JPH0646133B2 - refrigerator - Google Patents

Description

Description: (a) Field of Industrial Application The present invention relates to a refrigerator provided with a control circuit board including switches and the like on the front surface of a door.

(B) Conventional Technology A conventional refrigerator of this type is disclosed, for example, in Japanese Patent Publication No. 61-44233. That is, the structure shown therein forms a recess in the front surface of the refrigerator freezer compartment, accommodates the control circuit board therein, and hides this recess with a cover plate (operation panel). The switches on the board are exposed.
This makes it easy to set the temperature of the refrigerator on the front of the door.

(C) Problems to be solved by the invention When electrostatic noise enters such a circuit board, it may cause malfunction of the refrigerator. However, in winter, etc., the body of the user of the refrigerator is likely to be charged with static electricity, and the cover plate is usually made of a synthetic resin (insulator) with good moldability. When brought close to the switch, a current (noise) due to static electricity is likely to enter into the circuit board direction through the switch surface. Therefore, in the past, an iron plate was provided near the switch on the back side of the cover plate, and this was connected to the grounded refrigerator outer box with a lead wire to allow static electricity from the switch to escape to the iron plate and prevent it from entering the circuit board direction. Was.

However, with such a structure, since the iron plate for releasing static electricity is in the recess, static electricity from the switch does not go to the iron plate but goes to the circuit board in the same recess, which is not a sufficient noise countermeasure. was there. Particularly in recent years, since the depth of the recess is becoming shallower, there is a problem that the iron plate and the circuit board come close to each other, and this tendency becomes stronger.

The present invention has been made to solve such a problem.

(D) Means for Solving the Problems The present invention has a heat-insulating door that closes the opening of the heat-insulating box, and a storage part that is open at the front and is provided in the front part of the door and is grounded. A conductive partition plate, a control circuit board having an operation part and a through hole housed in the storage part, and a cover plate having a through hole through which the operation part penetrates and covering the front surface of the storage part. A conductive thin plate which is located in the vicinity of the operation part and which is attached to the front surface of the cover plate, a decorative plate which has a through hole through which the operation part penetrates and covers the thin plate, the partition plate and the decorative plate. And a conductive spring having one end fixed to the back surface of the thin plate and the other end penetrating the through hole of the control circuit board and fixed to the partition plate.

(E) Action According to the present invention, static electricity noise that enters from the operating portion of the switch is discharged to the ground in the order of the thin plate, the spring member, and the partition plate. Further, since the thin plate is on the front surface of the cover plate, the distance between the thin plate and the control circuit board can be secured even if the storage portion becomes shallow. Further, even if the distance between the thin plate and the partition plate changes, the electric path can be held even if the spring member expands and contracts.

(F) Example Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a perspective view of the refrigerator (1). (2) is a heat-insulating box body configured by filling a heat-insulating material (not shown) between an outer box (3) made of steel plate and an inner box (not shown), and a freezing room and a refrigerating room (not shown) are formed inside. ing. Further, (4) and (5) are heat-insulating doors that open and close the front openings of the freezer compartment and the refrigerator compartment, respectively. (6) is a grounding leg attached to the bottom of the outer box (3).

Reference numeral (7) is a control unit, which is configured, for example, at the front corner of the door (4). 2 is an enlarged view of the control section (7), FIG. 3 is a sectional view taken along the line AA of FIG. 2, and FIG. 4 is an enlarged view of FIG. The door (4) is rotatable on one side of its upper end by a hinge member (8) made of thick steel plate and a hinge shaft (9) extending downward from its tip on one side of the heat insulating box (2). The hinge member (8) is screwed to the front end of the upper surface of the outer box (3). (10) is a lead wire extended from a device (not shown) inside the heat insulation box (2), and (11) is a control unit.
The lead wires connected to the control circuit board (12) described later in (7) pass through the inside of the heat insulating box (2) or the inside of the door (4), and especially the lead wire (11) is the hinge shaft (9). ), And is pulled out onto the hinge member (8), where the connector (13)
Connected at (14). Reference numeral (15) is a grounding lead wire (hereinafter referred to as "grounding wire"), one end of which is made of metal as described later as shown in FIG. It passes through the hinge shaft (9) and the other end is fixed to the hinge member (8) with a screw (18). As a result, the partition plate (26) is grounded along the path of the ground wire (15), the hinge member (8), the outer box (3) and the base leg (6). After that, the hinge member (8) is hidden by the cover (19).

The door (4) is formed by foaming and filling a heat insulating material (22) between the synthetic resin frame (20) and the inner plate (21) and the metallic front plate (17). An opening (24) is formed at the lower corner of the front plate (17), and a storage part corresponding to the opening (24) is formed on the back surface of the front plate (17) and is open toward the front and is depressed toward the heat insulating material (22). The container-shaped metal partition plate (26) having the recess (25) as the inside is attached thereto. A groove (27) opened inward is formed at the front opening edge of the frame body (20), and the edge portion of the front plate (17) is engaged and inserted in this groove (27). The part of the flange (28) at the front end of the partition plate (26) on the side of the frame body (20) is also in close contact with the rear surface of the front plate (17) and the groove (2
(7) Inserted together into the flange (28) and cut and raised (2
8A) is positioned in contact with the edge of the groove (27). The side of the flange (28) that is not on the side of the frame (20) is sealed with a sealing tape (29) while being in contact with the back surface of the front plate (17).

Reference numeral (30) is a synthetic resin cover plate for constituting the control unit (7), and the control circuit board (12) is screwed to the shaft (31) extending backward from the cover plate (30). Has been done. A plurality of switches (32), (32) are attached to the control circuit board (12), but the operation portions (32A), (32A) at the tips thereof are covered as shown in the enlarged view of FIG. Pre-formed through holes (30A), (30
A) exposed to the front. An engaging claw (34) protruding backward is formed at one end of the back surface edge of the cover plate (30), and this engages the engaging hole (35) formed at the edge of the opening (24) of the front plate (17). ), The cover plate (30) is fixed to the front plate (17), and in this state, the control circuit board (12) is housed in the recess (25). Also, cover plate (3
A hook (36) is formed at the other end of the back surface edge of (0), and this is an opening.
(24) Engage with the edge. (37) is a decorative plate made of synthetic resin, and a conductive thin plate made of aluminum foil on the back side (38)
have. The decorative plate (37) is attached to the front surface of the cover plate (30) by gluing, and the operation parts (32A) and (32A) are provided with respective through holes (37
It will penetrate A) and (38A). In this state, the thin plate (38) is sandwiched between the cover plate (30) and the decorative plate (37).

A through hole (12A) is formed in the control circuit board (12), and the front cover plate (30) is recessed and extends rearward to form the through hole (12A).
An extension that passes through A) and its bottom wall (39A) reaches the partition plate (26)
(39) is formed so as to project. This bottom wall (39A) is a partition plate from the inside of the extension (39) with a conductive screw (40) made of metal.
It is screwed to (26). Further, (41) is a conductive coil spring made of metal housed in the extended portion (39) in a slightly compressed state, one end of which is a thin plate without contacting the control circuit board (12). 38) the other end is in contact with the head of the screw (40).

Next, a procedure for assembling the door (4) will be described. First the front plate (1
7) Attach the partition plate (26) to the back side and attach both to the groove (27) of the frame (20).
Engage with. Next, lead wires from the partition plate (26) into the recess (25).
(11) is pulled in, and the ground wire (15) is connected to a proper place on the rear surface of the partition plate (26). The lead wire (11) and the ground wire (15) are attached to the frame body (20), and are pulled out of the frame body (20) from a hinge collar portion (not shown) into which the hinge shaft (9) is inserted, Then, the heat insulating material (22) is poured on the rear surface of the front plate (17), the inner plate (21) is brought into contact with the rear end of the frame body (20), and the heat insulating material (22) is foam-filled in the jig. . Next, prepare the cover plate (30) with the control circuit board (12) attached to the shaft (31) in advance,
After connecting the lead wire (11) to the control circuit board (12), cover plate
Install (30) by engaging the front plate (17). Further extension part (39)
Insert the screw (40) inside and pierce the bottom wall (39A) and screw (40)
Screw it to the partition plate (26), then attach the coil spring (41) to the extension part.
It is inserted into (39), and a decorative plate (37) having a thin plate (38) on the back surface is attached to the cover plate (30) from the front side to close the extending portion (39). Then, the door (4) is attached to the heat insulating box (2).

In this state, the coil spring (41) and the screw (40) form an electric path between the thin plate (38) and the partition plate (26), and the thin plate (38) is connected to the ground wire (1
It will be grounded to the ground by 5). As a result, even if the user is charged, the static electricity from the finger touching the operation part (32A) of the switch (32) escapes to the thin plate (38) close to the operation part (32A), and the coil spring (41), screw (40),
The partition plate (26), the grounding wire (15), the hinge member (8), the outer box (3) and the base leg (6) are discharged to the ground through the path (there is a few thousand volts, so there is no problem in capacity). It does not flow into the control circuit board (12) side, so that the malfunction of the control circuit is prevented. or,
Since the thin plate (38) is on the front surface of the cover plate (30) and not inside the recess (25), even if the depth of the recess (25) becomes shallow, the thin plate (38) and the control circuit board (12) The distance can be secured, and malfunctions due to noise can be reliably prevented.

Furthermore, even if the distance between the thin plate (38) and the partition plate (26) fluctuates slightly due to an assembly error, it can be absorbed by the expansion and contraction of the coil spring (41), and the restoring force of the coil spring (41) ensures contact. The electric path between the thin plate (38) and the partition plate (26) is secured, and the assembly is extremely easy.

(G) Effect of the Invention According to the present invention, the static electricity transmitted from the fingers to the operating portion when the operating portion is operated is a conductive thin plate located near the operating portion,
Since the conductive spring and the partition plate are transmitted in this order and discharged to the ground, they are not discharged to the control circuit board and malfunction due to static electricity can be prevented. In particular, the distance between the operation unit and the thin plate can be made smaller than the distance between the operation unit and the control circuit board regardless of the depth of the storage unit, so that a reliable countermeasure against static electricity can be achieved.

[Brief description of drawings]

Each drawing shows an embodiment of the present invention. FIG. 1 is a perspective view of a refrigerator, FIG. 2 is an enlarged perspective view of a control unit, and FIG. 3 is a sectional view taken along the line AA of FIG. The figure is an enlarged view of FIG. (1) …… Refrigerator, (2) …… Insulation box, (4) …… Door, (12)…
… Control circuit board, (15) …… ground wire, (25) …… recess, (2
6) Partition plate, (30) …… Cover plate, (32) …… Switch, (37)
…… Decorative plate, (38) …… thin plate, (41) …… Coil spring.

Claims (1)

[Claims] 1. A heat-insulating door for closing an opening of a heat-insulating box (4)
An electrically conductive partition plate (26) provided on the front of the door and having a storage section (25) open to the front, and an operation section (32A) and a through hole stored in the storage section. (12A) having a control circuit board (12), a cover plate (30) having a through hole (30A) through which the operation portion penetrates and covering the front surface of the storage portion, and in the vicinity of the operation portion. A conductive thin plate (38) located on the front surface of the cover plate, a decorative plate (37) having a through hole (37A) through which the operation portion penetrates and covering the thin plate, the partition plate and the decorative plate. A conductive spring (41) located between the plate and one end fixed to the back surface of the thin plate and the other end penetrating the through hole (12A) of the control circuit board and fixed to the partition plate. A refrigerator characterized by that.