cooling of the refrigeration power can be prevented by cooling.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The refrigerator main body 1 which shows the longitudinal cross-sectional view in FIG. 1, and the perspective view of the machine room part from the back part in FIG. 2, forms a storage space by the inner box 4 provided on the inner surface of the outer box 2 via the heat insulating wall 3, It is divided into a plurality of storage rooms such as a refrigerator compartment 5, a vegetable compartment 6, and a freezer compartment 7 by a partition wall.

  Each storage room is cooled and held at a predetermined set temperature by a refrigeration cooler 8, a refrigeration cooler 9, and fans 10, 11 arranged for each refrigeration space or refrigeration space. 9 is supplied with refrigerant by the operation of a refrigeration cycle including the compressor 12 and the condenser 13.

  The compressor 12 in the refrigeration cycle is installed in a machine room 15 formed at the lower back of the refrigerator main body 1 and is attached to a compressor base 16 provided over the width direction of the main body via a cushion body. Yes.

  The condenser 13 receives the high-temperature and high-pressure refrigerant gas from the compressor 12 to dissipate and condense, and the refrigerant from the condenser 13 is refrigerated cooling in each storage chamber via a capillary tube that is a decompression tube. The storage chamber is supplied to the cooler 8 or the freezing cooler 9 and evaporated to cool the storage chamber to a predetermined air temperature, and is erected on the back of the machine chamber 15.

  Thus, as shown in the longitudinal sectional view of the main part in FIG. 3 and the transverse sectional view of the lower compressor 12 portion in FIG. 4, the machine room 15 has a stepped portion protruding toward the freezer compartment 7 at the lower back of the main body. 17, and a space having a predetermined depth and height dimension in the width direction is formed by the stepped portion 17, and the refrigerant compressor 12 is brought close to one side in the width direction of the machine room 15 space. , And the other wide space side from the compressor as a heat radiating duct, a heat radiating fan 18 for introducing outside air into the machine room 15 and a condenser 13, an evaporating dish 19 for evaporating defrost water, and the like are provided.

  As shown in FIG. 5, the heat radiating fan 18 is attached to the bell mouth portion 20 a of the fan casing 20, and is arranged so that the axial flow is in the front-rear direction of the machine room 15. Specifically, the fan casing 20 has a lower end fixed to the compressor base 16 and an upper end fixed to the rear end of the stepped portion 17, thereby forming a slight gap S <b> 1 with the stepped portion 17. The peripheral edge is disposed so as to contact the stepped portion 17. More specifically, as shown in FIGS. 6 and 7, the fan casing 20 is configured to insert slide hooks 20 b formed at lower ends on both sides thereof into engagement holes 30 formed in the compressor base 16, thereby The lower end is fixed by sliding backward, and the upper end is fixed by screwing the locking portion 20c extending rearward from the upper end portion of the fan casing 20 to the rear end of the stepped portion 17. . With such a fixed configuration, in addition to being simple and excellent in workability, the fan casing 20 is pressed rearward by the stepped portion 17 in a state in which the refrigerator main body 1 is incorporated. Can be fixed.

  The compressor base 16 in front of the lower end of the fan casing 20 is provided with a suction port 21 for outside air having a plurality of openings over the width of the fan casing 20. A condenser 13 formed in the shape of a flat plate having a plurality of layers is disposed behind the heat radiating fan 18. The condenser 13 has a lower end opposed to the heat radiating fan 18 and an upper portion extending upward from the machine chamber 15. And is erected along the recess 22 formed in the outer box rear plate 2a.

  As shown in FIG. 5, the condenser 13 is welded by interposing an air guide plate 13 b formed of a good heat conductor such as a steel plate between refrigerant pipes 13 a meandering in a plurality of layers. In the air guide plate 13b, an opening 13c serving as an air circulation port along the refrigerant pipe 13a is formed by being cut and raised, and the cut and raised pieces are inclinedly disposed on both sides of the plate body so as to guide the wind direction. A piece 13d that guides the air flow from the heat radiating fan 18 upward as indicated by an arrow to promote heat exchange operation of the refrigerant pipe 13a and at the same time acts as a heat radiating plate because the air guide plate 13b itself is also a heat conductor. It is.

  At this time, in the ventilation of the heat radiating fan 18 to the condenser 13, the upstream side of the ventilation and the downstream side of the refrigerant flow in the condenser 13 are made to be close to each other, and the downstream side of the ventilation and the refrigerant of the condenser in order. Heat is exchanged with the upstream side of the flow. In other words, when the meandering refrigerant pipes 13a are arranged in two layers, it is more effective by arranging the refrigerant pipes 13a so that the downstream side of the refrigerant flow in the refrigerant pipe 13a having a relatively low temperature is located closer to the heat radiating fan 18. Cooling performance can be obtained, and the upper and lower positions may be arranged such that the high-temperature refrigerant side is at a higher position.

  The condenser configuration is not limited to the above, and a well-known wire capacitor in which heat-dissipating wires are welded on both sides of a meandering refrigerant pipe may be erected in multiple layers. These may be arranged in combination.

  An evaporating dish 19 that receives defrosted water from the coolers 8 and 9 and evaporates is disposed on the compressor base 16 below the heat radiating fan 18 and the condenser 13. A discharge pipe 26 extends from the compressor 12 inside the evaporating dish 19, and the defrost water is evaporated by high-temperature refrigerant heat by immersing the discharge pipe 26 in the stored defrost water. It is configured.

  As shown in FIGS. 7 and 8, the evaporating dish 19 is configured such that the elastic hook 34 provided at the front end is engaged with the suction port 21, and the rear end of the evaporating dish 19 is screwed to provide a compressor base. It is fixed at 16 predetermined positions. More specifically, as shown in FIG. 9, a substantially L-shaped elastic hook 34 is integrally extended at the front end portion of the evaporating dish 19, and a protrusion 34 a provided at the tip of the elastic hook 34 and By engaging the suction port 21, the front part of the evaporating dish 19 is fixed to the compressor base 16. And in the state which fixed the front part of the evaporating dish 19, the collar part 36 and the rear end of the evaporating dish 19 which protruded upwards from the rear end of the compression stand 16 are fixed with the screw | thread 38 from the outer side of the refrigerator main body 1. FIG. . By fixing the screw from the outside in this way, the evaporating dish 19 is pulled backward, and the protrusion 34 a is urged backward by the elasticity of the elastic hook 34.

  By fixing the evaporating dish 19 to the comp base 16 in this way, the assembling work is facilitated, and the evaporating dish 19 is firmly fixed to the comp base 16 without rattling by the elastic force exerted by the elastic hook 34. Therefore, it is possible to reduce the contact sound with the fan casing 20 and the compressor base 16 generated by the vibration of the heat radiating fan 18 and the compressor 12.

  In addition, as shown in FIG. 2, a recess 22 on the rear plate located above the compressor 12 adjacent to the condenser 13 has a power supply circuit, inverter switching circuit, motor control circuit, rectifier circuit for controlling the operation of the refrigerator. Etc. are arranged along the outer box rear plate 2a.

  The printed wiring board 27 has a planar convex shape in which the convex portion 27b extends from the base portion 27a, and is arranged so that the convex portion 27b is positioned above in the state of being disposed in the concave portion 22. Yes. And the connector 40 which connects a bundle wire is arrange | positioned at the lower end of the base 27a located above the compressor 12, and the heat | fever which the compressor 12 generate | occur | produces will generate | occur | produce dew condensation at the connection part of a bundle wire. The printed wiring board 27 is prevented from being damaged. In addition, by arranging an AC component having a relatively large heat generation amount such as a rectifier circuit or a capacitor on the convex portion 27b of the printed wiring board 27, heat generated from the AC component or the like is released upward, and the vicinity of the base 27a The rise in the internal temperature of can be suppressed. At that time, it is preferable to provide a gap S2 above the convex portion 27b, whereby heat generated from an AC component or the like can be retained in the gap S2, and the temperature rise of the printed wiring board 27 can be more effectively performed. Can be suppressed.

  As shown in FIG. 10, a PC plate cover 32 made of a resin such as ABS is disposed on the back of the machine room 15 so as to cover at least the outer surface of the convex portion 27b on which the AC component is disposed. A cover body 23 made of metal such as iron is disposed so as to cover other portions, that is, the lower end of the machine room 15 in which the compressor 12 is arranged to the upper end part of the condenser 13, and the back wall of the machine room 15 is arranged. Forming. By configuring the back portion of the machine room 15 with the ABS resin and the metal in this way, it is possible to suppress the heat generated from the compressor 12 and the condenser 13 from being conducted to the PC plate cover 32 through the cover body 23. Can do. The resin constituting the PC plate cover 32 is preferably a color that easily absorbs radiant heat, such as black.

  An upper vent 25 is formed in the upper end of the cover body 23 at a position facing the upper portion of the condenser 13, and the recess 22 of the outer box rear plate 2 a on which the condenser 13 is erected. The duct 24 formed between them communicates with the outside of the machine room 15. In addition, a lower vent 28 is formed at a position at the lower end of the cover body 23 and facing the compressor 12.

  The components in the machine room 15 such as the compressor 12 and the condenser 13 are arranged as described above. When the heat dissipating fan 18 is rotated, as shown by the arrows in FIGS. Is sucked from the suction port 21 through the bottom of the main body and blown out from the bell mouth portion into the machine chamber 15.

  The air blown into the machine room 15 by the heat radiating fan 18 is sent rearward along the axial flow, but is brought into contact with the cover body 23 and partly guided upward as indicated by arrows in FIG. Then, the air flows into the duct 24 formed by the concave portion 22 of the rear plate and the cover body 23, and heat is exchanged with the condenser 13 by the air blown directly from the fan to cool it. As shown, it flows out from the upper vent 25 at the upper end of the cover body 23. In particular, the condenser 13 is different from the case where a heat exchange with a large surface area due to the conventional configuration occurs, and a large heat exchange air volume due to a high wind speed can be obtained, and the condenser 13 itself can be made compact. it can.

  At the same time, a part of the blown-out air is shunted toward the center of the main body by abutting against the cover body 23, and after being dissipated by exchanging heat with the compressor 12, the lower vent hole formed on the side of the cover body 23 It flows out from 28 to the outside. Since the air flow in this case is also blown air from the heat radiating fan 18, the wind speed is fast, and the air temperature is not yet heat-exchanged as compared with the conventional one, so that the cooling effect is great. The heat dissipation efficiency of the condenser 13 can be increased, and power consumption can be reduced by an effective refrigeration operation.

  At this time, the rotation axis of the heat radiating fan 18 is aligned with the front-rear direction of the machine room 15, and the casing dimensions including the fan diameter have an influence on the depth dimension compared to the conventional configuration along the width direction of the machine room. Therefore, the depth dimension for installing the heat radiating fan 18 can be reduced, and the volume of the machine room 15 can be greatly reduced.

  In addition, air for both the compressor 12 and the condenser 13 flows through the upper part of the evaporating dish 19, and heat from the discharge pipe 26 disposed in the inside of the dish, as well as the compressor and condensing. In combination with the high temperature atmosphere in the machine room 15 by the vessel, the defrost water is effectively evaporated.

  On the other hand, for example, when the heat dissipating fan 18 is operated for a long period of time, dust accumulates in the suction port 21 to cause the clogging phenomenon of the suction port 21, and the supply of outside air may be interrupted. In such a case, even if the heat radiating fan 18 rotates, it becomes idle and cannot send outside air into the machine room 15. However, in the refrigerator of this embodiment, the upper part of the condenser 13 of the cover body 23 and Since the upper vent 25 is formed at the facing position and the lower vent 28 is formed at the position facing the refrigerant compressor 12, the air warmed by the condenser 13 is outside the machine chamber 15 from the upper vent 25. The outside air is taken in from the lower vent 28 into the machine chamber 15 where the internal pressure is reduced, and the taken outside air exchanges heat with the compressor 12, the condenser 13, and the like from the upper vent 25. Released. That is, the heat generated from the compressor 12, the condenser 13, and the like generates natural convection inside the machine room 15 using the lower vent 28 as an inlet and the upper vent 25 as an outlet, thereby causing the condenser 13. Thus, it is possible to cool the parts arranged in the machine room 15 and to secure the refrigeration power of the refrigeration cycle.

  By the way, as shown in FIG. 11, front legs 29 that support the front part of the refrigerator body 1 and prevent it from falling forward are arranged at both front end portions of the bottom surface 42 of the outer box forming the bottom surface of the refrigerator body 1. A handle 44 for transporting the refrigerator main body 1 is disposed inside.

  As shown in FIG. 12, the front foot 29 includes a base portion 29 a that is fixed to the bottom surface 42 of the outer box and a foot portion 29 a that is disposed at a lower portion of the front end, and the foot portion 29 b is forward of the front surface of the refrigerator main body 1. The base portion 29a is fixed to the bottom surface of the outer box by screws so as to come into contact with the floor surface.

  In such a front foot 29, immediately before the refrigerator body 1 falls forward, a rotational moment in a direction to separate from the bottom surface 42 of the outer box acts on the base portion 29a of the front foot 29 and is provided at the center in the width direction of the base portion 29a. The force pulled to the outer box bottom surface 42 side by the screw 29c for screwing acts. Therefore, the base portion 29a undergoes a bending deformation in the width direction in which both side portions are displaced downward. Therefore, by forming the bead 29d in the width direction on the contact surface of the base portion 29a that contacts the bottom surface of the outer box, the strength can be improved and the bending deformation in the width direction of the base portion 29a can be suppressed. It is possible to prevent 1 from falling forward.

  As shown in FIGS. 13 and 14, the handle 44 has a bottom surface of the outer box so that a handle 44 a through which a finger of a person carrying the refrigerator body 1 is passed and held is positioned forward of the front surface of the refrigerator body 1. It is fixed by screwing in the recess 46 formed in the above. Thus, by arranging the handle portion 44a in front of the front surface of the refrigerator main body 1, the carrier can easily hold it, and the position of the outer box bottom plate can be compared with the case where the handle portion 44a is arranged on the bottom surface of the refrigerator main body 1. It can be lowered downward, and the storage volume in the compartment can be expanded.

  ADVANTAGE OF THE INVENTION According to this invention, it can utilize for the refrigerator which made the machine room compact and enlarged the internal volume.

It is a longitudinal cross-sectional view of the refrigerator which shows one Embodiment of this invention. It is the perspective view which looked at the machine room of the refrigerator of FIG. 1 from the back direction. FIG. 3 is an enlarged longitudinal sectional view of a machine room portion in FIG. 2. It is a cross-sectional view of the compressor portion of the machine room in FIG. It is a schematic longitudinal cross-sectional view which shows the condenser form in FIG. It is a perspective view of the comp stand for demonstrating the fixed structure of a fan casing. It is a perspective view which shows the principal part of a machine room. It is a perspective view of the compression stand for demonstrating the fixed structure of an evaporating dish. It is sectional drawing which shows the state by which the evaporating dish was fixed to the compression stand. It is a perspective view which shows the state which attached the cover body to the machine room part of FIG. It is a principal part expansion perspective view of a refrigerator. It is a disassembled perspective view which shows the attachment state of a forefoot. It is a perspective view which shows the handle fixed to the outer box bottom plate. It is a principal part expanded sectional view of the refrigerator which shows the fixed state of a handle. It is a rear view which shows the machine room of the conventional refrigerator. It is a longitudinal cross-sectional view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Refrigerator main body 2 Outer box 2a Rear plate 2b Bottom face 3, 3a Heat insulation wall 4 Inner box 4a Inner box bottom face 7 Freezer compartment 8, 9 Cooler 12 Compressor 13 Condenser 15 Machine room 16 Comp stand 17 Step part 18 Radiation fan 19 Evaporation dish 20 Fan casing 20a Small hole 21 Suction port 22 Recess 23 Cover body 24 Duct 25 Upper vent 27 Printed circuit board 28 Lower vent 29 Front foot

Claims (1)

A machine room formed at the lower back of the refrigerator main body, a refrigerant compressor arranged close to one side in the width direction of the machine room, and a rear face on the other side in the width direction of the machine room at a position higher than the refrigerant compressor A condenser arranged along the wall and a heat dissipating fan arranged so that the axial flow is in the front-rear direction of the main body facing the condenser,
At the bottom of the refrigerator body, a heat radiating fan forms a suction port for sucking air into the inside of the machine room. On the back wall of the machine room, a lower vent is placed at a position facing the refrigerant compressor, and a condenser is placed. An upper vent is formed at each position, and when the supply of air from the suction port is shut off, the air sucked from the lower vent is circulated to the compressor and the condenser by natural convection and the upper vent A refrigerator characterized by being discharged from.

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