JP3567283B2 - Electromagnetic device for automatic ice making equipment - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic device of an automatic ice making device used for separating ice in a water supply device or an ice tray from an ice tray in an automatic ice making device of a refrigerator.
[0002]
[Prior art]
In an automatic ice maker of a refrigerator, a valve provided in a water supply path from a water tank provided above the ice tray to the ice tray is opened by an electromagnetic device to supply a fixed amount of water to the ice tray, and the ice tray is made. In order to supply the ice to the ice storage container, part of the ice tray was warmed to make it easier to peel off, then the ice tray was turned over with an electromagnetic device to forcibly peel off ice that had not yet peeled off the ice tray. Electromagnetic devices are used for operations such as applying an impact to an ice tray with the electromagnetic device.
[0003]
Such an electromagnetic device must be small because it has to be housed in a narrow space at a predetermined position of the refrigerator, and each of these electromagnetic devices requires a long stroke. In addition, the operating force must be low and at the same time strong enough to separate the ice.
[0004]
Therefore, conventionally, various techniques have been proposed to make this electromagnetic device compact and powerful. For example, as shown in Japanese Utility Model Laid-Open No. 6-31110, an electromagnetic coil is provided in a hollow coil bobbin around which an electromagnetic coil is wound. Between the plunger tube made of non-magnetic material and the coil bobbin, a vertically divided cylindrical auxiliary magnetic pole is provided, and inside the plunger tube, a plunger made of a magnetic material and having an operating rod fixed to an end, and this plunger. By fixing the suction element made of a magnetic material with a gap and adjusting the position and shape of these members, the electromagnetic device is made small and powerful.
[0005]
In the electromagnetic device of the conventional automatic ice making device as described above, the plunger that slides inside is arranged in the plunger tube, so that it is located between the coil bobbin outside the plunger tube and the plunger inside the plunger tube. In this case, an air gap is generated in each of the gaps, and the magnetic resistance is increased. In particular, in the above-mentioned conventional device in which the electromagnetic device is made compact and powerful, an air gap is further generated due to the provision of a vertically divided cylindrical auxiliary magnetic pole between the plunger tube and the coil bobbin. Thus, although the operating characteristics are improved, there is a problem that the efficiency of the electromagnetic device is reduced in terms of magnetoresistance.
[0006]
Accordingly, an object of the present invention is to provide an electromagnetic device for an automatic ice making device in which the air gap in the electromagnetic device is reduced to reduce the magnetic reluctance, can be thin, can cope with a high load, and can increase the operating lift of the plunger. Aim.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention fixes a substantially cylindrical guide made of a magnetic material at the center of an outer box core, press-fits and fixes an inner periphery of a coil bobbin around which a coil is wound around an outer periphery of the guide, A plunger is slidably provided inside the guide, the length of the guide is set longer than the stroke of the plunger, buffer plates are provided on both sides of the flange at the end of the plunger, and the plunger slides through the outer case core. This is configured as an electromagnetic device of an automatic ice making device to which a moving rod is fixed.
[0008]
Since the present invention is configured as described above, when the coil is energized, the magnetic flux formed thereby is fixed by press-fitting the inner periphery of the coil bobbin around which the coil is wound and the guide, so that the air gap is provided between the two. And the guide made of a magnetic material is strongly excited. Further, a plunger made of a magnetic material is directly slidably provided inside the guide made of a magnetic material, and a plunger guide or the like is not used between the two. The plunger can be directly excited by the guide of the magnetic material without causing any resistance, and the electromagnetic device becomes a powerful automatic ice making device.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. In the electromagnetic device 1 of the automatic ice making device, an outer box 4 is formed by a first outer box 2 and a second outer box 3 made of a magnetic material, and a first opening 5 is formed in the center of the first outer box 2. A second opening 6 is formed in the center of the second outer box 3. In a second opening 6 formed in the second outer box 3, a step 8 formed at the outer peripheral end of a substantially cylindrical guide 7 made of a magnetic material is firmly fixed by welding or the like. Is press-fitted and fixed to a cylindrical inner peripheral surface 13 of a coil bobbin 12 on which a coil 11 is wound. The height of the coil bobbin 12 is set so as to match the height inside the outer box 4 composed of the first outer box 2 and the second outer box 3, and the end 14 of the guide 7 that is press-fitted into the coil bobbin is Is set to approximately half the height of the inside of the outer box 4.
[0010]
Inside the substantially cylindrical guide 7, a plunger 15 having an outer diameter set to be equal to the inner diameter of the guide 7 as much as possible, that is, to minimize the gap between them, is slidable. A flange 16 is formed at the end of the plunger 15, and the outer shape of the flange is sufficiently larger than the inner peripheral surface of the guide 7, and can slide with respect to the inner periphery of the coil bobbin 12. Set to size.
[0011]
A first buffer plate 18 made of an elastic material is provided on the end surface of the plunger, that is, one end surface 17 of the flange 16, and a second buffer plate 21 made of the elastic material is also provided on the other end surface 20 of the flange 16. ing. Thereby, when the plunger 15 is pulled into the guide 7 as shown in the figure, the second buffer plate 21 provided on the end face 20 of the flange 16 of the plunger 15 abuts on the end 14 of the guide 7. ing. When the plunger 15 projects from the guide 7, the first buffer plate 18 comes into contact with the inner surface of the first outer box 2. When the plunger 15 projects from the guide 7 as described above and the first buffer plate 18 comes into contact with the inner peripheral surface of the first outer box 2, the other end of the plunger does not fall out of the guide 7. The length of the guide 7 is set longer than the stroke of the plunger.
[0012]
A rod 22 is fixed to an end of the plunger 15, and the rod 22 protrudes slidably from the first opening 5 of the first outer box 2, and its tip or another member fixed to the rod automatically makes ice. Various members of the device can be driven.
[0013]
In the operation of the electromagnetic device of the automatic ice making apparatus configured as described above, when the coil 11 is not initially energized, the rod is pushed out by the weight of the plunger 15 and the rod 22 or by a spring (not shown) provided on the rod or the like. At this time, the first buffer plate 18 is in contact with the inner surface of the first outer box 2.
[0014]
When the coil 1 is energized from this state, the magnetic body is fixed to the outer case 4 and the second outer case 3 by magnetic lines of force formed by the coil, and the magnetic guide 7 is separated from the guide 7. A magnetic path is formed through the plunger 15. In this magnetic path, the outer diameter of the plunger 15 is set so that the gap between the plunger 15 and the inner circumference of the guide 7 is as small as possible, and the plunger 15 is slidably provided. Since no gap, that is, an air gap is generated in the first embodiment, an increase in magnetic resistance due to the air gap is prevented. Further, since a plunger guide or the like made of a non-magnetic material is not provided between the inner circumference of the guide and the outer circumference of the plunger 15, an air gap due to this is prevented.
[0015]
When the above-described magnetic path is formed by energizing the coil 1, positive and negative polarities are present on the opposing surface of the guide 7 and the plunger 15. It is drawn into the guide 7. This suction action is strong because the air gap in the magnetic path is extremely small as described above, and is an electromagnetic device for operating a valve in a supply path of water from a tank to an ice tray in an automatic ice making device, and for inverting an ice tray. The operation of an electromagnetic device, such as an electromagnetic device for giving an impact to drop ice from an ice tray, can be performed strongly and reliably.
[0016]
When the flange 16 finally comes into contact with the end portion 14 of the guide 7 due to the suction action of the strong plunger 15, the second buffer plate 21 provided on the flange 16 It is buffered by the elastic action and abuts to prevent impact noise. When the power supply to the coil 1 is stopped, the plunger 15 returns to the position where the plunger 15 projects from the guide 7 by the weight of the rod 22 or the plunger 15 or by a return spring (not shown), the flange 16 of the plunger 15 When the first buffer plate 18 comes into contact with the inside of the first outer box 2 first, it is possible to prevent the generation of an impact sound. Since the plunger guide has such a strong electromagnetic device and can cope with a high load, the plunger guide can be a thin electromagnetic device as a whole, and can be securely stored in a limited space of the refrigerator.
[0017]
【The invention's effect】
Since the present invention is configured as described above, the electromagnetic gap of the automatic ice making device which can reduce the air gap in the electromagnetic device to reduce the magnetic reluctance, can be thin and can cope with a high load, and can increase the operating lift of the plunger. An apparatus can be provided.
[Brief description of the drawings]
FIG. 1 is a sectional view of an electromagnetic device of an automatic ice making device according to an embodiment of the present invention.
[Explanation of symbols]
Reference Signs List 1 electromagnetic device 2 first outer box 3 second outer box 4 outer box 5 first opening 6 second opening 7 guide 8 step 10 outer peripheral surface 11 coil 12 coil bobbin 13 cylindrical inner peripheral surface 14 end 15 plunger 16 flange 17 End face 18 First buffer plate 20 End face 21 Second buffer plate 22 Rod

Claims (3)

A substantially cylindrical guide made of a magnetic material is fixed at the center of the outer box core, the inner periphery of a coil bobbin around which a coil is wound is pressed and fixed, and a plunger is slidably provided inside the guide. The length of the guide is set longer than the stroke of the plunger, buffer plates are provided on both sides of the flange at the end of the plunger, and the rod that slides through the outer box core is fixed to the plunger. Electromagnetic device for automatic ice making equipment. The electromagnetic device of an automatic ice making device according to claim 1, wherein the plunger is slidably provided with an outer diameter set so as to be as equal as possible to an inner diameter of the guide and so as to make a gap between the two as small as possible. . A flange is formed at an end portion of the plunger, and an outer shape of the flange is set to be sufficiently larger than an inner peripheral surface of the guide and slidable with respect to an inner periphery of the coil bobbin. Item 3. An electromagnetic device for an automatic ice making device according to Item 2.

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