JP2013160463A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric power saving refrigerator by stably draining the defrosting water of an evaporator surface to shorten a defrosting time.SOLUTION: In a refrigerator 100 provided with an evaporator 111 arranged in a storage chamber 106 and having a film which makes it easy to drop defrosting water generated on a surface from the surface, and a supply fan 112 for sending cold air cooled by the evaporator 111 in the storage chamber 106, the evaporator 111 is provided with fins 151 on the surface. A plurality of rows of grooves 153 are linearly provided in a direction having gravity direction components on surfaces of the fins 151 of the evaporator 111. Draining the performance of the defrosting water generated on the surfaces of the fins 151 is improved, and even if the film is deteriorated due to aging or the like, draining can be stably performed since the defrosting water goes along the grooves 153, early frost generation with remaining water as a starting point can be prevented to shorten a defrosting time, and the electric power saving refrigerator can be provided.

Description

  The present invention relates to a refrigerator provided with an evaporator having a high energy saving effect.

  It is well known that the amount of power consumed by refrigerators occupies the top rank among electric appliances in general households. This is because, unlike other electric devices, power is normally continuously supplied for 24 hours. Therefore, in order to save power (energy saving) in ordinary households, it is required to save power in the refrigerator.

  In a general refrigerator, hot and humid air around the refrigerator flows into the cabinet when the door is opened and closed. The humid air circulates in the chamber, and when passing through the evaporator, water vapor in the air condenses on the surface of the evaporator, and the adjacent condensed water grows by coalescence, etc., and condenses through a supercooled state. Water freezes and frost grows in a needle shape with the frozen portion as a core, forming a frost layer. This is a so-called frost phenomenon. As frost forms on the evaporator surface, the air flow resistance increases, the air volume decreases, the cooling capacity decreases, and the prescribed cooling performance cannot be maintained.

  In order to avoid such a decrease in cooling capacity, a defrosting operation is periodically performed. The defrosting operation method includes, for example, a hot gas method that heats the evaporator from the inside by switching the refrigerant flow in the refrigeration cycle, and a heater method that heats the evaporator from the outside with a heater provided near the evaporator. Since the original function as an evaporator is not played during frost operation, it is necessary to shorten the defrosting time as much as possible.

  However, if the defrosting time is easily shortened and the cooling operation is restarted with the defrosted water remaining on the fin surface, the defrosted water itself becomes ventilation resistance or the remaining defrosted water is the starting point. As a result, frost is generated at an early stage, and as a result, the interval of the defrosting operation is shortened, and the power consumption is increased. For this reason, an evaporator with high drainage performance leads to a shortening of the defrosting time, and power saving of the refrigerator can be achieved.

  The conventional technology related to the drainability of this evaporator is that after the surface of the evaporator is washed, an anodizing treatment is performed to form a film having a plurality of fine holes on the surface, and a heat treatment is performed without stabilizing the fine holes. Thus, the hydrophilicity of the surface is increased to improve drainage performance (see, for example, Patent Document 1).

JP 2010-175131 A

  However, the conventional configuration has room for improvement in order to obtain stable draining performance.

  In the conventional method, the hydrophilicity of the surface property by anodizing treatment is very expensive, and when the hydrophilic performance of the surface deteriorates, the defrost water continues to stay in the narrow hole and the drainage performance becomes extremely May be reduced.

In order to solve the above-mentioned conventional problems, the refrigerator of the present invention is installed in a storage room, and has an evaporator having a film that makes it easy to drop defrosted water generated on the surface from the surface, and the evaporator In the refrigerator comprising a blower fan that blows cool air cooled in the storage chamber, a plurality of rows of grooves are linearly provided in a direction having a gravity direction component on the fin surface of the evaporator.

  As a result, in addition to having a film that makes it easy to drop the defrost water from the surface, the defrost water is guided (guided) through the groove, so that the defrosting water drainability is improved from the evaporator surface. The defrost water can be drained stably from the evaporator surface.

  The refrigerator of this invention can shorten the defrost time by stably draining the defrost water which arises in an evaporator at the time of a defrost operation, and can provide the refrigerator which saved power.

The longitudinal cross-sectional view of the refrigerator in Embodiment 1 of this invention The longitudinal cross-sectional view of the basic structure of the principal part storage chamber of the refrigerator in Embodiment 1 of this invention The enlarged view of the evaporator of the refrigerator in Embodiment 1 of this invention Longitudinal sectional view of the refrigerator in the second embodiment of the present invention The longitudinal cross-sectional view of the basic structure of the principal part storage chamber of the refrigerator in Embodiment 2 of this invention The enlarged view of the evaporator of the refrigerator in Embodiment 2 of this invention Vertical sectional view of the refrigerator in the third embodiment of the present invention The longitudinal cross-sectional view of the basic structure of the principal part storage chamber of the refrigerator in Embodiment 3 of this invention The enlarged view of the evaporator of the refrigerator in Embodiment 3 of this invention

  1st invention is installed in the storage chamber, the evaporator which has a membrane | film | coat which makes it easy to drop the defrost water generated on the surface from the said surface, and the cold air cooled with the said evaporator in the said storage chamber In the refrigerator provided with an air blowing fan, the evaporator has fins on the surface, and grooves are provided on the fin surfaces of the evaporator, whereby defrosted water generated on the surface of the evaporator. In addition to improving draining performance, even when the film is deteriorated, defrosted water can be stably drained because it passes through the groove, leading to a reduction in defrosting time and providing a power-saving refrigerator. it can.

  According to a second invention, in the first invention, the groove is provided linearly in a direction having a gravity direction component, and the defrost water falls along the groove due to its own weight, so that it is more stable. Drainability can be improved.

  According to a third invention, in the first or second invention, the grooves are provided in a plurality of rows, and the defrost water can be drained more reliably from the entire surface of the evaporator.

  According to a fourth invention, in any one of the first to third inventions, the groove is provided by pressing, and can be configured very inexpensively and easily.

  According to a fifth invention, in any one of the first to fourth inventions, the surface of the evaporator is provided with a super water-repellent film having a water contact angle of 160 degrees or more, and more reliably from the evaporator surface. The defrosted water can be drained.

A sixth invention is the invention according to any one of the first to fifth aspects, wherein the blower fan blows air in a direction having a gravity direction component, and even if defrost water stays on the evaporator surface, By blowing the defrost water in the same direction as the weight of the defrost water when the cooling operation is resumed, the remaining defrost water can be drained by the force of the blow.

  Hereinafter, the present embodiment will be described with reference to the drawings. The same reference numerals are given to the same configurations as those of the conventional example or the above-described embodiment, and the detailed description thereof will be omitted. The present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of the refrigerator according to Embodiment 1 of the present invention. FIG. 2 is a vertical cross-sectional view of the basic structure of the main part storage room of the refrigerator in the first embodiment of the present invention. FIG. 3 is an enlarged view of the evaporator of the refrigerator in the first embodiment of the present invention.

  In FIG. 1, a heat insulating box 101 of a refrigerator 100 includes an outer box 102 mainly using a steel plate and an inner box 103 molded of a resin such as ABS, and the inside thereof is made of, for example, hard foam urethane or the like. It is filled with foam heat insulating material and insulated from the surroundings, and is partitioned into a plurality of storage chambers 104, 105, 106 by heat insulating partition walls 120, 121.

  Each storage chamber has its front opening closed by heat insulating doors 117, 118, and 119 pivoted to the refrigerator main body.

  For example, assuming that the storage rooms 104, 105, and 106 are a refrigerated room, a vegetable room, and a freezer room, respectively, the refrigerated room is normally set to 1 ° C to 5 ° C at the lower limit for freezing for refrigerated storage, and the vegetable room is refrigerated. The temperature is set to 2 ° C to 7 ° C, which is the same as or slightly higher than that of the room. The freezer compartment is set in a freezing temperature zone, and is usually set at −22 ° C. to −15 ° C. for frozen storage. For improving the frozen storage state, for example, −30 ° C. or −25 ° C. Sometimes set at low temperatures.

  A machine room 107 is formed in the back region of the lowermost storage room 106 of the heat insulation box 101, and the high pressure side components of the refrigeration cycle such as the compressor 108 and a dryer (not shown) for removing moisture are accommodated. .

  In FIG. 2, a cooling chamber 109 for generating cold air is provided on the back of the storage chamber 106, and a cooling air conveyance path to each chamber having heat insulating properties is provided between the storage chamber 106 and the storage chamber 106 for heat insulation. A configured cooling chamber partition wall 110 is configured. In the cooling chamber 109, an evaporator 111 having a film (for example, a super water-repellent film having a water contact angle of 160 degrees or more) that makes it easy to drop defrosted water generated on the surface is vertically disposed. In the upper space of the evaporator 111, a blower fan 112 that blows cool air cooled by the evaporator 111 to the storage chambers 104, 105, and 106 by a forced convection method is disposed. 111 is provided with a defrost heater 113 for defrosting the frost adhering to the surface, and further, a drain pan 114 for receiving the defrost water and draining it outside the storage is formed in the through passage 115 at the lower part thereof. An evaporating dish 116 is configured outside the box.

  In the cooling chamber partition wall 110, a cool air discharge port 124 for supplying the cool air generated by the evaporator 111 to the storage chamber 106 by the blower fan 112 and a cool air circulating in the storage chamber 106 are returned to the evaporator 111. The cold air inlet 125 is provided.

  In addition, a storage case for storing foods is arranged in the storage chamber 106 while being held and pulled out by a drawer mechanism. In the present embodiment, three storage cases are arranged in the storage chamber 106. Specifically, an upper storage case 126, a middle storage case 127, and a lower storage case 128 are arranged.

FIG. 3 shows a fin tube type evaporator 111 that is generally widely used in refrigerators, and includes a plurality of fins 151 and a plurality of heat transfer tubes 152 (A). A plurality of fins 151 are laminated at a predetermined interval, and a heat transfer tube 152 is provided so as to penetrate through holes provided in each fin (B). A plurality of grooves 153 are provided on the surface of the fin 151 linearly in the direction of gravity over the entire surface from the upper end to the lower end. Specifically, in this embodiment, the groove pitch is 0.6 mm, the groove depth is 0.2 mm, and the cross-sectional shape is substantially triangular (C).

  About the refrigerator comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, the flow of cool air in the storage chamber 106 will be described. The cool air cooled by the evaporator 111 is forcibly blown out from the cool air discharge port 124 into the storage chamber 106 by the blower fan 112 that rotates as the motor rotates. At this time, the cool air is blown and cooled by the blower fan 112 so as to pass through the surface of the evaporator 111 in a direction opposite to gravity. The cold air blown out cools the foods stored in the storage cases 126, 127, and 128. As shown by the arrows, the cold air that has cooled the food is sucked from the cold air inlet 125 through the gap between the storage case 128 and the inner wall of the heat insulating door, and returns to the evaporator 111 to form a circulation air passage configuration. Yes.

  When the heat insulating door 119 of the refrigerator 100 is opened to store food or the like, hot and humid air around the refrigerator 100 flows into the storage chamber 106. And after closing the heat insulation door 119, this inflow air circulates in the storage chamber 106, but when passing through the fin 151 surface of the evaporator 111, the water vapor in the inflow air condenses on the surface of the fin 151 and adheres to it. To do. Thereafter, adjacent condensed waters grow together, and the condensed water freezes through a supercooled state, and frost grows in a needle shape with the frozen part as a nucleus, forming a frost layer. This is a so-called frost phenomenon. As frost forms on the evaporator surface, the air flow resistance increases, the air volume decreases, the cooling capacity decreases, and the prescribed cooling performance cannot be maintained.

  Therefore, in order to remove the frost layer generated on the surface of the fin 151, the compressor 108 and the blower fan 112 are stopped, and at the same time, the defrost heater 113 provided at the lower part of the evaporator 111 is energized, and the surface of the defrost heater 113 is The frost layer is melted by high-temperature natural convection and radiant heat generated from The melted defrost water is in a super-water-repellent state with a contact angle of 160 degrees or more, and the contact area with the surface of the fin 151 is remarkably reduced. Therefore, the defrost water easily falls on the surface of the fin 151 and is linearly aligned in the direction of gravity. It can be easily dropped from the surface of the fin 151 by its own weight through the provided groove 153 (induced) and drained.

  In this way, by increasing the drainage performance of the defrost water on the surface of the fin 151, the defrost water itself becomes ventilation resistance when the cooling operation is resumed, or the remaining defrost water is used as a starting point for early frosting. It can lead to shortening of defrosting time by being able to prevent generating, and power saving of a refrigerator can be aimed at.

  Moreover, even if the direction in which the groove | channel 153 of the fin 151 is provided does not completely coincide with the gravity direction, the drainage performance of the defrost water can be enhanced if it has a gravity direction component.

  Further, even if the film on the surface of the evaporator 111 is somewhat deteriorated due to aging or the like, the effect of draining defrosted water can be stably obtained by providing the groove 153 having the gravity direction component.

  Further, the groove 153 on the surface of the fin 151 can be formed very inexpensively and easily by providing by pressing.

Furthermore, by providing the groove 153, the area (heat transfer area) in contact with air can be increased in the same fin outer dimensions, and the cooling capacity (heat exchange amount) during the cooling operation can be improved.

  As described above, in the present embodiment, the evaporator 111 that is installed in the storage chamber 106 and has a coating that makes it easy to drop the defrosted water generated on the surface from the surface, and cooling by the evaporator 111. In the refrigerator 100 provided with the blower fan 112 that blows the cool air into the storage chamber 106, a plurality of rows of grooves 153 are linearly provided on the fin 151 surface of the evaporator 111 in a direction having a gravity direction component. This improves the drainage performance of the defrost water generated on the surface of the fin 151 of the evaporator 111, and even when the film deteriorates due to aging, etc., the defrost water travels through the groove 153 so that the drainage can be stably drained. Defrosting can be performed by preventing the defrosted water itself from becoming a draft resistance when resuming the cooling operation, and by preventing the remaining defrosted water from starting and generating frost early. It leads to shortening between, it is possible to provide a refrigerator which is power saving.

  Note that the dimensions and cross-sectional shape of the groove 153 shown in this embodiment are merely examples, and the present invention is not limited to these dimensions and cross-sectional shapes.

(Embodiment 2)
FIG. 4 is a longitudinal sectional view of the refrigerator in the second embodiment of the present invention. FIG. 5 is a longitudinal cross-sectional view of the basic structure of the main part storage chamber of the refrigerator according to Embodiment 2 of the present invention. FIG. 6 is an enlarged view of the evaporator of the refrigerator in the second embodiment of the present invention. Note that the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In FIG. 5, a cooling chamber 129 for generating cool air is provided on the back surface of the storage chamber 106, and in the meantime, a cooling air conveyance air passage to each chamber having heat insulation properties and a heat insulating partition from the storage chamber 106 are provided. A configured cooling chamber partition wall 130 is configured. In the cooling chamber 129, an evaporator 131 having a film (for example, a super water-repellent film having a water contact angle of 160 degrees or more) that makes it easy to drop defrosted water generated on the surface is vertically disposed. In the lower space of the evaporator 131, a blower fan 132 for blowing cool air cooled by the evaporator 131 to the storage chambers 104, 105, 106 by a forced convection method is disposed. A defrost heater 113 for defrosting the frost adhering to the surface of the evaporator 131 is provided, and a drain pan 114 for receiving defrost water and draining it out of the warehouse is formed in the through passage 115 at the lower part thereof. An evaporating dish 116 is formed outside the downstream chamber.

  In the cooling chamber partition wall 130, a cool air discharge port 124 for supplying the cool air generated by the evaporator 131 to the storage chamber 106 by the blower fan 132 and a cool air circulating in the storage chamber 106 are returned to the evaporator 131. The cold air inlet 125 is provided.

  In addition, a storage case for storing foods is arranged in the storage chamber 106 while being held and pulled out by a drawer mechanism. In the present embodiment, three storage cases are arranged in the storage chamber 106. Specifically, an upper storage case 126, a middle storage case 127, and a lower storage case 128 are arranged.

  FIG. 6 shows a fin tube type evaporator 131 that is generally widely used in refrigerators, and includes a plurality of fins 161 and a plurality of heat transfer tubes 162 (A). A plurality of fins 161 are stacked at a predetermined interval, and a heat transfer tube 162 is provided so as to penetrate through holes provided in each fin. On the surface of the fin 161, a plurality of grooves 163 are linearly provided in the direction of gravity over the entire surface from the upper end to the lower end (B). Specifically, in this embodiment, the groove pitch is 0.6 mm, the groove depth is 0.2 mm, and the cross-sectional shape is substantially triangular (C).

  About the refrigerator comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  The flow of cool air in the storage chamber 106 will be described. The cool air cooled by the evaporator 131 is forcibly blown out from the cool air discharge port 124 into the storage chamber 106 by the blower fan 132 that rotates as the motor rotates. At this time, the cool air is blown and cooled by the blower fan 132 so as to pass through the surface of the evaporator 131 in the direction of gravity. The cold air blown out cools the foods stored in the storage cases 126, 127, and 128. As shown by the arrow, the cold air that has cooled the food is sucked from the cold air inlet 125 through the gap between the storage case 126 and the inner wall of the heat insulating door, and returns to the evaporator 131. Yes.

  When the heat insulating door 119 of the refrigerator 100 is opened to store food or the like, hot and humid air around the refrigerator 100 flows into the storage chamber 106. And after closing the heat insulation door 119, this inflow air circulates in the storage chamber 106, but when passing through the fin 161 surface of the evaporator 131, the water vapor in the inflow air condenses on the surface of the fin 161 and adheres. To do. Thereafter, adjacent condensed waters grow together, and the condensed water freezes through a supercooled state, and frost grows in a needle shape with the frozen part as a nucleus, forming a frost layer. This is a so-called frost phenomenon. As frost forms on the surface of the evaporator 131, the air flow resistance increases, the air volume decreases, the cooling capacity decreases, and the prescribed cooling performance cannot be maintained.

  Therefore, in order to remove the frost layer generated on the surface of the fin 161, the compressor 108 and the blower fan 132 are stopped, and at the same time, the defrost heater 113 provided at the lower part of the evaporator 131 is energized, and the surface of the defrost heater 113 is The frost layer is melted by high-temperature natural convection and radiant heat generated from The melted defrost water is in a super-water-repellent state with a contact angle of 160 degrees or more, and the contact area with the fin 161 surface is remarkably reduced. Therefore, the defrost water easily falls on the fin 161 surface, and a plurality of lines linearly in the direction of gravity. It can be easily dropped from the surface of the fin 161 by its own weight through the provided groove 163 (induced) and drained.

  In this way, by increasing the drainage performance of the defrost water on the surface of the fin 161, the defrost water itself becomes ventilation resistance when the cooling operation is resumed, or the remaining defrost water starts as a frost at an early stage. It can lead to shortening of defrosting time by being able to prevent generating, and power saving of a refrigerator can be aimed at.

  Moreover, even if the direction in which the groove 163 of the fin 161 is provided does not completely coincide with the direction of gravity, the defrosting water drainage performance can be enhanced if it has a gravity direction component.

  Moreover, even if the film on the surface of the evaporator 131 is somewhat deteriorated due to aging or the like, the effect of draining defrosted water can be stably obtained by providing the groove 163 having a gravity direction component.

  Furthermore, even if the defrost water stays on the surface of the fin 161 for some reason, the defrost stayed by blowing in the same direction (direction having a gravity direction component) as the self-weight direction of the defrost water when the cooling operation is resumed. The water can be drained by the power of the air.

  Further, the groove 163 on the surface of the fin 161 can be formed very inexpensively and easily by providing it by press working.

  Furthermore, by providing the groove 163, it is possible to increase the area (heat transfer area) in contact with air in the same fin outer dimensions, and to improve the cooling capacity (heat exchange amount) during the cooling operation.

  As described above, in the present embodiment, the evaporator 131 which is installed in the storage chamber 106 and has a film that makes it easy to drop the defrost water generated on the surface from the surface, and the evaporator 131 cools it. In the refrigerator 100 provided with the blower fan 132 that blows the cool air into the storage chamber 106, a plurality of rows of grooves 163 are linearly provided in the direction having a gravity direction component on the fin 161 surface of the evaporator 131 As a result, the performance of draining defrost water generated on the fin 161 surface of the evaporator 131 is improved, and even when the film deteriorates due to aging, etc., the defrost water propagates through the groove 163 so that the drainage can be stably drained. Furthermore, the blower fan blows in a direction having a gravity direction component, so that even if defrost water stays on the surface of the fin 161 due to some factor, Since the defrosted water that has remained can be drained by the power of the blown air by blowing it in the same direction as the direction of the weight of the defrosted water when restarting the operation (the direction having the gravity direction component), the defrosted water itself during the cooling operation It is possible to provide a refrigerator that saves power and leads to a reduction in defrosting time by being able to prevent airflow resistance and preventing the occurrence of frost early due to the remaining defrost water as the starting point. it can.

  Note that the dimensions and the cross-sectional shape of the groove 163 shown in this embodiment are examples, and the present invention is not limited to these dimensions and cross-sectional shapes.

(Embodiment 3)
FIG. 7 is a longitudinal sectional view of the refrigerator in the third embodiment of the present invention. FIG. 8 is a longitudinal cross-sectional view of the basic structure of the main part storage chamber of the refrigerator according to Embodiment 3 of the present invention. FIG. 9 is an enlarged view of the evaporator of the refrigerator in the third embodiment of the present invention. The same parts as those in the first or second embodiment are denoted by the same reference numerals and detailed description thereof is omitted.

  In FIG. 8, a cooling chamber 139 for generating cool air is provided on the upper surface of the storage chamber 106, and a cooling air conveyance path to each chamber having heat insulation properties and an insulating compartment with the storage chamber 106 are provided between them. A configured cooling chamber partition wall 140 is configured. In the cooling chamber 139, an evaporator 141 having a film (for example, a super water-repellent film with a water contact angle of 160 degrees or more) that makes it easy to drop defrosted water generated on the surface is slightly inclined from the horizontal. (For example, inclined at 5 degrees toward the back side of the storage chamber 106), the cooler air cooled by the evaporator 111 by forced convection is stored in the back space of the evaporator 141 in the storage chambers 104, 105. , 106 is disposed. A defrosting heater 113 for defrosting frost adhering to the surface of the evaporator 111 is provided below the evaporator 111.

  In the cooling chamber partition wall 140, a cool air discharge port 124 for supplying the cool air generated by the evaporator 141 to the storage chamber 106 by the blower fan 142 and a cool air circulating in the storage chamber 106 are returned to the evaporator 111. The cold air inlet 125 is provided.

  In addition, a storage case for storing foods is arranged in the storage chamber 106 while being held and pulled out by a drawer mechanism. In the present embodiment, three storage cases are arranged in the storage chamber 106. Specifically, an upper storage case 126, a middle storage case 127, and a lower storage case 128 are arranged.

  FIG. 9 shows a fin tube type evaporator 141 that is generally widely used in refrigerators, and includes a plurality of fins 171 and a plurality of heat transfer tubes 172 (A). A plurality of fins 171 are stacked at a predetermined interval, and a heat transfer tube 172 is provided so as to penetrate through holes provided in each fin. The surface of the fin 171 is provided with a plurality of grooves 173 linearly in the direction of gravity over the entire surface from the upper end to the lower end (B). Specifically, in this embodiment, the groove pitch is 0.6 mm, the groove depth is 0.2 mm, and the cross-sectional shape is substantially triangular (C).

  About the refrigerator comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, the flow of cool air in the storage chamber 106 will be described. The cool air cooled by the evaporator 141 is forcibly blown out from the cool air discharge port 124 into the storage chamber 106 by the blower fan 142 that rotates as the motor rotates. At this time, the cool air is blown and cooled by the blower fan 142 so as to pass through the surface of the evaporator 141 in a direction having a gravity direction component. The cold air blown out cools the foods stored in the storage cases 126, 127, and 128. As shown by the arrows, the cold air that has cooled the food is sucked from the cold air inlet 125 through the gap between the storage case 126 and the inner wall of the heat insulating door, and returns to the evaporator 141. Yes.

  When the heat insulating door 119 of the refrigerator 100 is opened to store food or the like, hot and humid air around the refrigerator 100 flows into the storage chamber 106. And after closing the heat insulation door 119, this inflow air circulates in the storage chamber 106, but when passing through the fin 171 surface of the evaporator 141, the water vapor in the inflow air condenses on the surface of the fin 171 and adheres. To do. Thereafter, adjacent condensed waters grow together, and the condensed water freezes through a supercooled state, and frost grows in a needle shape with the frozen part as a nucleus, forming a frost layer. This is a so-called frost phenomenon. As frost forms on the evaporator surface, the air flow resistance increases, the air volume decreases, the cooling capacity decreases, and the prescribed cooling performance cannot be maintained.

  Therefore, in order to remove the frost layer generated on the surface of the fin 171, the compressor 108 and the blower fan 112 are stopped, and at the same time, the defrost heater 113 provided at the lower portion of the evaporator 141 is energized, and the surface of the defrost heater 113 is The frost layer is melted by high-temperature natural convection and radiant heat generated from The melted defrost water is in a super water-repellent state with a contact angle of 160 degrees or more, and the contact area with the surface of the fin 171 is remarkably reduced. Therefore, the defrosted water easily falls on the surface of the fin 171 and is linearly aligned in the direction of gravity. It can be easily dropped from the surface of the fin 171 by its own weight through the provided groove 173 (induced) and drained.

  In this way, by increasing the drainage performance of the defrost water on the surface of the fin 171, the defrost water itself becomes a draft resistance when the cooling operation is resumed, or the remaining defrost water starts as a frost at an early stage. It can lead to shortening of defrosting time by being able to prevent generating, and power saving of a refrigerator can be aimed at.

  Moreover, even if the direction in which the groove 173 of the fin 171 is provided does not completely coincide with the direction of gravity, the defrosting water draining performance can be enhanced if it has a gravity direction component.

  In addition, even if the film on the surface of the evaporator 111 is somewhat deteriorated due to aging or the like, the effect of draining defrost water can be stably obtained by providing the groove 173 having a gravity direction component.

  Furthermore, even if the defrost water stays on the surface of the fin 171 for some reason, the defrost stayed by blowing in the same direction (direction having a gravity direction component) as the self-weight direction of the defrost water when the cooling operation is resumed. The water can be drained by the power of the air.

  Further, the groove 173 on the surface of the fin 171 can be formed very inexpensively and easily by being provided by press working.

  Furthermore, by providing the groove 173, the area (heat transfer area) in contact with air can be increased in the same fin outer dimensions, and the cooling capacity (heat exchange amount) during the cooling operation can be improved.

  As described above, in the present embodiment, the evaporator 141 is installed in the storage chamber 106 and has a film that makes it easy to drop the defrost water generated on the surface from the surface, and the evaporator 141 cools it. In the refrigerator 100 provided with the blower fan 142 that blows the cool air into the storage chamber 106, a plurality of grooves 173 linearly provided in the direction having a gravity direction component on the surface of the fin 171 of the evaporator 141 As a result, the performance of draining defrosted water generated on the surface of the fins 171 of the evaporator 141 is improved, and even when the film is deteriorated due to aging, etc., the defrosted water travels through the groove 173 so that the drainage can be stably drained. Even if the defrost water stays on the surface of the fin 171 by some reason, the cooling fan can be cooled by blowing the fan in the direction having the gravity direction component. Since the defrosted water that has remained can be drained by the power of the blown air by blowing it in the same direction as the direction of the weight of the defrosted water when restarting the operation (the direction having the gravity direction component), the defrosted water itself during the cooling operation It is possible to provide a refrigerator that saves power and leads to a reduction in defrosting time by being able to prevent airflow resistance and preventing the occurrence of frost early due to the remaining defrost water as the starting point. it can.

  Note that the dimensions and the cross-sectional shape of the groove 173 shown in this embodiment are merely examples, and the present invention is not limited to these dimensions and cross-sectional shapes.

  As described above, the evaporator of the refrigerator according to the present invention can be applied to a household or commercial refrigerator, a vegetable storage, and a showcase.

DESCRIPTION OF SYMBOLS 100 Refrigerator 101 Heat insulation box 102 Outer box 103 Inner box 104, 105, 106 Storage chamber 109, 129, 139 Cooling chamber 110, 130, 140 Cooling chamber partition wall 111, 131, 141 Evaporator 112, 132, 142 Blower fan 113 Defrost heater 114 Drain pan 115 Through passage 116 Evaporating dish 117, 118, 119 Thermal insulation door 124 Cold air outlet 125 Cold air inlet 126, 127, 128 Storage cases 151, 161, 171 Fins 152, 162, 172 Heat transfer tubes 153, 163, 173 groove

Claims (6)

An evaporator that is installed in the storage chamber and has a film that makes it easy to drop defrosted water generated on the surface from the surface; and a blower fan that blows cool air cooled by the evaporator into the storage chamber; The said evaporator is equipped with the fin on the surface, The groove | channel was provided in the fin surface of the said evaporator, The refrigerator characterized by the above-mentioned. The refrigerator according to claim 1, wherein the groove is provided linearly in a direction having a gravity direction component. The refrigerator according to claim 1 or 2, wherein the grooves are provided in a plurality of rows. The refrigerator according to any one of claims 1 to 3, wherein the groove is provided by press working. The refrigerator according to any one of claims 1 to 4, wherein a super water-repellent film having a water contact angle of 160 degrees or more is provided on a surface of the evaporator. The refrigerator according to any one of claims 1 to 5, wherein the blower fan blows air in a direction having a gravity direction component.