KR100763382B1 - Ice-bank of Ice-maker equipped with ER clutch - Google Patents

Abstract

The present invention relates to an ice extraction device of an ice bank of an automatic ice maker, and provides an ice bank of an automatic ice maker that drives an ice extraction damper using an ER clutch filled with ER fluid.

To this end, the present invention comprises a cylindrical blade housing having one end open to enable the discharge of ice, the ice discharge port is formed; A movable blade rotatably installed in the blade housing; A fixed blade having one end connected to a drive shaft of the movable blade and one end fixedly supported by the blade housing to cut ice in correspondence with a cutting surface of the movable blade; A blowout damper hinged to the blade housing to open and close the ice outlet of the blade housing; A blowout damper hinge connecting the blowout damper to the blade housing; A restoring spring installed at one side of the ejection damper and acting an elastic force to move the ejection damper in a direction of closing the ice outlet; A blowout damper-side magnet, which is a permanent magnet installed in the blowout damper; A blade-side magnet which is installed at a predetermined angle spaced from the outermost radius of the movable blade so as to be rotatable ahead of the movable blade, and is a permanent magnet which acts as a repulsive magnet to push the ejection damper in the direction of opening the opening of the ice outlet; A piece of ice position sensor installed to detect when the blower damper is in a position to close the ice outlet; An angle ice position sensor installed to detect the ejection damper when the ejection damper is in a position to open the opening of the ice outlet to the maximum; An ER clutch comprising a cylindrical clutch body, an ER fluid filled in the clutch body, and a piston inserted into the clutch body and having one end connected to a blowout damper; And a clutch controller connected to the clutch main body and the piston to apply a voltage to the clutch, thereby providing an ice bank of the automatic ice maker using the ER clutch.

ER clutch, automatic ice maker

Description

Ice-bank of Ice Maker with ER Clutch {Ice-bank of Ice-maker equipped with ER clutch}

1 is a side view showing an ice bank and a dispenser of a conventional automatic ice maker.

FIG. 2 is a configuration diagram showing the behavior of the blowoff damper in a section along the line I-I in the ice bank shown in FIG.

3 is a configuration diagram of the technical apparatus of the present invention, corresponding to FIG.

<Description of Symbols for Main Parts of Drawings>

22. Transfer spring 22a. Blade drive shaft

41.Blade Housing 42.Movable Blade

43. Fixed Blade 51. Blowout Damper

52. Draw-out damper hinge 100. ER clutch

101. Clutch Body 102. Piston

103.ER fluid 110.clutch control unit

111. Ice cube position sensor 112. Ice cube position sensor

113. Hall sensor magnet 120. Restoring spring

131. Extraction damper side magnet 132. Blade side magnet

The present invention relates to an ice bank and an apparatus for extracting ice from an automatic ice maker, and more particularly, an ejection damper that enables the extraction of ice cubes or flake ice is provided in an electro-Rheological fluid or a Winslow fluid. An ice bank of an automatic ice maker using an ER clutch driven by an ER clutch filled with an ER fluid ') is provided.

Recently, an automatic ice maker is installed in a refrigerator, and various functions have been added for the user to conveniently use, such as a dispenser for allowing a user to eat ice or water extracted from the automatic ice maker from the outside of the refrigerator.

As is well known, an automatic ice maker is a device installed in a refrigerator to automatically perform a series of processes related to ice making without user's special operation, so that ice can be conveniently obtained.

The automatic ice maker is composed of an ice making unit for producing ice by receiving water largely, and an ice bank for accommodating and storing the produced ice, and the ice bank communicates with the ice chute to transfer the ice stored in the ice bank to an external dispenser. Discharge it.

At this time, a control panel is installed on the outer surface of the refrigerator door to allow the user to select a predetermined function of the refrigerator, and the user can select water, ice cubes or ice cubes in the dispenser.

Hereinafter, an example of an ice bank and an ice extraction device of a conventional automatic ice maker will be described in detail with reference to FIGS. 1 to 2 as follows.

FIG. 1 is a side view illustrating an ice bank and a dispenser of a conventional automatic ice maker, and FIG. 2 is a block diagram illustrating a cross section taken along the line I-I of the ice bank of FIG.

When the user selects ice cubes or ice cubes from a control panel (not shown) provided outside the refrigerator, the stored ice inside the ice-bank 10 is transferred and crushed into pieces of ice or discharged. It is discharged as it is and is discharged to the dispenser 1 through an ice chute 3 connected to the outside.

At this time, at the outlet portion where the ice chute 3 is connected to the outside, a blocking damper 2 is provided to block the inflow of outside air when ice is not discharged.

As shown in FIG. 1, the ice bank 10 transfers the ice stored in the bank basket 11 constituting the main body to crush the ice if necessary, and to crush the crushed ice or cube ice at one end. It is configured to discharge to the ice chute (3) through the formed ice outlet (12).

Hereinafter, the bank basket 11 will be described with the front surface facing the dispenser 1, that is, the surface facing the refrigerator door.

The bank basket 11 is formed so that the upper portion is opened to accommodate the ice made in the ice making unit (not shown) of the automatic ice maker, and one end portion is opened to discharge the ice to the ice chute 3 to a predetermined portion in front of the bank basket 11. Is formed.

The transfer spring 22 which is horizontally installed in the front and rear direction across the bank basket 11 to transfer ice is rotatably installed, and the transfer motor 21 which drives the transfer spring 22 is rearward. Combined.

A helix 32 is installed in front of the transfer spring 22 to allow a uniform amount of ice to be transferred, and a helix housing 31 that protects the helix 32 and serves as an ice transfer path. Is installed.

At this time, the portion of the rear of the helix housing 31 in the transfer spring 22 is formed of a threaded spiral portion, the blade drive shaft 22a extending linearly in the spiral portion of the transfer spring 22 is the helix housing It penetrates through 31 and extends to the front surface of the bank basket 11.

In front of the helix housing 31 is a cylindrical blade housing 41 is formed in communication with the ice chute 3, the one end is opened to form an ice outlet 12 so as to discharge the ice.

One end is connected to the blade drive shaft 22a in the blade housing 41, and a fixed blade 43 is installed so that the other end is fixed to and supported by the blade housing 41 across the blade housing 41. do.

The movable blade 42 coupled to the blade drive shaft 22a and rotatably installed, cuts ice while the cutting surface of the movable blade 42 rotates and engages with the cutting surface of the fixed blade 43. .

At this time, a plurality of the movable blade 42 and the fixed blade 43 are installed on the blade drive shaft 22a spaced apart a predetermined interval, respectively, the movable blade 42 is installed between the fixed blade 43.

A blowout damper 51 allowing opening and closing of the ice outlet 12 is hinged to an inner end of the blade housing 41 by a blowout damper hinge 52.

When the ejection damper 51 is in a position to close the ice outlet 12, the end of the ejection damper 51 does not touch the fixed blade 43 and does not interfere with the rotation of the movable blade 42. It is formed into a curved plate.

Therefore, the ejection damper 51 closes only the portion of the ice outlet 12 except for the lower end of the fixed blade 43.

In addition, the ejection damper 51 has the upper limit of the position where the ejection damper hinge 52 is in contact with the fixed blade 43, and the lower limit of the position where the ejection damper 51 is in contact with the blade housing 41. .

Looking at the operation in which the ice in the ice bank 10 is configured as described above is taken out ice cubes and pieces of ice as follows.

Hereinafter, since the ice is crushed and discharged into crushed ice when the ejection damper 51 closes the ice outlet 12, the position of the ejection damper 51 at this time is referred to as the crushed ice position, and the ejection damper 51 The position of the blow-out damper 51 in which the ice discharge port 12 is opened to the maximum to discharge ice cubes is referred to as the ice cube position.

First, when power is applied to the transfer motor 21, the transfer spring 22 is rotated to transfer the ice in the bank basket 11 to the helix housing 31, the inside of the helix housing 31 Ice of Helix 31 is pushed in a uniform amount by the blade housing (41).

As shown in FIG. 2, when the user selects the crushed ice, the ejection damper 51 closes the ice outlet 12 at the crushed ice position. Since the ice rotates together with the movable blade 42, the ice is interlocked between the fixed blade 43 and the cutting surface of the movable blade 42, and the crushed ice is crushed by the ice outlet through the lower end of the fixed blade 43. 12) is discharged.

In addition, when the user selects the ice cube, the blow-out damper 51 behaves to the ice cube position where the ice discharge port 12 is opened as much as possible, and thus the transferred ice does not rotate together with the movable blade 42. As it is discharged as it is through the open portion of the ice outlet 12, ice cubes can be used.

At this time, in the conventional ice bank 10, the take-out damper 51 was driven by the solenoid (50) using the solenoid (50) to move the flake ice position and the angular ice position.

As described above, the ice bank of the conventional automatic ice maker that drives the blower damper with the solenoid has the following problems.

First, the ice bank of the conventional automatic ice maker has a problem in that the structure is complicated because it controls the opening degree of the ice outlet by driving the extraction damper using a separate solenoid.

Second, since the space in which the solenoid is installed and the space in which the wires connected to the solenoid are accommodated must be formed separately, there is a problem in that the use area of the refrigerator is reduced.

Third, since the blowout damper must be driven using the solenoid, not only power consumption is increased but also the temperature of the freezer compartment is increased by the heat generated when the solenoid is operated. Thus, power consumption for maintaining the freezer compartment within a certain temperature range is increased. There is this.

The present invention has been made to solve the above problems, the object of the present invention is to provide an ice bank of an automatic ice maker using an ER clutch to control the opening degree of the ice outlet by driving the blowout damper with the ER clutch using the ER fluid. have.

In order to achieve the above object, the present invention, the one end is opened to enable the discharge of ice cylindrical housing formed with an ice outlet; A movable blade rotatably installed inside the blade housing; A fixed blade having one end connected to a drive shaft of the movable blade and one end fixedly supported by the blade housing to cut ice in correspondence with a cutting surface of the movable blade; A blowout damper hinged to the blade housing to open and close an ice outlet of the blade housing; A blowout damper hinge connecting the blowout damper to the blade housing; A restoring spring installed at one side of the ejection damper and acting an elastic force to move the ejection damper in a direction of closing the ice outlet; A blowout damper-side magnet, which is a permanent magnet installed in the blowout damper; A blade-side magnet which is installed at a predetermined angle spaced from the outermost radius of the movable blade so as to be rotatable before the movable blade, and is a permanent magnet which acts to repulse the ejection damper to be pushed in the direction of opening the opening of the ice outlet; A piece of ice location sensor installed to detect when the blowout damper is in a position to close the ice outlet; An angular ice position sensor installed to detect the ejection damper when the ejection damper is in a position to open the opening of the ice outlet to the maximum; An ER clutch comprising a cylindrical clutch body, an ER fluid filled in the clutch body, and a piston inserted into the clutch body and having one end connected to a blowout damper; And a clutch control unit configured to apply an voltage to the clutch by connecting electrodes to the clutch body and the piston, respectively, wherein a piece ice selection signal is applied to the clutch control unit, and the take-off damper is at the piece ice position. When detected by the position sensor, the clutch control unit applies a voltage to the ER clutch and fixes the take-off damper to the sculpted ice position, an angle ice selection signal is applied to the clutch control unit, and the blade-side magnet is close to the take-off damper Is pushed to the angular ice position and is detected by the angular ice position sensor, the clutch control unit applies a voltage to the ER clutch and fixes the take-off damper to the angular ice position, the ice bank of the automatic ice maker using the ER clutch. To provide.

In addition, in the ice bank of the automatic ice maker using the ER clutch, the blade-side magnet is characterized in that a plurality of at least the number of movable blades are installed.

The repulsive force between the blade-side magnet and the take-out damper-side magnet is equal to or greater than the initial elastic force of the restoring spring and less than or equal to the elastic force at the maximum displacement.

The piece ice position sensor and each ice position sensor is characterized in that the Hall sensor (Hall sensor).

In the ice bank of the automatic ice maker using the ER clutch, the restoring spring is characterized in that the torsion spring is installed on the take-out damper hinge.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a configuration diagram showing the behavior of the blowout damper to which the ER clutch according to an embodiment of the present invention is applied.

On the other hand, prior to explaining the embodiment of the present invention, since the configuration and operation of the ice chute and the dispenser in the automatic ice maker is the same as described in the prior art, the description thereof is omitted, and also the same parts as the conventional components of the ice bank The same name and the same code | symbol are attached | subjected about the, and description is abbreviate | omitted.

In addition, with reference to Figs. 1 and 2, the same components and components as those of the present invention will be given the same names and the same reference numerals. Hereinafter, the ice extraction apparatus of the ice bank, which is a feature of the present invention, will be described. Let's do it.

As shown in FIG. 3, the ER clutch 100 according to the exemplary embodiment of the present invention has a cylindrical clutch main body 101 and one end thereof exposed to the outside of the clutch main body 101 so as to take out the damper 51. Piston 102 is inserted into the clutch body 101 to be connected to the) and ER fluid 103 is filled in the clutch body 101.

One end of the clutch body 101 is fixed to the ER clutch 100, and one side of the piston 102 is connected to the take-out damper 51, so that the take-off damper 51 is compressed at the angular ice position. When the crushed ice is in position, the reciprocating motion is maximized.

An electrode is connected to the clutch main body 101 and the piston 102, respectively, and a clutch control unit 110 for applying a voltage to the ER clutch 100 is provided.

For reference, an electro-rheological fluid (Electro-heheological fluid or Winslow fluid: ER fluid), generally known as intelligent fluid, is a general term for fluids whose mechanical properties change according to the intensity of an applied electric field. It is divided into a dispersed ER fluid (or particle system) of a colloidal solution in which strong conductive fine particles are dispersed, and a liquid crystal ER fluid (uniform system) using a low molecular or polymer liquid crystal as an ER fluid.

Conventional fluids have only one viscosity at the reference temperature, whereas ER fluids can have multiple viscosities depending on the strength of the applied electric field when an electric field is applied from the outside. It is a fluid whose properties change quickly within a short time of several seconds and whose change is reversible.

At this time, the ER fluid behaves as a fluid having little viscosity before the electric field is applied, but behaves like a solid when the electric field is applied. At this time, the ER fluid starts to flow again when the stress applied to the ER fluid exceeds the predetermined stress.

Therefore, when no voltage is applied to the ER clutch 100, since the ER fluid 103 filled in the clutch body 101 has a low viscosity and no resistance is generated, the piston 102 may take out the damper 51. According to the behavior of the) the clutch body 101 is free to reciprocate.

In addition, when a voltage is applied to the ER clutch 100, the viscosity of the ER fluid 103 is changed to generate resistance, so that the piston 102 is fixed at a position inside the clutch body 101. The blowout damper 51 is fixed.

The extraction damper hinge 52 is provided with a restoring spring 120, which is a torsion spring, and applies a restoring force in a direction in which the ejection damper 51 behaves in a sculpted ice position to close the ice outlet 12. do.

At this time, the restoring spring 120, in addition to the torsion spring, is connected to one side of the take-off damper 51 and fixed to the inner surface of the blade housing 41, the elastic force to restore the take-off damper 51 to the crushed ice position It would also be possible to install an tension spring to act.

An angular ice position sensor 111 and a piece of ice position sensor 112, which are hall sensors for detecting the position of the blowout damper 51, are installed, and the hall sensor magnet 113 that is a pair of the hall sensors is provided. It is installed on one side of the free end of the blowout damper 51.

The angular ice position sensor 111 is installed to detect when the take-off damper 51 is in the angular ice position, the piece ice position detection sensor 112 is the take-off damper 51 in the crushed ice position It is installed to detect when there is.

The angle ice position sensor 111 and the piece ice position sensor 112 may also be installed to detect the position of the blowout damper 51 by installing other sensors other than the hall sensor.

On one side of the blowout damper 51, a blowout damper-side magnet 131, which is a permanent magnet, is installed so that one pole (for example, N pole) faces the movable blade 42 side.

The blade-side magnet is disposed on the outermost side of the rotation radius of the movable blade 42 so that the ejection damper-side magnet 131 and the N pole face each other and exert a repulsive force on the ejection damper 51 to push it to the angular ice position. 132 is installed.

The blade-side magnet 132 is coupled to the blade drive shaft 22a, and rotates ahead of the movable blade 42 by being spaced a predetermined angle in the rotational direction of the movable blade 42.

That is, when the movable blade 42 is close to the blowout damper 51, the blade-side magnet 132 is closer to the blowout damper 51 than the movable blade 42, so that the blowout damper 51 is crushed ice. It will be pushed from the position to the angular ice position.

At this time, the blade-side magnet 132 is a rod having a length of about the rotation radius of the movable blade 42 is coupled to the blade drive shaft 22a, the permanent magnet is coupled to the free end side of the rod portion Can be formed.

In addition, it may be formed in the form of disposing a permanent magnet on the outer circumferential side spaced apart from the movable blade 42 by a predetermined angle in the disk rotating with the movable blade 42.

In addition, it is understood that the blade-side magnet 132 can be manufactured in various forms that can exert a repulsive force close to the ejection damper 51 in advance of the movable blade 42.

The number of the blade-side magnets 132 should be at least as large as the number of the movable blades 42 because the number of the movable dampers 51 should be able to push the ejection damper 51 as the movable blades 42 approach. It is easily understood that it is also possible to install as many as multiples of the number of movable blades 42.

On the other hand, since the repulsive force acting between the take-out damper-side magnet 131 and the blade-side magnet 132 must push the take-off damper 51 to the angular ice position, the repulsive force between the two permanent magnets is restored spring 120 Should be greater than the initial elastic force of.

Here, the initial elastic force of the restoring spring 120 refers to the elastic force acting on the restoring spring 120 when the take-off damper 51 is in the piece ice position.

In addition, when the ejection damper 51 is at the angular ice position, the maximum restoring force acting on the restoring spring 120 is greater than the repulsive force acting between the ejection damper side magnet 131 and the blade side magnet 132. The blower damper 51 is moved to a piece of ice.

That is, the repulsive force acting between the two permanent magnets is designed and installed to act as the size of more than the initial elastic force, the maximum restoring force of the restoring spring 120.

Therefore, when the movable blade 42 rotates n times, the extraction damper 51 reciprocates m (m> = n) times between the crushed ice position and the angular ice position.

Looking at the ice extraction operation of the ice bank of the automatic ice maker using the ER clutch according to the present invention configured as described above are as follows.

First, when the user selects the crushed ice through a control panel (not shown) outside the refrigerator, when the take-out damper 51 is detected by the crushed ice position sensor 112 at the crushed ice position, the clutch controller 110 A voltage is applied to the ER clutch 100 at, and the take-off damper 51 is fixed at the crushed ice position.
When a voltage is applied to the ER clutch 100, a change in the viscosity of the ER fluid 103 occurs as the voltage applied value rises. Such a change in viscosity causes the voltage to be changed and applied so as to have a corresponding viscosity at which the behavior of the blowout damper 51 can be fixed. Accordingly, when a voltage is applied to the ER clutch 100, the ER fluid 103 has a viscosity value capable of fixing the position of the piston 102 so that the position of the blowout damper 51 can be easily fixed.
At this time, even if the ejection damper 51 is pushed to the angular ice position by the blade-side magnet 132, since the voltage is not applied to the ER clutch 100 by the angular ice position sensor 111, the ejection damper Since 51 is restored to the crushed ice position by the restoring spring 52, it is detected by the crushed ice position sensor 112, the voltage is applied to the ER clutch 100 and is fixed at the crushed ice position.

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Accordingly, the ice rotates together with the movable blade 42 to be crushed by being engaged between the fixed blade 43 and the cut surface of the movable blade 42, and the crushed ice is swept through the lower end of the fixed blade 43. 12) is discharged.

On the other hand, when the user selects ice cubes, since the ER clutch 100 is not operated by the piece ice position sensor 112, when the blade-side magnet 132 is close, the take-off damper 51 is ice cubes It is pushed to a position, and detected by the angle ice position sensor 111, the take-out damper 51 is fixed at the angle ice position.

Therefore, the conveyed ice does not rotate with the movable blade 42, but is discharged as it is through the open ice outlet 12, so that ice cubes can be used.

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The ice bank of the automatic ice maker using the ER clutch according to the present invention configured as described above is not limited by the embodiments and drawings disclosed herein, and various skilled artisans within the scope without departing from the spirit of the invention. Of course, it is possible to modify and change the branch form.

As described above, the ice bank of the automatic ice maker using the ER clutch according to the present invention has the following effects.

First, since the ER clutch can be manufactured in a small size, and also the position sensing sensor, the restoring spring, and the magnet of the ejection damper can be made small, the space efficiency of the use area is increased by taking up a small space in the ice bank.

Second, since the ER clutch is installed in the blowout damper, it is possible to implement a simple and simple structure.

Third, the drive of the blowout damper can be precisely controlled due to the fast response characteristic of the ER fluid.

Claims (6)

A cylindrical blade housing having an open end at one end thereof to enable ice discharge; A movable blade rotatably installed inside the blade housing; A fixed blade having one end connected to a drive shaft of the movable blade and one end fixedly supported by the blade housing to cut ice in correspondence with a cutting surface of the movable blade; A blowout damper hinged to the blade housing to open and close an ice outlet of the blade housing; A blowout damper hinge connecting the blowout damper to the blade housing; A restoring spring installed at one side of the ejection damper and acting an elastic force to move the ejection damper in a direction of closing the ice outlet; A blowout damper-side magnet, which is a permanent magnet installed in the blowout damper; A blade-side magnet which is installed at a predetermined angle spaced from the outermost radius of the movable blade so as to be rotatable before the movable blade, and is a permanent magnet which acts to repulse the ejection damper to be pushed in the direction of opening the opening of the ice outlet; A piece of ice location sensor installed to detect when the blowout damper is in a position to close the ice outlet; An angular ice position sensor installed to detect the ejection damper when the ejection damper is in a position to open the opening of the ice outlet to the maximum; An ER clutch comprising a cylindrical clutch body, an ER fluid filled in the clutch body, and a piston inserted into the clutch body and having one end connected to a blowout damper; And, A clutch control unit configured to apply an electric voltage to the clutch by connecting electrodes to the clutch body and the piston, respectively; When the piece ice selection signal is applied to the clutch control unit and the extraction damper is sensed by the piece ice position detection sensor at the piece ice position, the clutch control unit applies a voltage to the ER clutch and fixes the take out damper to the piece ice position. , When the ice selection signal is applied to the clutch control unit and the blade-side magnet is in close proximity and the ejection damper is pushed to the angular ice position and sensed by the angular ice position sensor, the clutch control unit applies a voltage to the ER clutch and the take-out An ice bank of an automatic ice maker using an ER clutch, characterized in that the damper is fixed at the angular ice position. The method of claim 1, The blade-side magnet is at least the number of movable blades, characterized in that the ice bank of the automatic ice maker using an ER clutch. The method of claim 1, The ice bank of the automatic ice maker using the ER clutch, wherein the repulsive force between the blade magnet and the blowout damper magnet is equal to or greater than the initial elastic force of the restoring spring and less than or equal to the elastic force at the maximum displacement. The method of claim 1, The ice cube position detection sensor and each ice position detection sensor is an ice bank of an automatic ice maker using an ER clutch, characterized in that the hall sensor. The method of claim 1, The restoring spring is an ice bank of an automatic ice maker using an ER clutch, characterized in that the torsion spring is installed in the take-out damper hinge. A cylindrical blade housing having an open end at one end thereof to enable ice discharge; A movable blade rotatably installed inside the blade housing; A fixed blade having one end connected to a drive shaft of the movable blade and one end fixedly supported by the blade housing to cut ice in correspondence with a cutting surface of the movable blade; A blowout damper hinged to the blade housing to open and close an ice outlet of the blade housing; A blowout damper hinge connecting the blowout damper to the blade housing; A restoring spring installed at one side of the ejection damper and acting an elastic force to move the ejection damper in a direction of closing the ice outlet; A blowout damper-side magnet, which is a permanent magnet installed in the blowout damper; A blade-side magnet which is installed at a predetermined angle spaced from the outermost radius of the movable blade so as to be rotatable before the movable blade, and is a permanent magnet which acts to repulse the ejection damper to be pushed in the direction of opening the opening of the ice outlet; A piece of ice location sensor installed to detect when the blowout damper is in a position to close the ice outlet; An angular ice position sensor installed to detect the ejection damper when the ejection damper is in a position to open the opening of the ice outlet to the maximum; An ER clutch comprising a cylindrical clutch body, an ER fluid filled in the clutch body, and a piston inserted into the clutch body and having one end connected to a blowout damper; And, A clutch control unit configured to apply an electric voltage to the clutch by connecting electrodes to the clutch body and the piston, respectively; When the piece ice selection signal is applied to the clutch control unit and the extraction damper is sensed by the piece ice position detection sensor at the piece ice position, the clutch control unit applies a voltage to the ER clutch and fixes the take out damper to the piece ice position. , When the ice selection signal is applied to the clutch control unit and the blade-side magnet is in close proximity and the ejection damper is pushed to the angular ice position and sensed by the angular ice position sensor, the clutch control unit applies a voltage to the ER clutch and takes out the ejection damper. A refrigerator equipped with an ice bank of an automatic ice maker using an ER clutch, characterized in that the damper is fixed at a angular ice position.

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