JP5294574B2 - Cooling storage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress cost increase and prevent damage of heater mounted to an air duct. <P>SOLUTION: By stretching the air duct 50 also serving as a drain pan on a ceiling part of a storage chamber 15, a cooler chamber 34 storing a cooler 29 is formed. A heat transfer plate 70 is stretched on the upper face of the air duct 50, and a freeze proofing heater 82 comprising a cord heater is wired in a region corresponding to a lower side on the front face side of the cooler 29 in the heat transfer plate 70. In the rear position of the wiring region of the heater 82, a plurality of ribs 90 higher than the heater 82 are integrally protruded leaving gaps in the width direction. When a portion in the vicinity of the wiring region of the heater 82 of the air duct 50 is lifted up, the ribs 90 contact a lower face of the cooler 29 first, so as to avoid interference of the heater 82 with the lower face of the cooler 29. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a cooling storage.

For example, a commercial refrigerator has a function of performing a defrosting operation in order to remove frost adhering to a cooler. Therefore, a refrigerator having the following structure is known. In this case, an air duct that also serves as a drain pan and is equipped with a cooling fan is stretched in an oblique position on the ceiling of the storage body, thereby forming a cooler chamber in which the cooler is accommodated. The drainage channel protruding from the lower position has a structure that enters a drainage passage provided on the wall surface of the storage body (see, for example, Patent Document 1).
The defrosting operation is performed by heating the cooler with a defrost heater equipped in the cooler, and the defrost water from the cooler or the like flows down after being received by the air duct and drains from the drainage channel. It is discharged out of the warehouse through the service passage. Further, a cord heater for preventing freezing is separately wired in a region below the cooler in the air duct so that the frost mass falling from the cooler does not freeze on the air duct.
JP-A-10-122725

Conventionally, as described above, since the cord heater for preventing freezing is wired at a position corresponding to the lower part of the cooler in the air duct, for example, when hitting the air duct when putting food in and out of the warehouse, While the air duct was deformed, the cord heater contacted the cooler, and there was a risk of damage such as disconnection. However, it is conceivable to install a protective member on the outer bottom surface of the cooler and take measures to prevent the cord heater from coming into contact with the cooler. There is.
The present invention has been completed based on the above circumstances, and an object thereof is to prevent damage to a heater mounted on an air duct while suppressing an increase in cost.

In the present invention, the ceiling portion of the storage body is formed with a cooler chamber in which a cooler is accommodated by an air duct that also serves as a drain pan is stretched in an oblique posture with a downward slope toward one side, In a cooling storehouse in which a drainage channel formed at a lower position of the air duct has entered a drainage passage provided on a wall surface of the storage body, a cooling fan is mounted in advance on a region on the upper side of the air duct. Can be suspended from below via a latching part, and the cooler is positioned in an inclined position following the air duct above the area on the lower side of the air duct and is pulled by the cooling fan. Cold air is generated while the stored air passes through the cooler, and the cold air is blown out from a blowout port provided on the lower end side of the air duct. A heater is disposed in an area of the duct facing the outer bottom surface on the upper side of the cooler, and a plurality of protrusions taller than the heater are wide on the lower side of the heater disposed area. direction are provided spaced, while the the lower surface of the cooler is wearing defrosting heater GaSo, the lower edge of the end plate of the cooler, protrudes from the end plate in the defrosting heater Ruhi over data mounting plate receives a portion is, the provided so as to project laterally at the lower position than the lower surface of the cooler, a position where a part of the protrusion opposed to the heater mounting plate It is characterized by the arrangement.

  According to the above configuration, when the vicinity of the heater installation area in the air duct is lifted, the heater may interfere with the lower surface of the cooler because the protrusion formed on the air duct first hits the lower surface of the cooler. Avoided. Since the protrusion is provided on the air duct itself, it can be manufactured at a lower cost than the case where it is provided as a separate part.

Also, pre-cooling fan is mounted on the d adduct, and because they become mountable hung over the hook member, the easier it der attachment and detachment of the air duct, which is convenient, such as when maintenance. However, when the air duct is attached, there is a risk that the vicinity of the heater installation area may come into contact with the lower surface of the cooler. Similarly, the interference of the heater itself can be avoided by hitting the protrusion first.
Furthermore, it can be said that frost is most likely to form on the upper side of the cooler, that is, the inlet side, and the frost mass is likely to fall from the same position. To be melted. Since the protrusions are on the lower side of the heater installation area, the heater can be protected, and a plurality of the protrusions are provided at intervals, so that the melted defrost water flows smoothly.

The air duct is made of synthetic resin, and a metal heat transfer plate is attached to a lower region of the cooler in the air duct, the heater is disposed on the heat transfer plate, and the protrusion is Is formed. Since the air duct is made of synthetic resin, it is lightweight and easy to handle, while the heater is disposed on the heat transfer plate, thereby ensuring a wide range of high temperature regions. Moreover, since the protrusion which protects a heater was provided in the heat exchanger plate, the increase in cost can also be suppressed.

  According to the present invention, it is possible to prevent damage to the heater attached to the air duct while suppressing an increase in cost.

<Embodiment>
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In this embodiment, a four-door refrigerator is illustrated.
1 and 2, reference numeral 10 denotes a refrigerator body, which is composed of a slightly vertically long heat insulating box with a front opening filled with a heat insulating material 13 made of foamed resin or the like between an inner box 11 and an outer box 12. It is supported by four legs 14 and the inside is a storage chamber 15. In the storage chamber 15, a shelf network 17 can be installed in multiple stages via shelf columns 16, and a heat insulating partition frame 18 formed in a cross shape is formed in the front opening of the storage chamber 15. A total of four doorways 19 are formed, and a double-spread type heat insulating door 20 is mounted in two upper and lower stages.

A machine room 22 is formed on the upper surface of the main body 10 by being surrounded by a panel, and the machine room 22 is equipped with a refrigeration unit 23.
In the refrigeration unit 23, a refrigeration device 25 including a compressor 26, an air-cooled condenser 27, and the like is placed on the upper surface of a heat-insulating base 24 having a flat square shape, and a cooler 29 is suspended on the lower surface side. The refrigeration apparatus 25 and the cooler 29 are connected by circulation through a refrigerant pipe 30 (FIG. 3). The cooler 29 is attached in an oblique posture with the back side (right side in FIG. 2) slightly lowered.
On the other hand, a window hole 32 that is slightly smaller than the base 24 is formed on the bottom surface of the machine room 22, in other words, on the back side of the ceiling wall 15 </ b> A of the storage room 15, and the base of the refrigeration unit 23 described above. 24 is attached by closing the window hole 32 while passing the cooler 29 through the lower surface side of the window hole 32.

On the lower surface side of the window hole 32 in the ceiling portion of the storage chamber 15, as will be described in detail later, an air duct 50 is stretched, and a cooler chamber 34 is formed above the air duct 50. The bottom surface 50A of the air duct 50 is formed to have a downward slope (substantially the same as the inclination angle of the cooler 29) toward the inner edge (right side in FIG. 2), and a suction port 35 is opened in the front side region. A cooling fan 36 is provided, and an air outlet 37 is formed between the rear edge and the back wall 15 </ b> B of the storage chamber 15.
When the cooling fan 36 is driven while operating the refrigeration apparatus 25 (compressor 26), the air in the storage chamber 15 is sucked into the cooler chamber 34 from the suction port 35 by the cooling fan 36, and the air is cooled. While flowing through the vessel 29, cold air is generated by heat exchange, the cold air is blown out from the blowout outlet 37 along the inner surface of the storage chamber 15, and the cold air is circulated and supplied into the storage chamber 15. Further, the internal temperature is detected by the internal thermistor 38 (FIG. 3), and the operation and stop of the refrigeration apparatus 25 are controlled according to the internal temperature, so that the internal temperature is maintained at a substantially constant cooling temperature. It is like that.

  Moreover, in order to remove the frost adhering to the cooler 29 etc., a defrost operation is performed suitably. For this reason, the cooler 29 is equipped with a defrosting heater 40 composed of a sheathed heater. As shown in FIG. 3, the defrost heater 40 is wired in a zigzag manner on the lower surface of the cooler 29 and is held by a heater mounting plate 41 mounted outside the lower edges of the left and right end plates 29 </ b> A in the cooler 29. Has been. As shown in part in FIG. 11, the heater mounting plate 41 has short side plates 43 </ b> A bent downward on both side edges of an elongated substrate 42 having a length almost equal to the depth of the cooler 29. 43B is formed.

The heater mounting plate 41 is hooked on a hook plate 29B that is formed so as to protrude from the inner edge of the end plate 29A to the side edge of the end plate 29A. By fixing the mounting plate 45 to the mounting plate 29C that is formed to project from the front edge of the end plate 29A with screws 46, as described above, it projects from the lower edge of the end plate 29A to the side. The defrosting heater 40 is configured to receive and support a portion protruding from the end plate 29 </ b> A and a connecting portion 48 with the lead wire 47. Here, the lower edges of the side plates 43 </ b> A and 43 </ b> B of the heater mounting plate 41 constitute the lowest position in the cooler 29.
On the other hand, the air duct 50 described above also serves as a drain pan that receives defrost water. The defrosting operation is performed by energizing the defrosting heater 40 to heat the cooler 29, and after the defrosting water is received by the air duct 50 (drain pan), it is provided in the back wall 15B of the storage chamber 15. The water is drained to the outside through the drainage passage 49.

Then, the structure of the drainage part of defrost water is demonstrated in detail.
The air duct 50 is made of a synthetic resin such as ABS resin, and is formed in a substantially planar dish shape as shown in FIGS. 4 and 5, except that the left and right side walls 51 are on the front side (the left side in FIG. 5). ) From the rear side to the back side, and as will be described later, the upper edge of the side wall 51 is attached in a horizontal posture, and in this attached state, the bottom surface 50A of the air duct 50 is It is designed to take an inclined posture with a downward slope toward the edge.

On the bottom surface 50 </ b> A of the air duct 50, a pair of left and right mounting plates 52 are formed so as to rise from a position within a predetermined dimension from the left and right side walls 51. Both the mounting plates 52 are formed so as to gradually become taller from the near side to the far side, like the left and right side walls 51, and as a whole, are slightly taller than the side walls 51. On the upper edge of each mounting plate 52, hooking portions 53 having a hook shape facing rearward are formed at two positions in the front and rear. On the other hand, the left and right peripheral surfaces of the window hole 32 formed in the ceiling wall 15A of the storage chamber 15 are formed with protrusions 32A on which the front and rear hook portions 53 of the air duct 50 are hooked.
Mounting seats 55 are formed on the front edge portion of the air duct 50 at three locations, the left and right ends and the center portion, and the mounting seat 55 is flush with the upper edge of the front wall 56 of the air duct 50. The screw insertion hole 57 is opened. On the other hand, a screw hole (not shown) into which the same screw is screwed is formed on the front edge of the lower surface side of the window hole 32.

In the area on the near side of the bottom surface 50A of the air duct 50, three suction ports 35 described above are formed side by side at intervals. Around the suction port 35, mounting seats 59 are provided so as to be positioned at the four corners, and the cooling fan 36 has four corners of the casing fitted into the mounting seats 59, as shown in FIG. Is fixed by being stopped with a screw 60. As shown in the figure, the lead wires 36A drawn out from the cooling fans 36 are extended to the right through the front side of the cooling fans 36, held by the purse lock 62, and then toward the machine room 22 side. Has been derived.
Further, seven rivet holes 63 are opened in the peripheral portion of the suction port 35 in the figure.

  In other words, the air duct 50 has the deepest portion on the back edge side, and as shown in FIG. 4, a drainage channel 65 is formed at a position slightly closer to the left side as viewed from the front than the center in the width direction of the back wall 64. Has been. As shown in FIG. 5, the drainage channel 65 is formed in a groove shape with a U-shaped cross section whose bottom side is an arc shape, and the bottom wall thereof is continuous with the bottom surface 50 </ b> A of the air duct 50 and descends toward the back side. The attitude that became.

  A heat transfer plate 70 is stretched on the bottom surface 50 </ b> A of the air duct 50. The heat transfer plate 70 is made of an aluminum plate, and as a whole, as shown in FIGS. 6 and 8, between the left and right mounting plates 52 on the bottom surface 50A of the air duct 50 and slightly behind the front wall 56. It is formed in a substantially rectangular shape that fits in a region from the entered position to a close position with a predetermined interval from the back wall 64. However, on the front side of the heat transfer plate 70, a cutout portion 71 for allowing the cooling fan 36 to escape is formed. In other words, four projecting plates 72 projecting forward are formed at intervals in the width direction. The front side is fastened at a predetermined position by fastening the front side with seven rivets 63A (see FIG. 10).

  Since the heat transfer plate 70 is stretched following the inclination of the air duct 50, the back edge side is inevitably the deepest part, and a back wall 73 is formed at the back edge, whereas as shown in FIG. A drainage port 74 is formed at a position on the wall 73 slightly to the left from the center in the width direction, that is, at a position corresponding to the drainage channel 65 of the air duct 50. Specifically, the back wall 73 is formed with a substantially same height dimension as the back wall 64 of the air duct 50 by raising the back edge of the heat transfer plate 70 at a right angle, and in the middle of the back wall 73. In the predetermined position, the drainage port 74 is formed by cutting the lower height region having the same width as the drainage channel 65.

From the upper edge of the drain port 74, an elongated cover 75, which is also made of an aluminum plate and has a U-shaped cross section, protrudes toward the back side, and the heat transfer plate 70 is located at a predetermined position on the bottom surface 50A of the air duct 50. Along with the tension, the cover 75 fits slightly above the central height position of the drainage channel 65 so as to close the upper surface opening of the drainage channel 65. As shown in FIG. 5, the tip of the cover 75 remains at a position that is less than the tip of the drainage channel 65.
Further, the back wall 73 of the heat transfer plate 70 is arranged at a predetermined interval on the front side of the back wall 64 of the air duct 50, so that a mounting space 76 is formed over the entire width therebetween, and the back wall 73. A flange 73A is formed at the upper edge by bending at right angles to the back side, and this flange 73A covers the upper surface of the mounting space 76 described above.

A first antifreeze heater 81 made of a cord heater is wired from the inner wall 73 of the heat transfer plate 70 to the cover 75. The code heater has a shape in which the heater wire is covered with silicon rubber. As shown in FIG. 7, one end of the first antifreeze heater 81 is disposed on the right end (lower side) of the outer surface of the inner wall 73 as viewed from the front, and extends along the outer surface of the inner wall 73. Then, the wiring is routed toward the drain port 74, followed by wiring along the right side edge on the upper surface of the cover 75 toward the front end side, U-turns when protruding from the front end of the cover 75, and along the opposite left side edge. Wiring is performed toward the base end side, and is further performed to the left end along the outer surface of the back wall 73. The lead 81 </ b> A drawn from the other end of the heater 81 is U-turned upward at the left end, and is then routed along the back wall 73 to the right end.
In such a wired state, it is attached to the outer surface of the back wall 73 and the upper surface of the cover 75 by an aluminum foil having an adhesive surface. Both lead wires 81 </ b> A are aligned and drawn forward along the right edge of the heat transfer plate 70.

  Further, in the region corresponding to the lower part of the front end portion of the cooler 29 in the heat transfer plate 70, in other words, the region immediately after the position where the cooling fan 36 is disposed, the second freeze waterproof heater 82, which is also made of a code heater, is wired. Has been. Specifically, an aluminum foil 85 on which the second freeze waterproof heater 82 is held is provided, and this aluminum foil 85 is comparable to almost the entire width of the heat transfer plate 70 as shown in FIGS. It has a shape in which four projecting portions 87 projecting on the projecting plates 72 of the heat transfer plate 70 from the front edge of the elongated main body portion 86 having a length are formed. The vertical width of the main body portion 86 is about half of the diameter of the suction port 35, and the protruding portion 87 is narrower than the protruding plate 72 and protrudes to a substantially half region on the proximal end side of the protruding plate 72. It is like that. Note that adhesive surfaces are formed on both front and back surfaces of the aluminum foil 85.

  The second freeze waterproof heater 82 is wired in a predetermined form on the surface of the aluminum foil 85 described above. As shown in FIG. 6, one end of the heater 82 is disposed at the left side position of the protruding portion 87 at the right end (bottom of the drawing) viewed from the front, and the first line 82 </ b> A is the front edge of the main body 86. Is routed to the left end along the line. However, in the same first line 82A, in the middle position corresponding to the remaining three protruding portions 87, the protruding portions 87 are wired in a protruding manner in a hairpin shape (hairpin-shaped portion 82E). The heater 82 returned from the leftmost protrusion 87 to the left end of the main body 86 has a second stripe 82B, which is parallel to the first stripe 82A at a rear position spaced apart from the first stripe 82A. It is wired to the left edge position of the right protruding portion 87, and then is bent into a hairpin shape, and the third stripe 82C is parallel to the second stripe 82B at the rear position spaced apart from the second stripe 82B. Wiring is performed up to the right edge position of the left protrusion 87. Further, it is turned into a hairpin shape, and at the rear position at the same interval from the third line 82C as the fourth line 82D, it extends along the rear edge of the main body portion 86 in parallel with the third line 82C, and the rightmost Wiring is performed up to the left edge position of the protrusion 87. Finally, the other end of the heater 82 forms an arc shape and is disposed on the right side of the rightmost protrusion 87. A lead wire 84 is connected to both ends of the heater 82 via a connecting portion 83 so as to be drawn forward.

As described above, the second antifreeze heater 82 has a four zigzag shape in the front-rear direction on the main body portion 86 of the aluminum foil 85, and the protruding portion 87 is wired to protrude from the first item 82A into a hairpin shape. As a result, the second antifreeze heater 82 is wired over almost the entire area of the aluminum foil 85. However, the non-wiring region 88 of the heater 82 is secured in the left corner on the rear side of the aluminum foil 85 by retreating the connecting portion between the third stripe 82C and the fourth stripe 82D of the heater 82 inside, Further, at the right corner, the other end of the heater 82 is wired in an arc shape, so that a non-wiring region 88 of the heater 82 is also secured.
In this way, the aluminum foil 85 on which the second freeze waterproof heater 82 is held is connected to a predetermined position on the heat transfer plate 70, specifically, as shown in FIG. And the protruding portion 87 is pasted at a position where the protruding portion 87 protrudes to the proximal end side of the protruding plate 72.

  In the heat transfer plate 70, a rib 90, which is a protrusion of the present invention, is formed at a position immediately behind the rear edge of the aluminum foil 85 attached as described above. The rib 90 has a horizontally long plane shape, and is formed by being knocked out from the lower surface side at three convenient locations of the center portion and both end portions in the width direction of the heat transfer plate 70. More specifically, the rib 90 has a mountain-shaped cross section as shown in FIG. 10, and both end portions in the length direction are formed in an inclined shape with rounded corners, and the height of the rib 90 is particularly high. However, it is nearly twice the height of the second freezing and waterproof heater 82 wired on the heat transfer plate 70 as described above.

  As described above, the drainage passage 49 is provided in the back wall 15B of the storage chamber 15, but at the upper position thereof, as shown in FIG. One end of 95 is connected, the flange 96 is fixed to the inner box 11, and the other end is open to the inner surface of the back wall 15B. Therefore, the front end side of the drainage channel 65 protruding from the air duct 50 can be advanced so as to face the drainage passage 49 through the connection pipe 95. A drain hose (not shown) is connected to the lower end portion of the drainage passage 49 and led to a drainage location such as a drainage groove.

Then, the effect | action of this embodiment is demonstrated.
The air duct 50 is assembled and attached as follows. As shown in FIG. 7, the first freeze waterproof heater 81 is wired from the back wall 73 of the heat transfer plate 70 to the cover 75. At the same time, the second antifreeze heater 82 is wired in a predetermined form through the aluminum foil 85 in the region along the front edge of the heat transfer plate 70 as described in detail above.
As shown in FIG. 8, the heat transfer plate 70 to which the first and second antifreeze heaters 81 and 82 are mounted as described above fits the air inlets 35 into the front cutouts 71 and allows them to escape, as shown in FIG. 50 is placed on almost the entire surface except the front side of the bottom surface 50 </ b> A, and rivets 63 </ b> A are driven into and fixed at seven locations around the suction port 35 on the front side of the heat transfer plate 70. With the attachment of the heat transfer plate 70, as shown in FIG. 5, the cover 75 protruding from the drainage port 74 is fitted at a position slightly above the central height position of the drainage channel 65. A packing 98 is fitted around the base end side of the drainage channel 65.

The lead wire 81A of the first antifreeze heater 81 is routed forward through the space between the right side wall 51 of the air duct 50 and the right mounting plate 52, and is held by the purse lock 62 in the middle. Further, the lead wire 84 of the second antifreeze heater 82 is also held by the purse lock 62 halfway as shown in FIG.
Next, as shown in the figure, the cooling fans 36 are respectively placed in the three suction ports 35, and are fixed with screws 60 at two diagonal positions. After the lead wires 36 </ b> A of the cooling fans 36 are gathered together, the lead wires 36 </ b> A are held by the same lock 62 and led out.

When the heat transfer plate 70 wired with the first and second antifreeze heaters 81 and 82 and the cooling fan 36 are attached to the air duct 50 as described above, the air duct 50 is stored as shown in FIG. It is attached to the lower surface side of the window hole 32 in the ceiling wall 15 </ b> A of the chamber 15.
For this purpose, as shown in FIG. 5, the left and right mounting plates 52 are inserted into the connecting pipe 95 of the rear wall 15 </ b> B while the drainage channel 65 protruding from the rear edge of the air duct 50 is inserted into the left and right of the window hole 32. It is inserted along the peripheral surface from below, and the front and rear hooking portions 53 of each mounting plate 52 are hooked and temporarily held by the front and rear projections 32A of the corresponding window holes 32, respectively. At the same time, the lead wires 81A and 84 of the antifreeze heaters 81 and 82 drawn from the air duct 50 and the lead wire 36A of the cooling fan 36 are inserted through holes (see FIG. (Not shown) through the machine room 22.
Finally, screws are passed through the insertion holes 57 of the three mounting seats 55 provided on the front edge side of the air duct 50, and screwed into the screw holes of the ceiling wall 15A to be tightened, whereby the air duct 50 is fixed. Installation is complete.

When the air duct 50 is attached, as shown in FIG. 3, the drainage channel 65 passes through the connection pipe 95 opened in the back wall 15 </ b> B of the storage chamber 15 and faces the upper position of the drainage passage 49.
Further, as shown in FIGS. 9 and 10, the second antifreeze heater 82 wired to the heat transfer plate 70 includes a first thread 82 </ b> A and a hairpin-like portion 82 </ b> E protruding from the front end surface in the cooler 29. The second line 82B to the fourth line 82D are located behind the front end surface of the cooler 29, that is, in a state where the second line 82B to the fourth line 82D are embedded in the lower surface side of the cooler 29.

Of the three ribs 90 projecting from the heat transfer plate 70, the ribs 90 at both the left and right end portions, as shown also in FIG. 11, each inner side plate 43A in the left and right heater mounting plates 41. In detail, it is located directly below a location that is within a predetermined dimension from the front end of the same side plate 43A. On the other hand, the central rib 90 corresponds to the central portion in the width direction on the lower surface of the cooler 29 and below the portion that enters the predetermined length from the front edge.
In addition, with respect to the outer side plates 43B of the left and right heater mounting plates 41, most of the portion protruding into the aluminum foil 85 on the front end side is above the non-wiring region 88 of the heater 82 on the aluminum foil 85. Correspond.

  As described above, the cooling operation is performed by circulating the cold air in the storage chamber 15, and during this time, the storage object is put in and out of the shelf network 17 of the storage chamber 15 while opening and closing the heat insulating door 20. Is done. Here, particularly when the storage object is put into and out of the uppermost shelf network 17, the storage object hits the lower surface of the air duct 50, and since the air duct 50 itself is made of synthetic resin, it is curved upward and is secondly frozen. There is a possibility that the region where the heater 82 is disposed is also lifted so as to approach the lower surface of the cooler 29. However, when the left and right end portions of the arrangement region are lifted, the left and right ribs 90 abut against the side plate 43A on the inner side of the heater mounting plate 41, so that the upward deformation is restricted, and the second antifreeze heater. Interference with the side plates 43A and 43B of the heater mounting plate 41 is avoided. Further, the central portion in the width direction of the region where the heater 82 is disposed originally has a large gap from the lower surface of the cooler 29. Therefore, the heater 82 is restricted from being further lifted by hitting the lower surface of the cooler 29, and similarly, the heater 82 is prevented from interfering with the lower surface of the cooler 29.

When the cooling operation is continued, frost is gradually formed on the cooler 29 and the like. In the refrigerator according to the present embodiment, since the cool air is generated by circulating the cooler 29 from the front side of the refrigerator air, it can be said that the refrigerator is particularly easily frosted on the front side of the cooler 29. Therefore, the defrosting operation is appropriately performed in the middle of the cooling operation. This defrosting operation is performed by energizing and heating the defrosting heater 40 provided in the cooler 29. Two anti-freezing heaters 81 and 82 are energized.
By the defrosting operation, the frost adhering to the cooler 29 and the like melts and becomes defrosted water, which is dripped onto the air duct 50, flows down to the back following the inclination of the bottom surface, passes through the drainage channel 65, and the back wall 15B After flowing down the drainage passage 49, the water is drained to a predetermined drainage point via a drain hose.

  During this time, frost may fall as a lump from the cooler 29 or the like, but a metal heat transfer plate 70 is attached to the lower surface side of the cooler 29 and heated by the second antifreeze heater 82. Therefore, the lump that has fallen is melted by the heat of the heat transfer plate 70 and becomes defrosted water and flows down toward the drain port 74. As described above, it can be said that the frost mass is likely to fall from the front surface side of the cooler 29, but the second antifreeze heater 82 is positively disposed below the front surface of the cooler 29 and has the highest temperature. Therefore, the mass of frost is also melted efficiently. In addition, since the rib 90 is formed at intervals, the rib 90 does not hinder defrosted water flowing from the front of the rib 90.

In addition, the frost mass may not be melted on the heat transfer plate 70 and may remain on the back wall 73 of the heat transfer plate 70 or may enter the drainage channel 65 and remain therein. Since the first antifreeze heater 81 is wired on the back side of the back wall 73 and the cover 75 attached to the drainage channel 65, the remaining frost mass is melted by the heat and becomes defrosted water. Will be discharged promptly.
When the predetermined defrosting operation is completed, the cooling operation is resumed.

In the case of maintenance, the air duct 50 may be removed together with the cooling fan 36, and at that time, it is reattached as described above. When it repeats simply, while inserting the drainage channel 65 of the rear edge of the air duct 50 into the connection pipe 95 of the back wall 15B, the left and right mounting plates 52 are inserted along the left and right peripheral surfaces of the window hole 32 from below, and each mounting plate After the latching portion 53 of 52 is latched and temporarily held by the projection 32A of the window hole 32, the mounting seat 55 on the front edge side of the air duct 50 is screwed.
During this time, in order to receive and support the air duct 50, a hand is often attached to the central portion of the lower surface of the air duct 50, that is, the central portion of the region where the second antifreeze heater 82 is disposed. When it is hooked and temporarily held on the portion 32A, there is a possibility that the center portion of the arrangement region will be pushed up greatly without any plan. However, in this case as well, it is avoided that the heater 82 interferes with the lower surface of the cooler 29 because the central rib 90 projecting from the heat transfer plate 70 first hits the lower surface of the cooler 29.

Even when hands are attached to the left and right ends of the air duct 50 and lifted, the left and right ribs 90 abut against the side plate 43A on the inner side of the heater mounting plate 41, and further lifting is restricted. It is avoided that the second antifreeze heater 82 interferes with the side plates 43A and 43B of the heater mounting plate 41.
Further, for example, when the position corresponding to the outer side plate 43B of the heater mounting plate 41 is strongly pushed up at both ends of the arrangement region of the second antifreeze heater 82, for example, the same position becomes the outer side plate 43B of the heater mounting plate 41. Although there is a possibility of being pushed, the same position is set as a non-wiring area 88 of the heater 82 where the second antifreeze heater 82 is not intentionally wired, so the heater 82 is placed on the side plate 43B outside the heater mounting plate 41. Interference can also be avoided.
This is also true for the case where it hits the lower surface of the air duct 50 when taking in or out the storage object.

  As described above, in the present embodiment, the second antifreeze heater 82 is disposed at a lower position on the front side of the cooler 29 in the air duct 50, but at a position immediately behind the disposed region. Ribs 90 having a height about twice that of the second freezing and waterproofing heater 82 are formed at three convenient places between the center and both ends in the width direction. Therefore, when the air duct 50 is mounted, the object to be stored hits the lower surface of the air duct 50 and pushes up the air duct 50, or when the air duct 50 is remounted at the time of maintenance or the like, , The rib 90 first hits the lower surface of the cooler 29 and the side plate 43A of the heater mounting plate 41 to restrict further push-up, and the second antifreeze heater 82 is connected to the lower surface of the cooler 29 and the heater. Interference with the side plates 43A and 43B of the mounting plate 41 can be avoided, and the heater 82 can be prevented from being damaged.

In addition, the air duct 50 is made of synthetic resin for weight reduction or the like, whereas a heat transfer plate 70 made of a metal plate is stretched on the air duct 50 in order to dispose the antifreeze heaters 81 and 82. Although the rib 90 that protects the second antifreeze heater 82 is integrally formed by striking the heat transfer plate 70, it is compared with the case where the heater protection member is provided as a separate part. It can be handled at low cost.
As a result, it is possible to prevent the second antifreeze heater 82 attached to the air duct 50 from being damaged while suppressing an increase in cost.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.
(1) The number of ribs for preventing the heater is not limited to the three illustrated in the above embodiment, and can be arbitrarily set according to conditions such as the size of the area where the antifreeze heater is disposed.
(2) In the above embodiment, the protrusion for preventing the heater is a rib by hammering out, but it may be a cut-and-raised protrusion.

(3) The freeze prevention heater is not limited to the cord heater exemplified in the above embodiment, but may be another type of heater such as a belt heater.

(4) Even if the air duct is of a type that is not attached / detached for maintenance or the like, the air duct may be pushed up by hitting a storage object, and therefore the present invention can be applied to such a thing.
(5) The present invention can also be applied to a type in which the air duct itself is made of a metal plate and does not include a heat transfer plate. In that case, a protrusion for protecting the heater is integrally formed on the air duct itself. do it.
(6) The present invention is not limited to refrigerators, but is widely used in a wide range of cooling storage cabinets in which anti-freezing heaters are provided in a predetermined region located below a cooler in an air duct that also serves as a drain pan, such as a freezer Can be applied.

The front view of the refrigerator which concerns on one Embodiment of this invention Same longitudinal section Expanded cross section near the cooler room Air duct top view Sectional view showing temporary holding structure of air duct Top view of heat transfer plate and aluminum foil Top view of the state where the anti-freeze heater is wired to the heat transfer plate Top view of the air duct with the heat transfer plate stretched Plan view when assembly of air duct is completed The expanded sectional view which shows the structure of the arrangement | positioning area | region vicinity of a 2nd antifreeze heater The perspective view which shows the one end side of the arrangement | positioning area | region of a 2nd antifreeze heater

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Refrigerator main body (storage main body) 15 ... Storage room 15B ... Back wall 29 ... Cooler 34 ... Cooler room 35 ... Suction port 36 ... Cooling fan 37 ... Outlet 40 ... Defrost heater 41 ... Heater mounting plate 49 ... Drain Passage 50 ... Air duct 53 ... Hanging portion 65 ... Drainage channel 70 ... Heat transfer plate 82 ... Second antifreeze heater (heater) 85 ... Aluminum foil 90 ... Rib (projection)

Claims (2)

On the ceiling of the storage body is formed a cooler chamber in which a cooler is housed by an air duct that also serves as a drain pan is stretched in an inclined posture with a downward slope toward one side, and a lower part of the air duct In the cooling storage where the drainage channel formed at the position entered the drainage passage provided on the wall surface of the storage body,
A cooling fan is mounted in advance on the area on the upper side of the air duct, and the air duct can be suspended from below via a latching portion, and the cooling air is located above the area on the lower side of the air duct. The cooler is positioned in an inclined posture following the air duct, and cool air is generated while the internal air drawn by the cooling fan passes through the cooler, and the cool air is provided on the lower end side of the air duct. It is designed to be blown out from the air outlet,
A heater is disposed in a region of the air duct that faces the outer bottom surface on the upper side of the cooler, and a plurality of protrusions that are taller than the heater are disposed on the lower side of the heater disposed region. It is provided at intervals in the width direction,
The one in which the lower surface of the cooler is wearing defrosting heater GaSo, the lower edge of the end plate of the cooler, the defrost receiving a portion protruding from the end plate in the heater Ruhi over data mounting plate , Is provided so as to protrude laterally at a position below the lower surface of the cooler,
A cooling storehouse, wherein some of the protrusions are arranged at positions facing the heater mounting plate. While the air duct is made of synthetic resin, a metal heat transfer plate is attached to a region below the cooler in the air duct, the heater is disposed on the heat transfer plate, and the protrusion is formed. The cooling storage according to claim 1, wherein

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