JP3518906B2 - Freezer refrigerator - Google Patents

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 refrigerator / freezer which circulates cold air in a refrigerator .

[0002]

2. Description of the Related Art As an example of a conventional cold air circulating fan device for a refrigerator / freezer, as disclosed in Japanese Patent Laid-Open No. 4-9565, a device installed at the back of a box is a boss for a fan. The core plate and casing side plate on the side of the fan are usually flat plates, and sufficient consideration should be given to improvements such as workability in assembling and repairing the fan and casing itself, improvement in the effective food storage internal volume, and improvement in fan performance. Was not.

Japanese Patent Publication No. 6-13880 discloses that
Although this is an example described as a blower, when this is used in a refrigerator-refrigerator, when the fan is attached to the rotation shaft of the fan motor, the rotation shaft cannot be seen by the fan, and the rotation shaft is thin. Since the shaft hole into which the rotary shaft is fitted is small, it is difficult and difficult to mount the fan on the rotary shaft. In addition, there is a problem that the heat generated by the fan motor enters the inside of the refrigerator as it is and the cooling performance is deteriorated.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the technique described in Japanese Patent Publication No. 5 publication, the core plate of the centrifugal fan suddenly diverts the flow of the air flowing in along the rotation axis direction in the centrifugal direction, which deteriorates the performance of the fan, and also the core plate. Since the back of the fan casing is flat,
There was a problem that the fan motor could not be installed close to the fan.

Further, in the technique described in Japanese Patent Publication No. 6-13880, since the motor body is directly supported on the back surface of the centrifugal fan casing, the heat of the motor is directly sucked into the inside temperature of the refrigerator. The motor is raised, and the motor is not closed, which may cause a fire at the time of failure. Further, at the time of assembling, a search work is required to match the fan shaft hole to the motor shaft, or the suction side of the centrifugal fan, that is, between the blade tip surface on the opening side and the bell mouth of the front plate, There were problems such as short circuits caused by weak discharge flow and strong suction flow, and the problem of wind noise when the wind flowed into the blades, but the improvement measures to prevent this were not sufficient. .

Further, regardless of the above-mentioned prior art, since the fan rotates inside the casing, considering the deformation of the box body of the refrigerator / freezer, the variation in dimensions, and the dew around the fan, the fan and the casing are In order to prevent contact and deterioration of performance by taking a large distance,
In addition to requiring distance management work, it has been strongly desired to make the fan unit thin.

A first object of the present invention is to solve such problems, it can also be performed without looking at the operation of mounting the fan in the eye, which make it possible to facilitate the assembling work cold
To provide a freezer refrigerator .

A second object of the present invention is to provide a freezer-refrigerator which is made thin so that the effective storage internal volume can be increased without enlarging the size of the freezer-refrigerator main body.

A third object of the present invention is to provide a refrigerating and refrigerating system capable of improving performance such as an increase in air flow of the fan and noise reduction.
It is to provide a warehouse .

[0010]

In order to achieve the above first object, the present invention provides a dent portion which is recessed in the central portion of the back face of a centrifugal fan with a smooth surface and protrudes from the front face of the core plate. Is provided, and the tip of the dent is connected to the shaft hole of the boss with a smooth surface without a step.

In order to achieve the above-mentioned second object, the present invention is such that the back plate of the casing for accommodating the centrifugal fan is provided on the back face of the back plate so as to be along the recessed portion in the core plate of the centrifugal fan. A recess is provided so as to protrude from the front surface of the rear plate so that the recess of the back plate faces the recess of the core plate of the centrifugal fan, and one end of the fan motor is supported in the recess of the back plate. Further, a rear dent is provided in the middle of the axial tip surface of the blade of the centrifugal fan, and the tip of the bell mouth around the air suction opening of the front plate of the casing is opposed to the rear dent.

In order to achieve the above-mentioned third object, the present invention is such that the front surface (blade-side surface) of the core plate of a centrifugal fan also has a tapered central portion in accordance with the recessed portion on the rear surface thereof. The tip of the boss is followed by the boss, and the inner peripheral side of the tip of the blade in the axial direction is formed with a tapered portion directed to the side for taking in cool air, and the tip of the bell mouth is formed in the rear recessed portion of the wing. The diameter of the opening at the tip of the bell mouth is made larger than the inner diameter of the fan by approaching. Further, the outer peripheral tip end of each blade is fixed to a single ring-shaped rotary shroud, and a ring-shaped inner flange is provided on the inner surface of the front plate of the casing so as to sandwich the bell mouth and the rotary shroud.

In order to achieve the third object, the present invention makes the cross-sectional shape of the blade thicker from the inner circumference to the outer circumference, and makes the outer peripheral end face of the blade have a circumferential width. Enlarge.

[0014]

[Operation] When the rotary shaft of the fan motor is inserted from the recessed portion provided on the back surface of the core plate of the centrifugal fan, the rotary shaft is guided by the recessed portion of the smooth surface into the shaft hole of the boss portion, and the centrifugal fan is When the rotary shaft is attached to the rotary shaft, the rotary shaft is naturally guided and fitted into the shaft hole of the boss portion even if the rotary shaft cannot be seen by the centrifugal fan.

Since the core plate of the centrifugal fan and the back plate of the casing are provided with the indented portions which face each other and project forward, the position of the axial center of the centrifugal fan with respect to the casing is defined, and the centrifugal fan and The distance to the fan motor becomes smaller. Further, also in the front plate of the casing, since the tip of the bell mouth of the front plate is opposed to the rear concave portion of the axial front end surface of each blade, the space between the centrifugal fan and the casing front plate can be reduced. From the above, the cold air circulation fan device for the refrigerator / freezer can be made thin, and the internal volume of the food storage of the refrigerator / freezer can be expanded accordingly.

Since the front face of the core plate of the centrifugal fan projects forward with a smooth surface, the flow of cold air entering from the front face of the centrifugal fan is smoothly changed in the centrifugal direction of the centrifugal fan. A rear recess is formed in the middle of the axial tip surface of the blade, the tip of the bell mouth faces the rear recess, and a tapered portion is formed on the inner diameter side of the blade axial end surface. By making the diameter of the opening at the tip of the bell mouth larger than the diameter of the inner peripheral side of the blade, there is no difficulty in inflowing the cool air into the casing, and the effective axial width of the axial blade that substantially discharges becomes large. And efficient air flow can be obtained, and pressure leakage (short circuit) can be prevented.

Further, since the blade becomes thicker toward the outlet side (outer peripheral side), it is possible to suppress the occurrence of turbulence in the flow due to the expanded flow of cold air between the blades. Since the width of the blade in the circumferential direction is increased, the connection strength between the blade and the rotating shrout is increased.

Further, an inner flange provided on the inner surface side of the front plate of the casing or a bell mouth having an arc-shaped cross section,
This prevents backflow that tends to be directed to the suction port side that tends to occur at the tip end side of the blade in the axial direction. Further, the dent portion of the core plate of the centrifugal fan and the circumferential width blowout portion of the outer periphery of the blade improve the impeller strength. Further, the recessed portion of the rear plate of the rear casing, the ribs for supporting the anti-vibration rubber, the inner flange of the front casing, and the bell mouth improve the strength of the casing. Further, by supporting the fan motor on the back plate of the casing, the accuracy of alignment between the centrifugal fan and the casing is improved.

Furthermore, since the back plate of the casing is also used as the closing plate of the fan motor housing, the heat generated by the fan motor is less likely to enter the refrigerator and the safety is improved. Also, since one end of the fan motor is supported inside the recess of the back plate,
The rotation axis of the fan motor can be shortened, and the center of gravity of the centrifugal fan approaches the fan motor side.
At the same time as reducing the vibration, the fan device including the fan motor can be made thinner.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a cold air circulation fan for a refrigerator / freezer according to the present invention.
FIG. 1 is a longitudinal sectional view of an essential part showing an embodiment of a built-in refrigerator / freezer , wherein 1 is a box body of the refrigerator / freezer, 2 is a freezer compartment, 3 is a refrigerating compartment, 4 is a partition hot wall, 5 is a ceiling heat insulating wall, 6 Is a rear heat insulation wall, 7 is a left side wall, 8 is a cooler, 9 is a defrost water saucer, 1
0 is a centrifugal fan, 11 is a blade, 12 is a core plate, 12a is a boss portion, 13 is a rotary shun, 14 is a shaft hole, 15 is a rear recessed portion, 16 is a tapered portion, 17 is a guard, 18 is a casing, 18a is a front casing, 18aa is a front plate, 1
8ab is a bell mouth, 18ac is a spiral part, 18ad is an inner flange, 18b is a rear casing, 18bb is a back plate,
18bc is a spiral part, 18bd is a ring-shaped rib, 18be
Is a pin, 18bf is a protrusion, 19 is a fan motor, 19
a is a rotary shaft, 19b is a bracket, 20 is a vibration-proof rubber, 2
Reference numeral 1 is a rear support, 22 is a mounting member, 23 is an air passage partition plate, and 24 and 25 are cold air return air passages.

In FIG. 1, there is a door (not shown) of the refrigerator / freezer on the left side of the drawing, and this direction is hereinafter referred to as the front side or the front side, and the right side of the drawing is referred to as the rear side or the back side or the rear side. Also, the front surface of each member is called the front surface,
The rear surface is called the rear surface or the back surface.

In the refrigerator / freezer, a box body 1 is composed of a ceiling heat insulating wall 5, a back heat insulating wall 6, a left side wall 7, a right side wall (not shown), and the above door. The freezer compartment 2 is formed in the upper part, and the refrigerating compartment 3 is formed under it. The freezing compartment 2 and the refrigerating compartment 3 are partitioned by a partitioning hot wall 4.

The interior of the freezer compartment 2 is partitioned by an air passage partition plate 23 and a guide 17 to form an air discharge flow region, and the casing 18 and the rear support 2 are formed in this region.
1, a cold air circulation fan including a fan motor 19 and a centrifugal fan 10 directly connected thereto is installed. Further, in the air discharge flow region, a cooler 8 is installed below the casing 18, and a partitioning heat wall 9 below the cooler 8 is connected to the discharge flow region to form a defrost water receiving tray 9 Are formed. Then, the freezing chamber 2 is provided between the defrosting water receiving tray 9 and the cooler 8 via the cold air return air passage 24 provided on the partition hot wall 9, and also the cold air return air passage provided on the partition hot wall 9. The defrosting water receiving tray 9 is connected to the refrigerator compartment 3 via
And the cooler 8 are in communication with each other.

The casing 18 is formed by combining a front casing 18a and a rear casing 18b. The centrifugal fan 10 is housed in an internal space formed by the casing 18 and a rear support member attached to the rear surface of the rear casing 18b. The fan motor 19 is housed in the space inside 21. Here, the casing 18 is fixed to the surface of the rear heat insulating wall 6, and the rear support 21 is housed in the recess formed in a part of the rear heat insulating wall 6.

The front casing 18a comprises a front plate 18aa having a circular opening in the center and a flat outer surface, and a spiral side plate 18ac integrated along the edge of the rear surface thereof. That is, the side plate 18ac forms a frame having a shape along a part of the spiral, and the frame is integrated with the edge of the back surface of the front plate 18aa. Therefore, the outer diameter of the front plate 18aa also has a shape along the spiral side plate 18ac. A bell mouth 18ab is formed by bending a side portion of the opening of the front plate 18aa inwardly in a curved shape. Further, an inner flange 18ad is formed on the inner surface of the front plate 18aa so as to be concentric with the opening. An air passage partition plate 23 is coupled to the upper part of the opening of the front plate 18aa.

The rear casing 18b also has a dent in the center, but is composed of a flat back plate 18bb and a spiral side plate 18bc integrated with the back plate 18bb. This side plate 18bc
Also has a spiral shape of the same shape as the spiral side plate 18ac of the front casing 18a, but is slightly smaller than the spiral side plate 18ac, and is fitted into the spiral side plate 18ac. In such a fitted state, the protrusion 18bf provided on the outer surface of the spiral side plate 18bc engages with the hole provided in the spiral side plate 18ac , whereby the front casing 1
8a and the rear casing 18b are firmly connected. The back plate 18bb is wider than the spiral side plate 18bc, and is fixed to the back heat insulating wall 6 at a portion outside the side plate 18bc. Further, the dent at the central portion of the back plate 18bb is dented such that the peripheral surface thereof has a smooth curved shape like a trumpet shape or a bell shape, and the inside of the dent is flat. The opening is provided.

A pin 18be is provided on the outer surface of the back plate 18bb.
Is provided, and the pin 18be is attached by engaging a bottomed substantially cylindrical rear support member 21. A fan motor 19 is provided in the rear support tool 21, and is directly connected to the fan motor 19 in the casing 18.
0 is provided.

A ring-shaped rib 21a is formed in the center of the bottom inside the rear support 21 having a substantially bottomed cylindrical shape.
Mounting member 2 mounted on the back side of the fan motor 19
2 is fitted into the ring-shaped rib 21a via the ring-shaped vibration- proof rubber 20b . In addition, a ring-shaped rib 18bd is also formed in a central flat portion of a recess in the central portion of the back plate 18bb in the casing 18, and a ring-shaped anti-vibration rubber 20a is interposed in the ring-shaped rib 18bd.
The bracket 19b of the fan motor 19 is fitted. In this way, the fan motor 19 is connected to the rear plate 18b.
b and the rear support 21. The rotating shaft 19a of the fan motor 19 projects into the casing 18 through an opening provided in a central flat portion of a recess in the central portion of the back plate 18bb of the casing 18.

The centrifugal fan 10 has a casing 18 on the back side.
Has a dent portion that is flat facing the back plate 18bb and has a smooth central portion that is dented into a trumpet shape or a bell shape. The dent portion causes the front surface to project forward,
It is composed of a core plate 12 connected to the boss portion 12a and a plurality of blades 11 attached to the peripheral portion of the core plate 12 perpendicularly thereto. The shaft hole 14 provided in the boss portion 12a is connected to the recessed portion of the core plate 12 by a smooth surface, and the rotary shaft 19a of the fan motor 19 is connected to the shaft hole 14 by a smooth surface.
Is inserted and fixed. Rotating shaft 19 of fan motor 19
a corresponds to the central axis of the opening serving as the cool air suction port provided in the front plate 18aa of the casing 18, and the diameter of this opening (therefore, the diameter at the tip of the bell mouth 18ab).
Is slightly smaller than the diameter of the centrifugal fan 10.

The dent portion of the core plate 12 is substantially parallel to the central dent portion of the rear plate 18bb of the casing 18, and the central dent portion of the rear plate 18bb faces the dent portion of the core plate 12. And some have entered.

FIG. 2 is an enlarged cross-sectional view showing the periphery of the boss portion of one specific example of the centrifugal fan 10 in FIG. 1, in which 12b is a crack groove, 14a is an inlet of the shaft hole 14, 14b is a small diameter portion, and 19c. Is a small diameter portion , and 26 is a coil spring, and the portions corresponding to those in FIG.

In the figure, the core plate 12, the boss portion 12a and the blade 11 (FIG. 1) are integrally molded of resin. The inner surface of the heart plate 12, while any vertical cross-section thereof in an arc of radius R _2, the boss portion 12a with a smooth curved bell
To the inlet 14a of the shaft hole 14, there is no flat portion at least near the shaft hole 14, and the recessed portion of the core plate 12 is connected to the shaft hole 14 with a smooth surface without a step. However, the inner surface of the core plate 12 does not necessarily have to have such an arc, and may be a smooth curved surface such as a trumpet shape. The diameter of the end of the shaft hole 14 is slightly smaller than the diameter of the inlet 14a and is tapered. Moreover, the diameter of the shaft hole 14 is equal to that of the inlet 14a.
The diameter is equal to the diameter of the fan motor shaft 19a in the portion, and slightly smaller than the diameter of the fan motor shaft 19a in the end portion,
A small diameter portion 14b having a smaller diameter than the end portion is provided in an intermediate portion between the inlet 14a and the end.

The outer surface of the core plate 12 is also parallel to the inner surface, and the outer diameter d _{1 of the} tip of the boss 12a is smaller than the outer diameter d ₂ at the joint with the core plate 12. , Tapering. A crack groove 12b having a width S substantially equal to the length of the boss portion 12a is provided in the axial direction from the tip of the boss portion 12a, whereby the tip of the boss portion 12a is divided into two.

On the other hand, although the rotary shaft 19a of the fan motor 19 has a constant diameter, the diameter of the rotary shaft 19a is partially reduced on the tip side thereof, and the length is equal to the length of the small diameter portion 14b of the boss portion 12a in the axial direction. Is provided with a small diameter portion 19c .

When the rotary shaft 19a is attached to the centrifugal fan 10, the rotary shaft 19a is introduced into the shaft hole 14 of the boss 12a by using the inner surface of the recessed portion of the core plate 12 as a guide.
Insert from. In this case, the shaft hole 14 is slightly tapered as described above, and the small diameter portion 14b is partially provided, but as the rotary shaft 19a is inserted into the shaft hole 14, the boss portion 12a of the boss portion 12a is formed. The two parts divided by the crack groove 12b are pushed outward, and the crack groove 12b expands. Then, the small diameter portion 19c of the rotating shaft 19a is fitted into the small diameter portion 14b of the shaft hole 14, and the rotating shaft 19a is fixed to the boss portion 12a and positioned. In this case, the two divided portions by the split groove 12b at the tip of the boss portion 12a are widened, and the return force thereof holds the rotary shaft 19a. Even in such a state, the boss portion 12
a is slightly tapered when viewed from the side of the core plate 12, and by inserting the coil spring 26 from the tip of the boss portion 12a and pushing it into the small diameter portion 14b of the shaft hole 14, the boss portion 12a is cracked. 2 divided by groove 12b
The two parts are tightened to increase the fixing strength of the rotating shaft 19a to the core plate 12.

With the above configuration, in FIG. 1, the centrifugal fan 10 and the fan motor 19 are directly connected.

FIG. 3 is a partially enlarged sectional view showing the outer peripheral portion of the centrifugal fan 10 in FIG. 1 and the portion of the front plate 18aa facing it, and the portions corresponding to those in FIG. 1 are designated by the same reference numerals. .

In the figure, the edges of the tips of each blade 11 are
A rear semi-circular recessed portion 15 is provided, and the center of the rear recessed portion 15 passes through the middle of the chord length C of the blade 11 (or the average diameter D of the outer diameter D2 and the inner diameter D1 of the centrifugal fan 10).
c)). The curling tip of the bell mouth 18ab provided on the front plate 18aa faces the rear recessed portion 15, and the diameter Dm of the curling tip of the bell mouth 18ab is substantially equal to the average diameter Dc. Note that Db
Is the outer diameter of the core plate 12.

Below the rear recess 15 at the tip of the wing 11, the curling tip of the bell mouth 18ab is substantially flush with the curling tip, and more specifically, slightly forward (air A tapered portion 16 is formed so as to project toward the suction side), and this is the most distal end of wind intake. Also,
Similarly, the upper side of the rear indented portion 15 at the tip side of the wing 11 also projects on the substantially same plane perpendicular to the curling tip of the bell mouth 18ab and the rotation axis, more specifically, slightly forward. .

The outer periphery of the tip of each blade 11 is fixed to the inner surface of the same ring-shaped rotary shroud 13 (see FIG. 4). As a result, each wing 11 is integrated. The inner flange 18ad of the front plate 18aa is formed on the ring outside the rotary shroud 13, and the height of the inner flange 18ad is set to cover the rotary shroud 13.
The rotating shroud 13 is positioned between the ab and the ab.

FIG. 5 shows the blade 1 of the centrifugal fan 10 in FIG.
It is a figure which shows the cross-sectional shape of 1 and arrangement | positioning relationship, and attaches | subjects the same code | symbol to the part corresponding to the above-mentioned drawing.

In the figure, when the direction of rotation of the centrifugal fan 10 is the direction of arrow N, the cross-sectional shape of the blades 11 forms a pressure surface that is recessed in the direction opposite to the direction of rotation N, and is located from the center of the centrifugal fan 10. It is attached so as to be inclined to the side opposite to the rotation direction N by an angle θ with respect to the radiation. The direction of the outer peripheral end of the blade 11 is a substantially radial radial blade.

With this configuration, when the centrifugal fan 10 rotates in the direction of the arrow N, air flows from the center to the outside in the drawing, but the intervals between the adjacent blades 11 are not uniform, and the air inflow side W1. Since the outflow side W2 is larger than the outflow side W2, it is suitable for a refrigerator-freezer as a high static pressure type, a high speed type, and low noise.

Further, in the case of a conventional fan with a forward-tilted blade, the thickness of the inflow side is increased and the outflow side is narrowed to have a streamlined shape. From the side toward the outer peripheral direction, and becomes larger, and a flat surface along the fan circumferential direction at the outer peripheral outlet end than the inner peripheral side wind inlet end roundness t1 (strictly, this surface of each blade 11 is The width dimension t2 of a part of the same cylindrical surface) is increased. As a result, as is clear from FIG. 4, the wing 11
The contact surface with the rotating shroud 13, which is integrally connected at the tip, is enlarged.

FIG. 6 is a sectional view taken along the section line A--A in FIG. 1, where 27 is a discharge duct and 28 is a communication duct for a refrigerator, and the parts corresponding to those in FIG. There is. In the figure, the casing 18 accommodating the centrifugal fan 10 is connected to a discharge duct 27. An opening is provided on a side surface of the discharge duct 27 facing the guide 17 (FIG. 1), and the discharge duct 27 is provided on the communication duct 28 for the refrigerator and the partition hot wall 4 shown in FIG. 1. It leads to the refrigerator compartment 3 of FIG.

Although this embodiment has the above configuration,
When the centrifugal fan 10 is rotated in the direction of arrow N (FIG. 5) by the drive of the fan motor 19, the air in the freezer compartment 2 passes through the cool air return air passage 24 and the air in the refrigerating compartment 3 passes through the cool air return air passage 25, respectively. After being cooled in the vessel 8, it is sucked into the casing 18 through the air passage partitioned by the air passage partition plate 23 from the opening formed by the bell mouth 18ab, and the centrifugal fan 1
0 from the casing 18 to the discharge duct 27 in FIG. A part of the low-temperature air discharged to the discharge duct 27 is sent into the freezer compartment 2 from the opening (not shown) on the side surface of the discharge duct 27 through the guide 17 in FIG. The rest of the low temperature air discharged to the discharge duct 27 in FIG. 6 is sent to the refrigerating chamber in FIG. 1 as shown by an arrow b.

In this way, the air in the freezing compartment 2 and the air in the refrigerating compartment 3 are circulated, and each time the air is chilled by the refrigerator 8, the cooled air becomes a low temperature and the freezing compartment 2 and the refrigerating compartment 3 are cooled. Sent to.

In this embodiment described above, the cold air circulation path is almost the same as the conventional refrigerator-freezer, but the following effects can be obtained.

First, the core plate 12 of the centrifugal fan 10 is first of all.
The rear surface of the rotary shaft 19a extends from the outer peripheral side where the blades 11 are formed to the shaft hole 14 in the central portion, and is provided with a dented portion that is gradually recessed forward in the shape of a trumpet or a bell. The tip of the rotary shaft 19a slides on the inner surface of the recessed portion so as to naturally coincide with the shaft hole 14, and the centrifugal fan 10 causes the rotary shaft 1 to rotate.
Even if 9a is hidden and cannot be seen, the work of attaching the centrifugal fan 10 to the fan motor 19 becomes very easy.

When the centrifugal fan 10 is attached to the rotary shaft 19a, the inner surface of the shaft hole 14 is tapered so that the tip diameter of the shaft hole 14 is slightly smaller than the outer diameter of the rotary shaft 19a. In addition, the boss 12a has a crack groove 12b.
Due to this, the tip of the shaft hole 14 is forcibly opened, and the rotating shaft 19a is tightened by the restoring force, and further, the rotary shaft 19a and the small diameter part 14b in the middle part are rotated. The small diameter portion 19c of the shaft 19a is fitted,
It is managed to a predetermined amount of insertion dimension and position.

Further, by mounting the coil spring 26 on the outer periphery of the boss portion 12a, the centrifugal fan 10 is mounted on the rotary shaft 1.
It can be easily and sufficiently fixed to 9a.

Second, the fan device can be made thinner. In other words, the rear plate 18bb of the rear casing 18b is also formed with a recessed portion substantially conforming to the shape of the recessed portion on the back surface of the core plate 12, and the recessed portion is inserted into the recessed portion on the back surface of the fan core plate 12. Since the fan motor 19 is attached so that the bracket 19b of the fan motor 19 is inserted into the recessed portion of the back plate 18bb, the rear end of the centrifugal fan 10 and the front end of the bracket 19b of the fan motor are connected to each other. Can be approached to the same plane perpendicular to the axis of rotation or beyond. As a result, the centrifugal fan 10 and the fan motor 19 are arranged very close to each other,
The thinness of the fan device can be achieved.

Further, on the axial tip side of the blade 11 of the centrifugal fan 10, a rear recess 15 is provided in the middle of the tip surface,
The tip of the bell mouth 18ab of the front casing 18a is inserted into the rear recessed portion 15, whereby the centrifugal fan 10 and the front plate 18 of the front casing 18a are inserted.
The distance from aa can be made small. This also reduces the overall thickness of the fan device.

As described above, the fan device can be made thin, but as a result, the effective internal volume of the freezer compartment 2 can be increased. By the way, in this embodiment, for example, if the height of the freezing compartment is 500 mm and the width is 600 mm, the width of the casing 18 can be reduced by 10 mm, which results in an improvement in the internal volume of 3 liters.
It also leads to resource saving.

Further, when assembling the fan device,
The position of the rotating shaft 19a of the fan motor 19 is defined by inserting the supporting vibration isolating rubber 20 into the rear casing 18b, and the position of the centrifugal fan 10 with respect to the rotating shaft 19a rotates with the small diameter portion 12b of the boss portion 12a. It can be easily defined by the position design of the small diameter portion 19b of the shaft 19a.

Furthermore, after the centrifugal fan 10 is fixed to the rotating shaft 19a, the front casing 18a covers the outer periphery of the rear casing 18b from the front in a lid-like manner.
The side end of the spiral portion 18bc of 8b is applied to the front plate 18aa of the front casing 18a, and at the same time, the spiral pin 18 of the rear casing 18b is attached to the spiral portion 18ac of the front casing 18a.
It is only necessary to engage bf, the work is very simple, and the position of the bell mouth 18ab with respect to the centrifugal fan 10 is accurately defined, so that a thin fan device can be easily assembled.

Thirdly, first, the core plate 12 of the centrifugal fan 10 is
The front surface of the fan, that is, the inner surface of the fan, has a shape in which a gentle curved surface is drawn with the boss portion 12a as the apex and spreads to the vicinity of the base of the blade 11, so that the air flow is sucked in from the direction along the rotation axis, It can be smoothly discharged in the radial (centrifugal) direction of the fan, and bending loss can be reduced.

Around the tip of the wing 11 in the axial direction, the bell mouth 18ab faces the rear recess 15 of the wing 11.
Since the front end of the front casing 1 is positioned, the upper end of the rear recess 15 also has a suction action.
In the vicinity of the front plate 18aa of 8a, the phenomenon that a part of the discharge flow backflows to the suction port (short circuit) as in the conventional case disappears, and a small circulating vortex shown as a streamline g in FIG. Not only is the loss of pressure leakage in 18 reduced, but the area of this circulating vortex is also reduced, which increases the effective outflow width Bu of the blades 11 of the centrifugal fan 10. In this case, since the inner flange 18ad of the front plate 18aa of the front casing 18a is installed closer to the outer peripheral side of the centrifugal fan 10 than the rotating shroud 13, the rotating shroud 13 has a substantially U-shaped space to prevent backflow. The effect is improved.

Further, on the suction side, the bell mouth 1
Since the portion of the blade 11 opened to the inner peripheral side from the diameter Dm of 8 ab has a tapered tapered portion 16 on the air intake side, the inflow is gradually started, which is the same as in the conventional case. Without the turbulence due to sudden wind cut,
Air will flow in smoothly. Moreover, the inflow velocity into the blade 11 is also smaller by making the bell mouth Dm larger than the inner diameter D _{1 of the} blade 11, so that the wind speed is small and the inlet loss is small. Therefore, a high air pressure is obtained and a large amount of air is obtained.

As described above, in this embodiment, it is possible to contribute to the improvement of the cooling power, and it is possible to contribute to the power saving. In addition, the air flow is smooth, resulting in low noise.

Regarding the strength, the core plate 1 of the centrifugal fan 10 is also used.
2 and the recessed portion on the back plate 18bb of the casing 18,
The ring-shaped rib 18bd supporting the vibration-proof rubber 20a, and the formation of the substantially U-shaped space by the inner flange 18ad and the bell mouth 18ab enhance the strength of the casing 18, and
Even if the casing 18 is strongly pressed by the air passage partition plate 23 to prevent air leakage, deformation can be reduced.

Further, as described with reference to FIG. 5, by increasing the circumferential width t ₂ of the blade 11 on the outflow side, the connection area with the rotating shroud 13 is increased as shown in FIG. The fan strength of the impeller as a whole can be increased, and conversely, the improvement in the strength can be used to reduce the wall thickness of the blade 11, which can be utilized for resource saving.

Furthermore, the back plate 18 of the casing 18
Since bb also serves as the closing plate of the storage chamber of the fan motor 19 together with the rear support 21, the heat generated from the fan motor 19 is less likely to enter the refrigerator and the safety can be improved. .

Furthermore, since one end of the fan motor 19 is supported in the front recess of the back plate 18bb, the rotation shaft 19a of the fan motor 19 can be shortened.
In addition to this, since the center of gravity of the centrifugal fan 10 approaches the fan motor side, vibration can be reduced and the fan motor 1
The fan device including zero can be thinned.

Furthermore, the back plate 18 of the casing 18
Installation of the fan motor 19 by bb and the rear support 21 attached to the back plate 18bb improves the alignment accuracy of the centrifugal fan 10 and the casing 18.

FIG. 7 is an enlarged sectional view showing the periphery of the boss portion of another specific example of the centrifugal fan 10 in FIG.
Is a plane end for stopper, and the same reference numerals are given to the portions corresponding to FIG.

In the figure, at the end of the boss 12a,
Flat end 12 for stopper that determines the insertion allowance of the rotating shaft 19a
c is provided. The stopper plane end 12c sets the positional relationship between the boss portion 12a and the rotary shaft 19a. Therefore, unlike the specific example shown in FIG. 2, it is not necessary to provide the shaft hole 14 with the small diameter portion 14b and the rotary shaft 19a with the small diameter portion 19c, and the machining work for them is unnecessary. Become. Further, a peephole having a diameter ds larger than the width S of the crack groove 12b is provided at the center of the stopper flat end 12c, and it is possible to confirm that the rotary shaft 19a reaches the stopper flat end 12c from this peep hole. To facilitate visual work. The configuration other than this is the same as the specific example shown in FIG.

FIG. 8 is a sectional view showing another specific example of the front casing 18a of FIG. 1 together with the axial tip portion of the blade 11, and the same reference numerals are given to the portions corresponding to FIG.

In the figure, the difference from the embodiment of FIG. 3 is that the bell mouth 18ab has a semicircular cross section, and surrounds the rotary shroud 13 from near the rear recess 15 of the blade 11 of the centrifugal fan 10. I am doing it. As a result, the same effect as that of the specific example shown in FIG. 3 can be obtained, and in addition to the bell mouth 32, the thickness (depth dimension) of the casing 18 is thin and the rounded portion is large, so that the surroundings of the rotary shroud 13 can be reduced. The vortex circulation action in the substantially U-shaped space becomes smooth, and pressure leakage can be efficiently prevented.

[0070]

As described above, according to the present invention,
The centrifugal fan can be easily attached to the fan motor shaft, the fan device can be made thinner, and the effective internal volume for storing food can be increased accordingly, and the fan device can be easily assembled and assembled. In addition, high air pressure, high air volume, low noise and low vibration can be achieved, and a fan device with high strength can be obtained.

[Brief description of drawings]

FIG. 1 is a cold air circulation fan device for a refrigerator / freezer according to the present invention.
FIG. 3 is a longitudinal sectional view of an essential part of an embodiment of a freezer-refrigerator incorporating the above.

FIG. 2 is an enlarged cross-sectional view showing the periphery of a boss portion of one specific example of the centrifugal fan in FIG.

FIG. 3 is a partially enlarged cross-sectional view showing an outer peripheral portion of the centrifugal fan in FIG. 1 and a portion of a front plate of the casing facing the outer peripheral portion.

FIG. 4 is a partially enlarged cross-sectional view showing a positional relationship between the blade of the centrifugal fan of FIG. 1 and a bell mouth of a casing.

FIG. 5 is a partial perspective view showing the blades and the rotary shackle of the centrifugal fan in FIG.

FIG. 6 is a cross-sectional view taken along the section line AA in FIG.

FIG. 7 is an enlarged cross-sectional view showing the periphery of a boss portion of another specific example of the centrifugal fan in FIG.

8 is a cross-sectional view showing another specific example of the front casing of FIG. 1 together with an axial tip portion of a blade.

[Explanation of symbols]

2 Freezer 3 refrigerating room 4 partition insulation wall 5 Ceiling insulation wall 6 Rear insulation wall 7 Side wall 8 cooler 10 Centrifugal fan 11 wings 12 heart plates 12a Boss 12b crack groove 13 rotating shroud 14 shaft hole 14a entrance 14b Small diameter part 15 Rear dent 16 point details 17 Guard 18 casing 18a front casing 18aa front plate 18ab bell mouth 18ac spiral part 18ad inner flange 18b Rear casing 18bb back plate 18bc spiral part 18bd ring rib 18 be pin 19 fan motor 19a rotating shaft 19b bracket 19c Small diameter part 20a, 20b Anti-vibration rubber 21 Rear support 21a Ring-shaped rib 22 Mounting member 23 Airway divider 24,25 Cold air return passage 26 coil spring 27 Discharge duct 28 Refrigerator connection duct

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masuji Sudo, Inventor Masuji Sudo 800, Odaira-cho, Shimotsuga-gun, Tochigi Prefecture, Hitachi Ltd. Living Equipment Division (72) Inventor Yasuo Kurihara, 709 Tomita, Ohira-cho, Shimotsuga-gun, Tochigi Prefecture No. 2 Inside Hitachi Tochigi Electronics Co., Ltd. (56) References Actually open 51-39808 (JP, U) Actually open 61-105794 (JP, U) Actually open Sho 52-13505 (JP, U) Actually open Flat 5-4862 (JP, U) Actually open 62-158198 (JP, U) Actually open 4-54998 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F04D 29 / 28 F04D 29/30 F04D 29/44 F25D 17/06

Claims (8)

(57) [Claims] 1. A freezer / refrigerator main body so as to project to the front side.
A core plate having a dented portion with a smooth surface, and the core plate
A plurality of blades provided on the outer peripheral side of the front surface and a recessed portion of the core plate
And a boss that has a hole for the rotating shaft formed on it.
A core fan, a casing accommodating the centrifugal fan, and a fan motor directly connected to the centrifugal fan by a rotation shaft.
And one end of the fan motor, the back of the refrigerator body
Rear support housed in a recess formed in the heat insulating wall
With the door, the casing, the shape of the recessed portion of the core plate on its rear side
Of the core plate so as to project to the front side
It has a dent part that partially goes into the dent part, and the fan motor turns at the innermost part of the dent part of the casing.
An opening for passing the rolling shaft is provided and one of the fan motor
An anti-vibration rubber member for supporting the end is provided, and the fan mower is provided by the back side of the casing and the rear support.
Freezing and cooling characterized by forming a space for storing data
Warehouse . 2. The refrigerating refrigerator according to claim 1, wherein the blade has a rear indented portion in the middle of the tip end surface in the axial direction . 3. An apparatus according to claim 1 or 2, the inner circumference side tip of the blade is tapered facing to the suction side this
Refrigerator and refrigerator characterized by . 4. The front plate of the casing according to claim 2 or 3 , facing the centrifugal fan.
A front plate of the casing is provided with an opening that forms a cool air suction port and faces the rear recessed portion.
Air protruding toward the wing side from the edge of the opening provided in the
Cooling characterized by a bell mouth for suction
Freezer refrigerator . 5. The bell mouth according to claim 4, wherein the cross-section of the bell mouth parallel to the central axis of the opening provided in the front plate of the casing has an arc shape.
The freezer-refrigerator, wherein the opening provided in the front plate of the casing has a diameter that gradually decreases from the root to the tip of the bell mouth on the front plate of the casing. 6. The rotating shroud according to claim 4 or 5 , wherein the outer peripheral tip end of each of the blades has a single ring shape.
And a front plate of the casing, which is integrated by a wood
On the wing side surface of the rotating shroud with the bell mouth.
The ring-shaped inner flange is integrated so that the
Refrigerator and refrigerator characterized by . 7. A cool air suction is provided on the inner side of the fixed wall of the freezer-refrigerator body.
Casing with a built-in opening and containing a centrifugal fan
And fixed to the casing, and the spine of the body of the refrigerator / freezer.
It is stored in the recess formed in the surface insulation wall and
And a rear support on which a fan motor is installed , and the casing has an opening around which a bell mouth is formed.
And a side plate whose cross-sectional shape forms a part of the spiral.
The front casing that is integrated, the back plate and the cross-sectional shape are spiral
After the side plate that forms a part of the
The side plate of the rear casing is the side plate of the front casing.
While being in contact with the inner surface of the front casing, the front casing was fitted with a plurality of blades integrally provided on the outer peripheral side of the centrifugal fan.
At the center of the back of the core plate, smooth so that it protrudes to the front side.
A dent is formed on the surface, and the tip of the dent has no step
A core plate of the centrifugal fan is provided on the outer surface of the rear plate of the rear casing , which is continuous with the shaft hole provided in the boss portion.
There is a protrusion on the inner surface of the back plate that is roughly aligned with the dent.
The dent portion is provided so as to be twisted, and the dent portion of the rear plate is provided.
Due to the dent of the core plate of the centrifugal fan
The fan motor , and the fan motor moves forward to the rear plate of the rear casing.
It is supported at the innermost part of the recessed part through a rubber cushion and
Being supported via anti-vibration rubber on the inner surface of the rear support
Characterized freezer-refrigerator . 8. The rear recess according to claim 7 , wherein a rear recess is provided in the middle of the axial tip surface of the blade.
Both of them have a tapered shape toward the suction side at the tip of the inner peripheral side of the blade.
A bell-shaped portion is provided, and the tip of the bell mouth is indented to the rear.
A refrigerator-freezer characterized by facing each other .