KR101675418B1 - Electric damper for ventilator - Google Patents

Electric damper for ventilator Download PDF

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Publication number
KR101675418B1
KR101675418B1 KR1020150048376A KR20150048376A KR101675418B1 KR 101675418 B1 KR101675418 B1 KR 101675418B1 KR 1020150048376 A KR1020150048376 A KR 1020150048376A KR 20150048376 A KR20150048376 A KR 20150048376A KR 101675418 B1 KR101675418 B1 KR 101675418B1
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KR
South Korea
Prior art keywords
shutter
rotation
shaft
optical sensor
communication hole
Prior art date
Application number
KR1020150048376A
Other languages
Korean (ko)
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KR20160119557A (en
Inventor
김정환
배진만
Original Assignee
주식회사 힘펠
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Priority to KR1020150048376A priority Critical patent/KR101675418B1/en
Publication of KR20160119557A publication Critical patent/KR20160119557A/en
Application granted granted Critical
Publication of KR101675418B1 publication Critical patent/KR101675418B1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
    • F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/0001—Control or safety arrangements for ventilation
    • F24F11/0078—
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
    • F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
    • F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
    • F24F13/1426—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre characterised by actuating means

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air-Flow Control Members (AREA)

Abstract

The present invention relates to an electric damper for a fan, and more particularly to an electric damper for a fan that can more accurately and quickly ascertain whether an air flow passage, that is, a shutter for opening and closing a communication path,
The electric damper for a ventilator according to the present invention comprises: a case having a communicating hole with both ends opened therein; A shutter disposed inside the communication hole and opening and closing the communication hole by rotation; A motor for rotating the shutter; An optical sensor for sensing a rotation angle of the shutter; And a controller for determining the open / close state of the communication hole according to the rotation angle of the shutter sensed by the optical sensor, and controlling the motor.

Description

[0001] Electric damper for ventilator [0002]

The present invention relates to an electric damper for a fan, and more particularly to an electric damper for a fan that can more accurately and quickly ascertain whether an air flow passage, that is, a shutter for opening and closing a communication path,

The ventilator is installed in a room of a building, for example, a bathroom or a bathroom, or on a ceiling, forcibly sucking the air in the room and discharging the air to the outside of the building through a duct, thereby purifying the room air and discharging the smell .

The ventilator has an air inlet opening toward the indoor and an air outlet opening toward the outdoor. An exhaust duct is connected to the air outlet, and the exhaust duct is generally embedded in the ceiling.

When the ventilator is not driven, the air flow path is closed. When the ventilator performs the venting operation, the ventilator opens the air flow path to block the interlayer noise and the backflow airflow It plays a role.

Such a damper can be divided into a general damper and an electric damper. In the normal damper, a disk-shaped shutter is installed inside the air outlet of the ventilator. Normally, the discharge port is closed by gravity. When the ventilator is driven, Thereby opening the discharge port.

On the other hand, unlike a general damper, an electric damper is separately provided on an exhaust duct, and by controlling a shaft rotation operation of a disk-shaped shutter installed in an exhaust duct by using a drive motor or an electromagnet, etc., .

As described above, the electric damper that mechanically opens and closes the exhaust duct by using the power supply can guarantee the excellent airtightness and the high exhaust efficiency as compared with the general damper.

Such a conventional electric damper uses a limit switch or the like in order to check whether the shutter is opened or closed. However, the limit switch has a high possibility of malfunction due to frequent troubles and low accuracy.

In addition, the conventional electric damper has a disadvantage in that assembling and productivity are deteriorated and the cost is increased due to an increase in the number of parts.

In addition, when a screw or the like is used to connect the duct and the electric damper, the above disadvantages are generated.

Korean Utility Model Registration No. 20-0462274 Korean Utility Model Publication No. 20-2012-0005464

SUMMARY OF THE INVENTION The present invention provides an electric damper for a fan that can accurately and quickly grasp whether a shutter is open or closed by using an optical sensor and can easily assemble and install an electric damper It has its purpose.

According to an aspect of the present invention, there is provided an electric damper for a fan according to the present invention, comprising: a case having a communicating hole formed therein at both ends thereof; A shutter disposed inside the communication hole and opening and closing the communication hole by rotation; A motor for rotating the shutter; An optical sensor for sensing a rotation angle of the shutter; And a controller for determining the open / close state of the communication hole according to the rotation angle of the shutter sensed by the optical sensor, and controlling the motor.

The shutter is mounted with a rotation center shaft, and the motor is connected to one end of the rotation center axis to rotate the rotation center axis, and the optical sensor senses the rotation angle of the rotation center axis.

And a rotation bar coupled to one end of the rotation center shaft and rotating together with the rotation center axis, wherein the optical sensor senses rotation of the rotation bar according to rotation of the rotation center axis.

Wherein a first chamfered portion is formed on an outer circumferential surface of the rotation center shaft, a through hole through which the rotation center shaft passes is formed in the rotation bar, a second chamfered portion facing the first surface mounting portion is formed in the through hole, The rotation center axis and the rotation bar are rotated together by the first face mounting portion and the second face mounting portion.

A wing protrusion is formed on an outer circumferential surface of the rotating bar, and the optical sensor senses rotation of the wing protrusion.

Wherein the optical sensor comprises a first optical sensor and a second optical sensor disposed at an angle of 90 degrees and the wing protrusion is composed of a first wing protrusion and a second wing protrusion arranged at an angle of 180 degrees, And determines that the shutter is closed when the first photosensor senses the first wing projection and determines that the shutter is open when the second photosensor senses the second wing projection.

The rotation center shaft includes: a first shaft coupled to an upper portion of the shutter and rotatably inserted into the case; And a second shaft coupled to a lower portion of the shutter and rotatably inserted into the case, wherein a mounting hole for inserting the first shaft is formed on an upper portion of the shutter, and a first chamfered portion is formed on an outer circumferential surface of the first shaft, And a third chamfered portion facing the first chamfered portion is formed in the mounting hole, and the first centroid and the third chamfered portion rotate the rotation center shaft and the shutter together.

The case includes: a housing having the communication hole with both ends thereof opened therein, the housing including the motor and the optical sensor; At least two first latching portions protruding from the housing, and a second latching portion formed in the cover for hooking the first latching portion is formed in the cover do.

Wherein the second latching part is formed such that one end thereof is protruded from the inner surface of the cover and the other end is bent downwardly to be spaced apart from the inner surface of the cover, And the first engaging portion is formed with a locking protrusion protruding in the other one direction of the second locking portion and the other end of the second locking portion is formed with a locking groove into which the locking protrusion is inserted.

A fixing protrusion is formed on an inner circumferential surface of one end of the communication hole into which the duct is inserted. The coupling protrusion formed on the outer circumferential surface of the duct while the duct is inserted into one end of the communication hole is engaged with the fixing jaw, do.

At least two or more moving grooves are formed in the fixing jaw in the insertion direction of the duct, and the coupling protrusion of the duct is inserted into one end of the communication hole along the moving groove.

According to the electric damper for a fan according to the present invention as described above, the following effects can be obtained.

It is possible to accurately and quickly grasp whether the shutter is opened or closed as compared with the conventional limit switch.

Further, the overall assembly and installation of the electric damper is facilitated, thereby improving productivity and workability, and minimizing the use of screws or the like, thereby achieving cost reduction effects.

1 is a perspective view of an electric damper for a fan according to an embodiment of the present invention,
2 is an exploded perspective view showing a one-way electric damper for a fan according to an embodiment of the present invention,
FIG. 3 is an exploded perspective view of the electric damper for a fan according to the embodiment of the present invention,
Fig. 4 is a sectional view taken along line AA of Fig. 1,
Fig. 5 is a sectional view taken along the line BB in Fig. 1,
6 is a perspective view illustrating a state where a shutter, a rotation center shaft, and a rotation bar are combined according to an embodiment of the present invention,
FIG. 7 is an exploded perspective view of FIG. 6,
8 is a plan view showing the arrangement of a rotation center axis and a photosensor by rotation of a shutter according to an embodiment of the present invention,
9 is a process diagram illustrating a process of coupling a duct to an electric damper for a fan according to an embodiment of the present invention.

1 to 9, a motor damper for a fan according to the present invention includes a case 10, a shutter 20, a rotation center shaft 30, a motor 40, an optical sensor 50, And a control unit (not shown).

The case 10 forms an outer appearance of the electric damper. In this embodiment, the case 10 includes a housing 11 and a cover 16.

The case (10) has a communication hole (12) in which both ends are opened.

The motor 40, the optical sensor 50, a control unit, and the like are mounted on the upper portion of the case 10.

The cover 16 is coupled to the housing 11 while covering the motor 40, the optical sensor 50, the control unit, and the like.

At least two first locking portions 15 protrude from the housing 11 and a second locking portion 17 is formed in the cover 16 to hook the first locking portions 15 do.

In the present embodiment, the second latching part 17 is formed such that one end thereof protrudes from the inner surface of the cover 16, and the other end thereof is bent downwardly to be spaced apart from the inner surface of the cover 16.

The first engaging portion 15 is inserted between the inner surface of the cover 16 spaced apart as shown in FIG. 4 and the other end of the second engaging portion 17.

A locking protrusion 15a protrudes from the first locking portion 15 in the other direction of the second locking portion 17 and the locking protrusion 15a is inserted into the other end of the second locking portion 17. [ And an engaging groove 17a is formed.

When the cover 16 is inserted in the direction of the case 10, the first engaging part 15 is inserted between the inner side of the cover 16 and the second engaging part 17, And the other end of the second latching portion 17 is extended in a direction away from the inner side of the cover 16 by the latching jaw 15a so that the latching jaw 15a is inserted into the latching groove 17a, The other end of the second latching part 17 is returned to the original position.

With the above structure, the cover 16 can be easily assembled to the case 10 without tightening the screws.

The first engaging part 15 and the second engaging part 17 may be formed in the opposite manner to that of the present embodiment or may be provided by changing their positions.

The engaging groove 17a may be formed on the inner surface of the cover 16. The thickness of the cover 16 may be too thin to reduce the durability of the cover 16. As a result, 17 are formed separately and the latching grooves 17a are formed therein.

The shutter 20 is disposed inside the communication hole 12 and opens and closes the communication hole 12 by rotation.

The motor (40) is connected to the shutter (20) to rotate the shutter (20).

The motor 40 may be a stepping motor to precisely control the angle of rotation.

The rotation center shaft 30 is mounted on the shutter 20 and the motor 40 is connected to one end of the rotation center shaft 30 to rotate the rotation center shaft 30.

5 to 7, the rotation center axis 30 may be disposed in a direction intersecting the center of the shutter 20. However, in the present embodiment, 1 shaft 31 and the second shaft 33 as shown in Fig.

The first shaft 31 is coupled to the upper portion of the shutter 20 and is rotatably inserted into the housing 11 as shown in FIG.

The second shaft 33 is coupled to the lower portion of the shutter 20 and is rotatably inserted into the housing 11 as shown in FIG.

7, a mounting hole 21 into which the first shaft 31 is inserted is formed on the upper portion of the shutter 20, and a first surface mounting portion 21 is formed on the outer circumferential surface of the first shaft 31, And a third face mounting portion 22 facing the first face mounting portion 32 is formed in the mounting hole 21. [

Therefore, when the mounting hole 21 is inserted into the other end of the first shaft 31, the shutter 20 is rotated by the first face mounting portion 32 and the third face mounting portion 22, And rotates together with the shaft 30, i.e., the first shaft 31.

One end of the first shaft 31 is connected to the motor 40 and rotates.

At this time, the first shaft 31 may be a rotation axis of the motor 40.

The second shaft 33 may be formed separately from the shutter 20, or may be integrated with the shutter 20.

The optical sensor 50 detects the rotation angle of the shutter 20.

3, the optical sensor 50 may be mounted at a different position as the case may be, and ultimately the optical sensor 50 may be mounted on the substrate 55. In this case, It is only necessary to be able to detect the rotation angle.

In the present embodiment, the optical sensor 50 detects the rotation angle of the rotation center shaft 30.

To this end, a rotation bar 35 is coupled to the rotation shaft 30 in detail around one end of the first shaft 31, as shown in Figs. 6 and 7.

The rotation bar 35 rotates together with the first shaft 31 and the optical sensor 50 senses the rotation bar 35 according to the rotation of the first shaft 31, The rotation angle of the shaft 30 and the shutter 20 are sensed.

A through hole 36 through which the first shaft 31 passes is formed in the rotating bar 35. The first face mounting portion 32 of the first shaft 31 and the first face mounting portion 32 of the first shaft 31 are formed in the through hole 36, And a second side face mounting portion 37 is formed.

The first shaft 31 and the rotary bar 35 are rotated together by the first faceplate 32 and the second faceplate 37.

A wing protrusion 38 protrudes from the outer circumferential surface of the rotary bar 35 so that the optical sensor 50 senses the rotation of the wing protrusion 38.

The optical sensor 50 includes a first optical sensor 51 and a second optical sensor 52 arranged at an angle of 90 degrees and the wing protrusion 38 is arranged at an angle of 180 degrees The first wing protrusion 38a and the second wing protrusion 38b.

The control unit determines whether the communication hole 12 is opened or closed according to the rotation angle of the shutter 20 sensed by the optical sensor 50 and controls whether the motor 40 is operated or not.

8, when the first light sensor 51 senses the first wing protrusion 38a, the control unit determines that the shutter 20 is closed, When the second optical sensor 52 senses the second wing protrusion 38b, it is determined that the shutter 20 is open.

The first light sensor 51 and the second light sensor 52 are arranged at intervals of 90 degrees and the first wing protrusion 38a and the second wing protrusion 38b are arranged at intervals of 180 degrees This is possible.

By detecting the rotation angle of the shutter 20 using the optical sensor 50 as in the present invention, it is possible to reduce the failure rate compared to the case where the limit switch is conventionally used and to check whether the shutter 20 is open or closed Can be detected accurately.

The present invention can reduce the number of parts and reduce the number of parts and weight of the product because the parts disposed inside the cover 16 are the substrate 55, the optical sensor 50 and the motor 40 and the like. The reliability of the product can be enhanced.

1 and 9, a fixing jaw 13 is protruded from the inner circumferential surface of one end of the communication hole 12 into which the duct 70 connected to the ventilator is inserted.

The coupling protrusion 73 formed on the outer circumferential surface of the duct 70 in the state where the duct 70 is inserted into one end of the communication hole 12 is engaged with the fixing protrusion 13 and is separated So that it is maintained in a coupled state.

At least two or more moving grooves 14 are formed in the fixing jaw 13 in the inserting direction of the duct 70 and the engaging protrusions 73 of the duct 70 are engaged with the moving grooves 14 And is inserted into one end of the communication hole 12. [

Hereinafter, the assembly and operation process of the present invention having the above-described configuration will be described.

And the shutter 20 to which the second shaft 33 is fixedly coupled is inserted into the communication hole 12.

At this time, the second shaft 33 is rotatably inserted into the lower portion of the housing 11.

The first shaft 31 penetrating through the through hole 36 of the rotary bar 35 is inserted into the mounting hole 21 of the shutter 20.

By this assembly, the rotary bar 35, the rotary center shaft 30 (the first shaft 31 and the second shaft 33), and the shutter 20 rotate together.

The substrate 55 on which the optical sensor 50 is mounted is disposed on the upper portion of the rotating bar 35 and the motor 40 is disposed thereon.

At this time, the first shaft 31 may be mounted on the motor 40 in advance.

After arranging all the other components except for the cover 16 as above, the cover 16 is assembled.

Specifically, the cover 16 is pushed in such a state that the first latching portion 15 is disposed between the other end of the second latching portion 17 and the inner surface of the cover 16.

The engaging step 15a formed in the first engaging part 15 is inserted into the engaging groove 17a formed at the other end of the second engaging part 17 so as to be coupled as shown in FIG. .

When the electric damper itself is assembled as described above, the duct 70 connected to the ventilator is inserted into one end of the communication hole 12 and connected as shown in FIG.

At this time, the coupling protrusion 73 protrudes from the outer circumferential surface of the duct 70, and the coupling protrusion 73 corresponds to the position of the moving groove 14 as shown in FIG. 9 (a) And the duct 70 is inserted into one end of the communicating hole 12 so that the engaging projection 73 moves along the moving groove 14 as shown in Fig. 9 (b).

At this time, the engaging projection 73 is slightly compressed.

Thereafter, the electric damper is rotated as shown in Fig. 9 (c).

Then, the coupling protrusions 73 formed on the outer circumferential surface of the duct 70 are disposed inside the fixing jaws 13.

At this time, the coupling protrusion 73 is in close contact with the inner circumferential surface of the communication hole 12 and is not rotated arbitrarily. The coupling protrusion 73 is caught by the fixing protrusion 13, (12).

The assembly of the electric damper is completed through the above process.

8 (a), when the first photosensor 51 senses the first wing protrusion 38a, the control unit causes the shutter 20 to close the communication hole 12, .

When the rotation center shaft 30 is rotated by the motor 40, the rotation bar 35 rotates together with the rotation center shaft 30. [

8 (b), when the second optical sensor 52 detects the second wing protrusion 38b by the rotation of the rotation bar 35, the controller controls the shutter 20, It is determined that the communication hole 12 is opened.

As described above, whether the shutter 20 is opened or closed can be more accurately measured by the optical sensor 50 and the rotation bar 35, and reliability degradation due to component fatigue accumulation can be minimized.

The electric damper for a fan according to the present invention is not limited to the above-described embodiment, but can be variously modified and embodied within the scope of the technical idea of the present invention.

The present invention relates to a locking device and a locking device for locking the locking device in a locked state in which the locking device is mounted to the housing. ,
20: shutter, 21: mounting hole, 22: third surface mounting,
The present invention relates to a rotary shaft having a first shaft, a first shaft, a first shaft, a second shaft, a second shaft, a rotating bar, a through hole, 1 wing protrusion, 38b: second wing protrusion,
40: motor,
50: optical sensor, 51: first optical sensor, 52: second optical sensor, 55:
70: duct, 73: engaging projection,

Claims (11)

A case having a communicating hole with both ends opened therein;
A shutter disposed inside the communication hole and opening and closing the communication hole by rotation and equipped with a rotation center shaft;
A motor connected to one end of the rotation center shaft for rotating the rotation center shaft to rotate the shutter;
A rotating bar coupled to one end of the rotation center shaft and rotating together with the rotation center axis and having blade protrusions protruding from an outer circumferential surface thereof;
An optical sensor for detecting a rotation angle of the shutter by detecting rotation of the blade protrusion by rotation of the rotation bar according to rotation of the rotation center shaft;
And a control unit for determining the open / close state of the communication hole according to the rotation angle of the shutter sensed by the optical sensor, and controlling the motor,
Wherein the optical sensor comprises a first optical sensor and a second optical sensor disposed at an angle of 90 degrees, the wing protrusion being composed of a first wing protrusion and a second wing protrusion arranged at an angle of 180 degrees,
Wherein,
Wherein the controller determines that the shutter is closed when the first photosensor senses the first wing projection and determines that the shutter is open when the second photosensor senses the second wing projection,
The rotation center axis,
A first shaft coupled to an upper portion of the shutter and rotatably inserted into the case; And a second shaft coupled to a lower portion of the shutter and rotatably inserted into the case,
A mounting hole for inserting the first shaft is formed on an upper portion of the shutter, a first chamfered portion is formed on an outer circumferential surface of the first shaft,
Wherein a third chamfered portion facing the first chamfered portion is formed in the mounting hole and the rotation center shaft and the shutter are rotated together by the first chamfered portion and the third chamfered portion,
A through hole through which the first shaft passes is formed in the rotation bar, and a second chamfered portion facing the first chamfered portion is formed in the through hole, and the first chamfered portion and the second chamfered portion form the first chamfered portion, The shaft and the rotating bar are rotated together,
In this case,
A housing in which the communication hole having both ends thereof opened is formed, and the motor and the optical sensor are mounted; And a cover coupled to the housing while covering the motor and the optical sensor,
At least two or more first latching portions are formed on the housing, a second latching portion is formed in the cover to hook the first latching portion,
A fixing protrusion is formed on an inner circumferential surface of one end of the communication hole into which the duct is inserted and a coupling protrusion formed on an outer circumferential surface of the duct in a state where the duct is inserted into one end of the communication hole is engaged with the fixing jaw, And an electric damper for a fan. delete delete delete delete delete delete delete The method according to claim 1,
Wherein the second latching part is formed so that one end thereof protrudes from the inner surface of the cover and the other end is bent downwardly and spaced apart from the inner surface of the cover,
Wherein the first latching portion is inserted between the inner surface of the cover and the other end of the second latching portion,
And the engaging jaw protrudes from the first engaging portion in the other direction of the second engaging portion,
And the other end of the second latching portion is formed with a latching groove into which the latching jaw is inserted. delete The method according to claim 1,
Wherein at least two moving grooves are formed in the fixing jaw in the insertion direction of the duct,
And the coupling protrusion of the duct is inserted into the one end of the communication hole along the movement groove.
KR1020150048376A 2015-04-06 2015-04-06 Electric damper for ventilator KR101675418B1 (en)

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Application Number Priority Date Filing Date Title
KR1020150048376A KR101675418B1 (en) 2015-04-06 2015-04-06 Electric damper for ventilator

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Application Number Priority Date Filing Date Title
KR1020150048376A KR101675418B1 (en) 2015-04-06 2015-04-06 Electric damper for ventilator

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KR20160119557A KR20160119557A (en) 2016-10-14
KR101675418B1 true KR101675418B1 (en) 2016-11-22

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20230167921A (en) 2022-06-03 2023-12-12 (주)그렉스 Automatic Opening and Closing Door Structure for Ceiling Air-Outlet without Power

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102020742B1 (en) * 2019-02-15 2019-09-10 윤희주 Damper for exhausting gas

Citations (2)

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Publication number Priority date Publication date Assignee Title
KR100228965B1 (en) * 1997-02-27 1999-11-01 구자홍 Outdoor device of airconditioner
KR200443409Y1 (en) * 2007-05-31 2009-02-10 주식회사 에스 씨디 Apparatus for open/closing damper

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Publication number Priority date Publication date Assignee Title
JP2559080Y2 (en) * 1991-08-27 1998-01-14 株式会社ニフコ Flap opening and closing structure
KR100826275B1 (en) * 2007-04-27 2008-04-30 (주)문명에이스 prefabricated duct flange
KR200467515Y1 (en) 2011-01-20 2013-06-18 주식회사 힘펠 Ventilator with indication lamp
KR200462274Y1 (en) 2011-02-15 2012-09-05 주식회사 힘펠 Ventilator having an motorized damper

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100228965B1 (en) * 1997-02-27 1999-11-01 구자홍 Outdoor device of airconditioner
KR200443409Y1 (en) * 2007-05-31 2009-02-10 주식회사 에스 씨디 Apparatus for open/closing damper

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20230167921A (en) 2022-06-03 2023-12-12 (주)그렉스 Automatic Opening and Closing Door Structure for Ceiling Air-Outlet without Power

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