JPS61282684A - Electromagnetic damper device for refrigerator - Google Patents

Abstract

PURPOSE:To slow reciprocating motion of a lever and to decrease the generation of impact noise, by a method wherein a braking device, formed such that a resistance material is located between an actuating member and a stationary shaft, is mounted to the holding body of an electromagnetic device. CONSTITUTION:A braking device 14 is constituted such that a gearlike actuating member 17, rotatably supported on a stationary shaft 16 laterally projected from a support plate 15 secured to a case 1, and teeth 18, geared with teeth formed in the outer peripheral surface of an actuating member 17, are formed in the end part on the plunger 8 side of a lever 3. A gap is formed between the stationary shaft 16 and the actuating member 17, and the gap is filled with oil 19, having high viscosity, working as a resistance material throughout the whole periphery of the stationary shaft 16. Further, the actuating member 17 is rotatably held on the stationary member 16 through the medium of the oil 19.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to an electromagnetic damper device for opening and closing a cold air passage of a refrigerator.

(b) Prior Art An electromagnetic damper device for opening and closing the cold air outlet of a conventional refrigerator is disclosed in Japanese Utility Model Application No. 59-36491.

to this? When the plunger (1) is attracted to the iron core (2) by energizing the electromagnetic coil (c3η), the plunger (1) collides with the iron core (2) and generates an impact sound.

From this point K, the baffle plate (to) is located at the cold air outlet portion (10
a) is in an open state. On the other hand, the plunger (to), which sends a current in the opposite direction to the electromagnetic coil c3η, is separated from the iron core (b), and the action of the spring 01) is also applied, and the buckle plate (
) strongly collides with the cold air outlet portion (10a) and generates an impact sound at that time. These impact sounds are extremely annoying when the refrigerator is installed in a quiet room.

To prevent the impact of the plunger field hitting the iron core (b) K, attach a silicone rubber cushioning material [F]υ to the plunger (to) to hold it down with a washer (6G) as shown in Figure 7. It is possible to maintain a gap of 2!3 between the tip of the tip (to) and the iron core (b). In this case, as shown in Figure 8, there is no gap (6!) (with respect to Pl). (In Q, the suction force on plunger ■ decreases, so it is insufficient to suction plunger 00) against the force of coil spring C31, so the solenoid plunger α stage is made larger. Or, it is necessary to reduce the acting force of the coil spring Oυ.If the solenoid plunger Kasumi is made large, the electromagnetic damper device (1~) becomes large and expensive, and the inside of the refrigerator becomes narrow, and the acting force of the coil spring C110 is reduced. If it is decreased, the force of the baffle plate to close the cold air outlet portion (10a) will be weakened, causing cold air leakage, resulting in the inside of the refrigerator being unnecessarily cold.

H1 Problems to be Solved by the Invention In view of the above-mentioned drawbacks, the present invention satisfactorily closes the air passage by the buckle plate and sufficiently reduces the impact noise of the plunger and the baffle plate. In addition, sufficient suction power can be secured to achieve stable operation.
The purpose of the present invention is to provide a small electromagnetic damper device suitable for being incorporated into a refrigerator.

B) Means for Solving the Problems The present invention provides a means for achieving the above object, in which the intermediate portion is rotatably supported, and an opening/closing plate for opening and closing the air passage is supported on one end side of the support portion, and the support portion An electromagnetic damper device comprising a lever connected to a plunger of an electromagnetic device at the other end, and a spring that biases the opening/closing plate in a direction to close the air passage, an actuating member interlocking with the lever; The electromagnetic brake device includes a fixed shaft rotatably supported as an operating member, and a resistive material interposed between the operating member and the fixed shaft to slow the reciprocating movement of the lever. The electromagnetic damper device for a refrigerator is provided on a device holder and is connected to the lever between the plunger and the support portion.

(e) Operation By energizing the electromagnetic coil and reciprocating the plunger, the lever rotates back and forth, and accordingly, the baffle plate opens and closes the air passage. In this case, the actuating member also rotates with the reciprocating rotation of the lever, but the resistance substance interposed between the actuating member and the fixed shaft creates a large rotational resistance of the actuating member, which prevents the reciprocating movement of the lever. The opening and closing of the baffle plate and the reciprocating movement of the plunger also become slow, and the above-mentioned impact noise is sufficiently reduced.

(F) Embodiment FIG. 1 shows an electromagnetic damper device according to the present invention. (1) is a synthetic resin case that houses an electromagnetic device (2) and constitutes an electromagnetic device holder. (3) connects the middle part to the axis (5
) is a lever rotatably supported via the support part (
6) An opening/closing plate (which rotatably supports the force) for opening and closing the air passage on one end side, and an electromagnetic device (2) on the other end side of this support part (6).
) are rotatably connected to the plunger (8)K.

(9) is the plunger (
8) A coil spring surrounding the plunger (
8) in the direction of protruding from the electromagnetic device (2), and as a result, the opening/closing plate (7) is urged in the direction of closing the air passage as will be described later. As shown in Figure 3, the electromagnetic device (2) is housed in the recess of the case (1), and inside the magnetic exterior are an electromagnetic coil (11), a permanent magnet (1, and an iron core (13)).
) is stored, the electromagnetic coil Ql) and the permanent magnet α surround the plunger (8), and the iron core i surrounds the plunger (8).
). Fixed shaft α protrudes sideways from the support plate fixed to case (1) using α4) & with a braking device.
A gear-shaped actuating member αη is supported rotatably at 0, and the tooth side that meshes with the teeth formed on the outer peripheral surface of this actuating member (1η) is formed at the end of the plunger (8) side of the lever (3). A gap is formed between the fixed shaft (16) and the actuating member (Iη), and this gap is filled with viscous oil that acts as a resistance substance over the entire circumference of the fixed bacteria. , the actuating member fin is rotatably held with respect to a fixed axis αe via an oil cup.This oil α9
is an actuating member (having a viscosity sufficient to provide sufficient resistance to rotation of 1η, and silicone grease is suitable as one of them.Frictional resistance between the actuating member (I) and the fixed shaft (16) In order to ensure this, in addition to silicone grease, an elastic material such as rubber may be interposed between the two as a resistance material.

As is clear from FIGS. 1 to 3, the braking device is connected to the lever (3) between the support portion (6) and the pusher (8).
Let me get involved? It is stored and held in a case (tl). For this reason, it exists within the range from the electromagnetic device (2) to the opening/closing plate (power), and it can be made smaller compared to the trap installed outside this range, and it is unnecessary when installed inside the refrigerator as described later. Since it does not occupy space inside the refrigerator, the space required to store items in the refrigerator can be reduced.

FIG. 7 shows an embodiment in which an electromagnetic damper device is installed inside a refrigerator. In this diagram, the electromagnetic damper device is located in the upper part of the refrigerator compartment (C).
It is covered with a cover that forms a cold air outlet (c). This figure will be explained in more detail. ■ is the refrigerator itself, which is divided into a freezer compartment C2 and a refrigerator compartment (c) by a partition wall (21), and the air is purified by a cooler (foundation) stored in a cold air passage in the partition wall (2J). The electric compressor (A) of the refrigeration system including the cooler (24) is operated by a thermostat that detects the temperature of the freezer compartment (24). and stop control. The electromagnetic damper device is provided so that the air passage □□□, which is circulated by the blower (c) to the refrigerator compartment (c), is opened and closed by an opening/closing plate +71 at its outlet. Until the temperature of the refrigerator compartment unit falls to a predetermined lower limit temperature, the plunger (8) is attracted and held by the permanent magnet α, and the opening/closing plate (7) opens the outlet of the air passage (c). When the temperature in the refrigerator compartment @ drops to a predetermined lower limit temperature, the temperature detection device operates and causes a unidirectional current to flow through the electromagnetic coil (tl) for a predetermined period of time to push the plunger (8) against the attractive force of the permanent magnet C121. In combination with the force of the spring (9), the plunger (8) protrudes largely to the left in FIG. 3. Therefore, the lever (3) rotates about the support part (6), and the opening/closing plate (7) closes the outlet of the air passage. This closed state is the electromagnetic coil (
11) is held by the force of the spring (9). After that, when the temperature of the refrigerator compartment (c) rises and reaches the upper limit temperature, the temperature detection device operates and the electromagnetic coil (11)
A current in the opposite direction to that described above is applied for a predetermined period of time to pull in the Pushinger (8) against the force of the spring (9). By this action, the lever (3) rotates about the support part (6), and the opening/closing plate (7) opens the outlet of the air passage □□□.The pusher (8) is also retracted, as shown in Fig. 3. Even if the current to the electromagnetic coil (11) stops, a permanent magnet (1 force magnetic path is formed by the plunger (8), the iron core (19, and the exterior αQ), and the plunger (8) ) is a spring (9
) Holds the retracted state against the force. In this manner, the refrigerator compartment (c) is maintained within a predetermined temperature range.

In the above-mentioned operation, when the lever (31) reciprocates with the support part (6) as a fulcrum, the opening/closing plate (7) of the lever (3)
) The actuating member Cl71 rotates around the fixed shaft (1) in response to the reciprocating movement of the tooth (lE9) provided at the opposite end of the lever (1).
3) moves much more slowly than in the case where the braking device I does not exist. For this reason, a long time is required for energizing the electromagnetic coil Ql). For this time, stable reciprocation of the lever (3) can be achieved even at about 200m5eC when there is no leakage in the brake device α, but in the case of the present invention, it is much longer than that, and it is better to energize for about several hundred milliseconds to one second. is safe. Although the opening/closing plate (7) actually opens or closes within this time, it is not so long that it becomes a problem.

As mentioned above, the sound of the plunger (8) colliding with the iron core α due to the relatively slow movement is also caused by the opening/closing plate (
7) colliding with the outlet portion of the air passage (8) can also be sufficiently reduced. Also, the tip of the plunger (8) and the iron core α&
You can almost eliminate the gap between the plunger (8
) is also increased, and the plunger (8) can be stably drawn in and held. Further, it is also possible to eliminate the need for rubber for absorbing the impact sound when the plunger (8) is retracted, as in the conventional case. Furthermore, as in the embodiment of the present invention, since the braking device I is provided corresponding to the lever (3) portion that is sufficiently far away from the supporting portion side, the rotation angle of the actuating member αD is increased by the operation of the lever (3). Therefore, sufficient braking can be obtained even if the frictional resistance between the actuating member (171 and the fixed shaft (16) is small).

In order to increase the resistance of the braking device α4), as shown in FIG. This can be achieved by providing the silicone oil also in the part, and by configuring it as shown in this figure, the silicone oil can be retained well.

In the above-mentioned embodiment, the case (1) as a holder for the electromagnetic device (2) is integrally molded, but it may also be constructed from a combination of multiple parts, or it may be formed integrally with the cover (2). Alternatively, a separate combination may be used as the holder.

(G) Effects of the Invention In the present invention, an intermediate portion is rotatably supported, an opening/closing plate for opening and closing an air passage is supported at one end of the support, and the other end of the support is connected to a plunger of an electromagnetic device. In the electromagnetic damper device, the electromagnetic damper device includes a lever that is closed, and a spring that biases the opening/closing plate in a direction to close the air passage. It is possible to sufficiently reduce the sound when the device is used, and when applied to equipment installed in the home such as a refrigerator, it is possible to reduce the source of unpleasant sound. Furthermore, the device of the present invention is extremely simple, and the attraction force of the electromagnetic device can be applied over a large range, so that the spring force can be increased to ensure sufficient closure of the air passage by the opening/closing plate. Furthermore, since the braking device is involved in the lever between the plunger and the lever support, the electromagnetic damper device can be made smaller, and even if it is incorporated into a refrigerator, the area occupied by it can be reduced.

[Brief explanation of the drawing]

1 to 7 show embodiments of the present invention, FIG. 1 is a perspective view of an electromagnetic damper device, FIG. 2 is a front view of the electromagnetic damper device, and FIG. 3 is an electromagnetic damper device. 4 is an exploded perspective view of the braking device section, FIG. 5 is a longitudinal sectional side view of the braking device section, and FIG. 6 is a longitudinal sectional side view showing another embodiment of the braking device. FIG. 7 is a longitudinal side view of a refrigerator to which an electromagnetic damper device is applied, FIG. 8 is an attractive force characteristic diagram of the electromagnetic device, and FIG. 9 is a longitudinal side view of a conventional electromagnetic device. Prisoner...electromagnetic damper device, (2)...electromagnetic device, (3)...lever, (6)...support part, (7
)...Opening/closing plate, (8)...Plunger, (9)
...Spring, (1e...Fixed shaft, CLη...Operating member. Applicant: Sanyo Electric Co., Ltd. and one other representative: Shizuo Sano, patent attorney Figure 6, Figure 7)

Claims (1)

[Claims] 1. A lever that rotatably supports an intermediate portion, supports an opening/closing plate for opening and closing an air passage at one end of the supporting part, and has the other end of the supporting part connected to a plunger of an electromagnetic device; and the opening/closing plate. An electromagnetic damper device including a spring that heats the air passage in a direction to close the air passage, the electromagnetic damper device having an actuation member interlocking with the lever, and a fixed shaft rotatably supporting the actuation member, the actuation member A braking device is provided on the electromagnetic device holder, and includes a resistive material interposed between the lever and the fixed shaft to slow down the reciprocating movement of the lever. An electromagnetic damper device for refrigerators.