JPH0868587A - Machine room structure for refrigerator - Google Patents

Abstract

PURPOSE: To allow a special vent duct, etc., not to be used by particularly using a cooling fan of suction type to a compressor in a heat radiating structure for effectively cooling a main condenser and the compressor. CONSTITUTION: In the machine room of a refrigerator for containing a plate condenser 7, a main condenser, an evaporating tray 8, a compressor 9 and a cooling fan 13, the compressor 9 is installed to the depth side from the condenser 7, the main condenser, the tray 8, etc., toward the depth direction, the fan 13 is installed further depth side from the compressor 9, and a back cover 14 is installed further depth. Accordingly, since the main condenser and the compressor can be cooled with the cooling air from the passages, an efficient cooling structure is obtained. Further, since the back cover can be used to exhaust the heated air diffused by the fan, its cost not only becomes advantageous, but also the heat radiation to the upper surface of a deep freezing refrigerator can be facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator / freezer, and more particularly to a heat radiation structure for a refrigerator / freezer which effectively cools a condenser or a compressor.

[0002]

2. Description of the Related Art Generally, in a refrigerator-freezer, it is desired that an ineffective space in which food cannot be stored is as small as possible, and an effective space in a storage space in which food can be stored is large. Is ideal. The machine room is the most ineffective space and is becoming smaller. For this reason, the capacitors, compressors, etc. housed therein have a narrow space between them and the peripheral parts forming the machine room, and a shape and structure capable of effective heat dissipation are required. As a conventional technology of a heat dissipation structure in which a fan for cooling the condenser, the compressor and the like is arranged near the back wall of the machine room in a machine room in which the condenser, the compressor and the like are installed, for example, Japanese Utility Model Laid-Open No. 5-174
There is one described in Japanese Patent No. 83.

FIG. 24 is a perspective view of the conventional machine room described in the above publication, and FIG. 25 is an explanatory view seen from above showing the flow of air in the machine room of FIG. In FIG. 24, 32 is a front machine room cover, 36 is a condenser, 39 is a compressor, 4
0 is a base, 44 is a back cover, 41 is a suction duct in which a condenser is attached, and air for cooling the condenser flows.
42 is a fan motor, and 45 is a partition plate.

The machine room structure shown in FIG. 25 has a capacitor 3
6 on the front side of the refrigerator-freezer, the compressor 39 and the fan motor 42 side by side behind them, and the fan motor 42
Is arranged in a direction in which the air is blown to the compressor 39, that is, the rotation shaft of the fan motor 42 is substantially parallel to the back wall of the refrigerator / freezer, and between the fan motor 42 and the compressor 39 is substantially the same as the rotation shaft of the fan motor. A partition plate 45 having a substantially circular cylindrical shape centering on the same point and having a hole for guiding air to the compressor side and a mouth ring 35 and being substantially vertical to the fan motor rotation shaft is provided. The partition plate 45 divides the machine room into a condenser-side machine room A corresponding to the windward side and a compressor-side machine room B corresponding to the leeward side. Fan motor 42 and compressor 3
A rear cover 44 that covers the rear of the machine room is disposed at the rear of the machine room 9. The rear cover 44 is provided with an exhaust grill 38 in a portion corresponding to the compressor-side machine chamber B.

In this conventional example, the flow of air for cooling the condenser 36 and the compressor 39 is, as shown in FIG. 25, a fan motor 42 from a suction grill 33 provided on a front machine room cover 32 covering the front of the machine room. Is sucked in by the condenser and passes through the suction duct 41, the high temperature condenser 36
After that, it is passed through the mouth ring 35 of the partition plate 45 and sprayed onto the compressor 39. After that, a part is discharged from the exhaust grill 38 of the rear cover 44 to the back of the refrigerator / freezer, and the rest passes through the exhaust duct 46 and is discharged to the front of the refrigerator / freezer.

However, in such a structure, since the compressor 39 is arranged on the downstream side of the air flow as compared with the condenser 36, the air temperature for cooling the compressor 39 is
Front machine room cover 32 by heat exchange with condenser 36
There is a problem in that the cooling effect of the compressor 39 cannot be sufficiently obtained, since it is higher than when sucked.

Further, as described above, since the machine room space is in the direction of contraction, the air sucked from the front machine room cover 32 is guided to the vicinity of the back wall of the refrigerator / freezer and the condenser 36 is housed inside. In the structure in which the duct 41 and the exhaust duct 46 that guides the air after cooling the condenser and the compressor to the front machine chamber cover 32 are arranged in parallel, the space through which the air flows becomes small and the ventilation resistance applied to the fan motor 42 becomes large. So, in order to obtain sufficient heat dissipation effect,
It becomes necessary to increase the torque of the fan motor 42 and increase the air volume, and the input of the fan motor 42 also increases, leading to an increase in the power consumption of the refrigerator / freezer.

Further, since the air after cooling the compressor 39 is again discharged from the front machine chamber cover 32, when the refrigerator / freezer user opens and closes the door, warm air after heat exchange with the condenser 36 and the compressor 39 is added. There was a problem in that it was sprayed on and felt uncomfortable. Further, since the suction grill 33 and the exhaust grill 38 are close to each other on the front machine room cover 32, a short circuit is made between the suction grill 33 and the exhaust grill 38, and the exhaust air is sucked again from the suction grill 33, so that the condenser 36 is discharged. In addition, the temperature of the air that cools the compressor 39 and the like gradually increases, and there is a possibility that a sufficient heat radiation effect cannot be obtained.

[0009]

As described above, the conventional heat dissipation structure in which the condenser and the fan for cooling the compressor are arranged near the back wall of the machine room has the following problems. 1. Since the arrangement positions of the condenser and the compressor are in an upstream / downstream relationship with respect to the flow of air, and the configuration is such that the air after cooling the condenser is blown to the compressor to cool it, the air temperature before cooling the condenser, That is, the temperature of the air blown to the compressor is higher than the temperature of the air in the place where the refrigerator-freezer is installed, and the effect is reduced in terms of cooling the compressor.

[0010] 2. With a structure in which a condenser is housed inside and a suction duct that guides the air that has been sucked in from the front machine room cover to exchange heat with the condenser and an exhaust duct that guides warm air after cooling the compressor to the front machine room cover are installed side by side. From the viewpoint of reducing the space of the machine room, which is the most ineffective space for a refrigerator / freezer, the space occupied by the suction duct and the exhaust duct becomes even smaller, and in the suction duct, the gap between the condenser and the suction duct,
That is, there is a problem that the air flow space for allowing the air to flow and exchanging heat with the condenser is narrow, the ventilation resistance in the suction duct becomes large, and sufficient heat radiation cannot be performed.

Therefore, it is necessary to improve the torque of the fan motor to increase the air volume, or to improve the intake duct by increasing the intake duct size. However, when the air volume is increased, the wind noise generated when the fan is rotated becomes louder, and it becomes necessary to take noise countermeasures.
Also, make the exhaust duct smaller and the suction duct larger,
Considering the increase in ventilation resistance in the exhaust duct when expanding the condenser, it is difficult to expand laterally, and the stacking method that expands the condenser in the height direction is obliged to be adopted. This led to the problem of expanding the invalid space.

3. Heat is exchanged by the condenser, and then it is blown to the compressor, and the warm air with a further raised temperature is discharged from the front machine room cover, so when the refrigerator-freezer user approaches to open and close the door, the warm air is kept at his feet. There was a problem that it was blown away by me and I felt uncomfortable.

4. On the front machine room cover, a condenser, a suction grill that sucks in air to cool the refrigerator / freezer,
Since the exhaust grill from which the hot air after cooling the condenser and the compressor blows out is close, a short circuit is made between the intake grill and the exhaust grill, and the discharged hot air is sucked in from the intake grill and circulates, There is a problem that the air temperature gradually rises and the cooling effect of the condenser, the compressor, etc. is lowered.

5. The fan motor for cooling the condenser, compressor, etc. is installed so that the fan rotation axis is substantially parallel to the back wall of the refrigerator / refrigerator, and is perpendicular to the intake and exhaust grills of circulating air. . This further increases the resistance to the air flow in the space-saving machine room, resulting in an increase in the input of the fan motor and an increase in the power consumption of the refrigerator / freezer.

[0015]

As a means for solving the above-mentioned problems, the present invention is directed to the depth direction in a machine room of a refrigerator accommodating a plate condenser, a main condenser, an evaporation dish, a compressor and a cooling fan. Install the compressor on the back side of the plate condenser, main condenser, and evaporating dish, etc., and install the cooling fan on the back side of the compressor, and install the back cover on the back side to cool the compressor and condenser. It is designed to be efficient.
Further, as a specific structure, the plate condenser and the main condenser installed on the upper part of the evaporating dish are formed by the plate condenser, and the duct is constituted by these condensers to reduce the ineffective space of the refrigerator / freezer.

Further, the main capacitor has a punched-out notch fin having a hole of at least 4 mm or more at an appropriate position of the plate so that heat can be efficiently radiated. Further, the plate condenser and the main condenser are the air taken in from the suction grill formed in the front machine room cover, and the compressor is the air taken in from the air suction hole provided in the base on which the compressor is placed, and they are forcibly cooled, respectively. Not only the condenser but also the compressor can be cooled well. Further, the plate condenser, the main condenser installed above the plate condenser, and the like form a passage for the air flow to reach the cooling fan, thereby achieving space saving and cost reduction.

Furthermore, the rising pieces of the main capacitor with rising flange are butted against each other to form a ventilation duct, and a special ventilation duct is not required. Furthermore,
A fan cover is provided on the rear cover portion that faces the cooling fan, and the wall is blown even when the refrigerator / freezer is installed close to the wall so that the heated air blown out by the cooling fan is blown out along the rear cover. It is designed so as not to be damaged by air.

Further, a fan cover is provided between the cooling fan and the back cover for partitioning the machine room and the outside, and the mouth ring of the cooling fan is formed by this fan cover to block noise emitted from the machine room. It was designed to do. Further, an air passage for guiding the heating air flowing along the back cover to the exhaust passages provided on both sides of the back of the refrigerator is formed on the back cover so that the heating air discharged from the machine room can be efficiently discharged to the ceiling surface of the refrigerator-freezer. It is the one.

Further, the mouth ring of the cooling fan is formed by the back cover so that an inexpensive refrigerator / freezer can be obtained. Furthermore, in the gap that the back cover and the installation wall make the air in the machine room blown out from the cooling fan,
The back cover is formed so as to lead to the exhaust passages formed on both sides of the back of the refrigerator so that the refrigerator-freezer can be attached to the wall and used.

Further, the shortest length of the hole formed by the caulking notch provided on the thin metal plate is set to 4 mm or more, and the main capacitor is constructed so that the bent portion of the meandering pipe is located in the thin metal. In this way, efficient heat dissipation can be achieved.

Further, the cut-out fins of the main condenser are formed by punching out punched-out cut-out fins between the pipes so that the projected area increases only in the plate thickness with respect to the wind direction from 0 ° to the plate surface. It has an approximately parallel surface with an angle of 45 °, and further has a root rising part of the punched-out notch fin at the center position of the caulking part for fixing the pipe and the caulking part adjacent to the caulking part. The shape of the main capacitor can reduce the ventilation resistance.

Further, the cut-out fins of the main condenser are capable of efficient heat exchange by increasing the number of punched-out cut-out fins on the leeward side relative to the windward side. Further, in the main condenser, the size of the punched-out notch fins is gradually increased on the leeward side with respect to the leeward side to improve the air flow. Further, the main condenser has punched-out notch fins raised inside the plates facing each other to improve heat exchange efficiency.

[0023]

Since the cooling fan is used as a suction type with respect to the compressor on the downstream side of the compressor, the compressor and the condenser are cooled by sucking cooling air from their respective passages. At this time, the cooling air flows in the duct formed by the condenser and so on, so that the main condenser sufficiently exchanges heat with the variously designed notched fins. Also, the heated air blown to the back cover side by the cooling fan is guided to the exhaust passages formed on both sides of the back surface of the refrigerator-freezer body through the air passage formed by the back cover and discharged to the outside of the body. Is.

A substantially full-width condenser of the refrigerator / freezer is arranged on the front side in the machine room, and a compressor and a fan whose rotary shaft is substantially perpendicular to the refrigerator / freezer rear wall are arranged in parallel on the rear side of the refrigerator / refrigerator rear wall, and An air suction hole is provided in the lower part of the compressor on the base supporting the compressor, and a substantially circular or short tubular shape having a center substantially the same as the fan rotation axis at the fan facing portion on the back cover covering the back of the machine chamber. By installing a fan cover equipped with holes and mouth ring and further equipped with an exhaust grill from the rear of the refrigerator / freezer so as to cover the mouth ring of the back cover, the air sucked in by the fan from the front side of the refrigerator / refrigerator can After replacement, it is exhausted rearward from the exhaust grill on the rear fan cover. At this time, the fan motor rotating shaft and the air intake grill and the air exhaust grill are substantially orthogonal to each other, so that the rectifying effect can be enhanced, the resistance added to the air cooling the condenser can be minimized, and the fan motor input can be minimized. In addition, since the capacitor can be installed over substantially the entire width, the heat radiation effect of the capacitor can be sufficiently ensured. Although part of the air after heat exchange with the condenser also works for cooling the compressor, the main cooling of the compressor is performed by the air sucked from the air suction hole on the base at the bottom of the compressor, and the heat dissipation of the condenser is further increased. As a result, the compressor can be sufficiently cooled as a result.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 is a perspective view of a refrigerator-freezer according to an embodiment of the present invention, FIG. 2 is a side view of FIG. 1, FIG. 3 is an explanatory view seen from a plane showing air circulation in a machine room of FIG. 1, and FIG. 1 is a detailed view of a main part of FIG. 1, FIG. 5 is an explanatory view for explaining a cooling system of a compressor, FIG. 6 is a view of a machine room of a refrigerator / freezer according to another embodiment of the present invention as seen from the rear side, and FIG. 6 is a side view of FIG.

In FIGS. 1 and 2, 1 is a box body of a refrigerator-freezer, 2 is a front machine room cover, and has a suction grill 3 for introducing air into the machine room. The front lower end portion of the box body 1 is a front plate 4 having a suction hole 5. 6 is a main condenser, 7 is a plate condenser for evaporating defrost water of a cooler (not shown), 8 is an evaporating dish for storing defrost water, and 9 is a compressor, which is supported on a base 10. . At the bottom of the compressor 9 of the base 10 is an air suction hole 11.
Reference numeral 12 is a fan motor, and 13 is a cooling fan attached to the fan motor 12. 14 is a mouth ring 15
And a fan cover 16 for covering the mouth ring 15 and an exhaust grill 17.

The main capacitor 6 has a bottom plate 18,
Styrofoam 19 for preventing buckling of the box side wall 1a on both sides
In the lower part, the suction duct 20 composed of the evaporation dish 8 is provided.
It is simply surrounded by. The fan motor 12 is installed with the rotating shaft 12a oriented substantially perpendicular to the box back wall 1b, and the mouth ring 15 of the back cover 14 is the rotating shaft 1 described above.
The center is almost the same as 2a. Also, the mouth ring 1
No. 5 spreads in a conical shape toward the back of the refrigerator-freezer. The fan cover 16 is substantially flush with the box back wall 1b. The corner portion 21 where the box body side wall 1a and the box body back wall 1b intersect each other has both corners C so that the exhaust gas from the machine room can be discharged even when the back surface of the refrigerator-freezer is closely attached to the installation surface.
It has a chamfered and bent shape.

In the above structure, as shown in FIGS. 2 and 3, the air sucked from the suction grill 3 on the front machine room cover 2 passes through the suction hole 5 of the front plate 4 and the suction duct 20.
When it is guided into the suction duct 20, it exchanges heat with the main condenser 6, passes through the mouth ring 15, and is exhausted from the exhaust grill 17 (FIG. 3) of the fan cover 16 to the outside of the machine room 2.
2 is released. In addition, as shown in FIG.
The compressor is cooled by the air sucked from the air suction hole 11 above 0, and similarly discharged from the exhaust grill 17 to the outside 22 of the machine room. As a result, the compressor can be cooled more effectively than with the air after heat exchange with the main condenser 6. From the above, it is possible to minimize the ventilation resistance when the air in the machine room flows, minimize the input of the fan motor, reduce the power consumption of the refrigerator / freezer itself, and efficiently dissipate heat from the main capacitor. Is possible.

Next, another embodiment will be described with reference to FIGS. The reference numeral 24 designates the air discharged from the exhaust grill 17 of the fan cover 16 on the surface of the rear cover 14 on the side of the freezer-refrigerator back wall, and the corner portion 2 of the freezer-refrigerator back wall 1b.
It is a guide blade for guiding to 1. The blade tip 24a of the guide blade 24 is formed to be substantially flush with the back wall 1b of the refrigerator-freezer. As a result, even when the freezer-refrigerator is installed with the back wall in close contact with the installation surface, the guide plate 24 allows the exhaust gas to be rectified, and the heat dissipation effect of the condenser is not reduced. Although not shown in the drawing, the heated air guided to the corner portion 21 by the guide blade 24 is exhausted to the upper surface of the refrigerator-freezer through the exhaust heat passage (on the projection surface of the corner portion 21). Further, by connecting the exhaust heat passage and the air passage 25 formed on the back cover, the exhaust passage for the heated air can be surely formed even when the refrigerator-freezer is used by being attached to the wall.

Next, the main capacitor 6 used in the present invention
Will be described in detail. First, in FIGS. 8 to 9, 61 is a heat dissipation plate, 62 is a meandering pipe for refrigerant, 63 is a notch for caulking, and 64 is a notch for caulking. A refrigerant pipe 62 bent in a meandering shape is attached to a heat radiating plate 61 made of a thin metal plate by caulking as shown in FIG. 9 so that most of the pipe is substantially in contact with the bent portion of the meandering pipe. The heat dissipation plate is located in the heat dissipation plate, and after the pipe is crimped, the main capacitor 6 is painted to reduce the contact thermal resistance between the heat dissipation plate and the pipe. Further, the shortest length of the hole 64 formed by the crimping notch provided on the heat dissipation plate is set to 4 mm or more.

With this configuration, the cooling air that hits the main condenser 6 flows along the heat radiation plate 61, and also when hitting the pipe, it passes vertically through the hole 64 formed by the caulking notch. It induces turbulence in the flow and appropriate air, improving heat transfer performance. In addition, since the minimum length of each hole is 4 mm or more, it is extremely difficult for dust to clog, and even if the holes are clogged with dust, most of the heat transfer surface faces the air, and the heat transfer performance will change over time. It rarely drops. Furthermore, since there are no welding points, the energy required for manufacturing is extremely low, which enables cost production.

FIGS. 10 and 11 show an embodiment in which two or more main capacitors 6 are stacked and used, and FIG. 12 shows the heat radiating heat exchanger shown in FIG. 11 installed in the refrigerator body. The cross-sectional view at that time is shown by an arrow with the flow of the cooling air. In the case of stacking two or more sheets in FIG. 10, at least two heat-dissipating plates 61 face each other,
An example is shown in which the pipes 62 contacting the plates are arranged facing each other, and the plates 61 are overlapped with the ends of the plates for heat dissipation aligned with each other with a space of at least 4 mm or more.

The effect of this structure will be described with reference to FIG. 12. Cooling air flowing from the windward side flows along the plates between the plates which are at a high temperature due to the radiation of the plates and the plates. The air flowing on the outside of the plate flows up and down through the hole 64 formed by the caulking notch piece by hitting the pipe, so that the cooling air can effectively flow in and out of the plate. A moderate air turbulence is induced by such a breathing effect, and heat transfer performance can be improved. Further, since the distance between the plates is set to 4 mm or more, dust is extremely hard to collect and there is almost no blockage due to dust, so that heat transfer performance hardly deteriorates with time.

On the other hand, FIG. 11 shows an embodiment in which the windward (right side) end of the heat dissipation plate 61 of the main capacitor 6 shown in FIG.
By displacing the ends of the heat radiating plate in this way, the arrangement of the pipes is arranged in a staggered manner, the turbulence of air due to the above-mentioned breathing effect is further increased, and heat transfer performance can be further improved. . In addition, by shifting the upper end of the wind, the cooling air that hits first will actively enter between the plates through the holes made by the notch for crimping, further induce air turbulence and improve heat transfer performance. be able to.

FIG. 13 shows an embodiment of the main capacitor 6 of the present invention. In FIG. 13, reference numeral 65 denotes a plate cutting portion for folding in half. FIG. 13 shows the pipe 62 at the appropriate position of the heat dissipation plate 61 of the main capacitor 6 described above and the full width of the double-folding plate cutting portion 65 for cutting the plate in the plane direction. Is opened in a direction in which the plates are not arranged by 4 mm or more, and the plates are bent so that the plates are parallel to each other, and the bent side is on the windward side. Main capacitor 6 for
FIG. With such a structure, when using two or more even heat dissipation plates per refrigerator, it is possible to take a very simple two-ply structure without welding pipes or the like. Further, by making the pipe pitches equal to each other, when folding in two, the wind upper end portion inevitably shifts as shown in FIG. 11, and the same effect as that of the embodiment shown in FIG. 11 can be obtained. .

FIG. 14 shows an embodiment of the embodiment in which the left and right ends of the heat dissipation plate of the embodiment shown in FIG. 13 are raised in a flange shape toward the side where there is no pipe contacting the heat dissipation plate. ing. The main condenser 6 shown in FIG. 14 is opened from the plate-cutting portion of the double-folding plate 65 by 4 mm or more between the plates in the direction in which the pipe 62 is not arranged, that is, the direction in which the rising flange 67 rises, Are bent so that they are parallel to each other, and the two sheets shown in the embodiment of FIG. At that time, the rising flange 6
7 are fitted together as shown in FIG. 15, or, as shown in FIG. 16, two heat dissipation plates are superposed so as to abut each other. With such a structure, the rising flange portion not only serves as a strength member as a spacer for maintaining the space between the two heat radiating plates, but also the suction duct that should be formed in the refrigerator main body has the rising flange 6
Since 7 itself forms a part of it, the duct can be formed very easily and at low cost.

FIG. 17 shows an embodiment in which a heat-dissipating plate is provided with a punching-out notch fin having a punching hole having a minimum length of 4 mm or more in the embodiment shown in FIG. Here, 66 is a punch-out notch fin. The punched-out notch fins 66 are set up so that the projected area is increased only by the plate thickness with respect to the wind direction between the pipes.
Further, the punching-out notch fin 66 has a root rising portion at the center position of the caulking portion for fixing the pipe and the caulking portion adjacent to the caulking portion. Further, a plurality of punched-out cutout fins 66 are provided on the plate alone, and the punched-out cutout fins 66 are arranged in a staggered arrangement. An embodiment of a front sectional view of the punched-out notch fin alone is shown in FIGS. 18, 19 and 20. The punched-out notch fin 66 shown in FIG. 18 shows an embodiment in which fins raised from two locations are articulated to form an arch. FIG. 19 is an embodiment showing a fin having a shape obtained by cutting the central portion of the embodiment shown in FIG. FIG. 20 shows an embodiment in which the punching notch fins of the embodiment shown in FIG. 19 have the same upper bending direction. The feature of any of the fins is that the fins have an approximately parallel surface with an angle of 0 ° to 45 ° after being raised from the heat dissipation plate and then bent.

With this structure, the cooling air flowing along the surface of the heat dissipation plate is divided by the punched notch fins. That is, since the velocity boundary layer of the cooling air is divided, the temperature boundary layer is divided, and the heat transfer performance can be improved. The minimum length of the punched hole is 4m
Since it is set to m or more, it is very difficult for dust to adhere, and there is almost no blockage due to dust, so that the heat transfer performance hardly deteriorates with time.

FIG. 21 shows an embodiment in which the size of the punched-out notch fins in the embodiment shown in FIG. 17 is larger on the leeward side than on the leeward side. Here, 66a indicates a windward punched out notch fin,
b shows the leeward punched-out cutout fins, and in this embodiment, the leeward punched-out cutout fins of 66a have a larger width than the leeward punched-out cutout fins of 66b. An example is shown in which the size is reduced each time. In addition, the number of punched-out notch fins is larger than that on the leeward side.

With such a structure, the number of holes such as fins is smaller on the upstream side than on the downstream side, and the upstream side becomes the downstream side due to foreign matters such as dust carried along with the cooling air. On the other hand, since it is not blocked first, even if the main capacitor is clogged with dust or the like, the degree to which the heat transfer performance changes with time can be reduced.

FIG. 22 shows the flow of cooling air when the main condenser 6 is installed in the refrigerator body, and FIG. 23 shows the velocity boundary layer. The effect of such a structure will be described with reference to FIG. 22. The cooling air flowing from the windward side is radiating from the heat radiating plate 61 and the heat radiating plate 61, and the heat radiating plate 6 has a high temperature.
From the hole 64 created by the punched cutout fins 66 or the caulking cutout pieces 63 while flowing along the heat dissipation plate 61 between the 1 and hitting the fin 66 parallel to the plate raised inside It flows out to the outside of the heat dissipation plate 61. Further, the air flowing outside the heat dissipation plate 61 collides with the pipe and flows vertically through the holes 64 formed by the caulking notch pieces or the holes formed by the punched notch fins 66, which results in a result. In addition, cooling air flows in and out of the heat dissipation plate. The appropriate air turbulence due to the breathing effect is induced more than in the embodiment shown in FIG. 12, and the heat transfer performance can be improved. Further, as shown in FIG. 23, the cooling air flowing along the plate surface is divided by the punched notch fins. That is, since the velocity boundary layer of the cooling air is divided, the temperature boundary layer is divided, and the heat transfer performance can be further improved.

Further, the minimum length of the holes between the heat dissipation plates 61 and the caulking cutout pieces, the holes formed by the punched-out cutout fins, etc. is set to 4 mm or more, so that it is very difficult for dust to adhere and dust. Since there is almost no blockage, the heat transfer performance hardly deteriorates with time. The main capacitor 6 according to the present invention described above does not have a large initial performance difference as compared with the wire capacitor, has less dust adhesion, can reduce performance deterioration over time, and can be manufactured at low cost in a refrigerator. 6 can be provided.

[0043]

As described above, according to the present invention, the cooling fan is used in the suction type with respect to the compressor on the downstream side of the compressor, and the compressor and the main condenser are cooled from their respective passages. It sucks in the working air and is cooled. In other words, in addition to the air that has passed through the main condenser, the compressor is cooled by the fresh air that is sucked in through the air suction holes that are opened in the bottom surface of the base, etc.
Further, the cooling of the compressor is performed efficiently by solving the problems described in the above problems. In addition, by installing the cooling fan close to the back cover,
The back cover can be used to exhaust the heated air blown out from the cooling fan.

In addition to the above, by forming as claimed in claims 2, 3, 4, 5 and 6, a cold air duct can be constructed without preparing a special duct or the like and the space in the machine room can be effectively utilized. That is, a significant cost reduction can be obtained. In addition to the above, according to the seventh, eighth and ninth aspects, not only the back surface of the freezer-refrigerator having a flat back surface with a sense of unity can be obtained, but also the freezer-refrigerator without the stain on the wall can be obtained. Further, by forming as described in claims 12 to 16, an efficient main capacitor can be obtained.
It is possible to obtain various effects such as.

[Brief description of drawings]

FIG. 1 is a perspective view of a refrigerator-freezer according to an embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is an explanatory view seen from a plane showing the flow of air in the machine room of FIG. 1.

FIG. 4 is a detailed view of an essential part of FIG.

FIG. 5 is an explanatory diagram illustrating a cooling method of a compressor.

FIG. 6 is a rear view of a machine room of a refrigerator-freezer according to another embodiment of the present invention.

FIG. 7 is a side view of FIG.

8A and 8B are a top view and a front view of a main part of the main capacitor according to the embodiment.

FIG. 9 is a side view of a main portion of a caulking portion of the main capacitor according to the embodiment.

FIG. 10 is a side view of a main part of the main capacitor according to the embodiment.

FIG. 11 is a side view of a main part of the main capacitor according to the embodiment.

FIG. 12 is a side view of a main portion of the main capacitor according to the embodiment.

FIG. 13 is a top view of the main parts of the main capacitor of the embodiment.

14A and 14B are a top view and a front view of a main part of the main capacitor according to the embodiment.

FIG. 15 is a perspective view of a main part of the main capacitor according to the embodiment.

FIG. 16 is a perspective view of a main part of the main capacitor according to the embodiment.

17A and 17B are a top view and a front view of a main part of the main capacitor according to the embodiment.

FIG. 18 is a cross-sectional view of main parts of the main capacitor of the embodiment.

FIG. 19 is a cross-sectional view of the main parts of the main capacitor of the example.

FIG. 20 is a cross-sectional view of main parts of the main capacitor of the embodiment.

FIG. 21 is a top view of a main part of the main capacitor of the embodiment.

FIG. 22 is a side view of a main portion of the main capacitor according to the embodiment.

FIG. 23 is a side view of a main portion of the main capacitor according to the embodiment.

FIG. 24 is a perspective view of a machine room of a conventional refrigerator-freezer.

FIG. 25 is an explanatory view seen from a plane showing the flow of air in the model room of FIG. 24.

[Explanation of symbols]

1 ... Freezer / refrigerator box, 2 ...
・ Front machine room cover, 3 ... suction grill,
4 ... front plate, 5 ... suction port,
6 ... Main capacitor, 7
... Plate capacitors, 8 ...
Evaporating dish, 9 ... Compressor,
10 ... Base, 11 ... Air suction hole,
12 ... Fan motor, 13 ... Cooling fan, 14 ... Back cover, 15 ... Mouth ring, 1
6 ... Fan cover, 17 ... Exhaust grill,
18 ... Bottom plate, 19 ... Styrofoam for buckling prevention, 20 ... Suction duct, 2
1 ... Corner, 22 ...
・ Outside the machine room, 23 ... Inside the machine room,
24 ... Guide blade, 25 ... Air passage, 61
... Heat dissipation plate, 62 ... Refrigerant meandering pipe, 63 ... Caulking notch,
64 ... Caulking notch hole, 65 ...
Half-fold plate cutting part, 66 ... Notch fins, 66a ... Windward side punching-out notch fins, 66b ... Downwind side punching-out notch fins, 6
7 ... Rising flange.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Susumu Yamazaki 800 Tomita, Ohira Town, Shimotsuga-gun, Tochigi Prefecture Hitachi Ltd. Living Equipment Division

Claims (16)

[Claims] 1. A plate capacitor, a main capacitor,
In the machine room of the refrigerator containing the evaporating dish, the compressor, and the cooling fan, the plate condenser,
A refrigerator machine room structure characterized in that a compressor is installed on the back side of the main condenser, the evaporation tray, etc., a cooling fan is installed further on the back side of the compressor, and a back cover is installed on the back side. 2. The machine room structure for a refrigerator according to claim 1, wherein the plate condenser and the main condenser installed above the evaporation dish are formed of a plate condenser. 3. The machine room structure for the refrigerator according to claim 1, wherein the main capacitor has punched-out notched fins having holes of at least 4 mm at appropriate positions on the plate. 4. The plate condenser and the main condenser are air taken in from a suction grill formed in the front machine room cover, and the compressor is air taken in from an air suction hole provided in a base on which the compressor is mounted. The mechanical room structure of the refrigerator according to claim 1, wherein the mechanical room structure is forcibly cooled. 5. The plate condenser, the main condenser installed above the plate condenser, and the like form a passage for an air flow to reach the cooling fan.
Machine room structure of the refrigerator described. 6. The refrigerator's machine room structure according to claim 1, wherein the rising pieces of the main capacitor with rising flange are butted against each other to form a ventilation duct. 7. The refrigerator according to claim 1, wherein a fan cover is provided on a rear cover portion facing the cooling fan, and heated air blown by the cooling fan is blown out along the rear cover. Machine room. 8. A refrigerator according to claim 1, wherein a fan cover is provided between the cooling fan and the back cover to partition the machine room from the outside, and the mouth ring of the cooling fan is formed by the fan cover. Machine room structure. 9. A refrigerator mechanical room structure according to claim 1, wherein an air passage for guiding heated air flowing along the rear cover to exhaust passages provided on both sides of the rear cover is formed in the rear cover. 10. The machine room structure of the refrigerator according to claim 1, wherein the mouth ring of the cooling fan is formed by a back cover. 11. A rear cover is formed so as to guide the air in the machine room blown out from the cooling fan to the exhaust passages formed on both sides of the rear surface of the refrigerator in the gap formed by the rear cover and the installation wall. The machine room structure of the refrigerator according to claim 1. 12. The main capacitor is configured such that the shortest length of the hole formed by the caulking notch provided in the thin metal plate is 4 mm or more and the bent portion of the meandering pipe is located in the thin metal plate. The machine room structure for a refrigerator according to claim 1, wherein: 13. The notch fin of the main capacitor is
Launch a punched out notch fin between the pipes in the wind direction so that the projected area increases only by the plate thickness.
The plate surface has an approximately parallel surface with an angle of 0 ° to 45 °, and further the caulking part for fixing the root rising part of the notched fin of the punching to the pipe and the caulking part adjacent to the caulking part. The machine room structure for a refrigerator according to claim 3, wherein the machine room structure has a shape at a central position of the portion. 14. The notch fin of the main condenser is
The machine room structure of the refrigerator according to claim 3, wherein the number of punched-out notch fins is increased sequentially from the leeward side to the leeward side. 15. The machine room structure for a refrigerator according to claim 3, wherein the main condenser is such that the size of the punched-out notch fins is made larger on the leeward side than on the leeward side. 16. The machine room structure for a refrigerator according to claim 3, wherein the main capacitor has punched-out notch fins raised inside the plates facing each other.