JP2013253763A - Cooling storage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently heat a receiving board of a heat transfer plate, while utilizing heat dissipated from a heater portion of an existing defrosting heater.SOLUTION: A defrosting heater 40 is attached to a lower surface of a cooling device 26. A heater portion 40A forming a part of the defrosting heater 40 is arranged across the rear edge side of the lower surface of the cooling device 26. A drain channel 54 connected to a drain portion 19 formed on the wall surface 12B of the storage body 10 is formed to project in the rear wall 51C of an air duct 50. A metal heat transfer plate 55 is laid on the air duct 50. A receiving board 56 is formed on the heat transfer plate 55, rising along the rear wall 51C of the air duct 50. The receiving board 56 has a drain port 56A communicating with the drain channel 54. In the heater portion 40A of the defrosting heater 40, an opened cover 60 is provided on the receiving board 56 side of the heat transfer plate 55.

Description

  The present invention relates to a cooling storehouse having a defrosting function using a defrosting heater.

Some commercial refrigerators and the like have a function of performing a defrosting operation to remove frost adhering to a cooler. For example, one described in Patent Document 1 is known. This has a cooler chamber in which the cooler is housed by the air duct made of synthetic resin that also serves as a drain pan is stretched in a slanting posture with a downward slope toward one side on the ceiling of the storage body. The defrost heater which consists of a sheathed heater is attached to the lower surface of the cooler. On the other hand, a drainage channel connected to the drainage part provided on the wall surface of the storage body is projected on the inner wall of the air duct, and a metal heat transfer plate is laid on the air duct. Has a structure in which a receiving plate rises along the inner wall of the air duct, and a drain outlet connected to the drainage channel is opened in the receiving plate. The reason why the heat transfer plate is laid is to prevent icing by heating the heat transfer plate by heat radiation of the defrost heater or the like.
During the defrosting operation, frost is removed by heating the cooler with the defrosting heater, and the defrosted water falls on the heat transfer plate. After being melted and flowing down on the heat transfer plate together with the above defrost water and received by the receiving plate of the heat transfer plate, from the opening of the receiving plate, through the drainage passage of the air duct, It is supposed to be drained.

JP 2009-14284 A

By the way, in the defrosting water draining step described above, there is a risk that ice blocks or the like that have not melted on the heat transfer plate stay on the front surface of the receiving plate and freeze to clog the drain outlet. Therefore, in the past, a heater part forming a part of the defrost heater was arranged so as to cross the inner edge side of the lower surface of the cooler, and means for heating the backing plate by heat radiation of the heater part was taken. The actual situation is that the temperature is not sufficiently raised in the vicinity of the lower corner of the front surface of the backing plate where ice blocks and the like tend to accumulate. In order to assist in raising the temperature, a separate heater is also provided on the back side of the backing plate. However, only a small capacity heater can be installed due to space limitations. The temperature has not been sufficiently increased to the vicinity of the corner.
The present invention has been completed based on the above circumstances, and its purpose is to effectively heat the receiving plate of the heat transfer plate while utilizing the heat radiation of the heater portion of the existing defrost heater. There is a place to do so.

  In the cooling storage according to the present invention, the cooling unit is housed in the ceiling portion of the storage body by an air duct made of a synthetic resin that also serves as a drain pan is stretched in a slanting posture with a downward slope toward one side. A cooler chamber is formed, and a defrost heater is attached to the lower surface of the cooler, and a heater part forming a part of the defrost heater is arranged so as to cross the inner edge side of the lower surface of the cooler. In addition, a drainage channel connected to a drainage part provided on the wall surface of the storage body is projected on the back wall of the air duct, and a metal heat transfer plate is laid on the air duct, and this heat transfer The plate is formed with a receiving plate rising along the inner wall of the air duct, and a drain port connected to the drainage channel is opened in the receiving plate. Heat transfer plate Wherein the receiving plate side has characterized in that the cover which is open is provided.

  When the cooler is heated by the defrost heater, frost formation is removed, and the defrost water falls onto the heat transfer plate laid on the air duct. At this time, the heat transfer plate also rises in temperature due to the heat release of the defrost heater. If it falls in the form of ice blocks, it melts and flows down on the heat transfer plate together with the above defrost water, and is received by the receiving plate of the heat transfer plate. The water is drained to the drainage part of the wall surface of the storage body through a drainage channel protruding from the back wall of the air duct. At this time, ice blocks or the like that have not melted may remain on the front surface of the receiving plate, but the heater portion of the defrosting heater closest to the receiving plate is covered with an open cover on the receiving plate side. Therefore, the heat generated in the heater is radiated toward the receiving plate after it is trapped in the cover. For this reason, the receiving plate is effectively heated to melt the ice block on the front surface thereof and prevent freezing.

The following configuration may also be used.
(1) The defrost heater is supported and supported by a pair of brackets mounted along left and right side edges on the lower surface of the cooler, and the cover is on the back side of the brackets. It is provided in the form passed between the edges.
When mounting the bracket, it is fixed to the cooler by screwing or the like in the form of being applied to the defrost heater, but if the cover is not passed between the brackets, each bracket is screwed individually. Since it must be stopped, especially when the first bracket is mounted, the defrost heater is likely to be displaced from the fixed position, and the correction or the like takes time and effort.
On the other hand, in the present invention, since the covers are passed to both brackets and integrated, both the brackets are applied to the defrost heater, and then the brackets are alternately screwed little by little. Both brackets can be fixed without incurring misalignment, and as a result, the support operation of the defrost heater can be performed quickly. Moreover, the reinforcement function of a bracket is fulfilled by having passed the cover.

(2) The cooler is provided with a pair of end plates with protruding rear edges on the left and right sides of the fin group in which a large number of fins are juxtaposed, and evaporates through the fin group and both end plates. It has a structure in which a pipe is meandered, and the heater portion of the defrost heater is mounted across the lower edges of the rear edge portions of the end plates, and the cover is In a form that can cover the upper surface side of the heater portion to a position close to the receiving plate, the heater portion is provided between the opposing surfaces of the rear edge portions of the both end plates.
During the cooling operation, the cover functions so that the cool air from the cooler is not directly applied to the front surface of the receiving plate including the drain port, and the drainage is difficult to freeze at the front surface of the receiving plate and the drain port.

(3) The said cover is provided in the form extended from the upper edge of the said receiving plate of the said heat exchanger plate to the near side through the upper part of the said heater part.
In addition to the heat radiation from the heater part, the radiant heat from the upper surface of the cover can be applied to the front surface of the receiving plate for efficient heating.

(4) The cover includes a mounting portion that covers the front side from the upper surface of the heater portion and is fitted to the heater portion, and an extending plate that extends from the mounting portion to a position near the receiving plate. ing.
When the attachment portion of the cover is fitted and fixed to the heater portion, the extension plate extending from the attachment portion is arranged close to the receiving plate of the heat transfer plate. The heat from the heater is prevented from escaping to the upper surface or the front surface by the cover, and is efficiently directed to the receiving plate. When the cover is provided, the attachment part is simply fitted into the heater part itself, so that the cover attachment structure is simplified.

(5) A recess is notched in the extending edge of the extending plate in the cover.
Even if the extension edge of the extension plate comes into contact with the heat transfer plate due to a change in the mounting posture of the cover, etc., the defrosted water is formed on the heat transfer plate by forming the recess. There is no hindrance to the flow.

  According to the cooling storage of this invention, the receiving plate of a heat-transfer plate can be heated effectively, utilizing the heat radiation of the heater part of the existing defrost heater.

Front view of the refrigerator according to Embodiment 1 of the present invention Same longitudinal section Air duct perspective view Expanded cross section near the cooler room Perspective view showing heater cover mounting structure Sectional view showing heater cover arrangement structure Perspective view seen from the back Perspective view seen from the bottom Sectional drawing which shows arrangement | positioning structure of the heater cover which concerns on Embodiment 2. Perspective view seen from the back The expanded sectional view near the cooler room concerning Embodiment 3. Sectional view showing heater cover arrangement structure Perspective view seen from the back of the air duct Perspective view seen from the front Sectional drawing which shows arrangement | positioning structure of the heater cover which concerns on Embodiment 4. Perspective view seen from the back Partially cutaway perspective view showing heater cover mounting structure

<Embodiment 1>
Embodiment 1 of the present invention will be described below with reference to FIGS. In this embodiment, a four-door refrigerator is illustrated.
In FIG.1 and FIG.2, the code | symbol 10 is a refrigerator main body, Comprising: It is comprised from the slightly vertically long heat insulation box body of the front opening, and while being supported by the four legs 11, the inside becomes the storage chamber 12. ing. In the storage chamber 12, a shelf network 14 can be installed in a plurality of stages via a shelf column 13, and a heat insulating partition assembled in a cross shape in the front opening 15 of the storage chamber 12. A total of four doorways 17 are formed by mounting the frame 16, and a double-spread type heat insulating door 18 is mounted in two upper and lower stages.

A machine room 20 is formed on the upper surface of the main body 10 by being surrounded by a panel, and the machine room 20 is equipped with a refrigeration unit 21.
In the refrigeration unit 21, a refrigeration device 23 including a compressor 24, an air-cooled condenser 25, and the like is placed on the upper surface of a heat-insulating base 22 having a flat square shape, and a cooler 26 is suspended on the lower surface side. The refrigeration apparatus 23 and the cooler 26 are connected by circulation through a refrigerant pipe (not shown).

As shown in FIGS. 7 and 8, the cooler 26 has end plates 28 arranged on both left and right sides of the fin group 27 in which a large number of fins 27 </ b> A are arranged in parallel, and is aligned with the fin group 27 and both end plates 28. The evaporation pipe 30 passes through the through-hole 29 formed in a meandering manner and is formed in a block shape as a whole. As shown in FIG. 4, the peripheral edges of the left and right end plates 28 protrude from the peripheral edge of the fin group 27 by a predetermined dimension. In particular, the rear edge portion 28A of the end plate 28 has a back wall 51C of the air duct 50 described later. It overhangs so as to approach. Further, as shown in FIG. 8, a protective plate 32 that is bent at right angles to the outside is formed on the front edge of the end plate 28. The cooler 26 is attached in an oblique posture with the back side (the right side in FIG. 2) slightly lowered.
On the other hand, a window hole 34 that is slightly smaller than the base 22 is formed on the bottom surface of the machine room 20, in other words, on the back side of the ceiling wall 12 </ b> A of the storage room 12, and the base of the refrigeration unit 21 described above. 22 is attached by closing the window hole 34 while passing the cooler 26 through the lower surface side of the window hole 34.

As will be described in detail later, an air duct 50 is stretched on the lower surface side of the window hole 34 in the ceiling portion of the storage chamber 12, and a cooler chamber 35 is formed above the air duct 50. The bottom surface 50A of the air duct 50 is stretched so as to have a downward slope (substantially the same as the inclination angle of the cooler 26) toward the inner edge (the right side in FIG. 2), and a suction port 36 is opened in the front side region. A cooling fan 37 is provided, and an air outlet 38 is formed between the rear edge and the back wall 12 </ b> B of the storage chamber 12.
When the cooling fan 37 is driven while operating the refrigeration apparatus 23 (compressor 24), the air in the storage chamber 12 is sucked into the cooler chamber 35 from the suction port 36 by the cooling fan 37, and the air is cooled. While flowing through the vessel 26, cold air is generated by heat exchange, the cold air is blown out from the outlet 38 along the inner surface of the storage chamber 12, and the cold air is circulated and supplied into the storage chamber 12. Further, the internal temperature is detected by the internal thermistor 39 (FIG. 4), and the operation and stop of the refrigeration apparatus 23 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 26 etc., a defrost operation is performed suitably. Therefore, a defrost heater 40 made of a sheathed heater is provided on the lower surface of the cooler 26.
More specifically, as shown in FIG. 4, eight mounting grooves 42 formed of U-shaped grooves are formed on the lower edges of the left and right end plates 28 at predetermined intervals in the front-rear direction. The frontmost and rearmost mounting grooves 42 are open on the front surface or the rear surface. Of the mounting grooves 42 described above, the defrosting heater 40 is fitted in a zigzag manner over the five mounting grooves 42 on the left and right front sides and the mounting grooves 42 on the rearmost ends on the left and right. As shown in FIG. 17, the defrost heater 40 is formed in advance in a predetermined routing shape. These defrost heaters 40 are supported by a pair of brackets 45 mounted along the left and right side edges on the lower surface of the cooler 26, as will be described later.
When the defrost heater 40 is supported in this manner, the defrost heater 40 is arranged in a zigzag shape immediately below the front most part of the lower surface of the fin group 27, and the straight line at the rearmost part of the defrost heater 40 is also provided. The heater portion 40 </ b> A is arranged so as to cross the lower edge portions of the lower edges of the left and right end plates 28.

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 and heating the cooler 26. The defrosting water is received in the air duct 50 (drain pan) and then provided in the back wall 12 </ b> B of the storage chamber 12. The water is drained to the outside through the drainage passage 19.
The structure of the drainage part of defrost water is demonstrated.
The air duct 50 is made of a synthetic resin such as ABS resin, and is formed in a substantially square dish shape as shown in FIGS. 3 and 4, except that the left and right side walls 51A are on the front side (the right side in FIG. 4). ) From the back edge to the back side, and the back end side protrudes rearward from the back edge of the bottom surface 50A.

Inside the left and right side walls 51A of the air duct 50, a pair of left and right mounting plates 52, which are gradually taller toward the back side, are formed rising from the bottom surface 50A. 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, and the front and rear hooking portions 53 are formed on the ceiling wall of the storage chamber 12. The air duct 50 is hooked by hooked portions (not shown) formed on the left and right peripheral surfaces of the window hole 34 formed in 12A, so that the bottom surface 50A of the air duct 50 has a downward slope toward the inner edge. It is designed to be supported by taking an inclined posture. Further, the front wall 51B of the air duct 50 is applied to the front edge on the lower surface side of the window hole 34 and fixed by screwing.
The suction port 36 described above is formed in the front side region of the bottom surface 50 </ b> A of the air duct 50, and a cooling fan 37 is attached to the back side of the suction port 36.

The rear edge of the bottom surface 50A is the deepest part of the air duct 50. A rear wall 51C is formed to rise across the entire width of the air duct 50, and is closer to the right end when viewed from the back than the center in the width direction of the rear wall 51C. The drainage channel 54 is formed at the position. The drainage channel 54 is formed in a groove shape with a U-shaped cross section whose bottom side is an arc shape. As shown in FIG. 4, the bottom wall continues downward from the bottom surface 50 </ b> A of the air duct 50 and descends toward the back side. The attitude that became.
Further, the rear wall 51C has a form in which the drainage channel 54 is formed at the farthest rear side and is retracted to the front side with a gentle inclination toward both ends.

  A heat transfer plate 55 is stretched on the bottom surface 50 </ b> A of the air duct 50. The heat transfer plate 55 is made of an aluminum plate, and as a whole, as shown in FIGS. 3 and 4, the heat transfer plate 55 is located slightly between the left and right mounting plates 52 on the bottom surface 50 </ b> A of the air duct 50 and from the front wall 51 </ b> B. It is formed in a substantially rectangular shape that fits in a region from the position to the close position with a predetermined interval from the back wall 51C. However, on the front side of the heat transfer plate 55, a notch 55A for allowing the cooling fan 37 to escape is formed. The heat transfer plate 55 is stretched at a predetermined position by fastening the front side with rivets, for example.

  Since the heat transfer plate 55 is stretched following the inclination of the air duct 50, the inner edge is inevitably the deepest part, and the receiving plate 56 rises over the entire width along the inner edge. A drain outlet 56A is formed at a position closer to the right end in the rear view than the center in the width direction in 56, that is, at a position corresponding to the drain passage 54 of the air duct 50 (see FIG. 14). Similarly to the back wall 51 </ b> C of the air duct 50, the receiving plate 56 has a configuration in which the formation position of the drain port 56 </ b> A protrudes to the farthest side and is retreated to the near side with a gentle inclination toward the left and right ends. A flange 57 is formed at the upper edge of the receiving plate 56 by being bent at a right angle to the inner side, and reaches the upper edge of the inner wall 51C of the air duct 50.

A cover 58 that covers the upper surface opening of the drainage channel 54 of the air duct 50 protrudes from the upper edge of the drainage port 56 </ b> A, and is slightly above the center height position of the drainage channel 54. It is fitted almost tightly across the area.
A freezing prevention heater 59A is wired from the back surface of the receiving plate 56 of the heat transfer plate 55 to the upper surface of the cover 58, and functions to prevent freezing in the front surface of the receiving plate 56 and the drainage channel 54.
In addition, you may wire another antifreeze heater 59B in the position corresponding to the lower surface of the front-end part of the cooler 26 in the bottom face of the heat-transfer plate 55. FIG.

In the present embodiment, means are provided to sufficiently raise the temperature of the front surface of the receiving plate 56 of the heat transfer plate 55, particularly the lower corner thereof, which will be described below.
As the means, a heater cover 60 that covers the entire upper surface and front surface of the linear heater portion 40A disposed at the rearmost portion of the defrosting heater 40 is provided over almost the entire length. The pair of left and right brackets 45 are provided between the rear ends.

The left and right brackets 45 will be described again. Each bracket 45 is formed by pressing a metal plate. As shown in FIGS. 4 and 5, each bracket 45 is wide and has a length dimension comparable to the length in the front-rear direction of the entire cooler 26 including the end plate 28. It is formed in a belt-like shape, and is made lighter by providing punch holes 46A at both front and rear end portions in the length direction, and is reinforced by bending side edges at right angles to form side plates 46B.
A positioning plate 47 having the same width is formed at a right angle at the rear edge of the bracket 45, and the upper edge of the positioning plate 47 is further bent at a right angle forward, and two insertion grooves 47A on the left and right sides are formed in the bent portion. Is formed.
On the other hand, a narrow attachment plate 48 rises from the center width position of the front edge, and an insertion hole 48A of a screw 49 is opened at the upper end thereof.

  As shown in FIG. 7, the bracket 45 is positioned along the side edge of the lower surface of the cooler 26 after the insertion groove 47A of the positioning plate 47 is inserted into the rear edge of the end plate 28 and positioned. As shown in FIG. 8, the mounting plate 48 is applied to the protection plate 32 bent at right angles outward from the front edge of the end plate 28, and the screw 49 passed through the insertion hole 48 </ b> A is changed to the screw hole formed in the protection plate 32. It is fixed by screwing.

The heater cover 60 is formed by pressing a metal plate, specifically, a material made of a stainless steel plate having a relatively low thermal conductivity, has a length comparable to the distance between the left and right end plates 28, and defrosts. The upper surface plate 61A and the front surface plate 61B that respectively cover the upper surface and the front surface of the heater portion 40A at the rearmost portion of the heater 40 are formed in an angled shape with a right angle. From the lower edge of the front plate 61B of the heater cover 60, a mounting plate 62 having a length larger than the distance between the left and right end plates 28 by a predetermined dimension is formed in a form bent at a right angle forward.
The mounting plate 62 of the heater cover 60 is passed to the rear end portions (positions closer to the predetermined dimension than the positioning plate 47) of the pair of left and right brackets 45 disposed at a predetermined interval, and is fixed by welding or the like.

Then, the effect | action of this embodiment is demonstrated.
When the defrost heater 40 is mounted on the lower surface of the cooler 26, for example, both brackets 45 in which the defrost heater 40, which is formed in a predetermined zigzag shape, is integrated via the heater cover 60, are integrated. At this time, the last heater section 40A is hidden under the heater cover 60. From this state, as shown in FIG. 7, after inserting and positioning a predetermined insertion groove 47A formed in the positioning plate 47 at the back edge of both brackets 45 on the rear edges of the left and right end plates 28, both brackets The left and right ends of the defrosting heater 40 are fitted into the mounting grooves 42 formed on the lower edges of the left and right end plates 28 while 45 is directed toward the left and right side edges on the lower surface of the cooler 26. Accordingly, both mounting plates 48 are brought into contact with the surface of the protection plate 32 formed on the front edge side of the end plate 28, so that the screws 49 passed through the insertion holes 48 </ b> A of the mounting plates 48 are formed on the protection plate 32. It is fixed by screwing into the hole.

As a result, the defrost heater 40 is attached to the lower surface of the cooler 26 in a predetermined routing shape and is supported by the bracket 45, and the defrost heater 40 is directly below the front most region on the lower surface of the fin group 27. Are arranged in a zigzag shape, and the rearmost linear heater portion 40A is arranged across the lower edge portions of the lower edges of the left and right end plates 28, and extends from the upper surface to the front surface of the heater portion 40A. It becomes the form covered with the heater cover 60.
When the cooler 26 is disposed in the cooler chamber 35, the rearmost heater portion 40 </ b> A passes through the rear opening of the heater cover 60 and the receiving plate 56 of the heat transfer plate 55, as shown in FIG. 6. It is in a state of facing the front surface with a predetermined distance.

As described above, the cooling operation is performed by circulating the cold air in the storage chamber 12, and if this is continued, the cooler 26 and the like may be gradually frosted. Frost operation is performed. The defrosting operation is performed by energizing and heating the defrosting heater 40 provided in the cooler 26 and energizing the antifreezing heaters 59A and 59B together.
The cooler 26 is heated by the defrost heater 40 to remove the frost, and the defrost water falls on the heat transfer plate 55 laid on the air duct 50 and flows down on the heat transfer plate 55. After being received by the receiving plate 56 of the heat transfer plate 55, the drainage of the back wall 12 </ b> B of the refrigerator main body 10 through the drainage channel 54 protruding from the drainage port 56 </ b> A of the receiving plate 56 to the back wall 51 </ b> C of the air duct 50. Drained into the service passage 19.
Further, the frost dropped in the ice block state is melted by the heat transfer plate 55 being heated by the heat release from the defrost heater 40 or the anti-freezing heater 59B, and further received by the receiving plate 56 as the ice block. A thing is also melt | dissolved because the receiving plate 56 is heated with the antifreezing heater 59A, and is drained with said defrost water.

  Here, when the amount of frost in the ice block state is large, there is a possibility that the ice block that has not melted still remains in the lower corner of the front surface of the receiving plate 56. On the other hand, in this embodiment, the rearmost linear heater portion 40A closest to the receiving plate 56 of the defrosting heater 40 is covered with the heater cover 60 whose rear surface is opened, that is, opened to the receiving plate 56 side. Therefore, the heat generated by the heater section 40 </ b> A is trapped in the heater cover 60 without being dissipated to the upper surface side or the front surface side, and is then radiated toward the receiving plate 56. Therefore, the receiving plate 56 is effectively heated, and the ice block remaining in the lower corner on the front surface is melted.

  As described above, in the present embodiment, among the defrost heaters 40 arranged on the lower surface of the cooler 26, the rear surface, that is, the receiving plate 56 side with respect to the last heater portion 40 </ b> A closest to the receiving plate 56 of the heat transfer plate 55. In this case, since the heater cover 60 is covered with an open heater cover, the heat generated by the heater section 40A acts so as to be radiated toward the receiving plate 56 after being trapped in the heater cover 60. As a result, the receiving plate 56 is effectively heated to melt the ice blocks remaining in the lower corners on the front surface thereof, so that the ice is frozen on the front surface of the receiving plate 56 and the drain port 56A is clogged. Can be prevented in advance.

Particularly in the present embodiment, the heater cover 60 is provided in a form that is passed between the back ends of the pair of brackets 45 that support the defrosting heater 40.
When the bracket 45 is mounted, the bracket 45 is fixed by screwing the front edge mounting plate 48 to the front edge protection plate 32 of the end plate 28 after positioning with the rear edge positioning plate 47. If the heater cover is not passed between the brackets 45, the brackets 45 must be screwed individually, so that the defrost heater 40 tends to shift from a fixed position, particularly when the first bracket 45 is mounted. This correction takes time and effort.
On the other hand, in this embodiment, the heater cover 60 is handed over and integrated with both brackets 45, so that the brackets 45 are applied to the lower surface of the cooler 26 with the defrosting heater 40 interposed therebetween. The mounting plates 48 can be alternately screwed little by little, so that both brackets 45 can be fixed without incurring a positional shift of the defrost heater 40, and as a result, the support operation of the defrost heater 40 can be performed quickly. Further, since the heater cover 60 is delivered and integrated, the function of reinforcing the bracket 45 can also be achieved.

<Embodiment 2>
9 and 10 show Embodiment 2 of the present invention. In the second embodiment, changes are made to the shape and mounting structure of the heater cover 65. In the following, changes will be mainly described, and members and parts having the same functions as those of the first embodiment will be denoted by the same reference numerals, and description thereof will be simplified or omitted.

In this embodiment, the heater cover 65 is arranged in such a manner that the heater cover 65 is passed to the opposing surfaces of the rear edge portions 28A of the left and right end plates 28 in the cooler 26.
Like the heater cover 60 of the first embodiment, the heater cover 65 has an angled shape including an upper plate 66A and a front plate 66B, but the upper plate 66A is wider than the upper plate 61A of the heater cover 60 of the first embodiment. Is formed. Mounting plates 67 are formed to rise on the left and right side edges on the front end side of the upper surface plate 66A.

  As shown in FIG. 9, the heater cover 65 has a rearmost heater portion 40A disposed below the approximate center width position of the upper surface plate 66A, and covers the upper surface and the front surface of the heater portion 40A. The left and right mounting plates 67 are fixed to the opposing surface of the end plate 28 by welding or the like. At this time, the rear edge of the upper surface plate 66 </ b> A of the heater cover 65 comes close to the front upper edge of the receiving plate 56 of the heat transfer plate 55. In addition, tapered escape portions 68 are formed at both left and right end portions of the rear edge of the upper surface plate 66A in order to avoid interference with the receiving plate 56.

In the second embodiment, similarly to the first embodiment, the heater portion 40A at the rearmost portion of the defrosting heater 40 is covered with a heater cover 65 opened on the receiving plate 56 side. After the heat generated in the heater cover 65 is trapped, the heat is radiated toward the receiving plate 56, so that the receiving plate 56 can be effectively heated.
On the other hand, during the cooling operation, the heater cover 65 functions so that the cool air from the cooler 26 is not directly applied to the front surface of the receiving plate 56 including the drain port 56A, and drainage is performed at the front surface of the receiving plate 56 and the drain port 56A. Becomes difficult to freeze.

<Embodiment 3>
A third embodiment of the present invention will be described with reference to FIGS. In this embodiment, the heater cover 70 is attached to the front surface of the receiving plate 56 of the heat transfer plate 55.
As shown in FIG. 13, the heater cover 70 has a short one disposed in the right region in the rear view of the drain port 56A on the front surface of the receiving plate 56 and a position near the left end of the drain port 56A. It is divided into two parts, a long one arranged in a wide area. Both of the heater covers 70 are formed in a substantially angle shape in which a front plate 71B having a short hanging length is formed on the front edge of the upper surface plate 71A, and is comparable to the height of the receiving plate 56 from the rear edge of the upper surface plate 71A. A mounting plate 72 having a drooping length is bent downward.

  Each heater cover 70 has its mounting plate 72 applied to the left and right regions sandwiching the drain outlet 56A on the front surface of the receiving plate 56, and is fixed by welding or the like. When the heater cover 70 is attached, the upper surface plate 71A extends from the upper edge of the receiving plate 56 over the rearmost heater portion 40A to the near side, and the front plate 71B is located at the upper position of the heater portion 40A. It is arranged in a form that covers the front.

  Also in the third embodiment, after the heat of the heater section 40A is trapped in the heater cover 70, the heat is radiated toward the receiving plate 56, and the radiant heat from the upper surface plate 71A heated therewith is also affected. By being applied to the front surface side of the receiving plate 56, the receiving plate 56 can be efficiently heated.

<Embodiment 4>
A fourth embodiment of the present invention will be described with reference to FIGS. In this embodiment, the heater cover 75 is arranged so as to be directly attached to the last heater section 40A of the defrost heater 40.
The heater cover 75 is provided with a mounting portion 77 having a semicircular groove shape that is tightly fitted to the upper surface side of the heater portion 40A on the upper edge of the front plate 76 that hangs down immediately before the last heater portion 40A. In addition, an extending plate 78 extending rearward from the rear edge of the mounting portion 77 in a slanting posture is formed. A recess 79 is formed in the extending edge of the extending plate 78 in a region excluding both ends in the length direction.

  The heater cover 75 is attached by attaching its attachment portion 77 tightly to the upper surface of the heater portion 40A, and accordingly, the front plate 76 covers and extends to a position immediately above the heat transfer plate 55 immediately before the heater portion 40A. The outlet plate 78 takes a downwardly inclined posture, and its extended end is close to the position immediately before the rear edge of the heat transfer plate 55.

According to the fourth embodiment, the heat of the heater section 40A is trapped in the heater cover 75 by the heater cover 75 without being diffused to the upper surface side or the front surface side, and then along the extension plate 78, Heat is radiated toward the lower corner of the front surface of the receiving plate 56, and the same portion can be efficiently heated.
In arranging the heater cover 75, the attachment portion 77 is simply fitted into the rearmost heater portion 40A itself, so that the attachment structure of the heater cover 75 is simplified.
In addition, even if the extension edge of the extension plate 78 comes into contact with the heat transfer plate 55 due to a change in the mounting posture of the heater cover 75 or the like, a recess 79 is notched and formed on the extension edge. Therefore, it is avoided that the defrost water flows down on the heat transfer plate 55.

<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.
(1) The present invention can be similarly applied to a type in which no anti-freezing heater is provided on the bottom surface of the heat transfer plate or the back surface of the receiving plate.
(2) In the fourth embodiment, a recess may be formed in the hanging edge of the front plate of the heater cover. With this structure, the hanging edge of the front plate contacts the heat transfer plate due to manufacturing or mounting errors. In this case, it is ensured that the defrost water flows down on the heat transfer plate through the recess.
(3) The air duct may be provided in a posture inclined downward toward one side wall of the refrigerator main body.
(4) The present invention is not limited to refrigerators, but is widely used in all kinds of cooling storages such as freezers, quick freezers, etc., in which the heat transfer plate receiving plate is heated by a part of the defrost heater arranged on the lower surface of the cooler. Can be applied.

  DESCRIPTION OF SYMBOLS 10 ... Refrigerator main body (storage main body) 12 ... Storage room 12B ... Back wall 19 ... Drainage passage (drainage part) 26 ... Cooler 27 ... Fin group 27A ... Fin 28 ... End plate 28A ... (Rear edge of end plate 28) Part 30 ... Evaporation pipe 35 ... Cooler room 40 ... Defrost heater 40A ... Heater part 45 ... Bracket 50 ... Air duct 51C ... Back wall 54 ... Drain channel 55 ... Heat transfer plate 56 ... Receiver plate 56A ... Drain port 60 ... Heater cover (Cover) 61A ... Upper plate 61B ... Front plate 62 ... Mounting plate 65 ... Heater cover (cover) 66A ... Upper plate 66B ... Front plate 67 ... Mounting plate 70 ... Heater cover (cover) 71A ... Upper plate 71B ... Front plate 72 ... Mounting plate 75 ... Heater cover (cover) 76 ... Front plate 77 ... Mounting portion 78 ... Extension plate 79 ... Recess

Claims (6)

On the ceiling of the storage body, a synthetic resin air duct that also serves as a drain pan is stretched in a slanting posture with a downward slope toward one side, thereby forming a cooler chamber in which a cooler is accommodated.
A defrost heater is attached to the lower surface of the cooler, and a heater part that forms a part of the defrost heater is disposed so as to cross the inner edge of the lower surface of the cooler,
On the back wall of the air duct, a drainage channel connected to a drainage part provided on the wall surface of the storage body is projected,
In addition, a metal heat transfer plate is laid on the air duct, and a receiving plate rises along the inner wall of the air duct and is connected to the drainage channel on the receiving plate. The drain is open,
The heater part in the defrost heater is provided with an open cover on the receiving plate side of the heat transfer plate. The defrost heater is supported and supported by a pair of brackets mounted along the left and right side edges on the lower surface of the cooler, and the cover is an end edge on the back side of the brackets. The cooling storage according to claim 1, wherein the cooling storage is provided in a form passed between the two. The cooler has a pair of end plates with protruding rear edges on the left and right sides of a fin group in which a large number of fins are arranged side by side, and the evaporation pipe meanders through the fin group and both end plates. The heater part of the defrost heater is mounted across the lower edges of the rear edge parts of the both end plates,
The cover is provided so as to be able to cover the upper surface side of the heater portion to a position close to the receiving plate, and is provided between the opposing surfaces of the rear edge portions of the both end plates. The cooling storage according to claim 1, wherein The cooling storage according to claim 1, wherein the cover is provided in a form extending from the upper edge of the receiving plate of the heat transfer plate to the front side through the upper portion of the heater portion. The cover includes a mounting portion that covers the front surface side from the upper surface of the heater portion and is fitted to the heater portion, and an extending plate that extends from the mounting portion to a position adjacent to the receiving plate. The cooling storage according to claim 1. The cooling storage according to claim 5, wherein a recess is cut out at an extension edge of the extension plate in the cover.

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