JP2006064288A - Door structure for storage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure the safety relating to erectric insulation without using a grounding wire, a transformer or the like. <P>SOLUTION: Second wiring 56 connected with one end part of a cord heater 44 mounted inside of a door 20 is stuck up to a protective material 52, then inserted into an upper conduit tube 50 and pulled out from a door upper end part. Third wiring 58 connected with the other end part of the cord heater 44 is stuck up to the protective material 52, and inserted into a lower conduit tube 50. First wiring 54 is inserted into the upper and lower conduit tubes 50, 50, and connected with the third wiring 58 at its lower end part. Then the first wiring 54 and the second wiring 56 pulled out from the upper conduit tube 50 are connected with a power source unit. Each wiring 54, 56, 58 constituting a lead wire 48 positioned inside of the door 20 is covered with an outer glass plate 40, a protective material 52, the conduit tubes 50, 50, a bearing 60 or a heat insulating material 36 to be doubly insulated. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a storage door structure in which a code heater for preventing condensation is disposed on a door with a window provided with a transparent plate that allows the inside of the storage to be seen through.

A storage such as a refrigerator or a freezer is configured by forming a heat insulating box so as to open forward, and assembling a door that opens and closes the opening to the heat insulating box. Here, many door glass doors with glass windows have been proposed, and glass windows are provided so that articles stored in the warehouse can be viewed from outside without opening the door. . A door provided with such a glass window has a drawback that it is difficult to visually recognize an article housed inside because the condensed water adheres to the glass window. Therefore, a cord heater is provided so as to surround the glass window, and the temperature difference between the inside and outside is eliminated by heating the heater to prevent condensation (for example, see Patent Document 1).
JP 2000-35275 A

  In the door disclosed in Patent Document 1, a box for storing a part of a lead wire for connecting a cord heater and an electrical box disposed on the side of the cabinet body is provided in the door, and an excess portion of the lead wire is provided in the box. By being housed, the lead wire handling operation and the assembly operation can be easily performed. However, the lead wire housed in the box is insufficiently insulated because the conductor such as a metal wire is only covered with the covering material, and a ground wire for the door needs to be provided separately. Is complicated. In addition, although it is possible to ensure the safety regarding insulation by using a low-voltage cord heater, in this case, a dedicated transformer is required, resulting in a problem that costs increase.

  That is, the present invention has been proposed to solve these problems in view of the above-mentioned problems inherent in the prior art, and is a storage that can ensure safety regarding insulation without using a ground wire or a transformer. The purpose is to provide a door structure.

In order to overcome the above-mentioned problems and achieve the intended purpose, the storage door structure according to the present invention includes:
Storage door structure in which a transparent plate is disposed on a door that opens and closes an opening formed in a housing, and a cord heater that prevents condensation on the transparent plate is disposed inside the door. In
The lead wire for connecting the cord heater to an external power source is covered with an insulator to cover the entire length of the portion of the lead wire located in the door and covered with an insulator, thereby being double insulated. To do.

  According to the door structure of the storage according to the present invention, the insulation of the lead wire facing the door can be ensured without using a ground wire or a transformer, and the wiring can be handled by double insulation. Can be prevented from becoming complicated and costly.

  Next, the door structure of the storage according to the present invention will be described below with reference to the accompanying drawings by giving a preferred embodiment. In the embodiment, a refrigerated showcase will be described as a storage. However, the storage is not limited to a refrigerated showcase, and is a storage such as a refrigerator or a freezer, which includes a door having a see-through window provided with a see-through plate. If it is.

  As shown in FIG. 2, the refrigerated showcase 10 of the embodiment has a storage chamber 14 for storing articles such as foods and beverages inside a housing 12 of a heat insulating structure that forms the main body thereof, The housing 12 has an opening 12 a that opens to the front side and serves as an entry / exit port for communicating with the storage chamber 14. The casing 12 is provided with an upper hinge member 16 and a lower hinge member 18 corresponding to the upper and lower opening edges on the right side (see FIG. 2) of the opening 12a. A single-open door 20 is disposed in the housing 12 so as to be rotatable in a state where the upper and lower ends of the right side thereof are pivotally supported by the upper and lower hinge members 16, 18. It is configured to be openable and closable. That is, the door 20 according to the embodiment is opened to the right so as to rotate around the right edge. A machine room 22 is defined above the casing 12, and a cooling device (not shown) including a compressor, a condenser, a condenser fan, and the like is housed in the machine room 22 to operate the cooling device. Thus, the storage chamber 14 is configured to be cooled. The machine room 22 is provided with a power supply unit (external power supply) 24 for supplying power to a cord heater 44 (described later) via a lead wire 48.

  As shown in FIG. 1, the door 20 has an exterior plate 26 that faces the outside of the cabinet and opens rearward, an interior plate 28 that faces the inside of the cabinet, and is assembled at a predetermined distance from the exterior plate 26. A multi-layer glass plate (transparent plate) 30 formed in a shape, a first packing 32 attached to the exterior plate 26 and in close contact with the plate surface located outside the warehouse of the multi-layer glass plate 30, and attached to the interior plate 28 Second packing 34 that is in close contact with the surface of the multilayer glass plate 30 located inside the cabinet, and a heat insulating material 36 made of an insulating material such as urethane foam that is foam-filled between the inner and outer plates 26, 28. Basically composed. In the embodiment, as the multi-layer glass plate 30, a glass plate in which an outer glass plate 40 and an inner glass plate 42 are arranged at a predetermined interval in the front-rear direction (inner and outer directions) through a spacer 38 is employed. The multi-layer glass plate 30 is an insulator formed from glass as an insulating material.

  In the exterior plate 26, a vertically long first opening 26a is formed at substantially the center of the rectangular main body, and the first packing 32 is attached over the entire periphery of the opening edge of the exterior plate 26. . Further, the interior plate 28 is provided with a vertically long second opening portion 28a that is substantially aligned with the first opening portion 26a at substantially the center of the rectangular main body, and the entire circumference of the opening edge of the interior plate 28 is provided. The second packing 34 is attached over the entire area. The multi-layer glass plate 30 is sandwiched from inside and outside by both packings 32 and 34 so that a glass window is formed. The packings 32 and 34 are made of an insulating material such as rubber, and the multilayer glass plate 30 sandwiched between the packings 32 and 34 is insulated from the exterior plate 26 and the interior plate 28. .

  As shown in FIG. 1, the outer surface of the outer glass plate 40 extends along the first packing 32 at a portion covered by the heat insulating material 36 on the outer edge side from the contact position of the first packing 32. A cord heater 44 is attached to do so. The cord heater 44 is energized through a lead wire 48 to be described later to generate heat, thereby warming the outer glass plate 40 and preventing the occurrence of condensation or the like. Here, the cord heater 44 is adhered to the outer glass plate 40 so as to be covered with the aluminum foil tape 46, and when the cord heater 44 is heated, the heat is efficiently transmitted to the outer glass plate 40. Configured to do.

  Both ends of the cord heater 44 are connected to a lead wire 48 at a pivotal support side (right side in a front view) of the door 20 and at a substantially intermediate position in the vertical direction of the door 20. The lead wire 48 is obtained by coating a conductor 48a such as a copper wire with a covering material 48b made of a synthetic resin, which is an insulating material, and itself has a required insulating property. In addition, a pair of tubular electric pipes (pipe bodies) 50 and 50 are embedded in the heat insulating material 36 inside the door 20 so as to extend in the vertical direction. The lead wire 48 is inserted inside. As shown in FIG. 3, the two conduits 50 and 50 are configured to be spaced apart from each other by a predetermined distance across the middle of the door 20 in the vertical direction, and the lead wire 48 can be inserted through the opposed openings 50a and 50a. The The conduits 50 and 50 are insulators made of synthetic resin, which is an insulating material, and function to insulate the lead wires 48 inserted therein from the exterior plate 26 and the interior plate 28.

  As shown in FIG. 1, the outer surface comes into contact with the inner surface (surface on the heat insulating material side) of the exterior plate 26 in the region until the lead wire 48 connected to the cord heater 44 is inserted into the conduits 50 and 50. A plate-like protective material (insulator) 52 made of foamed polystyrene, which is an insulating material, is disposed, and a lead wire 48 is attached to the inner surface of the protective material 52 covered with the heat insulating material 36. That is, the portion of the lead wire 48 exposed to the outside of the conduits 50 and 50 is covered with the protective material 52 and the heat insulating material 36, which are insulators, so as to be completely insulated from the exterior plate 26 and the interior plate 28. is there. The connecting portion of the lead wire 48 to the cord heater 44 is not covered with the protective material 52 as shown in FIG. 1, but this portion is also covered with the outer glass plate 40 and the heat insulating material 36 which are insulators. It has come to be.

  As shown in FIG. 3, the lead wire 48 is inserted through the both conduits 50, 50 and extends in the vertical direction of the door 20, and ends thereof from the upper and lower door end surfaces of the door 20, respectively. The first wiring 54 arranged so as to be able to be pulled out and one end thereof is connected to one of the cord heaters 44 and the other end inserted through the upper conduit 50 is arranged so as to be able to be pulled out from the upper end surface of the door 20. From the second wiring 56 and a third wiring 58 that has one end connected to the other end of the cord heater 44 and the other end inserted through the lower conduit 50 from the lower end surface of the door 20. It is configured. And, in a state where the lower end portion of the first wiring 54 and the other end portion of the third wiring 58 are connected in the lower conduit 50, from the opening facing the upper end side of the door 20 in the upper conduit 50, The upper end portion of the first wiring 54 and the other end portion of the second wiring 56 are drawn out.

  Cylindrical bearings (tubes) 60, 60 penetrating in the vertical direction are embedded in the upper and lower ends of the pivot side of the door 20, and one opening end is opened on the corresponding end face side, and the door The corresponding conduit 50 is connected to the other open end located inward. A hinge shaft (not shown) protruding from the upper and lower hinge members 16 and 18 is rotatably fitted to the bearings 60 and 60, so that the door 20 is pivotally supported. It has become so. Each hinge shaft has a through hole, and lead wires 48 (first wiring 54 and second wiring 56) wired in the upper conduit 50 are inside the bearing 60 and through the hinge shaft. And, it is introduced into the machine room 22 through a hole (not shown) provided in a cover that covers the front surface of the machine room 22 and is connected to the power supply unit 24. The bearing 60 is an insulator made of a synthetic resin, which is an insulating material. The outer end of the bearing 60 protrudes from the corresponding end surface of the door 20 with a predetermined length, and a lead wire 48 inserted through the bearing 60 is inserted. It is configured to be insulated from the exterior plate 26 and the interior plate 28.

  The door 20 according to the embodiment can be opened left by reversing the top and bottom. In this case, the first wiring 54 and the first wiring 54 constituting the lead wire 48 wired in the conduit 50 are arranged. Three wires 58 are introduced into the machine room 22 through the interior of the bearing 60, the hinge shaft through hole and the cover hole, and connected to the power supply unit 24. At this time, the first wiring 54 and the second wiring 56 are connected in the conduit 50.

(Effects of Example)
Next, the operation of the storage door structure according to the embodiment will be described. First, a procedure for manufacturing the door 20 will be described. The first packing 32 is attached over the entire circumference of the opening edge of the exterior plate 26. In this state, the multi-layer glass plate 30 in which the outer plate 26 is positioned and placed on a jig (not shown) so as to open upward, and the code heater 44 is adhered to the outer surface of the outer glass plate 40 is used as the first packing. The protective material 52 is disposed on the outer edge side of the outer plate 26 from the position where the first packing 32 is disposed. Further, the second wiring 56 and the third wiring 58 in the lead wire 48 connected to the cord heater 44 are adhered to the opposite side of the protective material 52 from the exterior plate 26, and the wirings 56, 58 are inserted. At the same time, conduits 50 and 50 having bearings 60 connected to one end are arranged. The conduits 50 and 50 are inserted with the first wiring 54 constituting the lead wire 48, and one end thereof is connected to the third wiring 58 inside the conduit 50, and the first wiring The other end portion of 54 and the end portion of the second wiring 56 are drawn out to the outside through the conduit 50 and the bearing 60.

  Next, the second packing 34 is attached over the entire periphery of the opening edge of the interior plate 28, and the interior plate 28 is aligned with the upper opening of the exterior plate 26. At this time, the second packing 34 is in close contact with the inner glass plate 42, and the multi-layer glass plate 30 is not in direct contact with the exterior plate 26 and the interior plate 28, and the first packing 32 and the second packing 34. It is pinched by. Then, with the interior plate 28 fixed with a jig (not shown), a required amount of foaming liquid is injected between the exterior plate 26 and the interior plate 28 from a hole (not shown) formed in the exterior plate 26. Foam. Thereby, the door 20 provided with the glass window is manufactured.

  In the door 20 manufactured as described above, the lead wire 48 located inside the door 20 has an outer side of the coating material 48b on the outside, the outer glass plate 40, the heat insulating material 36, the protective material 52, and the conduit 50. Alternatively, it is covered with a bearing 60 and double insulated. That is, the connection portion between the second wire arrangement 56 constituting the lead wire 48 and the code heater 44 in the third wiring 58 is covered with the outer glass plate 40 and the heat insulating material 36. Further, the second wiring 56 and the third wiring constituting the lead wire 48 facing the region from the portion covered with the outer glass plate 40 and the heat insulating material 36 to being inserted into the openings 50a, 50a of the conduits 50, 50. The portions of the wiring 58 and the first wiring 54 that are exposed between the two conduits 50 and 50 are both covered with the protective material 52 and the heat insulating material 36. Furthermore, the first wiring 54 and the second wiring 56 that are inserted into the conduit 50 from the opening 50 a and drawn out through the bearing 60 are covered with the conduit 50 and the bearing 60. The third wiring 58 inserted into the conduit 50 is also covered by the conduit 50.

  Thus, since the lead wire 48 located inside the door 20 is double-insulated over the entire length thereof, the stability against insulation is high. Therefore, it is not necessary to provide a ground wire for the door 20 or use a transformer for a low-voltage cord heater, and the wiring operation can be simplified and the cost can be reduced.

  In the examples, the case where a multi-layer glass plate is employed as the transparent plate has been described. However, the glass plate may be composed of a single glass plate, and the material thereof is transparent as long as it is an insulating material. It may be a synthetic resin. Further, the bearings, the conduits, and the protective material are not limited to the materials shown in the embodiments, and may be formed of other insulating materials.

1 is a cross-sectional plan view of a door according to a preferred embodiment of the present invention. It is a front view which shows the refrigerated showcase in which the door which concerns on an Example is arrange | positioned. It is a rear view which partially cuts and shows the door which concerns on an Example.

Explanation of symbols

12 housing, 12a opening, 20 door, 24 power supply unit (external power supply)
30 Multi-layer glass plate (transparent plate, insulator), 44 Code heater, 48 Lead wire 48b Coating material, 50 Conduit (insulator, tube), 52 Protective material (insulator)
60 Bearing (insulator, tube)

Claims (2)

A transparent plate (30) is disposed on the door (20) that opens and closes the opening (12a) opened in the housing (12), and condensation on the transparent plate (30) is prevented. In the door structure of the storage where the cord heater (44) is placed inside the door (20),
The lead wire (48) connecting the cord heater (44) to the external power source (24) covers the entire length of the portion located in the door, and the outside of the covering material (48b) made of an insulating material of the lead wire (48). A door structure of a storage, characterized in that it is covered with an insulator (30, 50, 52, 60) and double insulated. The insulator is the transparent plate (30) made of an insulating material, a synthetic resin tube (50, 60) or a protective material (52) made of polystyrene foam, which is housed in the door (20). The storage door structure described.

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