JP3803834B2 - Electric heater wire mounting structure to the body in the internal / external pressure balancing device of the refrigerator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure for attaching an electric heater wire to a body in a refrigerator, in particular, an internal / external pressure balancing device for a large commercial refrigerator.
[0002]
In this specification, the term “refrigerator” includes a freezer.
[0003]
[Prior art and problems to be solved by the invention]
In the refrigerator, when the heater is heated to defrost the evaporator, the internal temperature rises, and the internal pressure becomes higher than the external pressure, and as a result, the door may open. On the other hand, when the pressure inside the chamber becomes lower than the pressure outside the chamber due to cooling, the door becomes difficult to open. Furthermore, when pressure is generated inside and outside the refrigerator as described above, the wall of the cabinet may be distorted.
[0004]
Therefore, in order to solve such a problem, a normally closed valve that closes the opening is formed in a metal body that is fitted into a through hole formed in the refrigerator wall and can close the through hole. An internal / external pressure balancing device of a refrigerator to which is attached has been used.
[0005]
By the way, in such an internal / external pressure balancing device, an electric heater wire is attached to the body in order to prevent the normally closed valve from icing to the body due to freezing of water droplets attached to the body. .
[0006]
There are, for example, three types of conventional structures for attaching an electric heater wire to a body as shown in FIGS.
[0007]
In FIG. 5, the electric heater wire (30) is attached to the metal body (33) with a tape (32) made of a metal foil such as an aluminum foil coated with an adhesive (31) on one side.
[0008]
However, in this case, since the electric heater wire (30) and the body (33) are in line contact with each other, the heat transfer efficiency from the electric heater wire (30) to the body (33) is extremely poor, and the electric There is a problem that it is necessary to wind the heater wire (30) several times, resulting in an increase in power consumption. Also, since the electric heater wire (30) is attached by a tape (32) coated with an adhesive (31) on one side, the electric heater wire (30) is attached to the body (33) and replaced. There is a problem that is troublesome. Furthermore, when the electric heater wire (30) is energized, the adhesive (31) burns and generates heat, and this heat and the heat generated from the electric heater wire (30) cause the silicon from the electric heater wire (30). The resulting coating (30a) may be seized, and the heating wire (30b) may be exposed to cause electric leakage.
[0009]
In FIG. 6, blade portions (30c) extending on both sides in the tangential direction are integrally provided on the covering (30a) of the electric heater wire (30), and the electric heater is applied by the adhesive (31) applied to the blade portion (30c). A wire (30) is attached to the metal body (33).
[0010]
In this case, the heat transfer efficiency from the electric heater wire (30) to the body (33) is improved as compared with the case shown in FIG. 5, but the blade portion (30c) is integrated with the coating (30b) of the electric heater wire (30). There is a problem that the cost increases. In addition, since the electric heater wire (30) is attached by the adhesive (31) applied to the blade portion (30c), the electric heater wire (30) can be attached to and replaced by the body (33). There is a problem that it is troublesome. Furthermore, when the electric heater wire (30) is energized, the adhesive (31) burns and generates heat, and this heat and the heat generated from the electric heater wire (30) cause the silicon from the electric heater wire (30). The resulting coating (30a) may be seized, and the heating wire (30b) may be exposed to cause electric leakage.
[0011]
In FIG. 7, a metal body (33) is formed by connecting two component members (33A) (33B), and the corners of the butted portions of both component members (33A) (33B) are rounded, In the state where the electric heater wire (30) is fitted in the groove (34) formed by the round-shaped portions (34A) (34B) of the two component members (33A) (33B), the adhesive (31 ) Is attached to the metal body (33) by a tape (32) made of a metal foil such as an aluminum foil. In this case, since the electric heater wire (30) is in line contact with the body (33) at two locations, the heat transfer efficiency from the electric heater wire (30) to the body (33) is higher than that shown in FIG. Although the electric heater wire (30) is attached by the tape (32) coated with the adhesive (31) on one side, the electric heater wire (30) is attached to the body (33) and There is a problem that the replacement work is troublesome. Furthermore, when the electric heater wire (30) is energized, the adhesive (31) burns and generates heat, and this heat and the heat generated from the electric heater wire (30) cause the silicon from the electric heater wire (30). The resulting coating (30a) may be seized, and the heating wire (30b) may be exposed to cause electric leakage.
[0012]
The object of the present invention is to solve the above-mentioned problems, excellent in heat transfer efficiency from the electric heater wire to the body, easy to install and replace the electric heater wire, there is no risk of electric leakage, and the cost of the electric heater wire An object of the present invention is to provide an electric heater wire mounting structure for a body in an inexpensive internal / external pressure balancing device.
[0013]
[Means for Solving the Problems]
The electric heater wire mounting structure to the body in the internal / external pressure balancing device of the refrigerator according to the present invention is fitted in a through hole formed in the refrigerator wall, and an opening is formed in a metal body that can close the through hole, In an internal / external pressure balancing device of a refrigerator in which a normally closed valve for closing an opening is attached to a body, an electric heater wire is attached to the body, a heater wire insertion groove is formed in the body, and the electric heater wire is inserted fitted into the groove, from the outside of the electric heater wire, cross section arcuate pressing member made of an elastic body having heat cold resistance, forced into the fitting groove are deformed in cross-section U-shaped fitting insertion The electric heater wire is fixed by the pressing member in contact with the bottom surface and both side surfaces of the fitting groove.
[0014]
According to the mounting structure of the present invention, since the electric heater wire is fitted in the fitting groove and fixed in contact with the bottom surface and both side surfaces of the fitting groove, the electric heater wire makes line contact with the body at three positions. Thus, the heat transfer efficiency from the electric heater wire to the body is improved as compared with the conventional one shown in FIGS. In addition, since the electric heater wire is fitted into the insertion groove, and the electric heater wire is fixed by a pressing member made of an elastic body having heat resistance and cold resistance that is forcibly inserted into the insertion groove from the outside. There is no need to use an adhesive to fix the heater wire, and the installation and replacement work of the electric heater wire is simpler than the conventional one shown in FIGS. In addition, since no adhesive is used for fixing the electric heater wire, it is possible to prevent the burn-in of the coating caused by the burning of the adhesive even when the electric heater wire is energized. Further, it is not necessary to integrally provide a blade portion as shown in FIG.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0016]
In addition, the left side of FIG. 1 is a warehouse outer side, and the right side is a warehouse inner side.
[0017]
1 to 4, a through hole (2) having a square cross section is formed at an appropriate location on the warehouse wall (1) of a large commercial refrigerator, and the internal / external pressure balancing device of the refrigerator is formed at the through hole (2). (3) is installed.
[0018]
The internal / external pressure balancing device (3) has a horizontally-bottomed rectangular tube shape with an open end at the inner side and a closed end at the outer side, and is fitted into the through-hole (2) and is inserted into the through-hole (2). The body (4) includes an aluminum body (including aluminum alloy, the same shall apply hereinafter). The peripheral wall (4a) of the body (4) is slightly smaller than the through hole (2), and there is a gap between the inner peripheral surface of the through hole (2). In addition, an outward flange (4b) is formed integrally with the inner end of the peripheral wall (4a) of the body (4), and the outward flange (4b) is a through-hole (2 in the inner side surface of the warehouse wall (1). ), The body (4) is fixed to the storage wall (1) by screwing the screw (5) passing through the outward flange (4b) into the storage wall (1).
[0019]
A first inclined wall portion (6) inclined downward toward the outside of the warehouse is provided on the upper portion of the closed wall portion (4c) at the outer end of the body (4). A second inclined wall portion (7) inclined in the direction is provided continuously to the first inclined wall portion (6). A plurality of openings (8) and (9) are formed in each inclined wall portion (6) and (7). A normally closed valve (10) (11) made of an elastic body having heat and cold resistance such as silicon rubber and closing all the openings (8) (9) on the upper surface side of both inclined wall portions (6) (7). ) And the upper end of each normally closed valve (10) (11) is positioned above the opening (8) (9) in each inclined wall (6) (7) by appropriate means. It is fixed.
[0020]
A thick part (12) is formed at the inner end of the peripheral wall (4a) of the body (4), and the annular heater wire insertion groove (13) is entirely formed on the surface of the thick part (12) facing the inner side. An electric heater wire (14) having a circular cross section is fitted into the groove (13). The width of the bottom end portion of the heater wire insertion groove (13) is substantially equal to the outer diameter of the electric heater wire (14). The connecting portion between the bottom surface of the heater wire insertion groove (13) and the outer side surface of the body (4) has an arcuate cross section, and the curvature of the arcuate portion (13a) is the curvature of the electric heater wire (14). It is equal to. The width of the insertion groove (13) gradually increases toward the opening side, and has heat and cold resistance such as silicon rubber forcedly inserted into the groove (13) from the outside of the electric heater wire (14). The electric heater wire (14) is fixed by a pressing member (15) made of a body. At this time, the electric heater wire (14) is in line contact with the bottom surface and both side surfaces of the fitting groove (13), and a part of the peripheral surface is in surface contact with the arcuate portion (13a). Thus, the heat transfer efficiency from the electric heater wire (14) to the body (4) becomes excellent, and the number of turns of the electric heater wire (14) can be reduced. The presser member (15) presses the electric heater wire (14) over almost the entire length thereof. Therefore, no adhesive is required to fix the electric heater wire (14), the electric heater wire (14) can be easily and reliably attached, and the electric heater wire (14) can be easily replaced. be able to. In addition, since it is not necessary to use an adhesive, it is possible to prevent the coating of the electric heater wire (14) from being burned by the adhesive.
[0021]
A wide portion (13b) is formed in a part of the heater wire insertion groove (13), and a thermostat (16) connected to the electric heater wire (14) is fitted therein. In addition, a notch (17) is formed in a part of the side wall on the inside of the body (4) of the fitting groove (13), and both ends of the electric heater wire (14) are passed through the notch (17) from the groove (13). It is led inside the peripheral wall (4a). Both ends of the electric heater wire (14) are connected to the lead wire (18).
[0022]
An aluminum gallery (19) is arranged so as to cover the outer edge of the through hole (2), and a screw (20) penetrating the peripheral edge of the through hole (2) is screwed into the outer wall (1) of the warehouse wall (1). ) It is fixed to the outer surface. The gallery (19) is provided with an insect net (21). In addition, an aluminum gallery (22) is arranged so as to cover the inner end of the through hole (2), and a screw (5) fixing the body (4) to the warehouse wall (1) is used. The peripheral edge is fixed to the inner surface of the warehouse wall (1). The gallery (22) has an insect net (23).
[0023]
The lead wire (18) extends through the peripheral wall of the body (4) to the outside of the body (4), and extends through the outer side gallery (19) to the outside of the chamber.
[0024]
In such a configuration, normally, the normally closed valves (10) and (11) are in close contact with the upper surfaces of the inclined wall portions (6) and (7) due to their own weight, thereby closing the openings (8) and (9). It is peeling off.
[0025]
As in the case of defrosting, if the pressure balance inside and outside the refrigerator is broken and the internal pressure increases beyond the external pressure, the normally closed valve (10) attached to the first inclined wall (6) As indicated by the chain line A in FIG. 1, the opening (8) is opened by swinging slightly outside while being bent slightly, the inside and outside of the refrigerator are in communication and the air inside the box escapes outside and the pressure inside and outside the box Is balanced. Thereafter, the normally closed valve (10) swings in the reverse direction due to its own weight, and returns to its original shape by the elastic force, and closes the opening (8) in close contact with the upper surface of the first inclined wall (6).
[0026]
On the other hand, if the internal pressure decreases due to cooling, the normally closed valve (11) attached to the second inclined wall (7) is slightly bent inside the storage as shown by the chain line B in FIG. It swings and the opening (9) is opened, the inside and outside of the refrigerator are in communication with each other, and the outside air flows into the inside to balance the inside and outside pressure. At this time, dust and the like are not blocked by the cracks and enter the refrigerator. Thereafter, the normally closed valve (11) swings in the reverse direction due to its own weight, and returns to its original shape by the elastic force, and closes the opening (9) in close contact with the upper surface of the second inclined wall (7).
[0027]
Due to the action of the thermostat (16), the electric heater wire (14) is energized when the temperature in the vicinity of the body (4) drops below the specified temperature, so water droplets such as condensed water adhering to the body (4) Freezing prevents each normally closed valve (10) (11) from icing on each inclined wall (6) (7). Further, when the temperature in the vicinity of the body (4) becomes equal to or higher than a predetermined temperature, the energization of the electric heater wire (14) is stopped by the action of the thermostat (16).
[0028]
【The invention's effect】
According to the electric heater wire mounting structure to the body in the refrigerator internal / external pressure balancing device of the present invention, as described above, the heat transfer efficiency from the electric heater wire to the body is improved as compared with the conventional one. The number of turns of the heater wire can be reduced, and power consumption is reduced. Further, since it is not necessary to use an adhesive for fixing the electric heater wire, the electric heater wire can be easily attached and replaced. In addition, since no adhesive is used to fix the electric heater wire, it is possible to prevent seizure of the coating due to scorching of the adhesive even when the electric heater wire is energized, thereby preventing electric leakage. Furthermore, it is not necessary to make the covering of the electric heater wire into a special shape, and the cost of the electric heater wire is reduced.
[Brief description of the drawings]
FIG. 1 is a vertical sectional view showing an embodiment of the present invention, in a state where an internal / external pressure balancing device is assembled to a refrigerator.
FIG. 2 is a front view of the internal / external pressure balancing device assembled in the refrigerator as seen from the inside of the refrigerator.
FIG. 3 is a partially cutaway perspective view of the internal / external pressure balancing device.
FIG. 4 is a partially enlarged view of FIG. 1;
FIG. 5 is a partially enlarged sectional view showing a conventional example of a structure for attaching an electric heater wire to a body.
FIG. 6 is a partially enlarged cross-sectional view showing another conventional example of a structure for attaching an electric heater wire to a body.
FIG. 7 is a partially enlarged cross-sectional view showing still another conventional example of a structure for attaching an electric heater wire to a body.
[Explanation of symbols]
(1) Warehouse wall
(2) Through hole
(3) Internal / external pressure balancing device
(4) Body
(8) Opening
(9) Opening
(10) Normally closed valve
(11) Normally closed valve
(13) Heater wire insertion groove
(14) Electric heater wire
(15) Presser member

Claims (1)

An internal / external pressure balancing device for a refrigerator in which an opening is formed in a metal body that is fitted in a through hole formed in a refrigerator wall and can close the through hole, and a normally closed valve that closes the opening is attached to the body. In the structure of attaching an electric heater wire to the body,
A heater wire insertion groove is formed in the body, an electric heater wire is inserted into the insertion groove, and a cross-section arc-shaped holding member made of an elastic body having heat resistance and cold resistance is provided from the outside of the electric heater wire. In an internal / external pressure balancing device for a refrigerator that is deformed into a letter shape and is forcedly inserted into an insertion groove, and the electric heater wire is fixed in a state of being in contact with the bottom surface and both side surfaces of the insertion groove by a pressing member. Electric heater wire mounting structure on the body.

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