JP2006105510A - Refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerator with reduced power consumption by increasing the radiating capacity of a condenser, for power saving, and improving the COP of a cooling cycle. <P>SOLUTION: This refrigerator comprises a machine chamber 140, a first condenser 143, and a blower 142 forcedly ventilating the condenser 143. The condenser 143 includes a number of pipes 151 having fins 150. In the condenser 143, the pipes 151 are mutually superposed so as to form a substantially cylindrical internal space 152, and a space between the pipes 151 is formed so that the project planes in the pipe 151 diameter direction of the fins 150 attached to the adjacent pipes 151 are overlapped. Therefore, when the blower 142 is operated, the ventilation between the internal space and the outside of the first condenser 143 is promoted to increase the overall heat radiation quantity of the first condenser 143. Consequently, the compression ratio of the cycle is reduced to increase the cycle COP, and the power consumption of the refrigerator 101 can be reduced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a refrigerator having a refrigeration cycle such as a condenser that is forcibly cooled.

  Conventionally, most of the condensers are disposed on the inner wall of the refrigerator outer box and radiate heat in the entire outer box. However, in recent years, as the demand for increasing the capacity of the refrigerator and reducing the installation space has increased, The condenser alone is not enough for heat dissipation. For this reason, in addition to the above-described condenser, a condenser is disposed in a space secured in a section outside the refrigerator, a so-called machine room, and the heat radiation capacity is improved by forcibly ventilating the condenser with a blower. (For example, refer to Patent Document 1).

  Hereinafter, the conventional refrigerator will be described with reference to the drawings.

  FIG. 13: shows the front view which shows the main body of the conventional refrigerator. FIG. 14 is a sectional view taken along line FF ′ of FIG. FIG. 15: shows the front view of the machine room of the conventional refrigerator. As shown in FIGS. 13 to 15, the conventional refrigerator 1 includes an outer box 2 that forms the outer wall of the refrigerator 1, an inner box 3 that forms the inner wall of the refrigerator, and an outer box 2 and an inner box 3. A heat insulating box 5 made of foam heat-filled urethane heat insulating material 4 and a heat insulating box 5 are vertically partitioned by a partition wall 6 to form a refrigerator compartment 7 and a freezer compartment 8 respectively. The condenser 20 is brought into close contact with the inner surface of the outer box 2 of the refrigerator 1 using, for example, a heat conductive adhesive tape 21 such as an aluminum stay, and the outer box 2 also serves as a heat radiator (see FIG. 14). Furthermore, in the machine room 40 located at the lower rear outside of the refrigerator 1, there are cooling cycle parts such as a compressor 41, a blower 42, a condenser 43, a dryer 45, and a capillary (not shown). In the condenser 43, fins 50 for promoting heat dissipation are fixed to the pipe 51, and the pipe 51 is densely molded. And it arrange | positions with the air blower 42, the condenser 43, and the compressor 41 in order from the side surface of the machine room 40 (refer FIG. 15). As a result, the condenser 43 is ventilated by the blower 42, and the purpose is to provide the refrigerator 1 in which the heat exchange efficiency is increased and the heat dissipation capability is increased.

In another conventional example, FIG. 16 is a perspective view of a machine room of a refrigerator, and a pipe composed of a straight portion 80 and a bending portion 81 so that the condenser 43 is disposed in a thin plate space on the bottom surface of the refrigerator 1. 51 is disposed on the entire bottom surface to increase the heat radiation area. As a result, it aims at providing the refrigerator 1 which increases heat dissipation capability (for example, refer patent document 2).
JP 2001-255048 A JP-A-7-167547

  However, the condenser 43 in the conventional machine room 40 attempts to reduce the gap between the pipes and increase the ventilation area of the pipes and fins in order to increase the heat radiation capacity in a limited installation space. When the gap is reduced, the fins attached to the pipe interfere with each other, and noise and vibration due to rubbing and the like are generated.

  As a result, there is a limit to minimizing the gap distance between pipes, and a gap between pipes is generated.

  As a result, the air flowing toward the condenser 43 passes between the pipes having low ventilation resistance, and ventilation between the fins 50 and the pipes 51 is reduced, and heat exchange is not performed.

  Further, the condenser 43 is disposed on the downstream side of the air flow of the blower 42, but the air discharged from the blower 42 flows into the ineffective space below the condenser 43 having a small ventilation resistance, and enters the condenser 43. There is not enough ventilation.

  As a result, the condensation temperature is increased, the compression ratio of the refrigeration cycle is increased, and the cycle COP is decreased. As a result, the power consumption of the refrigerator 1 is increased.

  Further, since the conventional condenser 43 is disposed on the bottom surface of the refrigerator 1, it is necessary to dispose a large amount of the condenser 43 in a thin plate-like space. Therefore, the R dimension of the bent portion 81 is, for example, about R10 mm from the viewpoint of securing the heat radiation amount (see FIG. 15). Moreover, in order to extend the condenser length also in the condenser 43 arrange | positioned in the machine room 40, the cono-shaped and L-shaped pipe piping structure with a small bending dimension was performed (refer FIG. 14).

  As a result, during transport and refrigerator assembly, the stress generated in the bent portion 81 becomes high, causing a problem that pipe breakage and breakage occur.

  In addition, the gap between the pipes 51 must be secured at a certain distance in order to improve the ventilation, but since the pipe is an elastic body, there is a possibility that it will be deformed over time and deformed from its initial assembled shape. . As a result, the air is ventilated around the portion where the gap is enlarged, and the heat dissipation amount is reduced.

  In order to solve the above problems, a fixing member that fixes the pipes 51 or the fins 50 and keeps the gap distance between the pipes constant is required. However, the ring-shaped pipe 51 and the helical fin 50 are three-dimensionally configured. Therefore, it is difficult to fix and hold, and the manufacturing cost increases. Furthermore, there has been a problem that the number of steps for assembling the condenser 43 and the fixing member during assembly is increased.

  The present invention solves the conventional problem, and without increasing the volume of the machine room 40, increases the heat radiation capacity of the condenser 43, which is inexpensive and excellent in assemblability, and maintains the power consumption of the refrigerator low, It aims at providing the refrigerator 1 which can prevent the refrigerant | coolant leak by pipe breakage, breakage, etc.

  In order to solve the above conventional problems, a refrigerator according to the present invention is a condenser composed of a pipe having a large number of fins, wherein the pipe is formed so as to form a substantially cylindrical internal space, and further, both ends of the internal space. One of the openings is made to face the blower, the ventilation resistance between the other opening and the internal space is greater than the ventilation resistance between the gap between the pipes and the internal space, and attached to the adjacent pipe. The fins to be installed are installed so that the projection surfaces in the pipe diameter direction of the fins overlap.

  Thereby, the clearance gap between pipes can be made as small as possible, the ventilation area to a condenser can be increased, a condenser can be forcedly cooled, and the temperature of a refrigerant | coolant can further be reduced rather than before. Moreover, since the bending part R dimension is large, the stress which generate | occur | produces in a bending part at the time of transport or refrigerator assembly becomes small.

  Further, the refrigerator of the present invention is composed of a pipe having a large number of fins, the pipes are formed so as to form a substantially cylindrical internal space, and the fins attached to the adjacent pipes are arranged in the pipe diameter direction of the fins. The projection surfaces are fixed so as to overlap. Furthermore, the condenser is installed so as to separate the machine room into a windward and leeward space.

  As a result, most of the air passing through the condenser is ventilated across the fins or pipes, the condenser is forcibly cooled, and the temperature of the refrigerant also decreases.

  The refrigerator of the present invention can increase the heat exchange efficiency of the condenser without increasing the volume of the machine room, improve the heat dissipation capacity and the COP of the cooling cycle, and reduce the power consumption of the refrigerator.

  Further, since the whole condenser is integrally fixed by providing the means for fixing the condenser, noise and vibration due to rubbing between the fin and the pipe can be reduced.

  In addition, the refrigerator of the present invention suppresses refrigerant leakage due to breakage or breakage of the condenser pipe during transportation or assembly because the condenser overlaps the pipe having a large number of fins with a gap between the pipes. it can. Furthermore, since the number of condenser molding steps is small and the capital investment is small, the manufacturing cost is low.

  The invention according to claim 1 comprises a machine room formed in a section outside the refrigerator main body, a condenser provided in the machine room, and a blower for forcibly ventilating the condenser. The pipe is formed so that the condenser forms a substantially cylindrical internal space. Further, among the openings at both ends of the internal space, the air blower is opposed to one opening, and the ventilation resistance between the other opening and the internal space is made larger than the ventilation resistance between the gap between the pipes and the internal space, In addition, by forming a gap between the pipes so that the projection surfaces in the pipe diameter direction of the fins attached to the adjacent pipes overlap each other, the internal space is passed through the gap between the pipes in the entire condenser circumference when the fan is operating. And the ventilation of the condenser are promoted, and the condenser is forcibly cooled. At this time, since the distance between pipes is smaller than the conventional distance, the ventilation area to a pipe and a fin increases conventionally. Further, since the heat transfer rate is increased by promoting the turbulent flow between the air and the pipe, the total heat radiation amount of the condenser is increased, and the temperature of the refrigerant passing through the condenser is remarkably lowered. As a result, the cycle compression ratio is reduced, the cycle COP is increased, and the power consumption of the refrigerator can be reduced.

  The invention according to claim 2 comprises a machine room formed in a section outside the refrigerator main body, a condenser provided in the machine room, and a blower for forcibly ventilating the condenser. The condenser is installed so as to be separated into the windward and leeward spaces, and the condenser is composed of a pipe having a large number of fins, and the pipes are formed so as to form a substantially cylindrical internal space, and By forming a gap between the pipes so that the projection surfaces in the pipe diameter direction of the fins attached to adjacent pipes overlap each other, the air flows from the windward space to the internal space through the gap between the pipes when the fan is operating. Further, the condenser is forcibly cooled by being discharged into the space on the leeward side through a gap between the pipes. At this time, since the distance between pipes is smaller than the conventional distance, the ventilation area to a pipe and a fin increases from the past. Further, since the heat transfer rate is increased by promoting the turbulent flow between the air and the pipe, the total heat radiation amount of the condenser is increased, and the temperature of the refrigerant passing through the condenser is remarkably lowered. As a result, the cycle compression ratio is reduced, the cycle COP is increased, and the power consumption of the refrigerator can be reduced.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the gap between the pipes is kept constant by providing means for fixing the pipes or fins to the condenser. As a result, the entire condenser is integrated, and it is possible to reduce rubbing noise and vibration generated by the interference of fins or pipes during transportation and assembly. Moreover, since the ventilation resistance between pipes is equivalent over the whole condenser, it ventilates over the condenser whole area, and a heat dissipation capability improves. Furthermore, since the entire cylindrical condenser is fixed during assembly, the number of man-hours required for assembly can be reduced as compared with the prior art, and the fixing means can be inexpensive.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein a compressor is disposed on the leeward side of the condenser, and the compressor is forcibly cooled during operation of the blower. As a result, the compressor itself is forcibly ventilated, the temperature of the compressor is lowered, the temperature of the suction refrigerant gas is also lowered, and the volume efficiency and the compressor COP are improved. As a result, the cycle COP is increased and the power consumption of the refrigerator is reduced. Can be reduced.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the fin has a substantially strip-shaped thin plate shape, is disposed substantially perpendicular to the pipe, and is crimped in a spiral shape. This improves the thermal conductivity of the fins and pipes, promotes the heat dissipation performance of the entire condenser, and significantly reduces the temperature of the refrigerant passing through the condenser. As a result, the cycle compression ratio is reduced, the cycle COP is increased, and the power consumption of the refrigerator can be reduced.

  The invention according to claim 6 is the invention according to any one of claims 1 to 5, wherein the condenser is applied with a heat dissipating paint, and further the paint is inserted into a minute gap between the fin and the pipe. . As a result, the thermal conductivity of the fins and pipes is improved, the heat dissipation performance of the entire condenser is promoted, and the temperature of the refrigerant passing through the condenser is significantly reduced. As a result, the cycle compression ratio is reduced, the cycle COP is increased, and the power consumption of the refrigerator can be reduced.

  According to a seventh aspect of the present invention, in the invention according to any one of the first to sixth aspects, the air intake port of the machine room is installed on the substantially upstream side of the condenser, whereby the wind of the condenser is As a result of facilitating ventilation to the fins and pipes located in the upper part, the heat dissipation performance of the entire condenser is also improved. As a result, the cycle compression ratio is reduced, the cycle COP is increased, and the power consumption of the refrigerator can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments.

(Embodiment 1)
1 is a plan view of a machine room of a refrigerator according to Embodiment 1 of the present invention, FIG. 2 is a cross-sectional view taken along the line AA ′ of FIG. 1 of the refrigerator according to the embodiment, and FIG. FIG. 4 is a cross-sectional view of the main part of the first condenser, FIG. 4 is a cross-sectional view of the refrigerator according to the embodiment taken along the line BB ′ of FIG. 1, FIG. It is a refrigerating cycle figure of the refrigerator by embodiment.

  From FIG. 1 to FIG. 6, the refrigerator 101 according to the first embodiment includes a steel outer box 102 that opens forward, an inner box 103 made of hard resin, and urethane insulation that is foam-filled between the outer box 102 and the inner box 103. A heat insulating box (not shown) made of a material 104, a refrigerating room 107 and a freezing room 108 separated by an internal partition wall 106, a refrigerating room door 110, a freezing room door 111, and a gasket for sealing the heat insulating box ( A refrigerator compartment sensor 113 for detecting the temperature of the refrigerator compartment 107, a refrigerator compartment sensor 114 for detecting the temperature of the refrigerator compartment 108, a refrigerator compartment damper 115 for adjusting the cold air to the refrigerator compartment 107, and a refrigerator 101, a cooler 116 disposed on the back of the freezer compartment 108 constituting the refrigeration cycle 101, a fan 117 for ventilating the cooler, and a machine room 1 provided at the lower back of the refrigerator 101 outside. 0 consists of.

  The machine room 140 is formed by a machine room wall 140a, a machine room back cover 140b, and a machine room base 140c. Further, the compressor 141, the blower 142 that ventilates the machine room 140, the first condenser 143, a part of the capillary tube 144 that is a decompressor, the cooling cycle parts such as the dryer 145, and the like are configured. Moreover, the 1st condenser 143, the air blower 142, and the compressor 141 are arrange | positioned in order from the right side surface of the machine room 140 from FIG.

  The first condenser 143 includes a strip-like thin plate-like fin 150 and a pipe 151. The first condenser 143 is disposed so as to be substantially perpendicular to the central axis of the straight pipe 151 and is crimped in a spiral shape. Stick.

  Further, the pipe 151 with the fin 150 is formed in a spiral shape so as to overlap with each other while providing a gap between the adjacent pipes 151. At this time, the fins 150a associated with the pipes 151a are close to each other so that the projection surfaces in the diameter direction of the pipes 151b of the adjacent fins 150b overlap with each other, and the band-shaped fixing member 157 is attached to the outer surface of the adjacent pipe 151b. One condenser 143 is wound and fixed in the direction of the cylindrical axis (see FIG. 3).

  At this time, a cylindrical internal space 152 is formed in the first condenser 143, and a blower 142 is installed in the left-side opening 154 of the internal space of the first condenser 143 in FIGS. The right opening 155 is provided with a cover 156 that closes the opening.

  Further, the machine room 140 is separated into two rooms by a casing 158 that connects the blower 142 and the machine room 140, and the first condenser 143 is lightly press-fitted into a protrusion 158 a provided in the casing 158 and fixed.

  Further, regarding the ventilation in the machine room, the air intake port 159 is provided on the machine room wall 140a on the windward side of the first condenser 143, and the air that flows out of the machine room 140 is sucked from the outside of the machine room. It is discharged from the discharge port 160 provided in the cover 140b to the outside of the refrigerator 101.

  A heat dissipating paint 161 was applied to the surfaces of the fins 150 and the pipes 151 of the first condenser 143.

  The second condenser 170 is installed on the inner wall side of the outer box 102 between the outer box 102 and the urethane heat insulating material 104.

  About the refrigerator comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, the flow of the refrigerant in the refrigeration cycle will be described. The high-temperature and high-pressure gas compressed in the compressor 141 is transferred to the first condenser 143 disposed in the machine room 140, and heat is exchanged. Heat is exchanged with the air outside the condenser 143 to be liquefied. Further, the refrigerant communicates with the second condenser 170, and the condensing action is further promoted. Next, the liquefied refrigerant passes through the dryer 145, is decompressed by the capillary tube 144 having a decompression action, flows into the cooler 116, and cools the inside of the refrigerator 101 by heat exchange with the air around the cooler 116. At the same time, the temperature of itself rises, and finally it is gasified and returns to the compressor 141 again.

  Next, the heat exchange of the first condenser 143 during the operation of the compressor 141 will be described in detail. The blower 142 starts to operate as the compressor 141 operates. As a result, the pressure in the vicinity of the suction of the blower 142 is relatively lower than the air pressure outside the refrigerator 101 communicating with the space. As a result, the outside air flows into the machine room 140 through the air intake 159 provided in the machine room wall 140a of the machine room 140.

  Next, the air that has moved toward the blower 142 and has reached the vicinity of the cover 156 tends to flow linearly toward the first condenser. However, since the ventilation resistance is high by the cover, the first condenser having a low resistance is used. The cover is turned around toward the side surface of the cylinder (vertical direction in FIG. 2). Then, the air that has reached the outer periphery of the cover flows into the internal space 152 through a minute gap interposed between the pipes 151 from the upstream side to the downstream side of the first condenser. At this time, the interval between the pipes of the first condenser / condenser 243 is 5 to 10 mm, which can be reduced to half or less compared to the interval of the conventional condenser of about 20 to 40 mm. In addition, since the interval between the pipes 251 can be maintained evenly, the ventilation resistance is almost equal, the deviation of the ventilation is reduced, and the entire pipe is ventilated.

  As described above, the first condenser 143 is ventilated, the effective heat exchange area is increased, the turbulent phenomenon around the pipe 151 and the fin 150 is promoted, and the temperature boundary layer can be thinned, so that heat transfer between air and refrigerant The rate increases. Therefore, heat exchange between the air and the refrigerant is promoted, and the amount of heat exchange increases.

  From the above, since the refrigerant temperature in the condenser is greatly lowered, the compression ratio of the refrigeration cycle is reduced and the cycle COP is increased. At the same time, the operating rate is lowered, so that the power consumption can finally be greatly reduced. In the actual machine test results, the average dryer temperature decreased by 3 to 5 ° C., and at the same time, an effect of reducing refrigerator power consumption by 3 to 10 kWh / year was obtained.

  Moreover, the air discharged from the air blower 142 is directly ventilated to the compressor 141, and cools the compressor 141 main body. Thereby, by lowering the refrigerant gas temperature inside the compressor 141, the specific volume can be reduced, so that the volumetric efficiency is increased and the compressor 141 can be improved in performance.

  In addition, an increase in discharge pressure can be suppressed, and oil deterioration and abnormal wear of the sliding portion are prevented in advance. Furthermore, a reduction in motor efficiency and motor deterioration due to the high temperature of the compressor 141 can be suppressed, and the performance and reliability of the compressor 141 can be ensured.

  Further, the condenser itself has the heat conductivity improved because the fins 150 are spirally fixed to the surface of the pipe 151. Further, in order to form the pipe 151 itself into a spiral shape, the pipe 151 is wound around the outer periphery of the cylindrical forming jig. As a result, the condenser 143 capable of increasing the R dimension can be formed with respect to the conventional cono-shaped or L-shaped bending R, and metal fatigue or the like when external stress is applied during transportation or refrigerator assembly. The risk of pipe bending or breakage due to the above can be prevented.

  In this embodiment, the blower is disposed on the downstream side of the condenser 143. However, even if the blower is disposed on the upstream side of the condenser 143, the same effect can be obtained because the same air volume can be obtained.

  The fins 150 and the pipes 151 of the condenser 143 are fixed by pressure bonding. However, by applying a heat dissipating paint, the adhesion area between the fins 150 and the pipes 151 is increased, and the heat dissipating performance is enhanced by the paint having high heat dissipating properties. Can be increased.

  In addition, although the machine room 140 of the present embodiment is the lower back of the refrigerator 101, if the predetermined space for installing the cooling device described above is secured on the back of the refrigerator 101, it can be installed in any place, Heat dissipation performance can be secured and power consumption can be greatly reduced.

  As described above, in the present embodiment, the machine room formed in a single section of the refrigerator body, the first condenser provided in the machine room, and the blower for forcibly passing the first condenser, The first condenser includes a pipe having a large number of fins, and the pipe is formed so that the first condenser forms a substantially cylindrical internal space. Further, of the openings at both ends of the internal space, the blower is made to face one of the openings, and the ventilation resistance between the other opening and the internal space is set between the gap between the pipes and the internal space. A gap between the pipes is formed so that the projection surfaces in the pipe diameter direction of the fins attached to the adjacent pipes are larger than the resistance, and during the operation of the blower, the gap between the pipes in the entire circumference of the condenser is formed. Accordingly, ventilation between the internal space and the outside of the condenser is promoted, and the condenser is forcibly cooled. At this time, since the distance between pipes is smaller than the conventional distance, the ventilation area to a pipe and a fin increases conventionally. Further, since the heat transfer rate is increased by promoting the turbulent flow between the air and the pipe, the total heat radiation amount of the condenser is increased, and the temperature of the refrigerant passing through the condenser is remarkably lowered. As a result, the cycle compression ratio is reduced, the cycle COP is increased, and the power consumption of the refrigerator can be reduced.

(Embodiment 2)
7 is a plan view of the machine room of the refrigerator according to the second embodiment of the present invention, FIG. 8 is a sectional view taken along the line DD ′ of FIG. 7 of the refrigerator according to the same embodiment, and FIG. FIG. 10 is an air passage configuration diagram of the refrigerator according to the embodiment, and FIG. 11 is a refrigeration cycle diagram of the refrigerator according to the embodiment. FIG. 12 is a plan view of a machine room of another refrigerator according to Embodiment 2 of the present invention.

  From FIG. 7 to FIG. 11, the refrigerator 201 according to the second embodiment includes a steel outer box 202 that opens forward, an inner box 203 made of hard resin, and urethane insulation that is foam-filled between the outer box 202 and the inner box 203. A heat insulating box (not shown) made of the material 204, a refrigerating room 207 and a freezing room 208 separated by a partition wall 206, a gasket for sealing the refrigerating room door 210 and the freezing room door 211 and the heat insulating box ( A refrigerating room sensor 213 for detecting the temperature of the refrigerating room 207, a freezing room sensor 214 for detecting the temperature of the freezing room 208, a refrigerating room damper 215 for adjusting the cold air to the refrigerating room 207, a refrigerator 201, a cooler 216 disposed on the back of the freezer compartment 208 constituting the refrigeration cycle 201, a fan 217 for ventilating the cooler, and a machine room provided at the lower back of the refrigerator 201 outside Consisting of 40.

  The machine room 240 is formed by a machine room wall 240a, a machine room back cover 240b, and a machine room base 240c. The compressor 241, the blower 242 that ventilates the machine room 240, the first condenser 243, a part of the capillary tube 244 that is a decompressor, and cooling cycle parts such as the dryer 245 are configured. Moreover, the 1st condenser 243, the air blower 242, and the compressor 241 are arrange | positioned in order from the side surface right side of the machine room 240 from FIG.

  The first condenser 243 includes a strip-like thin plate-like fin 250 and a pipe 251. The first condenser 243 is disposed so as to be substantially perpendicular to the central axis of the straight pipe 251 and is crimped spirally. Stick.

  Further, the pipe 251 with the fins 250 is formed in a spiral shape so as to overlap while providing a gap between the adjacent pipes 251. At this time, a cylindrical internal space 252 is formed inside the first condenser 243. At this time, the fins 250a associated with the pipes 251a are close to each other so that the projection surfaces of the adjacent pipes 251b in the diameter direction overlap with each other, and the belt-like fixing member 257 is attached to the outer surface of the adjacent pipe 251b. One condenser 243 is wound in the cylindrical axis direction and fixed (see FIG. 9).

  Further, in FIG. 8, a cover 256 is installed so that the upper and lower openings 254 and 255 of the first condenser 243 are opposed to and close to the machine room wall 240 a and the machine room base 240 c and the openings 254 and 255 are closed. Further, buffer materials 258 a and 258 b are provided to fill the space between the first condenser 243 and the machine room wall 240 a top surface and the machine room base 240 c, and the first condenser 243 is fixed to the machine room 240. As a result, the cylindrical first condenser 243 separates the machine room 240 into two rooms, and the air in the machine room 240 is ventilated from the left side surface to the right side surface of the machine room 240.

  Further, regarding ventilation in the machine room 240, air that is sucked in from the outside by providing the suction port 255 in the machine room wall 240 a and flows out of the machine room 240 is provided in the machine room back cover 240 b by providing a discharge port 256 outside the refrigerator 201. Vomited.

  A heat dissipating paint 261 was applied to the surfaces of the fins 250 and the pipes 251 of the first condenser 243.

  The second condenser 270 is installed on the inner wall side of the outer box 202 between the outer box 202 and the urethane heat insulating material 204.

  About the refrigerator comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, the flow of the refrigerant in the refrigeration cycle will be described. The high-temperature high-pressure gas compressed in the compressor 241 is transferred to the first condenser 243 disposed in the machine room 240, and heat is exchanged. It cools and heat-exchanges with the air etc. of the 1st condenser 243 outside, and liquefies. Further, in the present embodiment, the second condenser 270 is communicated to further promote the condensing action. Next, the liquefied refrigerant passes through the dryer 245, is decompressed by the capillary tube 244, flows into the cooler 216, cools the interior by heat exchange with the interior air around the cooler 216, and The temperature is raised and finally gasified and returned to the compressor 241 again.

  Next, heat exchange in the first condenser 243 during the operation of the compressor 241 will be described in detail. The blower 242 starts to operate as the compressor 241 operates. As a result, the pressure in the vicinity of the suction of the blower 242 is relatively lower than the air pressure outside the refrigerator 201 communicating with the space. As a result, the outside air flows into the machine room 240 via the air intake port 259 provided in the machine room wall 240a of the machine room 240.

  Next, the air that has moved toward the blower 242 and has reached the vicinity of the right side (the air upstream side) of the first condenser 243, the cover 256 and the buffer materials 257a and 257b from FIGS. Since the gap between the upper and lower ends and the machine room 240 is closed to increase the ventilation resistance, the amount of ventilation from these gaps is almost eliminated. Instead, the air flows into the internal space 252 through a gap between the pipes 251 located in the right half of the first condenser 243 (see FIG. 7). At this time, the interval between the pipes 251 of the first condenser 243 is 5 to 10 mm, which can be reduced to half or less compared to the interval of the conventional condenser of about 20 to 40 mm. In addition, since the interval between the pipes 251 can be maintained evenly, the ventilation resistance is almost equal, the deviation of the ventilation is reduced, and the entire area of the pipe 251 is ventilated.

  Furthermore, the air that has flowed into the internal space 252 travels to the blower 242 through a gap between the pipes 251 located in the left half of the first condenser 243 (see FIG. 7). At this time, similarly to the ventilation state of the right half of the first condenser 243, the ventilation area can be expanded as compared with the conventional one.

  As described above, ventilation is performed throughout the first condenser 243, the effective heat exchange area is increased, the turbulent phenomenon around the pipe 251 and the fins 250 is promoted, and the temperature boundary layer can be thinned, so that heat transfer between air and refrigerant The rate increases. Therefore, heat exchange between the air and the refrigerant is promoted, and the amount of heat exchange increases.

  From the above, since the refrigerant temperature in the first condenser 243 is significantly reduced, the compression ratio of the refrigeration cycle is reduced and the cycle COP is increased. At the same time, the operating rate is lowered, so that the power consumption can finally be greatly reduced.

  Further, by compressing and fixing the first condenser 243 of FIG. 9 with the fixing member 257, the installation volume of the condenser can be reduced as compared with the case where it is not fixed. As a result, by using the space that can be reduced, a condenser can be added to increase the heat dissipation capability. Furthermore, since the first condenser 243 can be fixed as an integrated object, noise or vibration generated by interference between adjacent fins or pipes can be prevented.

  In this embodiment, urethane is used as the heat insulation box 205. However, for example, by placing a vacuum heat insulating material having a thermal conductivity of 0.0015 W / mK on a part or the whole of the heat insulation box 205, the amount of intrusion heat is greatly increased. The power consumption can be reduced.

  In this embodiment, the openings 254 and 255 of the first condenser 243 are opposed to and close to the top surface of the machine room wall 240a and the machine room base 240c. The same effect can be obtained by providing a means for filling the gap with the machine room by facing and close to the room back cover 240b (see FIG. 12).

  From the above, in the present embodiment, the machine room formed in a part of the refrigerator body, the first condenser provided in the machine room, and a blower for forcibly ventilating the first condenser, The condenser is installed so as to separate the machine room into a windward and leeward space, and the condenser is composed of a pipe having a number of fins, and the pipe has a substantially cylindrical interior. A space between the pipes is formed so as to form a space so that projection surfaces in the pipe diameter direction of the fins attached to the adjacent pipes overlap with each other, and the space on the windward side during the operation of the blower Then, the condenser is forcibly cooled by flowing into the internal space through the gap between the pipes and discharging into the space on the leeward side through the gap between the pipes.

  At this time, since the distance between pipes is smaller than the conventional distance, the ventilation area to a pipe and a fin increases conventionally. Further, since the heat transfer rate is increased by promoting the turbulent flow between the air and the pipe, the total heat radiation amount of the condenser is increased, and the temperature of the refrigerant passing through the condenser is remarkably lowered. As a result, the cycle compression ratio is reduced, the cycle COP is increased, and the power consumption of the refrigerator can be reduced.

  Further, by fixing the condenser with the fixing member, the size becomes compact and noise and vibration can be reduced.

  As described above, the refrigerator according to the present invention can increase the heat exchange efficiency of the condenser without increasing the volume of the machine room, improve the heat dissipation capacity and the COP of the cooling cycle, and reduce the power consumption of the refrigerator. Refrigerant leakage due to breakage or breakage of the condenser pipe during transportation or assembly can be suppressed. Furthermore, since the number of man-hours for forming the condenser is small and the capital investment is small, the manufacturing cost is low. Therefore, it can be applied to the use of reducing the power consumption of the entire refrigeration air conditioner.

The top view of the machine room of Embodiment 1 of the refrigerator by this invention AA 'line sectional view of FIG. Sectional drawing of the principal part of the 1st condenser of the refrigerator of the embodiment BB 'sectional view of FIG. Air passage configuration diagram of the refrigerator of the embodiment Refrigeration cycle diagram of the refrigerator of the same embodiment The top view of the machine room of Embodiment 2 of the refrigerator by this invention DD 'line sectional view of FIG. Sectional drawing of the principal part of the 1st condenser of the refrigerator of the embodiment Air passage configuration diagram of the refrigerator of the embodiment Refrigeration cycle diagram of the refrigerator of the same embodiment Plan view of the machine room of the refrigerator of the embodiment Front view showing the main body of a conventional refrigerator FF 'line sectional view of FIG. Front view of conventional refrigerator machine room Perspective view of another conventional refrigerator machine room

Explanation of symbols

101, 201 Refrigerator 140, 240 Machine room 141, 241 Compressor 142, 242 Blower 143, 243 First condenser 150, 250 Fin 151, 251 Pipe 152, 252 Internal space 154, 254 Opening 157, 257 Fixing member 159, 259 Air intake port 161,261 Heat-dissipating paint

Claims (7)

  A machine room formed in a section outside the refrigerator main body, a condenser provided in the machine room, and a blower for forcibly ventilating the condenser, the condenser comprising a pipe having a number of fins. The pipe is formed so that the condenser forms a substantially cylindrical internal space. Further, of the openings at both ends of the internal space, the blower is made to face one of the openings, and the ventilation resistance between the other opening and the internal space is set between the gap between the pipes and the internal space. By forming a gap between the pipes so that the projection surfaces in the pipe diametric direction of the fins attached to the adjacent pipes overlap with each other, the gap between the pipes is increased during operation of the blower. A refrigerator in which ventilation between the internal space and the outside is promoted and the condenser is forcibly cooled.   A machine room formed in a section outside the refrigerator main body, a condenser provided in the machine room, and a blower that forcibly ventilates the condenser, the condenser passing through the machine room on the leeward side and leeward side The condenser is composed of a pipe having a large number of fins, and the pipes are formed so as to overlap with each other so that the condenser forms a substantially cylindrical internal space. By forming a gap between the pipes so that projection surfaces in the pipe diameter direction of the fins attached to the pipe overlap with each other, the gap from the windward side through the gap between the pipes during operation of the blower A refrigerator in which the condenser is forcibly cooled by flowing into an internal space and being discharged into the leeward space through a gap between the pipes.   The refrigerator according to claim 1 or 2, wherein the pipe is maintained at a constant interval by providing means for fixing the pipe or the fin to the condenser.   The refrigerator according to any one of claims 1 to 3, wherein a compressor is disposed on the leeward side of the condenser, and the compressor is forcibly cooled during operation of the blower.   5. The thermal conductivity is improved according to claim 1, wherein the fin has a substantially strip-like thin plate shape, is disposed substantially perpendicular to the pipe, and is crimped in a spiral shape. 6. refrigerator.   The refrigerator according to any one of claims 1 to 5, wherein the condenser has improved thermal conductivity by applying a heat-dissipating paint.   The refrigerator according to any one of claims 1 to 6, wherein an air intake port of the machine room is installed substantially upstream from the condenser.

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