JP2009127926A - Cooler with defrosting heater and article storage device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooler achieved in the space saving of the cooler and a defrosting heater, after reducing power consumption in defrosting. <P>SOLUTION: The cooler 1 disposed in a refrigerator body which is a heat insulating box forming a storage chamber includes cooling pipes 2 and a fin 4 wherein at least the cooling pipe 2 located at the lowermost stage has a naked pipe 2c where the fin 4 is not formed, and a defrosting heater 5 is fixed to the naked pipe 2c through a heat transfer plate 6 so that the thermal conduction of the cooling pipe 2 and pipe convection can be improved to efficiently perform defrosting. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cooler constituting a refrigeration cycle provided in an article storage device such as a refrigerator, and more particularly to a cooler with a defrost heater.

  In recent years, while energy saving in refrigerators is strongly demanded in the market, the power consumption of the defrosting heater is also being reviewed. In addition, the refrigerant in the refrigeration cycle has a low global warming potential because there is no destruction of the ozone layer from hydrofluorocarbons (HFCs) that have been used in the past in order to deal with ozone layer destruction and global warming problems caused by chlorofluorocarbons. Switching to a hydrocarbon-based refrigerant (hereinafter referred to as “HC refrigerant”) such as isobutane (R600a) is progressing.

  Since this HC refrigerant, such as isobutane, is a flammable refrigerant, it may ignite with a spark or the like and develop into a fire if a refrigerant leak occurs. Therefore, in the refrigerator using HC refrigerant, various explosion-proof measures are considered because it may ignite and ignite due to contact of electrical parts, relays, etc., heat generated by the defrost heater, and the like.

  For the purpose of solving such problems related to energy saving and safety of conventional defrost heaters, refrigerators that have improved the configurations of the cooler and the defrost heater have been proposed (for example, patents). Reference 1).

  In addition, conventional refrigerators generally have a machine room in the rear rear region of the storage room disposed at the lowermost part, and a compressor for a refrigeration cycle is accommodated in the machine room. With such a configuration, the storage space of the lowermost storage chamber is reduced due to the formation of the machine room, the storage volume is reduced, and the space shape of the storage space is also a complicated shape excluding the protruding part of the machine room. As a result, the storage was not good.

  On the other hand, a refrigerator is proposed in which a recessed portion that is recessed so that the back of the uppermost storage chamber of the heat insulating box is lowered and a component such as a compressor that constitutes a refrigeration cycle is housed in the recessed portion. In the refrigerator having such a configuration, the storage space for the cooler and the defrosting heater can be thin in the depth direction and low in the height direction, so that a large storage space can be secured. (For example, refer to Patent Document 2).

  FIG. 7 shows an enlarged cross-sectional view around the cooler of the refrigerator described in Patent Document 1.

  As shown in FIG. 7, the cooler 60 is inserted into a long cooling pipe 61 by stacking and inserting fins 62 made of thin thin pieces of aluminum at a predetermined pitch, and then the cooling pipe 61 is bent in a meandering manner. It is formed in a rectangular parallelepiped shape having a predetermined width corresponding to the rear width of the room, a depth dimension of the fin, and a predetermined height dimension by bending.

  The fins 62 are disposed only in the straight pipe portion of the cooling pipe 61, and the bent portion located at the end of the cooling pipe 61 has a relatively thick, strip-shaped rigid body extending up and down the cooling pipe 61. The end plate 63 is arranged, and a fitting hole (not shown) drilled in the end plate 63 is made to coincide with the bent portion, and the cooling pipe 61 and the fin 62 are sandwiched and fixed from both sides to cool the cooler 60. Is forming.

  The end plate 63 extends further downward from the lowermost edge of the fin 62, and a defrost heater 64 that defrosts the cooler 60 is installed between both end plates of the extended portion. The defrost heater 64 is fitted into a notch 65 provided on the opposite side of the end plate 63 and is constructed between the both end plates 63.

  A heater cover 66 is disposed between the defrost heater 64 and the lowermost end portion of the fin 62 in the cooler 60. The heater cover 66 protects the upper part of the defrosting heater 64 and, along with the defrosting operation, the frost attached to the cooler 60 is melted to form water droplets on the surface of the glass tube 67 constituting the defrosting heater 64. It is for dripping and not generating an evaporating sound, and similarly to the defrost heater 64, it is fitted and held from the side in a slit-like locking groove (not shown) formed in the end plate 63. .

  The heater cover 66 may be fixed by being sandwiched between the end plates 63 together with the meandering cooling pipe 61 and the fins 62 when the cooler 60 is assembled, and the sectional shape of the heater cover 66 drops from the fins 62. Receiving the defrost water, it is formed in a mountain shape so that it can easily flow to the lower drainage basin 68, and a plurality of slits 69 that open in the width direction of the interior are formed in the slope near the top of the center. It is installed.

  In the above configuration, when the refrigerator (cooler 60) enters the defrosting operation, the heater cover 66 is first heated by the heating action of the warm air (updraft) and radiant heat generated by the defrost heater 64 that has generated heat, and further the slit 69 The cooler 60 is heated through.

  Further, defrosting is also promoted by heating the end plate 63 by heat conduction from the heater cover 66 heated by the warm air.

  FIG. 8 shows a longitudinal sectional view of the refrigerator described in Patent Document 2. As shown in FIG.

  As shown in FIG. 8, the inside of the heat insulation box 71 is formed with a refrigerator compartment 72, a freezer compartment 73, and a vegetable compartment 74 in order from the top. A refrigerator door 75 is provided at the front opening of the refrigerator compartment 72.

  In addition, in the freezer compartment 73 and the vegetable compartment 74 located at the lower part from the center of the heat insulating box 71, a drawer type freezer compartment door 76 and a vegetable compartment door 77 that can be easily taken out in consideration of storability and convenience. Is provided.

  A plurality of storage shelves 78 are provided in the refrigerator compartment 72, and storage containers 79 a and 79 b each having an open top surface are attached to the freezer compartment 73 and the vegetable compartment 74. The storage containers 79a, 79b are supported so as to be movable in the front-rear direction via rollers (not shown) guided by rails (not shown) in the front-rear direction.

  The recess 80 provided in the heat insulation box 71 is a place where the top back portion extending over the outer box top surface 81 and the outer box back surface 82 is recessed so that the uppermost back portion of the refrigerator compartment 72 is lowered. The left and right sides of the recess 80 are closed by the left and right walls of the heat insulating box 71, and the upper side and the back side are open. The opening of the recess 80 is covered with a recess cover 85 including an upper plate 83 and a back plate 84 substantially perpendicular thereto. The recess cover 85 is detachably fixed to the heat insulating box 71 with screws or the like.

  The compressor 86 and the condenser 87, which are components of the refrigeration cycle, are disposed so as to be accommodated in the recess 80 together with the machine room fan 88, and are covered with a recess cover 85 including an upper plate 83 and a back plate 84. ing.

A cooler 89 and a defrost heater (not shown), which are components of the refrigeration cycle, are arranged in a limited space on the back surface of the freezer compartment 73.
JP 2004-190959 A JP 2001-99552 A

  However, the configuration of the cooler 60 described in Patent Document 1 is effective in reducing the surface temperature of the defrost heater 64 by heat conduction to the end plate 63, but the heat of the defrost heater 64 is heated by the heater cover. Since it is used for the heating of 66, the heating time of the cooler 60 is required. As a result, the defrosting time is prolonged and the energy saving effect is not sufficient.

  Further, even when the cooler 60 described in Patent Document 1 is mounted on the refrigerator described in Patent Document 2, the distance between the cooler 60 and the defrost heater 64 is reduced in the structure of FIG. However, it has a problem that it is not suitable for being stored in a limited height space.

  The present invention solves the above-mentioned conventional problems, and is arranged in a limited space by suppressing the overall height of a structure (cooler with a defrost heater) composed of a cooler and a defrost heater. In addition, the heat of the defrost heater is transmitted to the cooling pipe, and the cooling pipe is actively heated to improve the defrosting efficiency by the thermosiphon effect of the refrigerant in the cooling pipe, and consumption during defrosting It aims at providing the cooler with a defrost heater which can reduce electric power significantly.

  The purpose of the invention is to suppress the surface temperature of the defrosting heater, to enable application to an article storage device including a refrigeration cycle device in which a flammable refrigerant is sealed, and to ensure the safety of the article storage device. is there.

  In order to solve the above-described conventional problems, the present invention provides a cooling pipe at the lowest stage of a cooler having a cooling pipe through which a plurality of fins penetrates as a bare pipe part through which the fins do not penetrate, A defrost heater for heating at least the bare pipe portion of the cooler is disposed below, a heat transfer plate heated by the defrost heater is disposed above the defrost heater, and the heat transfer plate is further disposed. A cover portion that covers the defrost heater from above, a close contact portion that is formed continuously with the cover portion and that is in close contact with the bare tube portion of the cooling tube, and a heat receiving portion that is in close contact with the heat generating surface of the defrost heater It consists of more.

  Thereby, the heat on the surface of the defrost heater is transferred from the heat receiving portion to the cooling pipe via the heat transfer plate, so that the heat of the defrosting heater can be efficiently transferred to the cooling pipe.

  Therefore, the cooling pipe can be positively heated, and the thermosiphon effect of the refrigerant in the cooling pipe can be improved by utilizing the heat conduction of the cooling pipe. As a result, the defrosting efficiency of the cooler is improved, and the power consumption during defrosting can be greatly reduced.

  Further, since the heat of the defrost heater is conducted to the cooling pipe via the heat transfer plate, an increase in the surface temperature is suppressed. As a result, even in the case of an article storage device including a refrigeration cycle device in which a flammable refrigerant is sealed, by adopting the above-described cooler with a defrost heater as a cooler constituting the refrigeration cycle device, a defrost heater The surface temperature of the flammable refrigerant can be kept below the ignition temperature of the combustible refrigerant, and even if the defrost heater generates heat in the situation where the flammable refrigerant leaks into the article storage device, the leaked refrigerant will not ignite, Safety can be maintained.

  Furthermore, by arranging the defrost heater in the vicinity of the cooling pipe located at the lowermost stage, the height dimension occupied by the cooler and the defrost heater is compressed, and the space occupied by the cooler and the defrost heater is reduced. be able to. As a result, the article storage volume in the article storage device can be secured more widely, and the storage capacity and usability of the articles can be improved.

  In the cooler with a defrost heater of the present invention, the heat of the defrost heater is conducted from the heat receiving portion to the cooling pipe via the heat transfer plate, so that the thermosiphon effect is obtained by the refrigerant convection caused by the heating of the refrigerant pipe. Therefore, the defrosting efficiency of the cooler can be improved, and the power consumption during defrosting can be greatly reduced.

  In addition, when a flammable refrigerant is used, the cooling pipe is heated via the close contact portion of the heat transfer plate, so that the surface temperature of the defrost heater is flammable without reducing the heat capacity of the heater wire. The temperature can be kept below the ignition temperature of the refrigerant, and safety can be maintained.

  Furthermore, by arranging the defrost heater in the vicinity of the cooling pipe located at the lowermost stage, the height dimension occupied by the cooler and the defrost heater is compressed, and the space occupied by the cooler and the defrost heater is reduced. be able to. As a result, it is possible to secure a wider article storage volume in the article storage device, and to improve article storage and usability.

  In the cooler having a cooling pipe through which a plurality of fins penetrates, the lowermost cooling pipe is a bare pipe part through which the fins do not penetrate, and at least below the cooler, A defrost heater for heating the bare pipe portion of the cooler is disposed, a heat transfer plate heated by the defrost heater is disposed above the defrost heater, and the heat transfer plate is further disposed on the defrost. A cover part that covers the heater from above, a contact part that is formed continuously with the cover part and that is in close contact with the bare pipe part of the cooling pipe, and a heat receiving part that is in close contact with the heating surface of the defrost heater It is.

  By adopting such a configuration, a configuration is obtained in which the heat of the defrost heater is transmitted from the heat receiving portion to the cooling pipe via the heat transfer plate, and the cooling pipe is positively heated by the defrost heater. As a result, the thermosiphon effect of the refrigerant in the cooling pipe can be improved. As a result, defrosting efficiency can be improved, and power consumption during defrosting can be reduced.

  Moreover, by arranging the defrost heater in the vicinity of the cooling pipe (bare pipe portion) located at the lowest stage, the height dimension occupied by the cooler and the defrost heater can be compressed, and the cooler and the defrost heater The space occupied by can be reduced.

  The invention according to claim 2 is the invention according to claim 1, wherein the contact portion is a close contact portion that is bent so as to be in close contact with the outer periphery of the bare tube portion.

  As a result, heat conduction between the heat transfer plate and the cooling pipe can be satisfactorily performed, the thermosiphon effect in the cooling pipe can be effectively acted on, and since it is in close contact with the cooling pipe by bending, this The heat transfer plate can be fixed to the cooler by the close contact configuration, and the number of parts can be reduced and the configuration can be simplified.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the heat receiving portion is formed continuously with the close contact portion.

  By setting it as this structure, the heat | fever of a defrost heater can be transmitted to a cooling pipe in a state with little loss, and the improvement of a defrost efficiency can be anticipated.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the close contact portion is provided continuously on a longitudinal side edge of the heat transfer plate.

  By adopting such a configuration, the heat transfer area to the cooling pipe by the heat transfer plate can be increased, the thermosiphon effect in the cooling pipe can be enhanced, and further improvement in defrosting efficiency can be expected. As the partial area increases, the fixing area of the heat transfer plate to the cooling pipe can also be increased, and the heat transfer plate can be more firmly fixed to the cooling pipe.

  The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the heat receiving portion is provided with a fixing function for fixing the defrost heater to a heat transfer plate.

  By setting it as this structure, the distance of the said cooling pipe and a defrost heater can be stabilized, and the stable defrost effect | action can be obtained resulting from this. Moreover, since another component for fixing the defrosting heater can be made unnecessary or simplified, the added value of the heat transfer plate can be increased and the number of components can be reduced.

  The invention according to claim 6 is the invention according to any one of claims 1 to 5, wherein the cover portion of the heat transfer plate is provided with a through portion through which air on the defrost heater side escapes upward. Is.

  By adopting such a configuration, the defrosting of the cooler is caused by the escape from the air penetration portion located on the defrosting heater side in addition to the thermosiphon effect of the cooling pipe by the heat transfer through the heat transfer plate. The frost adhering to the cooling pipe can be heated also by the rising airflow, and further improvement in defrosting efficiency can be expected.

  The invention according to claim 7 comprises a main body comprising a heat insulating box having an opening on one side, a door for opening and closing the opening, and an article storage comprising a refrigeration cycle apparatus in which a combustible refrigerant is sealed in the main body. It is an apparatus, Comprising: It is an article | item storage apparatus which used the cooler which comprises the said refrigerating cycle apparatus as the cooler with a defrost heater as described in any one of Claims 1-6.

  This makes it possible to take advantage of the defrosting characteristics of the cooler with a defrosting heater, to have high defrosting efficiency, and to greatly reduce power consumption during defrosting.

  In addition, the heat of the defrost heater is transmitted to the cooling pipe via the heat receiving part and the close contact part of the heat transfer plate, and the cooling pipe is heated, so the surface temperature of the defrost heater is reduced and the heat capacity of the defrost heater is reduced. Without being made, it can be suppressed below the ignition temperature of the flammable refrigerant, and safety can be maintained.

  Furthermore, since the height dimension occupied by the cooler and the defrost heater can be compressed and the space occupied by the cooler and the defrost heater can be reduced, the article storage capacity in the article storage device can be secured more widely. Further, the storage property and usability of the article can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a front view of a cooler with a defrosting heater according to Embodiment 1 of the present invention. FIG. 2 is a side view of the cooler with a defrosting heater in the first embodiment. FIG. 3 is an enlarged cross-sectional view of the periphery of the defrost heater of the cooler with the defrost heater in the first embodiment. FIG. 4 is a cross-sectional perspective view of a main part showing an attachment structure of a defrost heater of the cooler with a defrost heater in the first embodiment.

  1 to 4, the cooler 1 is mainly composed of a cooling pipe 2, an accumulator 3, and fins 4, and each of the cooling pipe 2, the accumulator 3, and the fins 4 is made of an aluminum material.

  The cooling pipe 2 is formed by bending an aluminum pipe so as to meander in a zigzag shape, and penetrates the plurality of fins 4. Therefore, the refrigerant that has flowed in from the inlet pipe 2a positioned at the top flows out from the outlet pipe 2b after performing heat exchange accompanied by heat exchange promoting action of the fins 4 while sequentially passing through the meandering flow path.

  Here, the bare pipe portion 2 c located at the lowermost part of the cooler 1 is a portion that does not include the fins 4, and is located at a portion that includes a substantially middle point with respect to the entire length of the cooling tube 2. . In other words, the bare pipe portion 2c is a substantially intermediate section of the refrigerant flow, and a pair of pipes composed of a forward path and a return path form a folded pipe line, and the refrigerant that has passed through the bare pipe section 2c The flow reverses and rises.

  The accumulator 3 is provided in the outlet pipe 2b of the cooler 1 on the downstream side in the refrigerant flow direction, and is disposed on the cooler 1.

  Further, as described above, the fins 4 penetrate the cooling pipe 2 and are continuous in the vertical direction. The fin 4 and the cooling pipe 2 are fixed in close contact with each other by expanding the cooling pipe 2 mechanically or hydraulically in a state where the fin 4 is penetrating.

  Here, the bare tube portion 2c is a concept of a predetermined section (a continuous tube surface portion) in which no fins are provided in the refrigerant tube 2 having a plurality of fins (fin groups).

  Further, a defrost heater 5 is disposed below the cooler 1. The defrost heater 5 includes a heater wire 5a in which a metal resistor is formed in a coil shape, an inner glass tube 5b that covers the heater wire 5a, an outer glass tube 5c that covers the inner glass tube 5b, both glass tubes 5b, It is a double glass tube heater provided with a cap 5d that covers both end openings of 5c.

  A heat transfer plate 6 made of the same material as the cooling pipe 2 is fixed to the bare pipe portion 2 c of the cooling pipe 2.

  The heat transfer plate 6 is positioned above the defrost heater 5 and has a long cover portion 6a that covers the defrost heater 5 and a close contact portion 6b that is provided on one side in the longitudinal direction of the cover portion 6a. A heat receiving portion 6c that is continuous with the portion 6b and is in close contact with substantially the entire circumferential surface (about 3/4) of the defrosting heater 5, and a contact portion 6d that is continuous with the heat receiving portion 6c and is located away from the close contact portion 6b. These are structures, and these are integrally formed by a processing method such as pressing and bending, or extrusion molding of a single aluminum plate. The heat transfer plate 6 can be formed from a plurality of parts as required.

  The cover part 6a prevents the defrost water at the time of defrosting from falling on the defrost heater 5, and it inclines in one direction, but it can also be formed in the mountain shape which the center rises. Moreover, the hydrophilic process can also be given to the surface as needed. And by the above-mentioned inclination, space is formed between the contact | adherence part 6d, and let the space be the penetration part 6e.

  Further, the heat receiving portion 6b is bent so as to match the outer diameter of the outer glass tube 5c of the defrosting heater 5, and by this bending process, a surface contact that is in close contact with the outer glass tube 5c is formed. While taking heat of the frost heater 5 efficiently, consideration is given to fixing the defrost heater 5 to the heat transfer plate 6.

  Further, the close contact portions 6b and 6d are bent so as to match the outer diameter of the bare tube portion 2c, and surface contact in close contact with the bare tube portion 2c is formed. Further, since the close contact portions 6b and 6d are bent in a direction in which the bare tube portion 2c is held, for example, the space H (FIG. 3) between the close contact portions 6b and 6d is set to a pair of bare portions. By setting it equal to the interval between the tube portions 2c, after the cooler 1 is completed, the interval is slightly narrowed by using the flexible deformation force of the bare tube portion 2c, and the bare tube portion 2c is contacted by the contact portions 6b and 6d. And a close contact relationship is formed by utilizing the restoring action (spring back action) of the bare tube portion 2c, and the close contact between the close contact portions 6b and 6d and the bare tube portion 2c is further strengthened using a jig or the like. The mounting of the heat transfer plate 6 can be completed. In addition, the heat transfer plate 6 can be reliably fixed to the bare tube portion 2c simultaneously with the formation of this close relationship.

  Moreover, since the close contact portion 6b is formed continuously in the longitudinal direction of the cover portion 6a, and the close contact portion 6d is formed continuously in the longitudinal direction of the heat receiving portion 6c in the same manner as the close contact portion 6b, the bare tube A wide contact area with the portion 2c can be secured, and a sufficient heat transfer area can be formed.

  The heat transfer plate 6 is fixedly fixed to the bare tube portion 2c using the above-described flexible deformation action of the bare tube portion 2c. In addition, in the assembly process of the cooler 1, the heat transfer plate 6 After inserting the contact portions 6c and 6d into the bare tube portion 2c, the cooling tube 2 is mechanically expanded or hydraulically expanded, and the outer diameter of the bare tube portion 2c is set to be equal to or larger than the inner diameter of the contact portions 6c and 6d of the heat transfer plate 6. It is also possible to do this.

  In such a case, the heat transfer plate 6 can be tightly fixed to the bare pipe portion 2c and the cooling pipe 2 and the fin 4 can be fixed simultaneously, and the working efficiency is improved.

  Further, there is a method in which the heat transfer plate 6 is fixed to the cooler 1 by attaching the contact portions 6b and 6d to the bare tube portion 2c and then brazing the contact portions 6b and 6d with aluminum.

  Further, as shown in FIG. 1, the thermistor 7 constituting the temperature detecting means for controlling the defrosting is closely fixed to the accumulator 3.

  The cooler 1 configured as described above is mounted on a refrigeration device or the like and performs a cooling operation. During the defrosting operation, the cooling operation is stopped and the defrosting heater 5 is energized. As a result, the heat receiving portion 6c of the heat transfer plate 6 is immediately heated and the frost adhering to the heat receiving portion 6c is melted, and at the same time, heat is transferred to the cooling pipe 2 side through the close contact portions 6b and 6d. The bare tube portion 2c of the tube 2 is quickly heated.

  As a result, the refrigerant staying inside the bare tube portion 2c receives heat from the heating of the bare tube portion 2c, the liquid component becomes high temperature and gasifies, and heat transfer from below to above occurs over time. Done.

  Therefore, in the cooling pipe 2 of the cooler 1, the temperature gradually rises from below to above due to the above-described heat transfer, so-called thermosiphon phenomenon, and the frost attached to the fins 4 and the cooling pipe 2 starts to melt. .

  Thereby, the frost becomes water droplets or falls in a lump on the cover 6a of the heat transfer plate 6 and falls downward due to the inclination of the cover 6a.

  As described above, the cooler 1 according to the first embodiment is configured to heat the cooling pipe 2 that is difficult to receive the heat of the defrost heater 5 directly using the thermosiphon phenomenon, and thus it is particularly difficult to melt frost. The heat of the defrost heater 5 can be efficiently transferred to the upper part of the cooler 1 and the defrost time can be shortened.

  Further, since the cover 6a of the heat transfer plate 6 is provided with the through-hole 6e, the hot air escapes upward from the through-hole 6e without being trapped in the cover 6a and is cooled by the rising airflow. The frost attached to the tube 2 can be heated. As a result, the defrosting action is promoted, and further improvement in defrosting efficiency can be expected.

  Further, the heat transfer plate 6 is formed of a heat conductive good conductor (aluminum material), and in addition, since a part of the defrost heater 5 is exposed from the heat receiving portion 6c, in addition to the heat conducting action, to the covering portion 6a. The heat transfer plate 6 can be heated by radiant heating. Therefore, the defrosting action can be promoted also by this radiant heating action, and the defrosting time can be further shortened and the power consumption during the defrosting can be reduced.

  Furthermore, since the close contact portions 6b and 6d in the heat transfer plate 6 are continuously formed in the longitudinal direction of the cover portion 6a and the heat receiving portion 6c, a heat transfer area to the bare tube portion 2c can be secured, and the bare portion can be efficiently removed. Heat can be transferred to the tube portion 2c, contributing to the improvement of defrosting efficiency, and the fixing area of the heat transfer plate 6 to the bare tube portion 2c is increased, so that the heat transfer plate 6 is more reliably attached to the cooling tube 2. Can be fixed.

  Further, since the close contact portions 6b, 6d and the bare tube portion 2c can be brought into close contact with the bare tube portion 2c at the same time as the heat transfer plate 6 is attached, the assembly workability is good and the increase in the number of parts is suppressed and the structure is simple. Can be achieved.

  Further, the cooler 1 is configured such that the heat transfer plate 6 is fixed to the bare pipe portion 2 c of the cooling pipe 2 constituting the cooler 1 and the defrost heater 5 is attached to the heat transfer plate 6. The distance between the defrosting heater 5 and the cooling pipe 2 can be stabilized, the added value of the heat transfer plate 6 is increased, the quality of the cooler with the defrosting heater is maintained, and the reliability of the defrosting operation is improved. Can be expected.

  In addition, the height dimension occupied by the cooler 1 and the defrost heater 5 can be set short, and as a result, the cooler with the defrost heater can be made compact and advantageous in mounting on a refrigeration apparatus or the like. It will be.

  The material of the heat transfer plate 6 is the same aluminum material as that of the cooling pipe 2 from the viewpoint of corrosion such as thermal conductivity and electric corrosion, but it is desirable to use a pure aluminum system for these. Other aluminum alloys may be used. Furthermore, when the surface of the bare tube portion 2c is coated by coating the cooler 1 or in an environment where the influence of electrolytic corrosion is small, metals other than aluminum and other heat conductive materials are used. May be.

(Embodiment 2)
Next, a second embodiment will be described. In addition, about the same component as Embodiment 1, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  FIG. 5 is a side view in which a part of the refrigerator on which the cooler with a defrost heater according to the first embodiment is mounted is cut away. FIG. 6 is an enlarged view of a cooler unit in the refrigerator.

  5 and 6, the refrigerator is formed of a heat insulating box, and has a main body 11 provided with a plurality of storage chambers (not shown) therein, and doors 12a and 12b provided corresponding to the respective storage chambers. , 12c, 12d, and a cooling device for cooling the storage chamber.

  The cooling device includes a compressor 13, a condenser, a decompression device (all not shown), and a refrigeration cycle in which the cooler 1 is connected in an annular shape. The refrigerant is a combustible refrigerant (for example, isobutane). It is used.

  The cooler 1 has the configuration shown in the first embodiment, and is disposed in a cooling chamber 14 formed at the lower back of the main body 11.

  Further, the main body 11 is provided with ducts 15 and 16 which are adjacent to the cooling chamber 14 and communicate with the respective storage chambers. The cool air cooled by the cooler 1 by the blower 17 provided in the cooling chamber 14 is provided. As indicated by the arrows in FIG. 6, each storage chamber is circulated. The cold air circulation configuration may be a well-known configuration and will not be described in detail.

  Furthermore, the compressor 13 is arrange | positioned at the upper rear part of the main body 11, and, thereby, the main body 11 becomes the structure which ensured the storage effective volume of the storage chamber.

  About the refrigerator comprised as mentioned above, the operation | movement is demonstrated below. Details of the cooler 1 will be described with reference to FIGS. 1 to 4.

  The compressor 13 is operated, and the entire cooler 1 is cooled as the cooling operation proceeds.

  Here, the heat transfer plate 6 is cooled in the same manner as the cooling pipe 2 and the fins 4 because the close contact portions 6 b and 6 d are closely fixed to the bare tube portion 2 c. At this time, the heat transfer plate 6 increases the outside area of the heat transfer as a part of the cooler 1, and thus acts to increase the cooling capacity of the cooler 1.

  When the cooling operation is further continued, the surfaces of the cooling pipe 2, the bare pipe portion 2c, and the fin 4 of the cooler 1 are frosted.

  Here, as is well known, when the cooling operation is switched to the defrosting operation using the accumulated operation time of the compressor 13 as a guide, a predetermined voltage is applied to the defrosting heater 5 (heater wire 5a). By applying a predetermined voltage to the defrost heater 5, the surface temperatures of the inner glass tube 5 b and the outer glass tube 5 c of the defrost heater 5 are increased, and the heat receiving portion 6 c of the heat transfer plate 6 is immediately heated.

  As a result, the bare tube portion 2c is heated by heat transfer from the heat receiving portion 6c through the close contact portions 6b and 6d.

  In particular, as described in the first embodiment, the cooler 1 has a short relative distance between the bare tube portion 2c and the defrosting heater 5 and is in close contact with the heat receiving portion 6c that is in close contact with the outer glass tube 5c. Since the bare tube portion 2c is heated by the heat transmitted through the portions 6b and 6d, the bare tube portion 2c is efficiently heated. As a result, the frost adhering to the surface of the bare pipe part 2c melts in a short time.

  In other words, by efficiently heating the bare tube portion 2c, the heat conduction of the cooling tube 2 and the convection in the tube can be improved, and the defrosting can be efficiently performed even on the upper portion of the cooler 1 where defrosting is difficult. Thus, the defrosting time can be shortened, and the power consumption during defrosting can be greatly reduced.

  In addition, since the heat transfer plate 6 has the through portion 6e in the cover portion 6a, the heat of the defrost heater 5 is not trapped in the space formed by the heat transfer plate 6 and the defrost heater 5, The heat can be transmitted to the fins 4 of the cooler 1 by the rising airflow that escapes from the through portion 6e.

  In addition, the penetration part 6e provided in the cover part 6a of the heat-transfer plate 6 can also ventilate at the time of cooling, can also inhibit the circulation of the cool air by the blower 17, and suppress the deterioration of the cooling performance. can do.

  Furthermore, since the refrigerator is configured to conduct heat from the defrost heater 5 to the low-temperature heat transfer plate 6 and the bare pipe portion 2c (cooling pipe 2), the surface temperature of the defrost heater 5 is ignited by the flammable refrigerant. In addition, the defrosting heater 5 is a so-called double-pipe radiant heater having the inner glass tube 5b and the outer glass tube 5c, so that the combustible fluid flowing in the cooling tube 2 should be possible. Even when the leakage of the volatile refrigerant occurs, the ignition to the flammable refrigerant can be suppressed and the safety can be ensured.

  Moreover, since the refrigerator has reduced the height dimension of the cooler with a defrost heater which occupies with the defrost heater 5 and the cooler 1, as demonstrated in Embodiment 1, the volume of the cooling chamber 14 is reduced. Thus, the article storage capacity of the storage room can be increased, and the added value of the refrigerator can be increased.

  The cooler with a defrost heater according to the present invention can improve the defrost efficiency and save energy, so it is widely used in article storage devices such as household refrigerators, commercial refrigerators, showcases, and vending machines. Applicable.

The front view of the cooler with a defrost heater in Embodiment 1 of this invention Side view of cooler with defrost heater in the same embodiment The expanded sectional view of the defrost heater periphery part of the cooler with a defrost heater in the embodiment Cross-sectional perspective view of the main part showing the attachment structure of the defrost heater of the cooler with the defrost heater in the same embodiment The side view which notched some refrigerators in Embodiment 2 of this invention The enlarged view of the refrigerator part of the refrigerator in the same embodiment Expanded sectional view around the refrigerator cooler of the conventional example Vertical sectional view of a refrigerator showing a different conventional example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cooler 2 Cooling pipe 2c Bare pipe part 4 Fin 5 Defrost heater 6 Heat-transfer plate 6a Cover part 6b Adhering part 6c Heat receiving part 6d Adhering part 6e Through-part 11 Main body 13 Compressor 14 Cooling chamber 17 Blower

Claims (7)

  In a cooler having a cooling pipe through which a plurality of fins penetrates, the lowermost cooling pipe is a bare pipe part through which the fins do not penetrate, and at least the bare pipe part of the cooler is heated below the cooler. Disposing the defrosting heater, disposing the heat transfer plate heated by the defrosting heater above the defrosting heater, and further covering the heat transfer plate from above with the defrosting heater, A cooler with a defrost heater comprising a close contact portion formed continuously with the cover portion and in close contact with the bare tube portion of the cooling tube, and a heat receiving portion in close contact with the heat generating surface of the defrost heater.   The cooler with a defrost heater according to claim 1, wherein the close contact portion is a close contact portion that is bent so as to be in close contact with the outer periphery of the bare tube portion.   The cooler with a defrost heater according to claim 1 or 2, wherein the heat receiving portion is formed continuously with the close contact portion.   The cooler with a defrost heater as described in any one of Claim 1 to 3 which provided the said contact part continuously in the longitudinal direction side edge of the said heat exchanger plate.   The cooler with a defrost heater as described in any one of Claim 1 to 4 which provided the fixing function which fixes the said defrost heater to a heat exchanger plate in the said heat receiving part.   The cooler with a defrost heater as described in any one of Claim 1 to 5 which provided the penetration part in which the air by the side of the said defrost heater escapes upwards in the cover part in the said heat exchanger plate.   A refrigeration cycle apparatus comprising: a main body comprising a heat insulating box having an opening on one side; a door for opening and closing the opening; and a refrigeration cycle apparatus in which a flammable refrigerant is sealed in the main body. The article storage device in which the cooler constituting the cooler is a cooler with a defrosting heater according to any one of claims 1 to 6.

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