JP5788264B2 - refrigerator - Google Patents

Description

  Embodiments described herein relate generally to a refrigerator.

  Conventionally, for example, in a refrigerator for home use, a refrigerant pipe is arranged in a meandering manner in a cooler chamber and fins are attached to provide an evaporator configured as a horizontally long rectangular block as a whole, and on the outer surface portion of the evaporator. In addition, there has been known one in which a pipe heater for defrosting is attached in a meandering manner many times (see, for example, Patent Document 1). In this case, when the pipe heater is energized and generates heat during the defrosting operation, the frost attached to the evaporator is melted, and the defrosted water falls into a water receiving tray disposed below and is collected.

  By the way, in performing the defrosting operation, the evaporator has a different frosting state depending on its position, and therefore, in a portion where the amount of frosting (thickness) is large, the temperature rise is slower than in other portions, depending on the position. The frost melted differently and there was a situation where residual ice was likely to occur. Therefore, conventionally, a defrost sensor (temperature sensor) for determining the completion of defrosting is provided in a portion where the temperature rise is slow so as to cope with the difference in the degree of frost formation (the degree of frost melting) depending on the position. It was.

JP 2010-230212 A

  However, the above configuration is insufficient from the viewpoint of shortening the defrosting time (the energization time of the pipe heater), in other words, performing an efficient defrosting operation. Therefore, there is a demand in a refrigerator that performs defrosting with a pipe heater attached to an evaporator, and to improve the efficiency of the defrosting operation while suppressing the generation of residual ice in the evaporator.

In the first refrigerator of the embodiment, an evaporator is disposed in a cooler chamber provided in a back wall portion of a refrigerator body, and a heater wire in which a heating wire is wound around an insulating core member is placed in a metal pipe. A pipe heater for defrosting that is housed and configured is attached to the evaporator, and the pipe heater has a winding pitch of the heating wire in a part of the pipe heater than in other parts. By forming a narrow high-density winding portion, a high heat generation area in which the heat generation amount per unit length of the heater wire is larger than other portions is provided, and the high heat generation area of the pipe heater is The evaporator is arranged on the upstream side of the circulation of the cold air, and the cooler chamber is configured so that the cold air flows from the lower side to the upper side, and is located below the evaporator and defrosts. Water tray for receiving water The pipe heater has a protruding portion bent so as to protrude in a convex shape from the lower part of the evaporator toward the water receiving tray, and the high heat generation region is formed in the protruding portion. The protruding portion is configured to have a horizontal portion extending in the horizontal direction at the bottom, and the high-density winding portion is a portion other than the bent portion of the protruding portion, It is characterized by being arranged in the horizontal part .
In the second refrigerator of the embodiment, an evaporator is disposed in a cooler chamber provided in a back wall portion of the refrigerator body, and a heater wire in which a heating wire is wound around an insulating core member is placed in a metal pipe. A pipe heater for defrosting that is housed and configured is attached to the evaporator, and the pipe heater has a winding pitch of the heating wire in a part of the pipe heater than in other parts. By forming a narrow high-density winding portion, a high heat generation area in which the heat generation amount per unit length of the heater wire is larger than other portions is provided, and the high heat generation area of the pipe heater is The evaporator is arranged on the upstream side of the circulation of the cold air, and the cooler chamber is configured so that the cold air flows from the lower side to the upper side, and is located below the evaporator and defrosts. Water tray for receiving water The pipe heater has a protruding portion bent so as to protrude in a convex shape from the lower part of the evaporator toward the water receiving tray, and the high heat generation region is formed in the protruding portion. The projecting portion has a horizontal portion extending in the horizontal direction at the lowermost portion, and has an inclined portion longer than the horizontal portion extending obliquely on the left and right sides thereof, and the high-density winding The turning portion is a portion other than the bent portion of the projecting portion, and is characterized in that it is disposed at both the inclined portions.

The front view which shows 1st Embodiment and is a vertical section of an evaporator part The perspective view from the lower surface side of the evaporator part which shows the arrangement condition of a pipe heater The figure which shows the structure (a) of the structure (a) of a pipe heater, and one part of the heater wire among them Longitudinal right side view schematically showing the overall structure of the refrigerator body FIG. 1 equivalent view showing the first reference form FIG. 1 equivalent diagram showing the second embodiment FIG. 1 equivalent diagram showing a second reference form FIG. 1 equivalent diagram showing the third reference form

(1) First Embodiment Hereinafter, a first embodiment will be described with reference to FIGS. 1 to 4. FIG. 4 schematically shows the overall configuration of the refrigerator main body 1 in the present embodiment. The refrigerator main body 1 is configured by providing a plurality of storage chambers in a vertically long rectangular box-shaped heat insulating box 2 having an open front surface. Specifically, in the heat insulation box 2, a refrigerator compartment 3, a vegetable compartment 4, a second freezing compartment (switching compartment) 5, and a freezing compartment 6 are provided in order from the top. Although not shown, the portion of the heat insulation box 2 where the second freezing chamber 5 is provided is divided into two chambers on the left and right, the second freezing chamber 5 is provided on the right side, and the ice making chamber is provided on the left side. It has been.

  The refrigerator compartment 3 and the vegetable compartment 4 are both storage compartments in a refrigeration temperature zone (for example, 1 to 4 ° C.), and are partitioned vertically by a plastic partition wall 7. A hinged heat insulating door 8 is provided on the front surface of the refrigerator compartment 3, and a drawer heat insulating door 9 is provided on the front surface of the vegetable compartment 4. A storage container 10 is connected to the back surface of the heat insulating door 9. The inside of the refrigerator compartment 3 is divided into a plurality of stages in the vertical direction by a shelf plate 11, and a chilled chamber 12 is provided at the lowest part (upper part of the partition wall 7).

  The second freezing room 5 and the freezing room 6 (and the ice making room) are both storage rooms in a freezing temperature zone (for example, −10 to −20 ° C.), and the vegetable room 4 and the second freezing room 5 ( And the ice making chamber) are partitioned vertically by a heat insulating partition wall 13. A drawer-type heat insulating door 14 is provided on the front surface of the second freezer compartment 5, and an ice storage container 15 is connected to the back surface of the heat insulating door 14. A drawer-type heat insulating door 16 is also provided on the front surface of the freezer compartment 6, and a storage container 17 is connected to the rear surface of the storage container 17 in two stages.

  Although not shown in detail in the refrigerator main body 1 as a whole, the refrigerator 20 for cooling the refrigerator compartment 3 and the vegetable compartment 4 and the ice making chamber 5 and the freezer compartment 6 for cooling the refrigerator compartment 6 are cooled. A refrigeration cycle including two evaporators (coolers) with the evaporator 21 for the freezer compartment is incorporated. A machine room 22 is provided on the back side of the lower end of the refrigerator body 1, and although not shown in detail, a compressor 23 and a condenser that constitute a refrigeration cycle are disposed in the machine room 22. A cooling fan, a defrosted water evaporating dish 24, and the like are disposed. A control device 25 in which a microcomputer or the like for controlling the whole is mounted is provided near the lower rear portion of the refrigerator body 1.

  A cooler room 26 for the freezer compartment is provided on the lower side (rear part of the freezer compartment 6) of the back wall in the refrigerator main body 1. In the cooler chamber 26, the evaporator 21, the accumulator 27 (see FIG. 1) and the like are disposed at the lower portion, and the refrigeration blower fan 28 is disposed at the upper portion. . A pipe heater for defrosting is attached to the evaporator 21, and the structure will be described in detail later. A cool air outlet 29 is provided at the upper front of the cooler chamber 26, and a return port 30 is provided at the lower end.

  Thus, after the refrigeration blower fan 27 is driven, the cold air generated by the evaporator 21 is supplied from the cold air outlet 29 into the second freezer compartment 5 (and the ice making compartment) and the freezer compartment 6. Circulation is performed such that the return port 30 is returned to the freezer cooler chamber 26. Accordingly, in the evaporator 21 portion, cool air flows from the lower side to the upper side, and the lower part of the evaporator 21 is the upstream side and the upper part is the downstream side. In addition, as shown also in FIG. 1, the water tray 31 which receives defrost water is provided in the lower part of the evaporator 21. As shown in FIG.

  On the back wall portion of the refrigerator main body 1, there is provided a cooler chamber 32 for the refrigerating chamber located on the upper side (rear portion of the chilled chamber 12) and provided with the evaporator 20 for the refrigerating chamber. A blowout duct 33 is provided extending upward from the upper part. Further, an air duct 34 is provided at the lower part of the cooler room 32 (the rear part of the vegetable room 4) and the upper end is connected to the cooler room 32, and a refrigeration air fan 35 is provided in the air duct 34. ing. In addition, a water receiving portion 36 for receiving defrost water is provided at the bottom of the cooler chamber 32, located below the evaporator 20.

  Thus, when the refrigeration blower fan 35 is driven, the cold air generated by the evaporator 20 is supplied to the refrigeration chamber 3 from the plurality of outlets 33 a that open in the refrigeration chamber 3 through the blowout duct 33. And further supplied to the vegetable compartment 4. Then, the air in the vegetable compartment 4 is circulated by being sucked into the blower duct 34 from the suction port 34a provided in the blower duct 34 and returned to the cooler compartment 32 for the refrigerator compartment. .

  Here, the evaporator 21 for the freezer will be described with reference to FIGS. As shown in FIG. 1, the evaporator 21 is formed by attaching a plurality of cooling fins 38 formed in a strip shape from an aluminum thin plate to a long refrigerant pipe 37 made of, for example, aluminum. The well-known structure arrange | positioned in the meandering form so that it may extend in the left-right direction between 39,39 is provided. In this case, as shown in FIG. 2, the evaporator 21 is formed in a rectangular parallelepiped shape having a substantially square side surface in the horizontal direction when viewed as a whole.

  As shown in FIG. 1, the water tray 31 provided in the cooler chamber 26 below the evaporator 21 has a rectangular container shape that is slightly longer to the left and right than the evaporator 21. A defrosting water outlet 31a is provided, and the inner bottom portion is gently inclined downward toward the outlet 31a. The defrost water received by the water receiver 31 is led from the discharge port 31a through a pipe (not shown) to the defrost water evaporating dish 24 in the machine chamber 22 to evaporate.

  As shown in FIG. 1, an accumulator 27 connected to the outlet side of the refrigerant pipe 37 is provided on the left rear portion of the evaporator 21. Although not shown, the accumulator 27 is provided with a defrost sensor comprising a temperature sensor for detecting (determining) completion of the defrost operation.

  A long pipe heater 40 for defrosting is attached to the evaporator 21 so that the outer surface of the evaporator 21 is meandered. As shown in FIG. 3A, the pipe heater 40 is configured by accommodating a heater wire 41 in a metal pipe, in this case, an aluminum pipe 42, and connector parts 43 made of an insulating material (heat insulating material) at both ends thereof. have. In addition, a lead wire 44 for energization is led out from each connector portion 43. As shown in FIG. 3B, the heater wire 41 is configured by winding a heating wire 46 around a core material 45 made of an insulating material (for example, glass) and covering it with an insulator 47 made of silicon rubber. . At this time, as will be described later, in the present embodiment, the winding pitch of the heating wire 46 is variable depending on the portion of the heater wire 41.

  FIG. 2 shows a specific arrangement state of the pipe heater 40 with respect to the evaporator 21. Here, for convenience, the front side of the evaporator 21 is directed upward and the lower surface side is directed to the front. That is, the connector 41 portion on one end side of the long pipe heater 40 is disposed on the left side of the front surface of the evaporator 21, and the pipe heater 40 starts from the upper left portion of the front surface of the evaporator 21 from the upper surface and front surface of the evaporator 21. Is extended to the right end of the evaporator 21 to the right. This portion extending to the left and right is referred to as a first parallel portion 40a.

  The pipe heater 40 is folded in a U-turn shape slightly downward from the right end portion (front side in FIG. 2), and the front portion of the evaporator 21 is now extended leftward (second parallel portion 40b). The front end of the evaporator 21 extends rightward (third parallel portion 40c) at the left end portion of the evaporator 21 and is folded downward again at the right end portion of the evaporator 21 into a U-turn shape. A side portion (ridge portion) formed by the front surface and the lower surface extends leftward to the left end portion of the evaporator 21 (fourth parallel portion 40d).

  Next, the pipe heater 40 is folded back in a U-turn shape from the left end portion of the side (ridge) formed by the front surface and the lower surface of the evaporator 21 to the rear (lower side in FIG. 2), and the lower surface portion of the evaporator 21 is moved. Extends to the right (fifth parallel portion 40e), folds back again in a U-turn shape at the right end of the evaporator 21, extends the bottom surface of the evaporator 21 to the left (sixth parallel portion 40f), and the left end of the evaporator 21 The side portion is folded back again in a U-turn shape, and a side portion (ridge portion) formed by the lower surface and the rear surface of the evaporator 21 extends rightward to the right end portion of the evaporator 21 (seventh parallel portion 40g).

  Thereafter, the pipe heater 40 is folded back in a U-turn shape from the right end of the side portion (ridge portion) formed by the lower surface and the rear surface of the evaporator 21 to the upper side (the rear side in FIG. 2). The surface portion extends to the left (eighth parallel portion 40h), and at the left end portion of the evaporator 21 folds upward once again in a U-turn shape, and the rear surface portion of the evaporator 21 extends rightward (the ninth parallel portion 40i). The upper edge of the evaporator 21 is turned up again in a U-turn shape, and the side (ridge) formed by the rear surface and the upper surface of the evaporator 21 extends leftward to the left edge of the evaporator 21 (the tenth parallel portion 40j). It is connected to the connector part 43 on the side.

  At this time, in this embodiment, before and after the fifth parallel part 40e and the sixth parallel part 40f arranged on the lower surface side of the evaporator 21 of the pipe heater 40 bulge in a convex shape on the water tray 31 side, that is, downward. Two protruding portions 48 and 48 are provided. As shown in FIG. 1, these protrusions 48, 48 have a horizontal portion extending in the horizontal direction at the lowermost portion which is a central portion, and the horizontal portions extending obliquely on the left and right via bent portions, respectively. It has an inclined part longer than the part. These protrusions 48 and 48 are configured so as to be along the bottom surface of the water tray 31, and are disposed close to the bottom surface.

  Now, in the pipe heater 40 described above, a high heat generation region 49 in which the heat generation amount per unit length of the heater wire 41 is larger than the other portions is provided in a part thereof. 1 and 2, the high heat generation region 49 is indicated by hatching for convenience. As shown in FIG. 3B, the high heat generation region 49 includes a high-density winding portion 41a in the heater wire 41 in which the winding pitch of the heating wire 46 is narrower (for example, 1/2) than other portions. It is comprised by forming. In FIG.3 (b), the high-density winding part 41a is arrange | positioned in the center part of the heater wire 41, and the part with a larger winding pitch located in the both sides is called the low-density winding part 41b.

  Accordingly, in the high heat generation region 49 in which the heater wire 41 is the high-density winding portion 41a in the pipe heater 40, for example, the heat generation amount is 40 W / m, and the other portion, that is, the heater wire 41 has a low density. In the portion designated as the winding portion 41b, the heat generation amount is 20 W / m. And in this embodiment, as shown in FIG.1 and FIG.2, the high heat_generation | fever area | region 49 of the pipe heater 40 is the lower surface side which is the upstream of the distribution | circulation of cold air | fever among the evaporator 21, and protrusion part 48,48 ( Of the fifth parallel part 40e and the sixth parallel part 40f), the horizontal part extends in the horizontal direction. In this case, the high-density winding portion 41 a of the heater wire 41 is arranged so as not to come to the bent portions of the protruding portions 48 and 48.

  Although not described in detail, the control device 25 controls the refrigeration cycle compressor 23, a switching valve (not shown), and the like, and also controls the refrigeration blower fan 28 and the refrigeration blower fan 35 to perform a cooling operation. Execute. At the same time, the control device 25 periodically performs a defrosting operation on the evaporator 21 for freezing (for example, once every few hours for several minutes). This defrosting operation is performed by energizing the pipe heater 40 in a state where the supply of the refrigerant to the evaporator 21 is stopped, and the defrosting operation is terminated when the defrost sensor detects a predetermined temperature.

  Next, operations and effects of this embodiment will be described. In the above-described refrigerator, when outside air containing moisture (water vapor) enters the freezer compartment 6 by using the open / close of the heat insulating door 16 (in / out of the storage container 17) or the like with use, the freezer The refrigeration evaporator 21 in the cooling chamber 26 sublimates and frost adheres. At this time, in the lower portion of the evaporator 21 located upstream of the cold air flow, wet air is first touched, so that frost is easily formed, and the amount of frost (thickness) compared to the upper portion which is the downstream portion. ) Is growing.

  As described above, when the defrosting operation is performed on the evaporator 21, the pipe heater 40 attached to the outer surface of the evaporator 21 is energized, the frost is melted by the heat generated by the pipe heater 40, and the defrost water drops. Then, it is received by the water tray 31 and discharged. At this time, in the present embodiment, a part of the defrosting pipe heater 40 is provided with a high heat generation region 49 in which the heat generation amount per unit length is larger than that of the other part, and the protruding part located in the lower part of the evaporator 21 Since it has arrange | positioned in 48,48 (5th parallel part 40e and 6th parallel part 40f), the ability to melt | dissolve the frost of this part can be made higher.

  Accordingly, when performing the defrosting operation, a portion of the evaporator 21 where frost formation is large is heated with a large calorific value, and a portion where the frost formation is not so large is heated with a relatively small (normal) calorific value. Can do. As a result, unlike the conventional one in which the frost melts differently depending on the position in the evaporator and the residual ice tends to be generated, the evaporator 21 as a whole can be efficiently (rationally) heated, and the residual ice The defrosting operation can be completed in a short time while suppressing the above.

  Further, in the present embodiment, since the high heat generation region 49 can be realized by the internal structure of the pipe heater 40 (change in the winding density of the heating wire 46), the arrangement form (outer shape) of the pipe heater 40 is complicated. For example, the configuration can be made relatively simple as compared with, for example, two pipe heaters having different calorific values.

  Further, particularly in the present embodiment, the water receiving tray 31 that receives the defrost water is disposed below the evaporator 21, and the pipe heater 40 is provided with projecting portions 48 and 48 that bulge downward downward. In addition, since the high heat generation region 49 is disposed in the horizontal portion of the projecting portions 48, 48, the water receiving tray 31 is heated with a high heat generation amount during the defrosting operation, and the ice in the discharge port 31a of the water receiving tray 31 is exhibited. It is possible to reliably prevent clogging and the like due to the above. In this case, since the high-density winding portion 41a for forming the high heat generation region 49 is not disposed at the bent portions of the protrusions 48 and 48, the stress on the internal heating wire 46 can be reduced.

(2) Second Embodiment, the first to third reference embodiment
FIG. 6 shows a second embodiment. FIGS. 5, 7, and 8 show the first, second, and third reference forms, respectively. This RaMinoru facilities embodiment and reference forms, the a differs from the first embodiment, the pipe heaters 40 for defrosting to be additionally provided to the evaporator 21, the position of the high heat generating area (high density winding portion) is there. Accordingly, the same parts as those in the first embodiment are denoted by the same reference numerals and detailed description thereof is omitted, and the differences from the first embodiment will be described below. For convenience, the same symbol “40” is attached to the pipe heater 40. The same code | symbol is attached | subjected also about the 1st-10th parallel parts 40a-40j.

That is, FIG. 5 shows the pipe heater 40 in the first reference form . In this reference form , the pipe heater 40 is also attached in a meandering manner over the front surface portion, the lower surface portion, and the rear surface portion of the evaporator 21, and the first to tenth parallel portions 40a to 40j are connected to each other. Have. Of these, the fifth parallel part 40e and the sixth parallel part 40f are projecting parts 48 and 48 that bulge to the water tray 31 side, and the action of heating the water tray 31 is obtained.

And in this 1st reference form , instead of providing the high heat_generation | fever area | regions 49 and 49 in the horizontal part of the protrusion parts 48 and 48 of the said 1st Embodiment, the edge part which the front surface and lower surface of the evaporator 21 make | form The fourth parallel part 40d extending in the left-right direction (ridge part) and the side part (ridge part) formed by the lower surface and the rear surface of the evaporator 21 are located in the seventh parallel part 40g part extending in the left-right direction, resulting in high heat generation. A region 51 (for convenience, the fourth parallel portion 40d is indicated by hatching) is provided. That is, the high heat generation region 51 is disposed on the lower side of the evaporator 21 that is the upstream side of the cold air flow.

  The high heat generation region 51 is also configured by forming a high-density winding portion 41a in which the winding pitch of the heating wire 46 is narrower than that of other portions in the heater wire 41, and the heat generation amount is set to 40 W / m, for example. ing. Moreover, in the other part (low density winding part 41b), the emitted-heat amount is 20 W / m, for example.

Therefore, also in this 1st reference form , when performing defrost operation by the pipe heater 40 which has the high heat_generation | fever area | region 51, the part with big frost formation of the evaporator 21 is heated with a big emitted-heat amount, and frost formation is carried out. The portion which is not so large can be heated with a relatively small (normal) calorific value. As a result, the evaporator 21 as a whole can be efficiently (reasonably) heated with a relatively simple configuration, and the defrosting operation can be completed in a short time while suppressing residual ice.

FIG. 6 shows a second embodiment. In this embodiment, the fifth parallel portion 40e and the sixth parallel portion 40f arranged on the lower surface portion of the evaporator 21 in the pipe heater 40 are composed of a horizontal portion and an inclined portion and swell toward the water tray 31 side (downward). Protruding portions 48 and 48 are provided, and a high heat generation region 52 is provided in the protruding portions 48 and 48. At this time, for the sake of convenience, as shown by hatching in the figure, the high-density winding portion 41a is provided on the left and right inclined portions of the protruding portions 48, 48, and the high-density winding portion 41a is horizontal. It is located in a plurality of places (alternately) with the low density winding part 41b located in the part. Moreover, the high density winding part 41a is arrange | positioned in parts other than a bending part.

  In this configuration, since the high-density winding part 41a is arranged on the inclined part longer than the horizontal part in the protruding part 48, the high-density winding part 41a is secured longer than in the case where it is provided on the horizontal part. be able to. In addition, in the inclined portion having the high-density winding portion 41a, the heat generation amount is larger than that in other portions, but the heat generation amount can be sufficiently increased also in the horizontal portion by heat conduction, and the entire protrusion 48 is not necessarily provided. A high heating effect can be obtained without providing a high-density winding part.

Therefore, also in this 2nd Embodiment, when performing a defrost operation similarly to the said 1st Embodiment, the part with big frost formation of the evaporator 21 is heated by a big emitted-heat amount, and frost formation is so much. The part which is not large can be heated with a relatively small (normal) calorific value. As a result, the evaporator 21 as a whole can be efficiently (reasonably) heated with a relatively simple configuration, and the defrosting operation can be completed in a short time while suppressing residual ice. In addition, since the high heat generation region 52 is disposed in the protrusion 48, the water tray 31 can be heated with a high heat generation amount during the defrosting operation, and the discharge port 31a can be reliably prevented from being clogged with ice. It becomes. Furthermore, since the high-density winding part 41a is not disposed at the bent part of the protruding part 4, it is possible to reduce the stress on the internal heating wire 46.

FIG. 7 shows a second reference form . In this reference form , in the pipe heater 40, a fourth parallel portion 40d extending in the left-right direction at a side portion (ridge portion) formed by the front surface and the lower surface of the evaporator 21 and the upper portion thereof are positioned on the front surface side of the evaporator 21. The third parallel portion 40c is provided with a high heat generation region 53 (shown by hatching in the drawing for convenience). Thereby, in addition to providing the high heat generation area 53 in the lower part of the evaporator 21 (upstream side of the cold air flow), the high heat generation area 53 is also provided on the front side of the evaporator 21.

  Here, in the evaporator 21, as described above, the lower part (upstream side of the circulation of cold air) is more likely to form frost than the upper part, and there is a situation in which the amount (thickness) of frost is increased. In general, in the evaporator 21, the temperature closer to the freezer compartment 6, that is, the front side is lower than the rear side, so that frost easily forms and the amount (thickness) of frost is large. There are circumstances to become.

Therefore, according to the second embodiment , the pipe heater 40 is provided with the high heat generation region 53 located on the lower side and the front side of the evaporator 21, so that the frost melting of the evaporator 21 during the defrosting operation is achieved. The condition (temperature rise degree) can be made even more uniform, and the defrosting operation can be performed efficiently.

FIG. 8 shows a third reference form . In the third reference embodiment , in the pipe heater 40, a high heat generation region 54 (shown by hatching in the drawing for convenience) is provided in the fourth parallel portion 40d and the second parallel portion 40c. According to this, the lower part and the front side of the evaporator 21 can be heated with a high calorific value during the defrosting operation, and the degree of frost melting (temperature increase degree) of the evaporator 21 during the defrosting operation is The defrosting operation can be performed efficiently evenly.

  In each of the above embodiments, since the refrigeration evaporator 20 has almost no frost formation, a heater for defrosting was not particularly provided. However, this refrigeration evaporator 20 also has a defrosting pipe. A heater can be provided, and also in this case, a high heat generation region (high density winding portion) can be provided as necessary. In each of the above embodiments, in the evaporator 21 for the freezer compartment, the cool air flows from the bottom to the top. However, the flow direction of the cool air may be from the top to the bottom or in the horizontal direction. The same effect can be obtained by arranging the high heat generation region on the upstream side. As the outer shape of the evaporator, it may be thin in the front and rear, or thin in the top and bottom.

  In each of the above embodiments, the pipe heater 40 is provided with a high-density winding portion and a low-density winding portion in which the winding pitch (density) of the heating wire 46 is changed. You may employ | adopt the pipe heater which changed winding pitch (density) and the emitted-heat amount in 3 steps | paragraphs (for example, 40 W / m, 30 W / m, 20 W / m). It is also possible to change to more than four stages. In addition, it is not limited to each above-mentioned embodiment, for example, composition (arrangement) of each room of a refrigerator main part, position where a cooler etc. are provided, shape of a water pan, arrangement form of a pipe heater (direction of meandering) Further, various modifications can be made with respect to the shape and presence / absence of the protruding portion, and the like, and the like, and the like can be appropriately changed and implemented within a range not departing from the gist.

  In the drawings, 1 is a refrigerator body, 21 is an evaporator, 26 is a cooler chamber, 31 is a water tray, 40 is a pipe heater, 40a to 40j are first to tenth parallel parts, 41 is a heater wire, and 41a is a high-density winding. Rotating part, 41b is a low density winding part, 42 is an aluminum pipe (metal pipe), 45 is a core material, 46 is a heating wire, 48 is a protruding part, 49, 51, 52, 53 and 54 are high heating areas. .

Claims (4)

For defrosting, in which an evaporator is disposed in the cooler chamber provided on the back wall of the refrigerator main body, and a heater wire in which a heating wire is wound around an insulating core is housed in a metal pipe A pipe heater attached to the evaporator,
In the pipe heater, by forming a high-density winding part in which the winding pitch of the heating wire is narrower than that of the other part, the amount of heat generated per unit length of the heater wire is different from that of the pipe heater. A high heat generation area larger than the part is provided,
The high heat generation area of the pipe heater is arranged on the upstream side of the cold air flow in the evaporator ,
The cooler chamber is configured so that cold air flows from below to above, and a water tray for receiving defrost water is provided below the evaporator,
The pipe heater has a protruding portion bent so as to bulge out from the lower part of the evaporator toward the water receiving tray, and the high heat generation region is provided in the protruding portion. The protrusion has a horizontal portion extending in the horizontal direction at the bottom,
The high-density winding part is a part other than the bent part in the protruding part, and is arranged in the horizontal part . For defrosting, in which an evaporator is disposed in the cooler chamber provided on the back wall of the refrigerator main body, and a heater wire in which a heating wire is wound around an insulating core is housed in a metal pipe A pipe heater attached to the evaporator,
In the pipe heater, by forming a high-density winding part in which the winding pitch of the heating wire is narrower than that of the other part, the amount of heat generated per unit length of the heater wire is different from that of the pipe heater. A high heat generation area larger than the part is provided,
The high heat generation area of the pipe heater is arranged on the upstream side of the cold air flow in the evaporator,
The cooler chamber is configured so that cold air flows from below to above, and a water tray for receiving defrost water is provided below the evaporator,
The pipe heater has a protruding portion bent so as to bulge out from the lower part of the evaporator toward the water receiving tray, and the high heat generation region is provided in the protruding portion. The projecting portion has a horizontal portion extending in the horizontal direction at the lowermost portion, and has left and right inclined portions longer than the horizontal portion extending obliquely,
The high-density winding part is a part other than the bent part in the projecting part, and is disposed in both the inclined parts . The refrigerator according to claim 1 or 2, wherein the high heat generation region of the pipe heater is provided on a further front side of the evaporator . The high heat generation area of the pipe heater has a high density winding portion where the winding pitch of the heating wire is narrow, and a plurality of locations sandwiching a low density winding portion where the winding pitch of the heating wire is wider than that. The refrigerator according to any one of claims 1 to 3, wherein the refrigerator is provided.

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